05000298/LER-1981-007, Forwards LER 81-007/03L-0.Detailed Event Analysis Submitted

Forwards LER 81-007/03L-0.Detailed Event Analysis Submitted

ML20004D757
Person / Time
Site:	Cooper
Issue date:	05/26/1981
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20004D758	List: 05000298/LER-1981-007, Forwards LER 81-007/03L-0.Detailed Event Analysis Submitted 05000298/LER-1981-007-03, /03L-0:on 810426,diesel Generator 1 Cylinder Temp Increased During Surveillance Procedure 6.5.12.1 W/Reactor in Cold Shutdown.Caused by Temporary Air Pressure Test Gauge Which Fell Off Control Air Supply
References
CNSS810313, NUDOCS 8106090734
Download: ML20004D757 (2)

LER-1981-007, Forwards LER 81-007/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
2981981007R00 - NRC Website

text

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Coop 8R NUCLEAR STATION y,

Nebraska Public Power District

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s May d, 1981 Gr.it(Id 6 f* f f.;*i 0 S 1981 d u :-. inwoe [

5 Mr. K. V. Seyfrit, Director comssese 4

i U.S. Nuclear Regulatory Commission y

Office of Inspection t.nd Enforcement

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Mgion IV

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611 Ryan Plaza Drive Suite 1000 Ar_ington, 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 April 26, 1981. A licensee event report form is also enclosed.

Report No.:

50-298-81-07 Report Date:

May 26, 1981 l

Occurrence Date: April 26, 1981 t

Facility:

Cooper Nuclear Station Brownville, Nebraska 68321 a

Identification of Occurrence:

A condition which could have resulted in operation in a degraded mode permitted by the limiting condition for operation established in Section 3.5.F.1 of the Technical Specifications.

Conditions Prior to Occurrence:

The reactor was in cold shutdown for refueling.

Description of Occurrence:

During performance of Surveillancs Procedure 6.3.12.1, #1 diesel generator cylinder exhaust temperature increased.

Designation of Apparent Cause of Occurrence:

A temporary air pressure test gauge installed on the control air supply to the inlet air damper fell off. Thus allowing the inlet air dampers to go partially closed and initiating an increased cylinder temperature due to insufficient combustion air.

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M060go7 3 f

ca Mr. K. V. Seyfrit May 26, 1981 Page 2.

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Analysis of Occurrence:

The #1 diesel generator is one of two diesel generators installed I

at CNS to supply emergency power. The subject air pressure gauge had been previously installed to assist in identifying various control air pressures at different locations on the engine to complete acceptance criteria for the DG muffler bypass modifi-cation. The gauge was connected with a short piece of 1/8" stain-less steel turbine and two (2) Swageloc connections. The failure occured in the tubing a?.lowf ag the test gauge to fall to the floor.

i The redundant diesel gene.rator was operable. This occurrence presented no adverse consequences from the standpoint of public health and safety.

Corrective Action

The #1 diesel r,enerator was secured and the tubing failure was corrected by installing a Swageloc cap. Number i diesel generator was tested satisfactorily approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> after securing.

The #2 diesel generator was inspected and no corresponding test i

gauge was installed. Appropriate engineering and maintenance personnel have been briefed with respect to the gravity of this occurrence and a copy of this LER will be routed for review.

Sincerely, L. C. Lessor Station Superintendent Cooper Nuclear Station i

LCL:cg Attach.

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