ML20091B444
| ML20091B444 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 03/25/1992 |
| From: | Kinuchi S, Stred F CENTERIOR ENERGY |
| To: | |
| Shared Package | |
| ML20091B433 | List: |
| References | |
| NUDOCS 9204010028 | |
| Download: ML20091B444 (83) | |
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{{#Wiki_filter:-- - _ _ - - _ _ _ - _ - _ - _ _ - _ _ O i SEISHIC EVENT EVALUATION REPORT TOR Tile MARCII 15, 1992 Me - 3.5 EARTIl0UAYE PERRY NUCLEAR Pl>Mr DOCKET NOS. 50-440; 50-441 O TIIE CLEVELAND ELECTRIC ILLUMINATING COMPANY MARCII 1992 3 1 ,y Approved By: fuf;7 - . ij m (4r Director,PNEd L , s Approved lly ..jlI_'h'/$9, :--T General' Manager /'PNPPD Approved Ily: AD w 1 u.d Director, PNSD 9204010028 920325 PDR ADOCK 05000440 5 PDR 1
TABLE OF COtfIU RS 1.0 INTROWCTION AND CONCLUSIONS 3 2.0 SEISMIC EVf24T OVERVILM 3.0 EARTHQUAKE ANALYSIS _ 4.0 SEISMIC INSTRUMQUATION AND RECORD RETRIr1.:.L 5.0 SEISMIC EVALUATION OF RECORDED EVDir 6.0 APPENDICES b A. KINEMETRICS STRONG ICTION DATA B. ENGDAHL STRONG MOTION DATA C. ANALYSIS OF PDAS-100 RECORDINGS AND CAV CALCULATIONS O ,
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! TABLE OF CCNTENTS-1.0 IlfrRODUCTION AND CONCLUSIONS 2.0 CEISMIC EVENT OVERVIEW 3.0 EARTHQUAKE ANALYSIS 4.0 SEISMIC INSTRUMD4TATION AND RECORD RETRIEVAL 5.0 SEISMIC EVALUATION OF RECORDED EVD1T 6.0 . APPENDICES
. A. KINEMETRICS STRONG MOTION DATA 1 B. ENGDAHL STRONG MOTION DATA C. ANALYSIS OF PDAS-100 RECORDINGS AND CAV CALCULATIONS O
1.0' INTRODUCTION AND CONCLUSIONS , The purpose and scope of this report is to provide the results of The Cleveland Electric' Illuminating (CEI) Company's seismic event-evaluation of the March 15, 1992 earthquake pursuant to Petty Nuclear Plant Technical Specification 4.3.7.2.2. This evaluation report addresses the key issues related to the March 15 earthquake including the immediate response to the event, the plant status and impact assessments follow.4ng the earthquake, evaluations of the seismological ~ aspects of this event, and an analysis of the plant seismic design basis capabilities compared to recorded plant data. The discussions contained herein provide the basis for CEI's conclusions that the March 15,-1992 Mc - 3.5 earthquake in the vicinity of-the Perry site in Lake Erie:
- 1) did not-adversely effect the plant structures, systems or components,
-2) was within the Operating Basis Earthquake (CBE) of the Perry Nuclear Plant,
- 3) does not change the licensing basis or conclusions regarding the site geology, seismology or design basis earthquake, and
- 4) -is further evidence that the Electric Power Research Institute (EPRI) recommendations on OBE exceedance should be implemented.
O- 1-1 ,
h 2.0 SEISMIC EVENT OVERVIEW 3 2.1 CVENT An earthquake, with an approxine'.e magnitude of 3.5 Me, was recorded by the CEI seismic monitoring network (stations located in Lake and Geauga Counties) on Sunday, March 15, 1992 around 01:14 EST. The epicenter of the earthquake was located in Lake Erie about four (4) miles northwest of the Perry Nuclear Plant located in Perry, Lake County, Ohio. Figure 2.1 shows the epicentral location of this event. This event was followed by eight (8) af tershocks which were all substantially smaller than the main shock. From newspaper and police report accounts, the ] event was felt by the local population, mainly in the towns along the lake shore from Painesville to Geneva, Ohio. This earthquake was recorded by the seismic monitoring systems operated by CEI (Autostar) and John Carroll University. Plant staff began analyzing the Autostar records within one hour of the event and provided preliminary ' g information to control room operators and local officials. The data was also evaluated by Weston Geophysical Corporation and these results are provided in Section 3.0 and Appendix C of this report. 2.2 PLANT RESPONSE , At the time of the event, the plant was operating at 99% power. This local earthquake (magnitude M = 3.5) was felt by Plant Operations personnel at the Plant and was recorded by in-plant strong motion seismic instruments. The Plant seismic instruments provided information which indicated that motions experienced by the Plant were sign!ficantly below the design or safe shutdown earthquake (SSE) and well below the operating basis earthquake (OBE). The SSE zero period acceleration (ZPA) is .15g and the OBE ZPA is .0759. 2-1 0
Control Room indications provided immediate information that the earthquake had occurred and that the recorded motion was below 2/3 of the OBE at the containment foundation. See Section 4.0 of this report. At 01:43 EST the Plant declared an Unusual Event idE), the lowest emergency a d on level, and Operations personnel immediately commenced a Plant walkdown to investigate for any Flant damage which could be earthquake related, and found none. The Plant remained at 99% power. Additionally, Plant technical support personnel were called into the Plant for further evaluations of the event. These personnel were needed to gather information from a seismic monitoring network located in the Lake /Geauga counties and to recommend further Plant actions. Also, PNPP Instrumentation and Control (I&C) technicians were called into the plant for strong motion earthquake records retrieval. The seismic monitoring network provided data on size and location of the earthquake, which was provided to the Control Room personnel. Seismic specialists examined this field data and again reviewed the in-plant monitors, and consulted with Operations on results of Plant walkdowns which included the reactor containment building. At approximately 04:40 EST the Unusual Event was declared over as there were no safety concerns identified and all indications wete that the OBE had not been exceeded. 2.3 EARTHQUAKE ANALYSIS This is the first event since the 1/31/86 Leroy Earthquake (magnitude Mb = 5.0) that was felt and recorded at the Plant. This was a non-damaging small event, several times smaller than that of 1/31/86 event and below the OBE design of the Plant. The occurrence of the 3/15/92 earthquake and its aftershocks is typical of the periodic low level seismicity of the region and does net alter the conclusions of local and regional seismicity previously docketed by CEI in the following references: 2-2 l l
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- Perry USAR, Section 2.5, Revision 4, March 1992.
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- 18th Quarterly Seismic Monitoring Report (PY-CEI/NRR-0144L, dated 2/27/92),
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- SSER No.9 Confirmatory Activities Close Out: Geological and .l Geophysical Studies (PY-CEI/NRR-0486L. dated 6/24/86). . ;
2.4 SEISMIC DESIGN EVALUATION Results of the immediate inspections on 3/15/92 indicated that the peak ground acceleration at the Auxiliary Building foundation on Engdahl Peak Recorders was .038g and subsequent analysis of Kinemetrics time history data indicated a rimilar peak acceleration of .038g at the Containment Building foundation. 1 () Acceleration data taken from the in-plant seismic recorders shoved recorded floor response spectra were within the OBE design spectra. Similar to the 1986 earthquake response, the instrumentation located at elevation 686' of containment recorded the highest accelerations. This is an expected result as motions input to the foundatien mat will be amplified as they are transmitted up through the structure. Design floor response spectra consider this amplification when they are developed for above grade elevations. - CEI' analysis shows the high frequency accelerations involved are of a very short duration and the velocities and displacements are vell below those which could cause damage even to non-engineered structures. The total energy associated with these high frequency accelerations is small, and therefore has no adverse impact on plant structures and equipment. The the high frequency accelerations have-no engineering significanco and the effects of the earthquake experienced at Perry are well within the seismic capability of the plant. This latest event is O 2-3
,. , I - ..
further evidence that the proposals provided by the Electric Power Research Institute (EPRI) on OBE exceedance should be implemented, and the application of Cumulative Absolute Velocity (CAV) would allow faster and more accurate plant assessments of potential damage. See Section 5.0 and Appendix C of this Report.
