ML20076D016

Extended Blowdown Test,Evaluation of Suppression Pool Temp Measurements

ML20076D016
Person / Time
Site:	LaSalle
Issue date:	08/01/1983
From:	Field R, Weber N SARGENT & LUNDY, INC.
To:
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ML20076C995	List: ML20076C993 ML20076D016
References
NUDOCS 8308230250
Download: ML20076D016 (108)

Text

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_ ;In-Plant SRV Extended Blowdown Test -

Evaluation of Suppression Pool Temperature Measurements R

La salle County Station Unit i .: :, ,:  :.;

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f COMMONWEALTH EDISON i

COMPANY PROPRIETARY LASALLE COUNTY l IN-PLANT S/RV TEET EXTENDED BLONDOWN TEST EVALUATION OF SUPPRESSION POOL TEMPERATURE MEASUREMENTS PREPARED BY SARGENT & LUNDY Prepared by: WA h f,' Sa-: _jate:ffyy l , lfj' Reviewed by: ,- ,_ M k / h , '

Date: fa/ / ~ -//S Approved by: 1 M't 'M4 ' Date: - 'I ' '~

Approved by: f y/p [ t. Date:je jf,_// /9fff i //

PROPRIETARY NOTICE PROPRIETARY DOCUMENT - This document is the property of the Commonwealth Edison Company and was prepared by Sargent & Lundy. This document is not to be reproduced or furnished to third parties without the prior express written permission of the Commonwealth Edison Company.

i

ABSTRACT This report presents the results of the extended S/RV blowdown tests performed at the LaSalle County Station Unit 1 in December 1982. These tests were part of an in-plant S/RV test program designed to provide data used to (1) confirm that the containment can safely accommodate all hydrodynamic ' loads and thermal effects associated with S/RV actuation and (2) demonstrate adequate plant design margins for these eff ects. The objectives of the extended blowdown tests were to examine the thermal response of the suppression pool to S/RV discharge. Measurements were made to evaluate (1) thermal mixing of the suppression pool and (2) the adequacy of the suppression cool temperature monitoring system (SPTMS) in indicating bulk pool temperature. These measurements also provide plant unique data on which to base the technical specifications concerning suppression pool temperature limits.

Results of the tests show the average local-to-bulk pool temperature difference for S/RV discharge to be 8.1 F with a 95/95 confidence level of non-exceedance of 12.0UF. Tests results also confirm that the SPTMS provides a conservative measure of the bulk pool temperature. An evaluation of the technical specifi-cations concerning suppression pool temperature limits was also made, and where as these limits apply to more than S/RV discharge considerations, the U

current specifications were found to have a 20 F margin for this phenomenon.

ii

l i

TABLE OF CONTENTS Page ABSTRACT ii

1.0 INTRODUCTION

1-1 1.1 Background 1-1 1.2 Test Objectives 1.- l 1.3 Technical Specifications 1-2 1.4 Report Outline 1-2 2.0 TEST DESCRIPTION 2-1 3.0 INSTRUMENTATION AND DATA PROCESSING 3-1 3.1 Permanent Instrumentation (SPTMS) 3-1 3.2 Test Instrumentation 3-2 3.3 Data Acquisition 3-3

~

3.4 Data Reduction 3-4 4.0 DISCUSSION OF RESULTS 4-1 4.1 Bulk Pool Temperature 4-1 4.2 Local-to-Bulk Pool Temperature Difference 4-2 4.3 SPTMS Response 4-4 4.4 General Observations 4-5 5.0 EVALUATION OF SPTMS OPERATION AND TECHNICAL 5-1 SPECIFICATIONS 5.1 SPTMS Operation 5-2 5.2 Technical Specifications 5-8 6.0 COMPARISON OF RESULTS TO ACCEPTANCE CRITERI A 6-1 6.1 Acceptance Criteria 6-1 6.2 Local Pool Temperature 6-2 6.3 Suppression Pool Temperature Monitoring 6-3 System

7.0 REFERENCES

7-1 APPENDIX A - Bulk Pool Temperature Calculation A-1 APPENDIX B - Applicability of Data to Higher Pool B-1 Temperatures APPENDIX C - Figures C-1 111

LIST OF TABLES Page Table 2-1: Test Conditions 2-?

Table 4-1: S.W.A. Bulk Pool Temperature 4-8 Table 4-2: Local-to-Bulk Pool Temperature Dif f erence 4-9 Table 4-3: Range of SPTMS Sensor Readings above Bulk Pool Temperature 4'O Table 5-1: SPTMS Locations Reading Below Bulk Pool Temperature 5-1?

Table 5-2: Comparison of the Degraded SPTMS Divisions 5 13 Table 5-3: Parametric Study of Technical Specification Limits on Suopression Chamber Operability 5-14 Table 6-1: SPTMS Performance 6-6 LIST OF FIGURES P ag e Figure 2-1: Suppression Pool Layout Elevation View 2-3 Figure 3-1: Test Temperature Sensor Locations in Suppression Pool - Plan View 3-5 Figure 3-2: Temperature Sensor Location and Zone Map for Suppressional Pool - Elevation View 3-6 Figure 4-1: SPTMS Resoonse to Stratification Ef fects 4 11 Figure 4-2: T3, T31, and T48 Response - Run 71 4-13 Figure 4-3: Evaluation of SPTMS Bias 4-14 Figure 4-4: Sensor Location for System Bias Calculation 4 '_5 Figure 5-1: Parametric Study - Suppression Pool Temperature Margin 5-15 Figure 5-2: Anatomy of the Suppression Pool 51.6 Temperature Limit Figure 6-l: Suppression Pool Temperature Envelope 6-7 iv

l

1.1 BACKGROUND

In-plant safety / relief valve (S/RV) discharge tests were performed at the LaSalle County Nuclear Power Station in December 1982. Part of these tests was a ser ies of seven extended S/RV blowdowns to examine various aspects of thermal mixing within the supptession pool. A detailed description of the test plan for these tests is given in the Sargent &

Lundy report "LaSalle County 1 - In-Plant S/RV Test Plan"

[1].

The 18 S/RV's for each reactor at the LaSalle Station provide overpressure protection for the primary syste'a. Discharge steam from each S/RV is routed from the primary system to the wetwell via an S/RV discharge line. Each line terminates at a submerged T-Quencher which is aproximately 23-ft. below the suppression pool surface.

A T-Quencher is a device which distributes steam flow as it enters the pool in order to promote uniform condensation.

At elevated pool water temperatures the condensation process may become unstable and thereby produce large hydrodynamic loads within the suppression pool. In order to preclude this possibility, administrative procedures and technical specifications are established such that elevated pool water temperature beyond the stable steam condensation regime cannot occur. An account of the history of this subject and current regulatory requirements is contained in the NRC document NUREG-0783, " Suppression Pool Temperature Limits for BWR Containments" [ 2].

1.2 TEST OBJECTIVES The extended blowdown tests were performed as a part of an extensive In-Plant S/RV Test Program [d . In addition 1-1

to the primary test nrogram objective of confirming the design adequacy of the containment to safely accommodate hydrodynamic loading, the objectives of this cortion of the test program were to determine olant unjoue thermal effects, specifically: 1) the maximum local-to-5ulk 9001 temperature difference during S/RV discharge and 2) the adequacy of the suppression pool temperature mon itor ing -

system (SPTMS).

1.3 TECHNICAL SPECIFICATIONS The current operator action points on suppression cool temoer-ature found in the LaSalle Technical Specifications [ 4 ]

are based upon generic data. The extended blowdown tests provide an opportunity to revise these technical specifi-cations based upon plant specific data. This report uses test data to determine the margins in the current operator action points. Also examined are the factors involved in establishing more realistic operator action points which allow for a wider range of plant operability.

1.4 REPORT OUTLINE The sections in this report contain the following information:

Section 2 gives a description of the test procedure as well as of the general suopression pool layout.

Section 3 gives a description of both the test and SPT!!S instrumentation at well as of the data processing system for tect data.

Section 4 nresents measured and comnuted results fror the test. A number of general observations about the test are also included.

Section 5 gives an evaluation on use of the SPTMS and an examination of the technical speci fications concerning suooression pool temperature.

Section 6 gives a comparison of the measured and computed test results to the acceptance criteria for maximum local pool temperature and SPTMS response.

Section 7 contains references cited in this report.

1-2

I L

Appendix A presents the calculations used to obtain the bulk pool temperatures for the seven tests.

Appendix B demonstrates the applicability of the measured data (taken at pool temperatures ranging between 58 F and 97 F) to higher bulk pool temperatures (up to 200 F).

Appendix C contains plotted test data from the seven test runs.

1-3

2.0 TEST DESCRIPTION The LaSalle County Station is a two unit Mark II containment BWR plant. Each reactor has a total of 18 S/RV's and attendant discharge lines and T-Quenchers. Two of these quenchers (C and G) were used in the extended blowdown tests. Quencher C is located at a radius of 36.5 ft and at plant azimuth 230 while quencher G is located at a radius of 20.6 ft and at plant azimuth 210 (Figure 2-1).

Seven extended blowdown test runs were conducted and are identified as Test Run Numbers 69 to 75 inclusive. Quencher C was used for Test Run Numbers 70, 71, 73, 74, and 75, and quencher G was used for Test Run Numbers 69 and 72.

Prior to each test run, steps were taken to bring the pool into thermal equilibrium. Following each extended blowdown test, the pool was mixed and cooled via a combination of RHR trains A and B and the LPCS system operated in the test mode. A minimum of one hour was allowed between the time the systems were shut off and the start of the next test to allow the pool to become quiescent. The time between extended blowdown test runs ranged between four and seven hours.

Data recording was started 15 seconds before the start of each test run and continued for approximately 80 minutes.

At time zero the designated S/RV was opened. For the tests which included RHR operation (69 and 72), the RHR system train A was started in the pool cooling mode immediately following the opening of the "G" S/RV. Table 2-1 presents some pertinent information for each of the extended blowdown test runs. Figure 2-1 shows the azimuth of the RHR train A suction (32 ) and discharge (163 ).

2-1

TABLE 2-1 TEST CONDITIONS Elapsed Time Reactor Reactor Run S/RV S/RV Test since previous Power Pressure No. Date Open Close Duration Test (%FP) (psia) 69 12/28/82 13:41:55 13:56:56 15:01 2:25:43 47 958-961 70 12/28/82 17:49:57 18:06:58 17:01 3:53:01 46 957-961 71 12/29/83 00:49:53 01:04:19 14:26 6:42:55 46 954-956 72 12/29/83 05:03:52 05:18:57 15:05 3:59:33 46 953-958 73 12/29/82 10:17:53 10:30:45 12:52 4:58:56 46 954-957 74 12/29/82 15:22:51 15:32:24 9:33* 4:52:06 48 953-957 75 12/29/83 19:37:52 19:50:53 13:01 4:05:28 51 956-958

• Extended blowdown stopped due to faulty reading on suppression pool level indication.

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2-3

l 3.0 INSTRUMENTATION 3.1 PE RMANENT INSTRUMENTATION (SPTMS) the suppression pool temperature monitoring system (SPTMS) monitors the pool temperature to provide the operator with the information necessary to prevent excessive pool tempera-tures during a transient or accident. Temperatures in the pool are recorded and alarmed in the main control room.

The instrumentation arrangement in the suppression pool consists of two wall mounted sensors and 14 dual-element SPTMS temperature sensors mounted on support structures near the surface of the suppression pool between adjacent T-Quenchers.

The two wall mounted temperature sensors are dual-element chromel constantan thermocouples located at elevation 683 feet 0 inch, and at azimuths 17 and 197 . Signals from these sensors are used to provide the operator with a general indication of the pool temperature. They are not used in conjunction with any specified or mandated operator action.

The SPTMS temperature sensors consist of 14 dual-element, 100 0, platinum RTD's located 8 inches below the low water level at elevation 698 feet 10 inches. Ten of the sensors are mounted near the outer suppression pool wall at azimuths 0 , 33 , 67 , 113 , 149 , 180 , 211 , 247 , 293 , and 332 .

The other four are mounted near the pedestal at azimuths 48 , 128 , 233 , and 308 . Seven of the dual-element RTD's are powered from the ESS-1 power division and seven are powered from the ESS-2 power division. During normal plant operation the SPTMS is in continuous operation recording the suppression pool water temperature in the main control 3-1

t Alarms in the control room provide the operatdr sufficient

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notice to take appropr:' ate action to prevent the pool from exceeding the specified temperature limits.

The Technical Specification operator action points are desig-nated TS1, TS 3, and TS4. Alarms are given hhen any one of the 28 sensor elements exceeds TS1 or.TS3. Use of the SPTMS to indicate bulk pool temperature is addressed in-Section 5.1.

