ML19256D724
| ML19256D724 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/16/1976 |
| From: | Grimes B Office of Nuclear Reactor Regulation |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910220645 | |
| Download: ML19256D724 (3) | |
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Rchert Reid, Chief, Cperating Reactors Branch, #, DOR T.C'.EE IIILE ISLA:iD TECC;ICAL SPECIFICA'ICII CIA.!GE iC. 26 Per cc:riersation vi till Ross of your staff, caclosed is an evaluation of the _nree Mile Island proposed chan~,c to technical srceification limits for dissolved radioactive noble gases in liquid effluents.
Tnis evaluation is based c.n cn October 5,1972 meno from A. Giambusso, Deputy Director for Reactor Projects, Directorate of Licensing to Fcactor Projects Persouncl.
Brian K. Grires, Chief, Environmental Evaluation Branch Division of Operating Reactors Encias:ure: As stated cc:
D. Eisanhut K. Goller J. Collins R. Vollmcr W. Kreger W. Rosa L. Barrett 1453 152 E. Adensam J.S. Bland L. Higginbotham Distribution: /CentralFile 7RR-Rd g.
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TEC:1,*IC11 SPECIFICATICN CILCG2 30. 26 THREE MILE ISLA'!D NUCLEAR STATION UNIT 1 DOCITT NO. 50 - 289 OPERATING LICENSZ NO. DPR - 50 Evaluation Current technical specifications do not contain a limit for dissolved noble gases nor does 10 CFR Part 20 specifically have such limits for noble gases in water in its appendices.
The general guidance provided in Appendix B, Table II, Column 2 of 10 CFR Part 20 for any single radionuclide not listed in the tables with a decay mode other than alpha emission or spontaneous fission and with radioactive half-life greater than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for the maximum
~0 permissible concentration in water (MPC ) is 3 x 10 C1/ml.
The staff has converted the maximum permissible concentration in air (MPC,)
to an equivalent concentration in water for noble gases (Xe-133 and Xe-135) as reported in 10 CFR Part 20 for submersion doses by the equation used to' determine these limits as given in " Report of ICRP Committee II on Permissible Dose for Internal Radiation (1959)", Health Physics, Volume 3, June 1960.
The MFC, was determined on the bases of a semi-infinite media for the air sub-3 mersion dose and the density of air (0.0012 g/cm ).
To determine an equi-valent concentration limit in water, the MPC is divided by a factor of 2 for the infinite media of water to the semi-infinite media of air and multiplied by the ratio of the density of water (1 g/cm ) to the density of air (0.0012 g/c:.. )
- which provides an everall multiplier ef approximately 400.
The resulting technical specification limits by the-ICRP method (which includes beta contr bution) is 1. 25 x 10" uCi/ml for Xe-133 and 4.2 x 10~ uCi/ml for Xe-135.
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2-Based upon the above analysis of appl'icable technical specification
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limits for dissolved noble gases in liquid ef fluents, Technical Speci-fications for Three Mile Island Nuclear Station Unit 1 shall contain a gross radioactivity concentration limit for dissolved noble gases in
-5 liquid effluents of 4 x 10 pCi/ml (Xe-135 controlling radioisotope).
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