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Unit One Loose Parts Monitoring Sys Special Rept
	ML20062D904
Person / Time
Site:	Comanche Peak
Issue date:	11/12/1990
From:	; TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	;
Shared Package
ML20062D894	List: ML20062D889; ML20062D895; ML20062D904;
References
	NUDOCS 9011190122
	Download: ML20062D904 (85)
	v • d • e

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i ABSTRACT i Regulating Guide 1.133 Revision 1, May 1981. Section C.3.a.(2)(a) requires i the power operation alert levels of the Loose Parts Monitoring System (LPMS) to be reported to the Nuclear Regulatory Commission following the initial startup program. This report was written to comply with this requirement. The power operation alert levels for the individual LPMS channels were based on the comparison and analysis of;. l (1) The basic system sensitivity during plant shutdown..and (2) The background noise measured *during normal plant power operation, i l i } i i i 9 e I (

i LPMS Special.' Report Table of Contents l t P_ age, l Section a 1.0 Introduction 1

1.1 System Description

1 l Table 1 CPSES LPM Sensor location 1 2.0 Methodology 3 I 2.1 Data Acquisition 3 [ t 2.2 Data Analysis 3 Figure 1 Hi Alara Process 7 3.0 Data 3.1 Impact Amplitudes 8 [ 3.2 Impact Frequency Spectrum 9 3.3 Background Amplitude (Power Operation)' 10 3.4 Background Frequency Spectrum (100% Power)' 11 3.5 Adjacent Channel Response 12 3.6 Calibration Traces 13 3.7 Data Summation 14 Table 2 CPSES LPMS Data Summation 16 1 4 4.0 Discussion of Results

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1.0 INTRODUCTION

i i The purpose of this report is to: Describe the loose parts monitor system for.CPSES. o Describe the methodology used to measure impact energy sensitivity. o i o Discuss the results of LPMS associated test and data reduction, Document the LPMS power operation alert lev 61s at completion of the ] o ISU test program. )

1.1 System Description

.f The Loose Parts Monitoring System employed at CPSES is the Babcock & Wilcox (B&W) reactor diagnostic ~ system (RDS). This system is designed to monitor, alarm and diagnose loose parts. The Loose Parts Monitoring System uses an array of active _and passive accelerometers to detect metal to metal impacts' indicative ~, of loose parts in the RCS. The accelerometers are permanently installed at selected locations where'a loose part would tend to l collect or impact.. The locations of the accelerometers provide a high degree of reliability in the detection of metal to metal' impact in the reactor coolant system. Two accelerometers are located at each of the following locations: o Reactor Pressure Vessel Upper Head Region o Reactor Pressure Vessel - Lower Region _ t All Steam Generators. Primary Coolant Inlet Region o one accelerometer is located at each of the following locations: o All Reactor Coolant Pumps i All Steam Generators Upper Region f o The accelerometers operate on tho'piezoelectic crystal effect with deformation of the crystal producing a measurable proportional charge. This signal is amplified,-filtered, and conditioned to accentuate the frequency band known by measurement to correspond to metal to metal impacts. The system is designed _to alarm the presance of unusual noises above normal background' noise present in the plant. The system comprises eight active and twelve passive accelerometer channels. The active channels are monitored continuous 1y'for detection of loose parts. The passive channels _ are used for diagnostics (location determination) of a-loose.part c that has been detected. Sensor locations and LPM used for signal processing are shown in Table 1._ Page 1 I r -

l l 'I TABLE 1 CPSCS Loose Parts Monitoring Sensor Locations PROCESS SENSOR MODULE TYPE LOCATION 1 ] 1 LPM 1 ACTIVE SG "A" Inlet l { 2 LPM 1 PASSIVE SG "A" Inlet 3 LPM 2 PASSIVE RCP "A" 4 LPM 3 PASSIVE SG "A" Level Tap 5 LPM 2 ACTIVE SG."B" Inlet l 6 LPM 4 PASSIVE SG "B" Inlet i 7 LPM 5 PASSIVE RCP "B" 8 LPM 6 PASSIVE' .50 *B" Level Tap 9 LPM 3 ACTIVE SG "C" Inlet 10 LPM 7 PASSIVE SG "C" Inlet 11 LPM 8 PASSIVE RCP "C" P 12 LPM 1 PASSIVE SG "C" Level Tap 13 LPM 4 ACTIVE SG "D" Inlet 14 LPM 2 PASSIVE SG "D" Inlet 15 LPM 3 PASSIVE RCP "D" 16 LPM 4 PASSIVE SG "D" Level Tap 17 LPM 5 ACTIVE Reactor Cavity 18 LPM 6 ACTIVE Reactor Cavity 19 LPM 7 ACTIVE Reactor Head l 20 LPM 8 ACTIVE Reactor Head t Page 2 )

