ML20237G040
| ML20237G040 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/01/1987 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20237G024 | List: |
| References | |
| 2816R, NUDOCS 8709020074 | |
| Download: ML20237G040 (97) | |
Text
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i REACTOR CONTAINMENT BUILDING INTEGRATED LEAK RATE TEST I
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l LASALLE COUNTY NUCLEAR POWER STATION j l'
COMMONWEALTH EDISON COMPANY DOCKET NUMBER 050-374 UNIT TWO JUNE 1, 1987 8709020074 070825 PDR ADOCK0500{y4 P
Docwnent 2816r/
o TABLE OF CONTENTS PAGE TABLES AND FIGURES INDEX. . . . . . . . . . . . . . . . . . . . . IV INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A. TEST PREPARATIONS. . . . . . . . . . . . . . . . . . . . . . 2 A.1 Type A Test Procedure . . . . . . . . . . . . . . . . . 2 A.2 Type A Test Instrumentation . . . . . . . . . . . . . . 2
- a. Temperature
- b. Pressure
- c. Vapor Pressure
- d. Flow A.3 Type A Test Measurement . . . . . . . . . . . . . . . . 3 A.4 Type A Test Pressurization. . . . . . . . . . . . . . . 3 B. TEST METHOD. . . . . . . . . . . . . . . . . . . . . . . . 9 B.1 Basic Technique . . . . . . . . . . . . . . . . . . . .9 B.2 Supplemental Verification Test. . . . . . . . . . . . . 10 B.3 Linear Regression Analysis. . . . . . . . . . . . . . . 10 B.3 Instrumentation Error Analysis - Application. . . . . . 10 i
C. SEQUENCE OF EVENTS . . . . . . . . . . . . . . . . . . . . . 12 C.1 Test Preparation Chronology . . . . . . . . . . . . . . 12 C.2 Test Pressurization Chronology. . . . . . . . . . . . . 13 C.3 Temperature Stabilization Chronology. . . . . . . . . . 14 C.4 Measured Leak Rate Phase Chronology . . . . . . . . . . 14 c.5 Induced Leak Rate Phase Chronology. . . . . . . . . . . 14 C.6 Depressurization Phase Chronology . . . . . . . . . . . 15 D. TYPE A TEST DATA . . . . . . . . . . . . . . . . . . . . . . 16 D1 Measured Leak Rate Phase Data . . . . . . . . . . . . . 16
. D.2 Induced Leak Rate Phase Data . . . . . . . . . . . . . 16 E. TEST CALCULATIONS. . . . . . . . . . . . . . . . . . . . . . 33 F. TYPE A TEST RESULTS AND INTERPRETATION . . . . . . . . . . . 34 F.) Measured Leak Rate Phase Data Results . . . . . . . . . 34 F.2 Induced Leak Rate Phase Data Results. . . . . . . . . . 34 F.3 Leak Rate Compensation for Non-Vented Penetrations. . . . . . . . . . . . . . . . . . . . . . 35 F.4 Change in Drywell Sump Level. . . . . . . . . . . . . . 35 F.5 Evaluation of Instrument Failures . . . . . . . . . . . 36 F.6 Calculated Adjusted Type A Test Results . . . . . . . . 39 APPENDIX A TYPE B AND C TESTS . . . . . . . . . . . . . . . . 43 l
APPENDIX B TYPE B AND C TEST
SUMMARY
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- - APPENDIX C HYDROSTATIC TEST RESULTS . . . . . , . . . . . . . 65 j 1
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APPENDIX D PLILRT CALCULATIONS . . . . . . . . . . . . . . . 69
. APPENDIX E BN-TOP-1, REV. 1 ERRATTA . . . . . . . . . . . . . 81 l
APPENDIX F MASS-PLOT (ANS/ ANSI 56.8) METHOD LEAK RATE i l
RES8JLTS . . . . . . . . . . . . . . . . . . . . . .85 j 1
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TABLES AND FIGURES INDEX j
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. TABLE 1 INSTRUMENT SPECIFICATION . . . . . . . . . . . . . . . .4
- i TABLE 2 PCILRT INSTRUMENT PHYSICAL LOCATION. . . . . . . . . . .6 i i
FIGURE 1 ELEVATION VIEW OF CONTAINMENT AND SUBVOLUME . . . . . .8 LOCATIONS TABLE 3 MEASURED LEAKRATE PHASE. . . . . . . . . . . . . . . . 18 l
FIGURE 2 BECHTEL LEAKRATE VS. TIME. . . . . . . . . . . . . . . 19 FIGURE 3 CONTAINMENT DRY AIR PRESSURE VS. TIME. . . . . . . . . 20 l i
FIGURE 4 CORRECTED PRESSURE VS. TIME. . . . . . . . . . . . . . 21 l 1
FIGURE 5 AVG. SUBVOLUME RTD TEMPERATURE VS. TIME . . . . . . . . 22 (
l FIGURE 6 AVG. SUBVOLUME DEWCELL TEMPERATURES VS. TIME . . . . . 23 I
FIGURE 7 AVG. SUBVOLUME VAPOR PRESSURE VS. TIME . . . . . . . . 24 l 1
TABLE 4 INDUCED LEAKhATE PHASE. . . . . . . . . . . . . . . . . 26 I
I FIGURE 8 BECHTEL INDUCED LEAKRATE VS. TIME . . . . . . . 27 1
l FIGURE 9 CONTAINMENT DRY AIR PRESSURE VS. TIME (INDUCED). . . . 28 l l
FIGURE 10 CORRECTED PRESSURES VS. TIME (INDUCED) . . . . . . . . 29 !
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FIGURE 11 RVG. SUBVOLUME RTD TEMPERATURES VS. TIME (INDUCED) . . 30 !
