05000325/LER-1981-030-03, /03L-0:on 810219 & 0317,switch 1 of Reactor Pressure Switch 1-B21-PS-N021D Model 288 Would Not Actuate. Caused by Switch Actuation Screw Out of Adjustment.Screw Adjusted After First Event.Linkage Adjusted After Second

/03L-0:on 810219 & 0317,switch 1 of Reactor Pressure Switch 1-B21-PS-N021D Model 288 Would Not Actuate. Caused by Switch Actuation Screw Out of Adjustment.Screw Adjusted After First Event.Linkage Adjusted After Second

ML20003D601
Person / Time
Site:	Brunswick
Issue date:	03/20/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003D598	List: 05000325/LER-1981-030, Forwards LER 81-030/03L-0 05000325/LER-1981-030-03, /03L-0:on 810219 & 0317,switch 1 of Reactor Pressure Switch 1-B21-PS-N021D Model 288 Would Not Actuate. Caused by Switch Actuation Screw Out of Adjustment.Screw Adjusted After First Event.Linkage Adjusted After Second
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8103270757
Download: ML20003D601 (2)

LER-1981-030, /03L-0:on 810219 & 0317,switch 1 of Reactor Pressure Switch 1-B21-PS-N021D Model 288 Would Not Actuate. Caused by Switch Actuation Screw Out of Adjustment.Screw Adjusted After First Event.Linkage Adjusted After Second

Event date:
Report date:
3251981030R03 - NRC Website

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. g l Test, PT 3.1.14PC, switch number 1 of reactor pressure switch,1-B21-PS-N021D, model l

On 3-17-81 during the functional test of this switch, l

g l number 288 would not actuate.

o s IPT 3.1.14P, it again would not actuate. This switch provides an open signal to the l

ILPCI injection valve and a RHR pump start at 410 psig + 15 psig in conjunction with l

o a ll RTTl l> 2 psig in the drywell. This event did not affect the health or safety of the public4 l o pl-l l Technical Specifications 3.3.3, 6.9.1.9b l

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i i l first event, the screw was readjusted and the instrument calibrated. declared ener-I g l able and' returned to operation. Following the 3-17-81 cvent, the switch actuation I

g l linkage was adjusted to provide a normal-operating band and the switch was Calibrated,l 1 declared operable and returned to operation.

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1 LER A'1TACHMENT - RO #1-81-30 Facility: BSEP Unit No.1 Event Date: 2-19-81 Both of these events resulted from the NO21D instrument switch number 1 actuation screw out of adjustment. After the first event the switch adjustment screw was readjusted and the instrument was recalibrated according to plant procedures and returned to service. Following the 3-17-81 cvent, an inves-tigation determined that the actuation. screw adjustment band was not sufficient to allow for operation of the switch within its calibration range, taking into-account normal instrument drift encountered by the. instrument..The switch actuation linkage and the switch actuation screw were then readjusted to allow sufficient linkage movement and reaction with the screw to permit calibration of i

the instrument closer to the center of its specified operating band. The switch was then tscalibrated and retu'rned to operation.

~ l, A review of the calibration records for this instrument shows that from 8-7-78 up to the 2-19-81 event, no switch out of adjustment or failure to operate events had occurred. This instrument is presently on a quarterly calibration and monthly functional test schedule to ensure proper maintenance and operation.

As a result of the 3-17-81 event, the N021D instrument will be calibrated weekly for the next month to ensure no further problems exist with its proper This and other similar instruments are scheduled to be replaced with operation.

anolog' type instrumentation during the next Unit No.1 outage, which is expected to prevent future occurrences.similar to that reported here.

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