ML18139B053

LER 81-009/03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 11 Circuit 4C.Caused by Short in Heat Tape.Defective Heat Tracing Replaced.Design Change Initiated

ML18139B053
Person / Time
Site:	Surry
Issue date:	01/30/1981
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B048	List: ML18139B047 ML18139B049 ML18139B050 ML18139B051 ML18139B052 ML18139B053
References
LER-81-009-03L-02, LER-81-9-3L-2, NUDOCS 8102050589
Download: ML18139B053 (2)

Text

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With Unit No.2 at 100% power, PT-27A revealed that amp readings for Panel 11. circuit 4C was below the acceptance criteria stipulated in the PT. This event is contrary to T.S. 3.3.A.4 and is reportable per T.S.6.6.2.b.(2). The redundant heat tracing circuit was operable, therefore, the health and safety of the public were not affected.I

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QTI] The loss of heat tracing was due to a short in the heat tape, The defective heat tracint

JI[] was replaced and tested. A design change has been initiated to change the manner by which these borated lines are heat traced.

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. ..., ATTACHMENT 1 e SURRY POWER STATION, UNIT NO. 2 e

DOCKET NO: 50-281 REPORT NO: 81-009/0JL-0 EVENT DATE: 01-05-81

. TITLE OF EVENT: HEAT TRACING FAILURE

1. DESCRIPTION OF EVENT:

With Unit No. 2 at 100% power, PT-27A revealed that the amp reading for Panel 11 circuit 4C (BIT Recirc. return) was below the acceptance criteria stipulated in the PT. This event is contrary to Technical Specification on 3.3.A.4 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 the needed for flow. The redundant heat tracing circuit was operable, there-fore, the health and safety of the public were not affected.

3. CAUSE:

The loss of heat tracing was due to a short in the heat tape. Arcing had severly damaged the heat tape preventing any conclusive evalution.

4. IMMEDIATE CORRECTIVE ACTION:

The immediate 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:

.N.o .,addi.tional actions were* deemed-*necessa*ry.

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 study. Long lead items are being procured.

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