ML20214G062

Review of PRA for Seabrook Nuclear Power Plant, Monthly Highlights for Jan 1985

ML20214G062
Person / Time
Site:	Seabrook, 05000000
Issue date:	02/19/1985
From:	Kato W BROOKHAVEN NATIONAL LABORATORY
To:	Lyon W Office of Nuclear Reactor Regulation
Shared Package
ML20213E815	List: ML20213E811 ML20214F446 ML20214F510 ML20214F578 ML20214F595 ML20214F603 ML20214F654 ML20214F699 ML20214F736 ML20214F755 ML20214F766 ML20214F817 ML20214G041 ML20214G057 ML20214G062 ML20214G065 ML20214G068 ML20214G079 ML20214G123 ML20214G128 ML20214G148 ML20214G171 ML20214G179 ML20214G181 ML20214G188 ML20214G192 ML20214G204
References
CON-FIN-A-3778, FOIA-87-6 NUDOCS 8705260399
Download: ML20214G062 (5)

Text

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BROOKHAVEN NATIONAL LABORATORY mL _.j a . .l ,!

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ASSOCIATED UNIVERSITIES, INC.

..: s.J .J Upton. Long Island. New York 11973 (516) 282 . 2444 Department of Nuclear Energy FTS 666' February, 19, 1985 Mr. Warren Lyon Reactor Systems Branch Division of Systems Integration Office of Nuclear Reactor Regulation Mail Stop P-ll32 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Lyon:

Enclosed is the January monthly report for the activities sponsored by your Branch. Also included are the computtrized budget summaries and the fee recovery cost status for each program. I would suggest that you and your staff review the reports to determine whether there are any discrepr.ncies.

If there are, please notify the principal investigator.

We hope this meets with your approval. If there are any questions re-garding format, distribution, or budget reporting, please contact Mr. A. J.

Weiss, Administrative Technical Assistant, FTS 666-4473.

Sincerely yours, Walter Y Kato Deput ' hairman WYK/jw Enclosures cc: R. Bari, BNL S. M. Boyd, NRC W. Houston, NRC M. Kaltman, NRCk' THIS COPY FOR J. Rosenthal, NRC B. Sheron, NRC A. J. Weiss, BNL BNL Technical Monitors 8705260399 870515 PDR FOIA PDR SHOLLYB7-6

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t MONTHLY HIGHLIGHTS FOR JANUARY 1985

" Review of the Probabilistic Risk Assessment for the Seabrook Nuclear Power Plant" (FINA-3778)

(Page 1 of 2)

BNL Principal Investigators: M. Khatib-Rahbar (FTS 666-2626)

W. T. Pratt (FTS 666-2630)

NRC Project Manager: W. Lyon (FTS 492-9405), RS Branch-

1. Scope /

Purpose:

This project is to provide technical support to the Reactor Systems Branch in reviewing the accuracy and completeness of the Seabrook Proba-bilistic Safety Study (SPSS). BNL will perform a critical review of the plant design and PRA methods supplemented by audit calculations of selec-ted accident sequences to confirm the validity of the methods and results.

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2. Work Performed During Period:

The preliminary report was completed and submitted to the NRC Project Manager. Included in the report are assessments of the containment fail-ure modes, radiological source terms, and release characteristics.

A review of tne containment leakage behavior and subsequent impact on ra-diological release category characteristics seems to indicate that the leak-before-gross failure hypothesis does not influence the risk dominant containment failure mode, namely the late overpressure failure mode.

! Therefore, it appears that the leak-before-gross failure approach does little to change the potential for the late overpressurization mode of-containment.

3. Problems / Delays:

The transmittal date for the preliminary report (refer to Item 2) was de-layed because of higher priority given by the NRC to FIN A-3805.

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" Review of the Probabilistic Risk Assessment for the Seabrook Nuclear Power Plant" (Page 2 of 2)

4. Summary of Progress to Date/ Milestones:

- See Item 2.

5. Next Reporting Period:

The interrelationship of the containment leakage model and accident re-lease categories will be further evaluated. The NRC Project Manager's comments will be factored into the preliminary report and radiological scurce terms will be selected.

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F 1 f A N C I A L b 1 A T U d JArsuAPY 1965 ACCCUNT 1 I T LE Ant FIA 004114 RtVIEr GF PhA FOR SLAhMOUh hPF A-3778 SUFEkVISOR : RE PR1hC1FAL 1hvESTIGATON : PHAIT n.

TERFIhATIOW DATE : 02/30/65 CURNEf.1 YEAH P.O N T ei 10 LATE I DIkECT STAFF EFFORT :

(sap STAFF tObie5) 2.30 e.49 II DIHECl SALAillES : e,760. 32,247 f4ATERIAL 6 SEEklCES 0. O.

t ADF SUPFUnT : 33.- O.

SUBC0hTAAC15 : 0 O.

TRAVEL EXPEhSES : D. O.

InUIRECT EXPEh5ES : 4,180. 12,4e0.

GEhERAL d AOf'IN. : 5,h51. 19,394 T01AL CCSTS : 18,558. 64,101.

PENCEhTAGE OF AVAIL FLii0S SPEr4T : 661 (FY 84 CARRYOVEN +FY 85 FuhDS HECIEVEC 10 DATE)

III Fuh0IAG STATUS :

Fi 1984 FY 19d5 FROJECTED FY 1985 FuhbS FY 1965 FLf0IAG LAhRYLVER FUADlhG LEVEL HEC'U TU DATE HAL. AEEnED ts K) (5 h) (5 h) (5 h)

40. 34 34 O.

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• i FEE RECOVERY COST STATUS FINS A-3778 TITLE: REVIEn OF PHA FOR SEABROOK NPP PERIOD: JAhuARY 1965

$ 5 FY85 TASK / PLANT PERICC CUMULATIVE

-A SEABROOK DOCKET 50-443 18,558 64,102.

TOTALS : 18,558 . 64,102.

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