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268 Cards in this Set
- Front
- Back
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What is the primary and secondary purpose of the RCS system?
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Remove heat from the core and transfer it to the S/G. Provide a barrier to prevent release of fission products. |
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what is the RCS design thermal power?
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2737Mw thermal |
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What is the temperature of the hot leg and cold leg?
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hot: 599.4 cold:548 |
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What is the RCS minimum design Flow rate?
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340,000 GPM |
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What is the nomal RCS operating pressure?
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2250 pis |
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what is the maximum RCS pressure and what happens at that pressure? |
2500 psi and the safety valve lifts |
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what is the heat sink for the RCS system?
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Steam generator |
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what is on the shell side? |
Feed water on shell side |
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what is the purpose of the Primaryand secondary MOISTURE SEPARATORS in the top of the steam generator ?
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make sure moisture doesn't go to turbine |
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what is the purpose of the 2” hot leg drains on the 11(21)Hot Leg? |
provides the connection for RCS level indication during Modes 5, 6 and defueled
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What are the purpose of the Safety Injection headerconnections at each cold leg
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provide the flow from the Safety Injection system, including HPSI, LPSI, SITs and SDC
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what type of o rings on the reactor vessel? what pressure does the alarm sound on the leakoff line
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self inflating and 1850 psig |
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what is primary and secondary pressure of the Rcs?
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2250 and 850
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Purpose of the pressurizer and what is the normal level
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allows expansion and contraction ofcoolant caused by temperature changes. .. 216" |
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purpose of the pressurizer spray system?
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lower rcs pressure by spraying water into the steam space. lowers rest of RCS |
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what does the prx vent valves do?
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remove non condensable gasses the accumulate in the system |
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purpose of the PZR spray CV bypass?
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maintain 500-510 degrees upstream of the spray CV's to ensure thermal stress of the spray. |
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where does the pressurizer main spray flow come from? whats the flow rate?
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11 a/b and 21 a/b cold legs... 357 gpm at 2250 |
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what is the percentage flow rates for RCP operating configurations?
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Need 4 rcps for 100% flow |
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when are pressurizer aux spray used?
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when No RCPS, when main spray is not aviable... used normally during shutdown ... supplied by CVCS charging |
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Purpose of the Prssurizer heaters?
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provide heat tpo raise water temp in PZR to maintain 2250 psig |
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what are the two type of PZR heaters?
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Proportional and Backup |
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what pressure does propotional heaters start and stop?
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Start:2225 |
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what pressure do Backup heaters start and stop?
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Stop-2225 |
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Power supplies for Proportional and Backup heaters
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11/21 Backup 480 11b/21b 12/22 Backup 480 12b/22b 13/23 14b/24b 14/24 13b/23b |
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Whichheaters will you be required to manually shut the breaker after a Loss ofOffsite power?
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11and 13 Backup Heaters trip on Undervoltage, and will require the TBO to manuallycharge the closing spring and close the breaker
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component actions that occur as pressure increases in the PZR
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first you get maximum spray flow tryingto limit pressure increase then Relief Valve opens then Safety Valves open Relief and Safety Valves discharge steamto the Quench Tan |
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where do the PORVs discharge to and when do they open? How many are there?
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Quench tank, 2, Both open at 2400 |
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when do the PZR safety valves open?
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first at 2500, second at 2565... discharge to quench tank |
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how does Pressurizer respond to lowering RCS temp?(process not heater)
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RCS volume contracts, steam volume in PZR expand and lowers, some liquid will flash to steam, PZR heaters entergize, letdown flow decreases. |
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How does PZR respond to RCS temp Increasing?
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Quench tank: where is it located? where does it discharge? what is design pressure of rupture disk? what is added to prevent explosive internal atm?
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Basement of the Containment (10 foot), discharges to RCDT, 100 psig, nitrogen |
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what type of pumps are the RCP's?
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single suction , centrifugal |
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how many seals are on the RCPs
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4... 2250 to 50 psig |
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what cools RCPs?
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counter flow Hx.... component cooling |
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what happens and how much water leaks from the RCP seals?
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1.5 GPM... bleed off to the VCT... fourth seal goes to containment sump |
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Plant conditions.... time to boil with and without vacuum?
