ML17275B067

Requests Addl Info Re Facility FSAR in Area of Reactor Sys by 810724

ML17275B067
Person / Time
Site:	Columbia
Issue date:	06/08/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Ferguson R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
References
NUDOCS 8106120086
Download: ML17275B067 (6)

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'ocket No. 50-397 Washington Public Supply System ATTN:

Nr. R. L. Ferguson Nanaging Director 3000 George Washington i<ay Richland. Mashington 99352 DIST.

Docket Fiie NRC PDR LPDR.

LB¹2 ASchwencer NService WOATQRK RLTedesco DEisenhut/RPurple OILE(3)

ACRS(16)

TERA NSIC

Attorney, OELD TCollins

SUBJECT:

MNP-2 FSAR - RE(UEST FOR ADDITIONAL INFORNATION As a result of our review of your application for operating license, we find that we need additional information regarding the WNP-2 FSAR.

The, specific information required is,.in the area of reactor systems-and is listed in the Enclosure.

To maintain our licensing review schedule for the >INP-2 FSAR, we will

,need responses to the enclosed request by July 24, 1981. If you cannot meet this date, please inform us within seven days after receipt of this letter of the date you plan to submit your responses so that we may review our schedule for any 'necessary changes.

Please contact Raj Auluck, Licensing Project Nanager, if you desire any discussion or clarification of the enclosed request.

Sincerely, Orlgfxel @~ %

pgbgf I Tedesce Robert L. Tedesco, Assistant Director for Licensing Division of Licensing

Enclosure:

Request for Additional Information cc w/ enclosure:

See next page 810612 0 ~~

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R. L. Ferguson Managing Director Washington Public Power Supply System P. 0.

Box 968 3000 George Washington Way

Richland, Washington 99352 ccs:

Nicholas Reynolds, Esq.

Debevoise 8 Liberman 1200 Seventeenth

Street, N.W.

Washington, D.

C.

20036 Richard Q.

Qui g 1 ey, Esq.

Washington Public Power Supply System P. 0.

B'ox 968

Richland, Washington 99352 Nicholas Lewis, Chairman Energy Facility Site Evaluation Council 820 East Fifth Avenue Olympis, Washington 98504 Hr. Albert D. Toth Resident Inspector/HPPSS-2 NPS c/o U.S. Nuclear Regulatory Commission P. 0.

Box 69

Richland, Washington 99352 Nr, G.

C. Sorensen, Licensing Manager Washington Public Power Supply System P. 0.

Box 968

Richland, Washington 99352 Nr. 0.

K. Earle, Project Licensing Supervisor Burns and Roe Incorporated 601 Williams Boulevard

Richland, Washington 99352

ENCLOSURE Reactor Systems Branch 211.213 Calculations of NPSH available to ECCS pumps in BWRs are normally provided with reference to the pump suction.

We are concerned that under certain post accident conditions the potential may exist for damage to ECCS pumps from cavitation because of local flashing in the system suction lines.

The potential can result for example from local elevation changes in the piping runs.

Cal-culations of NPSH available at the pump suction may erroneosly assume liquid

'ontinuity up to the point of pump suction.

Provide an analysis with calculations which demonstrates that the NPSH available at all points in all safety related pump suction piping is adequate to preclude local flashing and pump cavitation under the worst postulated conditions.