US-APWRIncore Power Distribution Evaluation Methodology

[Pages:58]US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

US-APWR Incore Power Distribution Evaluation Methodology

Non-Proprietary Version

December 2007 ? 2007 Mitsubishi Heavy Industries, Ltd.

All Rights Reserved

Mitsubishi Heavy Industries, LTD.

US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

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Mitsubishi Heavy Industries, LTD.

US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

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Description Original issued

Mitsubishi Heavy Industries, LTD.

US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

?2007

MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved

This document has been prepared by Mitsubishi Heavy Industries, Ltd. ("MHI") in connection with the U.S. Nuclear Regulatory Commission's ("NRC") licensing review of MHI's US-APWR nuclear power plant design. No right to disclose, use or copy any of the information in this document, other that by the NRC and its contractors in support of the licensing review of the US-APWR, is authorized without the express written permission of MHI.

This document contains technology information and intellectual property relating to the US-APWR and it is delivered to the NRC on the express condition that it not be disclosed, copied or reproduced in whole or in part, or used for the benefit of anyone other than MHI without the express written permission of MHI, except as set forth in the previous paragraph. This document is protected by the laws of Japan, U.S. copyright law, international treaties and conventions, and the applicable laws of any country where it is being used.

Mitsubishi Heavy Industries, Ltd. 16-5, Konan 2-chome, Minato-ku

Tokyo 108-8215 Japan

Mitsubishi Heavy Industries, LTD.

US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

Abstract

This report describes the method for determination of the incore power distribution to be used in the US-APWR core. Using the same method employed for Japanese Mitsubishi PWRs, incore power distribution measurements are periodically performed for core operation management and for surveillance as described in the Technical Specifications. A summary description of the INCORE-M code method, which is used for measurement data processing, is given. In addition, uncertainty factors evaluation results are provided in this report. Many of the uncertainties applied to the US-APWR using INCORE-M are identical to values applied to other PWRs using this method. However, the unique US-APWR design feature has been considered when determining total uncertainty factors. It is concluded that the appropriate uncertainty on power peaking factors are applied to the US-APWR safety analyses and core surveillance.

Mitsubishi Heavy Industries, LTD. ii

US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

Table of Contents

List of Tables

;

iv

List of Figures

v

List of Acronyms

vii

1.0 INTRODUCTION

1

2.0 SUMMARY OF INCORE NUCLEAR INSTRUMENTATION SYSTEM

2

3.0 INCORE POWER DISTRIBUTION DETERMINATION METHOD

6

3.1 MD Data Processing

6

3.2 Source Deck

7

3.3 Incore Power Distribution Determination

8

3.4 Power Peaking Factor Evaluation

9

4.0 INCORE-M CODE

10

4.1 General Description

10

4.2 Input Data

10

4.3 Output Data

;

11

5.0 UNCERTAINTY EVALUATION FOR POWER PEAKING FACTORS

18

5.1 General Description of Uncertainty Analysis

18

5.2 Methodology of Uncertainty Analysis

18

5.3 Extrapolation Uncertainty Evaluation

21

5.3.1 Method

21

5.3.2 Results

22

5.4 Uncertainties Evaluation of Power Peaking Factors

23

5.5 Uncertainty Factors Determination

24

6.0 CONCLUSION

31

7.0 REFERENCES

32

Appendix-A Study on the Effect of Instrumentation Thimble Failure for the US-APWR

33

A.1 INTRODUCTION

33

A.2 EVALUATION METHOD

34

A.3 RESULTS

37

A.4 CONCLUSION

37

Mitsubishi Heavy Industries, LTD. iii

US-APWR Incore Power Distribution Evaluation Methodology

List of Tables

MUAP-07021-NP (RO)

Table 5-1 Cycle and Burnup Used for Extrapolation Uncertainty Evaluation

25

Table 5-2 Extrapolation Error Evaluation for CY-8, BOC

26

Table 5-3 Summary of Extrapolation Error Evaluation for Each Map

27

Table 5-4 Extrapolation Error Evaluation Result

28

Table 5-5 Summary of Evaluation of Power Peaking Factor Uncertainties

28

Table A-1 Summary of Simulation Cases

39

Mitsubishi Heavy Industries, LTD. iv

US-APWR Incore Power Distribution Evaluation Methodology

MUAP-07021-NP (RO)

List of Figures

Figure 2-1 Basic System for Insertion of Movable Neutron Detectors

.4

Figure 2-2 Radial Distribution of Instrumented Locations for the US-APWR

5

Figure 4-1 Example of INCORE-M Output

(MD Data used for Power Distribution Determination)

12

Figure 4-2 Example of INCORE-M Output (Axial Power Distribution)

13

Figure 4-3 Example of INCORE-M Output (Radial Power Distribution)

;

14

Figure 4-4 Example of INCORE-M Output (Top Twenty of Fo)

15

Figure 4-5 Example of INCORE-M Output (Axial Profile of Fo)

16

Figure 4-6 Example of INCORE-M Output (Summary)

17

Figure 5-1 Instrument Locations at 4-loop Core that Used

for Extrapolation Error Evaluation

29

Figure 5-2 Summary of Extrapolation Error Evaluation

30

Figure A-1 Instrumentation Thimble Reduction Evaluation Process

.40

Figure A-2 A Comparison of Assembly Power Distribution

between Unperturbed Core model and Perturbed Core model

(First Core, MOC, Type-D Perturbation)

.41

Figure A-3 Example of Proximity Limitation for Thimble Failures

42

Figure A-4 A Comparison of Measured Assembly Power Distribution

between Reference Case and Thimble Deletion Case

(First Core, MOC, Type-D Perturbation, 1 Thimble Failure)

43

Figure A-5 A Comparison of Measured Assembly Power Distribution

between Reference Case and Thimble Deletion Case

(First core, MOC, Type-D Perturbation, 2 Thimbles Failure)

.44

Figure A-6 A Comparison of Measured Assembly Power Distribution

between Reference Case and Thimble Deletion Case

(First Core, MOC, Type-D Perturbation, 3 Thimbles Failure)

.45

Figure A-7 A Comparison of Measured Assembly Power Distribution

between Reference Case and Thimble Deletion Case

(First Core, MOC, Type-D Perturbation, 5 Thimbles Failure)

.46

Mitsubishi Heavy Industries, LTD.

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