~ 2.0 METHOD 0LocY u 2.1 Data Acquisition i 2.1.1 Impact energy. data was collected during plant shutdown as part I of the pre operational test program under procedure 1CP-PT 91 01 SFT. The data was directly recorded on magnetic l tape using the integral four channel reel to reel tape decks that were supplied with the LPMS. Impacts were imparted using calibrated weights of 0.25 lba and 30 lba within 3 feet of the sensor at a kinetic energy of 0.5 ft lb (0.68 joules). l \\ 2.1.2 Operational baseline (background noise) data was recorded at reactor power levels of 0, 30, 50, 75 and 100% during the initial plant startup program under procedure 15U 211.. [ 2.1.3 Procedure PPT TP 90 025 documented the spectral comparison of. data collected in 2.1.1 and 2.1.2,: above. From this i comparison, band pass filter " break frequencies" were determined., Filters were adjusted to band limit the broad band signal to' that portion of the spectra that - maximizes the signal to noise ratio. Following filter adjustments background notes was measured to establish alert levels per Reg, Guide 1.133 Section C.2'. 2.2 Data Analysis Procedure PPT TP 90A 025 was developed'to document data analysis e and bandpass filter adjustments for determination of final alarm t settings and power operation alert levels. -The_following is a t chronological sequence on the performance of PPT TP 90A 025, i 2.2.1 Tapes recorded during the-performance of pre operational test i icP PT 9101 SFT were obtained from the document control. center vault. Each tape had a calibration signal of I 1KHz/1Vrms recorded as a predecessor to impact and background data. l Prior to tape analysis =a 1KHz/1Vrms function generator signal was injected into a digital oscilloscope and spectrum analyzer with outputs routed to-an X Y plotter. Adjustments were made to the X-Y plotter to ensure linearity between graph paper j scaling vs. actual signal to allow direct amplitude interpretation._ The taped 1KHz/lVras calibration rignals were played back for-each recorder channel and used to determine a " correction factor" to account for any losses associated between taped signals and actual field signal strength. Page 3 i

4 1 i Following ' correction f4:ctor' determination, recorded impact amplitude and transient capture frequency spectrum were ) plotted. Impact amplitudes (Vpp), with the 0.25 lba weight, j were normalized to g's p p by multiplying'each signal by the correction factor and module full scale range settings (g/v). j i Sensor response to a 30 lba weight impact.was calculated by comparing the measured response difference between the 0.25 i Iba and 30 lba impacts' at one of the sensor locations. This value was also normalized to g's p p. j n 2.2.2 Tapes of background (baseline) data at 100% Reactor Power were i played back and analyzed for frequency content.A spectral-f comparison was performed between the background and impact i frequencies to determine

break frequencies" for bandpass filter adjustment.

1 After filter tuning, background noise was measured and normalized to g's p p to provide a basis for alert level and. alarm sensitivity settings. 2.2.3 In order to.have a basic understanding of the LPMS signali ~ processing at CPSES and the desired sensitivity requirements as stated in Reg. Guide 1.133 the following is provided: NRC Regulatory Guide 1.133 makes the follow!ng statement concerning sensitivity.. "The on line sensitivity.of the automatic detection system should be such that, as a minimum, the syst.em can detect a metallic loose part that weight from. 25.lb (0.11 kg) to 30 lb L (13.6 Kg) and impacts with a kinetic energy of,0.5 ft.lb (0.68 joules) on the inside surface of the reactor coolant pressure boundary within 3 feet (0.91 meter) of a sensor. If the. recommended sensitivity cannot be achieved by automatic alert - } because of specific in plant conditions, these conditions and the actual on line sensitivity should be specified at the time the alert level is provided.- As an example one acceptable method of verifying this on line sensitivity is to demonstrate v (1) the basic system sensitivity during the plant shutdown and (2) that the background noise measured during normal plant operation is sufficiently small that the_ signal associated. with the specified detectable loose.part. impact would be t clearly discernible in the presence of this background noise." l As the Commission position' infers, the ability to detect a given impact energy is. dependent on system background noise level and on the size of the impacting object. - Typical l _ background acceleration noise level (g) ranges from.lg tc 2g l peak to peak. During testing and calibration of BW LPM Systems, acceleration response to's 0.5 ft lb impact has been< l a Page 4 l t ~.. ,, ~,... _,

