05000324/LER-1981-015-03, /03L-0:on 810207,low Level Switch 2-B21-LIS-N031D-3 Actuated at -49.6 Inches Simulated Reactor Level.Caused by Switch Rubbing on Instrument Magnet Preventing Accurate Indication & Switch Actuation

/03L-0:on 810207,low Level Switch 2-B21-LIS-N031D-3 Actuated at -49.6 Inches Simulated Reactor Level.Caused by Switch Rubbing on Instrument Magnet Preventing Accurate Indication & Switch Actuation

ML19350A758
Person / Time
Site:	Brunswick
Issue date:	03/05/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350A757	List: 05000324/LER-1981-015, Forwards LER 81-015/03L-0 05000324/LER-1981-015-03, /03L-0:on 810207,low Level Switch 2-B21-LIS-N031D-3 Actuated at -49.6 Inches Simulated Reactor Level.Caused by Switch Rubbing on Instrument Magnet Preventing Accurate Indication & Switch Actuation
References
LER-81-015-03L-01, LER-81-15-3L-1, NUDOCS 8103160765
Download: ML19350A758 (2)

LER-1981-015, /03L-0:on 810207,low Level Switch 2-B21-LIS-N031D-3 Actuated at -49.6 Inches Simulated Reactor Level.Caused by Switch Rubbing on Instrument Magnet Preventing Accurate Indication & Switch Actuation

Event date:
Report date:
3241981015R03 - NRC Website

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g land Functional Test, PT 3.1.7PC, low level switch, 2-B21-LIS-NO31D-3, Model No. 4418C,1 g l actuated at -49.6" simulated reactor level while the reportable limit is <-38" simu-l 0 s l lated level. This event did not affect the hea2.th or saf ety of the public.

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33 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O lThe switch was rubbing on the instrument mannet ereventine an accurate indication nna I l switch actuation. The switch was readjusted and the instrument was ca14hr,ead m,a I

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g The switch-to-magnet position of the other similar level instm-1 g ments of both units were checked with no problem found. This is considered an iso-I g ;1ated event.

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LER ATTACHMENT - RO #2-81-15 Facility: BSEP Unit No.

2 Event Date: February 7, 1981 The !nstrument switch to magnet adjustment was such that the switch rubbed against the magnet during part of the magnet's rotational travel. As a result the instrument indication and switch actuation lagged behind the applied pressure. The switch was readjusted to allow free tisvel of the magnet and the instrument was calibrated and returned to service. This type of level instrument will be replaced with analog-type instrumentation during a future outage. These instruments are functional checked monthly and calibration checked quarterly.

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