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

/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

ML20023B489
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-83-016-03L-03, LER-83-16-3L-3, NUDOCS 8305050121
Download: ML20023B489 (2)

LER-1983-016, /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

Event date:
Report date:
2811983016R03 - NRC Website

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EV2NT DESOStPrioN AND PRoBAst! CONSEQUENCES h I With Unit 2 at 100%, the signal from

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The transmitter was declared inoperable. This is I.

o i,' i l contrary to T.S. table 3.7.2 and is reportable per T.S.-6.6.2.F.(1). The redundant 1_<

l f e isi I channels remained operable'and PT-2485 was placed in.the " trip" mode.

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ATTACHMENT 1 SURRY POUER STATION, UNIT NO. 2 DOCKET Noi 50-281 REPORT NO:

83-016/03L-0 EVENT DATE:

03-29-83 TITLE OF THE EVENT: PT-2-485 DRIFTED HIGH l

l 1.

Description of the Event i

With Unit 2 at 100% power, the signal from Loop B steam line pressure transmitter (PT-2-485) increased approximately 300 mv.

This is contrary to Technical Specification table 3.7.2 and is a degraded mode of operation

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permitted by T.S.3.7.A.

This is reportable per T.S.6.6.2.b. (1).

2.

Probable Consequences and Status of Redundant Equipment The steam lines and header are provided with three pressure channels each.

Steam header pressure greater than any steam line pressure by 120 psi on 2/3 channels will initiate a safety injection in order to mitigate the effects of a steam line break.

The other'two channels associated with the steam line remained operable

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and the failed channel's bistable was placed in the trip mode. Therefore, the health and safety of the public were not affected.

3.

Cause

The cause for the increased output cannet be determined. The shift in the transmitter output cannot be attributed to any physical changes in the surrounding environment. The performance of this transmitter since calibration on March 29, 1983 has been satisfactory.

4.

Immediate Corrective Action

The bistable for the affected channel was placed in the trip mode, 5.

Subsequent Corrective Action The pressure transmitter was subsequently calibrated ~to the correct values, tested satisfactorily by Periodic Test 2.6A and was returned to service. This i.

transmitter is scheduled to be replaced, during an upcoming outage, with an environmentally qualified transmitter.

6.

Action Taken to Prevent Recurrence None.

7.

Generic Implications None.