ML20042B981
| ML20042B981 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 02/25/1982 |
| From: | Rich Smith NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Mcgoey R GENERAL PUBLIC UTILITIES CORP. |
| References | |
| REF-WM-3 NUDOCS 8203290087 | |
| Download: ML20042B981 (2) | |
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GWRoles PHLohaus RDSmith Mr. P,1ch McGoey GPU Huclear Corporation REBrowning JBMartin 100 Interpace Parkway Parsippany HJ 07954 P D A.
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Dear Mr. McGocy:
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This correspondence is in regards to your January 22, 1982 conversation with T. Johnson of my staff concerning'the acceptabi itf of disposing of wastes containing short-lived Curium 242 in near-sur ace disposal facilities. This discussion involved a question regardi r$hemrc.7 ref,'A,919 g3 application of the 10 nC1/g transuranic limit to certain Oyster Cr L4; t e-y
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evaporator bottom wastes. Specifically, you stated that analysis o these wastes indicates the cumulative 10 nC1/g limit for long-lived 9 7 d
transuranic nuclides would be exceeded if Cm-242 wa, included in the ca total transuranic concentration.
The discussion concerning short-lived transuranics in Chapter 7 of the Draft Environmental Impact Statement to 10CFR61 (NUREG-0782, Volume 2) provides a rationale for addressing Cm-242.
In this discussion a separate waste classification limit is derived for Pu-241, a short-lived transuranic which has a long-lived alpha-emitting daughter. Because Cm-242 has a 163 day half-life, it is not in itself of significant concern from a disposal perspective. However, Cm-242 decays to Pu-238, a long-lived transuranic alpha-emitter with an 86 year half-life.
If the same approach used to derive a waste classification limit for Pu-241 in Table 1 of the proposed Low-Level Waste Regulation 10CFR61 is also considered for Cm-242, the upper concentration limit for Cm-242 would be 2 uC1/g. That is, waste having initial Cm-242 concentrations less than 2 uCi/g would generate Pu-238 daughter products less than 10 nCi/g. The Cm-242 limit is derived by multiplying the ratio of the Pu-238 half-life to the Cm-242 half-life times 10 nCi/.. the overall alpha-emitting transuranic limit. The partial sums of other nuclides listed in Table 1 would, of course, also need to be considered for the Oyster Creek wastes.
It is our position that Cm-242 should be considered to meet the 10 nC1/g limit only if the sum of the concentrations of its long-lived daughter, Pu-238, in combination with the other long-lived transuranics remains l
l less than 10 nC1/g.
Irrespective of this position, the individual states, l
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which regulate the comercial disposal sites, would still need to be consulted regarding the acceptability of the Oyster Creek wastes.
If you have any additional questions regarding the proposed waste classifi-cation system, please contact me at 301-427-4433 or Tim Johnson at 301-427-4160.
Sincerely.
Original Signed by R. DALE SMITH R. Dale Smith, Chief Low-Level Waste Licensing Branch Division of Waste Management l
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20%1.1/TCJ/82/02/09/0 It is our osition that Cm-242 should only be considered in the 10 nCi/g limit to th extent that the concentration of its long-lived daughter, pu-238, and o er long-lived transuranics remains less than 10 nCi/g.
Irrespective of his position, the individual states, which regulate the commercial dispos sites,'would still need to be consulted regarding the acceptability of th Oyster Creek wastes.
If you have any additio 1 questions regarding the proposed waste classification system, pl se contact myself at 301-427-4433 or Tim Johnson at 301-427-4160.
Sincerely, R.
le Smith, Chief low-L el Waste Licensing Branch Divisio of Waste Management
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- See previous Official Reco d Copy for concurrences.
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DATE :82/02/09
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2-It is our gition that Cm-242 should only be consider-in the 10 nc/gm limit to the e ent that the concentration of its lo -lived daughter, Pu-238, and othe ong-lived transuranics remains ss than 10 nc/gm.
Irrespective of thi osit. ion, the individual st es, which regulate the commercial disposal si e, would still need to e consulted regarding the acceptability of the Oyst Creek wastes.
If you have any additional ques ons re ding the proposed waste classification system, please cont t yself at 301-427-4433 or Tim Johnson at 301-427 4160.
Sin
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R. Dale Smith, Chie Low-level Waste Licens a Branch Division of Waste Managem t I
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DATE :82/02 82/02/oi 82/02/10 : 82/02/
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