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7 hours with vac... 44 hours with no vac
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what will be the oil level in the charging pumps be when its running and when its off? |
Barley visible when its running and should be 1/2 full when charging pump is off |
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what happens in the CVCS system on a SIAS
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Letdownis isolated, bleed off is isolated, charging pumps start, boric acids pumpsstart, boric acid pump recircs shut, boric acid gravity feeds open, chargingpump suctions swap to the BASTs.
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Whatis the purpose of letdown stop valve CVC-515?
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Itcan isolate letdown on a high RHX outlet temp, SAIS or CVCIS signal.
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Whatis the purpose of the CVCS RHX?
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Conservesenergy by transferring heat from Letdown to the Charging System
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What does the CVCS RHX have to protect from pulses from the Charging pumps? |
Impingement Baffel |
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What is normal temperature entering the CVC RHX (let down temp, atCCNPP? |
548
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what has a common containment penetration cooled by component coolingwater?
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Charging and letdown
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What is the purpose of the CVCS?
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In an emergency, Inject boric acid in the RCS upon a sais |
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Ifthe charging pump suction pressure reaches 10 psia what will happen?
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pumps trip |
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at what level in the VCT does the charging pump suction switch to the RWT?
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3" |
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Whatwill shut the CVCS letdown isolation valves?
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470FRHX outlet temp (only CVC-515), SAIS and CVCIS
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CVC-520(IX inlet/bypass valve) will bypass the IXs at what temperature?
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145
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Whatis the purpose of the rad monitor in the cvcs?
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To detect specific isotopes which indicate a fuel failure it also detects gross activity of the RCS. |
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How are the IXs protected from overheating during normaloperations? |
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Howdo we minimize oxygen in the RCS?
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Additionof hydrogen to the VCT.
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Followinga SAIS signal how is controlled bleed off flow maintained?
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Itis diverted to the RC drain tank
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What Happens to dose rate as you increase the number of running charging pumps?
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It Increases. |
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Advantageof two charging pumps over one
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fasterresponse time to chemistry parameter changes.
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Whatis hydrogen used for in the aux building?
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Overpressurein the VCT to scavenge oxygen.
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Whatcan cause gas introduction into the system?
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Acceleration head loss, stabilizer bladder rupture, N2leakage. |
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In SDC purification there is no _____protection for the IXs. |
automatic over temperature
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Whatcould cause the excess flow check valve to shut?
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Downstream pipe break, downstream letdown relief valvelifting. |
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Onedesign function of CVCS is to ?
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Maintain Chemistry
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CVCScomes out of a ___leg and goes into a ___ leg
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cold,cold
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Whatcools letdown flow in the RHX?
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Charging |
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____IX is normally online during operation. _____ IX is used at EOL
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Purification ,Deborating
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Whatcools letdown flow in the L/D HX?
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component cooling
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Whyis letdown flow cooled down below 140F?
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Protect IX resin
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Whatwill automatically close 501 MOV (VCT outlet)?
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3” in VCT and SAIS |
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VCTinlet CV-500 will divert to _____ at a high level in the VCT
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RC waste
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The TRM requires what in the CVCS? |
there to be two boration flow paths available.
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What does the CVCS do in regards with the volume in the RCS?
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provides makeup for leakage, compensate for volume changes caused by density driven br RCS temperature |
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what is the purpose of the Back pressure regulator?
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PreventL/D from flashing to steam due to the throttling effects of the L/D Flow Control Valves Locateddownstream of the Letdown HX on the 27 foot level Aux Bldg
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list the three different types of CVCS IX
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1.Purification
2.De-Boration 3.De-Lithiation |
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ØWhat component of Letdown controls the temperature going into the IonExchangers? |
ØLetdown HX |
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ØWhat are the three subsystem that makeup the CVCS? |
Letdown, Charging, and the Makeup System
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SIT injects first before HPSI, even though it’s at a lower pressure than HPSIs |
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ØRefuelingWater Tank Ø3 HighPressure Safety Injection Pumps Ø2 LowPressure Safety Injection Pumps Ø2 ShutdownCooling Heat Exchangers Ø4 SafetyInjection Tanks Ø2Containment Spray Pumps Ø2Containment Sumps |
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What are the RWT capacity and minimum required volume?
