Term
SRV
Describe the SRV purpose. |
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Definition
| Designed to maintain Rx pressure below the ASME code limit of 110% of vessel design pressure (110% x 1250psig = 1375psig). |
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Term
SRV
Describe the SRV self actuation setpoint. |
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Definition
-1109psig +/- 1%.
-30psig blowdown to 1079psig. |
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Term
SRV
Describe an SRV being open affect on the Rx. |
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Definition
-2 bore sizes for the SRVs.
-Rated at approx. 800,000lbm/hr each.
-1 SRV open drops Rx level at 20"/min. |
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Term
SRV
Describe the bellows high pressure. |
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Definition
-5 psig.
-Renders safety function inoperable. |
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Term
SRV
Describe the tailpipe alarm setpoint. |
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Definition
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Term
SRV
Describe the concern from pilot leakage. |
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Definition
| Could cause a spurious lift of an SRV. |
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Term
SRV
Describe the pneumatic supply to SRVs. |
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Definition
-All normally supplied by instrument N2.
-All non-safety B/U is instrument air.
-SRVs A,B,E safety B/U is 'A' Alt N2.
-SRVs C,F,H safety B/U is 'B' Alt N2.
-SRVs D,G safety B/U is accumulators. |
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Term
SRV
Describe which SRVs are on which MSLs. |
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Definition
-A has A and E.
-B has G and B.
-C has H and C.
-D has D and F.
All good heavy dogs eat big chewy frogs for inboard outboard. |
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Term
SRV
Describe the ADS initiation signals. |
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Definition
-Low low Rx level of -47".
-A/C interlock met (100# on discharge of ECCS pump).
-107 second timer timed out.
-These are and statement. |
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Term
SRV
Describe the operation of ADS for different signals. |
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Definition
-Timer resets if water level rises above -47" while timer is running.
-Once timer has runout, ADS seals in.
-Inhibit switches stop ADS anytime.
-Loss of the A/C interlock stops ADS anytime. |
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Term
SRV
Describe which SRVs are on ADS. |
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Definition
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Term
SRV
Describe which SRVs are on lo lo set. |
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Definition
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Term
SRV
Describe ADS logic power. |
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Definition
-Bus A: 125Vdc D-11 Ckt 10.
-Bus B: 125Vdc D-21 Ckt 12 (Bus A is b/u). |
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Term
SRV
Describe SRV solenoid power. |
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Definition
-Bus A: D-11.
-Bus B is backup: D-21. |
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Term
SRV
Describe the purpose of lo lo set. |
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Definition
| Help prevent water from climbing up the SRV tail pipe and protecting primary containment. |
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Term
SRV
Describe the lo lo set initiation signal. |
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Definition
-Full SCRAM signal from both:
-Div 1 A: backup scram valve energized.
-Div 2 A & B: SDV vent and drain pilot valves de-energized.
-Lo lo set in AUTO. |
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Term
SRV
Describe the effect of resetting a SCRAM on lo lo set. |
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Definition
| -Ability to use lo lo set is lost. |
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Term
SRV
Describe the lo lo set SRV setpoints. |
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Definition
-H: 1052#.
-G: 1062#.
-E: 1072#.
-All have a 80# blowdown. |
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Term
SRV
Describe lo lo set after a SRV has lifted. |
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Definition
-Prevents reopening for any reason (except mechanical lift) for 10 seconds to ensure discharge line water leg clears.
-Limits thermal hydraulics. |
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Term
SRV
Describe how to tell if an SRV is open. |
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Definition
| -Signal of open w/ 30psid between drywell and tailpipe. |
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Term
SRV
Describe the indication lights for SRVs. |
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Definition
-Green indicates solenoid valve is de-energized.
-Amber indicates that 30psid exists in tailpipe.
-Red indicates power supplied to solenoid. |
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Term
SRV
Describe where SRVs can be operated from. |
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Definition
-A through D (A,C,D are ADS) can only be operated from C-03.
-A,C,D have OPEN and AUTO positions.
-B has OPEN and CLOSED positions.
-E,F,G,H (E,G,H are lo lo set) can be operated from C-03, C253-D and ASDS.
-E,G,H have AUTO, OPEN and CLOSED on C-03 and ASDS.
-E,G,H have AUTO and CLOSED only on C253-D.
-F has CLOSE and OPEN only on all 3 panels. |
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Term
SRV
Describe how many solenoids on each SRV. |
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Definition
-A through D have 1 solenoid each.
-E through H have 2 solenoids each. |
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