Operator action point TS1 (currently 100 F) is the point at which the operator is to start pool cooling.

Operator action point TS3 (currently 110 F) is the point at which the operator is to scram the reactor.

Operator action point TS4 (currently 120 F) is the point at which the operator is to start depressurization of the reactor.

3.2 TEST INSTRUMENTATION Th ir ty-f ou r (34) temperature sensors werc used in the extended blowdown test to measure the suppression pool temperature.i The Medtherm PTF-100-10356 was used at all 34 ' locations..

The locations of these sensors are shown -in Figures 3-1 and 3-2 and described in more detail in the "In-Plant S/RV-Test Plan" [1] and the "In-Plant S/RV Test Final Data Report"

[6]. These sensors have a stated accuracy of +0.5 P and a thermal response time of 5 ms [6].

The temperature sensors were conditioned with the AGM Electronic,

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Inc. Model EIA-4003 RTD Signal Conditioner. This device.

provides a filtered, regulated, rectified pow'er supply to' individual RTD's. The EIA-4003 amplifies, linearizes,'and isolates the output signal from the RTD and provides art output signal to the data acquisition system ( the O'. S . I '.

Model 721) .

Sensors T6 and T12 were non-functional for all test runs.

3-2 3

3.3 DATA ACQUISITION The digital data acquisition and recording system was the Q.S.I. Model 721. A block diagram of this system along with the other Data Acquisition, Recording and Playback System (DARPS) equipment is given in the "In-Plant S/RV Test Plan" [1] .

All signal inputs to the system are processed, formatted, and written in IBM compatible form on digital magnetic tape.

The tapes so generated may then be processed on any computer system (supporting industry standard magnetic tapes) for data reduction, analysis, and reformatting to any desired standard.

Internally, the test measuring equipment was grouped into four main subsystems: (1) an analog multiplexer; (2) a prec ision analog-to-diaital conver ter ; (3) a high speed digital magnetic tape recorder; and (4) an electronic control logic.

Several f actors contributed to the high accuracy and high throughput of this system. The analog-to-digital converter was a orecision, 12-bit (11 bits plus sign) unit, with crystal referenced sampling rate. The resulting low sample interval jitter eliminates the wow and flutter problems of analog recorders. The digital magnetic tape unit was a high-speed (125 ips) , very high density (6250 BPI Group Code Recording GCR ) device. This enabled an extremely high data through-put for the system. The GCR technique provided for a very low error rate by correcting any recording errors on-the-fly. Finally, semi-conductor memory was used to buffer data flow through the system. This allowed data acquisition and recording functions to proceed independently, for the highest possible system throughput (up to k million samples /

sec.). On-the-spot playback of recorded data, with recon-version to analog form, was also a feature of this system.

3-3

3.4 DATA REDUCTION The general purpose Wyle computer program ADARS was used to perform'the required data processing. ADARS provided the framework for coordinating varioun data files on disc.

ADARS had an operator interface which allowed the user to select a wide variety of processing and display options to meet his analysis requirements.

ADARS performed all necessary data reduction to produce the output analysis plots. The major tasks involved in this process included: building a data base of pertinent channel information, demultiplexing the digitized data, conversion of the data to the proper engineering units and prodecing the analysis plots.

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TEMPERATURE SENSOR LOCATION AND ZONE MAP FOR SUPPRESSION POOL - ELEVATION VIEW FIGURE 3-2 3-6

4.0 DISCUSSION OF RESULTS 4.1 BULK POOL TEMPERATURE The initial and final bulk pool temperature for each test run were obtained by computing the weighted average of test sensor readings (" sensor weighted average" or s.w.a. method).

The suppression pool was extensively instrumented with 34 temperature sensors (see Section 3-2). Two of these sensors failed prior to the start of the tests and the remaining 32 sensors were used in calcalating the s.w.a. bulk pool temperature. Table 4-1 presents the results of these calcu-lations as well as the blowdown duration for each test run i

and the average rate of bulk pool temperature rise during the blowdown portion of each test run.

J An alternate and independent methed of compating the final

, bulk pocl temperature was used for comparison to the " sensor weighted average" method. A macG-energy calance methol wac used which included the idealizaticn that the pool acted as an inothermal heat sink. Mass-energy addition to the pool was from the discharging quencher and was determined using main steamline mass flow rate and reactor pressure

! data. Energy removal from the pool was via operation of the RHR system train A. Heat losses to submerged structures and suppression pool walls are negligible and were not included in the model. These two methods (s.w.a. and mass-energy i

balance) were compared and found to be in good agreement.

The pool temperature rise computed using the mass-energy balance method ranged between -2.8% and +6.7% of that computed using the " sensor weighted average" method.

i Appendix A presents the details of all bulk pool temperature calculations.

4-1

~4.2 LOCAL TO BULK POOL TEMPERATURE DIFFERENCE The local-to-bulk pool temperature d! f f erence is the dif f erence between the local pool temperature and the bulk pool temperature at any time during the S/RV discharge. The local pool temper-ature is defined as the average water temperature in the vicinity of the discharge device and represents the tempera-3 ture which controls the condensation process occurring at the quencher exit [23 .

Because the quencher discharge is predominantly in the hori-zontal direction, the induced flow pattern is such that the water supplying the quencher front comes from above and below the quencher. Therefore, the local pool temper-ature is considered to be that indicated by the sensors located immediately above and below the quenchers [2 ].

The temperature sensors used to determine the local pool temperature for the tests were located directly above and below the gaencher arras of the discharging quenchers. Sensors T4 and T32 were uced (see Figures 3-1 and 3-2 for sensor locations) for the quencher G discharge cases (Runs 69, 72). Sensors T2 and T33 were used for the quencher C dis-charge cases (Runs 70, 71, 73, 74, 75).

Sensors T2 and T4 were mounted 41 inches directly below the "C" and "G" quencher arms, respectively. Sensors T32 and T33 were mounted on the "G" and "C" S/RV discharge lines, respec tively, 25 inches above the quencher hubs.

Figures C-1 to C-7 show the recorded temperature traces for the local pool temperature sensors; the s.w.a. hulk pool temperature is drawn in for comparison. As shown on the plots, the recorded temperatures fluctuated due to local flow perturbations. These fluctuations represent local mixing of hot and cold regions. The temperature controlling the conden-sation process is the spatial average of the temperatures around the quench front. It was not practical to extensively 4-2

instrument the region near the quench front. These hot and cold regions are not fixed in space but move during the transient driven by local bouyancy eff ects.

Examination of Fiqures C-1 to C-7 shows the local-to-bulk pool temperature difference to be a stationary random variable; that is, the average value is constant (or relatively constant) with time. Because the temperature sensors used to measure the local pool temperature were mounted in the inflow region to the quencher and because the local pool temperature is a stationary random variable, the spatial averaging of the local temperature field can be replaced by temporal averaging at single sensor locations, i

The local-to-bulk pool temperature dif f erence was determined as the temporal average of the instantaneous local-to-Sulk pool

, temperature differences. This temporal average was obtained by numerically integrating the difference between the individual test sensor reading:5 and the time depcadent s.w.a. bulk pool temparature. The local-to-Sulk pool temperature difference depends upon the limits of this integration. The natural upper limit for the integration is the time of S/RV closure.

However, it is not necessarily appropriate to take the time of S/RV opening as the lower limit of the integration because at this time the local-to-bulk pool temperature dif ference is zero. To avoid the problem of determining an approoriate lower limit for the integration, this limit was considered to be variable.

Thus a number of integrations of the local-to-bulk pool temperature difference were calculated for each sensor using l

l a variable lower limit of integration and an upper limit as the time of S/RV closure. The lower limit of the integra-tions ranged between the time of S/RV opening and 4 minutes before the time of S/RV closure. The calculated local-to-bulk pool temperature difference for any particular sensor was taken as the maximum of these different integrations.

4-3 l

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Table 4-2 presents the calculated local-to-bulk pool temperature differences for each sensor for each of the test runs.

The maximum observed local-to-bulk pool temperature dif ference of 9.1 F was calculated for the quencher G discharge (Test Run 69) (with RHR cooling) for basemat sensor T4. The average local-to-bulk pool temperature difference for the G quencher runs was 8.1 F and the 95/95 confidence level of non-exceedance temperature was calculated to be 12.0 F. The average local-to-bulk pool temperature difference for the C quench 0( runs was 6.6 F and the 95/95 confidence level of non-exceedance temperature was calculated to be 11.0 F.

In calculating the local-to-bulk pool temperature difference, the local temperature sensors were corrected for individual bias. This bias is computed in Appendix A and ranges between

-0.76 F and +0.60 F for the sensors in question.

4.3 SUPPRESSION POOL TEMPERATURE _ MONITORING SYSTEM (SPTMS) RESPONSE SPTMS temperature readings were recorded on a pair of point recorders during each of the seven extended blowdown test runs.

These readings were tabulated for selected times during the test. The tabulated temperatures were plotted for positions of relative azimuth (to the discharge quencher) and compared with the corresponding s.w.a. bulk pool temperature for times 0, 4, 8 minutes and final time into the blowdown transient.

These results are presented in Figures C-8 through C-14 for each SPTMS division. Temperature readings indicated by the permanent temperature monitoring system were found to be always higher than the s.w.a. bulk pool temperature for all sensors and for all test runs. Table 4-3 lists the temperature difference between the minimum and the maximum of the SPTMS temperature readings and the s.w.a. bulk pool temperature at different times for all the runs.

It was observed that an increase in pool temperature strati-fication occurred during the S/RV discharge. This stratifi-cation supports the above observation that the SPTMS sensors, 4-4

which are mounted near the pool sur f ace , read higher than the bulk pool temperature. Figure 4-1 shows the response of the SPTMS to thermal stratification during the test runs.

This figure shows three measures of near surface pool strati-fication. One is the average of the SPTMS readings minus the s.w.a. bulk pool temperature for various times during the transient. The other two are the maximum and minimum SPTMS readings minus the s.w.a. bulk pool temperature, thus giving a bound on this stratification. The SPTMS exhibited a temperature dependent bias relative to the test sensors (up to 6 F, see Section 4.4) and the SPTMS readings have been corrected for this bias in this figure. The sensors have also been corrected for the individual variation exhibited in a uniform temperature pool.

4.4 GENERAL OBSERVATIONS, Pool Mixing The buoyancy induced mixing in the pool was found to be vigorous and extensive. After an initial time period (of less than 5 minutes) during which the flow rield develops, the temperature rise rate is uniform throughout the pool.

This is demonstrated by Figure 4-2. This figure plots the temperature response of sensors T3, T31, and T48 for Test Run 71. Sensor T3 is a sensor mounted on the basemat, 17 feet f rom the discharging quencher, while sensor T48 is a sensor mounted on the outer cool boundary within 1 foot of the pool surface, 23 feet from the quencher. Sensor T31 is the farthest sensor from the discharging quencher (75 feet). This sensor is mounted on the outer pool boundary just under halfway up from the basemat to the pool surface.

The parallel slope of the temperature response of this sensor to those of the other two sensors shows lateral stratification after the initial flow field develons. Also shown on the plot is the s.w.a. bulk pool temperature. This type of response (uniform temperature rise rate after an initial period) is typical of all sensgrs and all teet runs.

4-5

RHR System Operation The effect of RHR system operation on the local-to-bulk pool temperature difference cannot be determined f rom these tests. However, the influence of RHR operation on measured local-to-bulk pool temperature differences is inferred to be negligible due to 1) the relative location of the dis-charging quencher and the RHR discharge and 2) the small amount of mixing produced by RHR operation (throughput is less than 0.8% of pool volume / minute).

Local-to-Bulk Pool Temperature Dif f erence, The measured local-to-bulk pool temperature difference was determined for high steam flux and low bulk pool temperature conditions. This local-to-bulk temperature difference is of importance at low steam flux and high cool temperature conditions. Under either of these conditions, the expected local-to-bulk pool temperature dif ference is lower (see Appendix B) than for test conditions. Thus the local-to-bulk pool temperature dif f erence determined from the test can be conservatively applied to determine the maximum local pool temperature.

SPTMS Versus Test Sensor Bias Examination of the temperature readings from the SPTMS and test sensors indicated a bias between the two systems.