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FIGURE 12 AVG. SUBVOLUME DEWCELL TEMPERATURES VS. TIME (INDUCED). 31 1
FIGURE 13 AVG SUBVOLUME VAPOR PRESSURES VS. TIME (INDUCED). . . 32 l I
l FIGURE 14 ABNORMAL DEWCELL SPIKING. . . . . . . . . . . . . . . . 37 l 1 '
1 FIGURE 15 ABNORMAL DEWCELL SPIKING EFFECTS. . . . . . . . . . . . 38 I TABLE 5 CALCULATED ADJUSTED LOCAL LEAKRATES. . . . . . . . . . 40 TABLE 6 TYPE B AND C TEST RESULTS . . . . .. . . . . . . . . . . 44 1
l TABLE 7 HYDROSTATIC TEST RESULTS. . . . . . . . . . . . . . . . 66 TABLE 8 MASS-PLOT METHOD LEAKRATE PRASE. . . . . . . . . . . . 86 l
l FIGURE 16 MASS-PLOT METHOD LEAKRATE VS. TIME. . . . . . . . . . . 87 l
l FIGURE 17 CONTAINMENT DRY AIR MASS VS. TIME. . . . . . . . . . . 88 l
TABLE 9 MASS-PLOT METHOD INDUCED LEAKAGE PHASE. . 90 l . . . . . . .
1 FIGURE 18 MASS-PLOT METHOD INDUCED LEAKRATE VS, TIME . . . . . , 91 FIGURE 19 CONTAINMENT DRY AIR MASS VS, TIME (INDUCED). . . . . . 92 Document 2816r/
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INTRODUCTION !
- I This report presents details of the Integrated Primary Containment Leak Rate Test (IPCLRT) successfully performed on June 1, 1987 at LaSalle County Nuclear Power Station, Unit Two. The test was performed in accordance with 10CFR50, Appendix J and the LaSalle County Unit Two Technical Specifications. LaSalle County Station is a BWR 5, Mark II containment, located in Marseilles, .
Illinois. LaSalle Unit Two received its operating license on June 19, 1984. l I
j A short duration test (approximately 6 1/2 hours) was conducted using the ]
l general test method outlined in BN-TOP-1, Revision 1 (Bechtel Corportion l l Topical Report) dated November 1, 1972.
i The total primary containment integrated leakage rate was found to be 0.1766 I wt%/ day at a test pressure of 40.2 psig, which is within the 0.476 wt%/ day l l
acceptance criterion. This value is the sum of the statistically averaged <
I leakage rate of 0.0426 wt%/ day plus the leakage rate of all non-vented l penetrations which is 0.134 wt%/ day. The total 95% upper confidence limit l leakage rate was found to be 0.4055 wt%/ day. This value is the sum of the l mear,ured 95% upper confidence limit of 0.2715 wt%/ day plus the leakage rate of l all non-vented penetrations which is 0.134 wt%/ day. l l
The total "As Found" containment leakage rate was found to be 1.2535 wt%/ day which is in excess of 0.476 wt%/ day acceptance criterion. This value is the i sum of the measured 95% upper confidence limit of 0.2715 wt%/ day, plus the )
l leakage rate of all non-vented penetrations which is 0.134 wt%/ day, plus the 1 I
l local leakage rates from penetrations repaired (with lower leakage rates) during the first refueling outage prior to the Type A test which is 0.848 l wt%/ day. l The supplemental induced phase leakage test result was found to be 0.7413 wt%/ day. This value should compare with the sum of the measured leak rate phase of 0.0426 wt%/ day and the induced leakage rate of 0.6450 wt%/ day (381.23 i SCFH), the sum of which being within the 1 0.159 wt%/ day (0.25 La) tolerance I band. l J
Since this is the first type "A" As Found test failure, the next Integrated j Primary Containment leek rate test is scheduled to be performed during the I third refueling outage (tentatively scheduled for May, 1990). I l
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f SECTION A - TEST PREPARATIONS l
A.1 Type A Test Procedure 1 The IPCLRT was performed in accordance with LaSalle County Procedure ]
LTS-300-4, Revision 12, Dated May 1, 1987. Temporary Procedure q change Numbers 60-87 and 65-87 were made to LTS-300-4 to correct the ;
procedure for typographical errors on Pre / Post Test Sign-off sheets to verify proper pre / post test alignment. l These procedures were written to comply with 10CFR50 Appendix J, ANSI N45.4-1972, LaSalle County Unit Two Technical Specifications, and to reflect the Nuclear Regulatory Commissions, approval of a short duration test using the BN-TOP-1, REV. 1 Topical Report as a test method. J i
A.2 Type A Test Instrumentation 1
Table one shows the specifications for the instrumentation used in )
the IPCLRT. Table Two lists the physical locations of the j temperature and humidity sensors within the primary containment.
- a. Temperature l
Sensors were suspended to prevent direct thermal influences from' {
any metal surfaces. Sensors were also kept away from any direct
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air flows. i 4
Each RTD-bridge network was calibrated to yield an output of 60 l mv to 120 mV over the range of 60'F to 120*F. Calibrations were done by Volumetrics of Paso Robles, California. Calibration sheets for the RTD's and their signal conditioning boards is included in Table one.
- b. Pressure Two precision quartz bourdon tube pressure. gauges were utilized. Each gauge had a local digital readout in addition to a Binary Coded Decimal output to the process computer. Primary containment pressure was sensed by the pressure gauges in parallel through a 3/8" tube connected to a test tap on a primary containment penetration.
Each precision pressure gauge was calibrated over the range 0 psia to 100 psia in approximately 5 psia increments using a Volumetrics Inc. VMC 826T calibration standard.
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- c. Vapor Pressure Ten Lithium Chloride Dewpoint Temperature Units were installed throughout the Drywell and Suppression Pool. The dewpoint cells were placed in locations where the chance of the dewcell becoming damaged was slight.
A calibration was done on each dewcell network over the range of dewpoint temperatures of 45'F to 90*F. Calibration was done to yield an output of 45 mV to 90 mv over the range of 45' to 90'F. Calibrations were performed by Volumetrics using dewcell standard, Volumetrics Inc., Serial No. VMC211/714.
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- d. Flow :
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A rotameter flowmster, Fischer-Fort 6r, Calibrated!LO Within 11.0% by Fischer-Porter, was used for flow measurement. Tubing '
connected-the rotameter to a test connection on one of the primary containment penetration lines.