i measured from > 30g for a 0.25-lb ball down to 0.4g for a 30 - Ib. ball. P.us, the lower level 0.5 ft lb impact responses i could be masked by the background noise and therefore be undetectable. In this case the specific in plant conditions and the actual on line sensitivity would have'to be specified. The alarm threshold circuitry resides with the. loose part 1 detectos module (LPM) for each of the eight active channels at CPSES (see Fig. 1). Each module contains an Automatic Cain-Control (ACC) circuit which allows a floating alarm threshold. The ACC output' signal _is routed to the alarm comparator and is j adjusted for an output of 5 volts d.c. The input to'the,ACC j is a d.c. value proportional to the AC output of'the' sensor j J (accelerometer). The ACC output ($ Vd.c.) remains constant. for slow changes or long term variations'in the background noise levels due to plant operating parameters. If a i J loose parts signal occurs, the ACC circuit is too slow to react so that the transient (impact. signal) adds to the output of the ACC circuit. The reference or comparator.setpoint, is determined by the HI ALARM setting selected on the. individual LPM, When the ACC output. exceeds-the alarm threshold, the comparator switches giving an alarm.. This explanation is to show that the high' alarm threshold is actually a ratio of the normal operating background noise level to the impact amplitude.For example, if the alarm threshold (H1 A1 ARM) is set on 3 (or 7.0 volts) then the alarm ratio is 7 : 5 or 1.4:1 and the impact signal must exceed the background noise by 1.4:1 to trigger the alarm. Transients I with amplitude less than background noise would not be detected. 4 The ACC circuit 1s-part of the discrimination designed into the LPMS to help prevent spurious alarms. In addition there is logic discrimination within the Digital Loose Parts Locator (DLPL) that affects sensitivity. The DLPL requires at least two channels to alarm to consider an alarm condition to be valid. This two channel' criteria means=that sensitivity is i determined by the ad_1acent sensor and not the sensor nearest the impact origin. 2.2.4 Alert levels that would provide early detection of a loose part with a minimum amount of false alarms were determined originally.by adjusting the Hi Alarm setpoint to the lowest non alarming setting while operating at the 1006 power plateau. For the eight (8) active LPMS channels, adjacent sensors were monitored during impacts to determine ifiche sensitivity (Hi Alarm) settings were adequate to automatically detect a 1 loose part under power operation background noise levels. As an example, if the background noise signal after filter adjustments measured 100 millivolts. p p and the Full Scale t (F.S.) Range LPM setting was 3 g/V,'the background amplitude would be 0.3g p p. Page 5 t 5 ~ .~ -r-w e -r*

If the Hi Alarm setting is at 5 which. corresponds to 9.0 volts, the AGC is at 5.0 volts, then the alarm ratio would be i 1.8:1 and the si nal impact pertubation must be at least 1.8 l 5 times 5reater than background (0.540'p.p in this. example) to cause an alarm. i The adjacent sensor response can nc w be compared'to this alert j level'to determine if thersysten 19 sensitive enough to detect a loose part above background noir.o levels, j f i t i D i l t h [ .P Page 6 s

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i 3.0 Data 3.1 Impact Amplitudes The following X.Y plots were made using data collected during pre. operational test ICP PT.91 01 SFT. Sensor settings and impact weight is listed in the upper right. hand corner of each graph. Highest peak.to. peak voltage levels are' recorded on the y. axis. The peak voltage is then multiplied by the " tape loss" correction factor and the Full Scale Setting of the LPM to detenine Impact Amplitude in g's(p.p). i ? f 8 i r L f i l i l l Page 8 i w -~- 4

