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SIA Calculation NMP-26Q-302, Rev. 0, Nine Mile Point, Unit 2 Main Steam Line Strain Gage Data Reduction, Attachment 13.9
ML091610113
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 03/26/2009
From: Horvath R, Trubelja M
Structural Integrity Associates
To:
Office of Nuclear Reactor Regulation
References
7705420 NMP-26Q-302, Rev 0
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ENCLOSURE ATTACHMENT 13.9 SIA calculation NMP-26Q-302 (Non-proprietary version)

Nine Mile Point Unit 2 Main Steam Line Strain Gage Data Reduction Nine Mile Point Nuclear Station, LLC May 27, 2009

V Structural Integrity Associates, Inc. File No.: NMP-26Q-302 CALCULATION PACKAGE Project No.: NMP-26Q PROJECT NAME:

EPU Vibration Monitoring CONTRACT NO.:

7705420 Rev. 0 and Rev. 1 CLIENT: PLANT:

Constellation Energy Nine Mile Point Unit 2 CALCULATION TITLE:

Nine Mile Point Unit 2 Main Steam Line Strain Gage Data Reduction Affected Project Manager Preparer(s) &

Document Pages Revision Description Approval Checker(s)

Revision Signature & Date Signatures & Date 0 1-34 Original Issue Appendices Al-A21, Roland Horvath B1-B21, Miroslav Trubelja 3/26/09 C1-C21, D1-D21, 3/29/09 El-E21, Fl-F21, G1-G21, Miroslav Trubeija H1-H21,11-121, 3/26/09 J1-J21, Kl-K21, Li-L5 Document Does Not Contain Vendor Proprietary Information Page 1 of 34 F0306-OIRO

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Table of Contents

1.0 INTRODUCTION

............................................................................................................... 5 2.0 TECHNICAL APPROACH .................................................................................................... 5 2.1 Data Acquisition Parameters and Filename Convention ................................................ 5 2.2 Channels with Invalid Signals ...................................................................................... 8 2.3 Data Reduction Methodology ......................................................................................... 8 2.4 Strain Gage Data and Dynamic Pressure Estimates .................................................... 10 3.0 STRAIN GAGE INSTRUMENT LOCATIONS ................................................................... 11 4.0 VIBRATION DATA .................................................................................................................. 11 4.1 Noise floor comparison ................................................................................................ 12 5.0 SU MMA R Y ................................................................................................................................ 13 6.0 RE FER EN CE S ........................................................................................................................... 14 APPENDIX A 0% POWER ........................................................................................................ Al APPENDIX B 25% POWER ......................................................................................................... B1 APPENDIX C 45% POWER ........................................................................................................ C1 APPENDIX D 53.5% POWER (ONE FW PUMP) ...................................................................... DI APPENDIX E 53.5% POWER (TWO FW PUMP) ...................................................................... El APPENDIX F 69% POWER .......................................................................................................... Fl APPENDIX G 88% POWER ....................................................................................................... GI APPENDIX H 90% POWER ....................................................................................................... Hi APPENDIX I 94% POWER ................................................................................................................ I1 APPENDIX J 97% POWER .......................................................................................................... Ji APPENDIX K 100% POWER .................................................................................................... KI APPENDIX L WATERFALL DIAGRAMS ................................................................................ Li

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List of Tables Table 1: Strain Gage Channels and Locations .............. . .. ...................... 6 Table. 2: File N am es vs. Pow er Levels ............................ ........ - ............... ;..,,...................................... 7 Table 3: Virtual Channels ............................................................................................................ 7 Table 4: Applied N otch Filters ............................ ................................................................ ... ............ 9 Table 5: Pressure Conversion Factor ................................................ ....................... ............................. 10 Table 6:.0% Power - Strain RMS and Max-M. .............. ............. .. ...... 15 Table 7: 25% Power - Strain RMS and Max-Min ............................ ,............................................. 16 Table 8: 45% Power - Strain RMS and Max-Min m.............

