ML19317H461
| ML19317H461 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/20/1980 |
| From: | Snyder B Office of Nuclear Reactor Regulation |
| To: | Jay Collins Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8006090033 | |
| Download: ML19317H461 (3) | |
Text
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Muy 20, 1980 MEMORANDUM FOR: John T. Collins, Deputy Program Director TMI Program Office, NRR FROM:
Bernard J. Snyder, Program Director TMI Program Office, NRR
SUBJECT:
IMPLEMENTATION OF INTERIM CRITERIA FOR RADIOLOGICAL EFFLUENTS FROM TMI-2 DATA GATHERING AND MAINTENANCE OPERATIONS Attached is the guidance you should follow in implementing the interim criteria which were approved by the Comission on April 7,1980. This guidance was prepared at my request by the Radiological Assessment Branch and covers gaseous effluents. Similar guidance will be provided separately on particulate effluents.
l Bernard J. Snyder, Program Director TMI Program Office Office of Nuclear Reactor Regulation
Enclosure:
Implementation of Interim Criteria cc: M. R. Denton T. Murphy F. Congel Distribution:
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IMPLEMENATION OF INTERIM CRITERIA PREPARED BY F. CONGEL RADIOLOGICAL ASSESSMENT BRANCH I
On April 4,1980, the Comission approved the interim criteria outlined in SECY-80-175 that is to be used by the staff when deciding whether radioactive releases resulting from t3 TMI-2 cleanup operation are acceptable. The following discussion describes the technical approach that will be followed in implementing these interim criteria.
The only noble gas of significance remaining within the TMI-2 facility is Kr-85.
Appendix I to 10 CFR Part 50 states annual design design objectives for noble gases as follows:
10 mrad air dose from the gamma radiation component and 20 mrad air dose from the beta radiation component, provided that no member of the general public receives 5 mrem total body dose or 15 mrem skin dose For Kr-85, the 20 mrad beta air dose and the 15 mrem skin dose are about equally limiting.
Based on the annual average meteorological dispersion factor
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6.7 x 10 sec/m and a shielding factor of 0.7, a constant Kr-85 release rate of 1440 Ci/ week will yield a 15 mrem annual skin dose at the most limiting site boundary location.
Using the approved interim criteria, noble gas releases up to 5% of the above (Appendix I) weekly rate can be approved by the on-site deputy director (i.e.,
72 C1/ week).
Noble gas releases above 72 Ci/ week but less than 50% of the Appendix I weekly rate (i.e., 720 C1/ week) can be approved by the Director, Office of Nuclear Reactor Regulation.
Release rates above 720 Ci/ week require Commission approval.
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Appendix I to 10 CFR 50 expresses the dose design objectives in terms of limiting the release of radioactive materials to the environment. Therefore, it is necessary to calculate the allowable geleases in curies on a priori basis. This procedure is consistent with the most recent generic tenchical specifications which limit the release of radioactive materials based on historical meteorological data and land use. Of course, periodic updating is required.
In addition, the weekly curie releases can be distributed freely during the week.
For example, the entire limit can be reached in less than one day provided that no releases occur during the remaining part of the week.
Guidance regarding particulate radionuclides will follow.
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