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i 3.0 EARTHCUAKE, ANALYSIS 3.1 Introduction In addition to the strong motion instrumentation installed at different locations inside the Perry Nuclear Plant, CEI still operates a small aperture telemetered seismic monitoring network, named AlJIOSTAR. This AUIomated Seismic Telemetering and Recording system has five 3-component stations and a 1-component analog station near Geneva, all of which are telemetered to a central receiving / processing station at the Plant, At the time of the ehrthquake, CEI was also testing a PDAS-100 instrument at the Antioch station of the Autostar network. In addition, John Carroll University (JCU) operates c small regional network centered around the epleenter of the January 31, 1980 earthquake. This section provides a preliminary summary review and analysis of all the data collected by the CEI and JCU stations. Appendix C provides a review of the PDAS-100 data and calculates a Cumulative Absolute Velocity (CAV) measurenant for this event. 3.2 Hypocentral Determination on March 15,1992, at 6h 13m 56.8s UT, a small earthquake with a coda magnitude of 3.5, occurred offshore the town of Painesville, Ohio. The epicenter was located in Lake Erie approximately at 41.9N and 81.3W, about seven kilometers northwest of the Perry Nuclear Plant. Because of the short epicenter distance, some of the strong motion instrumentation at the Plant were triggered by the arrival of the shear and surface waves. The hypocentral solution was calculated using all arrival times from the stations of both CEI and JCU networks. Table 3.1 presents the details of the hypocentral solution obtained with the "Hypoellipse" locationing computer program. O 3-1
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Because the event is outside the aperture of the two networks aad far enough in Lake Erie, the fe:al deptn estimate carries a large uncertainty. Other arrival ti:nes at more distant stations, e.g. from the Lamont-Doherty observatory, the Canadian National Network and from the University of Western Ontario were obtained, but not used since they clearly containinate the excellent data provided by the two local networks. Figure 2.1 shows the epicentral location cf the event. The sensitivity of the location is illustrated by showing the difference obtained when only the CEI data are used and when the JCU data are added. JCU has stations west of the epicenter, while the CEI stations _ are all located to the east. Figure 3.1 shows the earthquake as recorded by the CEI Autostar system. Figure 3.2 provides a 20 second trace of the ehrthquake along with selected P and S wave arrival times. Figure 3.3 shows a " zoom" earthquake trace for the Antioch station which is located about 1 mile east of PNPP. The small earthquake was felt in towns along the lake shore, mainly from ?ainesville to Geneva, Ohio. Although no formal intensity survey was conducted, the most common description as learned from police stations and local media reports corresponds to intensity (MM) III and IV levels, typical for events with similar magnitude. The event was clearly felt at the plant for a brief duration, From the recordings collected, one can assume that the perception of the tremor must not ' have lasted more than a few seconds. Se/eral af tershocks were detected by the two networks, at least eight over the next 60 hours. Table 3.2 pressats the details of the entire sequence. The slight differences in epicentral location b6 tween the main shock and the aftershocks are not considered to be significant, and most probably reflect the bias introdaced by processing weaker events with different station configurations and reading accuracies. It should be notea that previously on June 27, 1988, a similar sequence consisting of a microearthquake with a magnitude Mc 2.7 and five small 3-2 h ,
aftershocks ranging from ~0.1 to 1.7 was detected and placed in the very same location, i.e. 41.81 and 81.229W. These events were documented in Quarterly Seismic Monitoring Report No. 7 (Ref. PY-CEI/NRR-0905L, dated 8/26/88). 3.3 FAULT PLANE SOLUTION An attempt was made to obtain a fault plane solution. Unfortunately, all the CEI stations and most of the JCU stations are grouped in the ~. same azimuthal quadrant. Additional data provided by other network operators are clearly inconsistent, thus suggesting that first arrivals are not truly read. This is to be expected beyond 100 km. Because of this a fault plane solution could not be obtained. 3.4 DISCUSSION The small earthquake was not strong enough to cause any damage, but it h was clearly felt by those awake at this early time of the night, within several tens of kilometers, particularly along tne lakeshore where soil amplification is common. The instrumental data set is good enough to - support a reliable epicenter, and possibly an indication that the depth was shallov. Occasional occurrences of magnitude 3 to 3.5 events are in agreement with the historical record of the region. Previous Y studies have established that the Northeastern Ohio seismicity is relatively low compared to other regions of the Northeast. The examination of available accelerograms suggests that the largest peak ground acceleration observed at Antioch was associated with a very short duration wave, one or two cycles, at about 11 Hz. This seismic motion is well below any damage threshold. The CAV values obtained are , low and consistent with several other observed magnitude 3 to 4 events with MM intensity III. See Appendix C. O 3-3
Hypocentral Solution 03/15/92 Earthquake TABLE 3.1 23-MAR-92 12:27100 for the program !LLIPSE e7674 0FFSHOKE DAINSVILLE. DH. PAINSHOCK Input t al e n ame. . . . : MAR 1592A.!NP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + . . . . , . . . . . . . . . . . .
CEUSTAL MODIL 1 LAYEE WELOCITY CIP1H TMICANE;5 VP/V5 AM/5EC %M KM 1 4 250 0.000 2.000 1.79 2 6.500 2.000 33 000 1.75 3 8.100 35.000 1000.300 1.78 4ESULTS OF ( AC M ITECATICN1 7 1 LA1 LONG OLPTH 045 OLAT OLONO O! 1 05.0 15.0 2.00 0.69 6.74 -1.01 -0.th 2 48.6 14.3 1.92 0.17 1.20 -0.99 1.55 3 49.3 13.6 3.37 0.10 -0.93 -0.06 -1.68 s 4 48 8 13.6 1.68 0.09 - 0. 20 -0.70 0.00 5 48.7 13.1 1.68 0.06 1.07 0. 68 1.67 5 49.3 13.6 3.35 0.09 -1.07 -0.68 -1 67
- 6 46.7 13.1 1.68 0.06 1.06 0.68 1.66 5 49.3 13.6 3.34 0.09 -1.06 -0.68 -1.66 6 48.7 13.1 1.68 0.06 0. 52 0.36 0.95 0 7 49.0 13.3 2.63 3.06 -0.24 -0.21 -0.23 8 48.8 13.2 2.35 0.05 -0.00 3.01 -0.14 8 48.8 13.2 2.21 0.35 0.0R -0.01 0.14 9 48.3 13.2 2.35 0.05 0.00 0. 00 0.00 9 46.8 13.2 2.35 0.05 0.00 0.00 0.00 us********* NYPOE LLIP SE LOCATION R E SUL T S * * * * * * * * * *
- N ORI20N T AL( 20 0F) VIPTICAL Si
- 3.26 SE = 0.29 55 = 4.70 OUALITY . C A2* 64 A2 . -*6.
0 ATE 04: GIN LAT L O NG ?!'T d MAG NO G1P 295 $2H ik ! iC0 920315 613 56.60 41N49.34 31 d l 3.19 2.3 3.5 16 235 0.05 0.2 4.7 C 0 41.3139 61.2199 (---S T A TI O N CATA---)(-----P WAVE DATA------)(-----S WA/E DATA------)(MAC OATA) STA 0111 A2M ADP P 3EC PAME PRES PWT SSEC SR9F 5tES SWT FMP FMAG Ahi 7.9 102 93 53.38 I Pc 0 -0.0 2 1 22 59.5655 ) -0.00 0.92 SCH 9. 7 139 92 58.11 IPC0 0.03 1.22 60.14E5 3 -0.01 0.92 all 14.3 172 92 59.45 IPC0 0.06 1.22 61.34E5 ) -0.08 0.91 FCR0 14.6 132 92 59.51 IPC0 0.06 1.22 61.49E5 3 -0.03 0.92 G2R 19.4 170 91 60.20 IPC1 0.00 0.92 220 3. 5 GEN 19.4 79 il 60.00 I PC 4 -0.17 0.00 THQ 19.7 133 91 60.32 :PC1 0.06 0.92 RAD 20.5 161 91 0.41 :PC0 0.03 1.22 3.15ES 1 -0.02 0.69 MEN 21.0 227 91 60.32 IP01 -0.10 0.92 210 3.4 CHE 30.5 203 91 61.86 IP 1 -0.04 0.92 CTM4 31.5 163 91 62.14 IP 1 0.03 0.92 CLs 44.5 21 6 90 64 06 !)C1 0.01 0.12 210 3. 4 BEAV 121.1 35 90 79.00 !P 4 ?.15 0.00 26C 3. 6 QU ALITY B A SED ON FOCAL $PNER2: A S
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TABLE 3.2 MARCH 15, 1992 MAIN 5HCCK AND A553CIATE D 4F TERSHOCK PARAMETERS YE ARMO DY HRMISEC ' LATITUDE LONGITUDE DEPTH NP GAP RMS ERH ERI Mc Trigger *
- 1. *19920315 61356.30 41H48.84 31 W 13.19 2. 3 16 235 .05 .2 4.7 3. 5 7674
- 2. 19 92J 315 623 6.63 41N48.61 81W12.94 2.1 10 236 . 03 .3 13.7 1.8 7675
- 3. 19920315 950 9.92 41N48.81 81W13.00 2.3 10 239 .38 .3 19.4 0.5 7677
- 4. 19920315 11 9 7.60 41N48.73 81W12.56 2. 2 8 237 .04 .2 5.8 0.2 7678
- 5. 19920315 144939.81 41H48.67 31W12.65 2.2 10 235 .C4 .3 9.3 2.2 7679
- 6. 19920316 22936.30 41N48.65 81W12.9/ 2.1 10 296 .03 .2 9.7 1.1 7680
- 7. 19920316 458 0.56 41N48.73 81W12.21 2.2 9 295 .03 .3 10.9 0.2 7691 B. 19920316 122414.98 41N48.61 21W12.44' 1.9 10 234 .04 .3 .2 1.6 7682
- 9. 19920316 141519. No Trigger on Digital Network -0.3 Vp1=4. 2 5 k m/ s Thicknas s = 2 km Vp2=6.5 km/s Thicknas s = 33 MAR. 1992 vp/Vs=1.78
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___ . _ .. _ ____.________._.___y_..._________ O 4.0 seismic 2"sTauKerr^T10" x"o accoaos arrartvst 4.1 INSTRUMENTATIO!4 _ Thrac different types of in-plant seismic strong motion monitoring instrumentation were used to record the March 15, 1992 Mc 3.5 earthquake located near PNFP in Lake Erie. Table !.1 and figure 4.1 delineate the specific instrument number, type and location. PNPP is a fully instrumented Regulatory Guide 1.12 facility. One type of instrument used is the Kinemetrics Model SMA-3 strong motion triaxial time-history accelerograph. This system detects and . records three mutual perpendicular components of acceleration over the , entire duration (recording starts within 200ms of measuring .0059) of ! the carthquake onto cassette magnetic tape. Power to the unit is supplied by_ internal rechargeable batteries which are kept in a charged state by 120 VAC line power. Two instruments of this type were used, one was located on the Reactor Building roundation Mat at an elevation of approximately 575 feet, and the second on_the containment shell at ' elevation 686 feet. The second type of instrumentation used is the Engdahl PSR 1200-H/V response spec'. rum recorder. This total mechanical system records three I mutually perpendicular components of acceleration, at selected frequencies. The instrunnt has twelve reeds fabricated of varying lengths, one for each frequency ranging from approximately 2 Hz to 25 Ha, and a diamond-tipped stylus at the free end of each reed to ' inscribe a permanent record on one of-twelve record plates. Tour instruments of this type-are provided, two on the Auxiliary Building Foundation Mat, one_at the Reactor Building roundation Mat, and one in
'the Reactor Building located on the Dioshield Wall.
