05000281/LER-1980-022-03, /03L-0:on 800826,w/unit Operating at Steady State, Channel III Flow Computer,For Steam Generator Steam Flow Fc 2474,failed.Caused by Loose Printed Circuit Board & Cold Solder Joint on Filter Capacitor.Board & Capacitor Repai

/03L-0:on 800826,w/unit Operating at Steady State, Channel III Flow Computer,For Steam Generator Steam Flow Fc 2474,failed.Caused by Loose Printed Circuit Board & Cold Solder Joint on Filter Capacitor.Board & Capacitor Repaired

ML18139A549
Person / Time
Site:	Surry
Issue date:	09/25/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A548	List: 05000281/LER-1980-021-03, /03L-0:on 800826,while Attempting to Pressurize Accumulator B Using Normal Nitrogen Supply,Pressure Fell Below Allowable Limits.Caused by Leak & Low Pressure in Nitrogen Fill Header.Added Pressure to Sys & Repaired Leak 05000281/LER-1980-022-03, /03L-0:on 800826,w/unit Operating at Steady State, Channel III Flow Computer,For Steam Generator Steam Flow Fc 2474,failed.Caused by Loose Printed Circuit Board & Cold Solder Joint on Filter Capacitor.Board & Capacitor Repai ML18139A547
References
LER-80-022-03L-03, LER-80-22-3L-3, NUDOCS 8009300504
Download: ML18139A549 (2)

LER-1980-022, /03L-0:on 800826,w/unit Operating at Steady State, Channel III Flow Computer,For Steam Generator Steam Flow Fc 2474,failed.Caused by Loose Printed Circuit Board & Cold Solder Joint on Filter Capacitor.Board & Capacitor Repaired

Event date:
Report date:
2811980022R03 - NRC Website

text

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~5 REPORT DA.TE SO EVENT DA,E EVENT DESCRIPTION AND ?R08ASLE CONSEQUENCES@

/With the unit operating at steady state the Channel III flow com:puter for "A" steam

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!generator steam flow, FC 2474,failed causing a low indication on flow indicator FI 2474.i

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!The associated bi-stable was placed in the tripped mode pending repairs. This is a de-

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!graded mode of operation permitted by Technical Specification 3.7.A and is reportable

_TID 1as per Technical Specification6.6.22..b.(2}The redundant steam flow channel for "A" loop

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1was operational and p~ior to placing the bi-stable in the tripped mode could have prov-o Is I lided the required signal therefore the bealth and safety of the public were* not affected*lt a 9 so ill]

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CAUSE

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS*@

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I Upon investigation a loose printed circuit board and a cold solder joint on a filter JJJJ capacitor were found and repaired.

The system was calibrated & returned to service.

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ATTACHMENT 1 SURRY POWER STATION, UNIT II DOCKET ~O:

50-281 REPORT NO:

80-022/03L-0 EVENT DATE:

08-26-80 TITLE OF REPORT:

1.

Description of Event

FLOW INDICATOR FI 2474 FAILURE

- With the unit at 75% of rated power and stable, the Channel III flow computer for 'A' steam generator steam flow, FC-2474, failed causing a low indication on flow indication FI-2474.

This is a degraded mode of operation permitted by technical specification and is reportable per TS 6.6.2.b.(2)

2.

Probable Consequences and Status of Redundant Equipment:

The protection bi-stable was placed inthe tripped mode pending repairs.

The redundant steam flow channel for 'a' loop was operational and prior to placing the bi-stable in the tripped mode could have provided the required signal therefore the health and safety of the public were not affected.

3.

Cause

A cold solder joint was found in a multiplier divider filter capacitor and a printed circuit board was found to be loose.

4.

Immediate Corrective Action

The bi-stables for channel III, 'A' Steam Generator were placed in the tripped mode.

5.

Subsequent Corrective Action:

The Instrument Technician repaired cold solder joint and properly installed the printed circuit board.

The unit was calibrated and returned to service.

6.

Action Taken to Prevent Recurreance:

None

7.

Generic Implications:

None