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420,000... 400,000 36 min of injection |
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what height is the overflow level of the RWT?
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469" |
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when does the containment sump supply SI/CS pumps?
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when RWT is empty |
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how many RWT level switches are used to initiate a RAS?
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2 out of 4 logic. could only take one out of service at a time |
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which componenets actuate in SI on a large break? which on a small break?
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large SIT... Small HPSI
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what happens during the 0,5,10,15 seconds after D/G breaker closes
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0-HPSI, LPSI MOV open and SIT valves get open signal(already open only for redundancy) 5-11 and 13 HPSI pumps start 10-LPSI pumps start ( u-2 25 seconds) 15-CS PP's Strt |
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HPSI Pump Purpose and Function?
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Inject borated water for small LOCA, Inject water during recirc mode for extended period of time, fill sits during mode 1 ops |
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What is the HPSI Capacity?
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min flow 30 gpm 1280 shut off head |
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what cools HPSI?
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component cooling. seals bearings and stuffing box jacket seal water |
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why is MOV 656 HPSI. 12?
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It must withstand full RCS pressureand is shut when Charging through the Aux HPSI Header |
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why is there a cross connect between CVCS and SI?
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so Coolant be pumped in either direction: HPSI pumps can supply via charging connections. and charging pumps can inject via HPSI header |
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what providddes the Last chance ability to provide cooling flow to core?
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Once through core cooling... Through PZR PORV to containment floor |
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how does core flush work?
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works backwards from normal SI, injects into PRZ instead of cold leg |
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What are the LPSI capacity?
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3000 gpm @ 130 psi... min flow 40 GPM... colled by component cooling... Shut off head is 180 psi |
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When to LPSI turn off?
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on RAS |
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what happens during RAS signal?
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containment sump and RWT will be cross connected until CR operator manually closes the RWT discharge MOVs |
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why do we want the SI pump recirc Lockout switches ON prior to an RAS?
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Ras requires operator actions |
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Purpose of SI tanks?
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Floor reactor core with borated water following a RCS large break |
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what is the capacity of SI tank?
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2000 ft 3 and pressurized with nitrogen |
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when do SITs discharge?
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when pressure drops below 200 psi |
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Purpose of Containment Spray?
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limit containment atm pressure during Steam line rupture. |
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when does containment spay valves open?
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CSAS |
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why is flow rate higher in containment spray in recirc mode?
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containment pressure is on the suction and discharge ( instead of just discharge)
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what is the prupose of the Sodium tetra borate baskets?
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raising the PH of RCS in sump |
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ESFAS actuated SIAS at what pressure
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2.8 psig |
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What is the purpose of the CRDM
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provides short term reactivity changes and provides emergency shutdown. |
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What is a CEA |
Controll element assemblies
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what is CEDM |
Control element Drive mechanism |
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How Many Shut down groups are there?
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40... 3 groups.....2% shut down margin |
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Why are the SD Group rods withdrawn first and inserted last?
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assure adequate shutdown margin is maintained anytime the reactor is critical
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How many regulating CEA's are there?
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37 CEA's in 5 groups |
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Why are different regulating rod groupswithdrawn or inserted by overlapping the sequence? |
Overlappingrod withdrawal or insertion between the various banks is configured to providethe most uniform change in core reactivity with incremental changes in rodposition
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what do the CEA Motor generator Sets do?
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provide a dependable power supply that can withstand minor voltage fluctuations without tripping |
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How long does it take for the CEA motor to get up to speed
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5 min |
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what is the purpose of the fly wheel on the CEA MG set? |
allow continued power during small power fluctuations |
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where can the CEA MG set be operated from besides the control room? |
on the control panel right by the set. |
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how long could the COntrol elements work if cooling is lost?
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15 min... designed for 650 maintained at 350 degrees |
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what are the location of the CEA MG? |
27 and 45 foot switch gear rooms |
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what supplies the CEA MG set?
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480 non-vital |
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which component is normally inserted to hold CEA?
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upper gripper |
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what does CEDM relay monitor?
