NUREG/CR-0628, Submits Effect of NUREG/CR-0627 & NUREG/CR-0628 on Radon Emission Values in Facility Record.Said Repts,Issued by Battelle Pacific Northwest Lab,Indicate That Facility Radon Releases Were Conservatively High
| ML19254D110 | |
| Person / Time | |
|---|---|
| Site: | Perkins, Skagit  |
| Issue date: | 09/11/1979 |
| From: | Wilde R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Lowenberg H NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML19254D091 | List:
|
| References | |
| NUDOCS 7910220386 | |
| Download: ML19254D110 (1) | |
Text
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UNITED STATES l'^
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September 11, 1979
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MEMORANDUM FOR:
Homer Lowenberg, Assistant Director for Operations and Technology FR0?i:
Ralph M. Wilde, Program Assistant Division of Fuel Cycle and Material Safety
SUBJECT:
EFFECT OF INTERIM REPORTS NUREG/CR-0627 AND NUREG/CR-0628 ON THE RADON EMISSION VALUES IN THE PERKINS RECORD In the Perkins proceeding, the staff estimated the radon emissions from uranium mining and milling based on data available at that time and noted that the staff had various efforts under way to upgrade that data base.
Two interim reports that will provide updated information now available from ongoing research projects on the subjact of radon releases from uranium mines NUREG/CR-0627, " Radon Emissions in Ventilation Air Exhausted from Under-are:
ground Uranium Mines," and NUREG/CR-0628, " Prediction of the Net Radon Emission from a Model Open Pit Mine." Both of these documents are currently being prepared for publication by Battelle Pacific Northwest Laboratory.
In these reports, consideration is being given to upgraded data on radon exhalation rates and to analyses of current and projected mining methods and practices in order to refine mine models for both the period of active mining and after the mine is shut down.
The values given in the Perkins record (affidavit and oral testimony of Ralph M.
Wilde) for radon releases from uranium mining were 4060 Curies / Reference Reactor Year (RRY) for active mining and 100 Curies / Year per RRY for inactive or abandoned mines.
On the basis of the preliminary infomation available from x
the interim reports, the current estimate of radon release during active mining would be approximately 80 to 85% of that in the Perkins record. Similarly, the current estimate of radon release from inactive or abandoned mines would be approximately 25 to 30% of that in the Perkins record.
Therefore, the trend of the preliminary information avaliable from the Battelle reports indicates that the estimates of radon releases in the Perkins record were conservatively high.
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Ralph M. Wilde, Program Assistant Division of Fuel Cycle and Material Safety 791$220
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