ML20136F535
| ML20136F535 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 12/30/1985 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8601070422 | |
| Download: ML20136F535 (2) | |
Text
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Northern States Power Company 414 Nicollet Mall Minneapohs. Minnesota 55401 Telephone (612) 330-5500
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December 30, 1985 f N,C 9Ei p =-
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Mr James G Keppler MCRT Regional Administrator I
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U S Nuclear Regulatory Comr;ission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Systematic Review of Seismic Category I Piping and Supports Seismic Category I Piping Review Program Status Report By letter dated June 8, 1981 a commitment was made to submit six-month status reports on the Monticello Seismic Category I Review Program. The purpose is to provide a report on project status through the end of December 1985.
Seismic Category I Piping Review Program modifications are being installed so that the models used for dynamic analysis conform to current modeling techniques wi:hout being excessively complicated 1.e., models and submodels have been segregated by installation of anchors and the number of supports involved with multiple systems are being reduced. Measurer, have been taken to limit the number of modifications which affect system operability.
Modifications which do affect system operability are perforu d when system operability is not required. These guidelines are being utilized for all systems included in the program.
The program has been divided into two phases. thate One activities are complete. The following system breakdown provides a status of Phase Two activities:
Hig'a Pressure Coolant Injection System Phase Two activities consist of three models. The status for each are as follows:
Modal 1:
P17fng evaluation, support design and installation software is complete.
Modification installation is near completion.
Model 2 & 3: Piping evaluation, support design and installation software complete. Modification is in progress.
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i Mr James C Kcpplsr December 30, 1985
-Page 2 Nodhom States Power Company Reactor Core Isolation Cooling System piping evaluation, support design and support installations for Phase Two segments are complete.
Core Spray Pump Discharge System Phase Two piping evaluation, support design and modification installations are complete.
Residual Heat Removal Pump Discharge System Phase Two piping evaluation, support design and installation software are complete.
Modification installation is in progress.
Primary Reactor Steam (Main Steam) System and Safety Relief Valve Lines, Phase Two piping evaluation are in progress.
Reactor Cater Clean Up System Phase Two piping evaluation is complete, installation software preparacion is in progress.
Feedwater System Phase Two piping evaluation and support design is in progress.
Please contacc us if you have any questions related to the information we have provided.
Very truly you
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N C E Larson Vice President Nuclear Generation CEL/DMM/le ec G Charnoff P L Hartman, NRC Resident Inspector i