ML19254F263
| ML19254F263 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/07/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| References | |
| REF-PT21-79-147-000 NUDOCS 7911070441 | |
| Download: ML19254F263 (2) | |
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cm A tLECTRIC AND POWER COMP ANY, RICMMON D, VIRGINI A 23261 3f 19 AfD. 2 4 September 7, 1979 Mr. James P. O'Reilly, Director Serial No. 724 Office of Inspection & Enforcement PSE&C/WBR:mac: wang U. S. Nuciear Regulatory Commission Region II Docket Nos. 50-404 101 Marietta Street, Suite 3100 50-405 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
On September 4, 1979, a report was made under the provisions of 10CFR50.55(e) concerning overpressurization of the contairment from a main steam line break.
In accordance with the reporting requirements of 10CFR21, the following information is submitted:
A.
Name and address of reporting individual:
Mr. E. A. Baum, Executive Manager Licensing and Quality Assurance Virginia Electric and Power Company Richmond, Virginia 23261 B.
Facility, activity, and/or component affected:
North Anna Power Station, Units 3 & 4 C.
Name of fim constructing the facility or supplying the component, activity or service:
Stone & Webster Engineering Corporation P. O. Box 2325 Boston, Massachusetts 02107 D.
Description of defect, deficiency, or failure to comply:
The original PSAR analyses did not consider the long term blowdown from t main steam line break. Later afialyses show that the long term blowdown will overpressurize the containment.
E.
Date of determination of reportability:
September 4, 1979 1'"2 225 7 91LO70 b b
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OMYXAL OOPY S
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Similar components, activities, or services:
None G.
Corrective action which has been, is being or will be taken, the individual responsible and the length of time to complete the action:
Vepco, S&W and B&W are investigating modifications to the auxiliary feedwater system to limit auxiliary feedwater flow to the broken steam generator in the. event of a main steam line break.
H.
Other infomation:
None Any information not available at this time will be submitted in a follow-up letter as a 30-day renort.
Should you require further ir. formation, p ' ease contact, his office.
Ver-uly ou'rs /
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C. Brown, Jr.
Senior Vice President - Power Sta io Engine ingandConstruction(
cc: Director, Office of Inspection and Enforcement (3)
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