The third type of instrwnent is the Engdahl PAR 400 peak accelerograph.
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This totally mechanical system records three nutually perpendicular components of peak local acceleration (i.e., the zero period acceleration). A diamond tipped scriber at the end of an amplifier arm records a permanent mark on a record plate. Again, this system is totally self-contained and requires no outside power source. Three instruments of this type are used and are located on the Auxiliary Building roundation Mat, on a Reactor Recirculation Pump, and a third instrument on High Pressure Core Spray (!!PCS) piping in the Reactor Building. 4.2 Ptida INSPECTIONS TCLLCHING E'vCE Prior to the earthquake that occurred on March 15, 1992, numerous testing, calibration and work completion activities were being conducted in preparation fec the Third Refueling outage. The plant had just completed a power reduction to 994 at Systems operating Center (SOC) request. On March 15, 1992 0 0116 the Control Room received a Seisnde Trouble Alarm, heard a large thud and felt the building shake. The plant supervision entered off Nornal Instruction toNI) D51. In cupport of the ongoing testing and surveillance activities, a ; significant number of systems were in operation. In addition, numerous other systems wet ( energized and in the standby mode. All of the operating safety-related and non-safety systems centinued to operate through the event. None of the systems in the standby modo experienced any spurious initiations. In addition to the emergency plan action previously discussed, immediately following the event plant operators performed a plant walkdown. Areas of visual inspection include the Diesels Rooms, l l 4-2
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Control Complex 620', Auxiliary Boilers, Intermediate, Auxiliary. Fuel llandling, Turbine lleater Bay Buildings and the accessible areas of the Reactor Building. The plant outer structures including the Cooling Tover, Circulating Vater Pump llouse. Emergency Service and Service d Vater Buildings were inspected. The reports to the Control Room indicated that the areas were found in satisfactory condition with no damage. An existing crack in the vest staltvay to the lleaterbay Building was noted as possibly disturbed, and was the only noted observation during the valkdown.
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4.3 RECORDS RETRIEVAL As part of CEI's response to the earthquake, the data collected from active and passive seismic recorders has been evaluated. The tapes from the Kinemetrics Strong Motion Acceleration system were sent to the: vendor for further data reduction and analysis. See Appendix A of this report. Record plates vere removed from the Engdahl Strong Motion monitors for the Auv.iliary and Beactor Buildings and the liigh Pressure Core Spray Pump base. The records were analyzed and data interpreted by the System engineer, see Appendix B of this report. One set of Engdahl records (vertical component) from the D51-R190 instrument located on the Auxiliary Building foundation vere discovered damaged upon inspection and vill be forvarded to the vendor for further analysis. Peak accelerations recorded from instruments vore as follovst Instrument Location Acceleration
.D51-N101 R.B. Foundation 0.038g ZPA (uncorrected)
D31-N111 . Containment Vessel 0.03g 0 12 Hz (2% damped) D51-R120 Reactor Recire Pump to be examined D51-R130 HPCS Piping.. to be examined D51-R140 A.B. Foundation. HPCS Room 0.038g ZPA D51-R160 R.B. Foundation 0.0625g @ 25.6 Hz (2%-damped) D51-R170 Bioshield Vall to be examined O\/ D51-R180 A.B. Foundation. HPCS Room out-of-service 051-R190 A.B. Foundation, PCIC Room to be examined 4-3
l Immediately following the event, preliminary indications were provided to the control room operators that this earthquake was act safety significant because: h
- 1. Engdahl Panel lil3-P969 indicated there were no recorded accelerations above the OBP. or above 2/3 OBC at the 12 frequencies monitored at the containment foundation.
- 2. Kinemetrics Panel ll51-P021 " seismic switch" indicated that the OBE had not been exceeded at the containment foundation.
- 3. There were no plant damage reports suggesting equipment may malfunction.
- 4. There were no unusual plant system reactions to the earthquake.
- 5. The location and magnitude of the event provided by the off-site monitoring network indicated the event was non-damaging.
In the early morning hours of 3/15/92, records were examined from instruments D51-N101, D51-R140 and D51-R190 to determine further the significance of the event, and to determine the need for additional records examination. Based on those initial three instrument readings, it was decided to continue records retrieval on a phased schedule with the refueling outage (RTO3) which commenced 3/20/92. Off Normal Instruction (ONI) D51 requires removal and analysis of earthquake records following an event of this nature which is felt by PNPP personnel and triggers (.005 9 ) on the Kinemetrics recording unit. Technical Specificatien 4.3.7.2.2 requires submittal of a Special Report to the Nuclear Regulatory Commission if any of the above instruments record accelerations greater than .05g. 4-4
~ _
r i ._ O O PERRY NUCLEAR POWER PLANT UNIT NO.1 SEISMIC MONITORING INSTRUMENTATION TABLE 4.1 I lastrument Type Manufa(turer / Model Number t o(ation 3/1S/92 Status Reactor Budd.ng Foundation Mat g D51 -N 101 (1) Kmemetrics/ 5M A-3 Elewation 575 -10, Azimuth 175* Rea(tor Building Containment Vessel gp era e D 51 -N 111 (1) Kanemet r Ks / $M A- 3 Elevation 686"-O-Azimuth 174* J l Rea(tor Reartulation Pump l (inside Drywell, Reactor Bu+1 ding ) , DS1-R120 (2) t ogdahi / PA R-400 Elewa: ion 605 --O* ( Aporosem.2tety ) Armuth 145' Reactor Building D51 - R 130 (2) Engdahl! PAR 400 HPCS Piping Operable Elevation 631'-1" Aunitiary Budding Foundation Ma: , D51- R 140 (2) E ngdahl / PAR-400 JPC f'3DI C ( HPC5 Pump Roun ) Elewation 5fs-4~ L l 1 T.eania! Time-Hrstor y Auelerograph 2 Trtanea! Peak Auelerograph 3 Tridnedl Response Spettrutn Recorder
Page 2 of 2 PERRY NUCLEAR POWER PLANT UNIT NO.1 SEISMIC MONITORING INSTRUMENTATION TABLE 4.1
?nstrument yp nu a(turer / Model Number Location Number 3/1S/92 Status I
Pea < tor Bus! ding Fo atron at , D51-H 160 (3) Engdahl / PSR-1200 HI V-12A ,
. g er ,e Azirnuth 225*
Reactor Building D51 R170 (3) Engdahl / P5R- 1200-H / V Operable ll Elevation 636'-6" Azimuth 238' Aumiliary Buildeng D51 -R 180 Engdahl / P5R-1200-H / V Foundation Mat (3) ( HPCS Pump Room ) Out-of-ServMe Elevation 568*-4~ Auxiliary Building D51-R 190 (3) Engdahl / P5R-1200 H / V F undation Mat ( RCIC Pump Room) Operable Elevation 568~-4~ 1 Treanial Tame-History Auelerograph 2 Trianial Peak Auelerograph 3 inasial Response Spe(trum Recorder O O O
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- 3. Instrument #D51-R120 7. Instrument #D51-Ri80
- 4. Instrument #D51-R140 8. Instrument #D51-R190 FIGURE 4.1 - PERR1r POWER PI).NT INSTRUMENT LOCATIONS. PLAN VIEW O O O 4
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- 2. #D51-N111 R/B Containment Vessel. El. 686', 6. #D51-R170 R/B Platform. E1. 630'. t.z. 238*
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- 4. #D51-R140 A/B Foundation Mat. E1. 568' I
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FIGURE 4 l - PERRY POWER Pl. ANT INSTRUMUIT LOCATIONS. ELEVATION VIEW 1
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5.0 - SEISMIC EVAWATION OF RECORDED EVDTP
-Seismic Desion Background
.The seismic design basis for the Perry Nuclear Power Plant is established by requirements in 10CTR Part 100, Appendix A and tiRC Regulatory Guide 1.60. These regulations require nuclear plant structures and safety class systems and components to be designed to withstand loads induced by a " Safe Shutdown Earthquake" (SSE) for the particular site. The SSE is the strongest earthquake in terms of magnitude of vibratory i round motion that is expected to occur at a particular site._ The SSE is the design basis earthquake considered for plam licensing. A second seismic event also considered in designing nuclear plants is the " Operating Basis Earthquake" (OBE). The OBE is the strongest earthquake considered'likely to occur at a particular site during a plant lifetime, and is at least one-half of the SSE.
_ Operations may resume following an earthquake which exceeds the OBE- _O ter ee> # t< time '8 t "o <="ctio" t e ee 8 occ#<<ee te safety-retated plant featutes.
~~
(10CTR Part 100, Appendix A, III(c), V(a)). The Perry SSE design response spectra were derived by using the standard response spectra of Reg. Guide 1.60 scaled to a zero period
' acceleration (ZPA) of 0.15g determined for the Ferry site. .These spectra served as the design response spectra at ate foundation elevations for use in designing the plant buildings. The corresponding OBE! design response spectra are scaled to'a ZPA of 0.0759 .
For more details concerning Perry's design response spectra, including significant inherent.conservatisms within its development, refer to ; Section 6.0 of Reference 1 or USAR Chapter 3. O 5-1 y
5.2 overviev of March 15, 1992 Earthquake The March 15, 1992 event was determined to be of ar. approximate 3.5 Mc magnitude, with an epicenteral location about four (4) miles northwest of the operating Perry Nuclear Flant. This event is of substantially lover magnitude and total energy than the earthquake for which the Ferry Plant was designed. Comparison of recorded time-hir.tcry accelerations (Figure A-1 of Appendix A) at the foundation mat (el. 574'-10") of the Reactor Building (RB) with the corresponding OBE time-history acceleration used for design has reveeled the minor nature of this event with respect to its overall dutation, time of strong motion and energy content. In fact, as stated in Section 4.0 of Appendix A, the recorded data at this location was of such lov magnitude that response spectrum analysis could not be performed by the vendo due to a lov signal to noise ratio. The overall minor nature of the event, as recorded by the Kinemetrics SHA-3 instrument at the R/B foundation, is further collaborated by the following seismic data:
- Engdahl PSR-1200 readings (at the same general R/B location) indicate very lov acceleration values. See Table B 4 of Appendix B.
- Engdahl PAR-400 readings (at Auxiliary Building (AB) foundation, El. 568'-4") indicate a ZPA horizontal acceleration of 0.038g. See Table B-5 of Appendix 3. This compares favorably to the SHA-3 data of the R/B foundation, which also is approximately 0.038g (uncorrected) horizontal acceleration. See Figure A-1 of Appendix A for the latter data.
- Horizontal PSR-1200 readings (at A/B foundation, el. 568'-4")
indicate a very lov response spectra values. See Table B 7 of 5-2
O (e1. 524'-10 > Areeedix e. he veitice1 ,eeeinee ut111 ed es the recordings (scratches) for this instrument are pocr and appear to represent manmade disturbances, and are thus discounted. 5.3 Evaluation of Specific Recorded Data To further evaluate the nature of this event, detailed response spectrum analyses were performed for the Kinemet ics S W 3 data recorded at Elevation 68f' on the Containmant Vessel. This data is presented in Appendix A and the pertinent tripattite plots are repeated in rigures 5.1 through 4.3 (vert ical, north-south and east-west, respectively) for convenience. Similar to the January 31, 1986 Leroy earthquake (Reference 1), this event is alto characterized by high frequency content, with maximum recorded accelerations occurring above 10 tiz. For purposes of comparison against the p1 ant's design basis, the 21 O ae eea one ee ie= eectr> " ve deem eveerime see cm t"eee trinettite plots in rigures 5.4 through 5.6, As can be seen by comparison to the 2% recorded data, the OBE spectra have not been exceeded in any case. In the low frequency range (less than 10 Hz), there is substantial margin between the two. Again, similar to the 1986 event, it is not surprising that less margin is seen between the plots in the hi".'i frequency range (above 10 Hz). For very similar rearons as discussed in Section 6.3 of Reference 1, these high frequency responses have negligib1e engineering significance due to associated low velocitier and displacements. Subsequent work by CPRI (References 2 and 3) has also further demonstrated the relative engineering insignificance of sma.1 high frequency earthquakes in general. 5.4 conclusions The March 15, 1992 earthquake was a very low magnitude event which did not exceed the design basis of the Perry Plant. Similar to the January O 5-3
31, 1986 Leroy earthquake, the event was characterized by low energy, high frequency, short duration and small displacement. No further engineering evaluations for this event are considered necessary. 5.5 References
- 1. PY-CEIA!ER-0437L dated February 12,1986, " Seismic Event Evaluation Report".
- 2. EPRI NP-5030 Final Report dated July, 1988. "A Criterion for Determining Exceedance of the Operating Basis Earthquake".
- 3. EPRI NP-6695 Final Report dated December, 1989, " Guidelines for Plant Response to an Earthquake".
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b APPENDIX A TO SEISMIC EVENT EVALUATION , FOR TII E i MARCil 15, 1992 Mc = 3,5 E A R T110 U A K E , i PERRY NUCLEAR PLANT (- KINEMETRICS STRONG-MOTION DATA i 1. L. I O 1
W k .T.. , O h 9 MCompuSeis '~~ p, ML 3.5 EARTilQUAKE ,. MARCil 15,1999 ' '
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as mas : STRONG MOTION DATA FROM Tile s PERRY NUCl. EAR POWER PLANT I N. a b) :j . SE!SMIC INSTRUMENTATION ? !),
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O STRO!1G MOTIO!! DATA REFORT for the M.,. 3 . 5 EART. 'KE of 0614 GMT, MARCH 15, 1992 at
- 41. 9" !; orth, Bl . 3' Wes t near PERRY, OHIO RECORDED 011 THE PERRY liUCLEAR POWER PLA!!T STRO!JG MOTIOli ACCELEROGRAPHS for Cleveland Electric Illuminating Company Requisition !1o. C901454 by Kinemetrics/ Systems 222 Vista Avenue Pasadena, CA 91107 Sales Order C-K2082 March 18, 1992 0
- . . . . ~ . . TABLE OF CONTENTS
1.0 INTRODUCTION
. . . . . . . . . . . . . . . . . . . . . . 3 ,
2.0 INSTRUMENTATTON . . . . . . . . . . . . . . . . . . . . 3 2.1 Model SKA-3 Accelerograph . . . . . . . . . . . . . 3 2.2 Calibration Data . . . . . . . . . . . . . . . . . 3 3.0 DATA PROCESSING . . , . . . . . . . . . . . . . . . . . 4 3.1- Digitization . . . . . . . . . . . . . . . . . . . 4 4 3.2 Conversion and Data Reduction . . . . . . . . . . . 4 3.3 VOL1 Processing . . . . . . . . . . , , . . . . . . 4 3.4 VOL2 Processing . . . . . . . . . . . . . . . . . . 5 3.5- VOL3 Processing . . . . . . . . . . . . . . . . . . 5 4.0 OBSERVATIOND . . . . . . . . . . . . . . . . . . . . . . 5 DAT4 PLOTS Uncorrected Acceleration: Triaxial response at Reactor Building Foundation. Elev 575' and Containment Vessel, Elev 686' Corrected Accoleration, and Integrated Velocity and Displace-ment: Triaxial response at Containment Vessel, Elev 666' Tripartite Presentation of PSV, PSA and SD: Triaxial response at Containment Vessel, Elev 686' APPENDICES
" Conditioning and Correction of= Strong Motion Data on Analog Magnetic Tapes" E8 SMA-3-Data Sheet
1,0 IliTRODUCTION Cn March 15, 1992, a (M 3.5) local earthquake was recorded by the strong motion instruirentation at Perry liuclear Power Plant, Ferry, Ohio. The FM analog tragnetic tape cassette records from two Vinemetrics Model OtA-3 acceleregraphs were retrieved frem the instruments and provided to Minemetrics for analyr1F. This report describes the processing of these strong motion records and presents the results. Inclucied are the uncorrected accelerograms, corrected acceleration, velocity and displacement time series for the containment vessel (elevation 686') and response spectra for the containment vessel annulus. Data correction was not performed and response spectra plots were not made for the reactor building f oundation mat locaticn sinc the recorded earthquake signals are very smsll; repreaenting a signal to noise ratio of lesc than 1. 2.O I11STRUMENTATION 2.1 Modol SHA-3 Accolorograph The SMA-3 is a multi-channel, centralized recording, FM analog magnetic tape accelerograph system designed to detect and record strong local earthquakes and record the three orthogonal h acceleration signals on cassette tape.