.......................... ................................. 17 Table 9: 53.5% Power (One FW Pump) - Strain RMS and Max-Min . ...................... .........................

18 Table 10: 53.5%.Power (Two FW Pump) - Strain RMS and Max-Min .......................................... 19 Table 11: 69% Power - Strain RMS and Max-Mmn ...... ............................ 20 Table 12: 88 % Power - Strain RMS and Max-Min ...................................... 21 Table 13: 90% Power -,Strain RMS and Max-Min' Mm...............................................22 Table 14: 94% Power - Strain RMS and Max-Min m.........................................................

.............. 23 Table 15: 97% Power - Strain RMS and Max-Min m............

................. ......................................... 24 Table 16: 100% Power - Strain RMS and Max-Min m.............

........ ............... ........................ :..25

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List of Figures Figure 1: M SL-A-Upper RM S u-STR ....................................... ......... ; .................... 26 Figure 2: MSL-A-Lower RMS u-STR ...................... I..................26 Figure 3: MSL-B-Upper RMS u-STR ......................................... 27 Figure 4: M SL-B-Lower RM S u-STR,; ..... .............. ;............................ ;.............................. 2......7..

27 Figure 5: M SL-C-Upper RM S u-STR ...... ;................................... ......................................... 28 Figure 6: M SL-C-Lower RM S u-STR.... ................................. ....... ............

I ...................... ...... 28 Figure 7: M SL-D -Upper RM S u-STR ..................................................... ......... ............................... 29 Figure 8: M SL-D -Lower RM S u-STR .................................................................  ; ......................... 29 Figure 9: MSL A and B, RMS u-STR .......... ...................... .............................................. 30 Figure 10: MSL C and D, RMS u-STR ........................................ 30 Figure 11: Coherence plot MSL-A-Upper vs. MSL-A-Lower..'....  ;................................................. 31 Figure 12: Coherence plot MSL-B-Upper vs. MSL-B-Lower ................................................... 31 Figure 13: Coherence plot MSL-B-Upper vs. MSL-B-Lower ......................... 32 Figure 14: Coherence plot MSL-B-Upper vs. MSL-B-Lower ........ ................ 32 Figure 15: Main Steam Line A-Upper vs. B-Upper ............................ , ................ .......................... 33 Figure 16: Lab test EIC compared to NMP EIC at power level 25% and 100% ...... ,.............. 33 Figure 17: Lab test EIC compared to NMP DATA at power level 25% and 100% ...................... 34 File No.: NMP-26Q-302 Page 4 of 34 Revision: 0 Document Does Not Contain Vendor Proprietary Information F0306-O1RO

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1.0 INTRODUCTION

During the fall 2007 Nine Mile Point Unit 2 maintenance outage, strain gages were installed on the main steam piping inside the drywell to indirectly measure the dynamic pressure pulsations that' occur during plant operation. Main Steam (MS) line strain measurements were recorded during the. April 2008 power ascension. The purpose of this calculation is to determine magnitude of pressure pulsation and convert the timý history strain gage data into frequency spectra in order to characterize its frequency content. Conversion factors between strain and pressure are also provided for each data location [2].

2.0 TECHNICAL APPROACH 2.1 Data Acquisition Parameters and Filename Convention" The strain gage data [3] was recorded on Structural Integrity's VersaDASTM Version 4.4 strain gage data acquisition system with each strain gage co-nfiguration inia 2bridge. Each data set was recorded-using a sample rate.of 2500 samples per second:(sps)for 120 seconds.

Each data set contains 32 columns of data in binary format where each column represents 1 channel of 2 bridge MS strain gage data. The channel number versus MS strain gage location is summarized in Table 1. In addition, signals from the individual channels are also grouped into 8 virtual channels based on their location. The purpose of the virtual channels is to.calculate the dynamic pressure at a certain pipe location by averaging all working strain gages at that location.

Table 3 describes how the recorder channels are combined into virtual channels for each MS gage locations.

