ML18153C677
| ML18153C677 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 07/08/1991 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 89-572F, GL-89-13, NUDOCS 9107220092 | |
| Download: ML18153C677 (3) | |
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VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 July 8, 1991 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNIT 2 RESPONSE TO GENERIC LETTER 89-13 SERVICE WATER SYSTEM PROBLEMS AFFECTING SAFETY-RELATED EQUIPMENT Serial No.:
89-572F SPS/JWH/pmk Docket No.:
50-281 License No.:
DPR-37 Generic Letter 89-13 provided recommended actions to address various problems with service water systems which have, in the past, led to system degradation or failure. By letters dated January 29, 1990 and April 30, 1991 (Serial Nos.89-572 and 89-572E), Virginia Electric and Power Company described the program which would be implemented to ensure that the service water system at Surry Power Station will be in compliance with appropriate regulations, specifications, and design basis documentation. In accordance with the generic letter, we are notifying you that the Unit 2 portion of the program has been implemented during the Cycle 1 O refueling outage. This letter is to confirm that the activities of the program, as described below, have been initiated.
CHEMICAL TREATMENT EVALUATION An interim chemical treatment system was implemented in April, 1991. This system is used to inject chlorine into stagnant 48 inch service water headers to retard the growth of hydroids. A study of the James River ecosystem is in progress to support a long-term biofouling control strategy. This evaluation is scheduled for completion by April, 1992.
INSPECTION AND MAINTENANCE PROGRAM Inspections of the Unit 2 high level intake structure and RSHX service water inlet and outlet piping were performed. The service water supply lines to the RSHXs were cleaned of marine growth. Inspection of Control Room Chiller Condenser service water lines will be performed during power operation and will be completed by December 31, 1991. Future inspection scope and frequency will be based on initial inspection results, ecosystem study results, and the effectiveness of operational changes and biofouling control measures. Other heat exchangers cooled by service water are currently monitored, tested or inspected on a routine basis and cleaned as
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necessary. These activities were reviewed and determined to constitute an adequate inspection and maintenance program.
HEAT TRANSFER CAPABILITY VERIFICATION A program to verify the heat transfer capability of safety-related heat exchangers cooled by service water has been developed. Service water flow testing of Unit 2 RSHXs was performed during the outage with satisfactory results.
Heat transfer testing of the three recently replaced Component Cooling Water Heat Exchangers (CCWHXs) was completed prior to the 1991 Unit 2 refueling outage. Testing of the Control Room Chiller Condensers and remaining CCWHX will be conducted during plant operation (with normal heat loads) and is scheduled for completion by August 31, 1991. Other heat exchangers cooled by service water are subject to periodic
. monitoring, testing, inspection, or cleaning. These activities have been reviewed and determined adequate to verify the capability of these heat exchangers to perform their design basis function.
DESIGN BASIS CONFIRMATION A physical verification walkdown of the Unit 2 service water system was performed with no significant discrepancies being identified. The Design Basis Document for the service water system was distributed in April, 1991.
Remaining actions will be completed in accordance with the schedule provided in our January 29, 1990, letter. Please contact us if you have any questions.
J~
W. L. Stewart Senior Vice President - Nuclear cc:
U.S. Nuclear Regulatory Region II 101 Marietta Street, N.W.
Suite 2900 Atlanta, Georgia 30323 Mr. M. W. Branch NRC Senior Resident Inspector Surry Power Station
I COMMONWEAL TH OF VIRGINIA )
)
COUNTY OF HENRICO
)
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by W. L. Stewart who is Senior Vice President - Nuclear, of Virginia Electric and Power Company.
He is duly authorized to execute and file the foregoing document in behalf of that Company, and the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this 8 7j/ day of ----'=,=,tl-lfA.,Ll"",1----' 19c:J I.
My Commission Expires: ~~
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_ _&_t_Jj_l&L Notary Public (SEAL)