05000298/LER-1981-019, Forwards LER 81-019/03L-0.Detailed Event Analysis Submitted

Forwards LER 81-019/03L-0.Detailed Event Analysis Submitted

ML20010F972
Person / Time
Site:	Cooper
Issue date:	08/25/1981
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20010F973	List: 05000298/LER-1981-019, Forwards LER 81-019/03L-0.Detailed Event Analysis Submitted 05000298/LER-1981-019-03, /03L-0:on 810728,during Surveillance to Prove Operability of Diesel Generator 1,fuel Supply Hose Developed Leak.Caused by Excessive Localized Flexure & Vibration. Hose Replaced
References
CNSS817125, NUDOCS 8109150172
Download: ML20010F972 (2)

LER-1981-019, Forwards LER 81-019/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
2981981019R00 - NRC Website

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Mr. K. V. Seyfrit

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Office of Inspection and Enforcement M/

Region IV 4/

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611 Ryan Plaza h \\ \\

Suite 1000 Arlington, Texas 76011

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 July 28, 1981. A licensee event report form is also enclosed.

Report No.:

50-298-81-19 Report Date:

August 25, 1981 Occurrence Date:

July 28, 1981 Facility:

Cooper Nuclear Station Brownville, Nebraska 68321 Identification of Occurrence:

A ccadition occurred which resulted in operation in a degraded node permitted by a limiting condition for operation established in Section 3.5.F.2 of the Technical Specifications.

Conditions Prior to Occurrence:

The reactor was at 96% of rated thermal power.

Description of Occurrence:

During performance of Surveillance Procedure 6. '.12.1, to prove operability of li Diesel Generator (DG) prior to makiag the 'B' gQ loop of the containment cooling subsystem inoperable for mainten-ance, a fuel supply hose developed a leak. The DG was shut down y

and declared inoperable.

Designation of Apparent Cause of Occurrence:

The fuel supply hose leak was caused by a combination

>f excessive localized flexure of the hose and vibration.

i ME 281981 ih 8109150172 810825 PDR ADOCK 05000298 S

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Mr. K. V. Sovfrit August 25, 1981 Page 2.

Analysis of Occurrence:

The station's emergency power system consists of two emergency diesel generators, each capable of supplying power for post acci-dent safety system operation and safe reactor cooldown.

The flexible fuel supply hose provides the connection between rigid fuel supply piping and engine mounted equipment. During the event in question, the hose started leaking. Had the DG been required under accident conditions, it would have continued to run with the leak; however, the engine was shut down during the test due to equipment safety considerations. Repair procedures were immed-istely initiated and the hose was replaced within one hour.

During this event the normal, startup and emergency transformers were available to supply power as the station required. This event presented no adverse consequences to the public health and safety.

Corrective Action

The fuel line was replaced immediately. The DG was tested and returned to service. During an outage scheduled to start in Septecher 1981, the fuel line will be repiped to alleviate the sharp bend in the tubing and provide for better alignment.

Sincerely, mm L. C. Lesser Station Superintendent e

Cooper Nuclear Station LCL:cg Attach.