ML19331C051

Forwards NRC Position on Three Open Items Remaining from 800708-10 Meeting Re Mechanical Engineering Branch Draft SER

ML19331C051
Person / Time
Site:	Grand Gulf
Issue date:	07/30/1980
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Stampley N MISSISSIPPI POWER & LIGHT CO.
References
NUDOCS 8008140098
Download: ML19331C051 (3)

Text

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JUL J 01960 Docket Nos.: 50-416/417 Mr. N. L. Stampley Senior Vice President - Production Mississippi Power and Light Company P. O. Box 1640 Jackson, Mississippi 39205

SUBJECT:

RESOLUTION OF ACTION ITEMS FROM JULY 8-10,1980 !!P&L/NRC

!!EETING On July 8-10, 1980 mambers of the staff and our reviewers from Pacific Northwest Laboratory (PNL) met with !!ississippi Power and Light and your consultants, for the purpose of reviewing the l'echanical Engineering Branch draft SER. As a result of that meeting, three open items remained.

Our position regarding the resolution of these items is provided in the enclosure.

Please contact us if you desire any discussion or clarification of the enclosed positions.

Sincerely, i

A. Schwencer, Acting Chief Licensing Branch No. 3 Division of Licensing

Enclosure:

As stated l

cc: See next page l

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8008140Of[

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cc: Robert B. McGehee, Esq.

Wise, Carter, Child, Steen & Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy 8. Conner, Jr., Esq.

Conner, Moore & Corber 1747 Pennsylvania Avenue, N. W.

Washington, D. C.

20006 Mr. Adrian Zaccaria, Project Engineer Grand Gulf Nuclear Station Bechtel Power Corporation Gaithersburg, Maryland 20760 Mr. Alan G. Wagner, Resident Inspector P. O. Box 469 Port Gibson, Mississippi 39150 O

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ENCLOSURE

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1.

For the Grand Gulf plant, the use of 10 peak OBE stress cycles in ASME Class 1 fatigue calculations is acceptable.

2.

With respect to whether or not the combined OBE plus SRV stresses should be considered in ASME Class 1 fatigue calculations, we are awaiting the information from GE regarding their OBE and SRV analyses as' agreed upon during our Grand Gulf SER meeting, July 8-10, 1980.

3.

With respect to the GE double sum method for combining closely spaced modes, our decision will be consistent with that reached for Susquehanna.

Therefore, we request that you provide the modal frequencies (0-60hz) for piping analyzed by GE. Furthermore, we have determined that the GE double sum method was approved for GESSAR 251 under the condition that the calculated results would never be lower than those obtained using the SRSS combination method. Please verify that GE performed such an SRSS comparison for its Grand Gulf piping. This iten was discussed extensively with GE (Rudi Villa) during the Susquehanna draft SER meeting, July 15, 1980.

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