ML073310575

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Email from M Chawla to Dale Vincent LAR to Revise Containment Sump Resolution
ML073310575
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 10/23/2007
From: Mahesh Chawla
NRC/NRR/ADRO/DORL/LPLIII-1
To: Vincent D
Nuclear Management Co
Chawla, ML, NRR/DLPM/LPD III-2, 415-8371
References
TAC MD3811, TAC MD3812
Download: ML073310575 (2)


Text

Dale, In reference to the above LAR, please arrange a teleconference to discuss the following information:

BACKGROUND By letter dated December 14, 2006 (ML063480462), Nuclear Management Company, LLC (NMC), proposed a change to the Prairie Island Nuclear Generating Plant Units 1 and 2 Technical Specifications (TS). The amendment request is to revise the nomenclature in TS Surveillance Requirement (SR) 3.5.2.8 of the Emergency Core Cooling System (ECCS) sump debris interceptors from trash racks and screens to strainers and to increase the Refueling Water Storage Tank (RWST) minimum water volume specified in SR 3.5.4.1 from 200,000 gallons to 265,000 gallons.

In order for NRC to evaluate the proposed changes, the staff requests the following information:

1. A definition of the current licensing basis (e. g., required NPSH satisfied with 50 percent of strainer area obstructed) and confirmation that the current sump configuration, with newly installed strainers conforms to the current licensing basis.
2. Address if any pipe reroutes, and pipe support changes or any other modifications are required to accommodate the new strainer assemblies. Provide a summary of these modifications if any and the associated evaluations to establish the structural integrity of the strainer assemblies.
3. Briefly describe the load combinations that are used in the structural design of the modified sump strainer components and the floor mounted bolted connections.

Mail Envelope Properties (471E5558.F96 : 2 : 35476)

Subject:

LAR to revise Containment Sump Resolution - MD3811/12 Creation Date 10/23/2007 4:11:04 PM From: Mahesh Chawla Created By: MLC@nrc.gov Recipients Action Date & Time nmcco.com Transferred 10/23/2007 4:11:20 PM Dale.Vincent (Dale.Vincent@nmcco.com) nrc.gov OWGWPO01.HQGWDO01 Delivered 10/23/2007 4:11:20 PM cxb10 CC (Chakrapani Basavaraju) Opened 10/23/2007 6:04:51 PM

nrc.gov OWGWPO02.HQGWDO01 Delivered 10/23/2007 4:11:11 PM EXG CC (Ervin Geiger) Opened 10/24/2007 7:19:03 AM nrc.gov TWGWPO01.HQGWDO01 Delivered 10/23/2007 4:11:11 PM KAM CC (Kamal Manoly) nrc.gov TWGWPO02.HQGWDO01 Delivered 10/23/2007 4:11:11 PM MLS3 CC (Michael Scott)

Post Office Delivered Route nmcco.com OWGWPO01.HQGWDO01 10/23/2007 4:11:20 PM nrc.gov OWGWPO02.HQGWDO01 10/23/2007 4:11:11 PM nrc.gov TWGWPO01.HQGWDO01 10/23/2007 4:11:11 PM nrc.gov TWGWPO02.HQGWDO01 10/23/2007 4:11:11 PM nrc.gov Files Size Date & Time MESSAGE 2380 10/23/2007 4:11:04 PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened