ML12025A226

Calculation 32-9149958-001, Millstone, Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for Ici Detector Misalignment, (Non-Proprietary)

ML12025A226
Person / Time
Site:	Millstone
Issue date:	01/18/2012
From:	AREVA, AREVA NP
To:	Office of Nuclear Reactor Regulation
References
11-620A, TAC ME6365 32-9149958-001
Download: ML12025A226 (52)

Text

Serial No. 11-620A Docket No. 50-336 RAI Response for MPS2 Cycle 21 COLR ATTACHMENT 2 MILLSTONE UNIT 2 CYCLE 21 PEAKING FACTOR UNCERTAINTY ANALYSIS FOR ICI DETECTOR MISALIGNMENT (NON-PROPRIETARY)

DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNIT 2

0402-01-FOl (Rev. 016, 03/31/2011)

A CALCULATION

SUMMARY

SHEET (CSS)

AREVA Document No. 32 - 9149958 - 001 Safety Related: M Yes F] No Title Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment PURPOSE AND

SUMMARY

OF RESULTS:

Per References 2 and 10, forty-five (45) ICI (Incore Instrumentation) guide tubes were replaced during refueling outage 2R19 in preparation of the startup of Cycle 20. Twenty-six (26) guide tubes were cut 1.375" too short. The location of the 26 shortened guide tubes is identified in Reference 2, PDF page 27 of 27 total. As a result of the guide tubes being cut too short, the ICI's in these locations will have interference which prevents the ICI from reaching its normal height (i.e. the rhodium detector string will bottom out in the tube).

NOTE: This document is the non-proprietary version of 32-9149958-001.

The purpose of this analysis is to evaluate the expected impact on INPAX-II based measured FAH and FQ due to the resultant detector string offset of +1.375 inches for 26 of 45 total detector locations. The resultant bias/penalty will be appropriately combined with the measurement uncertainties previously derived for FAH and FQ in order to determine if the total uncertainties bound [ J respectively (Reference 3, Table 5.2).

This evaluation is based upon the Cycle 21 core design, thus the peaking factor uncertainties listed below are only valid for Cycle 21 operation.

The total uncertainty on FAH, including the impact of the offset ICI detector strings, remains bounded by the criteria of

[ ] documented in Reference 3, Table 5.2.

Assuming the incore monitoring software for Cycle 21 operation will already include a [ ],

uncertainty on the measured Fo, an additional conservative penalty of 1.0025 will be applied for Cycle 21 operation.

THE DOCUMENT CONTAINS ASSUMPTIONS THAT SHALL BE THE FOLLOWING COMPUTER CODES HAVE BEEN USED IN THIS DOCUMENT: VERIFIED PRIOR TO USE CODE/VERSION/REV CODE/VERSION/REV E S See Section 3.3ZN Se SYES Page 1 of 47

A 0402-01-FO1 (Rev. 016, 03/31/2011)

AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Review Method: E Design Review (Detailed Check)

D Alternate Calculation Signature Block Note: P/R/A designates Preparer (P), Reviewer (R), Approver (A);

LP/LR designates Lead Preparer (LP), Lead Reviewer (LR)

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A 0402-01-FO1 (Rev. 016, 03/31/2011)

ARE VA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Record of Revision Page 3 of 47

A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Table of Contents Page SIG NATURE BLOCK ................................................................................................................................ 2 RECO RD O F REVISIO N .......................................................................................................................... 3 LIST O F TABLES ..................................................................................................................................... 6 LIST O F FIGURES ................................................................................................................................... 6 1.0 PURPO SE ..................................................................................................................................... 7 2.0 SUM MARY O F KEY RESULTS .................................................................................................... 8 4.0 KEY ASSUM PTIO NS .................................................................................................................. 13 5.0 CALCULATIO NS ......................................................................................................................... 14 6.0 COMPUTER RUN INDEX ........... . . ................................. ... 35 Page 4 of 47

A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Table of Contents (continued)

[I Page APPENDIX A .......................................................................................................................................... 41 APPENDIX B .......................................................................................................................................... 44 APPENDIX C .......................................................................................................................................... 46 Page 5 of 47

A AR EVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment List of Tables Page Table 3.1 C om puter C odes .................................................................................................................... 12 List of Figures Page None Page 6 of 47

A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 1.0 PURPOSE Per References 2 and 10, forty-five (45) ICI (Incore Instrumentation) guide tubes were replaced during refueling outage 2R19 in preparation of the startup of Cycle 20. Twenty-six (26) guide tubes were cut 1.375" too short.

The location of the 26 shortened guide tubes is identified in Reference 2, PDF page 27 of 27 total. As a result of the guide tubes being cut too short, the ICI's in these locations will have interference which prevents the ICI from reaching its normal height (i.e. the rhodium detector string will bottom out in the tube).

The purpose of this analysis is to evaluate the expected impact on INPAX-II based measured FA and FQ due to the resultant detector string offset of +1.375 inches for 26 of 45 total detector locations. The resultant uncertainty/bias will be appropriately combined with the measurement uncertainties previously derived for FAH and FQ in order to determine if the total uncertainties bound [ ] respectively (Reference 3, Table 5.2).

Page 7 of 47

A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 2.0

SUMMARY

OF KEY RESULTS Per References 2 and 10, forty-five (45) ICI (Incore Instrumentation) guide tubes were replaced during refueling outage 2R19 in preparation of the startup of Cycle 20. Twenty-six (26) guide tubes were cut 1.375" too short.

The location of the 26 shortened guide tubes is identified in Reference 2, PDF page 27 of 27 total. As a result of the guide tubes being cut too short, the ICI's in these locations will have interference which prevents the ICI from reaching its normal height (i.e. the rhodium detector string will bottom out in the tube).

The purpose of this analysis was to evaluate the expected impact on INPAX-II based measured FA and FQ due to the resultant detector string offset of +1.375 inches for 26 of 45 total detector locations.

Total Uncertainty on FA (Includin! impact of offset ICI Detector Strings):

From Section 5.4.2, the maximum error in average assembly power (i.e. assembly power under-prediction) was calculated to be [ ] . From Reference 7, PDF page 37, the current one-sided, 95/95, total FH uncertainty for Millstone Unit 2 is [ ] (rounded up to [ ]. Hence, the total uncertainty on FH, including the impact of the offset ICI detector strings is: [ ] or [ ]

Total Uncertainty on F0 (Ineludinig impact of offset ICI Detector Strings):

Millstone From , Reference Unit 2 7, [ page 37, the Millstone Unit 2 specific, is PDF and is one-sided, bounded by95/95,[ total FQ uncertainty

] in Reference for 3, Table 5.2. Hence, [ ] margin exists to the criteria.

From Section 5.4.2, incorporating the impact of the offset ICI detector strings results in a maximum error in nodal I powe (i.e. nodal power under-prediction) of [ ] for Cycle 21 operation.

Because this analysis was performed using "best-estimate" model for Cycle 21 operation, this under-prediction must be treated as a "bias" (or penalty) to the current total FQ uncertainty. Classifying the under-prediction as a "bias" is a direct result of the under-prediction in nodal power occurring in "limiting" core locations.

Page 8 of 47

A AR EVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 3.0 ANALYTICAL METHODOLOGY 3.1 Methodology This analysis was performed consistent with the methodology prescribed in:

E ]

The methodology is briefly summarized below:

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A AR EVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 4.0 KEY ASSUMPTIONS K J Page 13 of 47

A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 5.0 CALCULATIONS Page 14 of 47

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A AR EVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 3D Relative Difference Distribution E

z I Relative Difference I

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A AR EVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment 6.0 COMPUTER RUN INDEX Page 35 of 47

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A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment

9.0 REFERENCES

1. [ ]

2. 38-9149924-000, Transmission of CORRES-OUT-AREVA-20 100061, Confirmation of Thimble Locations and Assumptions to Support the Millstone Unit 2 ICI Misalignment Evaluation.