. standby mode until its vertical trigger detects an earthquake.
The S!G- 3 remains in a The trigger then actuates recording in less than 0.10 seconds.
'I n e force balance accelerometers in the SMA-3 have a nominal natural frequency of 50 H: and damping of 65i critical, providing flat (-3dB) response from DC to 50 Hr. The ncminal sensitivit.- 0:
each of the three channels in 2.5 volts /g with a full scale response of 1.0 g. The dynamic range of the accelerograph is nominally 40 dB. giving it a resolution of ar pronmat ely 0. Olg . The trigger in the SMA-3 has a flat (-3dB) respense f rom 1 to 10 Hz and a nominal trigger level of 0.01g. For Perry !;ucl e a r Power Plant the threshold is lowered to 0.005g. Power is supplied to the SMA-3 by internal rechargeable batterles. These batteries aru kept in a charged state by 120 Vac line power. 2.2 Calibration Data The two accelerometers connected to the Model SMA-3 accelerograph system which recorded the event were calibrated for sensitivity by Perry !JPP pers annel . !!atural f requency and damping characteri? tics for the senscrs were derived fr m most recent calibration data 3va11ahle tc Kinemetrics. Sensor sha ract er15 t 1 Cs pr ?Y; 6-d L. CEI 3nd US-d *.a cC11^ct 'he dat3 are given in Table 1 belc /.
i Table 1. Most recent accelerometer calibration data O Sens., 20_ t . Freq., Damping Nr. No. Channel v / et H~ t Crer1 165-1 long 2.46 50.8 0.65 ( D 51 -!!111 ) tran 2 . 4 P. 51.4 0.62 vert 2.53 51.8 0.63 165-2 long 2.47 53.6 0.t. (D51-N101) tran 2.49 51.1 0.63 vert 2.46 52.4 0.65 3.0 DATA PROCESSING Data from the Model SMA-3 accelerographs were played back using a Kinemetrics Model SMP-1 Playback System through a Data Compensator, digitized using a Kinemetrics Model SSR-1 Solid State Recorder and
. processed as described in Kinemetrics' Application Note No. 7,
' Conditioning and Correction of Strong Motion Data on Analog Magnetic Tapes" (appended to this report) with exceptions as noted in section
1.0 INTRODUCTION
of this document. 3.1 Digitization The magretic tapes were digitized using the SSR-1 Solid State Recorder. The 1024*Hert: FM time reference recorded on channel 4 of the cassette is output from the SMP-1 and di ided down by four (256 H: + deviation) and used as the timing signal for the digital conversion time interval. The multiplexed uncorrected time series are written into the SSR-1 digitizer's solid state memory for retention until retrieval with an IBM-PC or 1001 compatible ccmputer. 3.2 Conversion and Data Reduction The binary file (s) retrieved from the SSR-1 recorder are converted to Kinemetrics' ccmmon data format for analysis. The time series data is edited to constrain the file to seismic ir*.ormation only. 3.3 VOL1 Processing The digitized data were demultiplexed and scaled to acceleration units using specific sensor characteristics for damping and sensitivity. Calibration data from Table 1 is incorporated into the header information of the file for referoce during VOL2 analysis. The mean was then subtracted f rom each acceleration time history. The new time histories were then written in a Kinemetrics' VOL1-format disk file. The three uncorrected acceleretion time histuries trem each 5:'A-3
/3 record were then plotted; these plots are included in the data
\.) section of this report.
3.4 VOL2 Processing The reccrded accelerograma were then i ns t ruiren t and baceline corrected using Einemetrics' VOL: picgram. This program is based upon the VOL: program deve'oped n LCtech (Tratunac and Lee, 1973). No mnjor modi!ications to the original VOL: al; tori thms have been mad?. The data were bandpass filtered using Ormaby filters. The icw-pass filter had a cut-of f f requency of 3 3 He and a termination fIequency of 3 5 b' . The high-pass filter had a cutoff frequency of 1.5 H: and a termination frequency of 1. 3 H r ..
<ut of this program cunsicts of a plot of corrected releration, velocity and displacement for each ccmponent of recorded data. Plots for the containment vessel are presented in the data section of this report. The small signal levels recorded for the reactor building f oundation mat did not permit this type of analysis.
3.5 VOL3 Processing Linear response spes ta were calculated from the corrected acceleration time histories using the algorithms developed by Trifunac and Lee. Response spectra were calculated for damping ratios of 0, 2, 5, 10, and 20 percent. The traditional tripartite log-log plots of pseudo-velocity vs. period were produced and are included in the data section of this report 4.0 OBSERVATIONS The resolution of t- h e SMA-3 system is appoximately 0.0lg. The earthquake data recorded at the containment veucel (elevation 686 ') were very small but, were of aufficient signal to noise ratio for response spect rum calculation. The arthquake data recorded at the reactor building foundation mat .te t e not of sufficient signal to noise ratio to permit this analysis Because of the low levels of motion asJociated with this event, the accelerograph system triggered on the arrival of the S-wave, not the P-wave. As such the uitial earthquake motion was not recorded. The start-up time f or the 3Mt.-3 accelerograph si st er is 0.1 ::econds and is usually character 1:ed by a large apike(s) at the beginning of the reccrded event. Mcn-neumic data ( 1. sithin the O 4
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D51-N101 UNCORRECTED ACCELERATION TIME HISTORIES FIGURE A.1
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o MARCH 15. 1992 OHIO EARTHOURKE o H%M
.~ 1 o.cs PERRY NFP. SMA-3 S/N 165-2 COMP 2 -T- E0112E.V2 BANDPRSS FILTER LIMITS: 1.300-1.500 33.00-35.00 g PEAK VALUES: ACC= 24.54 VEL = .35 DISP = - . 01 11J O i m 20.00- ACCELERAII0tt
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N\MNhk MARCH 15, 1992 GHIO EARTHOURKE ' PERRY NPP. SMR-3 Sn1 165-? COMP 3 -V- E0112E.V2 BANDPASS FILTER LIMITS: 1.300-1.500 33.00-35.00 l PEAK VALUES: ACC= -18.06 VEL = .23 DISP = .01 g o ACCELERATION 4 x 10.00 -
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/
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_ ..= . A:? PLICATION NOC:3 Conditioning and Correction of Strong Motion Data on Analog Magnetic Tapes No. 7 Kinemetrics has developed programs for routine computer processing of data recorded on the analog magnetic tape accelero-graphs, Models SMA-2 and SMA-3. The software from published rcsearch for film recording accelerographs (Trifunac & Lee, 1973) has been adapted to the analog magnetic tape recording instruments. Magnetic tape is used where rapid playback and analysis of data are require 6. These accelerographs are normally located at & W large engineered facilities, such as nuclear power plants. i Figure 1, "Kinemetrics Earthquake Data Reduction System Flov l Diagram," illustrates the specialized servicec needed to prepare l dats immediately after an earthquake. The purpose of this Note is to describe the standard data conditioning and correction used 20 prepare accelerograms for
- - subsequent response spectrum or time-series analysis. On Figure 1 are references to the following paragraphs: 1.0--Data Playback, l
2.0--Analog-co-Digital Conversion, 3.0--Data Conditioning, and
- l. 4.0--Data Correction.
There art two " tape speed" errors in all FM analog re-cording / playback systems. One " error" is a change in apparent amp 1.itude due to unwanted tape speed changes. Correction of this error is called " amplitude compensation". This is shown in Fig-ure 2 and described in Sections 1.0 and 3.0. The second " error" is a r:hange in apparent length of the earthquake due to different l tape speeds during record 3ng and playback. Correction of this I error is called " time base compensation". This is shown in Fig-ure 3 and described in Section 2.0. 1.0 Data Playback 1.1 The playback system is a Model SMP-1 (Figure 4) . If the SMP-1 is used to play out the SMA-2 or SMA-3 tapes, the signals which appear on the integral chart recorder are amplitude h compensated. KINEMETRICS / SYSTEMS,222 VISTA AVENUE; PASADEN A, CA 91107 (818) 7952220; TELEX 67 5402 KMETRICS PSD
l. t3 V 1.2 The electrical outputs taken from the DEMODULATED OUTPUT jacks (Channels 1, 2, or 3 of Figure 4) are not amplitude compensated. However, Kinemetrica has an electronic Data Com-pensator which plugs into an SMP-1. When the Data Compensator is used, the output signals are amplitude compensated by electronic subtraction of Channel 4 from Channels 1, 2, and 3. The electronic subtraction is accomplished by means of a unity-gain operational amplifier for each of the three data channels. The data channel (1, 2 or 3) drives one input to the op-amp and the time compensation channel (4) drives the other op-amp input. The op-amp output is the difference between the two inputs and provides the amplitude compensation (as shown in Figure.2) .. The Data Compensator should be used if the signals are to be recorded on a three-channel strip-chart recorder for display. The signals are not time base compensated. 1.3 If the signals are to be processed on a computer, there are two options: , 1.3.1 Use the Data Compensator for amplitude compensation and digitize channels 1, 2 and 3.
