05000281/LER-1983-015-03, /03L-0:on 830402,PT-27A Revealed That Amp Readings for Heat Tracing Panel 10 Circuit 1B & Panel 11 Circuits 2A, 4A & 6B Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Design Change Init

/03L-0:on 830402,PT-27A Revealed That Amp Readings for Heat Tracing Panel 10 Circuit 1B & Panel 11 Circuits 2A, 4A & 6B Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Design Change Initiated

ML20023B501
Person / Time
Site:	Surry
Issue date:	04/27/1983
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20023B487	List: 05000281/LER-1983-015-03, /03L-0:on 830402,PT-27A Revealed That Amp Readings for Heat Tracing Panel 10 Circuit 1B & Panel 11 Circuits 2A, 4A & 6B Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Design Change Init 05000281/LER-1983-016-03, /03L-0:on 830329,signal from B Steam Line Pressure Transmitter PT-2-485 Increased Approx 300 Mv,Rendering Transmitter Inoperable.Cause Not Determined.Basis Adjusted & Transmitter Calibr & Returned to Svc ML20023B486
References
LER-83-015-03L-03, LER-83-15-3L-3, NUDOCS 8305050130
Download: ML20023B501 (2)

LER-1983-015, /03L-0:on 830402,PT-27A Revealed That Amp Readings for Heat Tracing Panel 10 Circuit 1B & Panel 11 Circuits 2A, 4A & 6B Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Design Change Initiated

Event date:
Report date:
2811983015R03 - NRC Website

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6 60 Li DOCKET NUMegm 64 49 EVENT DATE 14 76 REPORT DATE 80 EVENT DESCRIPTION AND PROSABLE CONSECUENCES h ae2i l With Unit No. 2 at 100% power, PT-27A revealed that amp readings for heat tracing l

3 i3 ; ; Panel 10 circuit 1B and Panel 11 circuits 2A, 4A, 6B were below the acceptance l

io A; l criteria stipulated in the PT.

This event is contrary to T.S.3.2.B.5 and 3.3.A.4 1

( :,3; ; and is reportable per T.S.6.6.2.b.(2).

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i. o is 1 I operable, therefore, the health and safety of the public were not affected.

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r i i o i l The loss of heat tracing was due to excessive heat.

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3 ATIACHMENT 1 SURRY POWER STATION, UNIT NO. 2 DOCKET NO:

50-281 REPORT NO:

83-015/03L-0 EVENT DATE:

04-02-83 TITLE OF THE EVENT: HEAT TRACING FAILURE 1.

Description of the Event With Unit No. 2 at 100% power, PT-27A revealed that the amp readings for heat tracing panel 10 circuit 1B (MOV 1867) and Panel 11 circuits 2A, 4A, and 6B (Boron Injection Tank Inlet, Boron Injection Tank Recirculation Return, and Emergency Borate) respectively were below the acceptance criteria stipulated in the PT.

This event is contrary to Technical Specification 3.2.B.5 and 3.3.A.4 and is reportable per Technical Specification 6.6.2.b.(2).

2.

Probable Consequences and Status of Redundant Equipment

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

The redundant heat tracing circuits were operable,.

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

3.

Cause

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The loss of heat tracing was due to excessive heat.

4.

I=nediate Corrective Action 2

The immediate corrective action was to. verify that the redundant circuits were operable.

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Subsequent Corrective Action.

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l The defective heat tracing; tape was replaced and tested within the time span specified by Technical Specific.tions.

6.

Action Taken to Prevent Recurrence l

No additional actions were deemed necessary.

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7.

Generic Implications A task force has reviewed the cotal spectrum of the Heat Tracing System and a Design Change has been prepared as a result of the Task Force Study. The design change will be completed on Unit 1 CVCS prior to startup from the current refueling outage. Unit 2 CVCS will be completed during the forthcoming refueling outage.

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