ML052490196
| ML052490196 | |
| Person / Time | |
|---|---|
| Site: | Palisades, Quad Cities  |
| Issue date: | 07/14/2005 |
| From: | Fujikawa K Structural Integrity Associates |
| To: | Stachniak R Exelon Nuclear, Office of Nuclear Reactor Regulation |
| References | |
| KJO-05-004 SIR-05-219, Rev 0 | |
| Download: ML052490196 (17) | |
Text
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ENCLOSURE 2 Structural Integrity Associates Letter KJO-05-004, "Vibration Comparison of Quad Cities Units 1 and 2 Power Ascension Accelerometer Spectra Data,"
dated July 14, 2005
Structural Integrity Associates, Inc.
6855 S. Havana Street Suite 350 Centennial, CO 80112-3868 Phone:
303-792-0077 Fax:
303-792-2158 www.structint.com kohara@structintcom July 14, 2005 SIR-05-219 Rev. 0 KJO-05-004 Mr. Rob Stachniak Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
Subject:
Vibration Comparison of Quad Cities Units I and 2 Power Ascension Accelerometer Spectra Data
Dear Rob,
The intent of this review is to compare the amplitude and frequency of ERV-3B and ERV-3C accelerometer vibration data between Quad Cities Unit I (QCI) and Quad Cities Unit 2 (QC2).
Data comparisons were made at common, higher power levels where frequency content is representative of full power operation. Additionally, frequency content will be compared to known acoustic frequencies present within the main steam (MS) piping systems.
INTRODUCTION QCl and QC2 completed their maintenance outages and subsequent power ascensions in May and June 2005, respectively. During their 2005 outages, accelerometers were installed and/or reconnected and during each power ascension accelerometers were monitored at two ERV locations (ERV-3B and ERV-3C). Only ERV-3B and ERV-3C were common to both QC1 and QC2 (QCI had accelerometers on ERV-3B and ERV-3C only, whereas, QC2 had accelerometers on all ERVs).
Data monitoring consisted of recording accelerometer time histories at several power levels during power ascension. These accelerometer time histories were then converted to acceleration frequency spectra by Exelon.
This review provides a detailed assessment of both the amplitude and frequency content of these accelerometer spectra.
Austin, TX Charlotte, NC N. Stonington, CT San Jose, CA 512-533-9191 704-597-5554 860-599-6050 408-978-8200 Silver Spring, MD Sunrise, FL 301445-8200 954-572-2902 Uniontown, OH Whittier, CA 330-899-9753 562-944-8210
Mr. Rob Stachniak July 14, 2005 Page 2 SIR-05-219 Rev. 0/KJO-05-004 INSTRUMENT TYPES AND LOCATIONS The accelerometer spectra comparisons were limited to two locations; QCI had accelerometers at two locations (ERV-3B and ERV-3C), whereas, QC2 had accelerometers at all ERVs, including ERV-3B and ERV-3C. This limited the frequency spectra comparisons to the two valve locations only.
QCI - Power Ascension, June 2005 The vibration levels of two ERVs (ERV-3B and ERV-3C) were monitored during the June 2005 power ascension. These locations wvere selected because they had the highest amplitudes observed during the December 2003 power ascension. Six accelerometers were mounted on each valve inlet in the x, y, and z axes (two tri-axial mounts on either side of the valve inlet flange, Table I and Figures I through 3).
QC I accelerometers were in approximately the same locations as the QC2 accelerometers.
Vibration data was captured and processed by Exelon personnel and Structural Integrity Associates received frequency spectra for each of 10 power levels [1]. Spectra data was captured from 0-2887 MWth (87.3 - 910.7 MWe) [8], but only power levels greater than 85% power level (Table 3) were used in this comparison. Amplitude and frequency content for these spectra plots are more representative of full power operation.
