ML20076E905
| ML20076E905 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/11/1983 |
| From: | Fuhrman G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8308250099 | |
| Download: ML20076E905 (2) | |
Text
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e BALTIMORE GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING DEPARTMENT 4
August 11, 1983 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 to comply with the requirements of Appendix B Environmental Technical Specification Section 5.6.2.b.
Oyster samples were collected on June 14, 1983 from the Camp Conoy sampling location and analyzed for gamma-emitting radionuclides as required. The results of the cnalyses showed the presence of Ag-110m concentration of 21h 1 10 pCi/Kg(vet). The oyster samples collected the same day from the Kenwood Beach sampling location (the background location) showed Ag-110m concentration of 19 1 5 pCi/Kg(wet).
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.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 silver. As a result of the bioconcentration, oyster muscle tissue show radioactive silver at levels 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 " mini-mum detectable concentration" in the control sample.
For the period of interest in 1983, the monthly percent capacity factors for both Units were as follows:
f%)
8308250099 830811 PDR ADOCK 05000371 R
PDR C
$0
.=
s.
w Peri od Unit 1 Unit 2 i
April 1983 80 91 99.44 May 1983 99 05 94.96 June 1983 87.60 96.6h i
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) per Unit were in operation. The processed radvaste from the combined waste processing system for Units 1 and 2 was released inta the circulating i
vater prior to discharge into the Bay.
The radvaste may be released at a design rate that can range from 10 GPM to a maximwn of 120 GPM.
In practice, the releases are made at a predetermined rate depending upon the measured l
concentration of radionuelides in the radvaste, the ETS limits, as well as l
the established ALARA objectives. At the maximum release rate the radvaste concentration is decreased at least by a factor of about 8 x 103 prior to discharge into the Bay.
Based on Ag-110m concentration observed in oyster samples for the second quarter of 1983, the potential total deses to the G1-Tract and the 3
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 than 1.0 x 10-4 mrem, respec)tively.
1.109, Rev. 1, October 1977 are estimated at less than 0.07 mrem and less These doses are amall fractions (the total potential dose is less 4
than 0 5%) of the permissible limit of 25 mrem / year to members of the general public as set forth in LO CFR Part 390 " Environmental Radiation Protection i
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, oA.c s
1 Ga R. Fuhrman, Director Environmental Studies & Monitoring GRF/few l
cc: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 Dr. Randy A. Roig Power Plant Siting Program State of Maryland
{
Mr. R. E. Architzel NRC Resident Inspector i
Calvert Cliffs i
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