JPN-02-023, 10 CFR 50.46 Annual Report - Errors in Emergency Core Cooling System (ECCS) Evaluation Models

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10 CFR 50.46 Annual Report - Errors in Emergency Core Cooling System (ECCS) Evaluation Models
ML022330476
Person / Time
Site: FitzPatrick Constellation icon.png
Issue date: 08/14/2002
From: Kansler M
Entergy Nuclear Northeast, Entergy Nuclear Operations
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
JPN-02-023
Download: ML022330476 (7)


Text

Entergy Nuclear Northeast Entergy Nuclear Operations, Inc 440 Hamilton Avenue Entergy White Plains, NY 10601 Tel 9142723200 Fax 914 272 3205 Michael R. Kansler Senior Vice President &

Chief Operating Officer August 14, 2002 JPN-02-023 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop O-Pl-17 Washington, DC 20555-0001

SUBJECT:

James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 10 CFR 50.46 Annual Report - Errors in Emergency Core Cooling System (ECCS) Evaluation Models

References:

1. Entergy letter, M. Kansler to USNRC dated August 15, 2001 (JPN-01-014) regarding the same subject.

Dear Sir:

The attached report summarizes changes and errors in emergency core cooling system (ECCS) evaluation models in accordance with 10 CFR 50.46(a)(3)(ii) for the period from July 1, 2001 to June 30, 2002 for Entergy's James A. FitzPatrick Nuclear Power Plant.

A total of two changes or errors to the Fit2Patrick model have been identified since the last annual report (Reference 1). Thirty-day reports were not submitted for these errors because they do not qualify as a significant change (a peak cladding temperature change of greater than 50 0 F) according to 10 CFR 50.46(a)(3)(i).

Corrected for these errors, estimated peak cladding temperatures (PCTs) remain below the 2200'F requirement of 10 CFR 50.46(b)(1).

/:VoDCI

No new commitments are contained in this letter. If you have any questions, please contact Ms.

Charlene Faison at 914-272-3378.

Very truly yours, ich~aeI R. Kansle

/ Senior Vice Pr dent and Chief Operati g Officer cc: Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. Guy Vissing, Project Manager Project Directorate I Office of Nuclear Reactor Regulation Mail Stop: OWFN 8C2 One White Flint North 11555 Rockville Pike Rockville, MD 20852 Resident Inspector's Office James A. FitzPatrick Nuclear Power Plant U. S. Nuclear Regulatory Commission P. 0. Box 136 Lycoming, NY 13093

Attachment:

Annual 10 CFR 50.46(a)(3)(ii) Report on Changes or Errors in Emergency Core Cooling System (ECCS) Evaluation Models for the period from July 1, 2001 to June 30, 2002 2

Attachment to JPN-02-023 Annual 10 CFR 50.46(a)(3)(ii) Report on Changes or Errors ini Emergency Core Cooling System (ECCS) Evaluation Models for the period from July 1, 2001 to June 30, 2002 Entergy Nuclear Operations Inc.

James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 INTRODUCTION This report summarizes changes and errors in emergency core cooling system (ECCS) evaluation models in accordance with 10 CFR 50.46(a)(3)(ii) for the period from July 1, 2001 to June 30, 2002 for Entergy's James A. FitzPatrick Nuclear Power Plant.

A total of 2 (two) changes or errors to the FitzPatrick model have been identified since the last annual report (Reference 1). Thirty-day reports were not submitted for these errors because they do not qualify as a significant change (a peak cladding temperature [PCi] change of greater than 50 0F) according to 10 CFR 50.46(a)(3)(i).

Table 1 summarizes the errors or changes to the current Fit2Patrick ECCS evaluation models.

The last two entries represent ECCS evaluation changes or errors identified during the period July 1, 2001 to June 30, 2002.

Additional information on the changes or errors identifed during the reporting period is proVided below.