A.3 Type A Test Measurement The IPCLRT was performed utilizing an interface with the Volumetrics j Data Acquisition System (DAS) and Prime Computer. Information from the RTD's and dewcells is sent to a' Dual Multiplexer Scanner in the Drywell. The Scanner takes the data and sends it through an j electrical penetration (E-20) to a System Console. The System Console takes the raw data and converts it into data readable to a computer and the test engineer. This-information is then sent to the Prime Computer where all needed calculations are performed and a hard ,
copy of the information is produced. I l
i A.4 Type A Test Pressurization 3 l
l l One 3000 scfm 600 hp electric, oil-free' air cotapressors and two Atlas l Copco. 1500/1200 free air 400/350 hp Diesel, Oil Free air I
compressors were used to pressurize.the primary containment.
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l The compressors were physically located outside t'ne reactor
- building. The compressed air was piped.into the reactor building-I through an existing IPCLRT Pressurizing Line. For ease of handling, l a flexible 4 inch pipe was used outside of the reactor building.
The drywell was pressurized through the "A" containment spray header 16 inch flange with an inboard valve Mo 2812-F017A open during the pressurization process.
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Pagn 6 TABLE 2 PCILRT INSTRUMENT PHYSICAL LOCATIONS INSTRUMENT ' INSTRUMENT RTD NO. EPN SUBVOLUME ELEVATION . AZIMUTH 1 1TE-CT001 9 708' 19' 2 1TE-CT002 9 724' 95' 3 ITE-CT003 9 708' 195*
4 1TE-CT004 9 724' 275' 5 ITE-CT005 6 746' 0' 6 1TE-CT006 6 750' 90' 7 ITE-CT007 6 754' 180' 8 1TE-CT008 6 758' 270*
9 1TE-CT009 5 762' 0*
i 10 1TE-CT010 5 767' 90' l 11 1TE-CT0ll 5 772' 180' l 12 ITB-CT012 5 777' 270' l 13 ITE-CTO13 4 785' 0' I 14 1TE-CT014 4 791' 90' 15 1TE-CT015 3 797' 90' 16 1TE-CT016 3 808' 270' i
17 ITE-CT017 3 811' 0' l 18 1TE-CT018 3 815' 180*
1 19 1TE-CT019 2 PO4' 115' 20 1TE-CT020 2 804' 295' 21 ITE-CT021 1 822' 0' 22 ITE-CT022 1 826' 180' 23 ITE-CT023 8 743' 0' 24 1TE-CT024 8 743' 180*
l 25 1TE-CT025 7 730' 90' l 26 1TE-CT026 7 730' 270' l 27 ITE-CT027 4 791' 270*
i 28 1TE-CT028 9 724' 75' 29 1TE-CT029 4 785' 180' 30 1TE-CT030 9 708' 75' l
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TABLE 2 (continued)
INSTRUF3NT INSTRUMENT DEWCELL NO. EPN SUBVOLUMB ELEVATION _ AZIMUTH 1 1ME-CT031 9 708' 195*
2 1ME-CT032 6 752' 0*
3 1ME-CT033 5 773' 180' 4 1ME-CT034 4 791' 0' 5 1ME-CT035 3 812' 180*
6 1ME-CT036 1 826' 30' 7 1ME-CT037 3 803' 180' 8 1ME-CT038 8 746' 270' 9 1ME-CT039 5 763' 0*
10 1ME-CT040 9 724' 75' i
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86'-8" ELEVATION VIEW OF CONTAINMENT AND SUBVOLUME LOCATIONS
Page 9 l ECTION B - TEST METHOD l
, B.1. Basic Technique l l
The absolute method of leak rate determination was used. The absolute l method uses the ideal gas laws to calculate the measured leak rate, as defined I in ANSI N45.4-1972. The inputs to the measured leak rate calculation include I subvolume weighted containment temperature, subvolume weighted vapor pressure, and total absolute air pressure. J As required by the Nuclear Regulatory Commission, in order to perform a short duration test (measured leak rate phase of less then 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />), the l measured leak rate was statistically analyzed using the principles outlined in )
BN-TOP-1, Rev. 1. A least squares regression line for the measured total time leak rate versus time since the start of the test is calculated after each new data set is scanned. The calculated leak rate at a point in time, ti, is the l leak rate on the regression line at the time ti.
The use of a regression line in the BN-TOP-1, Rev. I report is different !
from the way it is used in the ANSI /ANS 56.8 standard. The latter standard uses the slope of the regression line for dry air mass as a function of time to derive a statistically averaged leak rate. In contrast, BN-TCP-1, Rev. 1 l calculates a regression line for the measured leak rate, which is a function l of the change in dry air mass. For ANSI /ANS calculations one would expect to
! always see a negative slope for the regression line, because the dry air mass I
is decreasing over time due to leakage from the containment. For the regression line computed in the BN-TOP-1, Rev. 1 method the ideal slope is zero, since it is presumed that the leakage from the containment is constant over time. Since it is impossible to instantaneously and perfectly measure the containment leakage, the slope of the regression line will be positive or l negative depending on the scatter in the measured leak rate values obtained ;
i early in the test. Since the measured leak rate is a total time calculation, l l the values computed early in the test will scatter much more than the values j
- j. computed after a few hours of testing. :
The computer printouts titled " Leak Rate Based on Total Time Calculations" d l attached to the BN-TOP-1, R?v.1 topical report are misleading in that the l l column titled " Calculated Leak Rate" actually has printed out the regression j
! line values (based on all the measured leak rate data computed from the data 1 l sets received up until the last time listed on the printout). The calculated j leak rate as a function of time (ti) can only be calculated from data ;
available up until that point in time, ti. This is significant in that the j l calculated leak rate may be decreasing over time, despite a substantial j i positive slope in the last computed regression line. Extrapolation of the ;
l regression line is not required by the BN-TOP-1, Rev.1 criteria to terminate a !
short duration test. What is required is that the calulated leak rate be decreasing over time or that an increasing calculated leak rate be extrapolated to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The distinction between the regression line values i and the calcult.ed leak rate as a function of time is made in Section 6.4 of l BN-TOP-1, Rev. 1. Calculated leak rates, as a function of time, are corretly l printed out in the " Trends Based on Total Time Calculations" computer i printouts in Appendix B of BN-TOP-1, Rev. 1.
