ML20113C640

Repts Changes to ECCS Models Which Have Occurred Since Last Analysis of Record of GE10 & GE11 Fuel Types,Currently in Monticello Cycle 18 Core.Summary of Model Changes & Associated PCT Also Provided

ML20113C640
Person / Time
Site:	Monticello
Issue date:	06/18/1996
From:	Richard Anderson NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9607020027
Download: ML20113C640 (3)

Text

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Northem States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 1927 Telephone (612) '330-5500 June 18,1996 10CFR Part 50 Section 50.46(a)(3)

US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Reoort of Corrections to ECCS Evaluation Models Historically, General Electric (GE) has reported changes and errors to the ECCS evaluation models that are applicable to Monticello. It appeared that these GE letters satisfied NSP's reporting requirements, but it recently came to our attention that the licensee is specifically required to report the changes. The purpose of this letter is tc report changes to the ECCS models that have occurred since the last analysis of record for GE10 and i GE11 fuel types, which are currently in the Monticello Cycle 18 core.

A summary of the model changes and the associated peak clad temperatures (PCTs)is provided in the Attachment. These changes will be incorporated as the analysis of record in the SAFER /GESTR-LOCA anclysis performed in support of the Monticello Power Rerate program. It is planned that the Monticello Rerate license amendment request will be submitted in the near future.

Please cacct Mel Opstad at (612) 295-1653 if you require further information.

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1 (f h Dn:h/H*?'

' Roger O Andersori Director Licensing r,;ri Management Issues

Attachment:

c: Regional Administrator - til, NRC NRR Project Manager, NRC Sr Resident inspector, NRC State of Minnesota i Attn: Kris Sanda J E Silberg fCO'

. m -me,.,= mm. e

' 9607020027 960618 g PDR ADOCK 05000263 P PDR

ATTACHMENT June 18,1996 l CHANGES TO ECCS EVALUATION MODELS FOR GE11 FUEL Description PCT ('F) Reference Analysis of Record 2087 Reference 2 Bottom Head Drain +10 References 1,3 PCT plus Change 2097 CHANGES TO ECCS EVALUATION MODELS FOR GE10 FUEL Description PCT ('F) Reference Analysis of Record 1769 References 5,6 LPCI injection in Jet Pump References 1,4 l150l SAFER Initialization References 1,4 l15l Bottom Head Drain +10 References 1,3 PCT plus Changes 1834 *

• • Note that this is an upper limit on the value of PCT plus Changes.

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• ATTACHMENT

, . . June 18,1996

References:

1) GE Letter, C J Papandrea to Kirk S Schnoebelen (NSP), " Additional Information Regarding the Reporting of Changes and Errors in ECCS Evaluation Models" dated May 19,1996.

. 2) GE Letter, C J Papandrea to Kirk S Schnoebelen (NSP), "GE11 SAFER /GESTR-LOCA i

Results for Monticello Reload 17, Cycle 18 - Proprietary information," dated April 1, 1996.

! 3) GE Letter, R J Reda to the Document Control Desk, " Reporting of Changes and Errors in ECCS Evaluation Models" dated February 20,1996 (MFN-020-96). (Note j '

that this letter was transmitted to NSP by GE letter irom C J Papandrea to Kirk S Schnoebeten, " Reporting of Changes and Errors in ECCS Evaluation Models" dated

, March 13,1996.)

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4) GE Letter, R C Mnchell to the Office of Nuclear Reactor Regulation, " Reporting of Changes and Errors in ECCS Evaluation Models" dated June 30,1993 (MFN-090-93).

5) NEDC-31786P, "Monticello SAFER /GESTR-LOCA Loss-of -Coolant Accident Analysis", dated December 1990. (Note that this report was transmitted to NSP by GE letter from G D Plotycia to D P Austin, "Monticello, SAFER /GESTR Licensing Report" dated December 13,1990.) l 1

6) GE letter from G D Plotycia to D P Austin, "Monticello Reload 14, Cycle 15 - Base j Scope Reload Fuel Services Analyses Results" dated December 13,1990. j I

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