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37 Cards in this Set
- Front
- Back
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What are the safety related functions of the Main Steam System? |
1. Provide steam to the TDAFP. 2. Control plant cool down rate during SBO with PORVs. 3. Allow rapid RCS cool down following SGTR. 4. Provide isolation capability following HELB. |
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What two SGs provide steam to the TDAFP? |
2 & 3 |
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What are the non-safety related loads on the MSS? |
1. Main Turbine 2. Main Feedpump Turbines 3. Steam Dump System 4. Heating Steam to Reheaters 5. Aux Steam System 6. Steam Seals (U2 only) |
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What are the two purposes of the venturi flow restrictors coming off the SGs? |
1. Reduce steam flow rate following SLB, reduces cool down rate of the RCS. 2. Contributes to pressure differential in steam flow measurement (SGWLC). |
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What ensures main steam pressure is limited to 110% of design pressure (1085 psig)? |
Main Steam Safety Valves |
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What are the set points of the MS Safeties? |
SV1 (A&B) 1065 psia SV2 (A&B) 1075 psia SV3 1085 psia |
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MRV 213, 223, 233, & 243 prevent _____ and allow____? |
Lifting of the safeties controlled plant cooldown |
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What is the PORV response to a loss of control power or air? |
Fail closed |
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What is the lifting set point of the PORVs? |
1025 psig |
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What 4 ways can the PORVs be operated? |
1. CR 2. Hot shutdown panel 3. Local Control Station a. Remote - air from HSD Panel b. Local - overrides control from CR and HSD Panel. 4. Manually on each valve |
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Each PORV has an upstream manual isolation valve. If this isolation is closed, what action must be taken? |
Enter the LCO for inoperable PORV Rad Monitor. |
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MRV-210, 220, 230, & 240 ensure only one SG will blowdown in a steam line rupture, what are two purposes of the Steam Generator Stop Valves? |
1. Minimize positive reactivity effects of the RCS cool down to prevent fuel damage. 2. Limit containment pressure should the steam line rupture occur inside. |
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What are the three valves associated with the SGSVs that control fast closing? |
One normally open 3-way MMO, two normally closed MRVs (dump valves). |
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What does the neon light out indicated located above the SGSV MRVs? |
No solenoid power. |
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What is the purpose of the SGSV MMO? |
Allows testing of the dump valves by isolating either MRV without tripping the SGSV closed. |
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What happens to the MRV on a loss of control air? |
The MRV fails open, which vents air off the SGSV and closes it. |
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What happens to the SGSV components on a loss of power? |
The solenoid remains de-energized, keeping air to the MRVs. The MRVs remain closed and the SGSV stays open. Fast closure capability is lost. |
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What happens to the SGSV on a loss of hydraulics? |
The SGSV fails as is. |
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What is the purpose of the MRV LOCKOUT position? |
Closes and electrically blocks the dump valve closed. Annunciator 117 alarm comes in. Must take the switch to TRIP/RESET and then to NEUTRAL to reset. |
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What are the conditions that result in a Steam Line Isolation (SLI) signal? |
1. Manual 2. Containment pressure HI HI - 2.8 psig 3. High Steam Line Flow with P-12 (LO LO Tavg) 4. Lo Steam Line Pressure - 500 psi |
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What does the Turbine Bypass Equalizing Header supply? |
1. High Pressure Turbine 2. East and West MFW Pump Turbines 3. East and West Steam Bypass Headers |
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What is the purpose of the main steam system drains? |
Drain piping low points to prevent condensate accumulation, turbine damage, and steam line water hammer. |
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What is the response to a loss of control power or air to the main steam system drains? |
DRV-407, SGSV drains, fail closed - all other MSS air operated drains fail open. |
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What would cause DRV-407 to automatically open? |
Hi level in the SGSV drain pot in AUTO. |
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What would cause the Main Steam Lead, Turbine Bypass Equalizing Header, and Turbine Steam Lead Drains to automatically open? |
Turbine Trip |
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Operability of the TDAFP requires what position of MCM-221 & 231, motor operated valve steam supply valves from the 2 & 3 SGs. |
Both valves must be open. |
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What is the purpose of the TDAFP? |
Ensures the RCS can be cooled down to less than 350 F from normal operating conditions in the event of a total loss of offsite power. |
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What is the purpose of the Steam Dump System? |
Control RCS temperature less than 15% load, cool down, and maintain hot standby. |
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If the Steam Dump System is lost, what option do we have to remove heat from the RCS? |
Use of the SG PORVs to the atmosphere. |
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The Aux. Steam System supplies steam to the following: |
1. Turbine Sealing Steam (U1) 2. SJAE 3. Feed Pumps 4. Plant Heating 5. Aux. Building - Vents & NBAE 6. Chemical Cleaning 7. Hotwell Deaerating (U2) 8. Fire Protection CO2 vaporizers |
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What would happen to the Main Feedwater Pumps on a loss of Aux. Steam? |
Loss of vacuum for the pumps and condenser resulting in a plant trip. |
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What would the condition of the PORVs be following a loss of control air? |
PORVs would be inoperable, however, would still be available via a back up nitrogen supply. |
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CCRP-3 supplies power to what PORV component? |
Rad monitors 1600 (2600) & 1700 (2700) - data is lost following loss of power and battery depletion. |
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CRID-1 and -2 supply what? |
PORV controllers - fail closed on loss of power. |
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Where are the main steam flows (MFC-110, 111, 120, 121, 130, 131, 140, & 141) located? |
Located on each SG restricting orifice. |
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Where are the Main Steam Pressure instruments located (MPPs)? |
On the main steam line from the SG before the PORV. |
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What inputs from the MSS are to the SI signal? |
1. SG differential pressure of 100 psid between 2 SGs - 2 of 3 on any steam line. 2. SG pressure 500 psig and lowering on one SG - 1 of 1 on 2 SGs, manual block with P-12. |