This bias was evaluated by comparing the average of the 28 SPTMS sensor element readings to the reading from test sensor T48 at the start of each test run. (The elevation of T48 is within 2 inches of the elevation of the SPTMS sensors.) The initial temperature conditions in the pool were uniform azimuthally (see Appendix A), making data from l this portion of the transient applicable as a measure of this bias. The bias (i.e., SPTMS average reading minus T48 reading) was found to be well correlated with the reading from T48 (i.e., with temperature) and the linear regression correlation coefficient of this data was -0.953. The points f rom the seven test runs are plotted on Figure s -3. Also shown on the~ figure is the bias between the six closest 4-6

SPTMS sensors and T48 at the time of S/RV closure for each of the seven test runs. (Figure 4-4 shows the locations of these six closest SPTMS sensors and of T48) . These data points are not as well correlated as those for the initial conditions and this is to be expected. The pool is not in equillibrium at the time of S/RV closure and the pool temperature is not uniform azimuthally. This most probably accounts for the scatter in these data points.

In presenting the response of the SPTMS (see Tables 4-3, 6-1, Figures C-8 ta C-14) the raw data from the SPTMS was compared to the s.w.a. bulk pool temperature without correlation for the bias between the SPTMS and test sensors. However, above 100 F the indicated bias between the two systems is less than 2 F. Thus all conclusions about the adequacy of the SPTMS are valid even accounting for the indicated bias between the two systems.

In presenting the response of the SPTMS to thermal pool stratification during the test runs (Figure 4-1), a correction was made for the bias between the SPTMS and the test sensor based upon the linear regression analysis of the data taken from the start of each test run. Thus the stratification shown is a true measure of the actual stratification near the pool surface.

4-7

TABLE 4-1 S.W.A. BULK POOL TEMPERATURE +

G-Quencher I C-Quench _er Run No. _

69 72 _ _70 71 73 74 75 Initial Temperature 58.9 76.4 61.6 66.5 71.0 72.5 74.9 (gF)

Final Tgmperature 78.4 95.9 86.4 87.6 89.4 86.4 94.0

( F)

Blowdown Duration 15:01 15:05 17:01 14:26 12:52 9:33 13:01 (min:sec)

Average Rate of 1.30 1.29 1.46 1.46 1.43 1.46 1.47 Bulk Pool Tempgrature Rise

( F/ min)

+ Initial Pool Mass - 8 039 x 106 lbm +0.4%

I One RHR in pool cooling mode during G-Quencher runs.

l l.

4-8 I

l.- - - - -

TABLE 4-2 LOCAL-TO-BULK POOL TEMPERATURE DIFFERENCE G QUENCHER RUNS (with RHR)

Sensgr Sensog Run No. T4 ( F) T32 ( F) 69 9.1 8.3 72 7.3 7.9 C QUEMdHER RUNS (without RHR)

Sensgr Sensog Run No. T2 ( F) T33 ( F) 70 2.7 6.3 71 7.7 7.7 73 8.1 7.2 74 6.9 6.5 75 5.8 7.1

SUMMARY

Local-to-Bulk Pool Temperature Difference (OF)

Test Maximum Type Average Observed 95/95 C Quencher 6.6 8.1 11.0 G Quencher 8.1 9.1 12.0 1

4-9

.(.

I 4

TABLE 4-3 '

RANGE OF SPTMS SENSOR READINGS ABOVE S.W.A. BULK POOL TEMPERATURE (*F) _

Run Quencher No. t = 0 min t = 2 min 2 t = 4 min t = 8 min t=t g Tb'E ___

G 69 6.2/10.7 3.7/13.4 6.4 /14.7 6.6/15.5 7.0/14.2 4

72 5.0/9.2 3.0/12.2 77.1 4.3/13.4 S.9/12.1 4.7/13.6 95.8

! C 70 6.2/10.9 71 5.3/13.0 5.1/14.7 4.5/14.6 5.3/14.1 83.5 4 6.6/10.4 4.7/11.1 3.7/12.3 4.2/14.2 3.8/13.4 87.0 73 5.1/8.6 2.3/9.5 2.1/12.9 3.9/12.9 4.1/13.2 88.2

! 74 5.0/8.8 2.4/10.5  :

I 75 3.1/13.0 2.8/12.3 2.2/12.4 87.1 8.2/12.0 5.7/11.2 4.2/13.8 3.4/12.8 3.1/12.9 94.0 J' ,

4 g i I

! 5

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4-15

.1

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5.0 EVALUATION OF SPTMS OPERATION AND TECHNICAL SPECIFICATIONS The technical bases for using the SPTMS to indicate bulk pool temperature and the technical specifications concerned with suppression pool operability were developed based upon generic data with built-in conservativeness to allow for differences between the test conditions under which this generic data was derived and actual plant conditions at the LaSalle County Station. Results from the extended blow-down tests provide a plant unique data base ~with which to quantify these conservatisms and examine the use of the SPTMS to indicate bulk pool temperature. They also provide the opportunity to develop more realistic technical specifi-cation limits and procedures for using the SPTMS which allo.e for a wider range of plant operability,

There are six places in the Technical Specifications 4 which refer to SPTMS and supptension pool operability and they are found in:

(1) Table 3.3.7.5-1, page 3/4 3-70, Item 4 (2) Section 4.5.3.1 (b), page 3/4 5-9 (3) Section 3.6.2.1 (2), page 3/4 6-16 (4) Section 3.6.2.1, action (c), page 3/4 6-17 (5) Section 3.6.2.1, action (d), page 3/4 6-17 (6) Section 4.6.2.1, page 3/4 6-17 and 6-18 Part 5.1 of this sec'cion examines the use of the SPTMS to indicate bulk pool temperature and also addresses items

, (1), (4), (5), and (6).

Part 5.2 of this section examines the suppression pool limits for temperature and water level and addresses items (2),

(3), and (6).

5-1

5.1 SPTMS OPERATION The SPTMS is designed to provide plant operators with a measure of the bulk pool temperature for the purposes of ensuring that the plant is maintained within the established temperature limits for suppression pool operability. The sensor elements of the SPTMS were conservatively installed within 1 ft. of the pool surface so that the majority of sensors would always read marginally higher than the bulk pool temperature (due to thermal stratification in the pool).

As discussed in Section 6.3, the current procedure for using the SPTMS to indicate Sulk pool temperature is very conser-vative. This section examines alternative methods of using the system under which plant operability can be imntove6.

The bulk pool temperature indication from the SPTMS may be different than the actual bulk pool temperature due to a number of factors. These factors have been grouped into four categories which are discussed below:

(1) overall SPTMS system bias, (2) variation amongst sensors due to calibration errors and drift, (3) thermal stratification in the pool, and (4) the procedure for combining individual sensor readings to indicate bulk pool temperature.

Overall SPTMS System Bias An overall system bias was observed between the SPTMS and the Wyle installed test sensors (see Figure 4-3). This bias was temperature dependent and ranged linearly between

+6 F at 60 F to +1.5 F at 100 F. The Wyle temperature sensors are believed to provid'e a more accurate measure of pool temperature due to the comprehensive calibration orocedure used to ensure data accuracy [6 ]. This procedure included calibrating the integrated unit of temperature sensor and signal conditioning device at three temoeratures 5-2

over the range of test conditions thus eliminating inaccuracies due to individual component variations. Individual test sensors were also found to exhibit almost no drift from test to test (0.1 F, see Appendix A).

On the other hand, the calibration procedure for the SPTMS is less rigorous. Individual sensor elements were vendor certified to industry standard tolerance. The portion of signal loop f rom the input to the signal conditioner through to the point recorder is periodically calibrated. However, without any integrated calibration test from SPTMS sensor element through point recorder, there is an insufficient data base upon which to account for this indicated system bias in using the SPTMS. It should be noted that the in-dicated bias over the range of interest (100 F to 120 F) is snsall (<2 F). .

Individual Sensor var _tatipn Individual sensors were found to exhibit variation in a uniform temperature (a imuthally) pool. The standard deviation of this variaticn from the mean was 1.3 F. The easiest method of treating individual sensor variation is to separate it from the other three f actors (i.e., system bias, stratifi-cation, and procedure) and to simply allow for a certain amount of individual sensor variation in setting pool temper-ature limits. The allowance considered in this report for individual sensor variation in setting suppression pool temperature limits is 4 F.

Thermal Stratification The SPTMS readings are expected to be higher than the bulk pool temperature due to thermal stratification within the pool (See Figure 4.1). To examine this effect in detail,

consideration must be given to the process which is causing the pool temperature to rise. The pool temperature rise can be caused by either chronic or acute conditions and 5-3

the required response time to these conditions is very different.

Chronic heatup conditions are factors which act over long periods of time and cause the pool temperature to rise very slowly (< 3 F/hr ) . Examples of these conditions are 1.) pool heatup due to heat transfer from the reactor building and drywell and 2) heatup due to leaky S/RV's. It is the nature of these conditions that they gradually develop over time making plant operators cognizant of these conditions thus allowing special procedures to be instituted (e.g. periodic EHR operation) which will prevent pool temperatures from exceeding the temperature limits. The distributed nature of these pool heatup sources would result in much less strati-fication than for acute hentup events. Thermal str atifi-cation for chronic heatup conditions was not measured and thus no credit can be taken for adjusting the SPTMS bulk pool temperature indication for pool stratification. However, pli:nt operators have many options for saintaining the pool within operable tcuperature limits under chronic heatup conditions (e.g. RHR and LPOS (test nade) operation).

Acute pool heatup conditions include such events as small break LOCA and inadvertent actuation of an S/RV. Small break LOCA conditions are not of interest here (reactor scram would be brought about by other than a high pool temper-ature signal) and thus only inadvertent actuation of an S/RV will be addressed. Under this event, the pool temper-ature rise rate is large (2 0F/ min) as is the resultant thermal stratification.

Results from the test data show that despite the best efforts of the operators to thoroughly mix the pool before the start of each test, a stratification layer near the surface was i evident which was on average 3 P higher than the bulk pool temperature. Following actuation of an S/RV, this stratifi-cation increased, although it did not change significantly 5-4

in the first two minutes of the blowdown (<.5 F). The average temperature of the stratified surface layer above bulk pool temperature increased from an initial 3 F to; 4.5 F at 4 minutes, 6.2 F at 8 minutes, and 6.7 F at the t.ime of valve closure.

Pool stratification can be indirectly factored-i.n to the bulk pool temperature indication by selecting an appropriate procedure for the use of the SPTMS.

f Procedure for Using the SPTMS As discussed in Section 6.3, the c,riginal method of usino

, the SPTMS to Indicate bulk pool temcerature for the purpose of taking operator action was purposefully conservative.

Test data row provide a basis upon which to develo? more realistic procedures for using the SPTMS ~co indicate bulk pool temperature. The test data also allow exanination of a hypothetically degraded SPTMS by interpreting the data i

with the asautcptica that certain sensor elements are inoperative.

1 To de'!elop workable methods for using the SPTMS to indicate bulk pool temperature, the response of the system relative to the bulk pool temperature during S/RV discharge was examined.

Figures C-15 to C-21 show the response of the SPTMS at 0, 2, 4, and 8 minutes into the blowdown with corrections made

, to the raw SPTMS data for overall system bias (see Figure 4

4-3) and individual sensor variation (in order to eliminate extraneous factors). From these plots, the number of sensor locations per division which have at least one sensor element reading below bulk pool temperature has been determined and tabulated in Table 5-1. Results show that no more than one location per division had sensor elements reading below bulk pool temperature except at 2 minutes into the blowdown.

All of the SPTMS sensor elements which read below the bulk pool temperature at 2 minutes were within 1 F of- the bulk l

5-5

- w. , , , ,, m r w . - - - , . - - - - - . w -..e.-r w n-sw- . , - ..,,_.r , ,-,.---,-.-,--wr-.c.,-. ,e ,, , ,-, - ....-. - + -v.-w---

pool temperature. Taking this into consideration, provided the available margin on the technical specification pool temperature limits is more than 1 F, for oractical purposes no more than 1 sensor location per division need be considered to read below the bulk pool temperature. Thus, a conclusion is made that a conservative measure of bulk pool tempera-ture- is provided from any 2 sensor locations per division with only one operative sensor element per location (for a total of 4 sensor elements in the pool).

From the derived data presented in Figures C-35 to C-2'.,

wh ich show no more than 1 senso location per divieron to have at least one sensor element reading more than '_ P helow the bulk pool temperature, an alternative nernod of ecThininq SPTMS reading 3 for ccmparison to operator action pointi 2 can be proposed. This method would dictate that a specific action be carried out only when all sensor locations but 1 per division have sensor elements which read above tne ,

temperature limit for the action. The Operators' tost in per fort.ing this procedure coul-! be f acilitated by ha > i:n  ;

bold lines printed on the SPTMS point recorder strip charts ,

at the technical specification temperature limits (TS1, TS3, TS4).

The sections of the Technical Specifications 4 concerned with SPTMS operation are discussed below.