'O
'/ 1.3.2 Without a Data Compensator, digitize channels 1, 2, 3 and 4, and have software perform amplitude cumpensation by subtracting channel 4 from each of the three data channels.
2.0 Analog-to-Digital Conversion The following steps 'are taken at Kinemetrics using the SMP-1 connected to the Analog-to-Digital Converter, Model DDS-1105 or DataSeis". 2.1 Three (3) analog outputs of the SMP-1 with Data Compensator are digitized simultaneously: longitudinal, transverse, and vertical (Channels 1, 2, 3 of Figure 4). A 12-bit analog-to-digital converter is used with normal full scale of 5 volts. 2.2 The FM Time reference output (Channel 5 of Figure 4) is 1,024 H: plus or minus tape speed error. This signal is divided down by four (256 Hz i deviation) and used as the timing signal for the digital conversion tima interval (see Figure 3). Thus, the.accelerogram time base is corrected for tape speed error and the voltage values are equally spaced at 1/256 second. This is
" time base compensation" and.can be done og analog-to-digital converters other than DDS-1105 or Dataseis l
c _ - _ -_-- - _ - _ _ --- _ - - _ _ _ _ _ _ _ - _ _ _
. c __ _ _ . - . . . _ - _
?
(Earthquake is Recorded 3
-Data Playback File at Plant Using SMP-1 at plant, -
produce strip chart records. l charts SMP-1 clearly hard copy, strip labeled gransmat Data
. Cassettes transmitted to Kinen.strics in Pasadena-Data Playback Raw Data
'Using SMP-1 at Kinemetrics, 1. Cassettes connected to A-to-D converter e 2. SMP-1 hard copy produce parallel strip charts Analoo to Digital Conversion
~
At Rimtries, using DDS-1105 or DataseisR 1.'3 channels per cassettet acceleration in x,y,and : j Data conditionino uncorrected Data Using ccomputer Uncorrected accelerogra'as o
- 1. Denn21tiplexing 9. track computer compatib1
- 2. Linear baseline correction tape and plot of time seri
- 3. Engineering units I -
Corrected Data O* Data correction Corrected accelerograns and Using computer integrated velocity and
- 1. Instrument correction - displacement 2.-saseline, correction 1. Plots of all time series
- 3. Integrated velocity 2. 9-track computer compatible and displacement tape of acceleration.
- 3. Card decks optional Data Reduction Reduced Data Using computer 1. Picts of Response spectra
- 1. Damped. Response spectra 2. Plots of Fourser spectra
- 2. Fourier Amplitude. spectra tranamit cata to owner
- 1. Raw Data
- 2. Uncorrected Data
- 3. Corrected Data
- 4. Reduced Data Data Analysis t-i FIGURE 1 Flow' Diagram for Kinemetrics E.D.R.S.
ei (Earthquake Data Reduction Sequence)
- UM MlJM
. . . l Channel 1~ f n ( ,y ..
.)
M 4 y / u (see Figure 4) f Uncompensated Earthquake Record d ; 1 J L Channe1 4 $*p)J l M % 4J,-y V,*t $ $.i:p p'gr Ih J Ei'>.=i= H >r+ i (see Figure 4) l l l 1024 Hz Time Coropensation Channel A A Il Channel 4 VyV - -- ; [\ < . A e-W *- = s - subtracted from j Channel 1 Final Record Following Amplitude Compensation FIGURE 2 Amplitude Compensation
Nt) A FSAl rrml ^$yyrr > voy4lfh% Q* %W-q1 T - 10 sec Acceleration A(t) r :::::: loecc. x lo24cgaes/sec = 10240 c3au A'ai - V a i I SMP-1 E. . . w l Apparent
> 4 , (4% . . -- ;
Acceleration A (t) T losec t AT+
=- IO240ay.iec ~-
+
- AT= firne base
... ener E Q,_.1 O nni
'/2ss see sompte. role.
- I D';S .05 FIGURE 3 Time Base Compensation 9 9 9
em 2.3 The final uncorrected accelerograms are written on 9-trach computer-compatible tape. The three channels are multiplexed (i . e . , 1, 2, 3 , 1, 2, 3,1, 2,...), and are in a 16-bit, offset binary format. 3.0 Data Conditioning Figure 5 illustrates the flow of the " Data Conditioning" software. Tape speed variations during recording and during playback of FM analog tape change the apparent time base and affect the analog amplitude. The time base has been compensated in the previous section (see Figure 3) by using the FM time reference output as the timing signal for the analog-to-digital converter. The amplitude has been compensated (see Figure 2) using the Data Compensator module. The output accelerograms are uncorrected in the sense that no modifications have been introduced which involve any hypothesis of the ground motion character or of the instrument involved. 4.0 Data Correction Figure 6 illustrates the flow of the " Data Correction" software. The purpose is to present corrected acceleration and f') integrated velocity and displacement time-histories in as accurate a form and over as wide a frequency range as is compatible with the original data. The corrected data are believed to be the most accurate form of input data feasible to produce from the original records. They are suitable input for structural response calculations and for response spectrum calculations. A high-frequency instruma.t correction is introduced to compensate for the accelerometers' frequency response. The Caltech publication EERL 71-05 discusses the approach used. The low f requency baseline correction uses an Ormsby high-pass filte' . The technique is expir.ined in Caltech publication EERL 70-07. Figure 7 contains a sample output plot of corrected data for one component of the Santa barbara earthquake of 13 August 1978, recorded on a SMA-2 acetlerograph. o l
I l l l O INPM: Multiplexed amplitude-compensated ( zwpm, 3 accelerograms, channels 1,2,3,1,2,3,... Uncorrected Accelerogram Att) 1 = longitudinal axis, Allt) 2 = transverse axis, Attt) (256 samples per second ) 3 = vertical axis, Aytt) each at 256 samples per second. t Data are offset binary representation j (ofemplitudeinvolts, j r low-pass filter Att) by using Ormsby filter to get A,(t) Demultiplex raw accelerograms into three files: File 1 = A1(t) File 2 = At(t; , File 3 = Ay(t) Perform instrumental correction of A3(t) by using differential equation approach to obtain A2(t). See Reference EER1, 71-05 Transform offset binary numbers ! to volt.s. according to volts
- 5 -1 m Perfor1n baseline correction of A% (t) by high-pass filtering the data Oith
,, ormsby filter to get A (t).
See Reference 0- 7. Perform linear baseline correction by i calculating mean value for each file and subtracting this value from each data point in the file. QWF 'T
- 1. Correct ed accelerogram A3(t)
Amplitude values An volts are transformed 2. Velocity time history to units of g, using indivtdual accelerometer (3. Displacement time history j sensitivities [Uncorrected Accelerograms, OWPM: Att) 256 samples per second FIGURE 6 FIGURE 5 l Data Co/blitioning, E.D.R.S. Data Correction, E.D.R.S. 1 O l
o
^
O O O FIGURE 7 SANTA BARBARA EARTHQUAKE AUGUFT 13, 1978 - 1555 PDT U GOLETA SUBSTATION SCE, 34 28.0*N, 119 53.l'W COMP UP o PEAK VALUES : PCCEL = 105.9 CN/SEC/5EC VELOCITY = -5.6 Cn/5EC DISPL = 1.0 CH
-250 [ BANDWIDTH 0.03, 4.0 SEC butX u '
l 0 M,MS%', -'- - - = - - - = e3 - ;L W T 25e I - t ' ' -
~[ Tip L ) 1 5 & n. I n 'h nP R /
W 1
$9 j ,,%f N ly i \f%# # " 'f i t s! $
6 - - - '
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,. m
. . = . . . . . . ,
I REFERENCES Trifunac, M. D. (1970). Low Prequency Digitization Errors and a New Method for Zero Baseline Correction of Strong-Motion Accelerograms, Earthquake Engineering Research Laboratory, EERL 7 0-07, pgs. 32-52, California Institute of Technology, Pa sa dena Trifunac, M. D., P. E. Udwadia and A. G. Brady (1971). High Frequency Errors and Instrument Corrections of Strong-Motion Accelerograms, Earthquake Engineering Research Laboratory, EERL 71-05, pgs. 33-47, California Institute of Technology, Pasadena Trifunac, M. D. and V. Lee (1973). Routine Computer Processing of Strong-Motion Accelerograma, Earthquake Engineering Research Laboratory, EERL 73-03, Califorr.ia Institute of Technology, Pasadena h Ed. II--September 1984 0 4
l l y .
