ML19259B440
| ML19259B440 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/05/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 024A, 24A, NUDOCS 7902090354 | |
| Download: ML19259B440 (1) | |
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Vepco February 5,1979
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~ Mr. ; James P. - 0'Reilly, Director ~
Serial No. 024A Office of Inspection & Enforcement PSE&C/LCK,ar.:mac/ wang U. S. Nuclear Regulatory Commission Regicn II.
Docket No. 50-339 101Jiarietta1 Street, Suite 3100' Atlanta,fGeorgia' '30303'
Dear Sir:
'In accordance with 10CFR50.SS(e), the NRC, Region II,.was notified on
-January 8,1979 that' the Nor.th Arina Unit 2 Axial Power Distribution Monitoring System '(APDMS) *provided' by' Westinghouse Electric Corporation does not account
- for the in-core moveable detector background signal when determining the axial-flux shape, Fj(z).
If a significant background signal were present during
. surveillance, the calculation'of Fj(z) would be non-conservative for values greater then 1.0.
m Vepco is currently working to determine the significance of this potential problem. Since this effort is not yet complete, you should consider this an
_ interim report.
The APDMS equipment is not yet operational and thus a delay of-a resolution will have no consequences. A final report will oe forthcoming subsequent to the_ completion of our work effort.
If you require any further information at this time, please contact us..
Very trul yours, Sam C. Gr
, Jr.
Senior Vice resident Power Station Engineering and Construction ec: Mr. John G. Davis, Acting Director Office of Inspectiun.& Enforcement Mr'. Harold R. Denton, Director Office of Nuclear Rector Regulation
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