ML19260C153

LER 79-041/04T-1:on 791119,util Notified by Lab That Quarterly Composite Sample of Air Particulates Taken at Overlook Contained Co-60 in Excess of Tech Specs.Caused by Improved Analytical Techniques Sensitive to More Isotopes

ML19260C153
Person / Time
Site:	Pilgrim
Issue date:	12/11/1979
From:	Whitney G BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260C147	List: ML19260C146 ML19260C153
References
LER-79-041-04T, LER-79-41-4T, NUDOCS 7912180637
Download: ML19260C153 (2)

Text

UPDATE REPORT LICENSEE EVENT REPORT - PREVIOUS REPORT Nov. 28, 1979 CONTROL BLOCK:

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(PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo 7

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DATE 7 8 60 DOCKET NUMB ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

[TTTl l On November 19, 1979 Boston Edison was notified by Yankee Atomic Environmental 1 0 3 1 Lab that a quarterly (6/26 to 9/24/79) composite sample of air particulates taken l 0 4 l at the overlook area contained a level of CO-60 in excess of 10 times the control l O s l station level. The sample indicated 1012 E-5PCi/M3 compared to 90E-SPCi/M3 at the l O s l control. This would result in a dose of about 2E-2 mrem to any organ of a 1 0 7 l maximum exposed individual during the quarter. I o a l l 80 7 8 9 OE CODE SUSC E COMPONENT CODE SU8C DE SU E 7

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33 34 35 36 3/ 40 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l Improved analytical techniques have resulted in sensitivities for is, copes which l g are below detection capacilities specified in Technical Specification Table 4.8.4. I i 7 l Comparisons at these low levels resulted in a ratio greater than 10 which necessi- 1 1 3 l tated this report. I l

i !4 l 7 8 9 80 STA S 4 POWER OTHER STATUS DIS Y DISCOVERY DESCRIPTION 32 i s C l@ l 1 0 0lgl N.A l l Dlgl NOTIFICATION BY ENVIRONMEN uL LAB l ACTIVITY CO TENT OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 lZl RELEASE Zl@l@D N.A. l l N.A. l PERSONNEL EXPOS ES NUMBER TYPE DESCRIPTION 1 7 l0l0l0l@lZl@l N.A. l PERSONNEL INJURIES NUV8ER DESCRIPTION 7

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PHONE: 617-746-7900 C. G. Whitney NAME OF PREPARER {

O SUPPLEMENT TO LER 79-041/04T-1 On 11/19/79, Boston Edison received confirmation from the Yankee Atomic En-vironmental Laboratory which indicated that an elevated concentration of Co-60 existed in an air particulate quarterly composite sample taken from the Overlook Area (0.03 miles west of the Pilgrim Reactor Building) . The sample represented a composite of weekly samples taken from 6/26/79 to 9/24/79.

This level was in excess of 10 times the calculated Lower Limit of Detection LLD) at the control station in East Weymouth. The measured concentration of CO-60 at the overlook area was 1012 x 10-5 PCi/ Cubic Meter as compared to the LLD value of 90 x 10-5 PCi/ Cubic Meter at the Control Station.

This concentration does not present a significant source of exposure to any member of the public and would result in a maximum dose of about 2x10-2 mrem to any organ of a maximum exposed individual during the quarter.

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