Data was obtained during the April- 2008 power ascension at 0%, 25%, 45%, 53.5%, 69%, 88%,

90%, 94%, 97% and 100% power levels. The 0% power data set represents reactor, conditions low core and no steam flow: Normal Operating Pressure and Normal Operating Temperature (NOP/NOT). Additionally, atevery power level above NOP/NOT a measurement was repeated without Wheatstone bridge excitation voltage. In this configuration the cables of the strain gages serve as antennae capturing only the electric noise normally present in the signal. The purpose of thismeasurement is toidentify the noise characteristic of the system. This technique is called Electric Interference Check (EIC). Table 2 summarizes the filenames for each dataset.

Once acquired, these signals were downloaded from the VersaDASTM data !acquisition computer by Structural Integrity Associates (SIA) for analysis. The, analysis of the data was done using MATLAB[1]. I .

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Table 1: Strain Gage Channels and Locations Channel Orientation no. MSL Elevation Gage ODent Comment

'"2 " 02A, 45 __

Upper 06A 225 3 ~315'9-7/8" *0A' "90.

4 04A .. 135 norationalStrainGageStaringat#% Power 4 08A 315 Inoperational Strain Gage Staring at 0% Power 6 10A 45' Lower 14A 225 303'2-7/16" '1A~

ý',I 9 ~ __________________

'7 IS~~~'fA 2 70' _____________________

8 12A 135 Inooerational StrainGe Starting at 0% Power 16A 315 02B 45 10 Upper 06B 225 314' 10-5/16' rf&i9O-bp-toe'raltioifiStAlG at0 o

" 12 , 04B 135 Inoperational Strain CGae Starting at 0% Power

,i .. ." 08B q - . 315 B

1B 45 14 Lowrr. 14B 225 lnoperational Strain Gage Starting at 0% Power 309'6" K~~lZ ~ 49J _______________________

12B ., 135 16 16B . 315' 01c,<' K 0  : ,~ '

18 , 02C 45 Inoperational Strain Gage Starting at 0% Power Upper 06C 225

19' 2"307' 3-5/16" 603 C;" , 90'""

6~f7C ~ 270.............

20 04C 135 lnoperational Strain Gage Starting at 0% Power 08C 315 C

22 1C 45 Lower 14C 225, f 23 ~301' 11' I .90 o .. '.

2412C 135 -

16C 315 25 . * ~ '0ý 180w K ' . ~perationat'Stramii GSmtmtig g atr0% pdwerr 02D 45 26 Upper 06D 225 309' 0D~

(b '1 '

28 04D 135 Inoperational Strain Gage Starting at 0 % Power D 08D 315 bIoperational Strain Ge Startin at 0% Power 29D 45 30 104 Lower 14D 225 31303' 7-11/16" ~ 4 9 '. m t~i1Srti~tri t0 o 32 121 135 16D 315 File No-.: NMP-26Q-302 Page 6 of 34 Revision: 0 Document Does"Not Contain Vendor Proprietairy information F0306-01RO

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Table 2: File Names vs. Power Levels.

___________Data Files _-

Power % . File Name - Date Time Comment DATA 20080416224519.dta 4/16/2008 22:45 NOPNOT EIC No EIC 25 DATA 20080417082119.dta 4/17/2008 8:21:00 AM 25__ 'EIC 20080417082921.dta 4/17/2008 ,8:29:00 AM 45 -DATA .. 20080418064142.dta 4/18/2008 . 6:41 EIC 20080418063619.dta 4/18/2008 6:36 _

