ML19256E507

LER 79-063/04T-0:on 791022,presence of Ag-110m Detected in Camp Canoy Oyster Samples.Caused by Fluctuations in Plant Operation.Procedure Mods & Personnel Reinstruction Instituted

ML19256E507
Person / Time
Site:	Calvert Cliffs
Issue date:	11/05/1979
From:	Eherts R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256E501	List: ML19256E500 ML19256E507
References
LER-79-063-04T, LER-79-63-4T, NUDOCS 7911070548
Download: ML19256E507 (2)

Text

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3c l L l@l 0 l 5 l 0 l 0 l 0 l 3 l 1 l 7 l@l 1 l 0 [2 l 2 l 7 l 9 }@l1 11 l 0 l 517 60 61 DOCK ET NUUBER 68 69 Ek ENT O ATE 74 75 REPORT D ATE 60 EVENT DESCRIPTION AND PROBABLE CONSEQUENCESh o 2 i The Oyster sanoles were collected on aucust 27,1979 from the Camo O 3 ; Conoy samolino location and analyzed for canra-emittina radionuclides I j

o ., , as required. The results of the analyses showed the cresence of Aa 110m O s I at 266 t 4" pCi/Kg (wet). The oyster sanples collected on the same l l

O 16 l date from the Kenwood Beach saroling location (the backaround j

o 7 [ location) showed ac-110m at f.4 cCf /Ko (wet).

0 8 l d50 CAUSE COYP. VALVE SYSTEV CAUSE SU8COCE SUSCODE CCCE CCCE Sb8COCE COVPCNENT CODE O 9 Iz l 21@ Lxj@ l Z l@ !z 12 Iz Iz 1212 l@ l zl@ l zl@ 18 19 20 7 8 9 to 11 12 f3 R EVISIC N SE OUENTI AL CCOURAENCE REPORT CODE TYPE N O.

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44 47 35 36 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I

I1 o lTha intenduction nf a mnra coneitive tachrimia hae ro Airari no un1 valvia for Aa-110m at less than or eoual to 4 pCi/Ka, Althouah radioactive i releases for the reportina period have been well within NRC reauirements, m

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, 3 ) the June Camo Conoy samole exceeded the new backoround by over a ft:t'or

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8 9 OTHERSTATUS ISCO RY DISCOVERY CESCRsPTION ST S  % PCWER N/A I La.J@l onuring nn-si+. %,m1, .J i s LIJ@ l ol si ol@l ACTtvlTY CO TENT LOCATfCN OF RELEASE RELEASED OF RELE ASE AVOUNT OF ACTIVITY N/A l N/A l 7

1 e 8 9 l Zl @ l 10Z l@l 11 44 45 80 PERSONNEL EXPOSURES

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80 qgr LOS$ OF OR DAMAGE TO FACILITY 43 .

TYPE DESCRIPTION I 1l98 ]9 Zl@l10 N/A 80 y

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LER N0. 79-63/4T DOCKET NO. 50/317; 50/318 EVENT DATE 10/22/79 REPORT DATE 11/5/79 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTION: (CONTINUED)

Based on the observed levels of Ag-110m during August 1979, for an average adult consuming one kilogram of oysters per year the dost.s to the GI Tract and Whole Body are estimated atm l.6x10-4 mrem / year andm 2.3x10-5 mrem /

year, resoectively. These are very small fractions of the allowable 25 rRem/

year (GI Tract) and 25 mrem / year (Whole Body) doses to members of the general oublic, (40 CFR Part 190 Environmental Radiation Protection Standards for Nuclear Power Operations) and are considered to be of no consecuence to the health and safety of the public.

CAUSE DESCRIPTION AND CORRECTIVE ACTION: (CONTINUED)

It is anticipated that actual releases of Ac-110m will fluctuate as a function of plant operational history. In addition, an effort has been made to minimize the release of Ag-110m to as low as reasonably achievable. This effort has involved procedure modifications and personnel reinstruction.

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