05000281/LER-1981-007-03, /03L-0:on 810114,at 100% power,PT-27 (Heat Tracing) Revealed Amp Readings for Panels 8 & 9 Circuits Were Below Acceptance Criteria.Caused by Excessive Temps Breaking Down Insulation.Defective Heat Tracing Replaced

/03L-0:on 810114,at 100% power,PT-27 (Heat Tracing) Revealed Amp Readings for Panels 8 & 9 Circuits Were Below Acceptance Criteria.Caused by Excessive Temps Breaking Down Insulation.Defective Heat Tracing Replaced

ML18139B076
Person / Time
Site:	Surry
Issue date:	02/13/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B074	List: 05000281/LER-1981-006-03, /03L-0:on 810114,at Full Power,C Safety Injection Accumulator Found to Have Boron Concentration of 1943 Ppm, 7 Ppm Below Required Limit.Caused by Leakage Through Check Valve 1-SI-144.Valve Isolated 05000281/LER-1981-007-03, /03L-0:on 810114,at 100% power,PT-27 (Heat Tracing) Revealed Amp Readings for Panels 8 & 9 Circuits Were Below Acceptance Criteria.Caused by Excessive Temps Breaking Down Insulation.Defective Heat Tracing Replaced ML18139B073
References
LER-81-007-03L-01, LER-81-7-3L-1, NUDOCS 8102200542
Download: ML18139B076 (2)

LER-1981-007, /03L-0:on 810114,at 100% power,PT-27 (Heat Tracing) Revealed Amp Readings for Panels 8 & 9 Circuits Were Below Acceptance Criteria.Caused by Excessive Temps Breaking Down Insulation.Defective Heat Tracing Replaced

Event date:
Report date:
2811981007R03 - NRC Website

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DOCKl:T NUMBER 68 69 EVENT DATE

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' ** <:80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

I With Unit No. 2 at 1QQ% power, PT-27 (beat trac:ing) re,realec;l t'b.at amp readiug& for Panels DI] I 8 and 9, circuits 20C were below the acceptance criteria stipulated in the PT, there-

[ill I fore, the BIT recirc was declared inoperative.

This event is contrary to TS 3*~3~'!;'.? bti.t.

D]J I permitted by T.S.3.3.B.10.

This event is reportable per T.S.6.6.2.b(2),.

The health and Q]I] I safety of the public were not affected.

SYSTEM

CAUSE

CAUSE COMP.

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• 37 40 41

• 42 43 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS@

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44 47 I))] _!The loss of heat tracing was due to excessbze temperatures breaking c;lm,:m tbe insvl ati on* I

• IJI] !The defective heat tracing was replaced and tested witbiD 2 hrs A *design chanee has IJil lbeen initiated to change the manner by which these borated lines are heat traced.

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ATTACHMENT I SURRY POWER STATION, UNIT 2 DOCKET NO:___

so:...2s1 REPORT NO:

81-007/03L-0 EVENT DATE:

01-14-81 e

EVENT TITLE:

BIT RECIRC INOPERATIVE DUE TO HEAT TRACING FAILURE:.

--

• 1-. * 'DESCRIPTION of EVENT:

• With Unit Two at 100% -power, PT-27C revealed that amp--readings-for----

circuit 20C in Panels 8 and 9 were below the acceptance.criteria stipulated

'in the PT.

The heat tracing circuits are intended to maintain a fluid temperature above that needed for flow.

Since both channels of heat tracing were inoperable, the Boron Injection Tank recirc. was declar.ed inoperable. -.This event is contrary to T.S.* 3.3.A~3., but* permitted *by T.S.3.3~B~10 fo~ a period-.

of 2 hrs.

This event is reportable per T.S. 6.6.2*.b.(2).

--* ________ 2.

PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMENT:

Continuous recirculation between the Boron Injection Tank and Boric Acid Tank ensures t'1at th~-- !3<>ron Injection Tank is full of concentrated boric acid at all times.

Continous BIT recirc flow was verified, no operations that would have diluted the BIT were conducted and the heat tracing was repaired within -the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Tech. Spec. limit (1.hr. and 43 min.).

Therefore the.health,and -safety of the public were not affected.

3.

CAUSE

The*heat tracing tapes were inoperative due to insulation.failure resulting from excessive heat.

-*. --- 4-~. IMMEDIATE CORRECTIVE ACTION*:

• --

• The immediate correc*tive"'action was. to verify recirc.. :flow-and- -initiate---- -*

repairs of the heat tracing.

• 5-." **-SUBSEQUENT CORRECTIVE ACTION-:-*

• The defective heat tracing tape was replaced and tested within the 2 hr.

---

--- - -* -time -span -specified -by--T-echnieal Specifications.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

No additional actions were deemed necessary~

___ J_. - GENERIC IMPLICATIONS:.

A task force has reviewed the to*tal spectrum of the Heat Tracing _system and _a Design Change is being __ prepared as a result of t~e T,a.sk For~e __ ~tudy. _ '!-,~ng lead items are being procured.

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