ML18139B388

LER 81-022/03L-0:on 810514,amp Reading for Heat Tracing Panel 9,circuit 20C,found Below Acceptance Criteria.Caused by Excessive Heat.Tracing Replaced & Tested.Design Change Initiated

ML18139B388
Person / Time
Site:	Surry
Issue date:	06/05/1981
From:	WILSON J L VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B384	List: ML18139B383 ML18139B385 ML18139B386 ML18139B387 ML18139B388 ML18139B389
References
LER-81-022-03L-01, LER-81-22-3L-1, NUDOCS 8106090559
Download: ML18139B388 (3)

Text

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I With Unit No. 2 at 100% power, PT-27C revealed*

that amn readino for heat tracing .III!]. J Panel 9, circuit 20C, was below the acceptance criteria stipulated in the PT. This ([II] I event is contrary to T.S. 3.2.B.5 and is reportable per T.s: 6.6.2.b(2)

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heat tracing circuit was operable, therefore, the health* and safety of the J .. [£I[] I public were not affected, IITil L.....------------------------------------___..

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• CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @ D:I]J j The loss of heat tracing was aue to excessive heat. The defective heat trac;n2 was o:::IIJ replaced and tested. A design change has been initiated tq change tbe manner by !III! which these borated lines are heat traced. I 1-., _____________

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• ATTACHMENT 1 SURRY POWER STATION, UNIT No. 2 DOCKET NO: 50-281 REPORT NO: 81-022/03L-0 EVENT DATE: 05-14-81 TITLE OF EVENT: HEAT TRACING FAILURE 1. DESCRIPTION OF EVENT:

• With Unit No. 2 at 100% power, PT-27C revealed that the amp reading for heat tracing Panel 9, circuit 20C (".C" BAST recirc. line), was below the acceptance criteria stipulated in the PT. This event is contrary to Technical Specification 3.2.B.5, and is reportable per Technical Specification 6.6.2.b(2).

2. PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMENT:

The heat tracing circuits are intended to maintain a fluid temperature above that needed for flow. The redundant heat tracing.circuit was operable, therefore, the health and safety of the public were not affected.

3. CAUSE: The loss o:1; heat tracing was due to excessive heat. 4. U1MEDIATK CORRECTIVE ACTION: The irrnnediate corrective action was to verify that the redundant circuit was operable.

5. SUBSEQUENT CORRECTIVE ACTION: The defective heat tracing tape-was** replaced and tested within the time span specified by Technical Specifications.

6. ACTION TAKEN TO PREVENT RECURRENCE:

No additional actions were deemed necessary.

7. GENERIC IMPLICATIONS:

A task force has reviewed the total spectrum of the Heat Tracing system and a Design Change is being prepared as a result of the Task Force's study. Long lead items are being procured.

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