ML19323H136
| ML19323H136 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 05/21/1980 |
| From: | Mccandless R GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19323H130 | List: |
| References | |
| NUDOCS 8006120127 | |
| Download: ML19323H136 (13) | |
Text
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LIMERICK PRELIMINARY RISK ASSESSMENT
- TECHNICAL PROGRAM DESCRIPTION i
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PRESENTED IO U.S. NUCLEAR REGULATORY COMMISSION MAY 21, 1980 soosiso lat
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LIMERICK PRELIMINARY RISK ASSESEMENT OBJECTIVES I
STUDY RESULTS AND PRESENTATION TO NRC PER MAY 6,1980, LETTER TEXT ANALYSIS R8SULTS SIMILAR TO INDIAN POINT AND ZION STUDY RESULTS d
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LIMERICK PRELIMINARY RISK ASSESSMENT APPROACH e START WITH WASH 1400 REFEh?NCE Bhh (PEACH BOTTOM)
I e IDENTIFY LIMERICK DESIGN DIFFERENCES e UPDATE WASH 1400 EVEN,T/ FAULT IREES AND CONSEQUENCE ANALYSIS TO ACCOUNT'FOR LIMERICK DESIGN DIFFERENCES e COMPARE PROBABILITY RISK CURVES WASH 1400 REFERENCE BWR WASH 1400 REFERENCE BWR AT LIMERICK SITE - -
LIMERICK AT LIMERICK SITE s..
ExeECTeo OuTeur 5 0F PRELIMINARY RISK ASSESSMENT WASH 1400 AT LIMERICK SITE WASH 1400 PROBABILITY LIMERICK AT ITS SITE (THIS STUDY)
RISK
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LIMERICK PRELIMINARY RISK ASSESSMENT NORK SEQUENCE START WORK MEET WITH NRC TASK 1 IDENTIFY DESIGN. DIFFERENCES
- TASK 2 IDENTIFY AND ANALYZE ACCIDENT SEQUENCES TASK 3 DEVELOP AND APPLY CONSEQUENCE MODEL TASK 4 PREPARE
SUMMARY
PRESENTATION TASK 5 REVIEW AND VERIFY
SUMMARY
PRESENTATION TO PECO TASK 6 .
REVISE AND ISSUE REPORT 9
TABLE 1 ,
EXAMPLES OF DESIGN DIFFERENCES BETWEEN LIMERICK AND THE WASH 1400 REFER NCE BWR e MARK ll CONTAINMENT NO TORUS HIGHER FREE CONTAINMENT VOLUME LESS COMPLEX GEOMETRY LESS SEVERE POOL SWELL LOADS e LARGER STANDBY LIQUID CONTROL IANK VOLUME e HIGHER HIGH PRESSURE COOLANT INJECTION FL0n e LOWER REACTOR CORE ISOLATION COOLING MAXIMUM EXHAUST PRESSURE e F0uR (vs. TWO) INDIVIDUAL LOW PRESSURE COOLANT INJECTION POINTS e F0uR EMERGENCY CORE COOLING SYSTEM ELECTRICAL DIVISIONS WITH DEDICATED DIESELS e HIGH PRESSURE COOLANT INJECTION INTO CORE SPRAY SPARGER e MORE REACTOR WATER CLEANUP SYSTEM PUMPS e MORE SAFETY / RELIEF VALVES (14 VS. 11) WITH NEW TOP WORKS AND NO SPRING SAFETIES
, TABLE 1 (CONTINUED) e PIPING MATERIAL CHANGES CORE SPRAY PIPING (316L VS 304)
RECIRCULATION PIPING (316 VS. 304)
LPCI/HEADSPRAY PIPING (316L VS. 304) 4 DRAIN LINE PIPES (316L vs. 304) e ANALOG IRANSMITTER IRIP UNITS e NEW FEEDWATER N0ZZLE AND SPARGER DESIGN e
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LIMERICKPRELIMINARYRISKASSESSMENT
}DEfRIFY DOMINANT ACCIDENT SEQUENCES e IENTIFY INITIATING EVENTS STARTING WITH WASH E00 e CmSTRuCT EVEtU IREES TO DEPICT SUCCESS / FAILURE TO HOT SHlRDOWN e UPDATE SYSTEM FAULT TREES,FOR EA W SEQUENCE e ANALYZE SEQUENm PROBABILITIES INCLUDiC[DUETOINSTRUMENTMISCALIBRATION INCLUDES Cf DUE TO ELECTRICAL /INSTRUNNTATION Cott0NALITY EXCLUES Of DUE TO OPERATOR ACTION EXCLUDES Of DUE TO EARm0uAKE/ FIRE /SAB0TAE e GROUP ACCImf6 SEQUENCES IfRO CONSEQUENCE CATEGORIES l
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, CMF = COMMON MODE FAILURE
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l LIff7.ICK PRELIMINARY RISK ASSESSMENT MARK ll CONTAINMENT ANALYSIS e ASSESSASSlPPTIONSUSEDINl'IASH1E e IDENTIFYDESIGNDIFFERnNCES e ANALYZESPECIFICCASESASIEEDED OVERPRESSWE FAILURE lbDE STEAM BCPLOSIm POTENTIAL DIAPHRACM FLOOR EFFECTS PEDESTAL DESim DWNCONRARRANGENNT e ASSIm PROBABILITIES TO FAI!URE MODES FOR POSTUL.ATED COREDISRLPTIVEACCIDENT -
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LIMERICK PRELIMINARY RISK ASSESSMENT
- DEVELOP PuwT UNiouE CONSEQUENE EDDEL 1
e ibDIFY CRAC INPUT.TO INCLUDE:
e SITE SPECIFIC WEAmER (HOURLY) e SITE POPULATION DENSITY e PLANTFISSIONPR0auCTINVENTORY e AnoTOCRACANALYSIS:
e EVACUATION PLANS / EFFECTS' l
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