ML19208B384
| ML19208B384 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 08/23/1979 |
| From: | Thomas C Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7909200128 | |
| Download: ML19208B384 (5) | |
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}y AUG 2 31979 Docket Nos. 50-416 and 50-417 APPLICANTS: Mississippi Power & Light Company and Middle South Energy, Inc.
FACILITY:
Grand Gulf Nuclear Station, Units 1 and 2
SUBJECT:
SUMMARY
OF Al' GUST 15, 1979 MEETING On August 15, 1979, we met with representatives of Mississippi Power & Light Company and Middle South Energy, Inc. (the applicants) and their agents Bechtel Power Corporation and General Electric Company in Bethesda, Maryland to discuss matters concerning load definitions, load cases and load combination methodology for the Grand Gulf Nuclear Station, Units 1 and 2.
An attendance list is enclosed.
The most significant points of the meeting are sumarized below:
1.
The applicants advised us that with one exception they intend to utilize the loads defined in General Electric Company Report.22A4365, " Interim Containment Loads Report - Mark III Containment," Revision 2, for the Grand Gulf Nuclear Station. That exception is a 35-percent reduction in the amplitude of the safety / relief valve discharge loads, based on Caorso test data, for piping and equipment (no amplitude reduction will be taken for structures). We requested that the applicants submit for our review as soon as possible documentation supporting their intended use of these loads.
2.
The applicants described their proposed in-plant safety / relief valve test program for verifying the safety / relief valve discharge loads.
The applicants had characterized the test program as confirmatory in nature.
We advised the applicants that we consider the test program to be more than confirmatory in that it will be relied upon to verify certain Mark III containment parameters. Consequently, we requested that '.:.e applicants submit for our review as soon as possible the details of their proposed test program.
In addition, we advised the applicants that we will likely require that additional instrumentation be provided to determine local and bulk suppression pool temperatures during the safety /
relief valve discharge tests.
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The applicants described their positions with respect to Load Case 2 (Normal + All Safety / Relief Valves + Operational Basis Earthquake) and Load Case 10 (Nonnal + One Safety / Relief Valve + Safe Shutdown Earthquake
+ Design Basis Accident). The applicants maintained that it is not nece:sary to perform fatigue analyses for 1.oad Case 2 and that Load Case 10 is unrealistic for piping and equipment. We advised the applicants that we would be receptive to considering further the merits of their arguments and encouraged the applicants to submit for our review documentation supporting their arguments.
4.
The applicants stated their position that the square-root-of-the-sum-of-the-squares method for combining loads should be allowed for safety / relief valve discharge loads as well as seismic and loss-of-coolant accident loads.
We advised the applicants that we are considering this matter for Mark II containment plants and would be receptive to considering it for Mark III containment plants as well. However, we cautioned the applicants that any approval of such methods for M&rk II containment plants would not automati-cally assure approval for Mark III containment plants. Such approval would be contingent upon the demonstration of the requisite time histories for the Mark III containment plant loads.
5.
The applicants advised us that they are expending considerable effort in requalifying the equipment for the Grand Gulf Nuclear Station, that the equipment is being requalifie'd to the loads defined in General Electric Company Report 22A4365, Revision 2, with a 35-percent reduction in the amplitude of the safety / relief valve discharge loads cod that certain modifications ar.d additions are being made to acconnodate these loads.
0cd0, jk&W4?V Cecil 0. Thomas, Project Manager Light Water Reactors Branch No. 1 Division of Project Management
Enclosure:
Attendance List cc: See next page 1
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AUG 2 31979 Mr. N. L. Stampley cc:
Mr. Robert B. McGehee, Attorney Wise, Carter, Child, Steen &
Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy B. 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. N. L. Stampley Vice President - Production Mississippi Power and Light Company P. O. Box 1640 Jackson, Mississippi 39205 r
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ENCLOSURE ATTENDANCE LIST AUGUST 15, 1979 MEETING WITH MISSISSIPPI POWER & LIGHT COMPANY Mississippi Power & Light Company Middle South Energy, Inc.
N. Stampley K. Iyengar L. Dale E. Chumley T. Johnson Bechtel Power Corporation General Electric Company A. Zaccaria L. Sobon J. Ward T. Trocki P. Moskal D. Robare M. David P. Stancavage P. Kochis L. Koke R. Beck R. Hails A. Menendez J. Parikh G. Wang Advisory Committee on Reactor Safeguards Nuclear Regulatory Commission H. Walker H. Brammer R. Mattu J. Knight S. Hou K. Brown
- 1. Su J. Kudrick M. Fields W. Butler C. Thomas x \\()
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