RE: Powernet: Depleted Zinc - Increased Dose Rate?

Thu, 09 Feb 2012 16:04:56 -0800

SONGS did not see any significant dose increase.



From:        "Burtoff, Charles" <[email protected]>
To:        "'[email protected]'" <[email protected]>
Date:        02/08/2012 07:09 AM
Subject:        RE: Powernet: Depleted Zinc - Increased Dose Rate?
Sent by:        [email protected]



At Crystal River 3 we did not see a significant increase in Auxiliary Building dose rates at the beginning of the process. We started depleted zinc acetate addition about nine months before our last outage, slowing bringing the RCS Zn concentration up to around 5 ppb. We only added a total of 25 ppb-months. We saw a slight gradual increase in Co-58 and Cr-51 activity in the RC coolant and a smaller increase for Co-60. This did not translate into any significant increases in local area dose rates.
 
 
Chuck Burtoff
Radiation Protection
Crystal River 3 Power Plant
15760 W. Powerline St.
Crystal River, FL 34428
352-795-6486 x3012
 
 
 
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Tuesday, February 07, 2012 11:56 AM
To: [email protected]
Subject: Powernet: Depleted Zinc - Increased Dose Rate?
 
At Davis-Besse,  we are preparing to inject depleted zinc.  A question has come up regarding the potential for increased dose rates as we start this process.  Did any of you who are or have injected your RCS with depleted zinc experience higher dose rates in the Auxiliary Building at the beginning of the process? If so,  what system and what was the magnitude of increase?   Thanks. ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
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