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and amplitude. response and-individual characteristics.
Description 1 of each column is listed below: Sensor - Sensor I.D. for which' data is-applicable for. Loose Parts Module'used for: processing' sensor. signal LPM. during data collection.and analysis. Filter Settings Based on the average values.of low and'high break- ~ -frequencies for thetactive sensor channels. Low end " break frequency" given in Kilohertz j High Pass (KHz).. The high pass -filter is adjusted'so-that the procassed. signal;is attenuatedLto l -70.7%.at this' frequency.. Frequencies lower < than this'value'will betattenuated even greater. Processed = signal,. strength at twice this frequency willibe approximate 1'y 1004, j Low Pasa, H!gh end " break frequency" given-in Kilohertz! e
(KHz).
The low pass filter is adjusted so that-the processed signal is attenuated:to 70.7% at- 'this frequency..-Frequencies; higher;than this. a value will be; attenuated even, greater.,
i Processed signal: strength;atione half this frequency will.be approximately:1004.-
Background Noise Leveli -' This value, given'in g's peak-to peak;- is'the. normal. operating background noise level. This value was determined-after'bandpass filters' where -adjusted. 7 - This settingf(l? hru-6)f ndicates the.inputf ( Hi-Alarm Setting t i ratio value required.to bring-in an alarm.' d ' Alarm settings and equivalent l ratios are listed. below. 4 j n Hi-Alarm Settinal LRatio i 1
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3 1.4;
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5 2 0-Alert Level'-- This'value,.given in g's peak to peak,Jis the I-required. signal' strength at power, operation,- to., l bring in antalarm. -The.value-is a-direct' function: '] of thatnormal operating ba'ckground signal strength! l 7 times the Hi-Alarm, equivalent ratio. Page.14 1 [ b' a l
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-I q Sensor Response" 1 0.25 lba ' This value~,~in g's peak to peak",;was; ) tho' measured response when impacting s e -the associated piping within 3 feet of .the~1isted sensor with~a calibrated j weight of Oi25 lba at a kinetic energy of 0.5ft/lbs. 1This value. in s's peak'to peak, was 'I 30 lba - the' calculated response.for impaccing'. 3 the associated piping within 3 feet of the listed sensor. with a calibrated" weight of:30:1ba at a kinetic energy' of'. V 0.5 ft./lbs.M Calculated resporse_was based on the' ratio.of the actual measure response between.the 0.25 lba; t. and.30 lba' impacts for Sensor 3., i i, l Adjacent Sensor Response- ---~ This value, in:g's peak to peak, was 0.25 lba 3.,. .i ..the strongest measured response for.an! ' adjacent sensor when impacting -the associated. piping' within 3 feet of' the ' j listed sensor withia' calibrated weight- '1 of:0,25 lba!at a. kinetic energy of'O.5-f t. /lb s '.., This value,~in'g's' peak co peak, war .30 1bm 'the ' calculated response for :an adjacent ' -sensor when11mpactingithe associated l piping within-3 feet of the. listed 1 sensor with;a; calibrated with of.30 Ibn
at alkinetic: energy.of 0.5.ft/lb's'.
= Calculated response was based on the samelratio'as'the actual'meacured -response betwe'en:the;0.25:1bm and 30 lba impacts;for: Sensor. 3. { Notes-Active sensor, continuously monitoredlfor detect' ion of l'oose parts 1. Adjacent sensor re_sponse not; required for' passive. sensors since no 2. automatic ~ alarm detection is:involvede U 3. Passive sensor, used for diagnostics after a loose part. Sensor response: for 301ba -object';is ' actual measured value, 4 . Highest adjacent sensorL. response ne'asured' on Sensor:#19. 5. + l -6. .-Highest adjacent sensor response measured 'on' Sensor #17. ) .l Highest adjacent sensor response ' measured lon1 Sensor #18' 7. s 8. Highest adjacent sensor response measured.on Sensor #20. 'Page 15 1 ,h t g.. e , ~ 's ' i, w -~~n -aw e ~
