ML20129E689
| ML20129E689 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 04/22/1985 |
| From: | Fuhrman G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8506060564 | |
| Download: ML20129E689 (2) | |
Text
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,a 7d' SALTIMORE OAS AND ELECTRIC
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CHARLES CENTER. P.O. BOX 1475 BALTIMORE. MARYLAND 21203 ELECTRIC ENGINEERING April 22, 1985 DEPARTMENT The Regional Administrator U.S. NRC Region 1 631 Park Avenue King of Prussia, PA 19406
Dear Sir:
SUBJECT:
Calvert Cliffs Nuclear Power Plant Units Nos. 1 and 2 License Nos. DPR-53 and 69 Nonroutine Radiological Environmental Operating Report This report is submitted in compliance with the requirements of the Old Environmental Technical Specification" (ETS), Appendix B, Section 5.6.2.b., with a review of the observed levels of Ag-110m in oyster samples
. collected during March 1985 In addition, we are providing an estimate of the potential dose commitment, based on the mean value of Ag-110m in oyster samples for the first quarter of this year.
Oyster samples were collected during March 1985 from the Camp Canoy sampling location, and analyzed for gamma-emitting radionuclides as required. The result of the analysis showed the presence of Ag-110m with a concentration of (153 + 7) pCi/Kg (vet). The oyster sample collected during the same period from Kenwood Beach sampling location (the background location) showed a Ag-110m concentration of less than 10 pCi/Kg (vet).
For the first quarter of 1985, the monthly percent capacity factors
(%) for both units were as follows:
Period Unit 1 Unit 2 January 1985 87 51 97 19 February 1985 96.00 98.69 March 1985 97 78 98.h4
- Since February 22, 1985 a new Technical Specification is valid for the CCNPP.
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'The Regional Administrator April 22, 1985 The release of the radioactive effluents during the period of interest was well within the allowable release limit specified in the Environmental Technical Specification, Appendix B, Section 2 3, Specifica-tion A.7, which is 2.5 Ci per unit (excluding tritium and noble gases) during any calendar quarter. The actual Ag-110m released in the liquid effluents during the third quarter of 1984 by both units was much below the specified limit.
The processed radwaste, from the combined waste processing system for Unit 1 and 2, was released into the circulating water prior to discharge from 10 GPM to a maximum of 120 GPM. In practice, the releases are made at a predetermined rate depending upon the measured concentration of the radionuclides in the radwaste, the Environmental
. Technical Specification limits as well as the established ALARA objectives.
Using the circulating-water pump data for the period of interest, it is estimatedthat,atthemaximumreleagerate,theradwasteconcentrationis decreased at least by a factor of 10 prior to discharge into the Bay.
Oysters have a natural tendency to highly bioconcentrate envi-ronmental silver. As a result of this bioaccumulation, oyster meat shows radioactive silver as observed in the sample collected during August 198h.
These levels are reportable on the basis of the Calvert Cliffs ETS exceed-ance criterion which is " ten times the background," where the background is the minimum detectable concentration in the control sample.
Based on the Ag-110m concentration observed in the oyster sample collected at Camp Canoy in March 1985, the potential total dose commitment to the GI-tract and to the whole body of a maximum exposed individual (with the consumption rate of 5 Kg/ year, and the dose conversion factors as at less than 4.6 x 10-2 mrem / year and less than 6.7 x 10 fT) is estimated recommended in the Regulatory Guide 1.109, Revision 1, 19 mrem / year, respectively.
These dose rates are small fractions ( 0.2% and 0.003% respec-tively) of the permissible limit of 25 mrem / year to members of general public as set forth in 40 CFR Part 190 " Environmental Radiation Protection Standards for Nuclear Power Operation," and are therefore considered to be of insignificant consequence to the health and safety of the public.
Very truly yo s,
[.t Gar R. Fuhrman, Director Environmental Programs MG/mg1 cc: Document Control Desk Dr. Randy A. Roig Mr. T. Foley a