ML20003G475

LER 81-010/04T-0:on 810407,rept Received Indicating Excessive Co-60 Concentration in Mussel Sample Taken from Discharge Canal.Cause Not Stated.Dose Insignificant When Compared to Natural Background Dose

ML20003G475
Person / Time
Site:	Pilgrim
Issue date:	04/21/1981
From:	Whitney G BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003G474	List: ML20003G473 ML20003G475
References
LER-81-010-04T, LER-81-10-4T, NUDOCS 8104290581
Download: ML20003G475 (2)

Text

U . $ N U C L E A F. R E G U L A T O R Y C C M'.EQ C'.

r. R C F C R M 3M DI7-LICENSEE EVENT REPORT

' (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIOW) coNincLstoCo1 l l  ! I I lh io l i j l' M I A l P I P l s l l l@l O ! Oi l OI of 01 oi 01 -l Oi Oj@l41111lilll@l I 67 C A I S8 j@

itCE*.SE b YBf8 26 UCf M TvPE 30 14  !$

E 9 LICEN5EE CCDE C ON'T

{1 d [ISlLj@lOl5l0 1 -l OL_2l 9 1 3)@!n Q 69 14 1017l8iljMplz.l? I 11 s i ! l@

Es ENT DATE 74 't P EPORT DATE 8; ,

7 b t4 El COC< ET N WWER EVENT DESCRIPTION Af.O PRCH1.BLE CONSEOUENCES report f hrom Yankee Atomic Laboratory j lo!?) lOn April 7, 1981, Boston Edison received a in indica ting a concentration of Co-60 (53.2 16 pCi/kg) in a mussel sample taken f rom ;

c la)

This exceeds the 10 t ires LLD a t the Control Station in j

g , ,, j ghe PNPS discharge canal. l (4. 8 pCi/kg) . The raxinum dose to an individual for a full year would j lo is] I Ma rsh fi el d.

o It is concluded j l0 }6 j l be only 1.07 x 10 ~ mrem to the most res t ric tive or gan (adult).

]

l o lij l that the re is no risk to the health and safety of the public.

1 lol811(See attachnent for full report. ) 90 COMP vatyg S Y 5T E M CAUSE CAUSE CQVPONENT CCCE SUSCCOE $U9 CODE CODE CODE SU9 CODE Lolel8 I xi xl@ l xl@ LzJ@ l z l z l z i zl zl zi@ LZJ@ LzJ @

9 10 11 12 13 18 19 20 REvlSiON 7

SEQUENTI AL OCCURRENCE REPORT CODE TYPE NO.

REPORT NO.

8 ,aj,Pg LER;RO

_ EVENT YE AR 1811 l [---J 23 l 0 l1l 0l26 24 y

27 l 0l 4 l 28 29 W

30

[--j 31 l0 l 32

_ 21 22 FOR B. 5 PPLI MANLFA RER ON PL ANT T HOUR $ $ BM O TA EN ACT ON lZj@]Zj@ lZl@ [Zj@

36 l 010l Of 0l40 31 W@

41 l42Nl@ W@ lZl9l9l9l@

43 44 47 33 J4 3$

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l c ) limproved analytical techniques have resul ted in sensitivities for isotopes which are I 1

li ) . J lbelow detection capabilities specified in Technical Specifications Table 4.8.4.

,, ,,, g Comparisons at these low levels resulted in a ratio greater than 10 which necessit- j j

,,,3j gated this report.

i Ii 141 I sn 7 8 9 05 0 RY DISCOVERY DESCRIPTION STA S  % POW E R OTHER STATUS N.A. lDl@l Noti fica tion by Environmental Lab. l l

li i s* l l C l@ 'l 1l 0l 0l@l" '*

Al-iviTv COOTENT LOCATION JF RELE ASE RELEasEo OF RE LE ASE AMOUNT OF ACTIVITY N.A. l l i 16 ) [ Zj @ (,Z_j@l N.A. l l 80 44 45 7 8 9 10 11 PERSONNE L Ex'OSURES NUMBER TYPE DE SCRIPTtCN n.^. I l1 l 71 ] 010 l 01@L_J@l '

, ERso~NEl',N,uLs NuveER OEsCRiPr>ON8 l N.A.

12 181Io10101@l 8 9 11 12 80 7

1.05S OF CR D AM AGE TO F ACILITY TYPE DE SC RIPTION N/

N.A. l li l918 9L7J@l 7 TO 80 DESCRIPTION I$$U E N.A. 1 ll1lIIIIIIIll1 v i ol LtJ81 68 69 80 3 0

k Mr. G. G. Whitney PHON E: (617) 746-7900 -.- S,

'rs 10 4 o 4g ()NAME OF PREPARER

w:w w-o BOSTON EDISCN COMPA'.T

/ PILGP.~M NUCLEAR PO'iEF. STATION DOCKET NO. 50-293 At tac'. : ent to LEE SI-010/04 T-0 l

On April 7,1981, Bosten Edison -received an analyses report from the Onkee Atomic Electric Laboratory which indicated that a reportable concentration of Co-60 (53.2 16 pCi/kg) existed in a russel sample taken f rom the Pilgrim Station Discharge Canal'on Parch 12, 1981. ,

This concentration is in ncess of 10 times the Lower Linit of Detection at the .

Control Station in Parshfield (LLD for Co-60 was 4.8 pCi/kg). l The raximum dose to an individual consuming seafood with this concentration for a full year would be only 1.4 x 10-3 nrem to the total body (child), and 1.07 x 10-2 nrem to the rest restrictive organ (adult GI-LLI). Clearly, this dose is not sig-nificant when corpared to the natural background dose rate of 80 to 100 nrem/ year.

Therefore, it is concluded that there is no risk to the health and safety of the public.

i I

i i

l 4

S i

e,- n-- . - - - . . _ , - , . - . , , - . . . - , - . - . - - . . - - - - . . . . _ - ---