05000293/LER-1981-030-04, /04T-0:on 810603,lab Rept Indicated Concentration of Co-60 in Mussel Taken from Discharge Canal/Outfall on 810505.Caused by Improved Analytical Techniques,Detecting Sensitivities Below Capabilities Specified in Tech Specs

/04T-0:on 810603,lab Rept Indicated Concentration of Co-60 in Mussel Taken from Discharge Canal/Outfall on 810505.Caused by Improved Analytical Techniques,Detecting Sensitivities Below Capabilities Specified in Tech Specs

ML20009E838
Person / Time
Site:	Pilgrim
Issue date:	07/16/1981
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009E830	List: 05000293/LER-1981-030, Forwards LER 81-030/04T-0 05000293/LER-1981-030-04, /04T-0:on 810603,lab Rept Indicated Concentration of Co-60 in Mussel Taken from Discharge Canal/Outfall on 810505.Caused by Improved Analytical Techniques,Detecting Sensitivities Below Capabilities Specified in Tech Specs
References
LER-81-030-04T, LER-81-30-4T, NUDOCS 8107280477
Download: ML20009E838 (2)

LER-1981-030, /04T-0:on 810603,lab Rept Indicated Concentration of Co-60 in Mussel Taken from Discharge Canal/Outfall on 810505.Caused by Improved Analytical Techniques,Detecting Sensitivities Below Capabilities Specified in Tech Specs

Event date:
Report date:
2931981030R04 - NRC Website

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r NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

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8 60 61 DOCK ET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE SJ EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 12 I I On June 3, 1981, Boston Edison received a report from Yankee Atomic Laboratory io l3 ! l indicating a concentration of Co-60 (84.8 t 2.5 pCi/KG) in a mussel taken from the ;

IO I4 l l discharge canal outfall on May 5,1981. This concentration is in excess of 10 times the measured concentration at the station in Marshfield (5.0 pCi/k),).

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r BOSTON EDISON COMPANY PILGRIM NUCLEAR POWER SIATION DOCKET No. 50-293 Attachment to LER 81-030/04T-0 On June 3, 1981, Boston Edison received an analysis report from the Yankee Atomic Environmantal Laboratory (YAEL) which indicated that a potentia]Iy reportable concentration of Co-60 (84.8 t 2.5) pCi/kg existed in a mussel sample collected from the Discharge Canal Outfall (indicator station) on May 5, 1981.

At this time (June 3,1981), the Mass. Division of Fisheries (DMF) was re-quested to collect a mussel sample from Green Harbor in Marshfield (control station) as soon as possible. The control station sample was collected on June 4, 1981.

The analysis report for the control station mussel sample was received from YAEL on July 6, 1981, and the Co-60 concentration in this 1

sample was the Lower L!mit of Detection (LLD) - 5.0 pCi/kg.

i The indicator station concent ation of Co-60 is in excess of 10 times the LLD of the control station in Marshfield. The Co-60 concentration in the indicator station sample is due to the operation of Pilgrim Station.

l The maximum dose to an individual ensuming seafood with this concentration of Co-60 ((84.8 t 2.5) pCi/kg.) for a full year would be only 2.2 x 10 3 mrem to the total. body (child) and 1.7 x 10-2 mrem to the most restrictive organ (Adult, GI-LLI). The above dos;s were calculated as per Regulatory Guide 1.209.

Clearly, the above calculated doses are not significant when compared to the natural background dose rate of about 80 mrem / year. Therefore, it is con-cluded that there is no risk to the health and safety of the public.

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