ML19257A892

LER 79-080/04T-0:on 791218,discovered That Ag-11om in Oct Convoy Oyster Samples Exceeded New Background Value.Caused by Introduction of More Sensitive Technique Reducing Measured Discharge Level

ML19257A892
Person / Time
Site:	Calvert Cliffs
Issue date:	01/02/1980
From:	Eherts R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257A889	List: ML19257A888 ML19257A892
References
LER-79-080-04T, LER-79-80-4T, NUDOCS 8001090357
Download: ML19257A892 (2)

Text

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7 8 60 61 DOCK ET NUM8ER 68 69 EVENT DATE 74 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 Oyster samples collected on 10/30/79 from the Camp conov location and analyzed j O 3 I as required by Section 3.2, Appendix B, Environmental Technical Specifications, 1 0 4 fshow Aq-110m at 253 + 12 pCi/ko (wet). Background location showed An-110m i O 5 L at less than or eoual to 7 pCi/kg (wet). Based on the observed levels, average l ,

Lo_L6J l individual doses to the GI Tract and Whole Body are very small fractions of l y I the allowable doses to msnbers of the general public (40 CFR Part 190) and c a I are of no consequence to the health and safety of the public. I 7 g g 80 E CODE sVSC E COMPON ENT CODE sV8 DE s E O 9 Z l Z l @ [,X_J@ LZ_J @ l Zl Zl Zl Zl Zl Zl@ l Z l@ l Z l @

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36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i

O I The introduction of a more sensitive technioue has reduced the MDL value for I uj_.j Aq-110m. Although radioactive releases for the reporting period have been'well l m I within NRC reouirements, the October Camo Conoy samoles exceeded the new back-l_i_,u,,1 I oround value by over a factor of 10. It is anticioated that actual releases I i 4 I of Aa-110n will fluctuate as a function of plant operational history. l

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' NAME OF PREPARER R. F. Eherts PsoNs; (301123a-7041 2,

LER NO. 79-80/4T DOCKET NOS. 50-317 50-318 EVENT DATE 12/18/79 REPORT DATE 1/2/80 ATTACHMENT ,

CAUSE DESCRIPTION AND CORRECTIVE ACTION: (CONTINUED)

Based on the observed levels.of Ag-110m during this sanpling period for an average adult consuming one kilogram of oysters per year the doses to the GI Tract and Whole Body are esti. mated at essl.5 x 10-2 mrem / year and /s-2.2 i 10 0 mrem / year respectively. These are very small fractions of the allowable 25 mrem / year (GI Tract) and 25 mrem / year (Whole Body) doses to members of -

the general public (40 CFR Part 190 Environmental Radiation Protection Standards for Nuclear Power Operatiors) and are, therefore, considered to be of no consequence to the health and safety of the public. .

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