Re: Permanent Shielding

[DOUG TURNER <turners@earthlink.net>]

Paul,

While I was the RPM at Oyster Creek we had Enineering per-approve shielding
on pipes .  Some of the variables were the diameter and thickness of the
pipe, the space between hangers, and of course the weight.  HP engineering
logged and tracked the installation and verified the sheelding hadn't moved
with a tape that was secured between the pipe and the lead.  The log was
transmitted to corporate engineering for information periodically (quarterly?). 

When I started with SCE in 1989 they had a similar problem, and modified
Oyster Creeks procedure.  I would expect both facilities to share their
procedures with you upon request. This was a BIG money saver in engineering
time, reviewer's time, project complexity, etc.  

Those applications outside the canned parameters still need individual
analysis for stress loading but they are few and far between.

Good Luck, Doug Turner Email turners@ earthlink.net

 At 02:56 PM 5/9/96 -0500, you wrote:
>  This is an inquiry to nuclear power generating stations.
>  
>  I would like to establish a process by which permanent shielding could be 
>  installed without going through the entire modification process.  Our mod 
>  process is burdened with a Technical Review Committee and a Business 
>  Review Committee meeting, endless cost justifications, extremely long 
>  implementation times from proposal to installation.  Our aim is to 
>  streamline this process such that RP would install shielding which would 
>  satisfy deadweight, thermal, seismic stresses, 2 over 1 concerns and a 
>  majority of safety related concerns that might apply.  RP would provide 
>  the money for purchasing the materials, the design the pipe stress 
>  analysis and installation of the shielding under the temporary shielding 
>  procedure.  We would then turn the installation over to Engineering for 
>  final approval, drawing changes 10 CFR 50.59 reviews, etc..  They would 
>  have 12 months to approve the installation or provide an extension.
>  
>  I have not proposed this to Engineering yet.  I don't expect a favorable 
>  response unless other stations have some streamlined process in place 
>  already. 
>  
>  If your station has any method for installing permanent shielding, I would 
>  like to discuss it with you.  Please send me a message including your 
>  phone number and/or e-mail address so I can contact you on the topic.
>  
>  Paul Vitalis
>  Principal Health Physicist
>  Byron Nuclear Power Station
>  byrpv@ccmail.ceco.com
>
>
>