ML20038C461
| ML20038C461 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 11/17/1981 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8112110077 | |
| Download: ML20038C461 (3) | |
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Docket Nos. 50-416 NOV 1 '/1981 ge and 50-417 p
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'b Mr. J. P. McGaughy, Jr.
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Assistant Vice President.
p tiuclear Production ACRS (1 Mississippi Power & Light Coripany Post Office Box 1640 N
Jackson, Mississippi 39285
Dear Mr. McGaughy:
Subject:
Request for Additional Infomation-- Turbine Disc Integrity In the perfomance of the Gra~nd Gulf licensing review, the staff has identifidd concerns in regard to turbine disc integrity. The infomation that we require is identified in the enclosure.
We request that you provide the infomation not later than January 15, 1982.
If you require any clarification of this request, please contact M. D. Houston, Project Manager, at (301) 492'-8430.
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Sincerely, A. Schnencer, Chief
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Licensing Branch flo. 2 Division of Licensing
Enclosure:
Request for Additional infomation cc w/ encl:
See next page 8112110077 811117 PDR ADGCK 05000416 A
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NRC FORM 318 (10-80) NRCM 024o
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1, Mr. J. P. McGaughy Assistant Vice President Nuclear Pr'oduction Mississippi Power & Light Company P. O. Box 1640 Jackson, Mississippi 39205 cc: Robert B. McGehee, Esquire Wise, Carter, Child, Steen and Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy B. Conner, Jr., Esquire Conner and Wetterhahn 1747 Pennsylvania Avenue, N. W.
Washington, D. C. 20006 e
Dr. D. C. Gibbs, Vice President Middle South Energy, Inc..
225 Baronne Street P. O. Box 6100 New Orleans, Louisiana 70161 Mr. John Richardson Mississippi Power & Light Company P. O. Box 1640 Jackson, Mississippi 39205 Mr. R. Trickovic, Project Engineer Grand Gulf Nuclear Station
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Bechtel Power Corporation Gaithersburg, Maryland 20760 Mr. Alan G. Wagner Resident Inspector Route 2, Box 150 Port Gibson, Mississippi 38150 e
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ADDITIONAL INFOR!!ATION REQUEST MATERIALS ENGINEERING BRANCH DIVISION OF ENGINEERING We have reviewed Section 10.2.3 of the Final Safety Analysis Report submitted by the applicant. Our evaluation cannot be completed without additional information from the applicant relating to the design, assembly and operating conditions of the low pressure turbine discs. Past experience with similar equipeent in the United Kingdom and more recently with Westinghouse turbines in the United States has revealed a propensity for stress corrosion cracking in discs which was not predictable. In order for the staff to assess the potential for stress corrosion cracking in the applicant's plant, the following information will be required.
A-What lubricant was used in the hub area of the discs for assembly.
B-What are the similarities / differences between the discs in the Grand Gulf turbir.es and those used by Westinghouse.
C-What are the operating temperatures in the bore area of the discs.
D-Which disc or discs are exposed to a moisture level during operation that approximates the level of moisture present in cases of cracking.
E-What are the calculated critical crack sizes and what is the method used to calculate that size.
3, F-What capability for volumetric inspection of the disc hub areas is available to Grand Gulf.
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