ML20204G469

Nonroutine Radiological Environ Operating Rept.During First Quarter 1983,sampling of gamma-emitting Radionuclides Indicated Presence of AM-110m W/Higher than Permitted Concentration

ML20204G469
Person / Time
Site:	Calvert Cliffs
Issue date:	04/21/1983
From:	Fuhrman G BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8305020509
Download: ML20204G469 (2)

Text

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BALTIMORE GAS AND ELECTRIC CHARLES CENTER . P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING DEPARTMENT April 21, 1983 I

The Regional Administrator U. S. URC Pegion 1 gg p) 691 Park Avenue King of Prussia, PA 19406

Subject:

Calvert Cliffs nuclear Power Plant Units Nos. 1 and 2 License Nos. DPR-53 and 69 Nonroutine Radiological Environmental Operating Eerort This report is submitted to ecmply with the requirements of Appendix B Envircnmental Technical Specification Section 5.6.2.b.

Oyster samples were collected during the first quarter of 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 with an average concentration of h6h kl pCi/Kg(vet). The oyster samples collected during the same period from the Kenwood Beach sampling l location (the background location) showed Ag-110m average concentration of j

1613 pCi/Kg(vet).

l l Radioactive releases in the first quarter of 1983 for all isotopes l have been within the allowable limits specified in the Environmental Technical l

Specifications (ETS). The natural tendency of oysters to highly concentrate environmental silver continues to be the cause of this event as was the cause of other similar events that were observed and reported during 1977-]982.

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

Period Unit 1 Unit 2 l January 1983 95 73 29.48*

February 1983 89 00 8h.68 March 1983 98.51 95.07

1. Unit 2 was brought back on-line on January 16, 1983 following completion of the plenned maintenance work, namely, general inspection, refueling and retubing of the condensers started on October 16, 1982.

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8305020509 830421

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"The Regional Administrator April 21, 1983 During operation of Units 1 and 2, the circulating-water-pump data logs show that, on the average, at least five pumps (each rated at 200,000 GPM) pe'r Unit were in operation. The processed radvaste from the combined vaste processing system for Units 1 and 2 was released into the circulating water prior to the 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 concen-tration of radionuclides in the radvaste, the ETS limits, as well as the estab-lished ALARA objectives. At the maximum release rate, the radvaste concentra-tion is decreased at least by a factor of 8 x 103 prior to discharge into the Bay.

Based on the average activity level of Ag-110m observed in oyster samples during 1983, the doses to the GI-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 0.15 mrem /yr and.approximately 0.2 x 10-3 mrem /yr, respectively. These doses are small fractions of the permissible limit of 25 mrem / 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 ind safety of the public.

Very truly yours, iM 0 a

a' s

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L ,%Of%Ah Gary 1R. Fuhrman, Director Environmental Studies & Monitoring GRF/eml cc: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 Dr. Steven M. Long Power Plant Siting Program State of Fhryland Mr. R. E. Architzel NRC Resident Inspector Calvert Cliffs