FW: Message requesting help on temporary shielding

[Jerald_L_Eby@RL.GOV]

Late morning to All,

I have a facility here at the Hanford Reservation that is work through a

shielding issue.  Below is a brief description of their needs.  When

responding, please send to either of the cc-mail addresses listed below.

Thanks



Jerry Eby

ALARA Center of Technology

Fluor Hanford

(509)372-8961 Fax (509)3767717



> Subject:	Message requesting help on temporary shielding

> 

> Folks, the following message requests help in solving a temporary

> shielding problem at our Pu facility.  If there is someone at your Site

> that could offer some suggestions we would really appreciate a response.

> We will be glad to share the responses and  the actions we take to solve

> this problem.  

> 

> 

> "At Hanford, we are experiencing elevated neutron and gamma radiation

> levels in a room used to store Special Nuclear Material (SNM).  Source of

> the radiation is from containers of SNM stored inside a cage.  We would

> like to eliminate the gamma radiation and reduce the neutron radiation.

> Our plan is to install temporary shielding on, or adjacent to, the sides

> of the cage to a height of about 6' for a total distance of about 26'.

> This section of the cage also includes an entrance gate.  We are

> tentatively planning on having someone fabricate a stainless steel

> "sandwich" with borated polyethylene inside.  The borated poly will be 1"

> thick and the stainless steel will be 1/4" thick.  We are concerned that

> the 1" thickness of borated poly may not be enough to effectively

> attenuate the neutrons.  Concerns from the plant include seismic, floor

> loading, and the need to be non-combustible.  The final product can not

> ignite, burn, support combustion, or release flammable vapors, when

> subjected to fire or heat.  

> 

> We suspect that someone else has already encountered this same problem and

> has taken action to solve it.  If anyone knows of better materials or

> methods of providing temporary shielding that will attenuate the neutron

> and gamma radiation, please get in contact with the Hanford ALARA Center

> or Greg Hauger at the address/phone shown below.  We are also interested

> in finding a vendor that has the resources to fabricate this type of

> shielding.  Our plan is to install additional sections of the shielding in

> several other areas if it proves to be effective."  

> 

> Thanks in advance,

> 

> Larry O. Waggoner		Greg Hauger

> ALARA Center of Technology		PFP ALARA Coordinator

> (509)376-0818				(509) 376-3125

> larry_o_waggoner@rl.gov		greg_s_hauger@rl.gov

> 

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