ML20009F040

Forwards LER 81-013/03L-0.Detailed Event Analysis Encl

ML20009F040
Person / Time
Site:	Cooper
Issue date:	06/24/1981
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20009F041	List: ML20009F040 ML20009F046
References
CNSS810366, NUDOCS 8107280625
Download: ML20009F040 (2)

Text

L EE a-aM/Wel i COOPER NUCLEArt STATION Nebraska Public Power District "A"E, , o~O@ls""^i?^ "'"

CNSS810366 June 24, 1981 1 Mr. K. V. Seyfrit, Director

,f9'1'?Q,(N 69 [( I ,

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

. U, .;

Region IV g Jg{ g 7 Iggt , ~2 m s, j 611 Ryan Plaza Drive y,l, am ,

Suite 1000 }, m g Arlington, Texas 76011 N 0) p s\' '

Dear Sir:

This report is submitted in accordance with Section 6.7.2.B.3 of the Technical Specifications for Cooper Nuclear Station and discusses a reportable occurrence that was discovered on May 28, 1981. A licensee event report form is also enclosed.

Report No.: 50-298-81-13 Report Date: June 24, 1981 Occurrence Date: lby 28, 1981 Facility: Cooper Nuclear Station Brownville, Nebraska 68321 Identification of Occurrence:

Observed inadequacies in the implementation of administrative or procedural controls.

Conditions Prior to Occurrence:

The reactor was in cold shutdown for Maintenance Refueling Outage.

Description of Occurrence:

During performance of Surveillance Procedure 6.3.15.2, the Station Battery Rated Load Test, the rate of discharge on the 125V bat-teries was in excess of the rate required by the procedure. The final cell specific gravity readings were not properly taken and recorded after discharge for three of the four station batteries as required by Technical Specification 4.9.A.3.c. Readings were correctly taken and recorded on approximately 45 percent of the cells of battery 125V 1A and on the pilot cells of batteries 125V 1B and 250V 1B. %hg Designation of Apparent Cause of Occurrence: /

The apparent cause of setting the battery discharge at a higher ///

rate than required was personnel error in reading the procedure.

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l Mr. K. V. Seyfrit June 24, 1981 Page 2.

The after discharge call specific gravity readings were not com-pleted because the hydrometer in use was not of the prc>er range to register readings on the hydrometer scale.

Analysis of Occurrence:

The Station Battery Rated Load Test required u/n battery to be taken out of service at a time during plant shutdown for discharge cesting. The redundant battery was in operation.

The increased discharge rate does not have anfT. armful effsets on the battery. All batteries tested exceeded their required capacities.

This occurrence presented no adverse effects from the standpoint of public health and safety.

Corrective Action:

A procedure change has been initiated to more clearly define the discharge rate required.for the Station Battery Rated Load Test.

Provisions for a quality control check of the battery test will also be incorporated into this change. In addition, a purchase order has been issued to procure hydrometers of the proper range to ensure that specific gravity readings will be taken and recorded.

This LER has been discussed with appropriate personnel.

Sincerely, L. C. Lessor Station Superintendent Cooper Nuclear Station LCL:cg