ML19263E678
| ML19263E678 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 05/15/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 7906250038 | |
| Download: ML19263E678 (3) | |
Text
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bh UNITED ST/ TES NUCLEAR REGULATORY COf. MISSION
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WASHINGTCN. D C. 20555
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May 15, 1979 Docket f :s. 50-282 and 50.306 Mr. L. O. I;ayer,lianager iluclear Support Services tiorthern States Power Company tl4 f;icollet :iall - Eight Floor P.inneapolis, i;innesota 55401
Dear ltr. Mayer:
The fluclear Regulatory Commission staff has reviewed information submitted by the Westinghouse Corporation and two licensees of two 1000 plants regarding the use of the rod bank exchange (rod swap) method to verify shutdown margin for two locp Westingnouse nuclear steam supply systems. Based on our review, we approve the use of this method as an alternative to the boron exchange method of verifying shutdown margin for these two loop tJSSSs providing the following conditions are met:
1.
The analysis for predicting rod worths and shutdown margin is performed by Westinghouse using the technique proposed to the liRC at the Septeaber 1978 meeting.
2.
All rod banks are measured.
3.
Written approval is obtained from the i1RC prior to use of the rod exchange method.
Approval will be based on f;RC review of your review and acceptance criteria for these rod exchange tests. Once we approve your review and acceptance criteria, they
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need not be resubmitted unless changed.
4.
The test procedure for this method is that identified in a Westinghouse letter to f!RC dated April 24, 1979.
2218 104 79062500 3g
Mr. L. O. Mayer May 15,1979 5.
h'ithin 45 days after the first verification of shutdown cargin using the rod bank excharge r.ethod (for each unit), the test data is formally submitted to the fiRC.
This approval is only for plants with a two loop i:SSS.
Additional information and further review will be required before we can reach a conclusion on the use of this method for three and four loop plants.
Sincerely,
/
('.
klGuldM v
A. Schwencer, Chief Operating Reactors Branch =l Division of Operating Reactors cc:
See next page 22iB 105-e O
O
"r. L. O. Mayer Northern States Power Company May 15, 1979 cc:
Geralc Charnoff, Esquire Shaw, Pi ttnan, Potts and Treworidge 1800 11 Street, N.W.
Washington, D. C.
20036 Sandra S. Gardeoring Executive Director Minnesota Dollution Control Agency 7935 x. Ocunty Roac 32 Roseville, Minnesota 55113 The Environmental Conservation Library
!!inneapolis Public Library i
300 Nicollet Mall Minneacolis, 11innesota 55401 Mr. F. P. Tierney, Plant Manager Prairie Island Nuclear Generating Plant Northern States Power Company Route 2 Welch, Minnesota 55089 Joclyn F. 01 son, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W. County Road 82 Roseville, Minnesota 55113 Robert L. Nybo, Jr., Chairman Minnesota-Wisconsin Boundary Area Commission 22]8
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$19 Second Street Hudson, Wisconsin 54016 Clarence D. Fierabend U. S. Nuclear Regulatory Ccenission P. O. Box 374 Rec Wing, Minnesota 55066
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