05000293/LER-1979-041-04, /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

/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: 05000293/LER-1979-041, Forwards LER 79-041/04T-1 05000293/LER-1979-041-04, /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
References
LER-79-041-04T, LER-79-41-4T, NUDOCS 7912180637
Download: ML19260C153 (2)

LER-1979-041, /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

Event date:
Report date:
2931979041R04 - NRC Website

text

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

l l

l l lh (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

l M l A j P l P l S l 1 l@l 0 l 0 l - l 0 l 0 l O l 0 l 0 l - 0l0 @l4 1l1l1l1l@l l@

lo 1

7 8 9 LICENSEE CODE le 15 LICENSE NUMSEH 25 26 LICENSE TYPE JO 57 CAT 68 CON'T E'n"y X @ 0 ] 5 l 0 l - l 0 l 2 l 9 l 3 @l 1 l 1 l 1 19 l 7 l 9 l@ 112 l 1 l 1 l 7 l 9 l@

o 1

7 8

60 61 DOCKET NUMB ER 68 69 EVENT DATE 74 75 REPORT DATE 80 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

l Xl X lh

@ lZ @ l Zl Zl Zl Zl Zl Zl@ l 2l@ l Zlh O

9 7

8 9

10 11 12 13 18 19 20 SEcuENTIAL OCCURRENCE REPORT REVISION

_ EVENT YEAR REPORT No.

CODE TYPE N O.

@ y"LE R ROl7 l9 l l_

l0 l4 1l l/l 10 l4l lTl l-l l1 l E

U 21 22 23 24 26 27 28 23 30 31 32 TAK N AC ON O PL NT MET HOURS S8 iT FOR b 8.

SUPPLIE MANUFACTURER IZ l@lZ l@

l Zl@

[.Zj@

l 01 010 0l l Yl@

l Nl@

lZ l@

lZ l9 19 9l@

33 34 35 36 3/

40 41 42 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 i !4 l

l 80 7

8 9 STA S 4 POWER OTHER STATUS DIS Y

DISCOVERY DESCRIPTION 32 N.A l

l Dlgl NOTIFICATION BY ENVIRONMEN uL LAB l

C l@ l 1 0 0lgl i s ACTIVITY CO TENT OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE RELEASE @D Zl@l lZl N.A.

l l

N.A.

l 1

6 PERSONNEL EXPOS ES NUMBER TYPE

DESCRIPTION

l0l0l0l@lZl@l N.A.

l 1

7 PERSONNEL INJURIES NUV8ER

DESCRIPTION

N.A.

l l0 0l0l@l i

a 7

8 9 11 12 SO es ' =^PWr^"" @

1614

.526 E

lZl@l N.A.

1 9

7 8 9 10 80 7D1218 0 837 ISSuEf@oe CRiPriON@

~ * " ' "

NRC USE ONLY l N_

l v. t l

IIIIIIIiiIIIl; 2

o 7

8 9 10 68 69 80 ;

617-746-7900

{

C. G. Whitney PHONE:

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.

1614 327