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field amps |
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how many breakers open in the CEDM system on reactor trip?
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8
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what CED's are covered in tech specs? |
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what happens if the 8 Breaks do not trip in the CEDM system?
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DSS opens (diverse scram system) |
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what is the normal voltage of the CEDM system ?
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240-245 |
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what is the Tech specs related to the Spent fuel pool?
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Boron Concentration and pool level |
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where is the log for the purification flow located for the SFP?
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across from the batching tank on the 27' |
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Why is the SFP maintained below 100? |
minimizes boraflex degrigation? |
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Who must be present during SFP operation? |
Plant watch supervisor |
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what is the normal discharge pressure of the SFP pumps ? |
105-120 psi |
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what is the concern with the SFP pumps running at 103 psi?
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pump run out |
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why should the discharge of the SFP PP be immediately be open after its started? |
theres no mini flow
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What needs to happen when a valve is changed in regards to the SFP?
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someone needs to monitor level |
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what is used to measure the SFP?
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wet ruler |
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where are the SFP Hx located? |
27' AUX building |
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what is the make up for the SFP?
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DI |
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What cools the SFP HX |
SRW cools
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what powers the 11 and 12 spent fuel pump?
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12-24 bus 480 |
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what needs to happen and what is involved during a complete core offloading?
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Shut down cooling HX is cross connected to the SFP |
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What are the engineered safety feature actuations for the SFP?
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Undervoltage signal the pump will be load shed |
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where does the SFP resin filter go?
|
solid waste processing |
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What is used to clucie resin out of SFP Demineralizer?
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Nitrogen |
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On a RAS signal Mini flow valve 659 and 660 go to the ___ position due to ___?
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Shut position, so contaiminated water is not recirulated back to the RWT and dose up the west road. |
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Wat is the status of the SIT MOV's at 100% power?
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open and deenergized.
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What is the status of the spray ring in containment @ 100% power? |
dry |
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What is the current stauts of Shut down cooling MOV 306 |
open |
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At RCS pressure of high 1600's what is actuating in SI? |
just charging pumps going no hpsi (pressure is too high) |
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where can the HPSI be operated from? |
COntrol room and front of breaker |
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What signals do you need for SI spray to actually initiate? |
CSAC and SIAS |
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What does a RAS signal do in regards to SI?
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Stops LPSI |
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as a plant operator what should you do if a RAS signal Actuates?
|
leave the aux building |
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What are the functions of Shut Down Cooling? |
Fill refuling pool method of boration supplement SFP cooling |
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when are there 2 SFP HX in service? |
beginning of refueling |
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How do we get more cooling for Shut down heat exchangers? |
throttle the outlet valve more open |
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What things are covered under tech specs with SI? |
Level, pressure, boration |
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What is the difference between Aux and main Charging headers? |
Aux could handle more pressure |
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Where is the location of the emergency sump MOV? |
5' Aux building |
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where does the RWT overflow to? |
Misc Waste reciever |
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what heats the RWT? |
Plant heating for heat exchanger |
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Why do we use the Silica Skid?
|
Unit 2 - has boraflex on the fuel racks which forms silica . which must be limited to prevent crud deposits on fuel assemblies |
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What temperature must be matained to minimize silica Release?
|
100 |
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What is used during pump priming of the silica skid? |
DI water |
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how many membranes are there on the silica skid and how are they contected to each other? |
5 in a series-parallel manor |
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What technique is used to remove silica? |
reverse osmosis |
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Where does the Silica skid Withdraw water from and where does it discharge it back? |
withdraws from unit 2 and discharges it back on unit 1
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where does the reject flow in the silica skid go to? |
Misc waste |
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What runs before the feed pump on the silica skid? |
feed boster pump |
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what mode is the silica skid not permited and why? |
6- because it removes boron as well |
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If a major leak occurs in the silica skid what should you do? |
depress one of the emergency stop buttons 5000 |
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what I the power supply for the silica skid? |
480 welding receptical |
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How much boron makes it through the silica skid?
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90% |
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What silences alarm on silica skid?
