ML19317F180
| ML19317F180 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/07/1972 |
| From: | Muller D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Knohl H AFFILIATION NOT ASSIGNED |
| Shared Package | |
| ML19317F181 | List: |
| References | |
| NUDOCS 8001080896 | |
| Download: ML19317F180 (3) | |
Text
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Mr. Herbert Knohl Route 1, Box 282
.b Seneca, South Carolina 29678 Dear Mr. Knohl Thank you for your letter of September 26, 1972 to the Atomic Energy Coosnission requesting information on the difference in man-rem doses given in the draft and final Environmental Statements for the Oconee Nuclear Station.
t With respect to the estimated population dose (50 mile radius of the Oconee plant) from the release of radioactive materials in liquid effluent, the draft and final statements show doses of 100 and 6 man-rem per year for the three units respectively. This difference is accounted for by the reduction of the amount of radioactivity in liquid effluant expected to be released. The draft statement, on page 53, shows an anticipatd annual release of 30 curies, excluding tritium, in the liquid afflusnt. The final statement, on page 80, reflects a release of only 3 curies, excluding tritium. The reason for the factor of ten reduction in the radioactivity released as shown in the final statement is because a more detailed engineering analysis of the radiological waste treatment system for the Oconee nuclear units was made. The draft statement radioactivity ralcases and isotope distribution were temporary and conservative (higher than was expected) numbers used until the detailed engineering evaluation could be made.
Accordingly, the calculation of population dose based on the detailed engineering evaluation reflects the reduction in these released isotopes and a change in their distribution.
As for radioactive material released in gaseous effluent, the estimated annual release is given as approximately 15,000 curies per year of noble gases in both the draft and final statements (pages 53 and 83 respectively). T5e only difference being that the isotopic mixture l
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. t DV 07 197 1 Mr. Herbert Knohl is slightly changed in the final statement due to the more detailed engineering analysis of the system mentioned above. The population dose of 14 man-rem per year in the draft statement comes about by adding the skin dose contribution (beta radiation) and the total body contribution (gaisne radiation). Since only the body dose is a significant contributor to the genetic impact, the skin dose was not Since the charts in the statements included in the final statement.
show approximately 90% of the total gaseous release due to Xe-133, and with the Xe-133 whole body dose factor for submersion in air lower by a factor of three than the skin dose factor from the same isotope, the resultant total body population dose experiences a significant reduction also.
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9.H In the final statement, the man-rem dose due to the transportation of H
radioactive materials in solid waste was inadvertently omitted from The doses calculated in the transportation the Benefit-Cost table.
section total to 4.4 man-resa which therefore should be added to the Benefit-Cost table.
None of the differences described, including the omission above would change the staff's environmental conclusions concerning licensing of the Oconee Nuclear Station. I trust that this brief explanation of the differences in the two statements is satisfactory.
Sincerely, Originar signed by Gordon K. Dicker
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Daniel R. Huller, Assistant Director j
for Environmental Projects Directorate of Licensing DISTRIBUTION:
Central Files EP-2 Reading RP Reading A. Giambusso, DDRP, L D. R. Muller, ADEP, L j
G. K. Dicker, EP-2, L
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