To all- One of our colleagues in chemistry attended a conference and
brought back the following OPEX. We were asked to poll the industry .
" Co-60 concentrations at FitzPatrick took a step change
decrease following the fall 2008 refueling outage. The station did
replace eight OEM CRBs in the fall 2008 refueling outage, but station
experience shows that a step
change decrease in Co-60 concentrations did not occur with a
similar number of OEM CRBs replaced in past outages.
* According to the station, in the fall 2008 refueling a
significant effort was implemented to vacuum out portions of the RPV.
The annulus was vacuumed as well as guide tubes (for removed CRDs)
during CRD exchange. "
1. Has your site or are you aware of any other sites that have
experienced this phenomena? ______ Yes _____ No
2. Contact e-mail/phone: ____________________________________
3. Any other details would be appreciated
Thanks for your time!
Sincerely,
Ed Wolfe
Exelon Nuclear
LaSalle Station
Senior ALARA Analyst
( Telephone: 815.415.2521
. Email: [email protected]
: Fax: 815.415.4018
On-site pager: 815.415.2521
Off-site pager: 815.983.0811
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