ML20076F355
| ML20076F355 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/08/1983 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 IEB-83-03, IEB-83-3, NUDOCS 8306140025 | |
| Download: ML20076F355 (3) | |
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ROCHESTER GAS AND ELECTRIC CORPORATION
- 89 EAST AVENUE, ROCHESTER, N.Y.14649 xam e um June B, 1983
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. u caer m 546 2700 Mr. James M. Allan, Acting Pegional Administrator U.E. Nuclear Regulatory Commission Office of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Subject:
IE Bulletin No. 83-03:
Check Valve Failures in Raw Water Cooling Systems of Diesel Cenerators.
Dear Mr. Allan:
In accordance with required actions 4 and 5 for holders of Cperating Licenses as stated in IE Bulletin 83-03, the following report is hereby submitted.
Cooling water for the diesel generators it supplied frcm Lake Cntario via the Eervice Water Eyctem.
The service water system is comprised of four (4) pumps and two (2) loops which supply cooling water to either diesel generator.
A complete walkdown of all of the service water supply and return piping to and from the "A"
and "B"
Eriergency Diesel Generators has been performed.
This walkdovn showed no presence of check valves in the flow path with the exception of the four service water pump discharge check valves (4601, 4602, 4603, 4604).
These four check valves are 14" Crane Co. swing check valves.
These four check valves are presently included in the plant pump and valve In-service Test program required by section XI of the AEME Eciler and Pressure Vessel Code.
These valves are considered category C check valves and are thus required to be exercised to the position required to fulfill their safety function.
Appendix C to the Rochester Gas and Electric Ginna Etation Quality Assurance Manual requires that these valves be stroke tested at least quarterly.
In accordance with these requirements the check valves are strcked as part of the monthly service water pump surveillance
. test (PT-2.7).
As stated in this test the ability to obtain a total flow of 2200 gpm is considered adequate to verify check valve' opening, i
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4 ROCHESTER GAS AND ELECTRIC CORP.
5HEET NO. ?
o4rE June 8, 1983 To f1r. James fl. Allan In addition to the monthly testing a leak check is performed at each refueling interval.
This leak check is performed in accordance with procedure RSSP-2.5 (Service Water Pump Discharge Check Valves).
She purpose of this procedure is to verify the closure tightness of each service water discharge check valve.
1his test esecntially ccnfirms the integrity of the valve internals by use of a back ficw test as permitted by this IE Eulletin.
This backflow test has been successfully completed on a refueling basis since 1974.
The test ccmpares loop header pressures beiere and after manually securing the pump discharge valve.
?:o specific acceptance criteria is imposed on the test, however the test results are reviewed and maintenance activities would be performed on these valves if test data so dictated.
The test results themselves do not specify a leakage or backflow rate but only a pressure change.
Using the pump curve a 1/2 psi increase in header pressure would correspond to approximately a 50 gpm leak or about 1% of tne pump capacity.
IIistorically these pressure changes have been negligible and normally P psi is the indicated test result.
During the 1982 Refueling shutdown valve 4604 for the "D" service vater pump was disassembled and inspected using procedure M-37.69 (Inspection and Paintenance of Service Water Pump Diccharge Check Valves).
This maintenance was performed as a result of an observabic backflow through the check valve causing the service water pump to rotate in the reverre direction.
The valve disassembly revealed wear on the bushings and shaft area.
The hinge pins also exhibited scme worn areas.
The valve internals were still completely intact and no evidence of valve failure existed.
She entire valve internals were replaced as part of the preventative maintenance program.
The three other service water pump discharge check valves (4601, 46P2, 4603) were disassembled and inspected during the 1983 Refueling shutdown currently in progress.
The valve internals again exhibited worn areas consistent with valves that have been in service for fifteen years.
The valve internals were replaced as part of the preventative maintenance program.
The In-Service Test program will be modified to include Icak testing that confirms the integrity of the valve internals during each refueling shutdown.
In the future these valves will be listed as active category A valves in the In-Service Test program.
This change to the IFT program will be submitted to you on or before Dccember 31, 1983.
ROCHESTER GA5 AND ELECTRIC CORP.
SHEET NO. 3 DATE June 8,1983 70 Mr. James M. Allan on April 20, 1983 a backflow test was performed on these four check valves.
The results of this test indicated no Icakage and confirmed the integrity of the valve internals.
Very truly yours, MM.b r Jokn E. Maier Subscribed and cworn to me on this g/4 day of juN/E' 1983 h/f khy 0
RICilARD F. LAITENBERGER Notary Public State of New York Monroe County, N.Y.
b-Commission Espires March 30.19 Reg. No.2235125 xc:
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