See Comanche Peak answers below in red text.
Matthew R. Weeks Luminant Matthew.Weeks@luminant.commailto:Matthew.Weeks@luminant.com office 254-897-5183, fax 254-897-6780 cell 817-975-2051, home 817-249-4559 From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Kelliher, Andrew P Sent: Monday, January 23, 2012 12:03 PM 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? CPNPP does not have a chronic problem with water clarity
Do you use supplemental filtration (such as Tri-Nuc filters) to maintain clarity? No, our permanently installed equipment is sufficient.
What permanently installed equipment do you use to maintain clarity? During the normal cooling operation, a portion of the spent fuel pool water may be diverted through the purification loop which consists of a filter, demineralizer and resin trap. The design flowrate through the purification loop is a maximum of 250 gpm. The minimum flowrate is governed by the pressure drops in the associated filters, demineralizers and resin traps. A low flow condition may impact the performance of the purification loop and, depending upon a number of other conditions and variables, the ability to maintain the required water quality in the Spent Fuel Pools. However there is no explicit low flow design criteria for these loops.
A high differential pressure indication across the spent fuel pool demineralizers during normal purification operations identifies that it is time to replace the resins. The demineralizers are isolated and the resin is transferred to the liquid waste processing system by the spent resin sluice pump.
There is a skimmer loop which consists of skimmers, a strainer, a skimmer pump, and a filter. This loop normally operates to maintain surface water clarity in the pools. The design flow rate through the skimmer loop is 10 gpm.
Normally, Train A cooling and purification loops are used to service No. 1 spent fuel pool while Train B is used to service No. 2 spent fuel pool. The system is cross‑connected so Train A or B have the capability of cooling and/or purifying either spent fuel pool.
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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