OC2 - Power Ascension, April 2005 The vibration levels of four ERVs (ERV-3B, ERV-3C, ERV-3D, and ERV-3E) were monitored during the April 2005 power ascension. All locations had three accelerometers mounted on each valve inlet in the x, y, and z axes (one tri-axial mount on the valve inlet flange, Table 2 and Figures 1 and 2). QCI accelerometers were in approximately the same locations as the QC2 accelerometers. Due to the fact, that QC1 had accelerometers at only two ERV locations, then the QC2 comparison was also limited to these two locations (even though more accelerometer data was available).
Vibration data was captured and processed by Exelon personnel and Structural Integrity Associates received frequency spectra for each of 17 power levels [2]. Spectra data was captured from 0-2887 MWth (119.7 - 930.4 MWe) [8], but only power levels greater than 85% power level (Table 3) were used in the comparison (as explained above).
AMPLITUDE AND FREQUENCY COMPARISONS The spectra plots for QCI and QC2 at 2887 MWth are shown in Figures 4 through 15. Spectra plots were compared for each individual axis for ERV-3B and ERV-3C on both units (QCI and QC2).
Discrete frequency RMS amplitudes are shown in Table 4, whereas, overall composite amplitudes are shown in Table 5. The detailed assessments are provided below.
ER V-3B Spectra Assessment Figures 4 through 9 show the acceleration spectra plots for ERV-3B for 2887 MWth. Inspection of each plot (x, y, and z axes), for Units I and 2, shows only two "significant" discrete frequencies that were common to both units; 139-140.5 Hz and 157 Hz (Table 4). These frequencies are very similar to the Quad Cities data taken during the last power ascensions (QCI in December 2003 [3] and QC2 in April 2004 [4]) and are indicative of an acoustic phenomenon within the MS lines near the valves.
MSructural Integrity Associates, Inc.
Mr. Rob Stachniak July 14, 2005 Page 3 SIR-05-219 Rev. 0/KJO-05-004 QC2 did show some frequency content betveen 140 and 160 Hz. These frequencies were sharp and had comparable amplitudes. Frequencies were observed at 151.5 and 160.5 Hz. These frequencies are believed to be associated with the modifications to the steam dryer, since they were not observed during the 2003/2004 power ascension spectra plots. No other "significant" frequency content was observed in these spectra plots.
The maximum QCI composite amplitude was 0.48 grins for ERV-3B y-axis; whereas, the maximum QC2 composite amplitude was 0.54 grms for ERV-3B z-axis. The maximum discrete frequency amplitudes are shown in Table 4. These amplitudes do not exceed 0.25 grms and 0.44 grms at any discrete frequency for QCI and QC2, respectively. Amplitudes at other frequencies (other than the discrete frequencies) were less than 0.02 grns (basically noise floor responses). Amplitudes below 0.1 grms are considered low, whereas, amplitudes between 0.1 and 0.5 grins are considered low-to-moderate. These amplitudes are not high enough to cause excessive wear.
ER VI-3C Spectra Assessment Figures 10 through 15 show the frequency spectra for ERV-3C for 2887 MWth. In general, inspection of each plot for each axes (x, y, and z), for Units I and 2, showed only two "significant" discrete frequencies that were common to both units; -139 Hz and -157 Hz (Table 4). These frequencies are similar to the Quad Cities data taken during the last power ascensions (QCI in December 2003 [3] and QC2 in April 2004 [4]) and are indicative of an acoustic phenomenon within the MS lines near the valves. QC2 did show some low frequency content between 140 and 160 Hz; at 151.5 and 160.5 Hz. These frequencies were sharp and had comparable amplitudes. These frequencies are believed to be associated with the modifications to the steam dryer, since they were not observed during the 2003/2004 power ascension. Additionally, QCI ERV-3C showed two discrete frequencies at 21 and 36 Hz. These frequencies were only observed on the x-axis. These frequencies are low and may be associated with a structural response of the valve. No other "significant" frequency content was observed in the spectra plots. Amplitudes at other frequencies were less than 0.02 grins (basically noise floor responses).