-Table'2 CPSES LPMS Data Sunnation H i ADJACENT FILTER SE771N06 Background -Alert l SENSCm RESPONSE - BEN 8(a RESPONSE I High Pese Low Pese Noise Level' E!*Alore Level 0.25 lbe 30 1ha '. 0.25 1he ~ 30 1he ' Sensor @ (ps) (Us). (a D-D) - Settina (a e s): (a e-n): (a n-e) (a e-e) (a 0-0) ' Notes l 1 1 2 11 0.55 5 0.99 11.52 ' S.76, l3.23. 1.62 , 1,5, 2 1 2 11 0.32 18.90-. 9.45 N/A-N/A 2,3' 3 2 2 11 0.86
13.71 6.06 N/A-N/A.
2,3,4 4 3 2 11 0.43 85.60 42.80 N/A N/A' 2.3 - i 2 2 11' O.27 5
0.40 12.84 6.42
. 3.31 : 1.66' 1,5 J 6 4 2 11 0.45 13.29 6.05 N/A ~ 'N/A 2,3 7 5 2 11 0.03 6.54 3.27 N/A~ N/A. 2.3 :. 6 6 2 11 0.32 .-73.80 _36.90 N/A; N/A 2,3 1 0 3 2 11 0.97 'S 1.75 8.$$' 4.43 '2.89 1.45 1,5 .i 'O 7 2 11 0.99' 8.85-4.43 N/A . F/A 2,3 "t 11 8 2 11 2.57 13.71-8.86 ,N/A . N/A ' 2,3 12 1 2 11. 0.31 73.00 36.90 N/A N/A 2,3-13 4 2 11 0.38 5 0.68. '4.77 2.30-2.00 1.40 1,5 2 2 11 0.62 '8.8S( I '.43 N/A.- N/A 2,3 4 15 3 '2 11 0.10 14.16- -7.04-N/A N/A 2,3 16 4 2 11 0.47 100.30' $0.15 - N/A N/A 2,3 1 ~ 87 S 2 11 0.34 0.25 28.32 ' 14.16 2.46 -1'23 '1,7, 18 6 2 11 0.46 'S 0.83-91.50 45.75. 2.30 - 1.19 '1,6 le 7 2 11 1.10 4 1,76 48.70 24.35 3.57 11.70 68 20. 8 2 11 2.02 4 .3.23 .' 14.16 ' _7.08 8.07' -4.04 ~ 1,S Page 16. L i t i 3 4 y
e .~, i- .<} '~ ) 4 i Jc 1 3 4.0 Results .{ 1 As can be seen-from'results' documented in TableL2 the' normal: operating: l background. levels:for the active sensors; range'from 0;14 to 2.02 g's 1 peak to peak.' The noisiestidata was obtained from sensors: located on.the~ l reactor hende Based on the' final HI-ALARM settings' recorded in ISU 211A, it was determined that system performance would be improved if i sensitivity was' increased on theitwo sensors located on theEreactor head. 1 Work Order C90 7073 was issued to increase-the sensitivity of these-j sensors-by decreasing the HI-ALARM settings from.5,to'4., Sensor.resporte indicates that oach active LPM' module will alarm when the piping is: impacted with,an obj ect weighing 0.25' lbas' to = 30 '1 bas at an impact energy of 0.5 ft. lbs'.,within-3 feet of the sensor. :The 30 lbe response was calculated based on the ratio of an actual 30;1ba to a0.25 j
This-ratio was. determined to'be lba impact at the #3' sensor location.
approximately 1:2 which would indicate' that/the 30 lba impact accelerometer response (output)3would be'approximatelyione half of tho' 0.25 lba impact. When looking at actual alert levels for each of :tho ' active channels'thes30 lba response ratio could~be as low as.-1:4;3 (or' d 23% of the-0.25 lba response),and still;resultiin an alarm' condition.- Adjacent sensor response, rhich would be required to automatically ^ ~ f uitiate.the main ~ control room annunciation, ? indicates that an object. ~ weighing'O.25 lbasaimpacting st an energy of 0.5-ft.: lbs.within 3.ft.. of the rensor would easily be detected. 30;1ba objectacimpacting st'the- -same, location and:with the same energy are(less likelyLtoibring incthe-L main' control' board annunciation as canl be seen from the' adjacent; sensor: 9 + 3 response column in TableL2.~ This decrease in overall system sensitivity can be attributed to-" active" sensor location. ' All four steam' generator inlets have one active sensor. The = best adjacent : sensor response was - measured at sensor 19 on the reactor head,when: impacting:near the SG - inlet sensors. j 2 - l> [ o i I l J r Page 17; 1 w r ie, g-- -r 6 + c ,,i,---w,,4 ,c-- w w -m---, - wd -*p w e g--ww+-, m .-e =>}}

ML20062D904

Text

1.1 System Description

1.0 INTRODUCTION

1.1 System Description

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