ML040280458

Licensee Qualification for Performing Dynamic Rod Worth Measurement Analysis

ML040280458
Person / Time
Site:	Millstone
Issue date:	01/21/2004
From:	Hartz L Dominion Nuclear Connecticut
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
04-005
Download: ML040280458 (12)

Text

Dominion Nuclear Connecticut, Inc.

Millstone Power Station m

Rope Ferry Road Waterford, CT 06385 January 21, 2004 U.S. Nuclear Regulatory Commission Serial No.:

04-005 Attention: Document Control Desk NL&OS/PRW Rev 0 Washington, DC 20555 Docket No.:

50-423 License No.:

NFP-49 DOMINION NUCLEAR CONNECTICUT, INC. (DNC)

MILLSTONE POWER STATION UNIT 3 LICENSEE QUALIFICATION FOR PERFORMING DYNAMIC ROD WORTH MEASUREMENT ANALYSIS Dominion Nuclear Connecticut, Inc. (DNC) intends to use Westinghouse supplied methods to perform physics calculations in support of Dynamic Rod Worth Measurement (DRWM) for low power physics testing of Millstone Unit 3. This testing will take place on or about May 1, 2004. The Safety Evaluation Report issued by the Nuclear Regulatory Commission (NRC) for WCAP-13360-P-A, "Westinghouse Dynamic Rod Worth Measurement Technique" contains the requirement to provide to the NRC confirmation that the competencies to perform DRWM design calculations will be demonstrated. Attachments 1 and 2 demonstrate that these criteria have been met for Millstone Unit 3. Documentation of training, qualification and benchmark calculations is available at the Millstone site for NRC review.

There are no regulatory commitments contained within this letter.

If you should have any questions regarding this submittal, please contact Mr. Paul R.

Willoughby at (804) 273-3572.

Very truly yours, Leslie N. Hartz Vice President - Nuclear Engineering Attachments (2)

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis cc:

U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 Mr. V. Nerses Senior Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8C2 Rockville, MD 20852-2738 Mr. S. M. Schneider NRC Senior Resident Inspector Millstone Power Station The Director, Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Millstone Power Station Unit 3 Demonstration of the Ability To Perform Computations to Support Dynamic Rod Worth Measurements

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 1 Millstone Power Station Unit 3 Demonstration of the Ability To Perform Computations to Support Dynamic Rod Worth Measurements

1.0 INTRODUCTION

Westinghouse performed the initial application of Dynamic Rod Worth Measurements (DRWM) at Millstone Unit 3 on March 21, 2001.

A subsequent application was performed on October 4, 2002. Dominion Nuclear Connecticut (DNC) now intends to perform the analytical computations necessary to support the DRWM. contains the criteria identified in the Nuclear Regulatory Commission (NRC) SER and is required to be addressed in order to perform computations to support DRWM. Successfully meeting these criteria constitutes inherent approval to use DRWM in Low Power Physics Testing (LPPT). This report demonstrates that these criteria have been met.

Personnel performing computations to support DRWM were trained by Westinghouse in these computations on November 4 and 5, 2002 and received procedures on how to perform these computations at that time. This training included the ability to set up input, understand and interpret output results, understand applications and limitations, and to perform analyses in compliance with the procedures provided by Westinghouse.

Cross sections to support DRWM computations were obtained from the PHOENIX-P lattice physics code (See Reference [1]). The flux solutions for these computations are obtained from the ANC code (see Reference [2]). NRC review and approval of these codes and associated procedures is contained in Reference [3]. Application of these codes and procedures and the Westinghouse DRWM procedure is controlled by the DNC quality assurance program defined in Reference [4]. This quality assurance program meets the requirements of 10 CFR 50, Appendix B.

2.0 COMPARISON OF RESULTS TABLE 1 provides the DRWM measured and predicted rod worths based on Westinghouse predictions for the Millstone Unit 3 Cycle 9 LPPT. TABLE 2 provides the DRWM measured and predicted rod worths based on DNC predictions for the Millstone Unit 3 Cycle 9 LPPT.

TABLE 3 compares the predicted rod worths based on Westinghouse and DNC data.

TABLE 4 compares the rod worths measured by the DRWM technique to support the measured data using Westinghouse analytical data and DNC analytical data.