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- Associated with each calculated leak rate.is a statistically dsrived upper
+ confidence limit. Just as the calculated leak rate in BN-TOP-1, Rev. 1 and the statistically averaged leak rate in the ANSI /ANS standards are not the l same (and do not necessarily yield nearly equal values), the upper confidence limit calculations are greatly different. In the BN-TOP-1, Rev. I topical l report the upper confidence limit is defined as the calculated leak rate plus the product of the two sided 97.5% T-distribution value (as opposed to the one-sided 95% T-distribution used in the ANS/T.NSI standard) and the standard deviation of the measured leak rate data about the computed regression line (which has no relationship to the value computed in the ANSI /ANS standards).
There are two important conclusions that can be derived from data analyzed j using the BN-TOP-1, Rev. 1 method: 1) the upper confidence limit from the same l measured leak rate data can be substantially greater than the value calculated using the ANSI /ANS method, and 2) the upper confidence limit does not converge to the calculated leak rate nearly as quick 1 as usually observed in the ,
latter method as the number of data sets becomes large. With this in mind, the upper confidence limit can become the critical parameter for concluding a l short duration test, even when the measured leak rate seems to be well under the maximum allowable leak rate. A graphical comparision of the'two methods can be made by referring to Table 3 for the BN-TOP-1, Rev. 1 calculated leak rate and upper confidence limit and to Table 8 or the statistically averaged leak rate and upper confidence limit based on ANSI /ANS 56.8-1981. This data l I
supports the contention of many that BN-TOP-1, while it may not give the best (most accurate) estimate of containment leakage, is a conservative method of testing. !
B.2 Supplemental verification Test The supplemental verification test superimposes a known leak of i approximately the same magnitude as La (La a 385.7 SCFH or 0.6350 WT%/ day as l
defined in the Technical Specifications). The degree of detectability of the combined leak rate (containment calculated leak rate plus the superimposed, induced leak rate) provides a basis for resolving any uncertainty associated with the measured leak rate phase of the test. The allowed error band is i 0.25 La (0.159) WT %/ day)
There are no references to the use of upper confidence limits to evaluate the acceptability of the induced leakage phase of the IPCLRT in the ANS/ ANSI standards or in BN-TOP-1, Rev. 1.
B.3 Instrument Error Analysis An instrument error analysis was performed prior to the test in accordance with BN-TOP-1, Rev. 1 Section 4.5. The instrument system error was calculated in two parts. The first was to determine the system accuracy uncertainty.
The second and more important calculation (since the leak rate is impacted most by changes in the containment parameters) was performed to determine the system repeatability uncertainty. The system error analysis performed prior to the test yielded a total i'strument uncertainty of i 0.1290 Wt%/ day.
The instrumentation uncertainty is used only to illustrate the system's ability to measure the required parameters to calculate the primary containment leak rate.
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. I It is extremely importent during a short duration test to quickly idsntify s a failed sensor and in real time back the spurious data out of the calculated _ i volume weighted containment temperature and vapor pressure. Failure to do so can cause the upper confidence limit value to place a short duration test in i jeopardy. It has been station experience that sensor failures should be removed from all data collected, not just subsequent to the apparent failure, in order to minimize the discontinuity in computed values that are related to .
the sensor failure (not any real change in containment conditions). For this l test however, 3 instrument failures were encountered prior and during this l test. The effects of these failures are analyzed in Section F.5 of this l report. i 1
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- SECTION C - SEOUENCE OF EVENTS I
. '.1 c Test Preparation Chronology The pretest preparation phase and containment inspection were completed on l May 30, 1987 with no visible structural deterioration being found. Major f preliminary steps included:
- 1. Completion of all Type B and C tests, component repairs, and retests.
- 2. Completion of IPCLRT pretest valve checklist including draining and/or venting systems as described in the MP3AR.
l I 3. Blocking of four drywell to suppression chamber vacuum breakers in j the open position for pressure equalization between the drywell and suppression chand>er volumes.
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l 4. Venting of the reactor vessel to the primary containment via the l manual head vent line and the drywell equipment drain sump.
l l S. Completion of pretest data gathering system, including computer ;
j program, instrument console, and associated wiring. l l
l DATE TJME EVENT f I
5/29/87 1200 During installation of Dewcells found sensor 3 f 2ME036 (Channel 45) Bad. Decided to use one f l of two Dewcells in subvolume #3 to move up- l to subvolume #1 in place of failed sensor. I l
l l 5/29/87 1646 Deleted Channel 44 (2ME035) from Subvolume i l #3, DAS and Subconfig File (Computer l Program). All subvolumes required to have a Dewcell. Each has at least one Dewcell.
5/30/87 1055 Initial Temperature survey completed with l all sensor in-situ testing completed.
5/30/87 1100 Initial sump levels are taken.
5/30/87 1357 Inner Personnel access hatch out-of-service closed and outer personnel access hatch open. j l !
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Paga 13
- C.2 Test Pressurization Chronolooy
. DATE TIMS EVENT ]
l 5/30/87 1442 Primary Containment. Pressurization Initiated.
5/30/87 1500 Large Leak in Service Air Supply Line to RHR Line, at Flange. All Bolts were tightened.
5/30/87 1513 Service Air Leak Fixed, while containment pressurization in progress, f
'5/30/87 1940 Pressurization Terminated at 55.5 PSIA (41.28 PSIG). !
5/30/87 1945 Primary Containment Pressure Decreasing.
Looking for Leaks.
5/30/87 2100 Found Inner Personnel Access Hatch Door q l
Leaking. Preparing to close outer door. ]
5/30/87 2200 outer Door closed and Area between doors equalized with drywell pressure, f 5/30/87 2230 Resusced Pressurization. .
I i 5/30/87 2300 Pressurization Terminated at 55.543 PSIA 1 l (41.23 PSIG).
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( 5/30/87 2330 . commenced stabilization, barometric pressure I at 14.22 PSIA and Containment Pressure at 55.47 PSIA (41.25 PSIG) )
l 5/31/87 0100 Primary Containment Pressure Decreasing.
I Still Looking for Leaks.
5/31/87 0700 Due to abnormal opertion, dewcells channels 40 and 49 located in suppression pool are causing large spikes which are affecting I calculations.
