ML20090L818
| ML20090L818 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 05/07/1976 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9102130402 | |
| Download: ML20090L818 (4) | |
Text
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NSF NORTHERN 5TATES POWER COMPANY wiss a Apou e. wiw s u eorA es.ot f
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May 7, 1976
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Mr Victor Stello, Director
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Dear Mr Stello:
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MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Mark I Containment Evaluation Short Term Program Northern States Power Company has joined with other utilities having Mark I pressure suppression type containments in a re-evaluation of their containment systems.
Recent investigation by General Electric of the pressure suppression phenomena has identified dynamic load conditions not explicitly addressed in the original design. A generic Short Tem Program was initiated by the Mark I utility group to assess the capability of the ccntainment to perform its intended function when subjected to the most probable hydrodynamic loads resulting from a postulated LOCA event.
This Mark I Short Term Program is nearing completion.
The final task of this evaluation is a plant-unique structural analysis of the torus support system.
On April 26, 1976, Gen-eral Electric, at the request of the Mark I Owners Group, trans-mitted to you, a proposed utility action plan for the submittal of this plant-unique structural evaluation of the torus support systems.
We have reviewed the information presented by General Electric in their April 26 letter and have determined that the proposal presented is applicable to the action planned for the Monticello Nuclear Generating Plant, by Northern States Power Company. That is, General Electric will submit for the Mark I Owners, Addendum No. 2 to NEDC-20989 (Mark 1 Containment Evaluation-Short Term Program-Final Report) which will identify dynamic loads to be used in the plant-unique torus support system structural analysia.
Northern States Power Company will submit a separate plant unique torus support system structural analysis report using the loads identified in NEDC-20989, Addendum No. 2 for Monticello. A des-cription of the analysis to be performed on torus support system and attached piping is provided in NUTECH Report MK I-02-012, which is attached to GE's April 26 letter to you.
9102130402 760507 PDR ADOCK 05000263 P
NORTI RN CTATEC POWER COM AN Y Mr Victor Stello
-2 May 7,1976
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NUTECil, Inc., will perform the structural analysis for the Monticello torus support system evaluation.
The results of this analysis will be used to determine if further action will be necessary as a basis for continued operation during the perfomance of the long tem structural evaluation for Monticello. A report will be prepared to document the re-suits of the structural analysis and sulunitted to the NRC by about August 1, 1976 Yours very truly, L 0 Mayer, PE Manager, Nuclear Support Services LGi/LLT/ deb cc:
J G Keppler G Charnoff MPCA Attn:
J W Fennan 1
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- e UNITED STATES NUCLEAR REGUIATORY COMMISSION NORTHERN STATES POWER COMPANY MONTICELID NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 LETIER DATED MAY 7, 1976 RESPONDING TO NRC REQUESTS FOR INFORMATION ON CONTAINMENT DESIGN 1
Northern States Power Company, a Minnesota corporation, by this letter dated May 7, 1976 hereby submits information in response to NRC requests for information concerning the Mark I Containment.
This request contains no restricted or other defense information.
NORTHERN STATES POWER COMPANY By GhAN>
L W Wachter Vice President, Power Production
& System Operation On this 7th ay of May 1976, before me a notary public in and for d
said County, personally appeared L J Wachter, Vice President, Power Production and System Operation, and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Cwapany, that he knows the contents thereof and that to the best of his knowledge, information and belief, the statements made in it are true and that it is not interposed for delay.
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