L-MT-10-075, 2010 Report of Changes and Errors in ECCS Evaluation Models for July 2009 Through July 2010

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2010 Report of Changes and Errors in ECCS Evaluation Models for July 2009 Through July 2010
ML103540252
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 12/20/2010
From: O'Connor T
Xcel Energy, Northern States Power Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
L-MT-10-075
Download: ML103540252 (4)


Text

@ Xcel Energy. Monticello Nuclear Generating Plant 2807 W County Road 75 Monticello. MN 55362 December 20,2010 L-MP-7 0-075 10 CFR 50.46(a)(3)

U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Monticello Nuclear Generating Plant Docket 50-263 Renewed Facility Operating License No. DPR-22

Subject:

2010 Report of Changes and Errors in ECCS Evaluation Models

References:

I ) GE Report, NEDC-32514P, Revision 1, "Monticello SAFERIGESTR LOCA Loss of Coolant Accident Analysis," dated October 1997.

2) GE Report, GE-NE-J1103878-09-02P, "Monticello ECCS-LOCA Evaluation for GE14," dated August 2001.
3) NSPM to NRC letter, "2009 Report of Changes and Errors in ECCS Evaluation Models," (L-MT-09-115), dated December 22, 2009.

Pursuant to 10 CFR 50.46(a)(3), the Northern States Power Company, a Minnesota corporation (NSPM), d/b/a Xcel Energy, is providing the annual report of changes or errors identified in the Emergency Core Cooling System (ECCS) evaluation models or application for the Monticello Nuclear Generating Plant (MNGP). This report is for the period between July 2009 and July 2010.

The MNGP Loss of Coolant Accident (LOCA) analyses of record are contained in General Electric (GE) reports submitted for the MNGP rerate (Reference 1) and the LOCA analysis for the GE14 fuel type (Reference 2). The current operating cycle (Monticello Cycle 25) core loading consists of only the GE14 fuel design type.

During the period covered, no notifications of any changes or errors resulting in a change to the calculated Peak Clad Temperature (PCT) were received from GE.

Therefore, the licensing basis PCTs and the PCT Summary provided in Table 1 of is unchanged from the last annual report (Reference 3).

The current adjusted licensing basis PCTs for the fuel types that were used at MNGP during the report period are:

Fuel Type Licensing Basis PCT (OF)

Document Control Desk L-MT-10-075 Page 2 of 2 provides an updated summary table of the applicable changes and errors in the LOCA analyses from when the last analyses of record were performed.

If you have any questions or require additional information, please contact Mr. Richard Loeffler at (763) 295-1247.

Summaw of Commitments mitments and does not revise any existing uclear Generating Plant Enclosure cc: Regional Administrator, Region Ill, USNRC Project Manager, Monticello Nuclear Generating Plant, USNRC Resident Inspector, Monticello Nuclear Generating Plant, USNRC

ENCLOSURE 1 MONTICELLO NUCLEAR GENERATING PLANT TABLE 1 -

SUMMARY

OF MONTICELLO LOCA CHANGES AND ERRORS INVOLVING CHANGES IN PEAK CLADDING TEMPERATURE (PCT)

L-MT-10-075 Page 1 of 1 TABLE 1 -

SUMMARY

OF MONTICELLO LOCA CHANGES AND ERRORS INVOLVING CHANGES IN PEAK CLADDING TEMPERATURE (PCT)

Licensing Applicable Analysis or Error Description Ref. Basis PCT("F)

GE14 NEDC-32514P, Rev 1, Monticello SAFERIGESTR-LOCA ----

1 Loss of Coolant Accident Analysis GE-NE-J1103878-09-02P, Monticello ECCS-LOCA 2 4960 Evaluation for GE14 lmpact of SAFER Level/Volume Table Error on PCT (Notification Letter 2003-01) 3 - 15 Level and volume tables used by SAFER were not updated when a revised initial water level was implemented.

lmpact of Top Peaked Power Shape for Small Break LOCA Analysis (Notification Letter 2006-01)

Small Break LOCA analyses had assumed a mid-peaked axial 4 +30 power shape consistent with the DBA break analysis. It was determined that a top-peaked axial power shape can result in higher calculated PCT.

Sum of absolute value of changes during the current reporting period. 0 Sum of absolute value of changes since last AOR. 45 Algebraic sum of changes during the current reporting period. 0 Algebraic sum of changes since last AOR. + I5 Current Adjusted Peak Cladding Temperature 4975 References

1. GE Report: NEDC-32514P, Revision 1, "Monticello SAFERIGESTR - LOCA Loss-of-Coolant Accident Analysis," dated October 1997.
2. GE-NE-J1103878-09-02P, Monticello ECCS-LOCA Evaluation for GE14," dated August 2001.
3. 10 CFR 50.46 Notification Letter 2003-01, "lmpact of SAFER LevelNolume Table Error on the Peak Clad Temperature (PCT)," dated May 6, 2003.
4. 10 CFR 50.46 Notification Letter 2006-01, "lmpact of Top Peaked Power Shape for Small Break LOCA Analysis," dated July 28, 2006.