ML19259A830
| ML19259A830 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/03/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 7901110061 | |
| Download: ML19259A830 (2) | |
Text
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'*r UNITED STATES
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~i NUCLEAR REGULATORY CCMMisslON f
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WASHINGTON, D C. 20555 O 8 d /.!
January 3, 1979
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Docket Mos. 50-232 and 50-306 M,r. L. O. Maye r,
Manager of Nuclear Support Services Northern States Power Company 414 Nicollet Mall, 8th Floor Minneapolis, Minnesota 55401
Dear Mr. Mayer:
By letter dated May 21, 1977, you provided a detailed evaluaticn of the potential consequences of a postulated fuel handling accident inside containment at the Prairie Island Nuclear Generating Plant Units Mos. 1 and 2.
We have reviewed your analysis and have de-termined that the assumptions used for the analysis are comparable with the guidance of Regulatory Guide 1.25 and justified by the quality of the equipment on which you rely.
However, since the high volume purge does not have safety-grade charcoal filters, which are necessary for us to conclude that the potential conse-quences of this accident are appropriately within the guidelines of 10 CFR Part 100 (i.e., less than 100 rem thyroid), we have had to assume that for at least 306 hours0.00354 days <br />0.085 hours <br />5.059524e-4 weeks <br />1.16433e-4 months <br /> following shutdown the only containment purge during the accident would be the low volume purge.
There are no limits in the Prairie Island 1/2 Technical Specifi-cations on which to base this assumption. Therefore, within 60 j
days of the date of this letter, you should (1) propose specifi-cations to permit only the use of the low volume purge during fuel handling operations inside containnent or (2) justify why the low volume purge need not be the only purge operated and propose other means to keep potential consequences of this postualted accident appropriately within the guidelines of 10 CFR Part 100.
Sincerely /
JhcdWAW A. Scnwencer, Chief Operating Reactors Branch !1 Division of Operating Reactors cc:
See next page 7 9 01110 0 Gl
.g Northern States Power Company 2-January 3, 1979 cc:
Gerald Charnoff, Esquire Shaw, Pittman, Potts & Trowbridge 1800 M Street, NW Washington, D.C.
20036 Sandra S. Gardebring Executive Director Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 The Environmental Conservation Library Minneapolis Public Library 300 Nicollet Mall Minneapolis, Minnesota 55401 Mr. F. P. Tierney, Plant Manager Prairie Island huclear Generating Plant Northern States Power Company Route 2 Welch, Minnesota 55089 Joclyn F. Olson, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W County Road B2 Roseville, Minnesota 55113 Robert L. Nybo, Jr., Chairman Minnesota-Wisconsin Boundary Area Connission 619 Second Street Hudson, Wisconsin 54016 Clarence D. Fierabend USNRC P. O. Box 374 Red Wing, Minnesota 55066 8
.