ML20072C303
| ML20072C303 | |
| 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 8306210015 | |
| Download: ML20072C303 (3) | |
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4 ss.es ROCHESTER GAS AND ELECTRIC CORPORATION 89 EAST AVENUE, ROCHESTER, N.Y.1 6Y b
JOHN E MAfra June 8, 1983
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v.c. me o.m aeta coca vis 546 2700 Mr. James M. Allan, Acting Regional Administrator U.S.
Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenuc King of Prussia, Pennsylvania 19406
Subject:
IE Bulletin No. 83-03:
Check Valve Failures in Raw Water Cooling Systems of Diesel Generators.
Dear Mr. Allan:
In cccordance 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 is supplied frcm Lake Cntario via the Ecrvice Water System.
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"
Emergency 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 Eoiler 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 Station Quality Assurence Manual requires that these valves be stroke tested at least quarterly.
In accordance with these requirements the check valves are streked 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.
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Q0CHESTER GAS AND ELECTRIC COCP.
SHEET NO. ?
DATE June 8, 1983 1 T0 Mr. James M. 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).
The purpose of this procedure is to verify the closure tightness of each service water discharge check valve.
This test essentially confirms the integrity of the valve internals by use of a back flow test as permitted by this IE Bulletin.
This backflow test has been successfully completed on a refueling basis since 1974.
The test compares loop header pressures before and after manually securing the pump discharge valve.
No 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 the pump capacity.
Historically these pressure changes have been negligible and normally e psi is the indicated test result.
4 During the 1982 Refueling shutdown valve 4604 for the "D" t'
service water pump was disassembled and inspected using procedure M-37.69 (Inspection and Maintenance of Service Water Pump Discharge Check Valves).
This maintenance was performed as a result of an observable backflow through the check valve causing the service C
water pump to rotate in the reverse direction.
The valve disassembly revealed wear on the bushings and shaft area.
The hinge pins 1 also enhibited some worn areas.
The valve internals were still completely intact and no evide'nce of valve failure existed.
The entire valve internals were replaced as part of the preventative maintenance prcgram.
The th'rce-other service water pump discharge check valves (46C1, 4602, 4601) 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 leak testing that confirms the integrity of the valve internals during each-refueling shutdown.
In the future these valves will be listed as a,ctive category A valves in the In-Service Test program.
This change to the IFT program will be submitted to you on or before necember 31, 1983.
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ROCHESTER CAS AND ELECTRIC CC';P.
SHEET No. 3 DATE June 8, 1983
- TO Mr. James M. Allan Cn April 20, 1983 a backflow test was performed on these four check valves.
The results of this test indicated no lea % age and confirmed the integrity of the valve internals.
Very truly yours,
/
JoNn E. Maier Subscribed and sworn to me on this g/4 day of duNN 1983 2-gf hA p
RICHARD F. LAITENBERGER Notary Pub!ic State of New York Monroe County, N.Y.
Commission Expires March 30.1S p-=
Reg. No. 2235125 xc:
Document Control Desk 9
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