,- vu,-
l
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re m4 2A N Pa K i Pd E ,M i1 H I (. 5 I i 1
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2 Strong Motion Acceleration System
,,,,,,, x .. _ _
. x
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The SMA 3 is a multi-channel, centra!Ized recording, An SMA 3 can accommodate uo to 27 channe!S of ac. magnetic tape accelerograph system designed to celeiction data, usually from triaxial force balance ac-3 l detect and record strong local earthquakes. Typical ceterometers. Model FBA-3. Downhole triaxial sensors structural applications Include nuclear power plants, (FEA 130H) can be irmaned. and uniaxial and biaxial ac-( tall buildings, dams, offshore platforms and bridges. ceierometers may also oe used. The sensors may be The SMA-3, used with the companion SMP 1 located uo to 1500 'eet from the centrai recorcer. The Playback System, meets the requirements of U.S. TS-3 triaxial seismic trig;er is stancard with any SMA-3 NRC Regulatory Guide 1.12 and is being used at over system The SMA-3 corres succued with two cassettes 90 nuclear power plants around the world. per ecorc;ng sect:ct and ali mounting hardware anc maring connectors for the scec:fiec numcer of triggers and acce!erometers. USA -222 VISTS AVE., PASADEM CA 9I107 TEL (818) 795-Z'20. TELEX 6754c2KhvETRICS PSD e EUROPE RUE DE LA VIG;E 3. ?CC3 LAUSANNE SWIT2ERLANO TEL. 201C2E TELEX 455207
.....i,,,,
GENERAL DESCRIPTION iM g The SMA-3 is a versatde mult<hannel acceleration record- ~' T: ;E c ing system. It is self-actuating when a local earthquake < f4- 'u6
- exceeds a predetermined level of ground acceleration. 1 P, ,
When acceleration fa!!s below the preset value, the SMA 3 automatically returns to the standby condition. 5 ,
-- NI !
FMm The standard FBA-3 triaxial accelerometer package is ap- : - - - .
.r==
Q.-,' proximate!y a 20 centimeter cube. It contains three force-O I *T 4 0 * ^- D i balance accelerction sensors. The acceierometer pack- - --- -
-A "
C 3 ' ' '
- 6 age accepts calibration commands for damping and 0 C natural frequency. *'** e+* '
Each accelerometer signal is buffered, frequency C . , o modulated, and recorded on an assigned track of a four- *** track magnetic tape cassette. Three tracks are used for . .. acceleration data and the fourth for a timing signal, which is common for all recording tape transports in the system. o o TECHNICAL SPECIFICATIONS ' s M F3]
. - . . n; ....,.
O m SEISMIC TRIGGERS (Model TS 3) c .-: " - ". o Type: Tnaxial acceter: ten ingger I I
@ # 1
,-- 9 Housing: Cast aluminum, waterproof ^
l Set Point: 0.01g stancard; f eid adjustable. 0.005g to 0 05g !
,_. a ,
opton: Adiustment range of 0 025g to 0259 Current Drain. 0 45 mA in standby; 60 mA opersong ORDERING INFORMATION, SMA 3 Kinemetrics Part Number- 101100 TRANSDUCERS (Model FBA 3) Strong Motion Acceleration System, including: Type: Fem ba!ance accelerometers Housing st aluminum, waterproof One tnavial sersmic tngger, Mocci TS-3 Spec fy tnggenng thresnoid (0 01g standard) ang : sca e Spec ty numcer of ao@tenal tnggers it desned 19 Output;
- 2.5 V fuu sca:e Damoing. 70% of cr tical 93,3 n,ne inaxial acceieration sensors Mccei FSA-3 1 Og full scate Cost Opton-Mocet FBA-11 uniama. sensor a rato a p ng an natural frequency recorced by command Temperature Range ~20* to 70* C (Oa to 160* F) 0 nh 0- og e -
Scec:ry number anc type of sensors up to 27 channe:s Temperature Effects : 1.5% of full scale over operating range RECORDING SYSTEM Up m nine utaxia(tace recceng mowes. wim cassenes Cost Coton-mame res:stant winn; Type: Frequency modulat on Specify numoet of cnanne:s. up to twenty seven Tace. Four tract magnetic tape casset*e Taoe Soeed: 17/8" per second ControuPower Panet Recording Time- 30 minutes Cost Coton--Conversicn to 220 Vac Bandwetn: 0 to 50 Hz Dynamic Range: 40 c8 from 15* to 35' C (witn SMP-1) Accessoriest Modulatun Frecuency: 1000 Hz 2 50% modulaten. Tirmng Frecuency' 1024 Hz e 0 2% interconnecting Cacies for sessmic tnggens) System Accuracy (witn SMP 1r 2 5% at full scate. changing linearly Cost Option-Flame retataant cac.e to 1.5% of fun scale at 0.01g Scecify lengins reaucec uo to 1500' to eacn tngger Starts 2o Tirne. t.ess than 0.1 seconcs Event Alatm; Normally open contacts, rated 1 amo @ 12 Vdc. Interconnecting Cabies for remote accelerometers Event Indicatr: Electromagnetic wsual disclay Cost Cotion Flame retarcant cac!e Soec;fy tengms required. uo to 15c0 to eacn sensor 1%ncn Rack Mounting Cacmet Two 12 V intemai. rechargeacle catteres An intemat battery ct arger. Cost Ootion-Seismica9y craced caccet operatir g from 110 Vac, is sucatied OPERATING ENVIRONMENT Scares and Sezet Temcerave O' to 55' C (30* to 130' F) Humn emote m cacxa;es. tCO n R M Ma; et:cEm Des:ccaat Tacecces.Cassettes. San R Da(y*Cc30 Cactnet mountec cane s. 80% A H. non-concens:ng 12 V Banenes ca r). Pa t
- 0311a
@Kinemetncs July 1985 PnntM in U S.A.
,_ . - - - ~~ . . . . - . . . . . - . - . . .
i l 1 APPENDIX B TO P SEISMIC EVENT. EVALUATION FOR Tii E MARCil 1 5 ,- 1992 Mc = 3.5 E A R TIl O U A K E t-l l P E R 11 Y NUCLEAR PLANT . E N G D All L STRONG-MOTION DATA , i. l_
+=
MPL NUMBER: D51 R120
- O- .
LOCATION: RE ACTOR RECIRCULATION PUMP ACCELE R ATION (g) SENSOR LOCATION -- NORT H/50UT H (l.) E A3T/ WEST (T) VERTICAL
*Information not available at preparation time of this report.
TABLE B-1 ENGDAHL RECORDED DATA 03/15/'32 EARTHQUAKE O sir . .
MPL NUMBER: D51 R130
- LOCATION: HPC S INJECTION LINE 9
ACCELERATION (g) SENSOR LOCATION - NORTH / SOUTH (L) E AST/ WEST (T) VERTICAL
- Information not available at preparation time of this report.
O TABLE B-2 ENGDAHL RECDRDED DATA D3/15/92 EARTHQUAKE O
I) MPL NUMBER: DS1 R140 LOCATION: HPCS PUMP BASE MAT- 574' ACCELER ATION (g) SENSOR LOCATION - LEFT RIGHT NORTH / SOUTH (L) 0.0 O.0 7 E AST<WE ST (T) 0 038 0.019 VERTICAL 0.0 0.0 O TABLE B-3 ENGDAHL RECORDED DATA 03/15/92 EARTHQUAKE O
MPL NUMBER: D51 R160 LOCATION: REACTOR BUILDING FOUNDATION 574' $ 3 ACCE LE RATION (g) NOMINAL NU 1BER FREQUENCY North / South East / West Vertical (HERTZ) LEFT RIGHT LEFT RIGHT LEFT RIGHT 1 2.00 0.00199 0.0014 3.0023g 0.00009 0.000q 0.000g 2 2.52 0.0021g 0.0041a 0.00200 0.0013c 0.000g 0.000q 3 3.17 0.0032c 0.005aq 0.00459 0.0000c 0.000g 0.000g 4 4.00 0.0000g 0.00800 0.0000a 0.0000; 0.000g 0.000g 5 5.04 0.00000 0.01969 0.0048g 0.00009 0.000g 0.000g 6 6.35 0.0078a 0.0197o 0.0000a 0.0000c 0.000a 0.0000 7 8.00 0.00000 0.000g 0.0129a 0.0129a 0.gg 0,n000 8 10.1 0 onaan o nooan n onona o nonnd a qgon 0 0000 9 12.7 0.0000q 0.0154a 0.0220q 0.0145a 0.0000 0.000a 10 16.0 0.0000c 0.0253q 0.0366q 0.0366a 0.000a 0.000g 11 20.2 0.00000 0.0000g 0.0000g 0.0000c 0.000a 0.000g 12 25.4 0.0625a 0.0325a 0.00000 0.0000a 0.000a 0.0000 1ABLE B-4 ENGDAHL RECORDED DATA 03/15/92 EARTHQUAKE O
MPL NUMBER: D51-R170
- LOCATION: REACTOR HUILDING BIOSHIELD WAL L - D W 6 3 0', 2 4 0 '
ACCE LERATION (g) REED NOMINAL NUMBER FREQUENCY North / South EastN/est Vertical (HERTZ) __ __ 1 2.00 _ 2 2.52 3 3.17 4 4.00 5 S.04 6 6.35 7 8.00 g 8 10.1 9 12.7 10 16.0 11 20.2 12 25.4
*Inf ormation not available at preparation time of this report.