The maximum QCI composite amplitude was 0.32 grins for ERV-3B y-axis; whereas, the maximum QC2 composite amplitude was 0.78 grins for ERV-3B z-axis (Table 5). The maximum discrete frequency amplitudes are shown in Table 4. These amplitudes do not exceed 0.066 and 0.358 grms at any discrete frequency for QCI and QC2, respectively. Amplitudes at other frequencies (other than the discrete frequencies) were less than 0.02 grins (basically noise floor responses).
Amplitudes below 0.1 grins are considered low, whereas, amplitudes betwveen 0.1 and 0.5 grms are considered low-to-moderate. These amplitudes usually are not high enough to cause excessive wear.
The maximum composite amplitude of 0.78 grms is concentrated at 139 and 157 Hz frequencies and based upon Wyle Labs testing [7], no valve responses were observed in this frequency range.
RESULTS AND CONCLUSIONS A review of the acceleration frequency spectra for the most recent QCI and QC2 power ascensions (June 2005 and May 2005, respectively), resulted in the following observations between QCI and QC2 MS piping and their associated valve dynamic response:
&SfrctvralIntegrity9Associates, Inc.
Mr. Rob Stachniak July 14, 2005 Page 4 SIR-05-219 Rev. O/KJO-05-004
- 1)
Frequency content between QCI and QC2 are similar.
- a. A comparison of the frequency spectra between QCI and QC2 showed similar frequency responses in the 0-200 Hz frequency range. In general, the frequency spectra were comparable and had similar frequency content (Figures 4 through 15).
Additionally, data from the previous QCI and QC2 power ascensions [3, 4] appeared to be dynamically similar with respect to frequency content.
- b. In the 139-160 Hz frequency range for both QC1 and QC2, there are slight differences in the frequency of the spectral peaks. These frequency differences were 5 Hz and most likely attributed to the steam dryer modifications, since they were not present in the previous power ascensions. Per References 5 and 6, most valve components have natural frequencies below this frequency range and would not respond.
- c. QC1 ERV-3C x-axis had two discrete frequencies (21 and 36 Hz) that were not observed on QC2 ERV-3C x-axis. Again these frequency differences were minor in that they occurred only on one vibration axis and based on frequency seemed to be unique to the valve.
- 2)
The acceleration amplitudes (RMS) are similar in magnitude for both units, based on the maximum composite amplitudes (Table 5). The maximum composite amplitudes observed were 0.54 and 0.78 grins for QC1 and QC2, respectively. In general, both units had most of this energy concentrated at 139 and 157 Hz.
Based on this acceleration data and the resultant spectra plots, the dynamic behavior of QCI and QC2 MS piping, and the responses of ERV-3B and ERV-3C valves are similar, both in amplitude and frequency content. Thus, the structural responses of the MS lines are similar between QCI and QC2.
If you have any questions, please do not hesitate to contact me at (303) 792-0077.
Prepared By:
Reviewed By:
K. J. O'Hara Karen K. Fujikawa, P.E.
Senior Consulting Engineer Associate Approved By:
Karen K. Fujikawa, P.E.
Associate
$3: Structural Integrity Associates, Inc.
Mr. Rob Stachniak July 14, 2005 Page 5 SIR-05-219 Rev. 0/KJO-05-004
REFERENCES:
- 1. Frequency spectra received from Exelon via ibackup.com, SI File No. QC-28Q-203.
- 2. Frequency spectra received from Exelon via ibackup.com, SI File No. QC-28Q-201.
- 3. Structural Integrity Associates Calculation No. QC-1 I Q-302, Revision 0, "Quad Cities Unit I Main Steam Line Vibration Data Reduction," SI File No. QC-1 IQ-302.
- 4. Structural Integrity Associates Calculation No. QC-16Q-303, Revision 0, "Quad Cities Unit 2 ERV Vibration Data Reduction," SI File No. QC-16Q-302.
- 5. Structural Integrity Associates Report No. SIR-05-198, Revision 0, "Assessment of Quad Cities Unit 1 Power Ascension Main Steam Line Vibration Frequency Spectra," SI File No. QC-28Q-402.
