ML19247A455
| ML19247A455 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/15/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 7907310569 | |
| Download: ML19247A455 (1) | |
Text
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UNITED OTATES
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NUCLEAR REGULATORY CO*,'MisslON WASHINGTCN, D. C. 20555 Y'.N-!/
May 15, 1979 9
Docket Nos. 50-295 and 50-304 Pr. Cordell Reed Assistant Vice President Commonwealth Edison Ccmpany Post Office Box 767100 Chicago, Illinois 60630 Dear Mr. Reeo.
Enclosed for your infomation is a copy of a letter sent to one of the licensees of a Westinghouse two loop plant.
A similar letter Las been sent to the licensees of the otner Westinghouse two loop plants. Note that the use of the rod bank exchange pregram has not yet been approved for other than these two loop plants.
Si ncerely,,.
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A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
As Stated cc:
See next page Tl ABB b
7 0 07310M
Mr. Cordell Reed l
Commonwealth Edison Company May 15, 1979 l
cc:
Robert J. Vollen, Esquire 109 tiorth Dearborn Street Chicago, Illinois 50602 Dr. Cecil Lue-Hing Dirertor of Research and Development Metropolitan Sanitary District of Gredtsc Chicago 100 East Erie Street Chicago, Illinois 60611 Zion-Benton Dublic Library District 2600 Emmaus Avenue Zion, Illinois 60099 Mr. John W. Rcwe Isham, Lincoln and Beale Counselors at Law One First National Plaza 42nd Floor Chicago, Illinois 60603 Susan N. Sekuler, Esquire Russell R. Eggert, Esquire Assistant Attorney General Environmental Control Divisico 188 West Randolph Street, Suite 2315 Chicago, Illinois 60601 lbb T7
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UNITED STATES f,-
.,1 NUCLEAR REGULATORY COMMisslON 73, j
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May 15, 1979
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Docket No. 50-305 Mr. Eugene R. Mathews, Vice President Power Supply and Engineering Wisconsin P iblic Service Corporation P. O. Box 1200 Green Bay, Wisconsin 54305
Dear fir. Mathews:
The Nuclear Regulatory Ccmmission staff has reviewed infornation submitted by the Westinghouse Corporation and two licensees of two loop plants regarding the use of the rod bank exchange (rod swap) method to verify shutdown margin for two loop Westinghouse 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 NSSSs providing the following conditions are met:
1.
T'e ana s for predicting rod worths and shutdocen margin performed b.
stinghouse using the technique proposed to tae NRC at the September 1978 meeting.
2.
All rod banks are measured.
3.
Written approval is obtained from the NR" prior to use of the rod exchange method.
Approval will be based on NRC review of your review c; d acceptance criteria for these rod exchange tests.
Once rie approve your review and acceptance criteria, they need not be resubmitted unless changed.
4.
The test procedure for this method is that identified in a Westinghouse letter to NRC cated April 24, 1979.
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Mr. Eugene R. tiathews May 15, 1979 5.
Within 45 days after the first verification of shutdown margin using the rod bank exchange method, the test data is formally submitted to the NRC.
This approval is only for plants with a two loop NSSS.
Additional information and further review wil? be require, cefore we can reach a conclusion on the use of this method for three and four loop plants.
Sincerely,.
I A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors cc: See next page
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