ML19294B496

Advises of Confirmatory Piping Analysis by Pnwl.Requests Info Re Safety Relief Valve Discharge Line 16 for Analysis of Upset Condition

ML19294B496
Person / Time
Site:	Grand Gulf
Issue date:	02/14/1980
From:	Baer R Office of Nuclear Reactor Regulation
To:	Stampley N MISSISSIPPI POWER & LIGHT CO.
References
NUDOCS 8003040108
Download: ML19294B496 (3)

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UNITED STATES y

a, NUCLEAR REGULATORY COMMISSION li

<j WASHINGTON, D. C. 20555 FEB 141980 Docket Nos. 50-416 and 50-417 Mr. N. L. Stampley, Vice President Proirction and Engineering Mississippi Power and Light Company P. O. Box 1640 Jackson, Mississippi 39205

SUBJECT:

CONFIRMATORY PIPING ANALYSIS BY ORC CONSULTANT FOR GRAND GULF NUCLEAR STATION Recently, the Mechanical Engineering Branch (MEB) has instituted a program of performing an independent confirmatory piping analysis for each plant under-going operating license review.

For Grand Gulf, this analysis will be per-formed by our contract personnel at Pacific Northwest Laboratory (PNL). The purpose of this independent analysis will be to verify that the subject piping system meets the applicable ASME Code stress criteria. We do not intend to resolve differences between our calculated stresses ar.d those of your designer, unless unusually large discrepancies are found or er.less Code criteria are not met.

This program will allow MEB to verify on a sampling basis that your designer has correctly modeled his piping, has correctly used his computer codes, and has adequately accounted for the piping's as-built condition.

We will require certain information in order to proceed with our analysis.

Upon receipt of this information, PNL will evaluate it to detennine if addi-tional information os clarification are required. We have chosen for our Grand Gulf analysis the #16 SRV Discharge Line. You should submit two copies of the following information:

1.

piping layout and isometric drawings sufficient to model the system 2.

support drawings with support and hanger spring rates 3.

the piping design specification 4.

valve weights and CG's 8003040 gOg

Mr. N. L. Stampley RB14iSPE 5.

appropriate response spectra dppropriate ancho:" point movements 7.

any design change noti es not yet incorporated into the piping or support drawings (Later DCN's should be forwarded as received).

We will analyze this line for the upset condition (N + OBE + SRV).

In this respect, the applicant should include in his submittal the suppression pool drag loads and dynamic load factors necessary to analyze the submerged portions of the lint.

One copy of '.he above information should be submitted to this address, Attention:

T. C. Houghtoi, and one copy should be sent to:

Mery Bampton Pacific Northwest Laboratory Richland Boulevard Richland, Washington 99351 As our analysis proceeds, we will also require the applicant to provide certain of its analytical results for comparatite purposes, such as the ASME Code required Design Reports.

Sincerely, M t. M Robert L. Baer, Chief Ligh: Water Reactors Branch No. 2 Division of Project Management ces: See next page

Mr. N.

L'. St ampl ey Mr. N. L. Stanpley Vice President - Production Mississippi Power and Light Canpany P. O. B ox 1640 Jackson, Mississippi 39205 ccs: Mr. Robert B. McGehee, Attorney Wise, Carter, Child, Steen and Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy B. Conner, Jr., Esq.

Conner, Moore ared 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