TABLE B-5 ENGUAHL RECORDED DATA 03/15/92 EARIHQUAKE O l
MPI, NU MHP.R: D51-R180
- LOCATION: IIPCS PUMP llASE M AT - 574' h
) ACCELERATION (g) NOMINAL REE NUppBER FREQUENCY North! South East / West Vertical' (HERTZ) 1 2.00 2 2.52 3 3.17 4 4.00 5 5.04 6 6.35 7 8.00 8 10.1 9 10 12.7 16.0 11 20.2 12 25 4
!I
*D51-R180 was out-of-service for repair duratig the seismic event. No dato dValldble.
TABLE B-6 ENGDAHL RECORDED DATA 03/15/92 EARTHQUAKE 9 i
r O ue'suMeER 05,.n,e0 LOCATION: RCIC PUMP BASE MAT 574" . ACCELER ATION (g) NOMINAL N hADER FREQUENCY North /$outh East / West Vertical * (HERTZ) _ s LEFT RIGHT LEFT RIGHT LEF) RIGHT t 1 2.00 0.006 0,00 0.00 0.004 NA NA i 2 2.52 0.007 0 00 0.003 0.002 NA NA 3 3.17 0.008 0.00 0.004 0.00 NA NA 4 4.00 0.00 0.00 0.004 0.004 NA NA 5 S.04 0.00 0.020 0.00 0.00 NA NA 0 6.35 0.00 0.00 0.00 0 00 !L NA NA 7 8.00 0.00 0.025 0.019 t.vJ fM NA 8 10.1 0.00 0.00 0.00 0.00 NA NA l 9 12] 0.00 0.00 0.00 0.00 NA NA 10 16.0 0.00 0.00 0,00 0.00 NA NA 11 20.2 0.00 0.00 0.00 0.00 NA NA 12 25.4 0.00 0.00 0.00 0 c0 NA NA
- Recordings f rom the Vertical component were d1111 cult tu read, 'rregular, and thought to be non seismic stratthes. these will be reviewc'; by our c.onsultant, Engdahl.
TABLE B-7 ENGDAHL RECORDED OATA 03/1S/92 FARTHQUAKE l O
O e APPENDIX C . TO SEISMIC EVENT EVALUATION POR Til E MARCil 15, 1992 Mc - 3.5 E A R T1100 A K E t O . PERRY NUCLEAH PLANT PDAS-100 RECORDINGS AND CAV CALLULATIONS 4 O
C. -Analysis of the'PDAS-100 Data Records of the Earthquake _of March 15, 1992 06:14 GMT C.1 Introduction t The 3/15/92 earthquake event was recorded by a portable digital seismograph (PDAS-100) installed at the Antioch ttation of the CEI Autostar network. The Antioch station is located about i km DIE of the Perry Nuclear Plant and approximately 8 km from the epicenter of the March 15th earthe,2ake. I At the time of the eerthquake, the PDAS-100 was configured to record two versical component channels and i horizontal component channel. _j
'Ihe PDAS-100 was in this configuration to " base-1.~ ne" the unit with the Autostar Network. All channels were enabled to record at 100 samples per second.' The transducer for one of the vertical I components is a PA20 accelerometer (teledyne-Geotech). This i h- accelerometer was installed at ground surface ta a wood floor of a small shed which houses the telemetry of the Antioch seismic station.
The second vertical component included an L-28 velocity transducer (Mark Products) with t natural frequency of 4.5 herta. The horizontal component also included an L-28 velocity transducer. Both the vertical and horizontal L-28 velocity transducers are installed 1 in a waterproof lexen bc.~. and installed outside the Autostar instrument shed. The lexan box and velocity transducers are buried at a depth of about 1 foot below ground surface. It should be noted that the Antioch site has a stratigraphic column of about 70 feet of-overburden'over Paleozoic bedrock. Thus, PDAS-100 ground surfa'ce' i records discussed below were recorded at a 'soit site'. . C.2 Recorded Ground Motion [ The PA20 vertical component record was correctei for instrument sensitivity'(i.e. 5 volts /g) to obtain the accelerogram shown at the O C-1 - l l
----.___....~..,.--..__..___,.-._.._.__-,-.-_.,-,.._-,.m..._.-.-.,.... - - . . . _ - -
i top of figure C.1. Tb peak acceleration for this record is 0.014 9. Tourier Amplitude Spectrum and Power Spectral Density plots shewn on Figure C.1 illuttrate the frequency composition of the PA29 vertical component accelerogram. Dominant frequencies are at 10.9 and 11.7 hertz. Other spectral peakt, occur at 5, 7, 14.3, and 18.8 herts. It is noted that the PA 29 record exhibited additional high frequency , energy at frequencies of about 38 to 42 hertz. Similar amplitude high frequencies were not present in the L-28 vertical record buried in the ground near the small instrument shed. The high frequencies are attributed to resonance of the wooden shed. These high frequencies were filtered using a cut-off frequency of 30 hertz. The peak acceleration of the unfiltered record was slightly higher at
-0.0169.
More extensive processing was required to generate acceleration time histories for the vertical and horizontal ground motions recorded by the L-28 velocity transducers. Ground velocities were computed using the published instrument sensitivities (i.e. 0.65 volts / inch /second). Next, the time derivative was taken of the velocity record te derive ground acceleration records. Shown on Figure C.2 is the vertical component L-28 derived accelerogram. The peak ground acceleration is 0.00959 . Spectral composition of this L-28 record is similar to that recorded by the PA20 acceleremeter. Dominant spectral peaks are at about 10.6 and 11.8 hertz, secondary peaks occur at 5, 7, 13.2 and 17.8 hertz. I Application of the same data processing stream to the L-28 horizontal component ground response record resulted in the accelerogram shown on Figure C.3. The peak acceleration of this record is 0.102 , 9about a factor of 10 larger than the corresponding L-28 vertical component acceleration time history. As can be seen in the time history, the C-2
.rw.
-peak acceleration in associated with one cycle of high amplitude S-wave motion. The dominant frequency of the lateral acceleration is at 11.5 hertz. Other peaks occur at 5.2 and 13.7 hertz.
-C.3 Cumulative Absolute Velocity (CAV)
Cumulative absolute velocity (CAV) has been promoted as an alternative measure of grcund motion intensity, which perhaps is better correlated to damage potential than is peak acceleration, especially if the peak acceleration is associated with high ground motion frequencies. The formulation used tc calculate CAV values from the PDAS-100 data fc,r the 3/15/92 event it defined in EPRI NP-5930, Project 2848-16, A Criterion for Determining Exceedance of the Operating Basis Earthquake, Pinal_ Report dated 7/88. CAV can-be computed for the entire duration of the recorded time history. It should be noted that approximately 70 set.onds of coda h were recorded by the PDAS for Lao March 15th earthquake. Pigures C.4 thru C.6 show 10.24 seconds of the record beginning at the P-wave arrival. Although the entire records have a duration of about 70 seconds, highest accelerations are observed in the first 4 to 5 seconds af ter initial P-wave arrival. Amplitudes are relatively small at 10 seconds from the beginning of the event. CAV is thus computed for the 10.24 seconds of ground motion shown on Pigures C.4 thru C.6 for the PA20 (vertical), L-20 (vertical), and L-28 (horizontal), respectively. Resultant CAV's for these records are .012 g-sec, .0077 g-sec, and
.026 g-sec, respectively. -
- cmparison of the CAV of .026 g-sec computed for the L-28 horizontal component record with CAv's determined by the OBE Exceedance Working Panel '(EPRI RP2843-16),
suggests-that the associated site intensity at the Antioch site for the March 15th earthquake was about III on the Modified Mercalli LO (.- 3
)
J Scale. Seven records with CAV's ranging from .021 to .027 g-sec are listed in the referenced EPRI OBE Exceedance report. Ptrameters of I these events are listed belov. Record No. Earthquake Magnitude Site Intensity CAV 42 South Carolina 2.7 III (3.3) .027 43 South Carolina 2.7 III (3.3) .024 89 Oroville CA 4.1 III (3.2) .027 101 Oroville. CA 4.1 III (3.2) .027 140 Oroville, CA 4.0 III (3.2) .021 141 Oroville, CA 4.0 III (3.2) .022 248 Ancona, Italy 3.5 III (3.7) .027 Comparlsr- of the CAV's (and associated magnitudes and site intensities) with the CAV of .026 determined for the Antioch site confirms that the local intensity was lov, on the order of about III (HMI scale). As noted above, the Antioch site is a ' soil site' and lll the records likely have some level of amplification relative to an adjacent bedrock site. Intensities and CAV's estimated for the nearby Perry Nuclear Plant, founded on bedrock, are at most, equivalent to but likely smaller than those observed at the Antioch seismograph site. It is concluded that although instrumentation at the plant was triggered by the March 15 event, ground motions were veil belov' levels required to cause damage to structures or equipment. t ( l C4 lll
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- Timo ncquired
- 16:43: 07.41
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Time Acquired: 16:25:53.60
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,.3 20-1992- -- - Comnents! Nona '9 Time ncquired: 13:10:57.37 Vert Ur.itt C(v) i Horiz Units: See i Ntun Samples: 1H24 '
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_Date Acqulend: _ 3-19-1992, ' Cmine nt s : None IIONE C b T ime o.c. qu..i red :
..- . . . . . . .16:23:5%.93 .
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