05000369/LER-1981-060, Forwards LER 81-060/03L-0.Detailed Event Analysis Encl

Forwards LER 81-060/03L-0.Detailed Event Analysis Encl

ML20009C103
Person / Time
Site:	McGuire
Issue date:	05/19/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C104	List: 05000369/LER-1981-060, Forwards LER 81-060/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-060-03, /03L-0:on 810420,while in Mode 3,initial Fuel Loading,Channel 1 Cold Leg Injection Accumulator 1D Tank Level Indicator Fluctuated & Failed High.Caused by Faulty Transmitter.New Transmitter Installed & Calibr
References
NUDOCS 8107200288
Download: ML20009C103 (3)

LER-1981-060, Forwards LER 81-060/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981060R00 - NRC Website

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c Mr. James P. O'Reilly, Director

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Atlanta, Georgia 30303 JUL 171981 *

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'N Re: McGuire Nuclear Station Unit 1 Docket No. 50-369 6

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-60.

This report concerns the Cold Leg Insection Accumulator ID being declared inoperable. This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, h

William O. Parker, Jr.

- l RWO:pw Attachment cc: Director Mr. Bill Lavallee Otrice of Management & Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission Post Office Box 10412 Washington, D. C.

20555 Palo Alto, California 94D3 Ms. M. J. Graham Resident Inspector - NRC McGuire Nuclear Starion of C #y/ [

8107200288 810519 PDR ADOCK 05000369 i

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McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number:

81-60 Report Dage: May 11, 1981

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Occurrence Date: April 20, 1981 Facility: McGuire Unit 1,.arnelius, N. C.

Identification of Occurrence:

Cold Leg Injection Accumulator ID was declared inoperable due to failed level instrumentation.

Condition Prior to Occurrence: Mode 3, Hot Standby Description of Occurrence: On April 20, 1981, at 0233 hours0.0027 days <br />0.0647 hours <br />3.852513e-4 weeks <br />8.86565e-5 months <br />, Channel 1 Cold Leg Injection Accumulator ID Tank Level Indicator fluctuated and then failed high. Annunciator alarm, "ACCUM TNK D HI/LO LEVEL" was also actuated. The Shif t Supervisor immediately declared the Cold Leg Injection Accumulator ID inoperable. This placed the plant in a degraded mode of operation and was therefore reportable pursuant to Technical Specification 3.5.1.1.

Apparent Cause of Occurrence:

The Channel 1 level instrumentation for Cold leg Injection Accumulator 1D became scoperable because the appropriate level

ransmitter went bad.

~ Analysis of Occurrence: On April 20, 1981 at 0233 hours0.0027 days <br />0.0647 hours <br />3.852513e-4 weeks <br />8.86565e-5 months <br />, tha Reactor Coolant (NC) System was at 2235 psig and 557 F when Channel 1 Cold Leg Injection Accumulator ID Tank Level Indicator flactuated and then pegged high.

The Shift Supervisor immediately declared the affected channel in*)erable and 6

initiated a priority 1 work request for corrective maintenance.

It was found

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that the appropriate transmitter was bad and could not be repaired.

Since there was no available spare for that type of transmitter (BARTON MODEL 396),

the Supervisor initiated a temporary requisition to transfer the Unit 2 transmitter to Unit 1.

Personnel tried to calibrate the transmitter several times but it failed due to bad internal components. During that time about 0923 hours0.0107 days <br />0.256 hours <br />0.00153 weeks <br />3.512015e-4 months <br />, the action time limit required by Technical Specification 3.5.1.1 had expired, so cool down was started in order to decrease tha NC system pre-sure to less than 1000 psig.

On the afternoon of April 21, 1981, the trans-mitter was fixed, valved in and calibrated.

The Cold Leg Injection Accumu-lator ID was declared operable at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> on April 21, 1981.

Safety Analysis

Each of the four accumulator tanks have two independent level transmitters with their appropriate receiver gauges in the Control Room. When Channel 1 instrumentation for accumulator ID was inoperable, the other channel was functioning properly and its rectiver gauge was indicating the normal tank level.

If the accumulator had been needed during that time, j

it would have functioned as designed.

Hence, the safe operation of the plant i

and the health and safety of the public were not affected.

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2 Report Number 81-60 Page 2

Corrective Action

A priority 1 work ' request was initioted immediately to I

provide the necessary corrective maintenance on the affected channel.

The NC system pressure was decreased below 1000 psig when the time limit speci-fled in the action statement of Technical Specification 3.5.1.1 expired without placing the affected level instrumentation back in service.

A similar type of transmitter was removed from Unit 2 and installed for Channel 1 level instrumentation for accumulator ID.

The transmitter was I

calibrated and the Cold Leg Injection Accumulator was declared operable on April 21, 1981 at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />.

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