ML19242A203
| ML19242A203 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/15/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7907310596 | |
| Download: ML19242A203 (1) | |
Text
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UNITED STATES
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.3 NUCLEAR REGUI ATORY COMMISSION I
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j WA 'HINGTON, D. C. 20555 s>uhis
%, ' ^ f May 15, 1979 Docket Nos. 50-338 Mr. W. L. Proffitt Senior Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261
Dear Mr. Proffitt:
Encloseq for your infor nation is a copy of a letter sent to one of the licensees of a Westinghouse two loop plant.
A similar letter has been sent to the licensees of the other Westinghouse two loop plants.
Note that the use of the rod bank exchange program has not yet been approved for other than these two loop plants.
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Si ncerely,
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6Y A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
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Mr. W. L. Prof fitt Virginia Electric and Powcr Company May 15, 1979 cc:
Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond, Virginia 23213 Swem Library College of William and Mary Williamsburg, Virginia 23185 Donald J. Burke U. S. Nuclear Regulatory Commission Region II Office of. Inspection and Enforcement 101 Marietta Street, Sui te 3100 Atlanta, Georgia 30303 e
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9*g UNITEO STATES NUCLEAR REGULATORY COMMISSION f
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,'%..'... d May 15, 1979 Docket No. 50-305 Mr. Eugene R. fiathews, Vice President Power Supply and Engineering Wisconsin Public Service Corporation P. O. Sox 1200 Green Bay, Wi sconsin 54305
Dear ltr fla thews :
The Nuclear Regulatory Commission staf f has reviewed infornation suitted 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 bcron exchange method of verifying shutdown margin for these two loop NSS$s providing the following conditions are met:
1.
The analysis for predicting rod wo: ths and shutdown margin is performed by Westinghouse using tne technique proposed to the NRC at the September 1978 mceting.
2.
All rod banks are measured.
3.
Written approval is obtained from the NRC prior to use of the rod exchange method. Approval will be based on NRC review of your review and acceptance criteria for these rod exchange tests. Once we approve your review and acceptance criteria, they need not be resubmitted ur.' ess changed.
4.
The test procedure for this method is that identified in a Westinghouse letter to NRC dated April 24, 1979.
7906250 191 59C026
Mr. Eugene R. Mathews 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.
Addi tional information and further review wili be required before we can reach a conclusion on the use of this method for three and four loop plants.
Sincerely,,
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C (.oce ME 1__._-
A. Schwencer, Chief Operating Reactors Branch el Division of Operating Reactors cc:
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