LIC-03-0056, Annual Report for 2002 Loss of Coolant Accident (Loca)/Emergency Core Cooling System (ECCS) Models Pursuant to 10 CFR 50.46

Annual Report for 2002 Loss of Coolant Accident (Loca)/Emergency Core Cooling System (ECCS) Models Pursuant to 10 CFR 50.46

ML031070511
Person / Time
Site:	Fort Calhoun
Issue date:	04/11/2003
From:	Ridenoure R Omaha Public Power District
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LIC-03-0056
Download: ML031070511 (4)

Text

Omaha Public Power Disit 444 South 16th Street Mall Omaha NE 68102-2247 April 11, 2003 LIC-03-0056 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

References:

1. Docket 50-285

2. XN-NF-82-49(P)(A), Supplement 1, "Exxon Nuclear Company Evaluation Model Revised EXEM PWR Small Break Model," Revision 1, December 1994

3. EMF-2087(P)(A), "SEM/PWR-98: ECCS Evaluation Model for PWR LBLOCA Applications," Revision 0, June 1999

4. Letter from OPPD (R.T. Ridenoure) to NRC (Document Control Desk),

"Annual Report for 2001 Loss of Coolant Accident (LOCA)/Emergency Core Cooling System (ECCS) Models Pursuant to 10 CFR 50.46," dated April 30, 2002 (LIC-02-0054)

SUBJECT:

Annual Report for 2002 Loss of Coolant Accident (LOCA)/Emergency Core Cooling System (ECCS) Models Pursuant to 10 CFR 50.46 In accordance with 10 CFR 50.46(a)(3)(ii), the Omaha Public Power District (OPPD) is submitting the annual 10 CFR 50.46 summary report for 2002. This summary report updates all identified changes or errors in the LOCA/ECCS codes and methods used by Framatome ANP to model Fort Calhoun Station Unit No. 1 (FCS). References 2 and 3, respectively, describe the Small Break (SB) and Large Break (LB) LOCA analysis methodology used by Framatome ANP for modeling plants, such as FCS.

OPPD has received the 2002 Framatome ANP 10 CFR 50.46 Annual Notification Report for the SB and LB LOCA Analyses that are subject to the reporting requirements of 10 CFR 50.46.

For 2002, there were no new Small Break LOCA Analysis Peak Clad Temperature (PCT) 10 CFR 50.46 Model Assessment errors. Attachment 1 provides the 2002 Small Break Peak Clad Temperature Margin Utilization Summary for FCS, which is unchanged from Reference 4. The value of the PCT remains at 1864 'F.

In 2002, a new Large Break LOCA Analysis was performed in support of Technical Specification Amendment No. 209. Previously identified errors were corrected in this reanalysis. The present baseline PCT value is 1956 'F and is reflected in Attachment 2, the 2002 Large Break Peak Clad Temperature Margin Utilization Summary for FCS.

Employment with Equal Opportunity

- i.. U. S. Nuclear Regulatory Commission LIC-03-0056 Page 2 In summary, the FCS PCT values for Small and Large Break LOCAs remain less than the 10 CFR 50.46(b) (1) acceptance criterion of 2200 'F.

If you should have any questions, please contact Dr. Richard Jaworski at (402) 533-6833. No commitments are made to the NRC in this letter.

Sincerely, Attachments:

1. Fort Calhoun Station Small Break LOCA Peak Clad Temperature Margin Utilization Summary

2. Fort Calhoun Station Large Break LOCA Peak Clad Temperature Margin Utilization Summary c: E. W. Merschoff, NRC Regional Administrator, Region IV A. B. Wang, NRC Project Manager J. G. Kramer, NRC Senior Resident Inspector Winston & Strawn

-f LIC-03-0056 Attachment 1 Page 1 Attachment I Fort Calhoun Station Small Break LOCA Peak Clad Temperature Margin Utilization Summary LICENSING BASIS Clad Temp (0F)

Analysis of Record 1865 MARGIN ALLOCATIONS (APGT)

A. Prior Permanent ECCS Model Assessments -1 B. 200210 CFR 50.46 Model Assessments 0 (Permanent Assessments of PCT Margin)

LICENSING BASIS PCT + MARGIN ALLOCATIONS '1864

LIC-03-0056 Page 1 Attachment 2 Fort Calhoun Station Large Break LOCA Peak Clad Temperature Margin Utilization Summary LICENSING BASIS Clad Temp (0F)

Analysis of Record 1956 MARGIN ALLOCATIONS (APCT)

A. Prior Permanent ECCS Model Assessments 0 B. 2002 10 CFR 50.46 Model Assessments 0 (Permanent Assessments of PCT Margin)

LICENSING BASIS PCT + MARGIN ALLOCATIONS 1956