ML20030B847
| ML20030B847 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/10/1981 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| Shared Package | |
| ML20030B846 | List: |
| References | |
| REF-10CFR9.7 NUDOCS 8108240437 | |
| Download: ML20030B847 (14) | |
Text
T DIABLO CANYON COMMISSION BRIEFING (fl0N-CONTESTED MATTERS)
AucuST 10, 1981
% GEN"A e
PLANT DESCRIPTION l
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fl0N-TMI MATTERS e
TMI MATTERS e
IE STATUS PIPORT e
SALP e
LICENSE CONDITIONS ogsggg7stoeti PT9.7 PDR.
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4 GENERAL PLANT DESCP.IPTION e
'!ESTINGHOUSE P!4R - 4 LOOP e
REINFORCED CONCRETE STEEL LINED CONTAIN!!ENT e
CONSTRUCTION PERMIT ISSUED UNIT 1 - APRIL 23,1968 UNIT 2 - DECEMBER 9,~1970 e
APPLICATION FOR OPERATING LICENSE DOCKETED - OCTOBER 2, 1973 e
CONSTRUCTION STATUS UNIT 1 - COMPLETE UNIT 2 - SECOND QUARTER 1982 l
L0li POWER HEARING COMPLETED - MAY 22 1981 e
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NON-TMI MATTERS e
FIRE PROTECTION FI!!AL DESIGN REVIE4 COMPLETE
- APPENDIX R BACKFIT ITEMS 1.
III.G.
FIRE PROTECTION OF SAFE SHUTDOHN 2.
III.J.
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OIL COLLECTION SYSTEM FOR REACTOR COOLANT PUMP e
EXEMPTIONFP.0M10CFRSAPPENDICESGlH&J e
BREAKNATER e
MASONRY '4 ALLS e
OTHER SELECTED ISSUES 1
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- DIABLO CANYO!! SYSTEMS IflTERACTION PROGRAM FOR SEISMICALLY-INDUCED EVE:lTS 7
BACKGROUND e
DBJECTIVE:
FOR POSTULATED SEISMI; EVENTS UP TO THE SAFE SHUTDOWb EARTHQUAKE (7,5t1), ESTABLISH REASONABLE ASSURANCE THAT SEISMICALLY-INDUCED FAILURES OF NON-S AFETY RELA,TED STRUCTURES, SYSTEMS OR COMPONENTS WILL NOT CAUSEJ ADVERSE PHYSICAL INTERACTIONS WITH S AFETY-RE, LATED STRUCTURES, SYSTEMS OR COMPONENTS,
e CONCERN EXPRESSED AT Ifll-2 ACCIDENT IMPLICATIONS ACRS SuaCcMMITTiE MTG. IN Il0VEh3ER 1973 (BASED ON HIGH SEISMIC RISK SITE & LONG-TERM
'!. LESSONS LEARNED" CONCERN REGARDING NON-S AFETY/ SAFETY ADVERSE INTERACTIONS) e. REQUIREMENT SU3SEQUENTLY DOCUMENTED IN IASK ll.C.3 0F NRC ACTION PLAN,tiUREG-0660 e
NUREG-0530 REQUIRED UTILITY'S STUDIES TO BE COMPLETED PRIOR TO FULL-POWER OPERATION, e
NRC STAFF EVALUATION (ABOUT 4-5 MOs, & 1 PfiY) COMPLETED IN' OCTO3ER 1980 (3UPP, 11 TO flVREG-0675); FAVORABLE ACi'.S t.ETTER ISSUED IIOVEMBER 12, 1900, l
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DIA3LO CAtlYON SYSTEriS INTERACTION PP.0GRA!1 FDP. SEISt11CALLY-It!DUCED EVEtlTS HIG:lLIG:lTS e
PG&E'S APPROACH:
NALKDOWN lilSPECTION METHOD
- lilTERDISCIPLIN ARY, TEAM (10-15 PEOPLE)
IDENTIFICATION OF SAFETY-RELATED (TARGETS) AND NO"-S AFETY RELATED (SOURCES)
- EXISTIl4G PLANT FIRE ZONES USED AS C011VENIENT SPATI AL SUBDIVISION
- CRITERI A MAINTAlllED" SAFETY-SYSTEM REDUNDANCY IllTEGRITY
- POSTULATION & EVALUATION OF INTERACTIONS
- Il4 FORMATION RETRIEVAL SYSTEM
- 0/A AUDIT & INDEPENDE!4T REVIEW BY OUTSIDE. 5 MEM3ER BOARD.
9 STNFF'S REVIEW
- NRR 4 MEM3ER TEAM WITH LLL REPRESENTAT,IVE
- lil-HOUSE REVIEW OF PG&E PROGRAM
- OH-SITE.AUD,IT.
t INTERACTION P.ESULTS
- OvsR 850 IrlTERACTIONS POSTULATED AS OF 10/80
- 257. (217) 0F TOTAL NEEDED PLANT MODIFICATIONS; OTHERS FOUND ACCEPTABLE BY ANALYSIS OR INSPECTION-
- DOMINAffT SOURCEO WERE STRUCTURES, P,IPES At1D ELECTRICAL FIXTURES (flEARLY 80E. OF TOTAL)
- NO SERIOUS MODIFICATION PROBLEMS
- PG&E ESTIMATED COST OF ABOUT $5 MILLION FOR THE STUDY OF 30TH DI A3LO CANYON UNITS.