DISCUSSION OF CHANGES OR ERRORS IDENTIFIED DURING REPORTING PERIOD SAFER Core Spray Iniection Elevation Error In 10 CFR 50.46 Notification Letter 2002-01 (Reference 16), General Electric reported an error in the automation code that prepares the input basedecks br the SAFER analysis. This error resulted in too low a value being calculated for the core spray injection elevation for the lower core spray sparger. As a result of this error, the licensing basis PCTfor all fuel types at FitzPatrick increased by 5 degrees F.

This error changed PCT by less than 50'F. Consequently it did not qualify as a significant change according to 10 CFR 50.46(a)(3)(i) and no 30-dayreport was submitted.

Impact of SAFER Bulk Water Level Error on the Peak Clad Temperature In 10 CFR 50.46 Notification Letter 2002-02 (Reference 17), General Electric reported an error in the initial water level used in some SAFE/REFLOOD and SAFER LOCA analyses. Initial water levels did not properly account for the effect of steam dryer pressure drop. When corrected for dryer pressure drop, the initial bulk water temperature in the vessel is lower than that used in the original SAFE or SAFER analyses. As a result of this error, licensing basis PCT for all fuel types increased by 10 degrees F.

This error changed PCT by less than 50 0F. Consequently it did not qualify as a significant change according to 10 CFR 50.46(a)(3)(i) and no 30-dayreport was submitted.

1

Attachment to JPN-02-023

SUMMARY

Since the last annual 10 CFR 50.46 report (Reference 1), estimated FitzPatrick PCT increased by 15 degrees F. Estimated PCTs, corrected for these errors, remain well below the 2200'F requirement of 10 CFR 50.46(b)(1).

2

Attachment to JPN-02-023 TABLE I -ACCOUNTING OF LICENSING BASIS PEAK CLAD TEMPERATURES FOR FITZPATRICK For the period from July 1, 2001 to June 30, 2002 Estimated Updated Report ECCS PCT Change PCT Period Evaluation GE11 GE12 GE11 GE12 Fuel Fuel Fuel 1993 Fitzpatrick LOCA Baseline N/A 1570°F N/A Analysis (Ref. 7)

Fitzpatrick Reload 12 Baseline Supplemental Report (Ref. 8) N/A Baseline N/A 1370°F Evals.

Fitzpatrick Reload 13 Supplemental Report (Ref. 9). Baseline 1570°F 1370°F 10 CFR 50.46 Notification Regarding Sensitivity To +50°F 1620OF 1420°F Small Input Parameter Changes (Ref. 10)

Prior to 10 CFR 50.46 Notification July 1, Regarding Minor Code +50 F 1625 0 F 1425 0 F 2000 Corrections (Ref. 10) 10 CFR 50.46 Notification Regarding Bottom Head Drain +100 F 1635°F 1435 0 F (Ref. 11) 10 CFR 50.46 Notification Regarding Time Step Size -50 F 1630OF 1430°F (Ref. 3)

Estimated Effect Of July 1, Condensation Error On PCT +90°F 1720OF 1520OF 2000 - (Ref. 12)

June 30, Estimated Effect Of Pressure 2001 Rate Inconsistency Error On +100 F 1730°F 1530°F PCT (Ref. 13)

Estimated Effect Of Accounting Error On PCT N/A -50 F 1730°F 1525 0 F (Ref. 14)

SAFER Core Spray Injection July 1, Elevation Error (Ref. 16.) +50 F 1735 0 F 1530°F 2001 June 30, Impact of SAFER Bulk Water 2002 Level Error on the Peak Clad +100 F 1745 0 F 1540OF Temperature (Ref. 17.).

