ML20028G377

LER 83-001/03L-0:on 830101,during Reactor Bldg Purge,Station Radiation Monitor RM-A9,iodine Channel,Failed.Caused by Single Channel Analyzer Circuit Board Failure.Circuit Board Replaced & Quarterly Calibr Performed

ML20028G377
Person / Time
Site:	Three Mile Island
Issue date:	02/01/1983
From:	Stephenson C GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028G376	List: ML20028G375 ML20028G377
References
LER-83-001-03L, LER-83-1-3L, NUDOCS 8302090175
Download: ML20028G377 (3)

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. - LICENSEE EVENT REPORT (PLE ASE PRINT 071 TYPE ALL REcul AED INFORMATION)

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[o l2l l During shutdown while RB Purge was in progress, station radiation monitor RM-A9, iodind l o l 31 l channel, failed. No significant occurrence took place. The particulate and noble gasl

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p ;4l l channels of RM-A9 were operable. No iodine above background was oresent since plant I t o l s t lhas been in cold shutdown since 1979. Public health and safety were unaffected. l I o Is l l Reportable per 6.9.2.B(2) -l l0 l7l l l l 0 l8 l l l EO 7 8 9 SYSTEM CAUSE CAUSE COYP. VALVE CODE CODE SUBCODE COMPONENT CODE SUECCOE SUSCODE g lB lB j@ ]@ lA l@ l I l N l S l T l R l U l@ lE l@ { @ 13 18 19 20 7 8 9 to 11 12 OCCURRENCE REFORT REV;SION

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LER S3-01

1. Current Activites at the Time of the Occurrence TET Unit 1 was in a long ter cold shutdown ccadition.

II. _Circu= stances Leading to the Occurrence At 0150 on 1/1/83 RM-A9 Iodine channel, which =enitors the Reactor Building purge effluent, failed. A Reactor Evilding purge was in progress at the time.

Shortly bef ore the f ailure a routine source check of the Iodine channel' had been satisfactorily perfor=ed.

III. Descriotion Per action statement 31 of Tech. Spec. Table 3.21-2 the purge which was in regress =ay centinue for up to 28 days, provided that, within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> af ter the channel has been declared inoperable, sanples are continuously collected with auxiliary sa=pling equip =ent. The Reactor Building purge was ter=inated at 0155 hours0.00179 days <br />0.0431 hours <br />2.562831e-4 weeks <br />5.89775e-5 months <br /> on 1/1/83, within the required 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

While RM-A9 Iodine channel was out ef- service the =ini=u= nu=ber of oper.able

. cha=nels was less than that required by Tech. Spec. 3.21-2. This ite: is -

considered reportacle under Technical Specificatien 6.9.2.3.(2) as cperation in a degraded mode per=itted by a li=iting ccndition f or operation.

IV. Resultar.t Event No significant occurrence took place as a result cf this event. The particulate and gas channels cf RM-A9 were cperable during the purge. No iodine above background was present since the plant has been in cold shut-down since 1979.

V. Previous Events of a Si=ilar' Nature .

LER 82-07.

VI. Root Cause Failure of RM-A9 iodine single channel analyzer circuit board.

VII. I==e diate Corrective Actien'

!=nediate ccrrective action was to secure the purge within the required time fra=e. An investigation revealed that the single chuanel analyzer circuit board of RM-A9 iodine channel had f ailed. The circuit board was l- -

LIR 83-01 (Continued) replaced and S? 1302-3.1, PES Quarterly Calibratien, was perfor=ed to essure the channel was functioning properly following repair.

VIII. Lone Term Corrective Action No additional ecErective action is required for this isolated case of conpenent f ailure. .

IX. Cocponent Failure Data Victoreen single channel analyzer circuit board, part number 842-3-6.

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