ML19225C052
| ML19225C052 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/23/1979 |
| From: | Stout J BALTIMORE GAS & ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7907260424 | |
| Download: ML19225C052 (2) | |
Text
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g B A LTIM ORE Il GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING oEpaaruEsr July 23,1979 Mr. Boyce H. Grier, Director Office of Inspection and Enforcetent Region 1, USURC 631 Park Avenue King of Prussia, PA.
19h06
Dear Mr. Grier:
Subject:
Calvert Cliffs Nuclear Pcwer Plant Units No. 1 and 2.
License Nos. EPR-53 and 69 Nonroutise Radiological Environtental Operating Report.
Thic report is submitted, in duplicate, to comply with the require-ments of Appendix 3 Envirottental Technical Specifications Section 5.6.2.b.
The Oyster sarples were collected on June 13, 1979 from the Carp Conoy sampling location and analysed for garra-emitting radionuclides as required by Secticn 3.2 Appendix E Environtental Technical Specifications.
The results of the analyses showed the presence of Ag-llCn at 172 55 pCi/Kg(vet).
The oyster carples collected on the cane date from the Kenwood Eeach sarpling location (the background locaticn) chewed Ac-110c at 55 pCi/Kg(wet).
The teasurable level of Ag-llCn in oysters was first detected in samples collected fron the Carp Ccnoy sarpling location in June 1977 Sub-sequently, carples collected in 1977 from the same location also shoved report-able levels of Ac-llc as did the carples collected in January, February, Decetber 1978 and March 1979 These findings vere reported to the URC as required.
The oyster sarples collected fron the Carp Coney location from !&rch 1978 thru March 1979 showed an apparent decrease in Ag-110 concentrations.
These concentrations ranged frcn 310 i 10% to 61 1 15 pCi/Kg(vet),cccpared to the average background value of about sh0 pCi/Kg(vet).
The observed de-crease may in large part be due to depuration even though the effluent releases from the plant during the pt:riod of interest contained small quantities of Ag-llos.
'J d" )
79072605",q f
4 N5
n Mr. Boyce H. Grier 7/23/79 Beginning with the fourth quarter of 1978 oyster sarples are analyzed by the Chemical Engineering and Test Section of our Electric Test Department.
The sample size and the count tire are selected to meet the required de+ection capabilities for a number of radionuclides including Zr-Ub-95 As a result of this exercise, the MPL value for Ag-110m is calcu-lated at <5 pCi/Kg(vet), which is substantially lover than the previous average MDL value of about SLO pCi/Kg(vet).
On the assurpticn that this new FTL value of 5 constitutes the background value, the level of Ag-110= observed in Jur.e 1979 Camp Conor sa:ples exceeded the background value by over a facter of 10.
Based on the observed levels of Ag-11Cm dr. ring June 1979, for an average adult consuring 50 grams of oysters per day the doses Eo the GI Tract and Whcle Body are esticated at <2 x 10-' tren/ year and <3 x lo-? trec/ year, respectively.
These are very stall fractions cf the allovable 25 tren/ year (GI Tract) and 25 tren/ year (Whole Ecdy) doses to rembers -
the general public, (ho rFR Part 190 Environtental Eadiation Protection Standes.ds for Nuclear Power Operaticns) and are considered to be of no consequence to the health and safety of the public.
Very truly yours,
r j -
J. W. Stout, Jr.
Chief Environnental Engineer cc: Director, Office of Nuclear
.ctor Eegulation r
Washington, DC 20555 (17 copies) 24h
.