ML20137P775

to Final Rept CENPD-279, Annual Rept on Abb CE ECCS Performance Evaluation Models

ML20137P775
Person / Time
Site:	Calvert Cliffs
Issue date:	02/28/1997
From:	C-E OPERATING PLANTS OWNERS GROUP
To:
Shared Package
ML20137P772	List: ML20137P770 ML20137P775
References
CENPD-279, CENPD-279-S08, CENPD-279-S8, NUDOCS 9704100004
Download: ML20137P775 (9)

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COMBUSTION ENGINEERING OWNERS GROUP CENPD-279 SUPPLEMENT 8 .

ANNUAL REPORT ON ABB CE ECCS PERFORMANCE EVALUATION MODELS FINAL REPORT CEOG TASK 975 prepared for the C-II OWNERS GROUP February 1997

• Copyright 1997 Combustion Engineering, Inc. All rights reserved ABB Combustion Engineering Nuclear nnamtions F F F

$8"S000k OE0b g,

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LEGAL NOTICE

<Thi s report was prepared as an account of wor ksponsored by the Combustion Engineering LOwners Group and ABB Combustion Engineering. Neither Combustion Engineering, Inc. nor j any person acting on its behalf:

, A. makes any warranty or representatiori, express or implied including the warranties of fitness for a particular purpose or merchantability, with respect to the accuracy, ,

completeness, or usefulness of the information contained in this report, or that the use of

any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or ,

i B. assumes any liabilities with respect to the use of, or for damages resulting from the use of, j any information, apparatus, method or process disclosed in this report.  ;

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. Combustion Engineering, Inc.

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-' ABSTRACT This report describes changes and errors in the ABB Combustion Engineering evaluation models for ECCS performance analysis in 1996 per the requirements of 10CFR50.46. For this reponing

- period, there were no changes or errors in the evaluation models or application of the models.-

The sum of the absolute magnitude of the PCT changes for large break LOCA from all reports to date continues to be less than 1 F. No change occured in the PCT for small break LOCA or post-LOCA long term cooling. Per the criteria of 10CFR50.46, no action beyond this annual report is required.

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I TABLE OF CONTENTS )

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1.0 INTRODUCTION

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1 2.0 ABB CE CODES USED FOR ECCS EVALUATION 3 I 3.0 EVALUATION MODEL CIIANGES AND ERROR CORRECTIONS 4

4.0 CONCLUSION

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l' j 1,0 ~ INTRODUCTION - I 1

This report addresses the NRC requirement to report changes or errors in ECCS performance evaluation models. The ECCS Acceptance Criteria, Reference 1, spells out reporting i J

requirements and actions required when errors are corrected or changes are made in an evaluation model or in the application of a model for an operating licensee or construction permittee of a  ;

nuclear power plant. 1 i

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. i The action requirements in 10CFR50.46(a)(3) are: l I

1. - Each applicant for or holder of an operating license or construction permit shall  !

estimate the effect of any change to or error in an acceptable evaluation model or i i

in the application of such a model to determine if the change or error is significant. j P For this purpose, a significant change or error is one which results in a calculated I peak fuel cladding temperature (PCT) different by more than 50 F from the temperature calculated for the limiting transient using the last acceptable model, or is a cumulation of changes and errors such that the sum of the absolute magnitudes of the respective temperature charces is greater than 50 F. j I  ;

2. For each change to or error discovered in an acceptable evaluation model or in the a

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application of such a model that affects the temperature calculation, the applicant

- or licensee shall report the nature of the change or error and its estimated effect on the limiting ECCS analysis to the Commissien at least annually as specified in 10CFR50.4, I l

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3. If the change or error is significant, the applicant or licensee shall provide this

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report within 30 days and include with the report a proposed schedule for providing a reanalysis or taking other action as may be needed to show compliance with 10CFR50.46 requirements. This schedule may be developed using an integrated scheduling system previously approved for the facility by the NRC. For those facilities not using an NRC approved integrated scheduling system, a schedule will be established by the NRC staffwithin 60 days of receipt of the ,

proposed schedule.  !

4,' Any change or error correction that results in a calculated ECCS performance that  !

does not conform to the criteria set forth in paragraph (b) of 10CFR50.46 is a reportable event as described in 10CFR50.55(e), 50.72 and 50.73. The affected applicant or licensee shall propose immediate steps to demonstrate compliance or ,

bring plant design or operation into compliance with 10CFR50.46 requirements. l This report documents all the errors corrected in and/or changes to the presently licensed ABB ,

- CE ECCS performance evaluation models, made in the year covered by this report, which have ,

not been reviewed by the NRC staff. This document is provided to satisfy the reporting requirements of the second item above. ABB CE reports for earlier years are given in References i l-

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2.0 - ABB CE CODES USED FOR ECCS EVALUATION ABB CE uses several digital computer codes for ECCS puformance analysis that are described in ,

topical reports, are licensed by the NRC, and are covered by the provisions of 10CFR50.46.

Those for large break LOCA calculations are CEFLASH-4A, COMPERC-II, HCROSS, PARCH, STRIKIN-II, and COMZIRC, CEFLASH-4AS is used in conjunction with COMPERC-II, STRIKIN-II, and PARCH for , U break LOCA calculations. The codes for post-LOCA long term cooling analysis are BOR&, CEPAC, NATFLOW, and CELDA.

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3.0 EyJ ATION MODEL CHANGES AND ERROR CORRECTIONS This section discusses all error corrections and model changes to the ABB CE ECCS performance evaluation models which may affect the calculated PCT.

There were no changes to the ECCS evaluation models or changes to their application for calendar year 1996.

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4.0 CONCLUSION

S There were no changes or errors in the evaluation models or their application for large break -

LOCA, small break LOCA, or post-LOCA analysis during 1996; consequently, there was no change in the PCT. The sum of the chtclute magnitude of the changes in PCT calculated using the CE ECCS evaluation models, including those from previous annual reports, References 2-9, remains less than 1 F.

_, . Based on the results reported here, there was no significant change in the sense of 10CFR50.46 in calendar year 1996 and no action beyond the submission of this report is needed.

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-e-5.0 . REFERENCES 5 .j i

1. " Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear i Power Reactors," Code of Federal Regulations, Title 10, Part 50, Section 50.46.

2c " Annual Report on C-E ECCS Codes and Methods for 10CFR50.46," CENPD-279, April, ,

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3. " Annual Report on C-E ECCS Codes and Methods for 10CFR50.46," CENPD-279, Supplement 1, February,1990. 'l 4; ." Annual Report on C-E ECCS Codes and Methods for 10CFR50.46," CENPD-279, Supplement 2, April,1991.

'5. " Annual Report on C-E ECCS Codes and Methods for 10CFR50.46," CENPD-279, )

Supplement 3, April,1992.

6. " Annual Report on C-E ECCS Codes and Methods for 10CFR50.46," CENPD-279, Supplement 4, April,1993.

7. " Annual Report on C-E ECCS Codes and Methods for 10CFR50.46," CENPD-279, Supplement 5, February,1994.

8. " Annual Report on ABB C-E ECCS Performance Evaluation Models," CENPD-279, Supplement 6, February,1995.

9. " Annual Report on ABB C-E ECCS Performance Evaluation Models," CENPD-279, Supplement 7, February,1996.

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