ML20211N761

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Notification of 860616 Meeting W/Idcor & BWR Owners Group in Bethesda,Md to Discuss Idcor Methodology for Individual Plant Evaluations of Sys Reliability & Containment Performance During Severe Accident Conditions
ML20211N761
Person / Time
Issue date: 06/09/1986
From: Bernero R
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
Shared Package
ML20209E138 List:
References
FOIA-87-10 NUDOCS 8607030237
Download: ML20211N761 (18)
v • d • e


Text

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,f p ae rg I UNITED STATES

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g NUCLEAR REGULATORY COMMISSION WASHINGTON, D C. 20555 ng;x.%, N;r / June 9,1986 o.,,,.

MEMORANDUM FOR: Harold R. Denton, Director Office of Nuclear Reactor Regulation FROM: Robert M. Bernero, Director Division of BWR Licensing

SUBJECT:

BWR MARK I, II AND III CONTAINMENT PERFORMANCE DURING l SEVERE ACCIDENTS PURPOSE: Discuss IDCOR methodology for Individual Plant Evaluations (IPE) of systems reliability and containment performance during severe accident conditions. ,,

DATE/ TIME: June 16, 1986 1:00 p.m. - 5:00 p.m.

LOCATION:

~

Phillips Building Bethesda, Maryland Room P-110 REQUESTED PARTICIPANTS: NRC INDUSTRY R. M. Bernero IDCOR Group Representatives T. Speis BWR Owners' Group Representatives R. W. Houston

. G. Lainas

- J. Zwolinski E. Adensam D. Muller

m. W. Butler A  % _

Robert M. Bernero, Director

- Division of BWR Licensing m

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l6 PP

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- ._ .~ ., __

NRC SEVERE ACCIDENT POLICY

. e FUTURE PLANTS STANDARD CONVENTIONAL REVIEW PRA -

1 e EXISTING PLANTS THEY ARE SAFE EN0 UGH IDCbRPROCESS15'NEEDED INDIVIDUAL PLANT EVALUATIONS GENERIC TREA'TMENT FOR GENERIC MATTERS

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TWO ACTIVITIES e DEVELOPMENT-0F EMERGENCY OPERATING PROCEDURES ,

SCOPE: PREVENTION AND MITIGATION EPG > PGP > E0P NOW ON EPG REV. 4 e IDCOR IPE SCOPE: PREVENTION A11D MITIGATION METHODOLOGY > IPE PROGRAM >IPE METHODOLOGY BEF0,RE NRC e COMMON FACTORS ARE IMPORTANT SCOPE PLANT / EVENT ANALYSIS 3

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.'*- , 3 CONCERNS e E0P WHAT ARE THE E0P STRATEGIES?

WHAT ARE MINIRA TO TRANSFER FROM EPG > PGP > EOP?

ARE REQUIREMENTS CLEAR? _

e IDCOR IPE IS IT AN ASSESSMENT OR AN EVALUATION?

SHAILEACHOWNERENTERTHEIPEWITHABLANKSLATE?

ARE THERE ANY GENERIC SOLUTIONS OR STRATEGIES EVIDENT?

PRIORITIES? ,

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4 I, 4

.6-RECALL WASH-1400 e BWR VS PWR PROBABILITY OF CORE MELT BWR < PWR CONSEQUENCES OF CORE MELT BWR -> PWR e BWR CHARACTERISTICS

-5 BWR-3 ,

2 x 10 TC-y ',TW-7 BWR-2 6 x'10-6 TW-g' e

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. '. 3 A 5 ELEMENT POLICY

1. HYDROGEN
2. SPRAYS _
3. . PRESSURE
4. CORE DEBRIS
5. TRAINING AND PROCEDURES O

..  : 6 ELEMENT 1 - HYDR 0 GEN OBJECTIVE: PREVENT HYDROGEN COMBUSTION CAUSED FAILURE REQUIREMENTS:

A. 0XYGEN CONTROL INERT TO START CONTROL INGRESS OF OXYGEN B. HYDROGEN CONTROL CONTROLLED BURNING EQUIPMENT SURVIVABILITY 4

ISSUES:

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. . . - . . . . , . ,u.. . ,  ; .., .

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1. WHEN AND HOW LONG NOT INERTED i
i. . -- 2. INDEPENDENT POWER FOR IGNITERS l 3. SURVEILLANCE FOR IGNITERS i

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. 7 ELEMENT 2 - SPRAYS OBJECTIVE: -SPRAY WATER T0:

1. LOWER PRESSURE
2. COOL VULNERABLE EQUIPMENT
3. QUENCH DEBRIS
4. SCRUB AEROSOLS REQUIREMENTS:
1. SPRAY IN DRYWELL

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2.
  • BACKUP WATER SOURCES AND PUMPS HOSE CONNECTIONS USE OF FIREMAINS ISSUES: 1 ,. - -. 3 r m, , .- - ,
1. RISK 0F IMPLOSION
2. RISK 0F HYDROGEN COMBUSTION AFTER STEAM CONDENSATION
3. MANUAL ACTIONS AND TIMING e

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8 ELEMENT 3 - PRESSURE OBJECTIVES: 1. AVERT UNCONTROLLED OVERPRESSURE FAILURE

2. CONTROL RELEASE PATH (SCRUBBING)

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Rt0VIREMENTS:

1. SUBSTANTIAL CAPABILITY TO VENT WETWELL
2. REMOTE / RELIABLE CONTROL OF VENT VALVE
3. ABILITY TO RECLOSE VENT

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ISSUES: ,

1. DELIBERATE RELEASE OR RADI0 ACTIVITY
2. WHAT IS REMOTE / RELIABLE CONTROL?

- 3 r IS DUCT BURST IN SECONDARY._ c. 2 CONTAINMENT-ACCEPTABLE?

4. WHAT IS APPROPRIATE ACTION PRESSURE?

i *

-9 ELEMENT I4 - CORE DEBRIS OBJECTIVE: REDUCE LIKELIHOOD OF FAILURE BY DIRECT ATTACK REQUIREMENTS: -

1. USE PRACTICAL DEBRIS RETARDING BARRIERS
2. CONSERVE SUPPRESSION POOL WATER AS A QUENCHING POOL ISSUE: WHAT IS PRACTICAL?

- " ' ' * * *' t g e-D

10 ELEMENT 5 - TRAINING AND PROCEDURES OBJECTIVE: ENSURE OPERATORS ARE READY TO USE PLANT FEATURES TO BEST ADVANTAGE IN SEVERE ACCID 5NTS REQUIREMENTS:

1. CLEAR SYMPTOM BASED STRATEGIES (INTEGRATED)
2. REMOVAL OF UNNECESSARY INHIBITIONS
3. TRAINING / PROCEDURES ISSUES:
1. COMPETING SAFETY REQUIREMENTS
2. DEGREE OF TRAINING

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..- -11 AN INSTITUTIONAL APPROACH

-e GENERIC LETTER - ADVANCED NOTICE OF PROPOSED REQUIREMENTS - TO SOLICIT COMMENT e COLLECTIVE PUBLIC REVIEW s GENERIC LETTER OF REQUIREMENTS e IMPLEMENTATION WITH IPE AND EPG REV. 4 IMPLEMENTATION

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