- 6. Structural Integrity Associates Report No. SIR-05-192, Revision 0, "Assessment of Quad Cities Unit 2 Power Ascension Main Steam Line Vibration Frequency Spectra," SI File No. QC-28Q-401.
- 7. Wyle Test Report No. 50584-01, dated 2/23/04, "Test Report - Vibration Endurance Test Program for a Dresser Electromatic Relief Valve Type 6" 1525-VX for Exelon Nuclear," SI File No. QC-16Q-202.
- 8. Exelon Transmittal of Design Information (TODI) No. QDC-05-03 1, Revision 0, "Quad Cities Startup Testing Test Conditions," SI File No. QC-28Q-204.
cc:
Guy Deboo (Exelon)
Roman Gesior (Exelon)
Kevin Ramsden (Exelon)
Roy Hunnicutt (Exelon)
K. Rach (SI)
K. J. O'Hara (SI)
QC-28Q-403 t
Structural Integrity Associates, Inc.
Mr. Rob Stachniak Page 6 July 14, 2005 SIR-05-219 Rev. O/KJO-05-004 Table 1: QCI Accelerometer Types and Location Number Type Direction Location 1, 4 Accelerometer Parallel to Inlet Flange ERV 3B fow (X)
IltFag R
1 2, 5 Accelerometer Vertical (Y)
Inlet Flange ERV 3B 3, 6 Acclerometer Perpendicular to Inlet Flange ERV 3B 6 Acelromter MS flo (Z) 7, 10 Aelerometer Parallel to MS Inlet Flange ERV 3C 10 Aceleroeterw (X) 8, 11 Accelerometer Vertical (Y)
Inlet Flange ERV 3C 9, 12 Acclerometer Perpendicular to Inlet Flange ERV 3C Table 2: QC2 Accelerometer Types and Location Channel Type Direction Location 7
Accelerometer Parallel to MS Inlet Flange ERV 3B flaow (Y)
Accelerometer Vertical (Y)
Aclrmtr Perpendicular to Inlet Flange ERV 3B Acceeromter MS flowv (Z) 13 Accelerometer Parallel to MS Inlet Flange ERV 3C flow (X) 14 Accelerometer Vertical (Y)
Inlet Flange ERV 3C 15 Accelerometer Perpendicular to Inlet Flange ERV 3C M S flow (Z )
Table ]3: QCI and QC2 Accelerometer Data - Power Levels of Comparison Quad Cities Power Levels 1
Unit 1 181 Unit 2 181 MWth (MWc)
MWth (MWe) 2887 (930) TC41 2887 (911) TC15a 2831 (912) TC39 2854 (901) TC14 2800 (900) TC38 2765 (871) TC12 2754 (882) TC37 2642 (829) TCI 1 2573 (821) TC34 2508 (788) TC1O 2493 (792) TC33 Structural Integrity Associates, Inc.
Mr. Rob Stachniak Page 7 July 14, 2005 SIR-05-219 Rev. 0/KJO-05-004 Table 4: QCI and QC2 Discrete Frequency and Amplitude Comparison Accelerometer QC-I QC-2 QC-1 QC-2 Location Axis Frequency Amplitude Frequency lAmplitude Frequency l Amplitude Frequency l Amplitude (liz)
(grms)
(liz)
(grms)
(liz) l (grms)
(liz)
I (grms)
ERN7-3B Inlet X
140.5 0.043 Bad Channel 157 0.092 Bad Channel Flanle Y
140.5 0.116 139 0.049 157 0.189 160.5 0.130 Flange Z
140.5 0036 139 0.170 157 0.149 151.5 0.202 ERV-3C Inlet X
139.5 0.042 139
[
0.125 157 0.066 160 0.045 nge Y
139.5 0.023 Bad Channel 157 0.011 Bad Channel Flange Z
139.5 0.057 140 l
0.358 158 0.065 150.2 l
0.256 Table 5: QCI and QC2 Composite Amplitude Corn arison Accelerometer Comrosite AmPlitude Lcation Axis QCI QC2 L
(grms)
(grins)
