ML20083E758
| ML20083E758 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 11/28/1983 |
| From: | Fuhrman G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8312290397 | |
| Download: ML20083E758 (2) | |
Text
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r BALTIMORE GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE. MARYLAND 21203 ELECTRIC ENGINEERING U'"^"'"#"'
November 28, 1983 The Regional Administrator U.S. NRC Region 1 631 Park Avenue King of Prussia, PA 19406
Dear Sir:
SUBJECT:
Ce' vert Cliffs Nuclear Power Plant s
t.ucs Nos. 1 and 2 License Nos. DPR-53 and 69 Nonroutine Radiological Environmental Operation Report This report is submitted in compliance with the requirements of Appendix B Envircnmental Technical Specification Section 5.6.2.b.
Oyster samples were collected during October,1983 from the Camp i
dionuclides as
', Conoy sampling location, and analyzed for gamma-emitt ng ra required.
The results of the analyses showed the presence of Ag-110m with a concentration of 170 + 8 pCi/Kg(wet). The oyster samples collected during the same period from the Kenwood Beach sampling location (the background locatior.) showed a Ag-llos concentration of < 9 pCi/Kg(vet).
The release rate of radioactive effluents during the period of interest was less than 10% of the allowable release limit specified in the Environmental Technical Specification (ETS) Section 2.3 Liquid Effluents, Specification A.T.
The maximum concentration of Ag-110m, in the effluent prior to discharge into the Bay, was less than 0.003% of the limit specified in 10 CFR Part 20, Appendix B, for unrestricted areas.
Oysters have a natural tendency to highly bioconcentrate environ-mental silv'r.
As a result of this bioconcentration, oyster muscle tissue e
show radioactive silver as observed in samples collected during 1983 These levels are reportable on the basis of the Calvert Cliffs ETS exceedance criterion which is " ten times the background", where " background" is the
" minimum detectable concentration" in the control sample.
For the period of interest in 1983, the monthly percent capacity factors for both Units were as follows:
Period Unit 1 Unit 2 f)_) <
/
Sept. 1983 86.89 77 30 Oct. 1983 0
62.41 J U 8312290397 831128 PDR ADOCK 05000317 ih R
, l l
The Calvert Cliffs Unit 1 was shut down on October 1,1983 for planned maintenance work namely a general inspection / maintenance and refuelling.
Following completion of this planned maintenance work, Unit 1 is expected to be brought back on-line by early January, 1984.
The processed radwaste, from the combined waste processing system for Units 1 and 2, was released into the circulating water prior to discharge into the Bay.
The radwaste may be released at a design rate that can range 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 radionuclides in the radwaste, the ETS limits, as well as the established ALARA objectives.
Using the circulating-water-pump data for the period of interest, it is estimated that at themaximumreleaserate,tgeradwasteconcentrationis decreased at least by a factor of about 1 x 10 prior to discharge into the Bay.
Based on the Ag-110m concentration observed in oyster samples, the potential total dose commitment to the G1-Tract and the Whole Body of a maxi-mum exposed individual (with the consumption rate of 5 kilogram / year and the dose conversion factors as recommended in Reg. Guide 1.109, Rev. 1, October 1977) is estimated at about 0.05 mrem and less than 0.8 x 10-4 mrem, respectively.
These doses are small fractions (the total potential dose is about 0.2%) of the permissible limit of 25 mrem / year to members of the general public as set forth in 40 CFR Part 190 " Environmental Radiation Protection Standards for Nuclear Power Operations", and are therefore considered to be of insignificant consequence to the health and safety of the public.
Very truly yours, IC Gary R. Fuhrman, Director Environmental Programs GRF/few cc: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Dr. Randy A. Roig Power Plant Siting Program State of Maryland Mr. R. E. Architzel NRC Resident Inspector Calvert Cliffs
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