ML20080Q720
| ML20080Q720 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/05/1983 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, John Miller Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19268E158 | List: |
| References | |
| 482, NUDOCS 8310170091 | |
| Download: ML20080Q720 (2) | |
Text
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o VinorNIA ELECTRIC AND PowEn COMPANY HICIIMOND,VIRGINI A 2O2G1 W.L.SinwAmr x E[i. o[.7E.
October 5, 1983 Mr. Harold R. Denton, Director Serial No. 482 Office of Nucle.sr Reactor Regulation N0/JHL:acm Attn:
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 Commission NPF-7 Washington, D. C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 MAIN GENERATOR FAILURE AND MAIN TRANSFORMER FAILURE REPORTS Enclosed, as Attachment 1, is the North Anna Unit No. 1 main generator failure report for the main generator failure that occurred on December 5,
1982.
Enclosed, as Attachment 2, is a non-proprietary report on the main transformer failures at North Anna Unit Nos. I and 2 for the seven main transformer failures that occurred between November 29, 1980 and December 5,
1982.
Enclosed, as Attachment 3, is a proprietary report on the seven transformer failures that occurred at North Anna Unit Nos. I and 2.
The generator report summarizes the insulation failure of the North Anna Unit 1 generator during the December 5, 1982, phase B step-up transformer fault.
Westinghouse representatives have outlined their findings of an internal generator inspection performed at the sic-subsequent to the fault.
They present these results with an analysis of the limited fault recorder data and an explanation for this particular insulation failure.
The transformer report gives a historical synopsis of each failed transformer.
Also included is a multi-dimensional correlation study to analyze possible adverse effects on the failure rate of Westinghouse generator step-up transformers.
The transformer report also provides an electrical system investigation, transformer processing information, gas evolution causes, oil electrification effects, dielectric analysis of line lead configuration, impulse distribution and resonant frequency analysis, and sensitivity tests of the acoustic waveguide system.
The transformer report specifically covers a transformer and system analysis of the December 5, 1982, event at North Anna Unit No. 1. contains information proprietary to Westinghouse Electric Corporation, it is supported by an affidavit signed by Westinghouse, the owner of the information. The affidavit sets forth the basis on which t.he informa-tion may be withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's regulations.
8310170091 831005 gU PDR ADOCK 05000338 3
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o Harold R. Denton VinotwlA Ex.zcTate Amo Powra Couraxy To Accordingly, it is respectfully requested that the information which is proprietary to Westinghouse be withheld from public disclosure in accordance with 10 CFR Section 2.790 of the Commission's regulations.
Correspondence with respect to the proprietary aspects of the Application for Withholding or the supporting Westinghouse affidavits should reference CAW-83-77, and should be addressed to R. A. Wiesemann, Manager, Regulatory and Legislative Affairs, Westinghouse Electric Corporation, P. O. Box 355, Pittsburgh, PA 15230.
Ver tru y,yours,
.) (9AMd W. L. Stewart Attachments cc:
Mr. James P. O'Reilly Regional Administrator Region II Mr. M. B. Shymlock NRC Resident Inspector North Anna Power Station I