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5/31/87 0909 The suppression pool air is near saturation, therefore channels 40 and 49 dowcells are i deleted and channel 37 RTD Located in l Suppression Pool will-be substituted as the suppression pool dewcell.
l 5/31/87 0937 Primary Containment Pressure decreasing, j Still looking for leaks.
l 5/31/87 2100 Air Supply Header Isolated Due to possible (
l leakage through 2E12-F017A. Spool piece l verified removed.
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Document 2816r/
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Pcg3 14 5/31/87 2100 small leak found on Transverse Incore Probe
'. (A &C) penetrations.
5/31/87 2215 Primary Containment Pressure Decreasing, still looking for leaks.
C.3 Temperature stabilization Choronology.
QSIh TIME EVENT 6/1/87 0000 DAS Timer crashed at midnight, 3 data sets were lost before timer reset was completed.
(1/2 hour) 6/1/87 0320 Large Containment Leakage was found to be past the 2RF012 and 2RF013 valves. All the sump water was drained out and the 2RF012 and 2RF013 valves were seeing primary l Containment pressure. The RE and RF suction l to the pumps were isolated (2RF023A/B and .
l 2RF067A/B) and the leakage stopped. This is allowable due to RE and RF leakage being accounted for as an unvented penetration.
6/1/87 0531 Stabilization criteria verified to be met.
C.4 deasured Leak Rate Phase PATE TIME EVENT l
6/1/87 0546 started measured leak rate phase. Base Data l I
set is #233.
i 6/1/87 1008 Due to Prime Computer Memory capability, the first 200 data sets were filed somewhere else and new base data set is now #33.
l 6/1/87 1229 The measured leak rate phase is terminated. ]
The finishing data set is 70 and the test '
duration is 6.333 hrs and tape time was 1205 hrs. The mesured 95% upper confidence limit leak rate was 0.2715 wt%/ day. ,
i C.5 Induced Leakaqe Phase DATE TIME EVENT 6/1/87 1415 The induced leak rate phase began by inducing a leakage of 381.23 SCFH (0.6450 I wt%/ day) and started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization time.
Document 2816r/
Page 15 6/1/87 1515 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization time period endsd. l
., Began 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and 15 minutes induced leak rate test. The starting data set is #88. )
l 6/1/87 1830 Induced leak rate test is completed. The )
calculated induced leakage rate was 0.7413 i wt %/ day. The measured calculated leakrate 1 (At Data Set-88) minus statistically ]
averaged Leak Rate plus induced leakage j produced a difference of 0.0537 wt%/ day 1 which was well within the units of 0.159 >
j wt%/ day. l l
c.6 Depressurization Phase ,
l DATE TJU1lL FVENT ]
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6/1/87 2030 VQ Train started in preparation for primary j containment depressurization. !
6/1/87 2055 Depressurization initiated at approximately i 8.4 lbs/hr. l l l l 6/2/87 0215 Vacuum breakers closed.
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i 6/3/87 0230 Primary containment depressurized to )
l otmosphere. l 6/3/87 0415 Drywell entry made for containment inspection. _
l 6/3/87 0515 Drywell inspection completed. No deviations I noted.
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Pags 16 SECTION D - TYPE A TEST DATA D.1 Measured Leak Rate Phase Data A summary of the computed data using the BN-TOP-1, Rev. I test method for a short duration test can be found in Table 3. Graphic results of the test are found in Figures 2-7. For comparison purposes only, the statistically averaged leak rate and upper confidence limit using the ANS/ ANSI 56.0-1981 standard are graphed in Tables 8 and Figures 16-17. A summary of the computed data using the ANS/ ANSI standard is found in Appendix F.
D.2 Jnduced Leakage Phase Data l
l A summary of the computed data for the Induced Leakage Phase of the IPCLRT
! is found in Table 4. Graphic results of the test are found in Figures 8-13.
For comparison purposes only, the statistically averaged leak rate and upper j confidence limit for the induced test using the ANS/ ANSI 56.8-1981 standard
! are graphed in Table 9 and Figures 18-19. A summary of the computed Data l using ANS/ ANSI Standard is found in Appendix F.
1 Document 2816r/
l - _ _ _ - - _ _ - _ -
Fage 17 e
MEASURED LEAKRATE' PHAGE v DATA SETS 33-70 1
i Document 2816r/
EN 00043966621 89581 8788332507768570821 875 PET 00041 7281 41 032874270789399852550206261 PDI 00051 42008751 72840639631 864321 00998877 UIM 000521 1 1 1 00009988877666655555555444442 FI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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INDUCED LEAKRATE PimSE 4 DATA SETS88-108 l
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Paga 33 I SECTION E - TEST CALCULATIONS ,
Calculations for the test were based on LaSalle County Procedure LTS-300-4. A reproduction of this computational procedure is found in Appendix D. The instrument error analyses are also found in Appendix D. In preparing for the first LaSalle Station short duration test using BN-TOP-1, Rev. 1 a number of editorial errors and ambiguous statements in the topical report were identified. These errors are presented in Appendix E and are editorial in nature only.
The Station has made no attempt to improve or deviate from the methodology outlined in the topical report.
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Paga 34 i
' I 6
EECTION F - TYPE A TEST RESULTS AND INTERPRETATION
,1
. I F.1 Measured Leak' Rate Test Results j Based upon data collected during the short Duration Test, the following results were determined:
Acceptance.
Actual Leak Rate Criterion.