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F7 |
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WHat is the purpose of the COntainment?
|
provide the 3rd and last Shielding of radioactive material to the environment |
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what strengthens the containment?
|
tendons
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what is design Pressure and temperatores of the containment?
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50 internal, 3 external, 276 degrees |
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where could u access the tendon galleries ?
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outside around containment and 5' of aux building |
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what is used to provide access to tendon inspection above ground containment?
|
sky climber |
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what is the purpose of the COntainment liner?
|
provide as a leakage boudry |
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what is the purpose of cathodic protection
|
use sacrafical material to prevent corosion |
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where does the containment sump divert flow to?
|
ECCS pump room |
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what are the 3 ingresses into containment ?
|
personal air lock 69' , emergency airlock and containment equipment hatch |
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what are the 6 piping penetration classifications
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2-multiple pipe 3-electrical 4-hot pipe 5-fuel transfer tube 6-purge air |
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what is used to seal pip penetrations
|
single pressure barriers |
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what are the 8 Hot pipe penetrations and what is required for them
|
2 main steam 2 main feed water 2 S/g blowdown Rcs letdown RCS PASS sampling |
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How many purge Penetrations per unit?
|
2- 27' penn room with blank flang |
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what are the four electrical penetrations?
|
2- low voltage canester 2E-low voltage stainless steel 3 instrumentation |
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What is used in sealing electrica penetrations?
|
nitrogen |
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what is the purpose of the H2 system?
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when does the hydrogen purge air blower start?
|
5 psig |
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Where is the controller for H2 purge
|
1C100 |
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what is the purpose of the H2 check valves
|
prevents contatinment blowing into the penn room and supply section of the hydrogen purge system |
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where are the H2 purge blowers located |
69' of the can |
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What temperature must the containment vent system be maintained at? |
45. b/c of condensation |
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what is installed in modes 1-4 to make the COntainment vent system inoperable? |
Flang |
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Where is the purge exhaust van? |
5' aux building |
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what are the 3 combinations the provide 100% cooling in the CAN? |
3 CAC's, 2 CS, 1 CS and 2 CAC |
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what cools CAC's |
SRW
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Where to CAC's take suction?
|
on the containment Atm above the coolers |
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what are the location of the CAC's? |
2 on the 69' and 2 on the 45' of the Can |
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What happens to the CAC's on SIAS signal? |
starts CAC's on 1/2 speed to prevent overloading and tripping |
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what are the SRW supply line ups to the CAC's |
12 header -13-14 CAC |
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how many CAC's are running during normal operation ? |
3 |
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Power supply for CAC's ? |
480 vital |
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If you loose 24b 480 v bus, what CAC do you loose? |
24 CAC
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Power supplies for CAC? |
11 CAC - 11A Bus 12 CAC - 11B Bus 13 CAC - 14A Bus 14 CAC - 14B Bus |
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where can Reactor Cavity cooling be started from
|
control room 1c34 |
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WHat are the purpose and location of the Iodine removal units?
|
3 of them
remove iodine dring LOCA and shutdown...69' |
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what containment vent system maintains temp of overall atm during 100% power
|
CAC |
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In the RC waste system at what level does the RC drain tank set off low alarm?
|
10" |
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What intervaces between the RC waste and CVCS |
manual 300 |
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RC waste receiver waste pumps are operated from?
|
1C63 in the -10' of the aux building |
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what condition will stop the RC waste receiver waste pump? |
low level B/c it needs quench volume for let down reliefe |
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why limit discharge 120 gpm of waste to the bay ? |
prevent channeling through the ion exchanger |
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why maintain 140 in an ion exchanger |
prevent ion resin damage |
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what is the capacity of the RC Drain tank and the RC waste tank? |
900 gallons, 90,000 |
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RC drain tank 4260 CV goes shut on ____ signal
|
SIAS |
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Where does the degassifier safety lift valve go to? |
waste gas surge tank
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why is same pump used to discharge waste after it has recirculated?
|
pump line is already flushed |
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how do you operate the degasifier pump ? ( auto , manual) |
both auo and manual
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What is the max and min levels in the MWRT and MWMT?
|
75 in and 10 in |
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at what level does the MWRT and MWMT pump stop?