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 2 3.0 DISCUSSION OF RESULTS Comparing Westinghouse and DNC predicted results, it can be seen from TABLE 3 that the maximum percent difference in the predicted worth of any bank is 0.0%, and the maximum pcm difference in the predicted worth of any bank is 0.1 pcm occurring in several banks. The difference in the total predicted rod worth is 0.0% or 0.2 pcm.

Comparing measured results based on Westinghouse and DNC supporting analytical data, it can be seen from TABLE 4 that the maximum percent difference in the measured worth of any bank is 0.3% occurring in Control Bank A, and the maximum pcm difference in the measured worth of any bank is 2.9 pcm occurring in Control Bank A. The difference in the total measured rod worth is 0.2% or 8.2 pcm.

4.0 CONCLUSION

S Based on the results in Section 2.0 and the discussions of results in Section 3.0, it is concluded that the review criteria in the document in ATTACHMENT 2 have been met.

Therefore, DNC has demonstrated the qualification to perform its own analytical computations to support DRWM tests for future LPPT. The first application of DNC analytical computations to support DRWM in LPPT will occur with the start up of Millstone Unit 3 Cycle 10, which will occur on or about May 01, 2004.

5.0 REFERENCES

1. Nguyen, T. Q., et. al., Qualification of the PHOENIX-P/ANC Nuclear Design System for Pressurized Water Reactor Cores, WCAP-11596-P-A (Proprietary) and WCAP-11597-P-A (Nonproprietary), June 1988.

2. Liu, Y. S., Meliksetian, A., Rathkopf, J. A., Little, D. C., Nakano, F., Poploski, M. J.,

ANC -

A Westinghouse Advanced Nodal Computer Code, WCAP-10965-P-A (Proprietary) and WCAP-10966-P-A (Nonproprietary), December 1985.

3. Bordelon, F. M., et. al., Westinghouse Reload Safety Evaluation Methodology, WCAP-9272-P-A (Proprietary), July 1985.

4. Quality Assurance Program (QAP) Topical Report -

Millstone Power Station, Revision 25.

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 3 TABLE 1 MEASURED AND PREDICTED ROD WORTHS BASED ON WESTINGHOUSE PREDICTIONS

[

WORTH (pcm)

DIFFERENCE BANK Measured Predicted

% (M-P/P) pcm (M-P)

CA 915.3 899.4 1.8 15.9 CB 513.7 533.1

-3.6

-19.4 CC 828.3 844.6

-1.9

-16.3 CD 611.6 588.5 3.9 23.1 SA 435.4 421.1 3.4 14.3 SB 875.2 895.7

-2.3

-20.5 SC 335.4 340.6

-1.5

-5.2 SD 339.8 339.5 0.1 0.3 SE 49.5 51.4

-3.7

-1.9 TOTAL 4904.2 4913.9

-0.2

-9.7

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 4 TABLE 2 MEASURED AND PREDICTED ROD WORTHS BASED ON DNC PREDICTIONS WORTH (pcm)

J DIFFERENCE BANK Measured l

Predicted l

% (M-PIP) l pcm (M-P)

CA 918.2 899.5 2.1 18.7 CB 513.9 533.1

-3.6

-19.2 CC 830.7 844.5

-1.6

-13.8 CD 611.8 588.5 4.0 23.3 SA 435.6 421.1 3.4 14.5 SB 877.4 895.7

-2.0

-18.3 SC 336.2 340.7

-1.3

-4.5 SD 339.0 339.6

-0.2

-0.6 SE 49.6 51.4

-3.5

-1.8 TOTAL 4912.4 4914.1 0.0

-1.7

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 5 TABLE 3 COMPARISON OF PREDICTED ROD WORTHS BASED ON WESTINGHOUSE AND DNC DATA PREDICTED ROD WORTH (pcm)

DIFFERENCE BANK Westinghouse DNC

% (D - W)/W pcm (D-W)

CA 899.4 899.5 0.0 0.1 CB 533.1 533.1 0.0 0.0 CC 844.6 844.5 0.0

-0.1 CD 588.5 588.5 0.0 0.0 SA 421.1 421.1 0.0 0.0 SB 895.7 895.7 0.0 0.0 SC 340.6 340.7 0.0 0.1 SD 339.5 339.6 0.0 0.1 SE 51.4 51.4 0.0 0.0 TOTAL 4913.9 4914.1 0.0 0.2

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 6 TABLE 4 COMPARISON OF MEASURED ROD WORTHS BASED ON WESTINGHOUSE AND DNC SUPPORTING ANALYTICAL DATA BANK MEASURED ROD WORTH (pcm) l DIFFERENCE BANK Westinghouse l DNC

