ML18139B389

LER 81-033/03L-0:on 810518,amp Reading for Heat Tracing Panel 8,circuit 6A,found Below Acceptance Criteria.Caused by Excessive Heat.Tracing Replaced & Tested.Design Change Initiated

ML18139B389
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-81-033-03L-02, LER-81-33-3L-2, NUDOCS 8106090568
Download: ML18139B389 (2)

Text

• NRC FORM 266 "LICENSEE EVENT REPORT es, N.UCL.i:.AR REGULATORY COMMISSION

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\.!) IV I A I s l pl s I 2 101 0 ! 0 I -j O I Pl 01 01 01 -! O! 0 IG)l 4 11 111111101 I I© S 9 L.IC:ENS!:E COO: 14 15 LIC:ENSE NUMBEFi . 25 . 26 LIC:ENSE 'iYPE ;JO 57 C:.I.T 5S CON'i [IT:Q ; s LI© j O ! 5 I O I O ! 0 I 2 ! B ! l GI 0 SO 61 DOCKET NUMBER 6S 69 js 11 \s Is 11 1©1° 1 6 1° !5 IB 11 IG) EVENT CATE 74 75 REPORT CATE 80 EVENT DESCRIPTION AND PROBABI..E CONSEQUENCES@

J With Unit No. 2 at 100~~ power, PT-27C revealed*

that amn readin2 for beat tracing [llJ . .l Panel 8, circuit 6A was below the acceptance criteria stipulated in the PT. This [[ill I event is contrary to T.S, 3.3.A.4 and is reportable per T.s.6--:6.2.b(2).

The J ___ .. .. [I]]] .I redundant heat tracing circuit was operable, therefore,*

the health and safetv of the l_ IillJ [IT] P ublic were not affected*.*

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• 36 37(.;:;\ * . 40 41 42 W@ :J TI 1 Is I s*J@ 43 .. 44 47 ,* CA.USE DESCRIPTION AND ~ORRECTIVE ACTIONS [I]]] I The loss of heat tracing was due to excessive heat. The defective heat tracine; IWS DJJ] I replaced and tested. A design change has been initiated to change the manner by which these borated lines are heat traced, o:::u::]'IL------------------------~------------------~-----------------..----------

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ATTACHMENT 1 SURRY POWER DOCKET NO: REPORT NO: EVENT DATE: -STATION, UNIT NO. 2 50-281 81-:-033/03L-0 05-18-81 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 8, circuit 6A (BIT recirc. return line) 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, therefore, the health and safety of the public were not affected, 3. CAUSE: The loss of heat tracing was due to excessive heat. 4. IMMEDIATE CORRECTIVE ACTION: The -immediate corre.ctive action was to verify.,thaL, 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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