ML19326A528

RO NP-33-77-19:on 770708,two Hydraulic Snubbers in Decay Heat Removal Sys Determined Inoperable Due to Lack of Hydraulic Fluid in Remote Reservoir.Caused by Personnel Error.Remote Reservoir Filled & Hydraulic Snubbers Purged

ML19326A528
Person / Time
Site:	Davis Besse
Issue date:	08/02/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19326A521	List: ML19326A520 ML19326A528
References
NUDOCS 8002040708
Download: ML19326A528 (2)

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s TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-19 ,

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DATE OF EVENT: July 8, 1977 FACILITY: Davis-Besse Unit 1.

IDENTIFICATION OF OCCURRENCE

The remote hydraulic fluid reservoir for two l hydraulic snubbers, I.D. No. GCB-7-H4, was found empty.

l Conditions Prior to Occurrence: The plant was in Mode 4. Power: (MWE) = 0 and (MWT) = 0.

Descripcion of Occurrence: At approximately 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> on July 8, 1977, station personnel labeling and inspecting hydraulic snubbers found an empty remote hydrau-lic fluid reservoir for the two (2) hydraulic snubbers (I.D. No. GC3-7-H4) on the Decay Heat System normal cooldown line. These snubbers dampen dynamic pipe movements which could. occur in a seismic occurrence to protect the piping. This placed the station in the Action Statement of Technical Specification 3.7.7.1.

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Desianation of'Accar nt Cause of Occurrence: ' Maintenance personnel found no hydrau-lic fluid contained in the remote reservoir or in the tubing going to the snubber.

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There was no indication of fluid on the floor. Due to the lack of evidence of

. hydraulic fluid in the reservoir or any leakage from the snubbers and fittings,-it

! is apparent that the remote reservoir was never filled by Construction personnel i who were responsible for initial installation -of the snubber.

Analysis of Occurrence

These snubbers were placed on the decay heat line to l ,

prevent excessive movement during a seismic event. Since no seismic events i have occurred, there was no danger to the health and safety of the public or i

station personnel.

1 Corrective Action: Maintenance personnel filled the remote reservoir, purged the two hydraulic snubbers and declared the snubbers operable by 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on i' July'9. This removed the station from the Action Statement of Technical Speci-fication 3 7.7.1. No similar occurrence is' expected since all hydraulic snub-bers have aow been inspected for adequate hydraulic fluid level.

Failure Data:- No previous similar events have occurred.

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