DATA 20080418102812.dta 4/18/2008 10:28:00 AM 53.5__ - EIC 20080418103314.dta .... 4/18/2008 10:33:00AM One FW Pump 53.5 DATA 20080418114515.dta 4/18/2008 11:45:00 AM T wo FW Pumps EIC 20080418115050.dta 4/18/2008 11:50:00 AM 69 DATA 20080418133533.dta 4/18/2008 1:35:00 PM EIC 20080418134134.dta 4/18/2008 1:41:00 PM DATA 20080419042237.dta 4/19/2008 4:22:00 AM EIC 20080419042836.dta 4/19/2008 4:28:00 AM 90 DATA 20080419052320.dta 4/19/2008 5:23:00 AM EIC 20080419051618.dta 4/19/2008 5:16:00 AM DATA 20080419070235.dta 4/19/2008 7:02:00 AM EIC 20080419065611.dta 4/19/2008 6:56:00 AM DATA 20080419082350.dta 4/19/2008 8:23:00 AM EIC 20080419081737.dta 4/19/2008 8:17:00 AM DATA 20080419094734.dta 4/19/2008 9:47:00 EIC 20080419094134.dta 4/19/2008 9:41:00 AM AM Table 3: Virtual Channels Location Channels SMSL. Upi; 1 2 39-~

MSL-B-Upper 91011 12 MSL-B-Lower 13 14 15 16 MSL-D-Upper 25 26 27 MSL-D-Lower 29 30 31 32

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2.2 Channels with Invalid Signals Initial review of the main steam line strain gage data was performed to determine if the data was valid and to determine how to combine the strain gage data at each MS line location. Based on this review certain channels have failed and these signals were not used in any of the subsequent analyses. On channels 4 and 28, both strain gages, had bad resistance reading starting at 0%

power level. The Wheatstone bridge on these channels could not be balanced and had to be excluded from the entire data processing. A couple of strain gages failed prior the power ascension (Table 1) and their functioning condition didnot change during the entire power ascension. Table 3 summarizes the created virtual channels for the power ascension as well as the channel exclusions.

2.3 Data Reduction Methodology.

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2.4 Strain Gage Data and Dynamic Pressure Estimates The strain gages to Pressure Conversion Factors (PCF) were determined using formulas for a thick wall cylinder acted upon by internal pressure only Reference [2]. Table 5 summarizes the pressure conversion factors for each main steam line location.

Table 5: Pressure Conversion Factor Mean Conversion CNn MSL Elevation Factor for each location (psi/me) 1 2 Upper 3.82 3 315' 9-7/8" 4

A 5

6 Lower 7 303' 2-7/16" 8

9 10 Upper 3.84 11 314' 10-5/16" 12 B

13 14 Lower 15 309' 6" 16 17 18 Upper 3.85 19 307' 3-5/16" 20 C

21 22 Lower 23 301'11" 24 25 26 Upper 3.92 27 309' 28 D 29 30 Lower 3.94 31 303' 7-11/16" 32 1 1 File No.: NMP-26Q-302 Page 10 of 34 Revision: 0 Document Does Not Contain Vendor Proprietary Information F0306-O1RO

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3.0 STRAIN GAGE INSTRUMENT LOCATIONS Eight sets of strain gages were installed at eight elevations on the main steam piping inside the drywell with 2 locations per line. The opposite strain gages are connected in a 1/2 bridge in order to reduce the effect of the bending modes. These eight groups of strain. gages were combined into eight virtual channels. Table 3.shows the detailed description of these 8 virtual channels.

In order to increase the quality of the signal an External Power Source (EPS) was used to provide more robust voltage excitation to the Wheatstone bridges. The application of the EPS made the EIC measurement relatively easy. That is the reason why all the data sets above NOP/NOT level are coupled with an EIC data set.

At 100% power level a coherence check was done to verify the improved signal quality. For every main steam line, the upper and the lower virtual channels were coupled to check the coherence level. These plots are shown in Figure 11 thought Figure 14. The upper and lower virtual channels are mechanically coupled. The excitation induced by the acoustic pressure pulsation, in the common space, results that the coherence is reaching higher values in lower frequency domain. Figure 15 shows the coherence plot of two virtual channels where the source (acoustic pressure pulsation) and the mechanical path have highly indirect relationship and coupling. The coherence check, between MSL-A-Upper and MSL-B-Upper, results in generally low coherence.