(1) Table 3.3.7.5-1, Page 3/4 3-70, Item 4 This technical specification states that in order for a division of the SPTMS to be termed " OPERABLE", all seven channels must be working with at least 1 sensor / '

well. This requirement is more stringent that necessary After considering a 4 0 F margin for SPTMS calibration and drift errors.

5-6

and, as established herein, no more than 2 working chann41s per division (not in the same sensor well) are required to provide a conservative measure of Sulk pool temperature.

(4) Section 3.6.2.1, Action (c), Page 3/4 6-17 This specification requires that "with one suppression pool water temperature instrumentation division inoperable, restore the inoperable instrumentation to OPERABLE status within 7 days".. . " with the final requirements determined after demonstration of correlation of pool bulk temperature as measured by each division to pool bulk temperature as measured by both divisions." Table 5-2 presents a comparison of Stilk pool tepperature as measured by each division to the temperatare as measured by both divisions for a hypothetically 4tqtaded SPTMS. This degraded SPTMS considers the highest reading sensor element from each sensor location to be inepara-tive and additionally that of the remaining seven sensor elements from each division, the four highest reading sensor elements are considered inoperative. It is concluded that even in this degraded condition, either division can provide a conservative measure of bulk pool temperature and thus either division is sufficient for indicating bulk pool temperature. The actual time requirements for restoring the inoperable, redundant instrument division is not within the scope of this report; however, it has been established that temper a-ture indications from two pool locations in either division can adequately represent bulk pool temperature and hence the definition of an operable SPTMS division should be based upon having at least two operable sensor locations within the division. i 5-7

(5) Section 3.6.2.1, Action (d), Page 3/4 6-17 This specification requires "uith both suppression pool water temperature 4.nstrumentation divisions inoperable, restore at least one inoperable... water temperature division to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. . . " . Results of the tests (Table 5-2) have shown either division of the SPTMS to provide a conservative measure of bulk pool temperature and thus this requirement does not require change based upon the extended blowdown test (i.e. no more than one division need be restored in

the allotted time).

(6) Section 4.6.2.1, Page 3/4_6-17 and 6-18 This action covers general surveillance requirements for suppression chamber OPERABILITY. Paragraph C reauires .

all fourteen suppression pool water temperature instri:-

mentation channels to be OPERABLE by performance of l

~

channel checks, fundtional tests, and channsi calibra-tion. As established previously in this rection, a minimum of two OPERABLE channels in a division are sufficient to conservatively indicate bulk pool temperature.

5.2 TECHNICAL SPECIFICATIONS A part of the restrictions on suppression pool operability are maximum temperature and minimum water level. Using data from the extended blowdown tests, an examination of those restrictions is made here.

4 4

The operator action points for suppression pool temperature are designated TS1, TS3, and TS4 (see Section 3.1) and are currently set to 100 0F, 110 F and 120 F respectively. A parametric study of the six bounding suppression pool transients identified in NUREG-0783 [2] was per formed to examine the margin built-in to these operator action points. This studv examined the effect of varying these operator action points on the ultimate pool temperature. Results of the study are detailed in Table 5-3 and shown in Figure 5-1.

5-8

i Figure 5-1 shows the margin between the local pool temperature and the local pool temperature bound as a function of time for the three parametric cases. Each parametric case consists of the six bounding transients defined in NUREG-0783[2]

and each curve on Figure 5-1 shows the lower bound of the temperature margin for each of the six cases of one of the parametric cases. As indicated on the figure, different scenarios are bounding at various times following reactor scram. This figure shows the minimum temperature margin to occur at the end of each of the parametric cases.

t Table 5-3 presents the input operator action noints for the study and shows the temperature margin between the maximum local pool temperature and the local pool temperature bound (as determi ned f rom NUREG-0783 [2 3) . The local pool tempeta-ture was obtained by adding 12 0F t to the calculated bult pool temperature to account for tSe local-to-bulk pool temper-ature difference. Operator actions at technical specifi- '

cation action points 4cte acsumed to occur 4 0P above the set points ta allow for SPTMS calibration and drift errorn.

As shown by case 3, the margin in the current technical specification operator action points (TS 1, TS 3, TS 4 ) is found to be 20 F for S/RV discharge phenomena.

There are many considerations involved in establishing the Technical Specification operator action points on suppression pool temperature. Ultimately, the setpoints must be soundly established to ensure that the maximum local pool temperature does not exceed the NRC dictated local pool temperature bound. Figure 5-2 presents the constituents which make-up the bounding local pool temperature for the three para-metric cases of operator action points summarized in Table t

See Section 4.2.

5-9

. _ . .. _. _- , . _ . _ , . _ _ _ _ . _ - _ . ~ _ _ _ _ _ ___- . _ - - . _ - . _ . . - . _ - . _ -

5-1. These constituents include allowance for instrument calibration and drift errors, temperature rise during design basis transients, and the local-to-bulk pool temperature difference.

The minimum water level in the suppression pool is deter-mined by more than just considerations of S/RV transients.

However, a minimum level can be calculated for S/RV discharge phenomena (i.e. the six transients of NUREG-0783[23). This levc1 is computed by using the final pool temperature margirs ir. Table 5-3 and reducing the initial pool mass Sy the required amount to result in a margin of 0 F for each of the three parametric cases. This computation also involvca recomoutino the local pool temoeratare bound (as it decreases with da-creasing poni weber level) . Details of these calculations are rot presented here but the results for mininum pral watet level nre included in Table 5-3.

The sections of the Technical Specifications [4] concerned with pool temperature limits and minimum water level are discussed below.

(2) Section 4.5.3.1 (b), page 3/4 5-9 This technical specification requires the low suppression pool water level alarm setpoint to be " greater than or equal to 26'4"... with the final setpoint determined based upon results of the startuo test program. The pool water level of 26'24" was used in determining the initial pool water mass for use in suppression pool temperature transient studies. While this level depends upon more than just S/RV discharge phenomena (e.g. LOCA), the limit for this phenomena could be much lower depending upon TS1, TS3, and TS4 (see Table 5-3).

5-1.0

(3 ) -Section 3.6.2.1 (a), page 3/4 6 1.6 This specification requires that for the suppression chamber to be OPERABLE "the pool water volume ...

a l shall be ... between 131,900 ft-1 and 128,800 ft3, equiva-lent to a level between 26 '10" and 26 ' 2\", to be veri-fled by results from the S/RV testing program. These test results only have an effect on the minimum water

~

volume and as discussed in the previous paragraph, this volume is . sufficient but could be less for S/RV discharge phenomena (see Table 5-3).

1

~

.{ Section 3.6.2.1.a.2 gives the specification for the operator action points on suppression pool temperature.

! As discussed previously, the current setpoints have a 20 F margin for S/RV discharge phenomena.

d (6)- Section 4.6.2.1, page 3/4 6 17 and 6-18 This section of the technical specifications details the surveillance requirements for suppression chamber

{

OPERABILITY and includes references to TS1, TS3, and

TS 4. Test results show these operator action points

to be conservative.

k t

t I

2 5-11

. _ . _ _. . - _ . - .. , . . . _ . _ . _ . _ . _ , _ . - _ . _ _ . _ . - - . . - ~ - _ _ .., _ . _ . - - - . _ - . .

TABLE 5-1 SPTMS Locations Reading Below Bulk Pool Temoerature Run Number Time into (Division 1[ Division 2)

Transient (min) _69_ 70 71 72 73 74 __ _7_ _5 0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 2 2/2 0/0 0/0 0/0 2/2 1/4 0/0 4 0/0 0/0 1/0 0/0 1/1 1/0 0/0 8 0/0 0/0 0/0 0/0 0/0 0/0 0/0 tg 0/0 0/0 0/0 0/0 0/0 0/0 0/0 This table shows the number of SPTMS locations for each division where at least 1 sensor element reads below the s,w.a. bulk pool temperature for various times during the blowdown transient. The SPTMS sensor readings have been corrected for both system bias and individual sensor variation.

t is 14, 15, 14, 15, 12, 10, and 1.3 minutes for the runs listed ,

rbspectively.

5-12

_ _ - , . , , m . _ , _ , _ .- _- .-

/

TABLE 5-2 COMPARISON OF THE DEGRADED SPTMS DIVISIONS (Indicated Bulk Pool Temperature , F)

C Time Since S/RV Actuation test Run No. O min 4 min 8 min t=t g I

Run No. 69 Both Divisions 65.5 71.8 79.5 86.4 D iv . 1/D iv . 2 65.5/66.3 72.5/71.8 79.5/79.9 86.4/87.5 s.w.a. Bulk 58.9 64.1 69.3 77.1 Run No. 70 Both Divisions 68.9 70.9 80.6 90.0 Div. 1/Div. 2 68.9/69.6 74.4/70.9 80.6/81.4 91.5/90.0 S.W.A. Bulk 61.6 67.4 73.3 83.5 Run No. 71 Both Divisions 73.4 77.5 84.1 92.6 Div. 1/Div. 2 73.4/74.3 77.8/77.5 84.1/84.9 93.3/92.6 S.W.A. Bulk 66.5 72.3 78.2 87.0 Run No. 72 Both Divisions 82.3 88.8 94.4 102.5 Div. 1/Div. 2 82.3/82.9 88.8/89.0 94.4/95.1 102.5/103.0 S.W.A. Bulk 76.4 81.6 86.7 95.8 Run No. 73 Both Divisions 76.6 80.4 88.9 94.4 Div. 1/Div. 2 76.8/76.6 81.3/80.4 90.0/88.9 95.0/94.4 S.W.A. Bulk 71.0 76.7 82.4 88.2 Run No. 74 Both Divisions 78.1 82.0 90.0 92.8 Div. 1/Div. 2 78.4/78.1 83.6/82.0 90.5/90.0 93.3/92.8 S.W.A. Bulk 72.5 78.3 84.1 87.1 Run No. 75 Both Divisions 84.0 85.5 92.5 98.9 Div. 1/Div. 2 84.8/84.0 86.6/85.5 92.5/92.9 99.6/98.9 S.W.A. Bulk 74.9 80.8 86.6 94.0 t For a description of the hypothetical " Degraded SPTMS" see Section 5.1.

1) t g is 14, 15, 14, 15, 12, 10, and 13 minutes for the runs listed.

2) s.w.a. bulk is sensor weighted average temperature at time t.

5-13

TABLE 5-3 Parametric Study of Technical Specification Limits on Suppression Chamber Operability Final Minimum Parametric Tg1 Tg3 Tg4 Ma59 " 1

"*tertt Ca_s_e_ _

_ _1_Fl

_ __1 F) _1_F) _ ( F) Level 1 100 110 120 13.5 23'7" 2 110 120 130 6.9 24'9" 3 120 130 140 0.4 26'2" t

Current Operator Action Points ,

tt Current T.S. minimum level - 26'2 "

i 4

4 4

- 5-14

40. 5 DESCRIPTION h- Start of SO:tV ti Pouer as bounding transient h-Mass flux at quencher exit falls below 94 lbm/ft2 sec for SORV U power transient

~

, g

< 3) (h- Isolation-scram with I tilPt becomes bounding transient 30.- ly ({)-Mass flux at quencher exit falls below 94 lbm/ft 2 sec ts -

for isolation-scram transient g

w -

i h-Massfluxat quencher exit falls below 42 lb ,/ft 2 see g for isolation-scram t ransient h-Reactorisisolatedfromsuporessionpoolfor E

z h isolation-scram transient h-Endoftransient (See NUREG-0783 [2] for details)

Y5 20.-

v. y i m

/

I h TS1, TS3, TS4 I N E

/ CRSE 1 100, 110, 120 DEG F 5

r 10.- [ i l 1 CASE 2 110, 120, 130 DEG F '

1 i CRSE 3 120, 130, 140 DEG F

0. . . . . .

O. 1 2 3. 4. S. 6.

TINE FRON RERCTOR SCRRN (HOURS)

FIGURE 5-1: PRRANETRIC STUDY - SUPPRESSION POOL TEMPERATURE NRRGIN a

Case'1 Case 2 i Case 3 i

- 240 I

Saturatiorr-+  ;

236.5 g

- 236.5 , - 236.5 Temperature  ;

V< V< V4 l

T- 220 y 2 16.5 A

j t

- 216.5 yy - 216. 5 IV ,"

216. 1 IV i - 209.6 yyy r

' III

_. - - 204.1

- 200 h 203.0 {

, 777 '

- 19 7.6 r

{

' '21. 0 A

dl l 9

% t 180 o 4 4

• l c

a -

5 1

< <a II<

I hj -

160 g II<

o. .

"i "1  !

