Ideas on Eliminating Np as a Contaminant of Concern

["Anagnostopoulos, Harry W." <HAROLD.W.ANAGNOSTOPOULOS@saic.com>]

RADSAFERS;



I'm currently involved in an investigation at a site that used to process

enriched Uranium. The U came through the gaseous diffusion process. Some

recycled fuel may have been run through the enrichment cascade at the

gaseous diffusion plant, so there is some small potential that the site

contaminants may include Am-241, Pu-239, and Np-237.



We have calculated soils DCGLs and the Np-237 value is quite low. So low as

to be VERY difficult to detect via conventional methods.



We are familiar with NUREG-1757, Vol. 2 3-4 (Consolidated NMSS

Decommissioning Guidance) which suggests that some radionuclides may be

removed from final status survey if the value contributes less than 10% of

the site dose.



Has anyone had experience (successful or otherwise) in using this provision

to eliminate transuranics from consideration at enriched fuel sites?



We are interested in information or experience in sampling approaches and

analysis techniques. We have some ideas, but with RADSAFE, there is always

someone out there that did it before, and may have done it better.



Please reply to my private e-mail unless you feel that the response is

valuable to the whole readership (this threshold seems to be very low

now-adays)...



Regards,



Harry Anagnostopoulos, CHP



Harold.W.Anagnostopoulos@saic.com



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