ML20211E166
| ML20211E166 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/28/1987 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-87, REF-PT21-87-038-000 86-753A, PT21-87-038-000, PT21-87-38, NUDOCS 8702240251 | |
| Download: ML20211E166 (3) | |
Text
O VINGINIA EI.EcTHIC AND POWEH COMI*ANY Hicunown,VanoixzA unuGI c 7 jfd 2 P3:ii w.I..sr=waar Vara l'=== n o= =T wm=*= oes =** m==
January 28, 1987 Dr. J. Nelson Grace Serial No.
86-753A Regional Administrator N0/RCB:dmk Region 11 Docket Nos.
50-338 U. S. Nuclear Regulatory Commission 50-339 Suite 2900 License Nos.
NPF-4 101 Marietta Street, N.W.
NPF-7 Atlanta, CA 30323
Dear Dr. Grace:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 NEW SERVICE WATER SPRAY SUPPORT SYSTEM FOLLOW UP REPORT On November 12, 1986 Virginia Electric and Power Company reported a potential defect involving a substantial safety hazard at North Anna Power Station Units 1 and 2 in accordance with 10 CFR 21 (Serial No.86-753). In that report, we committed to ultrasonic testing of suspect materials and development of a repair / replacement plan.
Ultrasonic testing of the suspect materials has been completed, and the results have been documented in a Non-Conformance Report.
Twenty-one steel columns supplied by Rockwell Engineering Company were found to have laminations in the web.
Eight of the defective columns were never installed and will not be used in the spray array support structure.
An action plan for replacing the remaining thirteen defective columns has been developed and is summarized below:
Defective columns will be replaced one at a time by removing the column and the attached footing, temporarily supporting connecting members and
- piping, installing replacement column and footing, and reattaching connecting members and piping.
The replacement plan for each defective column will be reviewed to ensure that injurious stresses are not imparted to adjacent components during the repair process.
Current plans are to replace defective columns prior to placing the new spray array system into operation.
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Should you require further information, please contact me.
Very truly yours, L
y W. L. Stewart
i cc: Director, Office of Inspection and Enforcement (3 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Lester S. Rubenstein Director PWR Project Directorate No. 2 Division of PWR Licensing-A Mr. J. L. Caldwell NRC Senior Resident Inspector North Anna Power Station Mr. Leon B. Engle NRC North Anna Project Manager PWR Project Directorate No. 2 Division of PWR Licensing-A