1

Attachment to JPN-02-023 REFERENCES

1. NYPA letter, M.J. Colomb to USNRC (JAFP-00-0164), dated July21, 2000, regarding reporting of changes and errors in ECCS evaluation models.
2. Entergy Nuclear Operations, Inc. letter, M Kansler to USNRC, (JPN-01-010) dated June 4, 2001, regarding 10 CFR 50.46(a)(3)(ii) 30-dayreport, two errors in ECCS evaluation models.
3. Global Nuclear Fuel letter, A. Alzaben (GNF) to C. Franklin (NYPA), (AFA-00-N061 dated November 20, 2000) regarding 10 CFR 50.46 error report - impact ofSAFER time step size on the peak clad temperature (PCT) for jet pump plant analyses. Includes General Electric/Global Nuclear Fuel 10 CFR 50.46 Notilication Letter 2000-04 dated November 8, 2000 regarding "Impact of SAFER Time Step Size on the Peak Clad Temperature (PCT) for Jet Pump Plant Analyses." (Proprietary)
4. NEDC-23785-1-PA Rev. 1, "The GESTR-LOCA and SAFER Models for the Evaluation of the Loss-Of-Coolant Accident Volume II, SAFER - Long Term Inventory Model for BWR Loss Of-Coolant Analysis," October 1984.
5. NEDC-23785-1-PA Rev. 1, "The GESTR-LOCA and SAFER Models for the Evaluation of the Loss-Of-Coolant Accident Volume III, SAFER/GESTR Application Methodology," October 1984.
6. General Electric Nuclear Energy Report, J 11-03757SRL, August 2000, "Supplemental Reload Licensing Report for James A. FitzPatrick, Reload 14, Cycle 15."
7. General Electric Nuclear Energy, "James A. FitzPatrick Nuclear Power Plant SAFER/GESTER-LOCA, Loss-of-Coolant Analysis," Licensing Topical Report NEDC 31317P, Class III (proprietary), Revision 2, April 1993.
8. General Electric Nuclear Energy Report, J11-02914SRL, Revision 0, August 1996, "Supplemental Reload Licensing Report for James A. FitzPatrick, Reload 12, Cycle 13."
9. General Electric Nuclear Energy Report, J11-03359SRL, Revision 1, Class I, October 1998, "Supplemental Reload Licensing Report for James A. FitzPatrick, Reload 13, Cycle 14."
10. General Electric Nuclear Energy, MFN-090-93, June 30, 1993, "Reporting of Changes and Errors in ECCS Evaluation Models."
11. General Electric Nuclear Energy, MFN-020-96, February 20, 1996, "Reporting of Changes and Errors in ECCS Evaluation Models."
12. General Electric/Global Nuclear Fuel 10 CFR 50.46 Notiication Letter 2001-01 dated May 8, 2001 (via E-mail) regarding "Impact of SAFER Condensation Error on the Peak Clad Temperature (PCT)." (Proprietary) 1

Attachment to JPN-02-023

13. General Electric/Global Nuclear Fuel 10 CFR 50.46 Notifcation Letter 2001-02 dated May 10, 2001 (via E-mail) regarding "Impact of SAFER Pressure Rate Inconsistency Error on the Peak Clad Temperature (PCT)." (Proprietary)
14. Global Nuclear Fuel letter, A. Alzben (GNF) to J. Head (EntergyNuclear Operations, Inc.),

(AFA-01-E004, June 29, 2001) regarding GE12 Upper Bound PCTfor FitzPatrick, (Proprietary).

15. Entergy letter, M. Kansler to USNRC, dated August 15, 2001 (JPN-01-0014) regarding "10 CFR 50.46 Annual Report - Errors in Emergency Core Cooling System (ECCS) Evaluation Models."
16. General Electric/Global Nuclear Fuel 10 CFR 50.46 Notiication Letter 2002-01 regarding "SAFER Core Spray Injection Elevation Error." (Proprietary)
17. General Electric/Global Nuclear Fuel 10 CFR 50.46 Notifcation Letter 2002-02 regarding "Impact of SAFER Bulk Water Level Error on the Peak Clad Temperature (PCT)."

(Proprietary) 2