ML19345C796
| ML19345C796 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 11/13/1980 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML19345C793 | List: |
| References | |
| REF-GTECI-A-09, REF-GTECI-SY, TASK-A-09, TASK-A-9, TASK-OR NUDOCS 8012080373 | |
| Download: ML19345C796 (9) | |
Text
.
ATTACICGIT 2 BIG ROCK POINT PLA'IT Recirculation Pump Trip (RPT)
Effects on ATWS at Big Rock Point (BRP)
Presentation to fiRC Date: Nove=her 13, 1980 (3 - 5 PM)
Location: NRC Headquarters, Bethesda, MD Maryland Bank Building - Roo 6110 A.
Introduction B.
PCS pressurization resulting frc= ATWS a.
FHSR consideration / analysis and revised analysis as provided by CPCo submittal dated July lh, 1980.
b.
Relief valve capability to avoid PCS overpressurization.
2.
Containment pressurization resulting from ATWS a.
Results of analysis for containment pressure resulting from ATWS as affected by RPT.
b.
Results or analysis.or s11cvable containment pressure.
C.
RPT vorth in =itigating consequences of ATWS 1.
Probabilistic Risk Assessment (PRA) findings with respect to RPT.
D.
Su==ary 1.
Consumers Power Company will not install the RPT
=odification as previously planned.
2.
Requested action from NRC is to give an extension on the order to install RPT until the results of the PRA are complete at which time appropriate plant modifications will be proposed to replace RPT.
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- t f-ATWS PCS PRESSURE RESPONSE
- SIX PRIMARY STEAM DRUM SAFETY VALVES - TOTAL CAPACITY 200%
OF NORMAL STEAMING RATE
- PEAK PCS PRESSURE t 1700 PSIA FOR TURBINE TRIP WITHOUT BYPASS ATWS EVENT
- PCS DESIGN PRESSURE IS 1700 PSIA, CODE ALLOWABLE PRESSURE IS 1870 PSIA l
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09/07/80 RETRAN TUROINE TRIP W/0 BYPRSS-W/0 SCRRH 9
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l' ATWS CONTAINMENT RESPONSE WRBINE TRIP W/8YPASS AND W/0 RPT - MINOR CONTAINMENT PRESSURIZATION 1
WRBINE TRIP W/0 BYPASS, W/0 RPT AND W/0 FEEDWATER AVAILABLE -
PEAK CONTAINMENT PRESSURE 4 35 PSIG TURBINE TRIP W/0 BYPASS, W/FEEDWATER AVAILABLE, AND WITH RPT AND POISON INJECTION A'. S MINUTES - PEAK CONTAINMENT PRESSURE = 57.7 PSIG TURBINE TRIP W/0 BYPASS, W/FEEDWATER AVAILABLE, W/ AUTO RPT, W/ POISON INJECTION AT 5 MINUTES - PEAK CONTAINMENT PRESSURE = 25 PSIG I
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SUMMARY
OF PRESENTATION o
ATWS SEQUENCES PRESENT. RISK COMPARABLE TO l
OTHER SEQUENCES AT BRP o
RPT DOES NOT ADVERSELY AFFECT RISK o
RPT DOES NOT SIGNIFICANTLY REDUCE RISK o
OTHER MODIFICATIONS APPEAR TO BE GREATER VALUE i
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v VP - 302 VP - 301 s-4 CV 4050
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,s REACTOR CIRC. PUMP #1 REACTOR CIRC. PUMP #2
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,s LIQUID POISON SYSTEM FLOW DIAGRAM
TIME FOLLOWING VARIOUS TRANSIENTS AVAILABLE TO BEGIN LPS INJECTION (SEC) y
+.
INITIAL / FINAL POWER LOW LEVEL HI PRESSURE HI PRESSURE FW (MWT)
TRANSIENT [1.0' NOFW[0.2]
FROM HOTWEll 0'2'
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PREVENT PREVENT PREVENT RDS RECRIT RDS RECRIT RDS RECRIT 240/120 AUTO RCPT 155 218 364 464 NO RCPT 144 144 267
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[.041TURBINETRIP TRANSIENTS *
[.40] TURBINE TRIP [.004b, LOSP
[.10] IPR FAILURE LOAD REJECT
[.01] IPR FAILURE
[.06] BYPASS OPEN (N0 BYPASS)
(N0 BYPASS)
.10 LOSP 5063MAINCOND. FAIL
.10 LOSS AUX. POWER r.06)~MSIVCLOSURE
[.06[LOSSFW (WITH BYPASS)
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[.04 LOAD REJECT i
[.403 LOAD REJECT (FW MANUAL RESTART) j (ALL WITil BYPASS) l
- NUMBERS IN BRACKETS INDICATE FREQUENCY OF OCCURRENCE OF THAT PARTICllLAR TRANSIENT PER YEAR
EFFECTIVENESS OF PROPOSED MODIFICATIONS ON ATWS-CORE DAMAGE PROBABILITY AS IS AUTO RCPT AUTO SLC LIMITED FW 5.0 x 10-5 4.7 x 10-5 4.7 x 10-5 1.6 x 10-5 4.7 x 10-5 1.1 x 10-5 AUTO RCPT 1.3 x 10-5 AUTO SLC FW (LIMITED) 1.1 x 10-5 9 AUTO SLC &
(_ AUTO RCPT i
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