05000296/LER-1979-028-03, /03L-0:on 791218,while Performing SI,PS-3-74A & B & PS-68-95 (Reactor Pressure) Did Not Actuate at Correct Setpont.Caused by Drifting of Barton Model 288 & Barksdale B2T-M12SS.Switches Readjusted

/03L-0:on 791218,while Performing SI,PS-3-74A & B & PS-68-95 (Reactor Pressure) Did Not Actuate at Correct Setpont.Caused by Drifting of Barton Model 288 & Barksdale B2T-M12SS.Switches Readjusted

ML18024B262
Person / Time
Site:	Browns Ferry
Issue date:	01/15/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B260	List: 05000296/LER-1979-028, Forwards LER 79-028/03L-0 05000296/LER-1979-028-03, /03L-0:on 791218,while Performing SI,PS-3-74A & B & PS-68-95 (Reactor Pressure) Did Not Actuate at Correct Setpont.Caused by Drifting of Barton Model 288 & Barksdale B2T-M12SS.Switches Readjusted
References
LER-79-028-03L-01, LER-79-28-3L-1, NUDOCS 8001210215
Download: ML18024B262 (4)

LER-1979-028, /03L-0:on 791218,while Performing SI,PS-3-74A & B & PS-68-95 (Reactor Pressure) Did Not Actuate at Correct Setpont.Caused by Drifting of Barton Model 288 & Barksdale B2T-M12SS.Switches Readjusted

Event date:
Report date:
2961979028R03 - NRC Website

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. 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 During normal operation while pexforming ST. 4.2.B-7, PS-3-74AM'nd PS-68-95

{Reactor Pressure) did not actuate at the correct setpoint as required by T.S.3.2.b.

Opexable redundant systems wexe available.

There was no hazard to the public health or safety.

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~07 Previous occurrencies:

259/772, 259/7326, 296/7910, 259/7824, 296/7912, 296/797, 260/7917, 260/7916, 259/798.

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Qzs 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION ANDCORRECTIVE ACTIONS 27 A Barton model 288 and a Barksdale B2T-Hl2SS had drifted.

The switches were readjusted, functionally tested and returned to service.

A modification has been approved

{DCR 1398) to replace the switches with an analog system.

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l/10/79 LER SUPPLENENTAL INFORMATION BFRO 296 /

7928 Technical Specification Involvef'ate of Occurrence 1~218/79 Time of Occurrence 0800 Unit ~

Identification and Desc~ri tion'of Occurrence:

During SI Testing PS-3-74 A & B and PS-68-95 did not actuate at the correct setpoint.

Actual trip points: PS-3-74A SWIPl = 227.0 PSI, SWN2 = 444 PSI (TS limits SWgl = 243.57

+/- 15 PSI, SW82 = 463.57 +/- 15 PSI): PS-3-74B SWIPl = 215.0 PSI, SW82 = 478.0 PSI (TS limit SW81

= 243.57 +/- 15 PSI, SWN'2 = 463.57 +/- PSI):

PS-68-95 SW81= 207PSI, SWIP2 = 432.5 PSI (TS limit SW81 = 234.3 +/- 15 PSI, SWN'2 = 454.3 +/- 15 PSI).

Conditions

'P~ ior to Occurrence:

U-1 85.5%

U-2 Shutdown U-3 77%

Action specified in the Technical Specification Surveillance Requirements

".iet due tenno erabie e ui >ment.

Describe.

Instruments were recalibrated immediately.

No shutdown action was required.

l Apparent Cause of Occurrence:

Instrument drift.

Analysis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or injury and no danger to. health or safety of the public.

~

Corrective Action; Ihstruments were readjusted.

An increased monitoring for 1 week was xnxÃzafe~The Barksdale switch was replaced after it drifted again.

DCR 1398 has been approved to change the system to an analog system.

Failur~ Data:

259/772, 259/7326, 296/7910, 259/7824, 296/7912, 296/797, 296/7917, 296/7916 and 259/798

~Retention:

eriod - Lfetime; Responsibility - Administrative Supervisor

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