- 140 j  !

i l l

+

i fl 7j* - 124.0 p 120 - 120. 0 (TS1)

I<' 4

- 114.0 l - 110.0 (TS1) l- _ 104.0

- 100 Id- L _ 100. 0 (TS 1)

AT ( F)

Region Description Case 1 Case 2 Case 3 I Allowance for SPTMS calibration 4.0 4.0 4.0 and drift error II Temperature rise during 87.0 83.6 80.1 l NUREG-0783 [2] transients III 95/95 local-to-bulk pool 12.0 12.0 12.0

temperature difference IV Margin (Unaccoun ted) 13.5 6.9 0.4

( V NRC Safety Margin 20.0 20.0 20.0 i Figure 5-2

]

Anatomy of the Suppression Pool Temperature Limit iSee Table 5-1 5-16 l

6.0 COMPARISON OF RESULTS TO ACCEPTANCE CRITERI A This section compares test results to the current acceptance criteria concerning suppression pool temperature limits delineated in NUREG-0783[2]. These acceptance criteria involve the local pool temperature limit and the suppression pool temperature monitoring system (SPTMS) response. The current technical specifications concerning operator action points and the current administrative procedures for using the SPTMS to indicate bulk pool temperature were used in this compar ison. Section 5 of this report examines the margins built-in to the current technical specifications and proposes alternate methods of using the SPTMS to indicate bulk pool temperature. The portions of NUREG-0487[5] concerned with acceptance criteria for the SPTMS are also included in this section.

6.1 ACCEPTANCE CRITERIA Local Pool Temperature Historically, to meet the requirements of NUREG-0487 [5],

the LaSalle local pool temperature limit for licensing purposes was set equal to a constant of 200 F. However, by resolution of NRC Task Action Plan (TAP) 39, presented in NUREG-0783 [2 ],

this limit has been revised. Thus, the local pool temperature limit became a bounding local pool temperature which does not have a single value but rather is a function of plant conditions such as steam mass flux at the quencher exit and the amount of subcooling of suppression pool water near the steam quench front. For the LaSalle station this temper-ature bound ranges between 200 F and 216.5 F.

The acceptance criterion for local pool temperature is that the analytically derived local pool temperature (obtained using the methodology of NUREG-0783[2]) be marginally less than the local pool temperature bound at all times during each of the six design basis transients. This margin is 6-1 i

assignable to instrument drif t and error which is factored-in to the instrument setpoints.

Suppression Pool Temperature Monitoring System (SPTMS)

The acceptance criteria for the suppression pool temperature monitoring system (SPTMS) are given in NUREG's 0487[5] and 0783[2]. The specific criteria to which results from the extended blowdown tests were to be compared are as follows:

(1) "The total number of monitoring locations shall not be less than eight. Monitoring locations shall be distr ibuted evenly around the pool". (III .C. l.d2 of

[5 ])

(2) " Instrument setpoints for alarms shall be established so that the primary system can be shutdown and depres-surized" (III .C. l.d5 of [5]) ... without having the suppression pool exceed the temperature limit.

(3) "Each applicant or licensee shall demonstrate adequacy of the number and distribution of pool temperature sensors to provide a reasonable measure of the bulk pool temperature". ( 5. 8 (1) of [2 ])

(4) "... operating procedures...shall be used to minimize the actions required by the operator to determine bulk pool temperature". (5.8 (3) of [2 ])

(5) " Instrument setpoints for alarms shall be established so that the plant will operate within the suppression pool temperature limits discussed above". (5. 8 (4) of [2 ])

6.2 LOCAL POOL TEMPERATURE The basis for determining the maximum local pool temperature was a set of six S/RV discharge transients defined in NUREG-0783 [2 ]

and detailed in the LaSalle Design Assessment Report [3].

Analysis of these transients produced a set of time-dependent suppression pool temperature responses which depend upon the operator action points from the Technical Specifications [4].

6-2

These responses have been used to define a bulk pool temperature envelope for the six transients as a function t

of time. The resulting bounding temperature envelope is

presented in Figure 6-1. Also shown in this figure is the

! analytically derived local pool temperature envelope obtained i

by adding the 95/95 local-to-bulk pool temperature difference of'12 F-(determined from test data, see Section 4.2) to

'the bulk pool temperature envelope. The operator action points used in this analysis included a 4 F margin above those given in the Technical Specifications to allow for  :

SPTMS inaccuracies due to calibration error and drift.

The local pool temperature is defined as the spatial average

temperature in the vicinity of the discharge device. The

, bulk pool temperature is "the temperature calculated by plant transient analyses" [2]. The local-to-bulk pool temper-I ature difference is the temperature difference between the local and bulk pool temperatures. Figure 6-1 presents the maximum temperature envelope for both bulk and local pool '

temperature as a function of time and shows the bounding 4 local pool temperature as determined from analysis and measure-l ment to be below the local pool temperature bound throughout

i. the six limiting transients. Thus the acceptance criterion '

for the local pool temperature limit is met.

~ 6. 3 SUPPRESSION POOL TEMPERATURE MONITORING SYSTEM (SPTMS)

The SPTMS is described in Section 3.1. The first acceptance j criterion for the SPTMS is that the total number of monitoring l locations be at least eight. This criterion is met since

there is a total of 14 dual-element sensor locations in

{~ the suppression pool.

i Acceptance criterion (2) relates to instrument setpoints

and the bounding pool temperature. The criterion is met j for the current technical specifications as is demonstrated i by the analysis summarized in Figure 6-1. This figure shows l

f 5

6-3 w----e ,

~.,,,mw, . - - - -e e.w,,+,v-,-, ----,,-n-...,,,-.-,,n,,,,---, .-,n.,., mn,,-,,--- n ~, e,,-,,-,-...-n--,----,--vm,,,, -

the bounding 1ccal pool temperature to be 13.5 F below the local pool temperature bound. As shown in Section 5.2, there is a 20 F margin in the current operator action points on suppression pool temperature.

The current method for obtaining the bulk pool temperature indication from the SPTMS is to hand record individual sensor element readings from the point recorders and to then compute the arithmetic average of these readings. However, this method is only used for periodic surveillance of the suppression pool temperature. Action on technical specification set-points (based upon bulk pool temperature) is based upon a different procedure. Once alerted to a high temperature condition in the suppression pool (alarmed when any of the 28 sensor elements exceeds the setpoint), an operator closely monitors the point recorders and action is taken on a particular technical specification setpoint when a) any three sensor elements from either recorder exceed the setpoint and b) any one sensor element from the other recorder exceeds the setpoint [8 J.

To demonstrate the adequacy of this method for indicating bulk pool temperature for the purpose of taking action on technical specification setpoints, the " indicated" bulk t

pool temperature has been determined from the SPTMS test data. The difference between this " indicated" temperature and the bulk pool temperature as measured by test sensors is tabulated in Table 6-1. This difference is on the order of 12 F and is due primarily to thermal stratification within the pool (see Section 5.1 for a discussion of pool stratifi-cation). Thus acceptance criterion (2) is met as the proce-dure for using the SPTMS to take action on technical specifi-cation setpoints is conservative.

I Using the highest three sensor elements from one division and the highest sensor element from the other.

6-4

Acceptance criterion (3) requires the applicant to demon-strate the adequacy of the number and distribution of SPTMS sensors. Figures C-8 through C-14 present the readings for the SPTMS sensors at various times during each of the seven extended blowdown test runs. These figures show the response of the SPTMS to be fairly uniform for all sensors indicating good thermal mixing azimuthally around the pool (near the pool surface). For example, in Figure C-8B at 14 minutes into the transient, the data shows several sensors

~

to be within 2 F of the highest reading sensor for each division. From these plots it is evident that for any particular quencher there is a large number of sensors which give a conservative measure of bulk pool temperature (some more than 120 away f rom the discharging quencher) and thus the distribution and number of sensors is adequate.

Acceptance criterion (4) (minimal operator actions) is met as the operator must only confirm that at least 3 sensors from one SPTMS division and at least 1 sensor from the other division exceed the setpoint for any particular operator action [ 8] . When this occurs, the appropriate action is taken. The SPTMS recorders are side-by-side in the control room to facilitate the determination of bulk pool temperature.

Acceptance criterion (5) is similar to (3) and is met as described above. With a stuck-open relief valve, the rise rate of the pool temperature is less than 2 F/ min allowing the operator ample time to respond to control room alarms.

i alerted by an alarm when any of the 28 sensor elements exceeds operator action points TS1 or TS3.

6-5 l

TABLE 6-1 SPTMS PERFORMANCE (INDICATED - S.W.A.i BULK POOL TEMPERATURE)

Test Time into Extended Blowdown (min)

Run. No. 0 4 8 F 69 9.6 13.5 12.6 12.3 70 10.2 13.6 14.0 13.9 71 9.5 10.5 12.4 10.5 72 7.9 11.7 11.4 10.5 73 8.0 10.8 11.5 12.6 74 8.1 11.1 11.0 10.2 75 11.4 10.2 11.4 12.0 i

t S .W.A. - sensor weighted average i

1 l

i 6-6

.--.----r,-3 .,,< ,,,v.--,-.~.e - - - + - , . +,-.-..w,, --, - ,,w_-.. ,sy+, . . , - - - , , - .,..,,,,..,-..,...,..x.,,--ey,, , , . - -cwv

, . .- - - - . _ = _ -_. . . .

240.

220.- NUREG-0783 LIMIT f

~

l 200 A LOCRL (ENVELOPE)

~

\

BULK (ENVELOPE) e -

$ 180.-

T- .

uw

= -

a

= 160.-

w Q -

s:

w .

>=

140.-

l -

j 120.-

1 100.- . . ...i.....i.....i..... ..... .....

O. 1 2 3. 4 5. 6.

TIME FRON RERCTOR SCRRN(H8URS)

FIGURE 6-1

SUPPRESSION POOL TEMPERRTURE ENVELOPE l

7.0 REFE RENCES

1. Sargent & Lundy, "LaSalle County 1 - In-Plant S/RV Test Plan", Revision 5, November 24, 1982. (Proprietary)

2. U.S. Nuclear Regulatory Commission, " Suppression Pool Temperature Limits for BWR Containments", NUREG-0783, November 1981.

3. Commonwealth Edison, "LaSalle County Station - Mark II Design Assessment Report", Chapter 6.0, Revision 9, June 1981.

4. U.S. Nuclear Regulatory Commission , "LaSalle County Station Unit 1, Technical Specifications", NUREG-0861, April 1982.

5. U.S. Nuclear Regulatory Commision, " Mark II Containment Lead Plant Program Load Evaluation and Acceptance Criteria",

NUREG-0487, October 1978.

6. Wyle Laboratories, "LaSalle County 1 In-Plant S/RV Test Final Data Report," Volume 1, May 10, 1982.

(Proprietary)

7. Commonwealth Edison Co., LIS-CM04 Rev. 1, April 17, 1982.

8. Commt , wealth Edison Co., LOP-CM03 Rev. 1, May 19, 1982.

7-1

APPENDIX A 1

BULK POOL TEMPERATURE CALCULATIONS A.1 " SENSOR WEIGHTED AVERAGE" METHOD The initial and final bulk pool temperatures were computed by taking a weighted average of corrected test sensor readings.

All thirty-two of the working test sensors were used in this calculation. Individual weighting factors were determined by a two-step procedure. First the pool was divided into nine horizontal zones based upon the groupings of the individual sensor elevations. These nine zones were assigned individual weights based on relative volume. Table A-1 presents data for the nine zones including the test sensors within each of the zones and the weighting factor for each zone.

The second step in this procedure was to apportion individual zone weights amongst the sensors within that zone. The apportionment was done on a zone by zone basis with general rules for assigning weights to sensors. For example, sensors located closely together would have lower individual weighting than for an isolated sensor on the far side of the pool. When possible,the angles between adjacent sensors within a zone were bisected and individual sensor weights were set proportional to the area enclosed by the angle bisectors (relative to the cross-sectional area of the pool).

Individual sensor weighting factors, raw data, and bulk pool temperatures for initial and final pool conditions are presented in Tables A-2 and A-3r respectively. The raw data was read directly from sensor traces for the initial conditions. It was not possible to read directly the final sensor temperatures because at the time of S/RV closure, the test sensor readings oscillated for approximately five minutes with an amplitude of 5 F to 10*F. To obtain the appropriate final sensor temperature readings, the long-term temperature curve was extrapolated back to the time of S/RV closure.

A- 1

In computing the bulk pool temperatures, individual sensor readings were corrected for the observed sensor bias. These correction factors are given in Table A-4 along with the individual sensor bias observed at the start of each test.

It was assumed that the pool was quiescent at the start of_each test and that the pool temperature was azimuthally uniform.

