ML19337A329

LER 80-017/03L-0:on 800804,during Normal Power Operation, Personnel Discovered Setpoint Selector Switches for RMO-61, Particulate Radiation Monitor,In Wrong Position.Caused by Personnel Error While Performing Test on Radiation Monitors

ML19337A329
Person / Time
Site:	Fort Calhoun
Issue date:	08/25/1980
From:	Core M OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19337A323	List: ML19337A322 ML19337A329
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8009090536
Download: ML19337A329 (4)

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NRC FORM 364

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EVENT DESCRIPTtoN AND PROB ABLE CONSEQUENCES h t o 121 l During normal power operation, it was discovered by Operations personnel that the l ?

m setpoint selector switches for RM0-61, stack particulate radiation monitor, were 1 4 io i3 i I

-10 4i I set in the higher of the two setpoint positions. This position is normally used I io ioi i when temperature inversions exist. At the time of finding the switches in the l _

lo is i 1 wrong position, an inversion did not exist. Tech. Spec. 5.9.2(3) applies. I

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44 47 CAUSE DESCRIPTICN AND CORRECTIVE ACTIONS h 1i10ll The setooint selector switches were imediately set to the proper position and the l t i ii i i recorder chart was read to insure Technical Specification limits had not been I i,i2i 'l exceeded. The switches were left in the wrong position as a result of performing l

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iii3i I a routine surveillance test on the radiation monitors. I l

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NAME of DAEPARER 8009090 536

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LER No.: 80-017 ~

Omaha Public Power District {-

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Fort Calhoun Station Unit No.1

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ii Docket No.- 05000285 t

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-1 ATTACHMENT NO. 1 5 1 Safety Analysis RMO-61,-stack particulate radiatien monitor, has dual setpoints for  ?

both alert and alam. The higher set of setpoints is used when a temp- J erature inversion exists to account for increased background radiation  ?;

due to increased radon activity. Radon is naturally occurring radiation,  ;.

emitted from the earth's surface. When a temperature inversion exists radon, normally released by the earth to the upper atmosphere, is trapped near the earth's surface. Due to the trapping action of the inversion, ,i backgrocnd. activity _ can go as high as 2020 CPM, (rather than the nomal ,

60 CPM) thus causing the need for higher setpoints than those used in a 1 non-temperature inversion climate. With the selector switches set in '

the high setpoint position, Technical Specifications limits could have been violated if the conditions were normal background and normal line up of the ventilation-system. However, a review of the recorder chart for the time the switches were inadvertantly left in the high position revealed that the release rate did not exceed the rate allowed by the lower settings. Additionally, Technical Specification limits are sig-nificantly lower than the limit imposed by 10CrR20. The limits of 10CFR 20 could not have been violated in either switch position.

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LER No.80-017 Omaha Public Power District b Fort Calhoun Station Unit No.1 00cket No. 05000285

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ATTACHMENT NO. 2

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Corrective Action E

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The setpoint selector switches were inadvertantly left in the in-correct position after the performance of ST-RM-2, F.2, Process Monitor Checks surveillance test. The test has been revised with a sign-off to indicate that the switches have been returned to the proper position in ~

accordance with the presence of a temperature inversion. No further corrective action is anticipated. -

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I LER No.80-017 Omaha Public Power District i-

Fort Calhoun Station Unit No. 1 Docket No 05000285 1

ATTACHMENT NO. 3 Failure Data _ .

This is the first reportable occurance of its kind at Fort Calhoun Station.

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