ML19249A530

LER 79-029/04T-0 on 790710:Camp Canoy 790613 Samples Showed Higher than Normal Ag-110 Levels.Caused by Introduction of More Sensitive Sampling Technique

ML19249A530
Person / Time
Site:	Calvert Cliffs
Issue date:	07/23/1979
From:	Eherts R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19249A523	List: ML19249A522 ML19249A530
References
LER-79-029-04T, LER-79-29-4T, NUDOCS 7908230530
Download: ML19249A530 (2)

Text

"

• a T f A.i %6

. U. S. N UCL L AH H L G UL A T Oh Y LG".1.110510N (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

l l l l lh 6

(PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o i 8 9 lMiDjC]C Nl1lgl0l0 -l0l0l0l0l0l-l0 0l@l4l1l1l1l1 @l LICENSEE CODE 14 15 LICENSE NUV8ER 25 26 LICENSE TYPE JO l

$7 CAT $8 l@

CON'T 7

o i 8

$C l l@l 0 5j0l0l0l3l1l7l@l0[7[1l0l7l9}@l0l7l2l3l7 9l@

"

60 68 DOCK ET NUMB ER 68 69 EVENT DATE 74 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES O'o 1012] 1 0yster samples collected on 6/13/79 from the Camp Canoy location and analyzed I o 3 as required by Section 3.2, Appendix B, Environmental Technical Specification, l l o i,i l showed Ag-110m at 172 + 5% pCi/kg (wet). Background location showed Ag-110m I

o 3  ; at less than or equal to 5 pCi/kg (wet). Based on the observed levels, a,verage l 0 e individual doses to the GI Tract and Whole Body are very small fractions of I o ,  ; the allowable doses to members of the general public (40CFR Part 190) and l g g  ; are of no consequence to the health and safety of the public. l

" "^ '^"*

' C$'o'E COOE S 8CO0E COMPONENT CODE SL8 CODE S O E 7

O 9 8

I z i z i@ LX_J@ Iz i@ I zi zl zl zi zi zie i z i@ I z l@

9 to 11 12 13 18 19 20

_ SEQUENT! AL OCCURRENCE REPORT REVISION LER EVENT YE AR REPORT NO. CODE TYPE N O.

@ g, g.RO l7 19 l

_ 21 22 l-l 23 l0 12 19 l 24 26 l/l 27 10141 28 29 Ej 30 l-l 31 W

32 TAK N A T CN CN PL NT M T HOURS 22 S8 IT FOR 8. SLPPLIE MANUFACTLRER l3Jg g [34G J g l5z lg 3 [36zl@ 37 l0 l0 l0 lU l 4 40 lY@ l Nlg l z @ lz l9 l9 l9 lg 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS g[T] lThe introduction of a more sensitive technique has reduced the MDL value for I t i i, j Ag-110m at less than or eaual to 5 pCi/kg. This is a continuation of the i

, , igeneral trend of decreasing Ag-110m MDL for background sanoles. Althouah radio- l 3 3 active releases for the reporting period have been well within NRC reauirements, l

, 4  ; the June Camo Canoy samples excreded the new backgrcund value by over a factor (CONT); -

7 8 9 80 ST A S  % POWER OTHER STATUS DISCO RY DiSCOV ERY OESCRIPTION

'

i s

'

[EJQ l' 0 5l0l@'"

NA

"

l l B l@l Routir.e Off-Site Sample

" '

l A!TiviTv CO TENT Av0cNTOrACriviry @ ll LOCATION OF AELE ASE @

t s aE@t,asEo Os Rett ASE@ NA[ zjg NA J

7 8 9 10 11 44 45 80 PE ASCNNE L E EPO5URES yp 4 gy y NL*' A E R g ( 4 { k (g M z Na

'

i!7 l 0 l 0 l 0 l@ TYPE @[DESCRIPTIGN - l

' ' '

PEssONNEt Nw% ES NmER ctsCR;PTicNh i 3 0l0l0lgl NA l

7 8 9 11 12 tcss cs cn cAvaGE TO FaC:LiTv 8 Q '_

)

, 9 8 9

[gf "*"

to NA 19082305% 30 er E CE CR:PTICN 7

2 o 8 9 P iSI 10 NA i

68 69 l i i i i i i i i i i i ll30 ;

R. F. Eherts (301) 234-7941  ;

'. A VE OF P P E D AR E R FHCNE- 3

-

. n LER 79-29/4T DOCKET No. 50/317;50/313 EVENT DATE 7-10-79 REPnRT DATE 7-23-79 ATTA 'HMENT CAUSE DESCRIPTION AND CORRECTIVE ACTION: (CONT) of 10. It is anticipated that actual releases of Ag-110m will fluctuate as a function of plant operational history. However, in an intensive effort to minimize the release of Ag-110m to as low as reasonably achievable, procedure modifications and personnel reinstruction regarding the operation of the radio-active waste collecting system has been initiated.

.

• 2

'7/47,73