A linear regression of sensor temperature reading versus sensor elevation was performed for each test run. All sensors but T48 were included in this analysis. (The location of T48 is far from that of the other 31 sensors). The sensor residual (or bias) was then calculated by subtracting the linear regression estimate from the raw data. These residuals were found to be very consistent from test to test (within 0.1*F) and this fact supports the notion that the pool temperature was azimuthally uniform. Residuals from the final test were not consistent with those from the first six tests. Since the suppression pool was much more thermally stratified in this case than in any other case (12*F from top to bottom vs. 3.5*F), this data was discarded when determining correction factors for individual sensors. The result of applying these correction factors to individual sensor reauings for input to the " sensor weighted average" method was to raise tne initial and final bulk pool temperatures by 0.1 F.

A. 2 ENERGY BALANCE METHOD l

The final bulk pool temperature was calculated by an alternative i

method using the first law of thermodynamics for an open system.

Mass and energy addition to the pool was from the steam discharge while heat removal was via operation of RHR Train A. The calculations were treated separately for the five cases with no RHR operation and the two cases with RHR operation.

s n

[

A -2

Runs With No RHR For test runs with no RHR we have U

f

=U f+bSRV h ggy at (A-1) where U=mc p v (T p - 32) and using "p,f * "p,i + SRV and suostituting into (A-1)

T P,f

= 3 2 + "p , icy (Tp,f - 32) +E SRV SRV A (A-2) m p f + zh SRV O where Uf,Uf - initial and final internal energy.of the suppression pool (Btu)

E SRV - mass flow rate of the S/RV (lb /sec) m h - enthalpy of S/RV flow (Btu /lb )

SRV At - duration of S/RV flow (sec) m pf m p,f - initial and final pool mass (lb ,)

cy - specific heat of water (= 1 Btu /lbm F)

The initial pool mass was determined from the initial pool water level and temperature. The S/RV mass flow rate was determined from the change in main steam line flow during the test. The S/RV flow enthalpy was taken as that of saturated steam at reactor pressure (which was determined from a strip chart).

Table A-5 presents the input parameters to Eq. (A-2) and the calculated final bulk pool temperature.

A-3

Runs With RHR For test runs 69 and 72, in addition to S/RV flow the pool

. temperature was being changed by RHR operation. Thus from the first law of thermodynamics for an open system we have:

dU dt SRV SRV + HX(hHX -h)p (A-3) where U - suppression pool internal energy (Btu) p t - problem time (sec)

E SRV - mass flow rate of S/RV (lb /sec) m h - enthalpy of S/RV flow (Btu /lb )

SRV m HX - mass flow rate of RHR Train A (lb /sec) h - return specific enthalpy of RHR flow (Btu /lb )

HX h - specific enthalpy of pool water (Btu /lb )

p

now P= (mpye '(Tp -32) ) =mc d (Tp -32) P py +cy (Tp-32) (A-4) and from mass conservation dn d SRV

^^

i

'Now let T

p

=

(Tp-32) (A-6)

,I l

i 1

i A-4 l . - - . - - . - - - - . _ - . - . - . _ _ . , - _

and because the change in pool mass is small (< 3% ) set

+

m p

~m = (m . +m P,f)/2 (A-7 )

P Pel where m . m initial and final pool masses (1b )

p,1, p ,f- m Now h

HX

-h p

= c (c (T sw -T p) p (A-8) where c - RHR-HX effectiveness T sw - service water temperature ( F)

Substituting (A-4), (A-5), (A-6), (A-7) and (A-8) into (A-3) and rearranging we obtain dT P + aT =8 (A- 9) dt P where a = (SSRV + HX c p /cv ))/m p and

• 8= ec p(T SW- cm

[0SRV SRV + HX vp Now solving ( A-7 ) we get

= Tp,1.e f+ h(1-e f)

T p,f

• -at -at (A - 10 )

Table A-6 presents the input parameters used in determining the final bulk pool temperature based on Eq. % - 10 ) . The initial pool mass and S/RV mass flow rate and enthalpy were determined as described in the previous section. The service

! water temperature was obtained from the test condition log sheets. The RHR mass flow rate and effectiveness were taken l

f rom [A l] . The effectiveness assumed was that for in unfouled heat exchanger.

A.3 COMPARISON OF ZONE METHOD TO ENERGY BALANCE METHOD Table A-7 presents a comparison of the final bulk pool tem-peratures calculated using the zone and energy balance methods.

I For the cases with RHR operation, the zone method yielded lower temperatures while for cases with no RHR operation, the two methods agreed to within 0.6*F.

i

! A-5 l

i An explanation for the differences between the two methods may l be found in the procedure used to obtain final test sensor readings from the data traces. At the time of S/RV closure, sensor readings oscillated for some time due to the non-equilib-rium conditien within the pool. To obtain the final temperature for individual sensors, the long term sensor response was extrapolated back to the time of S/RV closure. This was relatively simple for the five cases with no RHR operation as

the temperature profiles were flat for the last 40-50 minutes of data recording (e.g. see Figure C-3). Because heat was removed continuously for the two cases with RHR, the temperature readings decreased after the S/RV was closed and this decrease was not linear in most cases. Thus, it was difficult to determine by extrapolation the final sensor readings for runs with RHR operation.

i References Al) Commonwealth Edison Company, LaSalle County Station FSAR, Amendment 45, April 1979, Table 6.2-2.

l I

i l

i i

l l

A-6

TABLE A-1 SUPPRESSION POOL ZONE DESCRIPTION Number of Midplane Elevation Zone Sensors Zone Zone Sensor Elevation of of Zone Height Number In Zone Numbers Weighting Sensors Bottom (in) Factor 1 4 T1, T2, T3, T4 673'6" 673'4" 23.3" .07392 2 8 T8, T9, T10, Tll 677'1" 675'3" 32.6" .10343 T14, T15, T16, T18 3 2 T32, T33 678'11" 678'0" 24.6" .07805 4 3 T5, T7, T13 681'2" 680'0" 32.6" .10343 5 5 T21, T23, T24, 684'4" 682'9" 26.7" .08471 T28, T29 6 4 T22, T25, T30, T31 685'7" 685'0" 17.6" .05584 7 4 T17, T19, T20, T27 687'3" 686'5" 29.3" .09296 8 1 T26 690'6" 683'11" 70.3" .22302 9 1 T48 699'0" 694'9" 58.2" .18464

TABLE A-2 INITIAL SENSOR TEMPERATURE READINGS ( F)

Weighting Run Number Factor Sensor Sensor 69 70 71 72 73 74 75 W4 Bias ( F)

Tl 59.1 61.7 66.6 75.2 70.9'72.3 69.9 .0184800 0.73 T2 58.9 61.5 66.1 75.3 70.9 72.3 69.8 .0184800 0.60 T3 60.4 63.0 67.8 77.1 72.4 73.8 71.3 .0184800 2.17 T4 58.4 61.0 65.7 75.0 70.3 71.6 69.2 .0184800 0.10 T5 57.6 59.9 64.9 75.1 70.1 71.3 69.8 .0188759 -0.65 4

T6 - - - - - - - - -

T7 58.0 60.5 65.2 75.3 70.4 71.5 70.0 .0378094 -0.31 T8 57.5 60.1 64.8 74.6 69.9 71.1 68.8 .0075561 -0.67 T9 59.0 61.6 66.4 76.2 71.4 72.7 70.2 .0160603 0.87 T10 57.8 60.4 65.0 74.6 69.8 71.0 68.7 .0075561 -0.58 T11 58.4 60.7 65.4 75.2 70.4 71.6 69.5 .0075561 -0.07 T12 - - - - - - - - -

T13 58.1 60.6 65.4 75.4 70.4 71.5 70.0 .0467447 -0.23 T14 57.7 60.2 64.8 74.5 69.7 70.9 68.7 .0232144 -0.70 T15 58.0 60.4 65.1 74.8 70.1 71.2 68.9 .0263748 -0.40 T16 57.0 59.4 64.0 73.6 68.9 69.9 67.7 .0075561 -1.54 T17 60.1 62.5 67.5 77.8 72.7 74.1 77.7 .0232400 1.81 T18 57.5 60.1 54.7 74.3 69.5 70.7 68.5 .0075561 -0.87 T19 '

58.7 61.1 06.1 76.4 71.2 72.3 76.2 .0232400 0.32 T20 56.8 59.3 64.2 74.5 69.2 70.5 74.3 .0232400 -1.56 T21 58.6 61.1 66.0 76.0 70.8 72.3 73.9 .0147301 0.24 T22 57.1 59.5 64.3 74.5 69.2 70.5 73.6 .0149372 -1.42 T23 58.1 60.5 65.4 75.4 70.1 71.5 73.2 .0084711 -0.40 T24 58.4 60.9 65.6 75.8 70.5 71.8 72.8 .0170361 -0.06 T25 59.3 61.7 66.7 77.1 71.6 73.0 75.7 .0133861 0.98 T26 58.1 60.6 65.4 75.7 69.9 71.4 77.8 .2230200 -0.55 T27 59.6 62.1 67.3 77.7 72.4 73.8 77.5 .0232400 1.51 T28 59.5 61.9 66.7 76.7 71.6 72.9 73.3 .0232952 1.00 T29 59.3 61.7 66.6 76.7 71.6 72.9 72.3 .0211775 0.92 T30 57.6 60.1 65.0 75.3 69.9 71.3 74.2 .0145339 -0.73 T31 58.8 61.1 66.1 76.3 71.2 72.5 75.0 .0129828 0.41 T32 57.5 60.1 64.8 74.8 69.7 70.9 69.0 .0390250 -0.76 T33 58.1 60.7 65.5 75.3 70.4 71.5 69.6 .0390250 -0.15 T48 61.2 64.6 69.8 79.5 73.3 75.1 81.3 .1846400 -

Bulk 58.9 61.6 66.5 76.4 71.0 72.5 74.9 Temper-ature A-8

TABLE A-3 FINAL SENSOR TEMPERATURE READINGS ( F)

Weighting Run Number Factor Sensor Sensor l 69 70 71 72 73 74 75 Wi Bias (*F)

Tl 75.5 78.1 79.5 91.8 81.5 79.0 85.5 j.0184800 0.73 T2 74.2 79.5 80.8 92.8 83.2 80.0 87.0 I.0184800 0.60 T3 75.8 80.8 81.8 93.8 84.5 81.5 88.5 .0184800 2.17 T4 75.0 78.8 79.8 91.2 82.7 79.0 86.1 .0184800 0.10 TS 75.2 83.0 84.8 93.0 87.0 84.0 91.5 .0188759 -0.65 T6 - - - - - - - - -

T7 74.9 83.8 84.8 92.5 87.2 83.8 91.5 .0378094 -0.31

T8 74.0 80.5 82.0 89.5 85.0 81.2 89.2 .0075561 -0.67 T9 74.0 82.5 83.8 89.8 86.5 82.5 90.8 .0160603 0.87 T10 74.3 81.0 82.2 91.8 84.0 81.2 88.5 .0075561 -0.58

, T11 74.5 81.2 82.2 91.2 85.0 81.5 89.2 .0075561 -0.07 T12 - - - - - - - - -

T13 75.2 83.9 85.0 92.5 87.0 83.5 91.5 .0467447 -0.23 T14 73.5 80.1 81.5 90.1 83.3 80.1 88.1 .0232144 -0.70 T15 72.5 80.2 81.8 90.5 84.3 80.8 88.5 .0263748 -0.40 T16 73.0 79.5 81.5 89.9 83.0 79.9 88.0 .0075561 -1.54 T17 i 79.0 87.3 88.8 99.2 91.1 87.5 95.2 .0232400 1.81 T18 '

74.0 80.7 81.9 91.5 84.5 81.2 89.9 .0075561 -0.87 T19 78.2 86.0 87.8 98.1 89.5 86.2 93.6 .0232400 0.32 T20 .0232400 -1.56 l78.084.285.896.0 77.2 85.5 86.8 95.5 88.0 84.3 93.2 92.0 T21 , 89.0 84.5 .0147301 0.24 T22 !75.8 84.0 85.2 94.5 87.8 84.2 91.8 .0149372 -1.42 T23 2 74.5 85.1 86.0 95.0 88.0 84.8 92.8 .0084711 -0.40 T24 75.2 85.0 86.5 93.0 88.6 85.0 92.5 .0170361 -0.06 T25 77.2 86.5 87.8 95.0 90.1 86.8 94.5 .0133861 0.98 T26 79.0 86.8 88.0 95.8 88.9 86.8 94.0 .2230200 -0.55 T27 79.5 87.5 88.5 100.0 91.1 88.0 95.2 .0232400 1.51 T28 l 77.2 85.5 86.8 94.8 89.5 85.2 93.2 .0232952 1.00 T29 77.2 86.0 87.3 96.2 89.5 85.8 93.8 .0211775 0.92 i

T30 75.5 84.'3 86.2 96.0 88.5 84.8 93.0 .0145339 -0.73 T31 75.0 85.8 87.5 94.5 89.1 85.9 93.5 .0129828 0.41 T32 74.5 82.2 83.2 91.3 85.5 82.0 90.2 .0390250 -0.76 T33 75.2 33.0 84.2 92.8 85.9 83.6 90.8 .0390250 -0.15 T48 86.2 95.5 96.1 103.0 98.0 94.8 103.0 .1846700 -

Bulk 78.4 86.4 87.6 95.9 89.4 86.4 94.0 Temper-atire A-9

TABLE A-4 INDIVIDUAL SENSOR RESIDUALS (*F)

Std. Dev.

