ML20078D522

Nonroutine Environ Operating rept,Jul-Aug 1983

ML20078D522
Person / Time
Site:	Calvert Cliffs
Issue date:	09/26/1983
From:	Fuhrman G BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8310040542
Download: ML20078D522 (2)

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BALTIMORE GAS AND ELECTRIC CHARLES CENTER . P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING g g g DEPARTMENT 5b"2K7 BC-3J.8 The Regional Administrator U.S. NRC Region 1 631 Park Avenue King of Prussia, PA 19h06

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos. 1 and 2 License Nos. DPR-53 and 69 Nonroutine Radiological Environmental Operating Report This report is submitted to comply with the requirements of Appendix B Environmental Technical Specification Section 5.6.2.b.

Oyster samples were collected during August, 1983 from the Camp Conoy sampling location and analyzed for gamma-emitting radionuclides as required. The results of the analyses showed the presence of Ag-110m concentration of 118 + 8 pCi/Kg(wet). The oyster samples collected during the same period from the Kenwood Beach sampling location (the background location) shoved Ag-110m concentration of 11.8 pCi/Kg(vet).

The release rate of radioactive effluents during the period of interest was less than 5% of the allowable release limit specified in the Environmental Technical Specification (ETS) Section 2 3 Liquid Effluents, Specification A.7 The maximum concentration of Ag-110m in the effluent prior to discharge into the Bay was less than 0.002% of the limit specified in 10 CFR Part 20, Appendix B, for unrestricted areas.

Oysters have a natural tendency to highly bioconcentrate environ-mental silver. As a result of the bioconcentration, oyster muscle tissue show radioactive silver at levels observed in samples collected during 1983 It should be pointed out that Camp Conoy samples for the third quarter show a decrease in Ag-llom concentration of about 45% compared to the second quarter. samples. This reduction in Ag-110m concentration is probably largely due to depuration.

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For the period of interest in 1983, the monthly percent capacity factors for both Units were as follows:

Period Unit 1 Unit 2 July 1983 96.17 94.87 August 1983 88.49 71 95 r 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 radvaste 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 e . ,. _ jn j e y dwast,e,, tle,_ Q li % ts a g e,ll,as,,thg e_stablp h,ed QRA ,oJQectives.

Using the circulating-water-pump data for the period of interest, it is estimated that at the maximum release rate the radwaste concentration is decreased at least by a factor of about 1 x 10h prior to discharge into the Bay.

Based on Ag-110m concentration observed in oyster samples for the third quarter of 1983, the potential total doses to the Gl-Tract and the Whole Body of a maximum 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) are estimated at less than 0.04 mrem and less than 0.6 x 10-b mrem, respectively.

These doses are small fractions (the total potential dose is less than 0.2%) of the permissible limit of 25 mren/ year to members of the general public as set forth in h0 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 ours,

.Y o

Gary R. Fuhrman, Director Environmental Studies & Monitoring GRF/mgl cc: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 Dr. Randy A. Roig Power Plant Siting Program Sate of Maryland Mr. R. E. Architzel NRC Resident Inspector Calvert Cliffs l

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