ML20198G583

Forwards Mods Tp SER Covering Areas of PSAR Where Review Disclosed Deficiencies in Auxiliary Feedwater Sys Ability to Withstand Pipe Break & Coincidental Single Active Failure

ML20198G583
Person / Time
Site:	Washington Public Power Supply System
Issue date:	04/15/1975
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Moore V Office of Nuclear Reactor Regulation
References
CON-WNP-1058 NUDOCS 8605290685
Download: ML20198G583 (4)

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DISTRIBUTION:

t Docket File l'

NRR Reading APR 151975 CS Redding i

i APCSB Reading Docket Nos. 50-460 50-513 r

,i Voss A. Moore. Assistasit Director for Light Water Reactors. Group 2, RL REVISION 1 TO SAFETY EVALUATION REPORT, AUZILIARY AND POWER CONVERSION SYSTEMS BRANCE Plant Names Washington Public Power Supply System Nuclear Projects No. 1 and No. 4 (WNP - 1 and 4) l Licensing Stage: CP j

Docket Numbers: 50-460; 50-513 Responsible Branch: LWR 2-3 l

Project Manager: Thomas Cox i

The enclosed modifications to our SER covers areas of the PSAR (up to and l

including Amendment 15) where our review disclosed deficiencies in the j

ability of the auxiliary feedwater system to withstand a pipe break and a coincidental single active failure. The applicant has committed to revising the system design to provide the required level of protection in i

a manner similar to the auxiliary feedwater system described in the Bellefonte MAR, Amendment 18, Docket Numbers 50-438 and 50-439. However, the auxiliary.feedwater system design does not meet our position requiring diverseity of power supplies to the system control valves, and remains an open item.

The results of our independent analysis,.ns detailed in Section 2.4.3 of j

the SER, have shown the applicant's transient heat analysis of the ultimate i

heat sink to be inadequate. The enclosed modifications to our SER also I

revise the ultimate heat sink such that it is now an open item. The

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applicant will have to provide justification for the use of a 40:: nozzle efficiency in his transient heat analysis of the spray pond, or provide an i

ultimate heat sink design based on a transient heat analysis which uses a 25% nossle efficiency. We will report our evaluation of the applicant's resolution in a supplemental report to the SER.

Original signed by i

Robert L. Tedesco Robert L. Tedesco, Assistant Director for Containment Safety Division of Technical Review l

Office of Nuclear Reactor Regulation

Enclosures:

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Voss A. Moore APR 151975 ccr S. Hanauer, TA D. Eisenhut, NRR F. Schroeder, TR A. Giambusso, RL W. Mcdonald, MIPC V. Benaroya, APCSB A. Schwencer, RL T. Cox, RL S. Varga, RL P. Matthews, APCSB D. Fischer, APCSB W. LaFave, APCSB J. Glynn, C3 i

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NRR Reading l

APR 151975 Cs n.dding APCSB Reading Docket Nos. 50-460 50-513 Voss A. Moore, Assistant Director for Light Water Reactors, Group 2, RL REVISION 1 TO SAFETT ETALUATION REPORT, AUXILIARY AND P0imR CONTIESION SYSTEMS BRANCE Plset Names Wa=Magten Public Power Supply System Nuclear Projects No. 1 and No. 4 (WNP - 1 and 4)

Licensing Stage CP Docket Wumbers: 50-460: 50-513 Responsible Branch: LVR 2-3 Project Naamger: Thomas Cox The enclosed modifications to our SEE covers areas of the.PSAR (up to and including Amendment 15) where our review disclosed deficiencies in the l

ability of the auxiliary feedwater system to withstand a pipe break and a j

coineidental single active failure. The applicant has committed to l

revising the system design to provide the required level of protection in a issneer similar to the auxiliary feedwater system described in the Bellefonte PSAR, Amendment 18, Docket Ntmbers 50-438 and 50-439. However.

the auxiliary feedwater system design does not meet our position requiring j

diversity of power supplies to the system control valves, and remaina an open item.

s The results of our independent analysis, as detailed in Section 2.4.3 of the SER, have shown the applicant's transient hee.: analysis of the ultimate heat sink to be inadeqttate. The enclosed modifications to our SER also i

revise the ultimate heat sink such that it is now an open item. The I

applicant will have to provide justification for the use of a 40*. nozzle i

efficiency in his transient heat analysis of the spray pond, or provide an i

ultimate heat sink design based on a transient heat analysis which uses a 25% nessle efficiency. We will report our avslustion of the applicant's resolu.*. ion in a supplemental report to the S2R.

Original si,, --

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Robert _L. Teavyo Robert L. Tedesco, Assistant Director for Containment Safety l

Division of Technical Reviev

- Offico of ::uclear Ronctor "quintion i

Enclosures:

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