Mean of of First Run Number First Six Six Sensor 65 70 71 72 73 74 75 Cases ( F) Cases ( F)

T1 .80 83 1.08 .33 .58 .77 2.20 +0.73 .25 T2 60 .63 .58 .43 .58 .77 2.10 +0.60 .11 T3 2.09 2.14 2.27 2.21 2.07 2.26 3.46 +2.17 .09 T4 .10 .13 18 .13 - .02 .07 1.50 +0.10 .07 T5 L .75 - .94 - .75 - .46 - .45 - .53 -2.06 -0.65 .20 T6 I, - - - - - - - - -

T7 L .35 - .34 - .45 - .26 - .15 - .33 -1.86 -0.31 .10 T8 '- .83 - .75 - .78 - .57 - . 5 3 -- .56 - .73 -0.67 .13 T9 * .67 .75 .81 .98 .96 1.02 .40 0.87 .14 T10 p .53 - .45 - .59 - .62 - .64 - .68 -1.10 -0.58 .08 Til l .07 - .15 - .19 - .02 - .04 - .08 - .30 -0.07 .09 T12 t - - - - - - - - -

T13 L .25 - .24 . 25 - .16 - .15 - .33 -1.86 -0.23 .07 T14 L .65 - .78 - 67 - .73 - .76 - .83 -0.70 .06 T15 T16 h.63- .33 - .45 Ll.33 -1.45

.37

-1.58 -1.57

- .33

-1.53

- .46

-1.76

- .63

-1.83

-0.40

-1.54

.07

.15 T17 l1.71 1.68 1.75 1.70 1.97 2.04 2.54 1.81 .16 T18 L .83 - .75 - .88 - .87 - .93 - .96 -1.03 -0.87 .07 T19 .31 .28 .35 .30 .47 .24 1.04 0.32 .08 T20 -1.59 -1.52 -1.55 -1.60 -1.53 -1.56 - .86 -1.56 .03 T21 .22 27 .30 .14 .15 .34 .21 0.24 .08 T22 el.29 -1.32 -1.43 -1.48 -1.49 -1.51 - .84 -1.42 .09 T23 - .28 - .33 .31 - 48 - .56 - .47 - .62 -0.40 .11 T24 02 .07 - .10 - 04 - .15 - .15 - .75 -0.06 .09 T25 1 .92 .88 .98 1.16 .92 1.01 1.53 0.98 .10 T26 - .32 - .21 - 40 - .69 - .93 - .78 .94 -0.55 .29 T27 1.21 1.28 1.56 1.61 1.67 1.75 2.45 1.51 .22

! T28 1.13 1.07 1.01 .89 .96 .97 - .08 1.00 .08 T29 l .93 .87 .91 .89 .96 .97 -1.08 0.92 .04 T30 L .78 - .72 - .72 - .65 - .78 - .69 - .02 -0.73 .05 T31 .42 .28 .38 .36 .52 .51 .83 0.41 .09 i T32 - .84 - .75 - .81 - .56 - .79 - .84 -1.65 -0.76 .11 T33 - .24 - .15 - .11 - .06 - .09 - .24 -1.05 -0.15 .08 T48t i

i Not included in analysis.

A-10 i

4 4

I TABLE A-5, FINAL BULK POOL TEMPERATURE BY ENERGY BALANCE MBTHOD i FOR RUNS WITH NO RHR Run Number Parameter 70 71 73 74 75

'; Znitial Pool Level 26'2 26'2 26'4 26'3h" 26'3 "

i Initial Pool Mass

.; (x 106 lbm) 8.035 8.030 8.069 8.037 8.034 l

Initial Pool Temperature (*F) 61.6 66.5 71.0 72.5 74.9 j S/RV Mass Flow Rate (lbm/sec) 167. 167. 169. 172. 175.

, S/RV Blowdown

Duration (sec) 1021. 866. 772. 573. 781.

j RPV Pressure (psia) 959. 955. 955. 955. 957.

S/RV Flow Enthalpy (Btu /1gm) 1194. 1194. 1194. 1194. 1194.

i Final Pool Temperature (*F)- 85.9 87.0 89.4 86.5 94.2 i

l 4

i

A-11 l

f p t e.sr - >= r r,,v, =w,-me, ,--v .- --.-w, w- -,-.,,m,, e.-s,e-t-,ewr,,,r.rg-, p.-*-ww n,m= r-t w w w - e- r--w r ee' W F " W ' ? g *1ew w'~ r iv e '" w-y

l 2

TABLE A-6 FINAL BULK POOL TEMPERATURE BY ENERGY BALANCE METHOD FOR RUNS WITH RHR Run Number i Parameter 69 72 Initial Pool Level 26'3 26'2" I

Initial Pool Water Mass (x106 lbm) 8.057 8.006 i

Initial Pool Temperature ( F) 58.9 76.4 S/RV Mass Flow Rate (1b /sec) 172. 178.

, S/RV Blowdown Duration (sec) 901. 905.

e j RPV Pressure (psia) 960. 955.

i

, S/RV Flow Enthalpy l (Btu /lb ) 1194. 1194.

I

, RHR Mass Flow Rate (lbm /sec) 1036. 1036.

i

! RHR Effectiveness .409 .409

= Service Water

{ Temperature (*F) 44. 44.

i

Final Bulk Pool j Temperature (*F) 79.7 97.1 i

k I

A-12 I

_ . . _ , . - ~ . . _ . , . - _ . . . _ . . _ _ _ , . . _ . . - . ~ _ . _ - . _ . . _ _ _ _ . . _ , _ . . . . ..,. . . , . . . - , _ . , . . . , _ . . . . . _ . . . . - . _ _ . . .

TABLE A-7 COMPARISON OF " SENSOR WEIGHTED AVERAGE" METHOD TO ENERGY BALANCE METHOD Run Number With RHR Without RHR 69 72 70 71 73 74 75 Initial Bulk Pool Temperature ( F) 58.9 76.4 61.6 66.5 71.0 72.5 74.9 Final Bulk Pool Temperature (*F)

" Sensor Weighted j Average" Method 78.4 95.9 86.4 87.6 89.4 86.4 94.0 Energy Balance Method 79.7 97.1 85.8 87.0 89.4 86.5 94.2 Temperature Rise

("SWA" Method) _

(*F) 19.5 119.5 24.8 21.1 18.4 13.9 19.1 Difference l (Energy-SWA)

( F)

+1.3 +1.2 -0.6 -0.6 +0.0 +0.1 . +0.2

% Difference +6.7 +6.2 -2.4 -2.8 +0.0 +0.7 +1.0 I

i

~~

I As a % of the total temperature rise 4

l l

l i

A-13

APPENDIX B APPLICABILITY OF DATA TO HIGHER POOL TEMPERATURES For the seven extended blowdown tests, the bulk pool temperature ranged between 58*F and 97*F and the local-to-bulk pool temperature differences were determined for pool temperatures in this range. Tests and measurements were not made outside of this range due to restric-tions on plant operation included in the Technical Specifications.

However, the local-to-bulk pool temperature determinations are only of interest at much higher bulk pool temperatures (160*F to 200*F).

The properties of water, in particular the Prandtl number, vary significantly between the test range and the range over which the test results are to be applied. Since for a fixed geometry the Prandtl number controls the mixing process, the validity of applying measured data from one temperature range to another range must be demonstrated. This appendix shows that the measured local-to-bulk pool temperatures determined from the extendea blowdown tests can be applied directly and conservatively to higher pool temperatures.

For the purposes of determing the functional dependence of the local-to-bulk pool temperature difference on bulk pool temperature, the flow field resulting from a discharging T-Quencher may be idealized as an axisymmetric plume [Bl]. The condensing steam is the source of

'bouyancy and the general expression for the centerline plume temperature is:

t 9 - t,=pf

• 2 kx (B-1) where t - centerline plume temperature t, - ambient or bulk temperature h(o)- factor (dependent only upon Pr)

Pr - Prandtl number k - thermal conductivity of fluid at t, x - axial distance along plume Q - heat source B-1

By taking the ratio of Eq. B-1 at one temperature to Eq. B-1 at some reference temperature (say 100 F), the functional dependence of plume conterline temperature on ambient temperature can be determined. Notice that this ratio is independent of axial distance along the plume. Figure B-1 presents the functional dependence of plume centerline temperature on bulk temperature for water. Since the local-to-bulk pool temperature difference is analogous to (t, - t,) very near the heat source of the plume, this figure shows that the local-to-bulk pool temperature difference in the range of application is about 96% of the local-to-bulk pool temperature difference for the range of measurement. Thus the measured local-to-bulk pool temperature difference na;r be directly and conservatively applied to the range of applicability The idealization of the flow field from a discharging quencher as an axisymmetric plume is for purposes of determining the functional dependence of local-to-bulk pool temperature difference only and should not be taken too literallj. There are many effects not taken into account in the idealization such as the finite size of the pool, momentum near the quencher exit, and pool stratification. This analogy may not accurately quantify the bulk pool temperature effect on local-to-bulk pool temperature difference. IIowever, since the basic mechanisms of the two flows are the same, (i.e. heat source induced buoyancy), the functional dependence should be the same.

l References B1) Gebhart, B., Heat Transfer, 2nd Edition, pg. 354, McGraw-Hill, New York, 1971 B-2 i

L

1 02 1 01 -

e -

C E 1 00 -

w .

U E

w -

w .

u.

h. .

O w .99 - ,

x -

3 p--

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e-g .98 -

U -

, e

.97 -

.96 ....... ... ... ......,,,..

60 80 100 120 140 160. 180. 200

, WRTER TEMPERATURE IDED F) l l FIGURE 8-1: TEMPLRATURE DIFFERENCE RATIO

(

i i

B-3

- _ . _-- . . . _ _ - _ _ _ _ ~ _ _ . .

APPENDIX C LIST OF FIGURES Page Figure C-1: Local Pool Temperature - Run 69 C2 Figure C-2: Local Pool Temperature - Run 70 C3 Figure C-3: Local Pool Temperature - Run 71 C4 Figure C-4: Local Pool Temperature - Run 72 C5 Figure C-5: Local Pool Temperature - Run 73 C6 Figure C-6: Local Pool Temperature - Run 74 C7 Figure C-7: Local Pool Temperature - Run 75 C8 Figure C-8: SPTMS - Run 69 C9 Figure C-9: SPTMS - Run 70 Cll Figure C-10: SPTMS - Run 71 C13 Figure C-ll: SPTMS - Run 72 C15 Figure C-12: SPTMS - Run 73 C17 Figure C-13: SPTMS - Run 74 C19 Figure C-14: SPTMS - Run 75 C21 Figure C-15: SPTMS-Variation and System Bias Removed - Run 69 C23 Figure C-16: SPTMS-Variation and System Bias Removed - Run 70- C25 Figure C-17: SPTMS-Variation and System Bias Removed - Run 71 C27 Figure C-18: SPTMS-Variation and System Bias Removed - Run 72 C29 Figure C-19: SPTMS-Variation and System Bias Removed - Run 73 C31 Figure C-20: SPTMS-Variation and System Bias Removed - Run 74 C33 Figure C-21: SPTMS-Variation and System Bias Removed - Run 75 C35 C-1

. _ ~ . _ . -_ _ - - . - -

90 .- .- .- ,- ,- ,- ,-

i 80 -

n ,in r~,i re,,..,,,.,,,.

0 .

0

%~-

0 d

W 70-}

G O<

E

$ 60 -

Sensor T4 50 .. .. i. i. i. .i. . .. .

0 10 20 30 40 50 60 70 80 Time (min)

I 90 .,. .,. .,. .,. .,. .,. ..