(wt%/ day) (wt%/ day)
Total time raeasured leak rate 0.1120 0.476 Statistically averaged leak rate 0.0426 0.476 Upper 95% confidence l'imit leak rate 0.2715' O.476 F.2. . Induced Phase Test Results A leak of 381.23 SCFH (0.6450 wt%/ day) was induced on the primary l containment for this phase of the test. The following results were j determined:
Acceptance
, Actual Leak Rate Criterion l (wt%/ day) (wt%/ day)
Total time measured leak rate 0.7430 0.8466 0.5286 l . Statistically averaged leak rate 0.7413 0.8466 0.5286 l
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Paga 35 i
'F.3 Leek Rate Comp *nse, tion for Non-Vanted Pan'trations s ,
4 The Integrated Primary Containment Leak Rate Test was performed with the following penetrations not drained and vented as required by ,
10CFR50, Appendix J. The minimum pathway As Left Leak Rate of each l of these penetrations, as determined by Type C testing is listed: ;
P_enetration Function SCFH wt%/ day M-16 RBCCW Supply 0.30 5.1286x10-4 M-17 RBCCW Return 0.30 5.1286x10-4 ,
M-25 PCCW "A" Supply 1.04 1.7779x10-3 l M-26 PCCW "B" Supply 1.85 3.1626x10-3 M-27 PCCW "A" Supply 3.40 5.8124x10-3 ;
M-28 PCCW "B" Return 0.47 8.0348x10-4 :
M-30 RWCU Suction 0.37 6.3253x13-4 M-36 Recire Loop Sample 0.05 8.5476x10-5 ,
i M-96 Drywell Equipment Sump 16.54 2.8275x10'2 M-97 Drywell Floor Sump 0.42 7.1800x10-4 M-98 Drywell Equipment Sump Cooling 19.3 3.2994x10-2 M-22 Inboard MSIV Drain 0.74 1.2650x10-2 M-7 RHR Shutdown Cooling Suction 0.05 8.5476x10-5 M-15 RCIC Steam Supply 15.7 2.6839x10-2 ECCS/RCIC Worst Division 17.32 2.9609x10-2 ~l M-HG Unit 2 Hydrogen Recombiner 0.35 5.9833x10-4 M-34 Standby Liquid Control 0.05 8.5476x10-5 i
TOTAL 78.25 0.1340 This yields the following adjusted leakage rates:
Statistically averaged leakage rate: 0.1766 wt%/ day Upper 95% confidence limit leakage rate: 0.4055 wt%/ day F.4 Change in Drywell Sump Level There was not a change in sump level throughout the PCILRT, therefore the Measured, Calculated, and 95% Upper Confidence limit calculations were not affected.
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Pags 36 l
. i "F.5 Evaluation of Instrumtnt Failures s
Per LTS-300-4:
f Data Rejection Criteria (Reasonable Limits Check.) j If a sensor, in the opinion of the Tech Staff Engineer, is out of range, it will be ignored (i.e., set =0) and the number of operable RTD's or
'{
Dewcells in the subvolume will be reduced by one. The sensor should be ;
considered out of range if it is evident that the senor has malfunctioned. 1 Should the number of RTD's or the number of Dewcells in a subvolume become i equal to zero (accept for Subvolume, 2 and 7: Zero dewcells already) then !
with approval of the Technical Staff Supervisor, substitute the average temperature of the appropriate subvolume which is chosen based upon the j temperature survey and/or temperature distribution prior to instrument failure, f i
NOTE 1 If all RTD's in subvolume 9 are lost, then stop the test and repair the i RTD's or if the air in Subvolume 9 can be shown to be near saturation, use Subvolume 9 average Dewcell temperature.
I If all Dewcells in Subvolume 9 are lost, and the Air in Subvolume 9 can be ,
I shown to be near saturation, use Subvolume 9 average RTD temperature.
- 1. On May 29, 1987, prior to the start of test Dewcell 2ME036, channel-45 was irreversibly damaged during installation. This was just prior to the start of the primary containment integrated leak ,
rate test and spare sensors were not available. ]
- 2. On May 31, 1987, during troubleshooting with the primary containment l at 55.47 PSIA (41.2 PSIG) at approximately 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> the two i dewcells (channels 40 and 49) located in subvolume 9 (Suppression !
Pool) started spiking abnormally. Due to the abnormal spiking which )
affects the calculations (Reference Figures 14 and 15) and the Air in l Subvolume 9 being near saturation, both Deweells were deleted. All !
the RTD's were averaged and channel 38 was shown to be within a tenth j of a degree. Therefore, channels 40 and 49 were deleted and channel-37 was substituted in as a Dewcell in Subvolume 9. l The effect of these instrument failures on the instrument error is minimal. Reference Appendix D for calculated instrument errors. )
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Paga 39 F.6 Calculeted Adiusted Local Lark Rete
', The measured Type A test leak rate, plus the total leak rate compensation for non-vented penetrations, plus the sum of the adjusted local leak rates must be less than 0.75 La. The calculated adjusted local leak rates are summarized in Table F.1.
As Found Test Results l Measured 95% Upper confidence Limit 0.2715 wt%/ day Compensation For Unvented Penetrations 0.1340 wt%/ day Calculated Adjusted Local Leak Rates 0.848 wt%/ day TOTAL 1.2535 wt%/ day i 1
The total "As Found" containment leakage rate of 1.2535 wt%/ day l above the maximum allowable leakage rate of 0.75 La (0.476 wt%/s ,,). )
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i APPENDICES i
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Paga 43 APPENDIX A ,
1' TYPE B AND C TESTS Presented herein are the results of local leak rate tests conducted on all penetrations, double-gasketed seals, and isolation valves. All valves with leakage in excess of the individual valve leakage limit were restored to an acceptable leak tightness. Total leakage for double-gasketed seals and total-
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j leakage for all other penetrations and isolation valves following repairs ;
satisfied all Technical Specification 10mits. These results are listed in j Table 6. License Event Reports were submitted to document all failure
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l APPENDIX C i{
HYDROSTATIC TESTS i
i Presented herein are the results of hydrostatic leakage rate tests conducted j on isolation valves. All valves with leakage in excess of the leakage limit i (lgpm/ valve) were restored to an acceptable leak tightness. These results are f
listed in Table 7. f 1
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A 55 66 // / / // // 47 44 77 D 1 1 1 1 99 66 77 66 12 22 1 1
// // / / / / // // // // //