3. EMF-96-029(P)(A), Volume 1, 2 and Attachment, Reactor Analysis System for PWRs, Volume I -

Methodology Description and Volume 2 - Benchmarking Results, January 1997.

4. [

5.

10. 38-9126165-000, Transmission of CORRES-OUT-AREVA- 20090060, Rev 0, Add 0, Information Related to Millstone Unit 2 2R19 / Cycle 20 ICI Thimble Tube Evaluation - SUPERSEDES CORRES-OUT-AREVA-20090059-0-0.

11. [

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A ARE VA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Appendix A -

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A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Appendix B -

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A AREVA Document No. 32-9149958-001 Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment Appendix C -

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Serial No. 11-620A Docket No. 50-336 RAI Response for MPS2 Cycle 21 COLR ATTACHMENT 3 AREVA NP AFFIDAVIT DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNIT 2

AFFIDAVIT COMMONWEALTH OF VIRGINIA )

) ss.

CITY OF LYNCHBURG )

1. My name is Gayle F. Elliott. I am Manager, Product Licensing, for AREVA NP Inc. (AREVA NP) and as such I am authorized to execute this Affidavit.

2. I am familiar with the criteria applied by AREVA NP to determine whether certain AREVA NP information is proprietary. I am familiar with the policies established by AREVA NP to ensure the proper application of these criteria.

3. I am familiar with the AREVA NP information contained in the Calculation Summary Sheet (CSS) 32-9149958-001, "Millstone Unit 2 Cycle 21 Peaking Factor Uncertainty Analysis for ICI Detector Misalignment," and referred to herein as "Document." Information contained in this Document has been classified by AREVA NP as proprietary in accordance with the policies established by AREVA NP for the control and protection of proprietary and confidential information.

4. This Document contains information of a proprietary and confidential nature and is of the type customarily held in confidence by AREVA NP and not made available to the public. Based on my experience, I am aware that other companies regard information of the kind contained in this Document as proprietary and confidential.

5. This Document has been made available to the U.S. Nuclear Regulatory Commission in confidence with the request that the information contained in this Document be withheld from public disclosure. The request for withholding of proprietary information is made in accordance with 10 CFR 2.390. The information for which withholding from disclosure is

requested qualifies under 10 CFR 2.390(a)(4) "Trade secrets and commercial or financial information."

6. The following criteria are customarily applied by AREVA NP to determine whether information should be classified as proprietary:

(a) The information reveals details of AREVA NP's research and development plans and programs or their results.

(b) Use of the information by a competitor would permit the competitor to significantly reduce its expenditures, in time or resources, to design, produce, or market a similar product or service.

(c) The information includes test data or analytical techniques concerning a process, methodology, or component, the application of which results in a competitive advantage for AREVA NP.

(d) The information reveals certain distinguishing aspects of a process, methodology, or component, the exclusive use of which provides a competitive advantage for AREVA NP in product optimization or marketability.

(e) The information is vital to a competitive advantage held by AREVA NP, would be helpful to competitors to AREVA NP, and would likely cause substantial harm to the competitive position of AREVA NP.

The information in the Document is considered proprietary for the reasons set forth in paragraph 6(c) above.

7. In accordance with AREVA NP's policies governing the protection and control of information, proprietary information contained in this Document have been made available, on a limited basis, to others outside AREVA NP only as required and under suitable agreement providing for nondisclosure and limited use of the information.

8. AREVA NP policy requires that proprietary information be kept in a secured file or area and distributed on a need-to-know basis.

9. The foregoing statements are true and correct to the best of my knowledge, information, and belief.

SUBSCRIBED before me this day of ,i,2011.

L t tI I !' h

,.....~*:....

Danita R. Kidd 0 ........ t NOTARY PUBLIC, STATE OF VIRGINIA A R V ?ý MY COMMISSION EXPIRES: 12/31/12 Reg. # 205569