ML20107J137
| ML20107J137 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/19/1984 |
| From: | Fuhrman G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8411090386 | |
| Download: ML20107J137 (3) | |
Text
.
BALTIMOFl?.
GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTaic ENGINEERING DEPARTMENT
(
October 19, 1984 The Regional Administrator
.U.S. HRC 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 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 August 1984.
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 three quarters of this year.
Oyster samples were collected during August 1984 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 concentra-tion of (135 + 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 9 pCi/Kg (wet).
For the third quarter of 1984, the monthly percent capacity factors for both units were as follows:
Period Unit 1 Unit 2
['
July 1984 95 90 55.58
~
August 1984 84.62 80.42 September 1984 96.36 74.445 8411090386 841019 PDR ADOCK 05000317 2
S PDR df 89
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The Calvert Cliffs Unit 2 -vas shut down on April 21, 1984', for its:
planned fifth refueling 'and maintenance. work. Following completion of this:
work, Unit'2 was brcught back on line~on July.~18,-1984.
The! release of the radioactive effluents during:the perio'd'of
-interest was well within the allowable release limit specified in thel Environ-mental Technical Specification, Appendix B,:Section 2.3, Specification A.7, which is-2.5 Ci per unit (excluding tritium and noble gases) during any cal-
-endar. quarter. The actual Ag-110m released in the liquid effluents during the third ' quarter of 1984. by both units was 3.17 x 10-2 C1, representing 0.8%
- of 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 radio-nuclides.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 estimated that, at the maximum regease rate, the radvaste concentration is decreased at least by a factor of 10 prior to discharge into the Bay.
The maximum concentration of Ag-110m in the effluent, prior to dis-charge into the Bay, and before the collection of the June oyster sample, was 2 x 100 pCi/ml which represents less than 0.1% of the limit specified in the' 10 CFR Part 20, Appendix B, Table II (3 x 10-5 pCi/ml) for unrestricted areas.
Oysters have a natural tendency to highly bioconcentrate environmental silver. As a result of this bicaccumulation, oyster meat shows radioactive silver as observed in the sample ~ collected during August 1984. These levels are reportable on the basis of the Calvert Cliffs ETS exceedance 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 Conoy in August.1984, 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 recommended in the Re6ulatory Guide 1.109. Revision 1, 1977)'is estimated at less than 2.9 x '0-2 mrem / year and less than h.1 x 10-5 mrem / year, respectively.
The observed level of Ag-110m in the oyster sample collected from the oyster bars, at Camp Conoy was (77 1 5) pCi/Kg (wet) for March 1984, and (8515) pCi/Kg (wet) for June 1984. For the first three quarters of 1984, a mean value of (981 4) pCi/Kg (wet) can be considered in dose computation.
Based on this mean value, the potential dose commitment to the GI-tract and to the whole body of a maximum exposed individual (with a consumption rate of 5 Kg/ year and the dose conversion factors as recommended in the Regulatory Guide-1.109, Revision 1 1977) is estimated at less than 2 9 x 10-2 mrem / year, andlessthan4.3x10-$ mrem /yearrespectively, i
y v.
- ~
' - 3.-
r Thesedoserates-aresmall-frac'tions-(0.1%and1.7:x10-hkrespec-
~
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 insignifi-.
cant consequence to the health and safety of the public.
Very truly yours, h
Gary R. Fuhrman, Director Environmental' Programs MG/fev -
cc: Document Control Desk Dr. Randy A. Roig Mr. T. Foley s
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