ML20064C646
| ML20064C646 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/11/1978 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 7810230264 | |
| Download: ML20064C646 (2) | |
Text
.
VIRGIN $ A ELECTRIC AND POWER COMP ANY, RICHMOND, VIRGINI A 23268 1
October 11, 1978 Mr. James P. O'Reilly, Director Serial No. 575 Office of Inspection L Enforcement PSE&C/LCK/bep/mc U. S. Nuclear Regulatory Commission
.T Region II Docket No. 50-339 101 Marietta Street, Suite 3100 Atlanta. Georgia 30303
Dear Sir:
On October 6,1978, a report was made under the p ovisions of 10CFR50.55(e)
%g-*n%c a,p_ossible deficiency in the calculation of the LOCA peaking factor
'snfMts 15f^t'he -APDMS hardware for North Anna Unit 2.
~
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 P. O. Box 26666 Richmond, Virginia.
23261 B.
Facility, activity, and/or component affected:
a __
North Anna Power Station, Unit 2
-T Z.
AxiaT-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 comoly:
A similar facility utilizing Westingbouse APDMS hardware for cal-culating the LOCA peaking factor shape limits, discovered a non-conservative error in the computer software which determined the alarm setpoint envelope. This error is caused by a calculational round off which could increase the setpoint above the desired value by as much as 1.1%.
77/0NOMY b
\\
m. -
vmomiA ELECTRIC Ano Powen COMPANY TO Mr. James P. O'Reilly SMaar No.
2 E.
Date of determination of reportability:
October 6, 1978 F.
Similar components, activities, or services:
North 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 pennanent solution is currently being discussed with Westinghouse.
H.
Other information:
None Any information not available at this time will be submitted in a follow-up letter as a 30-day report.
Should you require further information, please contact this office.
er,
uly curs f[Qi i
Sa C. Brow,
Vi e President - Power ta ion E gineering and Constr t'on cc: Director, Office of Inspection andEnforcement(3) e
'~
p
-,y y.%
e,,
,,~,-a-v
. w e.,
c p
,--s 7,-
-,,-,----c,- - -
_