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23 Cards in this Set
- Front
- Back
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To pump water into the reactor following a LARGE break in the primary system that results in a low reactor water level and depressurization of the reactor vessel.
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LPCS
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State the LPCS inititiation signals
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a) Level 1 (-143”)
b) Hi Drywell Pressure (1.68 psid) c) Manual Initiation Pushbutton |
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a) The _____ (el. 70’ AUX BLDG. West Side) draws water from the Suppression Pool and discharges through an injection valve to inside the reactor core shroud to spray header above the fuel. The LPCS spray header is located directly below the HPCS spray header above the top guide of the core.
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LPCS pump
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a) The LPCS pump (el. 70’ AUX BLDG. West Side) draws water from the _______ and discharges through an injection valve to inside the reactor core shroud to spray header above the fuel. The LPCS spray header is located directly below the HPCS spray header above the top guide of the core.
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Suppression Pool
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D. Describe the LPCS Injection Valve operation (4)
a) AUTO OPENS when: |
Control switch in AUTO
Valve not in manual override condition LPCS initiation signal is present Reactor pressure is less than 487 psig |
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Does LPCS valve auto close
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NO
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E. State the LPCS Pump power supply (5)
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a) ENS-SWG1A (4160 VAC)
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Describe the LPCS/RHR’A” line fill systems
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a) Purpose
Minimize injection time by keeping discharge lines filled Minimize the potential for water hammer on pump start Take suction on ECCS suction piping Minimum flow line provided to prevent pump overheating LPCS/RHR ’A’ line fill pump located in LPCS Pump Room (el. 70’ AUX BLDG. West Side) Rated at 50 gpm and powered from same division as they serve |
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The purpose of ____ is to maintain reactor water level above the top of active fuel following a small break (1” or less) in the primary system that does not depressurize the reactor vessel.
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HPCS
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State the HPCS initiation signals.
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a. Level 2 (-43”) or High Drywell pressure 1.68 psid
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a. The HPCS pump (el. 70’ AUX. BLDG. – East Side) draws water from ______. It discharges through an injection valve to inside the reactor core shroud to a spray header above the fuel.
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either the CST or the Suppression Pool
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Describe the HPCS suction valves operation.(4)
a. The HPCS System has two suction valves: one from the CST and one from the Suppression Pool. HPCS is normally lined up to the ____, but if low CST level exist or if the Suppression Pool has high level, the CST suction valve will shut automatically after the Suppression Pool suction valves opens |
CST
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State the HPCS pump power supplies.
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HPCS – Div. III 4160 Vac Bus (E22*S004)
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Describe the HPCS injection valve operation.(6)
The HPCS injection valve will open on automatic initiation of the system and go shut when reactor water level reaches____. It will reopen at____ if no operator action is taken. If the injection valve is manually over ridden it will remain closed (may be manually opened) until the initiation signal is clear and the initiation is reset (reset pushbutton depressed). |
Level 8 (+51”)
Level 2 (-43”) |
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The ____ System is designed to provide the ability to raise plant efficiency by 10% during normal full power operation
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Feedwater Heating and Drains
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The Feedwater Heating and Drains System utilizes various sources of high energy steam and water to preheat the water passing through the ____
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Condensate and Feedwater Systems.
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The ____ directs water from the main condenser hotwell to the suction of the reactor feed pumps.
The water is filtered and demineralized and has some preheating prior to entering the feed heating system. The _____ also acts as a source of water for various plant systems. |
Condensate System
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a) MAIN CONDENSER, including:
(1) The value of the hotwell holdup time. (2) The reason for the holdup time. • It is a two-shell, tube type, single pass, divided waterbox, cross flow type heat exchanger. • ___ delay time at 100% power (about 83,800 gallons of water). • Designed to allow a large portion of the short-lived radioactive isotopes to decay. _____ gammas are the major concern. • Allowing this delay time directly reduces turbine building radiation levels from the condensate system piping and components. |
5 minute
Nitrogen-16 |
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b) CONDENSATE PUMPS
• 3 motor driven centrifugal pumps located at the south end of the turbine building basement (67’ elev) near the TPCCW (CCS) pumps. • 50% capacity pumps rated at 9505 gpm @ 518 psig • Normally _____ pumps operate during full power operation to ensure adequate suction pressure to the feed pumps. |
3
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The _____ provides the means for
the operator to select and move control rods. Control rod positions will be changed during plant startup and shutdown and during plant operations below approximately 55% power. Control rods will be manipulated in a designated pattern to minimize flux peaking in the core, and thus maximize the efficient use of fuel. |
Rod Control and Information System (RC&IS)
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Identify 6 components or conditions that can cause RC&IS to issue a
Rod Block command. |
a) Rod Pattern Controller
b) Rod Withdrawal Limiter c) Neutron Monitors d) High SRAM discharge Volume water level e) Refueling platform position f) Mode Switch position |
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The purpose of the_____ is to provide a means of adding make-up water to the Reactor Vessel to maintain water level.
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Reactor Feedwater System
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B. State the design basis of the Feedwater System. (2)
a)To provide water from the ____ to the reactor at sufficient pressure and flow to maintain reactor water level during plant operation. b)To provide a means of preheating the feedwater. c)To provide a means of system cleanup during plant startup. |
condensate system
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