RE: Prophylactic decon

[glen.vickers@EXELONCORP.COM]

As Bill says, pre-rinsing a cask before insertion into a contaminated medium

is a standard practice.  For more details, call your local BWR because they

perform activated metals shipments where the cask must be lowered into the

fuel pool.  



Also try giving Ken forrester from Nukem a call.  They do a lot of work in

this area.  The last number I had for him was 803-731-1588.  Ken has done

this many times and will have great information as well.



You might also call some of the older power plants, because a few are

removing fuel from the pool and putting it into dry storage.  



Be sure to ask whether the outer metal surface is finished the same as the

cask you're interested in.  Of course, once you collect some data, you might

not find much of a difference.  



I don't have any direct experience myself, but these are a couple places

where you should be able to get data from.  After benchmarking a few places,

you should have enough data to create some procedural action levels of your

own.



Glen Vickers



> -----Original Message-----

> From:	William V Lipton [SMTP:liptonw@DTEENERGY.COM]

> Sent:	Friday, January 18, 2002 6:16 AM

> To:	Jack_Earley@RL.GOV

> Cc:	radsafe@list.vanderbilt.edu

> Subject:	Re: Prophylactic decon

> 

> Prerinsing a fuel pool cask with clean water is standard practice, not so

> much for airborne as for contamination control.  The clean water fills the

> pores and will prevent hard to remove contamination if the cask is not in

> the pool for an extended time.  For airborne control, the cask should be

> rinsed as it is removed from the pool and promptly deconned.  The airborne

> problem will occur as the cask dries out.  Also, don't forget to decon any

> rigging equipment that goes in the pool.  You may also need hot particle

> controls.  (See the recently issued NRC Information Notice 2002-03 "Highly

> radioactive particle control problems during spent fuel pool cleanout.")

> 

> The time the cask spends in the pool should be minimized.  If it is left

> in the pool for more than one shift, the contamination will get into the

> pores and will be difficult to remove.

> 

> If the cask has been left in the pool for more than one shift, you should

> plan on several days for decontamination.  You have to decon, wait a day

> for

> contamination in the pores to weep out, survey and then decon again, if

> necessary.  Otherwise, the cask could arrive with contamination above the

> limits.

> 

> The opinions expressed are strictly mine.

> It's not about dose, it's about trust.

> Let's look at the real problems, for a change.

> 

> Bill Lipton

> liptonw@dteenergy.con

> 

> Jack_Earley@RL.GOV wrote:

> 

> > Does anybody have any data on the effectiveness of a demin water rinse

> > before submerging a SS (125 RMS) cask into a contaminated pool?

> Anecdotal

> > evidence indicates pre-rinsing results in lower airborne contamination

> when

> > the cask is removed from the pool, if the cask is submerged for one

> shift (8

> > hours) or less.

> >

> > Jack Earley

> > Radiological Engineer

> >

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