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MONTHYEARML20099K6861985-03-11011 March 1985 Forwards Proprietary Upper Plenum Injection LOCA Program Plan Using Secy 83-472 Methodology, Per NRC 850212 Request. Affidavit Requesting Plan Be Withheld (Ref 10CFR2.790) Will Be Provided in 3 Wks.Encl Withheld Project stage: Request ML20116C9071985-04-22022 April 1985 Forwards Safety Evaluation for Rod Cluster Control Guide Thimble Plug Removal. Completion of Review Prior to Aug 1985 Will Allow Time to Purchase New Thimble Plugs If Removal Unacceptable Project stage: Other ML20116C9261985-04-30030 April 1985 Safety Evaluation for Rod Cluster Control Guide Thimble Plug Removal Project stage: Other ML20237C7461985-06-12012 June 1985 Notification of 850628 Meeting W/Util & Westinghouse in Bethesda,Md to Discuss Status of Util Upper Plenum Injection Evaluation Model (EM) Development & to Determine Level of Acceptability of EM Development Plan Submitted on 850311 Project stage: Meeting ML20237B9631985-06-12012 June 1985 Notification of 850626 Meeting W/Util & Westinghouse in Bethesda,Md to Brief NRC on Upcoming Fuel Change from Exxon to Westinghouse,Commencing During 1986 Refueling Outage for Both Units.Agenda Encl Project stage: Meeting ML20134P1651985-08-30030 August 1985 Forwards Revised Pages to NSPNAD-8412, Safety Evaluation for RCC Guide Thimble Plug Removal. Removal of Thimble Plugs Will Drop Differential Pressure Across Core & Reduce Liftoff Forces Acting on Fuel Project stage: Other ML20138H1951985-10-18018 October 1985 Safety Evaluation Re Util 850422 & 0830 Ltrs Concerning Removal of Rod Cluster Control Guide Tube Thimble Plugs. Plan Acceptable Project stage: Approval ML20138H1871985-10-18018 October 1985 Forwards Safety Evaluation Re Util 850422 & 0830 Ltrs Concerning Removal of Rod Cluster Control Guide Tube Thimble Plugs.Plan Acceptable Project stage: Approval 1985-04-22
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Northem States Power Company 414 Ncollet Mall M:nneapohs, Menesota 55401 Telephone (612) 330-5500 I
April 22,1985 Director Office of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Safety Evaluation for RCC Guide Thimble Plue Removal We have completed our safety evaluation for the removal of rod cluster control (RCC) guide thimble plugs and concluded that the change can be done under 10 CFR 50.59. Since the NRC Staff has expressed interest in reviewing this safety evaluation, this report is being submitted for your review. In accordance with 10 CFR Part 170, a $150 check is enclosed as the required application fee.
Completion of your review prior to August of 1985 will allow us time to purchase new thimble plugs if their removal will not be acceptable.
l O kw, David Musolf Manager - Nuclear Supp rt Services DMM/TMP/tp o
c: Regional Administrator-III, NRC NRR Project Manager, NRC Resident Inspector, NRC G Charnoff
Attachment:
Report NSPNAD-8412 jl
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