ML20010G693

LER 81-042/04T-0:on 810831,during Weekly Environ Radiation Monitor Insp,Only Six Monitors Found Functioning Due to Defective Power Supply Units.Cause Unknown.Portable Monitor Installed

ML20010G693
Person / Time
Site:	Nine Mile Point
Issue date:	09/10/1981
From:	Randall R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010G689	List: ML20010G688 ML20010G693
References
LER-81-042-04T, LER-81-42-4T, NUDOCS 8109220415
Download: ML20010G693 (1)

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f N RC F O R M 366 00. 6. EUCEE AR R EGUL'A9@CN N (7 77)

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OATE 80

,j 7 8 60 61 DOCKET NUMBER EVENT DATE I

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo l2l lDuring a weekly environmental radiation monitor surveillance inspection. it was found I

} lOl3l lthat only six monitors were functioning. Environmental tech specs require a minimum I

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g g pf seven. Of the total of ten runitors, four failed over a three day period. All l lOlsl ponitors had been functioning at the previous weekly check. There were ao adverse 1 lO is l ponsequences due to this esent. I Fl 77 I l I

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43 l G l 0 l 8 l 0 l{2q 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l1 l0l IEhe cause of this occurence was defective power supply units. The reason four out of I l i l i l ken monitors suffered power supply failures is unknown. A portable monitor was l l3 l7l l installed the following day to place the site in compliance with environmental tech l l

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I It 1411 80 7 8 9 STA S  % POWER OTHE R STATUS ISCOw RY DISCOVERY DESCRIPTION SURVEILLANCE TEST l1 l 5 l l E l@ l 1l 0l 0l@l NA l W @l l ACTIVITY CC TENT RELE ASEO OF RELE ASE AVOUNT 05 ACTIVITY LOCATION OF RELEASE l1 l6l[Zj h y gl NA l l NA l 44 45 80 7 8 9 to 11 PERSONNEL E KPOSURES Nt ivB E R TYPE DESCRIPTION j

l3 l 7 l l0 l0 p l@l Z l@l NA PERSONNEL INJURIES NUVBER DESCRIPTION NA l ITT l8 l9 o l o l o l@l12 7 11 80 LOSS OF OR DAMAGE TO F ACILtTY TYPE DISCRIPTION NA l li 191 "

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• Pu8ti$TY 810922041S 810910 NRC USE ONLY ,

ISSUE DESCRIPTIONb PDR ADOCK 05000220 lllllllllllllj l2l0l 8 9 hl TO NA s PDR l 68 69 80 &

(315)343-2110 1596 o Robert Randall PHONE: 7, NAME OF PREPARER