05000298/LER-1980-039, Forwards LER 80-039/03L-0

Forwards LER 80-039/03L-0

ML20002B940
Person / Time
Site:	Cooper
Issue date:	11/19/1980
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20002B941	List: 05000298/LER-1980-039, Forwards LER 80-039/03L-0 05000298/LER-1980-039-03, /03L-0:on 801023,snubber RH-S-29 Discovered Inoperable.Caused by Work in Area Damaging Snubber.Snubber Repaired & Protective Shield Installed
References
CNSS800658, NUDOCS 8101070360
Download: ML20002B940 (2)

LER-1980-039, Forwards LER 80-039/03L-0

Event date:
Report date:
2981980039R00 - NRC Website

text

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7[$b Nebraska Public Power District

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COOPER NUCLE AR STATION

' * ^ " ' ' '

qO.) %s CNSS800658 November 19, 1980 N

Mr. K. V. Seyfrit, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement "i

I Region IV p.

611 Ryan Plaza Drive

[

.a Suite 1000 J

Arlington, Texas 76011

Dear Sir:

This report is submitted in accordance with Section 6.7.2.B.2 of the Technical Specific ~tions for Cooper Nuclear Station and discusses a

]

reportable occurrence that was discovered on October 23, 1980. A li-censee event report form is also enclosed.

Report No.:

50-298-80-39 Report Date:

November 19, 1980 Occ;rrence Date: October 23, 1980 Facility:

Cooper Nuclear Station Brownville, Nebraska 68321 Identification of Occurrence:

A condition which resulted in operation in a degraded mode per-mitted by a limiting condition for operation established in Section 3.6.H.3 of the Technical Specifications.

4 Conditions Prior to Occurrence:

Reactor was operating at approximately 99.9% of rated thermal power.

Description of Occurrence:

During inspection of the drywell personnel airlock area, station personnel discovered snubber RH-S-29 inoperable.

Designation of Apparent Cause of Occurrence:

The apparent cause of this occurrence has been attributed to sta-tion personnel damaging the snubber while working in the area.

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<,, tt e303070JW 5

Mr. K. V. Seyfrit November 19, 1980 Page 2.

Analysis of Occurrence:

RH-S-29 is a hydraulic shock suppressor installed to allow thermal I

growth of the attached piping during normal operation and to provide a rigid pipe support during a seismic event. This snubber does not provide a pipe support function during normal operation. There were no recorded seismic events prior to this occurrence.

tP.-S-29 is mounted in a horizontal position approximately 10" above the floor and adjacent to a concrete wall which has a storage rack attached.

It is helieved that the snubber was rotated out of position when it was inadvertently stepped on during an area cleanup. When the snubber was rotated the hydraulic fluid res-ervoir was on the bottom of the hydraulic cylinder allowing the oil inlet port to the cylinder to become open with no oil supply.

This condition made the snubber inoperable. This occurrence had no adverse effect on the public health and safety.

Corrective Action

The snubber was correctly oriented and stroked to insure cylinder operability. A protective shield has been installed to protect the snubber. This occurrence has been reviewed by appropriate station personnel.

Sincerely, d

h L. C. Lessor Station Superintendent Cooper Nuclear Station LCL:cg Attach.

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