05000298/LER-1981-023, Forwards LER 81-023/03L-0.Detailed Event Analysis Submitted

Forwards LER 81-023/03L-0.Detailed Event Analysis Submitted

ML20033D228
Person / Time
Site:	Cooper
Issue date:	11/25/1981
From:	Lessor L NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20033D229	List: 05000298/LER-1981-023, Forwards LER 81-023/03L-0.Detailed Event Analysis Submitted 05000298/LER-1981-023-03, /03L-0:on 811026,uncalibr Temp Switch Installed in MS-TS-1480 During 1981 Refueling Outage.Caused by Technician Error.Technicians Counseled.Will Color Code Switches & Revise Surveillance Procedure
References
CNSS810730, NUDOCS 8112070417
Download: ML20033D228 (2)

LER-1981-023, Forwards LER 81-023/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
2981981023R00 - NRC Website

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COOPER NUCLE AR STATION Nebraska Public Power District

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CNSS810730 November 25, 1981 l,

Mr. K. V. Seyfrit, Director

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U.S.-Nuc1 car Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011

Dear Sir:

This ieport 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 October 26, 1981. g g' D censee event report form is also enclosed.

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Report No.:

50-298-81-23

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Ii Report Date:

November 25, 1981 Occurrence Date: October 26, 1981 DE04

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Facility:

Coop *: Nuclear Station ut %

Brownville, Nebrnska 68321

%uou Identification of Occurrence:

Operating a primary containment and reactor vessel isola b/Mi cM with a temperature detector installed that has not been cal in accordance with Table 4.2.A, Page 1 of the Technical Specifi-cations.

Conditions Prior to Occurrence:

The reactor was in cold shutdown candition during a maintenance outage.

3escription of Occurrence:

While performing Surveillance Test Procedure 6.2.1.6.1 during the 1981 Refueling Outage an uncalibrated temperature switch was in-stalled in MS-TS-148D position. This error was discovered while

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performing Surveillance Test Procedure 6.2.1.6.2, Temperature Switch Calibration.

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Mr. K. V. Seyfrit' November 25, 1981 Page 2.

Designation of Apparent Cause of Occurrence:

The apparent cause of this occurrence was personnel error.

Analysis of Occurrence:

The function of temperature _ switch MS-TS-148D is to monitor area temperature above the main steam line and to initiate main steam line isolation upon sensing high temperature. The redundant temp-erature switches were replaced during 1981 spring refueling outage and were operating properly.

During the spring 1981 refueling outage the temperature switch MS-TS-148D was removed.

Instead of being replaced with a calibrated spare, it was replaced with a switch removed from another location which had not been calibrated.

The temperature switch removed from MS-TS-148D was tested and found to be within Technical Specification limit. This occurrence pre-sented no adverse consequences from the scandpoint of public health and safety.

Corrective Action

Temperature switch MS-TS-148i was replaced with a switch that had been recently calibrated. The personnel error in not replacing this switch with a calibrated replacement was discussed with the technicians involved. To provide the. technician with better guid-ance, the temperature switches will be color-coded so that on any operating cycle only one color switches should be installed.

Surveillance Test Procedure 6.2.1.6.1 will be revised to provide the technician with the identifica*. ion ~information on the switch that is to be removed.- These items will be completed prior to the end of this operating cycle.

Sincerely,

' L..C.

Lessor

' Station Superintendent Cooper Nucicar Station LCL:cg Attach.

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