1 1 44 66 33 66 1 1 42 11 4 4
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00 5 5 5 00 00 1 2 00 42 00 00 00 00 S
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EA 55 // 87 / / // // / 7 44 77 LD 1 1 88 1 1 66 1 1 66 62 22 1 1
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S A
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) T 00 00 44 4 4 44 66 55 55 00 SA 00 00 00 00 00 00 00 00 00
( R FF FF FF FF FF FF FF FF FF ET - - - - - - - - - - - - - - - - - -
VE 1 1 22 22 22 22 1 1 22 22 22 LN 22 22 1 1 1 1 1 1 55 1 1 1 1 1 1 AE EE EE EE EE EE EE EE EE EE VP 22 22 22 22 22 22 22 22 22 l
7 6
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7 7 7 7 7 7 E 7 7 8 8 8 8 8 8 T 8 8 / / / / / /
A / / 3 3 0 0 0 0 D 8 7 1 1 3 3 3 3
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5 1 1 1 3 3 3 4
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S 0 0 0 0 0 0 0 0 EA
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_ KE 8 7 8 8 8 8 8 7 AT / 8 / / / / / 8
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S A 0 0 0 0 0 0 0 0 E E
_ L T B
_ ACI T T
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E n n n o o o o o
M o o n i i i i U i i i o t t t t L t t t i a a a a O a a a t l l l l V l l l a o o o o
_ o o o l s s s s T s s s o I I I I S I I I s E I e e e e T e e e r r r r r r r e u u u u
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_ P w w w w w w w o o o o o o o w L L L L L L L o L B B B B
_ S S C
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_ P P C H H H H H H R R R L R R R RN OO AB BBB BBBB BBBB BBB I 1 1 281 2453 1 9 66 4 84 451 1 331 l 4 57
) T 01 1 1 3 1 1 1 2 31 3 3 086 751 1 751 l 222 SA 00000 0000 00 00 000 0030 0030 000
( R FFFFF FFFF FF FF FFF FFFF FFFF FFF ET - - - - - - - - - - - - - - - - - - - - - - - - - - -
VE 1 1 1 1 1 2222 1 1 22 222 2222 2222 222 LN 22222 2222 55 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 AE EEEEE EEEE EE EE EEE EEEE EEEE EEE VP 22222 2222 22 22 222 2222 2222 222
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R A 0 0 0 0 0 0 0000 7 T S
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) T 22 0 0863 1 751 1 751 222 1 1 1 1 SA 00 3 0000 0003 0003 000 0000
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VE 22 2 2221 2 2222 2222 222 3333 LN 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3333 AE EE E EEEE EEEE EEEE EEE BBBB VP 22 2 2222 2222 2222 222 2222
Pag:n 69 APPENDIX D CALCULATIONS ,
The following are the computations made to determine the instruments used ,
during the IPCLRT. Also included is a reproduction of the computational j procedures used during the IPCLRT. i INSTRUMENT ERROR ANALYSIS (INITIAL AND FINAL) (
t = Test duration (hours) = 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> '!
LA = 0.635%/ day j 0.25 LA = 0.159%/ day PA = Containment Absolute Test Pressure = 55.2 PSIA T = Containment Air Temperature (*R) = 550'R TDEW = Containment Atmosphere Dew Point ('F) .
PV = Containment atmosphere partial pressure of water vapor (psia) l, f
Pressure - Total Absolute Pressure i
N = Number of pressure gauges used j E = Sensor Sensitivity = (% Accuracy) (PA) l I
c = Measurement System Error = (% Repeatability) (full scale) j ep = i [(E2 + c2)/N) 1/2 ;
(Initial and Final) ep = 1 0.0058974 PSIA Water vapor Pressure l
N = Number of dewcells used E = Sensor sensitivity = i (% accuracy) (vapor pressure /Toew -32) c = Measurement System Error = 1 Repeatability e py = i [(E2 + c2)/N] 1/2 (Initial) epv = 1 0.010824 PSIA j (Final) epv = 1 0.0114806 PSIA I
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Paga 70 j
' ILRT CALCULATIONS 4
Temperature N = Number of RTD's used B = Sensor Sensitivity = 1 Accuracy I = Measurement System Error = 1 Repeatability 1 2
eT = i [(E 2 + I )/N] 1/2 i (Initial) e7 = 1 0.0258199 'F.
(Final) eT = 1 0.0262613 'F.
i ISG t = Test Duration in hours ISG = 1 2400 2 ep\2+2[ep +2[eT 1/2 t
PA/ {P (T
- 1. (INITIAL) ISG =1 0.1290805 wt%/ day.
- 2. (Final) ISG = 1 0.1349968 wt%/ day.
The above initial and final (1 and 2) ISG calculations are within 0.25 La (0.159 wt%/ day).
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Pags 71 9
.BN-TOP ILRT CALCULATIONS A. Average Subvolume Temperature and Dewpoint Tj = I all RTD's in,the ith subvolume *F nunser of RTD's in the jth subvolume DPj = I all dewcells in the ith subvolumo *F number of dewcells in the jth subvolume Where: Tj = Average temperature of the jth subvolume DPj = Average dewpoint of the jth subvolume j NOTE by definition DPj < Tj i
If Tj and DPj is 0 or undefined see Page 79. j B. Volume Weighting Factors VFj = VOLi TVOL WHERE: VFj = volume weighting factor for the jth subvolume VOLj = volume of the jth subvolume TVOL = total containment volume C. Average Containment Volume Weighted Temperature NVpL T =
t,t, (VFj)(Tj)
J=1 WHERE:
T = Average Containment volume weighted torperature (*F)
NVOL = number of subvolumes D. Average containment volume Weighted Dewpoint Temperature DP = (VFj)(DPj)
J=l l
i
! WilERE:
l l DP = Average containment volume weighted dewpoint temperature (*F) l l
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BN-TOP ILET CALCULATIONS E. Average Containment Volume Weighted Vapor Pressure Pv = (218.167)(14.696) I e(EXPON LN 10) f WHERE:
l EXPON = X(A+ZX+CX8)
DP (1 + DX)
'K conversion = 273.16 + DP-32 !
1.8 l A = 3.2437814 ,
Z = 5.86826 x 10-8 l C = 1.1702379 x 10-8 D = 2.1878462 x 10-8 f X = 647.27 - DP i PV = Average containment volume weighted vapor pressure (PSIA) I F. Primary Containment Absolute Total Air Pressure l
P(total) = P1 + P2 2 -
WHERE:
1 P1,P2 = M1,M2 x COUNTS 4 Cl,C2 1000 M,C are constants determined during calibration i COUNTS = Pressure gauge output P(total) = Primary Containment absolute totel air pressure G. Primary Containment Absolute Dry Air Pressure P = P(total) - PV )
l WHERE: J l
l P = Primary Containment absolute dry air pressure (PSIA) 1 l
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'< EN-TOP ILRT CALCOLATIONF'
,. Y. .
t H. Mass of Contained Alt
~- o ' <
s k W= EV Ideal Gas Law RT )
i i i WHERE: l l
V = Primary Containment free air voltme (ft)'which consists of: i 1
- a. Drywell free volume (229,538 ft) 1 In suppression Pool free volume (165,100 ft) i 1
V = 394,638 ft (FSAR value) !
