ML20126D360

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Forwards Request for Addl Info to Complete Review of 840604 Application for Exemption to GDC 17,10CFR50,App A.Info Requested by 840706
ML20126D360
Person / Time
Site: Grand Gulf, 05000000
Issue date: 06/22/1984
From: Adensam E
Office of Nuclear Reactor Regulation
To: Richard J
MISSISSIPPI POWER & LIGHT CO.
Shared Package
ML19263A614 List:
References
FOIA-84-459 NUDOCS 8506150048
Download: ML20126D360 (4)
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Jure 22,1984 Docket No. 50-416 Mr. J. B. Richard Senior Vice President, Nuclear Mississippi Power & Light Company P.O. Box 23054 4 Jackson, Mississippi 39205

Dear Mr. Richard:

Subject:

Request for Additional Information Regarding MP&L Application for Exemption to GDC 17, Appendix A to 10 CFR 50, Submitted June 4, 1984 In our review of the subject application for exemption to the NRC rules, we have developed the enclosed request for additional information needed to com-plete our review.

Please amend your application for exemption to comply with the requests listed in the enclosure. Our review schedule is based on the assumption that the additional information will be available by July 6, 1984. If you wish clarification of the requests or if you cannot meet these dates, please advise 4

L. L. Kintner (301) 492-7038.

The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.

4 96-511.

Sincerely, C, ' '. : ~ ; d [7 L .s G.l.x s u Elinor G. Adensam, Chief Licensing Branch No. 4 '

Division of Licensing

Enclosure:

As stated cc: See next page 8506150048 850205 PDR FOIA BELL 84-459 PDR

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GRAND GULF Mr. J. B. Richard Senior Vice President, Nuclear Mississippi Power & Light Company P.O. Box 23054 Jackson, Mississippi 39205 cc: Robert B. McGehee, Esquire Wise, Carter, Child, Steen and Caraway P.O. Box 651 Jackson, Mississippi 39205 Nicholas S. Reynolds, Esquire Bishop, Liberman, Cook, Purcell and Reynolds 1200 17th Street, N.W.

Washington, D. C. 20036 Mr. Ralph T. Lally Manager of Quality Middle South Energy Inc.

225 Baronne Street P.O. Box 61000 New Orleans, Louisiana 70161 Mr. Larry Dale, Director Nuclear Licensing and Safety Mississippi Power & Light Company P.O. Box 23054 Jackson, Mississippi 39205 Mr. R. W. Jackson, Project Engineer Grand Gulf Nuclear Station Bechtel Power Corporation l Gaithersburg, Maryland 20760 Mr. Alan G. Wagner Senior Resident Inspector Route 2, Box 399 Port Gibson, Mississippi 39150 James P. O'Reilly, Regional Administrator U.S. Nuclear Regulatory Consnission, Region II 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 l

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. .y ~ .c ENCLOSURE-REQUESTS FOR ADDITIONAL INFORMATION REGARDING MP&L APPLICATION FOR PARTIAL, TEMPORARY EXEMPTION TO 10 CFR PART 50, APPENDIX A, CRITERION 17 SUBMIlitD JUNE 4, 1984

1. In addition to GDC-17 several other General Design Criteria (GDC-33, 34, 35, 38, 41 and 44) address the need for both on-site and off-site power. Each of these additional GDCs should be addressed explicitly in your request for exemption. Also, GDC-1 and GDC-2 should be addressed in your request for exemption.
2. In the May 16th Shoreham Order, the Commission stated that "the applicant should include a discussion of its basis for concluding that, at the power levels for shich it seeks authorization to operate, operation would be as safe under the conditions proposed by it, as operation would have been with a fully qualified onsite A/C power source." The MP&L exemption request compares operation at 5% power without the TDI diesels to operation at 100%

power with TDI diesels. It does not address the criterion provided by the Comission in the Shoreham Order. The application should be amended to show that the proposed operating conditions are as safe as operation at 5% power with fully qualified TDI diesels available.

3. Item (3) in Attachment 2 states "As already noted, only 6 of the events analyzed in Chapter 15 require the assumption of the unavailability of offsite AC power operation." This statement is in direct contradiction to GDC-17. Although the Standard Review Plan does not explicitly address the assumption of the unavailability of offsite power for many transients, GDC-17 does not limit itself to a particular set of transients and accidents.

A more appropriate statement might be that the specified acceptable fuel design limits would not be exceeded by assuming the unavailability of offsite power for those transients. Please confirm this is the case and revise your statement accordingly. ,

4. Item (3) of Attachment 2 discusses a LOCA analysis in which a film I coefficient of H=0.05 BTV/hr/ft2/*F is used. Provide additional discussion which clarifies what this particular film coefficient is used for and when it is~used.
5. Provide additional information concerning the boil-off calculation discussed in Attachment 2.

Items which should be addressed include:

1) Length of time RCIC is assumed to operate and water level at time RCIC is assumed to fail.
2) Details drywell.of the calculation of heat losses from the reactor vessel to In particular:

a) heat transfer coefficient (s) used and how obtained

r t';[ 3' b) heat capacities for heat sinks in containment and.how obtained c) calculation of drywell temperature.

3) Decay heat
4) Volume or mass of water above the top of the core.

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