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o DIABLO CANYON SYSTEMS INTERACTION PROGRAM i
FOR SEISMICALLY-INDL'CED EVEtlTS SAMPLES.0F INTERACTIONS IDENTIFIED It! STUDY INTEhACTION SOURCE CATEGORY E IARGET IiODI FI CATI ON LATERAL MOVEMENT OF STAIRCASE OR RAIL NOTCH STAIRCASE
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STRUCTcRES HITTINC PIPES MOVEMENT - PIPES &
PIPES OR HANGER 3 RACE PIPE OR PIPE SUPPOPTS ASSEM3 LIES HITTING SHIELD TARGET RESTRAINED LINE lIANGING & SWINGING CHAIN HOIST HITTING MOVE OR RESTRICT ITEMS CHARGING PUMP PLACEMENT OF HOIST FALLING 03JECTS 3ATTERY-OPERATED LIGHT
. SUPPORT OR MOVE FALLING ONTO PANEL LIGHT AIR SYSTEM DUCTS OR DUCT MOVEMENT CRIMPING KESTRICT DUCT AND/
S UPP ORTS EXPOSED CONTROL OR OR PROTECT LINE SENSING LINE UVERTURNING O3JECTS IANK HITTING MICROWAVE RdLOCATE TOWER COMMUNICATIONS TOWER ELECTRICAL ITEMS FALLING LIGHT FIXTURES IMPROVE SUPPORTS OR NON-CATEGORY /
RACEWAYS IMP ACTING OTHER COMPONENTS v
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7 TMF MATTERS e
CONTROL R00ft REVIEI CONTROL DISPLAYS ARE FU!!CTIONALLY GROUPED AND I!!TEGPATED
- DEMARCATION LINES SEPAPATE FUNCTI0flALLY RELATED CONTROLS AND DISPLAYS ALAP.M DISPLA.YS l!.?!E EXCELLENT VISIBILITY AND ARE READABLE FR0f1 BEHIND MAlf! CONTROL CONSOLE TWO UtlIT CONTROL ROOM - LARGE OPEPATING SPACE /L0ff NOISE LEVEL e
STAFFIllG SHIFT CREI COMPOSITION LICENSED OPEPATORS SHIFT TECHNICAL ADVISOR l
e OTHER NUREG-0737 ITEMS l
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i DIABLO CANYON u
SHIFT STAFFING - 4 SHIFTS-y
'l REQUIRED iWAILABLE 82 MODES MODES TODAY OCT 81 1,2,3,4 5,6 ll SS(SRO)1 8
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l DIABLO CANYON LICENSE EXAM RESULTS FEB-MAR 1981 SR0 FAIL' T
SR0 CANDIDATES PASSED PASS R0 FAILED 23 13 5
'5 (56%)
(22%)
(22%)
12 8
4 (67%)
(33%)
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UIABEU lW/?NYUN SHIFT SR0 SHIFT FOREMAN 3
SR CONTROL OPERATOR j)
SR CONTROL OPERATOR CONTROL OPERATOR
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OPERATIONS SUPERVISOR c
f SR POWER PRODUCTION ENGINEER
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QUALITY CONTROL ENGINEER 4
j ASSISTANT TRAINING COORDINATOR NON-SHIFT SRO l
i PLANT SUPERINTENDENT TECH ASSISTANT TO PLANT SUPERVISOR PLANT ENGIN[1R i
TRAINING C0ORDINATOR i
i ASSISTANT TRAINING C0ORDINATOR e
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REVIEW METHOD EMERGENCY OPERATING PROCEDURES 1.
DETAILED AUDIT OF SELECTED PROCEDURES INADEQUATE CORE COOLING
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SMALL BREAK LOSS OF COOLANT ACCIDENT STEAf1 GENERATOR TUBE FAILURE LOSS OF MAIN FEEDWATER ANTICIPATED TRANSIENTS WITHOUT SCRAM 1.1 DESK REVIEW BY NRC PROCEDURES CONSISTENT WITH GUIDELINES PROCEDURES CONSISTENT WITH DESIGN 1.2 SIMULATOR EXERCISE INCLUDES SEQUENCES WITH ADDITIONAL FAILURES 1.3 CONTROL ROOM WALK-THROUGH
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MORE REALISTIC OPERATING CREW ACTIVITIES ONE PROCEDURE 2.
APPLICANT REVISES ALL OTHER PROCEDURES
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DIABLO CANYON MAN 51 NTE ABI! hCCIDstlTS SIMULATED k
TURBINE TRIP RESULTING IN SCRAM LOSS 0F FEEDWATER INCLUDING CONSEQUENTIAL FAILURES LARGE AND SMALL LOSS OF COOLANT ACCIDENT INCLUDING FAILURE OF SG I ECCS COMPONENTS REC 0VERY FROM INADEQUATE CORE C0OLING STEAM GENERATOR PIPE LEAK AND RUPTURE WITH AND WITHOUT OFFSITE POWER AVAILABLE LOSS OF 0FFSITE POWER ALSO WITH FAILURE OF ONE DIESEL GENERATOR FAILURE OF SCRAM BREAKERS TO OPEN I
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DIABLO CANYON REVIEW 0F AUXILIARY FEEDWATER SYSTEM 1.
ORIGINAL REVIEW IN EARLY 70s JUDGED AGAINST PREVAILING STANDARDS 0
APPROVED WITH NO SIGNIFICANT CHANGES 2.
POST-TMI RE-EVALUATION PERFORM SYSTEM RELIABILITY ANALYSIS REVIEW AFW AGAINST COMBINED RECOMMENDATIONS OF B&O AND LL TASK FORCES APPLY SRP 10.4.9 CHECK AFW SYSTEM FLOWRATE DESIGN BASIS OUTCOME:
REVISED PROCEDURES AND TECHNICAL SPECIFICATIONS HARDWARE CHANGE BASED ON DOMINANT CONTRIBUTOR TO UNRELIABILITY
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