ML20101S043
| ML20101S043 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/31/1985 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, John Miller Office of Nuclear Reactor Regulation |
| References | |
| 696A, NUDOCS 8502050202 | |
| Download: ML20101S043 (2) | |
Text
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Vxmo1NxA ELECTRIC AND Powan COMPANY Rrenwown,VrmorxrA 23261
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January 31, 1985 Mr. Harold R. Denton, Director -
Serial No. 696A Office of Nuclear Reactor Regulation EC:BSD:baj:2003N Attention: Mr. James R. Miller, Chief Docket Nos. 50-338 Operating Reactors Branch No. 3 50-339 Division of Licensing License Nos. NPF-4 U. S. Nuclear Regulatory Comission NPF-7 Washington, D.C.
20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA UNIT NOS. 1 AND 2 GENERAL DESIGN CRITERIA 17 ANALYSIS Your letter of November 13, 1984, provided a revised and updated Safety Evaluation for North Anna Units 1 and 2 with relation to GDC-17.
In that
-letter,-it was requested that the NRC be kept apprised of the status of the motor control center contactor coils.until such time that the final report regarding this matter is submitted for NRC review.
In our letter of July 7,1983 (Serial No. 326), Vepco stated that tests would
'be performed on motor control center contactor coils to determine the effects of overvoltage.
- Based on our-presently available information we anticipate the test report will be available to Vepco in-February, 1985. Based on the receipt of the report in February, Vepco will submit the results to you in March, 1985.
Based on the aging which has been completed, the life of the contactor coils exceeds 10 years. We do anticipate that the replacement of some size I coils may be required at some future date. Since most loads fed from size I starters operate intermittently and operate less than 20 percent of the time, most size I coils will not require replacement. ~A review of the duty cycle of size 1 contactors has been performed. The preliminary results indicate 79% of the size 1 coils will not require replacement,16% will require replacement every 20 years and 5% will require replacement every 10 years.
We will continue to provide you with updates on the motor control center contactor coil-test results per your request.
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- VinotwA EtaCTRIC Awa Powsm Commwr To cc: Mr. James P.l 0'Reilly:
Regional Administrator Region'II:
Mr. M. N.. Branch NRC - Resident -Inspector.
North Anna. Power Station s
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