|
MWRT 5.25 in. .....MWMT 6in. |
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What is the max DP across a Misc. waste ion exchangers? |
17 psid |
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What is the capacity of the MWRT and MWMT?
|
4000 Gallons |
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WHat does the MWRT receive?
|
various locations in the Aux building |
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Which tank receives Soapy fluids?
|
MWMT |
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where does the MWMT over flow to?
|
MWRT and the -10 duplex sump |
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what is the difference between the MWRT pump and the Metering pump?
|
metering pump is used only if the discharge flow is less then 25 gpm
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location of the Outlet strainer in the Misc waste system?
|
27' aux building |
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What goes to the MWRT?
|
Aux building pumped sump header, graity drains
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where does the containment sump normally drain to?
|
graity drains to ECCS pump room sump |
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where does the hot lab and soapy drains , an MPF truck, decon shower align too?
|
MWMT |
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where does graity drain header back up?
|
5' aux building |
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where does soapy drain header back up to? |
27 ft east hallway |
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how many decay tanks can be valved in at a time?
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1 |
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Where is the location of majority of the Waste gas system components? |
5' of the aux building |
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what are two components that ffeed into the containment header in the waste gas system? |
Rc Drain tank and quench tank? |
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What is the location of the waste gas containment header isolation vlave? |
27' west penn room |
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What closes the the Waste gas isolation valve? |
SIAS
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What is the Decay tank pressure limit? |
110 psig |
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What is the discharge filter d/p max in the gas filter? |
8 psig |
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what will close a waste gas discharge valve? |
high rad |
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what is the design feature to not allow both unit vent paths? |
mechanical interlock between flow path |
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what is the correct sequence path in the waste gas system?
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waste gas surge tank compressors decay tank filter rm main vent |
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On source that comes in the Aux Building primatry Header
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VCTs
Degasifier Vacuum Pumps Degasifier Relief Valves RC Waste Evaporators Vacuum Pumps RC Waste Sample Accumulators O2 Gas Analyzer |
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What is the waste gas surge tank pressure?
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1-5 psia |
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Where does the liquid accumulation in the waste gas surge tank go? |
RC degassifier |
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what is the purpose of nitrogen in the sureg tank for the waste gas system? |
vaccume breaker |
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what type of Pump is used in the waste gas system? |
diaphragm |
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What hooks into the secondary header in the waste gas system? |
Spent Resin Metering Tank Boric Acid Storage Tanks RCW Monitoring Tanks Misc Waste Rec & Mon Tk RCW ReceiverTanks |
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Where is the location of most solid waste components?
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45' aux building |
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what is the control panel for the solid waste system?
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1c95 |
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When does the Inlet CV to the Spent resin tank go shut? |
high level and whe test light button is pushed |
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what are the 3 outlet valves on the spent resin tank? |
101,102,115 |
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What is plant air used for in the solid waste system? |
air sparing |
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what level do we keep the resin below in the spent resin tank? |
85" |
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where does the air go to in the spent resin tank? |
waste gas |
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what are the 3 things on the Christmas tree lights (from left to right) |
air/water/ resin |
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what is used to make slurry ? |
DI water |
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what is used to flush in the Solid waste system? |
plant service water |
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What is the parameter that is monitored in the steam supply system? |
boron |
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where is the valve at? |
27' west penn Remote cut off!!!! |
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Where does the Non-sampled fluid goes to in the NSSS?
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VCT |
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Where can PASS Samples be taken and what is the limiting factor? |
Hot leg or LIPSI discharge.. Pressure 200 psig |
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What are the 3 sample point form the RCS in the NSSS? |
Hot leg, PZR vapor, PZR liquid region |
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Where does the PASS samples returned to? |
RC drain tank |
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Purpose of the NSSS Sampling? |
Monitor plant fluids for abnormal out of spec composition chem and radiotop analysis |
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why is H2 sampled in PASS in NSSS? |
explosive and corrosion of metal> clading |
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In the NSSS always treat samples as ___? |
contaminated? |
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What is Component cooling used for in NSSS? |
sample coolers? |
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what is the normal line up for the COntainemtn Isolation valves in NSSS? |
Normally closed but if open will close on SIAS but can be over ridden in |