% (D -W)/W lpcm (D-W)l CA 915.3 918.2 0.3 2.9 CB 513.7 513.9 0.0 0.2 CC 828.3 830.7 0.3 2.4 CD 611.6 611.8 0.0 0.2 SA 435.4 435.6 0.0 0.2 SB 875.2 877.4 0.3 2.2 SC 335.4 336.2 0.2 0.8 SD 339.8 339.0

-0.2

-0.8 SE 49.5 49.6 0.2 0.1 TOTAL 4904.2 4912.4 0.2 8.2

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Millstone Power Station Unit 3 Criteria From WCAP-1 3360-P-A For A Utility Performing Dynamic Rod Worth Measurements Computations

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 1 Criteria From WCAP-1 3360-P-A For Performing Dynamic Rod Worth Measurements Computations In order to independently perform physics calculations to support the use of the Dynamic Rod Worth Measurement (DRWM) technique during the Low Power Physics Testing (LPPT), the following five criteria must be met. Compliance with the following five criteria demonstrates qualification and constitutes inherent NRC approval to use DRWM in the LPPT. To document qualification, a notification of compliance with the criteria and the date of the intended first application of the codes to determine the DRWM physics constants for LPPT must be sent to the Nuclear Regulatory Commission (NRC). Any voluntary limitations or restrictions on the use of the DRWM methodology must also be addressed in the notification. The NRC would then, at their option, audit the application of the DRWM program to ensure compliance.

1)

Criterion 1: Eligibility of Codes for DRWM Computations Only lattice physics codes and methods, which have received prior NRC review and approval are eligible to be used in determining the physics constants to be used in DRWM.

The NRC review ensures that the codes being used for the DRWM computations were developed under a qualified QA program and were properly benchmarked and verified.

2)

Criterion 2: Application of Procedures to DRWM Computations In a manner consistent with the procedures obtained from Westinghouse, the utility analyses shall be performed in conformance with in-house application procedures which ensure that the use of the methods is consistent with the Westinghouse approved application of the DRWM methodology.

3)

Criterion 3: Training and Qualification of Utility Personnel The first application of DRWM for LPPT will be performed by Westinghouse. This will ensure that DRWM is applicable to the specific plant, provide personnel with training in the DRWM technique and be used to meet Criterion 4 - Comparison Calculations for the DRWM Technique. The first application of DRWM for LPPT by Westinghouse will be applicable for all of the same plant type at the plant site of application. If the fuel vendor should change subsequent to the first application, a second application by Westinghouse is not required.

Serial No.04-005 Millstone Unit 3, Licensee Qualifications for Performing DRWM Analysis Page 2 A training program will be established and implemented to ensure that each qualified user of the DRWM methodology has a good working knowledge of the codes and methods used for DRWM. This training shall include the ability to set up input decks, understand and interpret output results, understand applications and limitations, and to perform analyses in compliance with the procedures provided by Westinghouse.

4)

Criterion 4: Comparison Calculations for the DRWM Technique Prior to the first application of performing analytical computations in support of DRWM for LPPT, the utility will demonstrate its ability to use the methods supplied by Westinghouse by comparing its calculated results with the analyses and results obtained by Westinghouse during the first, or subsequent, application(s) of DRWM at the utility's plant. These comparisons must be documented in a report which is part of the utility's QA records. Any significant differences between the calculations and the comparison data must be discussed in the report. As a minimum, the following parameters should be compared to the supplier of the DRWM methodology calculations, and should agree within the given acceptable deviation:

Parameter Acceptable Deviation Calculated Bank Worth

+/-2% or +/-25 pcm Calculated Total Worth of All Banks

+/-2%

Measured Bank Worth Obtained for First

+/-2% or +95 pcm Application Measured Total Worth Obtained for First

+/-2%

Application

5)

Criterion 5: Quality Assurance and Change Control All calculations for DRWM, using the Westinghouse methodology which has been approved by the NRC, shall be conducted under the control of a quality assurance program which meets the requirements of 10 CFR 50, Appendix B.

The QA program will also include the following:

a) A provision for implementing changes in the methods and procedures being used for DRWM. [Westinghouse has a requirement to inform utilities performing DRWM calculations of changes to the DRWM process.]

b) A provision for informing Westinghouse of any problems or errors discovered while using the DRWM methods or procedures.