It is important to notice that on the coherence plots there are a couple of peaks reaching near 1 value. These peaks are the result of electrical interference of 60Hz and its upper harmonics (common excitation of changing external magnetic and electrostatic filed). Also we can observe high coherence at 149Hz. At this frequency the coherence is high because all the strain gages have a response due to the uniform mechanical vane pass excitation.

4.0 VIBRATION DATA Appendices A through K contain the frequency spectra for the strain gage vibration data collected during the April 2008 power ascension. Vibration data for all ten (10) power levels were recorded and the corresponding frequency spectra were generated using MATLAB [1].

Appendix A - 0% Power Appendix B - 25% Power Appendix C - 45% Power Appendix D - 53.5% Power Appendix E - 53.5% Power Appendix F - 69% Power Appendix G - 88% Power Appendix H - 90% Power Appendix I - 94% Power Appendix J - 97% Power Appendix K - 100% Power

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Table 8 through Table 16 contain summaries of the strain RMS and Max-Min values (gE) and corresponding pressure values (psi) for each power level.

Figure 1 through Figure 10 show the RMS micro strain values as a function of power level for each MS lines and elevations. In addition, waterfall plots are provided in Appendix L of the frequency spectra versus power level for each of the combined main steam line strain gage data sets.

4.1 Noise floor comparison Additional tests were performed in order to compare the NMP noise floor to the laboratory noise floor test. The NMP noise floor was captured generating EICs at different power levels. These EIC noise floors combine the noise originated from the signal path such as cabling and penetration plus the noise of the data acquisition hardware itself.

The laboratory noise floor was generated using 300ft cables with two real strain gages with identical data acquisition hardware. For the lab test the two strain gages connected in similar fashion to a half bridge like the strain gages on the NMP main steam lines.

The EICs recorded at 25% and 100% power level and the EIC generated in laboratory environment are nearly identical showing that the NMP has excellent installation of strain gage data acquisition system. However, when laboratory generated noise floor is compared to that of real data at 25% and 100% of power, it is apparent that the lab noise floor is lower at all frequencies and it never obscures any strain signals. Therefore, it is safe to filter any electrical and mechanical interference frequencies present in the EIC recordings out of the actual strain data. The results of these comparisons can be seen on Figure 16 and Figure 17.

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5.0

SUMMARY

Main steam strain gage data was collected following the April 2008 Nine Mile Point Unit 2 maintenance outage. Initially the gages were connected in /2 Wheatstone bridge with two strain gages at the opposite side of the main steam pipe. When one of the strain gages failed it was replaced by a completion resistor and the 1/2 bridge was configure to a 1/4'bridge.

The data was collected at ten (10) power levels during the power ascension. At every power level above NOP/NOT an extra set of data was recorded without bridge excitation in order to identify the characteristic of the electric noise in the signal. During the data acquisition an analog filter was used to prevent signal aliasing. When the data was post processed different types of digital filter were applied to remove undesired frequency content originated from 60Hz AC electrical network and the Reactor Recirculation System pumps.

Observations:

1) In general the maximum time history RMS micro-strain of the virtual channels is less than 0.17.

The highest RMS micro-strain of 0.16274 is measured on MSL-C-Upper at 100% power level.

2) In the frequency spectra the dominant frequencies are lower than 50Hz.
3) 60Hz electrical noise and its upper harmonics in the signal were expected based on industrial experience. The presence of this electrical noise and the correct application of notch filters, to remove these frequencies, were verified by the Electrical Interference Check at different power level.
4) Coherence check at 100% has satisfying results.
5) In general the noise floor is between 1 and 2 nano-strain.

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6.0 REFERENCES

1. MATLAB, Version 7.1.0.246, Release 14, Service Pack 3, Mathworks, August 02, 2005.
2. Structural Integrity Associates Calculation, "Nine Mile Point Unit 2 Strain Gage Uncertainty Evaluation and Pressure Conversion Factors", Revision 0, SI File No. NMP-26Q-301.
3. Nine Mile Point.Unit 2 April 2008 Strain Gage Data, SI File NMP-26Q-209.

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All content in Appendices A through L are proprietary and are excluded from this version of the document.

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