ERI-13Inet X
0.19J ERF-3B Inlet Y
0.48 0.330 Flange Z
0.41 0.540 et X
0.21 l
0.310 Fla3 nlet IY 0.32 Flage0.25 0.780 Structural integriyAssociates, Inc.
Mr. Rob Stachniak Page 8 July 14, 2005 SIR-05-219 Rcv. 0/KJO-05-004 Date: SW1M2O3 Tine: 10:43:31 AM
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Mr. Rob Stacliniak July 14, 2005 Page 9 SIR-05-219 Rev. 0/KJO-05-004 Date: 5/1O003 s IA swpvv%
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Mr. Rob Stachniak Page 10 July 14, 2005 SIR-05-219 Rev. 0/KJO-05-004 B ERV Direction Label Cable Accl S/N X
BX TODO6 Pir I 10537 Y
BY TOD06 Pair 2 10533 Z
BZ TODI3 Pair I 10445 Alt X BAX TOD13 Pur2 10532 AlY DAY TOD12 ParI 105r AkZ IAZ TOD12P r2 10564 C E-RV Direction Label Cable Are S/N X
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CZ TODIS Pair I 10557 Ah X CAX TODOS Par I 10550 Al Y CAY TOWOSPrir2 10156_
AltZ CAZ TODI6PairI 10562 X = Parallel To Flow Y = Vertical Z = Perpendicular To Flow x.
x Ahtnata lonm Figure 3: QCI ERV Accelerometer Location/Orientation - Tri-Axial Accelerometer Blocks Structural Integrity Assoclates, Inc.
Mr. Rob Stachniak Page 1 1 July 14, 2005 SIR-05-219 Rev. 0/KJO-05-004 Quad Cities U1
%- 6/5/05 14:50 PM -%
912 MWe Filtered Spectral Plot "B" ERV - X Direction Max Sec: 153 Second Composite grms = 0.18568 1
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Mr. Rob Stachniak July 14, 2005 Page 12 SIR-05-219 Rev. O/KJO-05-004 Quad Cities U1
%- 6/5/05 14:50 PM -%
912 MWe Filtered Spectral Plot "B" ERV - Y Direction Max Sec: 153 Second Composite grms = 0.47877 0.25 ----------------
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Quad Cities U2 5/22/05 3:10 AM MWe 930 MWth 2885 Filtered Spectral Plot Ch. 8 - 3B ERV Inlet Flange Vertical (Y)
Max Sec: 57 Second Composite grmns = 0.32886 I
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Mr. Rob Stachniak July 14, 2005 Page 13 SIR-05-219 Rev. 0/KJO-05-004 Quad Cities U1
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912 MWe Filtered Spectral Plot "B" ERV - Z Direction Max Sec: 134 Second Composite gmms = 0.40928 0.2 0.15 0) 0)
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Quad Cities U2 5/22/05 3:10 AM MWe 930 MWth 2885 Ch. 9 - 3B ERV Inlet Flange Perpendicular to MS Flow (Z)
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Mr. Rob Stachniak Page 15 July 14, 2005 SIR-05-219 Rev. O/KJO-05-004 Quad Cities U1
%- 6/5/05 14:50 PM -%
912 MWe "C" ERV - Y Direction Max Sec: 49 Second Composite grms = 0.31935 Filtered Spectral Plot 0.04 0.035
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Mr. Rob Stachniak Page 16 July 14, 2005 SIR-05+219 Rev. 0/KJO-05-004 Quad Cities Ul 6/5/05 14:50 PM -%
912 MWe Filtered!Spectral Plot "C" ERV - Alt Z Direction Max Sec: 139 Second Composite grms = 0.25037 0.09 0.08 0.07 -------
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Quad Cities U2 5/22/05 3:10 AM MWe 930 MWth 2885 Ch. 15 - 3C ERV Inlet Flange Perpendicular to MS Flow (Z)
Max Sec: 29 Second Composite grms = 0.78893 0.5 L 0.45 0.4-L -
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