Andy,
Diablo Canyon responses to your questions are provided below in red.
Ken Kargol Reactor Engineering 805 545 4075
From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Kelliher, Andrew P Sent: Monday, January 23, 2012 10:03 AM To: 'pwrrm@retaqs.com' Cc: Knowles, Justin W; Brown, Kenneth; Hellems, Ryan T Subject: [Pwrrm] Spent Fuel Pool (SFP) Clarity
R.E. Ginna is working to improve our SFP clarity. Currently, we have a large amount of "dirt" in our pool which causes the pool to cloud after 6-10 pool to pool fuel moves. We have developed the following questions:
Do you have clarity issues with your SFP; what is the perceived cause? Not in general. Main SFP visibility issue is after offload due to thermal affects (heat coming off the fuel) and soluble crud in the water (from all the fuel moves).
Do you use supplemental filtration (such as Tri-Nuc filters) to maintain clarity? No
What permanently installed equipment do you use to maintain clarity? Normal spent fuel pool cooling system consists of 1 (of 2) pump running, one heat exchanger, and part of the flow is diverted through a purification loop (resin bed and filter).
Your response to any of the questions above will be much appreciated. Also, if you have a good procedure or have performed a modification to control or improve SFP clarity please include details to help us in our efforts.
Thanks, Andy
Andrew Kelliher Reactor Engineer R.E. Ginna Nuclear Power Plant Phone: (585) 771-3457
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