05000298/LER-1981-009, Forwards LER 81-009/03L-0.Detailed Event Analysis Submitted

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Forwards LER 81-009/03L-0.Detailed Event Analysis Submitted
ML20009A584
Person / Time
Site: Cooper Entergy icon.png
Issue date: 06/01/1981
From: Lessor L
NEBRASKA PUBLIC POWER DISTRICT
To: Seyfrit K
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20009A585 List:
References
CNSS810326, NUDOCS 8107130346
Download: ML20009A584 (2)


LER-1981-009, Forwards LER 81-009/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
2981981009R00 - NRC Website

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CSSS810326 June 1, 1981 j

Mr. K. V.

Seyfrit, Director [f

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement

UL 101981 5 7

Region IV u. s.,,my n 611 Ryan Plaza Drive

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Suite 1000

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Arlington, Texas 76011 dy

Dear Sir:

This report is submitted in accordance with Section 6.7.2.B.2 of the Technical Specifications for Cooper Nuclear Station and discusses a reportable occurrence that was discovered on May 3, 1981. A licensee event report form is also enclosed.

Report No.:

50-298-81-09 Report Date:

June 1, 1981 Occurrence Date: May 3, 1981 Facility:

Cooper Nuclear Station Brownville, Nebraska 68321 Identification of Occurrence:

A condition which resulted in operation in a degraded mode per-mitted by the limiting condition for operation established in Section 3.6.H.5 of the Technical Specifications.

Conditions Prior to Occurrence:

The reactor was in cold shutdown for refueling.

Description of Occurrence:

During performance of Special Procedure 81-05, two mechanical shock suppressors were found inoperable (S/N 416 & 409).

Designation of Apparent Cause of Occurrence:

The apparent cause of this occurrence is under evaluation.

5:

I 8107130346 810601 PDR ADOCK 05000298 S

PDR

Mr. K. V. Seyfrit June 1, 1981 Page 2.

Analysis of Occurrence:

The two subject shock suppressors are model number PSA-10 manu-factured by Pacific Scientific. They were installed on the Reactor Recirculation and Main Steam System piping inside primary containment.

The mechanical shock suppressors are installed to protect the piping during a seismic event. No known seismic events occurred since the last inspection.

This occurrence presented no adverse consequences from the stand-point of public health and safety.

Corrective Action

The subject shock suppressors were replaced. Additional shock suppressors associated with the same piping system were inspected in accordance with IE Bulletin No. 81-01.

A failure analysis of the subject shock suppressors will be included in our response to IE Bulletin No. 81-01.

Sincerely, m

L. C. Lessor Station Superintendent C

r Nuclear Station LCL:cg Attach.

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