Bul k tw.! Teneer,it u re F

d 70 _

x_ ~~ _ _ _

N

~~~

o s ---

4J (

4 W

0 r

j 60 ,

Sensor T32

^*'

50 80 0 10 20 30 40 50 60 70 Time (min)

Figure C-1: Local Pool Temperature-Run 69 C-2

100 i- ,- i- .- -

{

l C 90- au i,. n ,. Tenierotur, -

O k ,

D

/(,

8 -

3 (

g _~

e i q 0 d E* ,

70 / _

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/

. i. .e. .e. .. .n. .. .i.

0 10 20 30 40 50 60 70 80 Time (min) 100 -

i-i- i- i-Y aulk Pool Temperature c >

yh _.

e V l g 80 - -

42 40 W  !

O CL E

$ 70 - -

Sensor.T13 1

60 - '- '- '- '- '- '- '-

0 10 20 30 40 50 60 70 80 Time (min)

Figure C-2: Local Pool Temperature-Run 70 C-3

100 r r r r -

r r r r 90 -

b n i "i'n'rrdur- -

- I w

W /

o 80 l

a } - -

~

4 N l b C '

a 6

Ci 9 70 - -

% nsrir T2 60 -- - '--- ' --- - '--- '- -- ' -- -- '-- - ' -- - '- '- --

0 10 20 30 40 50 60 70 80 90 100 Time (min) 100 r r r r r r r r r I

90 -

I 8"' "'^2 Tenperature -

IL4 b ,h  !

/ -

_ ~ -

0 W

c 80 - -

a 4

4 0

R i E

o P 70 .

Sensr6r T33 60 .. .. ... .. .i. .. ... .i. .i.

0 10 20 30 40 50 60 70 80 90 100 Time (min) 1.

Figure C-3: Local Pool Temperature-Run 71 C-4

110 i-i- -

- i-100 - -

C Bulk Pool T(mperature 0

90 k -

/

a o

80 -

. suns tr '.'4,

' ' ^

70 0 10 20 30 40 50 60 70 E0 Time (min) 110 i-i- i- s- i- s-

, I,p {

N O

Du l k Por.1 Tempe r a t u r**

90 -

o h g ,

__N_

l E

E o

t- 80 - - -

Senser T32

.i. .r. .e. .t. .t. t- 8-0 10 20 30 40 50 60 70 80 Time (min)

Figure C-4: Local Pool Temperature-Run 72 C-5

... _ . - _ m 110 ..

100 - -

c o *

\f l

w I itu l k Pen t Terre rat ure 90

• k

~

Y [

} ,

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Ed Renant T2 y .g. .f. .t. .I. .t. 4.t. .E.

0 10 20 30 40 50 60 70 80 Time (min) l 100 ,- .- .- i- .-

I Bistk Poni Temperature

~

N 90 -

O 0

a d

W e 80 a /

E o '

Ed i

f sens,t 731 70 '- '-

0 10 20 30 40 50 60 70 80 Time (min)

Figure C-5: Local Pool Temperature-Run 73 C-6

- . _ . . . _ . - - _ = _ _- -- --- - _

100 i- i-i- .- i-i e

ha e

90- ~

h Bulk I'ec'l Tenf+rature o

D  ! /

a \ '

d l-4 s o

(L s 80 -

o -

Ed ~

h senser 'r2 0

0 lb 2b 30 40 0 0 70 80 Time (min) 100 ,- - -

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) ~

o Julk Pool Temperature o

4 3

a c

4

$ ~

@ 80 E* l j

i

/ si._, vu 70 0 1k) 2b 0 40 b 6b 70 80 Time (min)

Figure C-6: Local Pool Temperature-Run 74 C-7

110 .- .- .-

.- i- -

1 l

100 - -

Dulk roel 'iemperature I L 90 - -

o __ _-

I -

a /i ft! -

$ 80 ) -

CL E

O Ed 70 - -

Sensor Y2

^ ^

60 0 10 20 30 40 50 60 70 Time (min) no '

100 - -

Bu l s n< n t Yer:er r a t u r o

,. - ~ - . - - .

- 90 -

v -

0 M D '

u 80  : -

O Q4 E i O

E*

70 -

Sensor T31 60 - i- i- i- i- i- i-0 10 20 30 40 50 60 70 Time (min)

Figure C-7: Local Pool Temperature-Run 75 f

C-8 L

90 90.

ESS DIV 1 T=0 NIN  : ESS DIV 2 T=0 NIN

[  : 0-SPTNS-DRTR [  : e-SPTNS-DATR o 80.- o 80.-

id - l11 -

O . O -

w w .

E 70.I E o

70.-

-n g 8 8 o -

e 8 gee e 0

$  : ee $

a:

D8 8 e '

E 60.- E 60.-

[  : S.W.A BULK d

S.W.A. BULK l e- .

50.'...........,........... ...... .... 50. ..... .....,...........,.....,.....

120.

-180. -120. -60. O. 60. 120. 180. -180. -120. -60. O. 60. 180.

n QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELATIVE RZINUTH IDEG) a

90. 90.

ESS DIV 1 T=4 NIN  : ESS DIV 2 T=4 NIN

[ e-SPTNS-DRTR [ _- e-SPTMS-DATR o 80.- o 80.-

0 $ O S b E  : @@ -

_n Q

E 70. 9 E 70.-

3 - 3 -

p- . >- -

C G

@ - S.W.A. BULK @ -

S.W.A. BULK

a. 60.- a. 60.-

r - r -

W  : #  :

50.'...........

~

50.- ....................... ........... .......... ...... .....

-180. -120. -60 O. 60. 120. 180. -180. -120 -60. O. 60. 120. 180 QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG)

FIGURE C-8R: SUPPRESSION POOL TEMPERATURE MONITORING SYSTEM - RUN 69

I 100. 100 '

ESS DIV 1 T= 8 NIN ESS DIV 2 T= 8 NIN

[  : e-SPTMS-DATR [  ; e-SPTNS-DATR e 90.- o 90.-

t 8  : 8 0

g8 b lwe 80.-

I e @e e 8 w x 80.-

3 l 2 -

ee o -n@

e l lE  : $

x x

E 70.- E 70.5 l 5  : S.W.A. BULK y  : S.W.A. BULK i- .

60.'..... ..... ..... ..... ..... ..... 60.'..... ..... ..... ..... ...........

-180. -120. -60. O. 60. 120. 180. -180. -120. -60. O. 60. 120. 180.

o QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) i E

100. 100.

ESS DIV 1 T=14 NIN  : ESS DIV 2 T=14 NIN

[ 0-SPTNS-DATA [  ; e-SPTNS-DRTA e 90.- g e o 90.-D e @e 8 w -

g 88 w -3 S  : *e S  : @ e E 80.- E 0

80.I -

2 -

$ S.W.A BULK $

x S.W.A. BULK x

E 70.- E 70.-

r - r -

w - IAI 60.'.....i........... ..... ........... 60. ' ..... ..... ..... ..... ..... .....

-180. -120. -60. O. 60. 120. 180. -180. -120. -60. O. 60. 120. 180.

QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH IDEG)

FIGURE C-8B: SUPPRESSION POOL TEMPERATURE MONITORING SYSTEM - RUN 69

90 90.

ESS DIV 1 T=0 MIN  : ESS DIV 2 T=0 MIN

[  ; e-SPTMS-DRTR C  : e-SPTNS-DATR e 80.- o 80.-

w - w -

Q - O -

w w .

~

E 70.- b eg 8 @@ 8 E 70.- e $g I

2 - m -

e i 1 w - w -

C -

C -

x e E 60.- S.W.A. BULK E 60.5 S.W.A. BULK r -

r -

W - W -

W - & -

~

50. ..... ..... ........... ..... ..... 50.'..... ..... ..... ..... ...........

-180. -120. -60. O. 60. 120. 180. -180. -120. -60. O. 60. 120. 100.

n QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSBR RELATIVE RZINUTH (DEG)

H

90. 90.

ESS DIV 1 T=4 NIN  : ESS DIV 2 T=4 NIN

[  ; e-SPTNS-DRTR [  ; e-SPTMS-DRTR e 80.- 8e e 80.- e8 e w - 8 w -

e e a O e e

g a g - -

e og E

a 70.- -

E 2

70.I -

$  ; S.W.A BULK $

e

S.W.A. BULK e

E 60.- E 60.-

r - r -

W - W -

& - W .

50.'...........

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QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG)

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QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG)

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QUENCHER-SENSOR RELATIVE RZINUTH (DEG)' QUENCHER-SENSBR RELATIVE RZINUTH (DEG)

U1 90 -

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QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSBR RELRTIVE GZINUTH (DEG)

FIGURE C-16R: SPTMS -- VARIRTION AND SYSTEN BIRS REMOVED - RUN 70

l l

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n QUENCHER-SENSBR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) h w

100. 100.

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QUENCHER-SENS8R RELRTIVE RZINUTH (DEG) QUENCHER-SENSBR RELRTIVE RZINUTH (DEG)

FIGURE C-17R: SPTMS - VARIRTION RND SYSTEM BIRS REMOVED - RUN 71

110. 110.

ESS DIV 1 T=4 MIN  : ESS DIV 2 T=4 NIN

[  : 0-SPTNS DRTR C -

e-SPTMS DRTR e 100.- e 100.-

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QUENCHER-SENSOR RELRTIVE RZINUTH (OEG) QUENCHER-SENSOR RELRTIVE RZINUTH COEG) o co 110. '

110.

- ESS DIV 1 T=8 NIN  : ESS DIV 2 T=8 NIN

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QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSOR RELATIVE AZINUTH (OEG)

FIGURE C-178: SPTMS - VARIATION AND SYSTEM BIRS REMOVED - RUN 71

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QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSOR RELATIVE RZINUTH (DEG) 100. 100.

ESS DIV 1 T=2 NIN  : ESS DIV 2 T=2 NIN

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60. 180.

QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG)

FIGURE C-19R: SPTMS - VARIRTION AND SYSTEM BIRS REMOVED - RUN 73

i 110. 110.

I  : ESS DIV 1 T=4 NIN  : ESS DIV 2 C T=4 NIN

O-SPTMS DATR [  ; e-SPTNS DRTR e 100.- e 100.-

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n QUENCHER-SENSOR RELATIVE REIMUTH (DEG) QUENCHER-SENSSR RELRTIVE RZINUTH (DEG) i U

110. 110.

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[  ; e-SPTMS DATA C -

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QUENCHER-SENSOR RELATIVE RZINUTH (DEG) QUENCHER-SENSOR RELATIVE RZINUTH (DEG)

FIGURE C-198: SPTNS - VARIRTION AND SYSTEM BIRS REMOVED - RUN 73

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o QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) 110 110.

ESS DIV 1 T=8 NIN  : ESS DIV 2 T=8 NIN C  : e-SPTNS DRTR C  : e-SPTNS DATR e 100.- e 100.-

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QUENCHER-SENSBR RELRTIVE RZINUTH (DEG) QUENCHER-SENSBR RELRTIVE RZINUTH (DEG)

FIGURE C-206: SPTMS - VARIRTION RND SYSTEM BIRS REMOVED - RUN 74

0 0 8

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. . . . . . . . . . G 0 0 0 0 0 0 0 0 0 0 I 1 0 9 8 7 1 0 9 8 7 F 1 1 1 1 C ew*" E3 m5a_rwr o# C ewo E= $a.h

110. '

110.

ESS DIV 1 T=4 NIN C  ;

ESS DIV 2 T=4 NIN e-SPTMS ORTR [ -

e 100.- e-SPTMS ORTR w . e *00.-

~ w .

~

Q .

~

E 90.I E 90.-

7 5  :

e e ma E g

e m

m

e a w . g O O  %

O g w e0 80 7 s,w,A, gung g 80.

w . S.W.A. BULK r -

w .

r -

70. .....,.....,.....,.....,.....,..... 70.'.....,.....,..... ..... ..... .....

-180. -120. -60. O. 60. 120. 180. -180. -120. -60. O. 60. 120. 180. .

QUENCHER-SENSOR RELATIVE RZINUTH (DEG)

QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) 110. 110.

ESS DIV 1 T=8 NIN  : ESS O!V Z

[ -

e-SPTNS ORTR T=8 NIN C -

e-SPTNS ORTR I

e w

100.2 e 100.5 w

S 0

e es S  : 8 w -

e a w e 8 e 90.- O e m 90.5 m ai m .

o .

e

$  : S.W.A. BULK $ '

= = S.W.A BULK E

~

80.- E 80.-

i n

y r .

W -

8- .

70.'........... .....,.....,........... 70.'...........,..... ........... .....

l -180. -120. -60. O. 60. 120. 180. -180. -120. -60. O. 120.

60. 180.

QUENCHER-SENSOR RELRTIVE RZINUTH (DEG) QUENCHER-SENSOR RELATIVE RZINUTH (DEG)

FIGURE C-218: SPTMS - VARIRTION AND SYSTEM BIRS REMOVED - RUN 75