Reference, Questions and Help > Lessons Learned
how hot is clean?
Llama:
NUREGs have sugested a more realistic approach to the resident farmer. You can model it more realistically (i.e. if there are deed restrictions on the LTP). Therefore the modeling can reflect a truer future use of the land. The problem is to get a buy-in of all parties involved.
btw: MARSSIM I still have that cold brew awaiting you when you stop by
RAD-GHOST:
AA,
You may be on to something with the Release Criteria based on Occupations! I don't believe you could ever include lawyers in the D&D equation. If you interjected lawyers into the calculation, " Worth vs Risk ", you would be Free Releasing the Commercial Plants at 100% Power!
Sorry, but I couldn't resist, RG!
atomicarcheologist:
--- Quote from: RAD-GHOST on May 13, 2005, 04:26 ---AA,
You may be on to something with the Release Criteria based on Occupations! I don't believe you could ever include lawyers in the D&D equation. If you interjected lawyers into the calculation, " Worth vs Risk ", you would be Free Releasing the Commercial Plants at 100% Power!
Sorry, but I couldn't resist, RG!
--- End quote ---
OK, thanks. But to get back onto the topic, how much can one leave behind as clean with a delicense operation? Could we assume that 100K/100 cm2 of Co60 would be OK? Could we go to 150K if it was only U238? What would the transuranics work out to?
RDTroja:
--- Quote from: Atomic Archeologist on May 17, 2005, 06:08 ---OK, thanks. But to get back onto the topic, how much can one leave behind as clean with a delicense operation? Could we assume that 100K/100 cm2 of Co60 would be OK? Could we go to 150K if it was only U238? What would the transuranics work out to?
--- End quote ---
I have to admit total ignorance when it comes to D&D work, but if 100K/100cm2 of Co60 is releasable anywhere, then what the hell are we worried about releasing items and areas that are over 1Kdpm/100cm2 in the commercial end of the world? Or for that matter having release limits of 'No detectible activity' even considered if we are just going to release it all later at 100K?
That does not compute...
raymcginnis:
At our site, the related questions that keep coming up are what is MDA and what is background. We are politically driven on these two questions by protestors and community groups. We have this big push from them to go to 10-6 levels, similar to chemical sites. The problem is the natural radioactivity that has been here since the earth was created. To get to 10-6 risk for uranium in soil, the labs would have to analyze the samples for 10 weeks to meet the MDA.
If you have no community groups, then the answers given previously are correct. For buildings, Mike was right. Those are the most common limits. For soil, you have to consider all the possibilities of land use and pick either the most likely, or if your politics drive it, the most conservative.
When we use RESRAD for soil, we always go for "Family Farm" (most conservative) because of our politics.
We also use NDA for facilities and equipment when possible, but we have to state on our surveys what NDA is. In general, we use ALARA as our goal. For soil we use 15 mRem/yr as our limits in RESRAD, but we always try to get way below that. MARSSIM explains all of these principals very well. That is the path we are all on now, unless you are somehow grandfather claused out of MARSSIM. Some NRC places may still be able to use 100 mRem/yr. There is no standard for what is hot now. It is all under debate. There are NRC, DOE and DOD standards, but they all still disagree on this. It is what you can negotiate with your regulator that sets your true limits. That is determined by your local politics. That is what I have found. If you travel from place to place, your limits may change from place to place, depending on politics.
Nuff said.
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