ML19263B673
| ML19263B673 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/11/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-79-094-000 024, 24, NUDOCS 7901220355 | |
| Download: ML19263B673 (3) | |
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January 11, 1979 Mr. James P. O'Reilly, Director Seri-1 tio. 024 Office of Inspection & Enforcement P~
'/ LCK,jr. : bep/mc U. S. fluclear Regulatory Comission Region II Docket tio. 50-339 101 Marietta Street, Suite 3100 -
Atlanta. Georgia 30303
Dear Sir:
On January 8,1979, a report was made under the provisions of 10CFR50.55(e) concerning a possible deficiency in the calculation of the axial flux shape Fj(z) by the APDMS hardware for t' orth Anna Unit 2.
In accordance with the reporting requirements of 10CFR21, the following information is submitted:
A.
flame and address of reporting individual:
Mr. E. A. Baum, Executive Manager Licensing and Quality Assurance Virginia Electric and Power Company F. O. Box 26666 Richmond, Virginia 23261 B.
Facility, activity, and/or component affected:
fiorth Anna Pcwer Station, Unit 2 Axial Power Distribution Monitoring System (APDMS)
C.
Name of firm constructing the facility or supplying the component, activity or service.
Westinghouse Electric Corporation Water Reactor Divisions P. O. Box 355 Pittsburg, Pennsylvania 15230 D.
Description of defect, deficiency, or failure to comply:
Vepco has determined that the Axial Power Distribution Monitoring System (APDMS) doer not properly account for the in-core moveable detector background signal when determining the axial flux shape, Fj(z).
Since APDMS does not subtract the background signal from the measured flux signal, it has been determined from a review of :; orth Anna Unit 1 flux map data that the value calculated by APDMS for the peak of the axial flux shape has been in error by as much as 0.4 percent.
However, the calculation of Fj(z) is only non-conservative for values greater than 1.0.
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r a Mr. James P. O'Reilly E.
Date of determination of reportability:
Jannry 8,1979 F.
Similar components, activities or services:
fiorth Anna Power Station, Unit 1 G.
Corrective action which has been, is being or will be taken, the indi-vidual responsible and the length of time to complete the action:
The equipment is not yet operational.
A permanent solution is currently being discussed in-house and with Westing %use.
H.
Other information:
"one Any information not available at this time will be submitt_d in a follow-up letter as a 30-day report.
Should you require further information, please contact this office.
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Director, Office of Inspection and Enforcement (3)
ATTACHED IS PART 21 REPORT FRC:i IE l' AIL U ilT - ROC;; 317 E/W s
PART 21 IDEitTIFICATIO rio.
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PRELI:tII:ARY EVALUATIO:! 0F THE ATTACHED REPORT I.'!DICATS LEAD RESFO SIBILITY FOR FOLL D'.:-U? AS SFO'..: E ELO'.!:
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