ML18139B308

LER 81-025/03L-0:on 810414,penetrant Test PT-27B Showed Low Amp Readings for Heat Tracing Panels 10 & 11,circuit 6A. Caused by Excessive Heat.Design Change Initiated

ML18139B308
Person / Time
Site:	Surry
Issue date:	05/08/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B307	List: ML18139B306 ML18139B308 ML18139B309
References
LER-81-025-03L, LER-81-25-3L, NUDOCS 8105150290
Download: ML18139B308 (2)

Text

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VENT D_ESCi=IIPTION AND PROEASl..E CONSEQUENCES@

I With Unit No.2 at 100% power, PT-27B revealed-that amp readings for heat tracing

((]JJ J Panels lQ & 11, circuit 6A,; were below the acceptance criteria s tipul_ated in the PT. _L __ __ ..

.[§JT].! This event is contrary to T.S.3.2.B.5 and is reportable per T.S. 6.6.2.b(2). The

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j 1 Io] J The _loss of heat tracing was due to excessive heat,

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ATTACHMENT 1 e e SURRY POWER STATION, UNIT 2 DOCKET NO: 50-281 REPORT NO: 81-025/03L-0 EVENT DATE: 04-12-81 HEAT- TRACING FAILURE

1. DESCRIPTION OF EVENT:

With Unit No. 2 at 100% power, PT-27B revealed that the amp readings for heat tracing Panels 10 and 11, circuit 6A (BAST to Blender), were 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 flow path through the blender was functionallv verified and the flow path from the RWST and the BIT were operable. Theref'ore, "-

the health and safety of the public were not affected.

3. CAUSE:

The loss of heat tracing was due to excessiv--e heat.

4. IMMEDIATE CORRECTIVE ACTION:

The immediate corrective action was to functionally test the affected flow path, commence a rampdown of the Unit and make inunediate repairs to one channel of heat tracing. One channel was- repaired and the power reduction secured in less than one hour.

5. SUBSEQUENT CORRECTIVE ACTION:

The redundant 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, I