ML19329B874

RO NP-32-17-10:on 770714,parts of Valve Liners Found in Strainer on Suction of Component Cooling Water Pump 1-1. Cause of Degradation Unknown.Loop 1-1 Placed in Svc W/Strainers to Intercept Any Lease Particles in Sys

ML19329B874
Person / Time
Site:	Davis Besse
Issue date:	08/03/1977
From:	Brown R, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19329B827	List: ML19329B826 ML19329B874
References
NUDOCS 8002060879
Download: ML19329B874 (3)

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\O)s U . TOLEDO EDISCN COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-10 DATE OF EVENT: July 14, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Possible degrading of Component Cooling Water .

System.

3 Conditions Prior to Occurrence: The plant was in Mode 4, with Power (MWI) = 0 and Load (MWE) = 0.

Description of occurrence: On July 14, 1977, at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />, during the removal of startup strainer on suction of Component Cooling Water (CCW) Pump 1-1, chunks of valve liners were found in the strainer. Since valves CC171, an 18 inch Fisher Butterfly and CC1467,an 18 inch Hammel-Da 1 Butterfly (Decay Heat Re-moval Cooler 1-1 Outlet Isolation Valves) were reported leaking past the seat the previous day, it was concluded that the larger sirat pieces of liners were from valves CC171 and CCl467. A small 3" liner which w.a also found in the

.( strainer was concluded as being from either CC1454 or CC1457, Spent Fuel Pool Heat Exchanger Temperature Control Valves.

This occurrence is being reported in compliance with Administrative Control Technical Specification 6.9.1.S(i) . The station was not in violation of any Technical Specification and did not enter into any action statements.

The strainer was reinstalled in CCW Pump 1-1, and the pump was returned to service to pick up any additional ubber liner which may be in the system. The valves CC171,'CC1467, CC1454 and CC1457 were scheduled to be removed from ser-vice to inspect liners and to make necessary repairs.

Designation of Aoparent Cause of occurrence: The exact cause of failure is unknown. Upon disassembly and inspection of valves CC1467 and CC171, the liner had no indication of being bonded to the body with an epoxy which was specified by the valve manufacturer. Improper alignment by construction personnel is a second suspected possible cause. --

1 Analysis of occurrence: There was no danger to the health and safety of the public or station-personnel as a result of this occurrence. The other compon-ent cooling water loop was operable during the cause of this occurrence. No aberrations have been encountered in that loop.

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, , TOLEDO EDISON *C MO PANY DAVIS-BESSE UNIT CNE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-10 PACE 2 Corrective Action: , Component Cooling Water Loop 1-1 has been placed in service with strainers to intercept any loose particles in the system, At 1600 hcurs on July 28, 1977, new liners were installed on valves CC171 and CC1467 and the valves were reinstalled into the syste=. Valves CC1454 and CC1457 are presently being repaired by Maintenance personnel. These steps were taken to prevent recurrence, l

Failure Data: There have been.no previous similar occurrences.

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