ML20009C119

Forwards LER 81-048/03L-0.Detailed Event Analysis Encl

ML20009C119
Person / Time
Site:	McGuire
Issue date:	05/07/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C120	List: ML20009C119 ML20009C129
References
NUDOCS 8107200302
Download: ML20009C119 (3)

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h/- gCN- 684 Mr. James P. O'Reilly, Director U. S. Nuclear megulatory Commission g(j '

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Re: McGuire Nuclear Station Unit 1 2 JUL 171981* r Docket No. 50-369 E, "*h gu '4

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Dear Mr. O'Reilly:

g Please find attached Reportable Occurrence Report R0-369/81-48. This report concerns the operability of the wide range level instrument for Steam Gene-rator B Remote Shutdown Monitoring Instrumentation. This incident was con-sidered to be of no significance with respect to the health and safety of the public.

Very truly yours, bCW ~

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William O. Parker, Jr. /

RWO:pw Attachment cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission Post Office Box 10412 Washington, D. C. 20555 Palo Alto, CA 94303 M. J. Graham Resident Inspector McGuire Nuclear Station s/ f I

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McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number: 81-48 Report Date: April 24, 1981 Occurrence Date: April 10, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence: The wide range level instrument for Steam Generator B Remote Shutdown Monitoring Instrumentation was declared in-operable.

Conditions Prior to Occurrence: Mode 3, Het Standby Description of Occurrence: On April 10, 1981 at 0912 hours0.0106 days <br />0.253 hours <br />0.00151 weeks <br />3.47016e-4 months <br />, the Shift Supervisor discovered that Steam Generator 1B Wide Range Level Recorder (1CFCR5610) in the Control Room was pegged high. The level indicator (1CFCP5620) on the Auxiliary Feedwater Pump 'A' Panel was checked and found that it was also pegged high. The S/G '1B' wide range level in-strumentation was declared inoperable and this was a reportable incident pursuant to Technical Specification 3.3.3.5.

Apparent Cause of Occurrence: The S/G '1B' wide range level recorder and indicator were pegged high because their transmitter was valved out. The root valve of one leg was closed and the equalizing valve was opened.

Analysis of Occurrence: During the performance of the Monthly Surveillance Items Checklist for Mode 3, personnel found that the S/G 1A and IB Wide Range Lesal Recorder in the Control Room was pegged high. The remote in-dicator was checked and it was also pegged high. It was found that the transmitter impulse line was valved out and the recorder was out of cali-bration. It is unknown at this time when or how the instrument was valved out. When it was discovered that the indicators were pegged high, they were declared inoperable.

Safety Analysis: The S/G wide range level transmitters send a signal to the remote indicators to provide S/G 1evel indication outside the Control Room.

These instruments serve as the only S/G level indicators should it become necessary to evacuate the Control Room to the Auxiliary Shutdown Panel.

There are several S/G narrow range level indicators in the Control Room.

These narrow range transmitters are also used co provide control signals to the Reactor Protection and Control Cabinets and to the accident monitoring instrumentation. Since the Control Room was available at the time the S/G '1B' Wide Range Level Instrumentatior war inoperable, the safe eneration of the plant and the health and safety ot the public were not affected.

1 Report Number 81-48 Page 2

Corrective Action

The closed root valve was opened and the equalizing valve was closed. The transmitter was tested and the recorder was calibrated. The S/G 1B Wide Range Level Instrumentation was declared operable on April 10, 1981 at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />, i

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