ML18139B387

LER 81-031/03L-0:on 810508,amp Reading for Heat Tracing Panel 11,circuit 1B,found Below Acceptance Criteria.Caused by Mechanical Damage to Tape.Heat Tracing Replaced & Tested. Design Change Initiated

ML18139B387
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-81-031-03L-02, LER-81-31-3L-2, NUDOCS 8106090548
Download: ML18139B387 (2)

Text

• NRC FORM 31;;6 -ICENSEE.

EVENT REPORT U.S. NUCL.EAR REGUL.ATORV COMMISSION r,. 7i'll .*

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l With Unit No. 2 at 100% power, PT-27C revealed that amp reading for heat tracing . Panel 11, circuit lB was below the acceptance criteria stipulated in the PT. IIm This everit is contrary to T. S. 3 ,3 .A. 4 and is reportable per-T, S. 6. 6. 2. b (2). 'T'he _l]J]J [§]]:] __ [ill] redundant.heat tracing circuit was operable, therefore, the health and safety of the L-...;;P.;;u;,;;;b.;;l;,;;;i:.;;c;....;.w;.;;e;,:r;.;;e;_;,n:.:o;.;;t:.....:a:.:f;.;f;.;e::.:c;;.;t;;.;e::.:d::..:...*

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• 42 lLJ@ *-IT 11**1s Is*!@) -*-CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @) DJ:[] l The loss of heat tracing was due _to mechanical damage to the-**tape, -, 4J

• 44 * '. ' 47 Personnel had been working in the near b'y area, !he defective heat tracing was replaced and test-[I]]] .ed. A design change has been initiated to change the manner by which these borated liries are heat traced. o:m 7 8 9 FACILITY /jo'I STATUS % "0WER . OTHER STATUS '.;::;:; iI1TI .LI@ __ I 1 l O I O l .... I _!_i/_A~---

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ATTACHMENT SURRY POWER DOCKET NO: REPORT NO: EVENT DATE:

• STATION, UNIT NO. 2 50-281 8l-031/03L-O 05-08-81 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 11, circuit 18 (BIT Outlet Valve, MOV-2867D), was below the acceptance criteria stipulated in the PT. This event is contrary to Technical Specification 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 that needed for flow. The redundant heat tracing circuit was operable, fore, the health and safety of the public were not affected.

3. CAUSE: The loss of heat tracing was du~to mechanical

~amage to the tape. Personnel from various crafts had been working .in the nearby area. 4. IMMEDIATE CORRECT I VE ACT I ON: The immediate corrective action was to verify that the redundant circuit was opera9le.

5. SUBSEQUEST 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 ttems are being procured.