R = Gas constant for air = 53.35 ft lb/lbm R l MW = Molecular weight of air = 28,97 l W = Mass of contained air ]
W= 144 PV 53.35 (T + 459.70)
NOTE ]
l: The Suppression Pool volume changes 447.0 ft/in.
I i
The Reactor Vessel v31ume changes 29.3 ft/in. (accurate only to RX vessel flange at 215.5")
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BN-TOP METHOD TEST CALCULATIONS 4
A. Measured Leak Rate (total time) !
From BN-TOP-1 Revision 1, Section 4.5 the following equation is given for the measured leak rate using the total time procedure:
, e l
'*' = 2400 1-1951_ [1] l ti TiPo j
- l WHERE:
Mi = Measured leak rate in weight % per day for the ith data point ti - Time since the beginning of the test period to the ith data point in hours To, Ti = mean volume weighted containment temperature at the beginning of the test and at the ith data point (R) i l Po, Pi = mean absolute calculated dry air pressure at the beginning of the test atLat the ith data point (PSIA)
( Using the following relationship derived in ANSI N45.4-1972 Appendix B given below:
l Wo - Wi =
1 - To Pi [2]
Wo Ti Po l
WHERE:
l l Wo,Wi = dry air mass of the containment at the beginning of the test and at l the ith data point
(
1 1 And substituting this relationship into equation [1] yields the following ,
I expression for the measured leakage: j i
Mi = 1400 ~Wo-W1} [3] ;
ti , Wo l l
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Pags 75 i
BN-TOP METHOD TEST CALCULATIONS I B. Calculated Leak Rate The method of Least Squares is a statistical procedure for finding the "best fit" straight line, commonly called the regression line, for a set of measured data such that the sum of the squares of the deviations of each measured data point from the straight line is minimized.
To determine the calculated leak rate (Li) at time ti, the regression line .
is determined using the measured leak rate data from the start of the test I to time ti, the calculated leak rate is the point on this line at time ti.
Li = Ai + (Bi)(ti) [4]
Using differential calculus, the numerical values of Ai and Bi that will minimize t'ne num of the squares of the deviations can be shown to be:
Ai = ([Mi) ([112) - ([ti) ([tiMi)
, , m
[5]
n((ti2) - ((ti)*
Bi=_n(t_igi - (kti) (Igi) [6]
n((ti2) - (di)2 1
l Vl!ERE :
1 I na number of data sets to time ti I l
Equations [5] and [6] are referred to as the Least Square equations and l are used by the computer program to compute the calculated leak rate for i the Total Time and Point to PGint calculations. !
l Confidence Limits C.
Even though the regression line is statistically determined to minimize the sum of the squares of the error, the values of the calculated leak l rate cannot be considered to be exactly correct. If the containment integrated leak rate test were run a number of times, under the same conditions, the calculated leak rates would be close in value but not exactly the same each time.
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t j BN-TOP METHOD TEST CALCULATIONS l However, based on statistics we can establish confidence limits associated I with the regression line such that the limits of the calculated leak rate j computed would successfully enclose the true value of the desired j L parameter a large fraction of the time. This fraction is called the 1 l confidence coefficient and the' interval within the confidence limits is j the confidence interval. j confidence limits for the integrated leak test computer program are determined based on a confidence coefficient of 95%. This means that the )
probability that the value of the calculated leak rate will fall within j the upper and lower confidence limits, or confidence interval, is 95%. j To determine the value of the confidence limits the following statistical information is required: the variance, standard deviation, and the l Student's T-distribution.
i The variance, as the name implies, is a measure of the variability of i individually measured data points from the mean, or in this case, from the j regression line. The variance of the measured leak rate (Mi) from the r calculateC leak rate (Li) is given by: i I
s' - sso [7] ,
n-2 l l
Where s is the variance and s is the standard deviation based on (n-2) degrees of freedom. SSQ is the sum of the squares of the deviations from j the regresssion line and is mathematically expressed below: 1 Ssg = I(Mi-Li)2 [8]
The standard deviation has more practical significance since computing the standard deviation returns the measure of variability to the original units of measurement. Additionally, it can be shown that given a normal distribution of measurements, approximately 95% of the measurements will fall within two standard deviations of the mean.
The number of standard deviations either side of the regression line which establish a 95% confidence interval are more accurately determined using a statistical table called a " Table of percentage Points of the T-distribution" and provide increased confidcence in outcomes for small and large sample sizes.
Since we are interested in reporting a single value of calculated leak rate based on measurements taken over a specific time period, an additional factor is applied to the formula for computing the variance and hence, the standard deviation.
Document 2816r/
I Pags 77 )
t i BN-TOP-METHOD TEST CALCULATIONS l
- I The Table of T-distributions has been formulized for use by the computer )
program as follows:
T = 1.95996 + 2.37226 + 2.8225 [9] )
(n-2) (n-2)8 WHERE: the value of T is based on 95% confidence limits and (n-2) degrees of freedom.
).
The application of the additional factor to the variance formula yields: I
~
- T c8 =s 8 1+ 1 .+ (to - t)2 [10] I
. 1 n (ti - t)2 l
WHERE: l tp = time from che start of the test of the last data set for which the standard deviation of the measured leak rates (Mi) from the 1 regression line is being computed. I l
ti = time from the start of the test of the ith data set l l
n = number of data sets to time tp l l
l
= 1
- and [14] l i=1 l
1 t = 1 ti l j
Taking the square root of equation [10] yields the standard deviation:
' ~
F _
o=s i l+ 1 + (to - t)2 [12]
l n (ti - t)2 a
The upper and lower confidence limits can now be determined, the confidence limits being equal to T standard deviations above and below the regression line. Combining equations-[10] and [11] yields:
Document 2816r/
Page 78 9
+
BN-TOP METHOD TEST CALCULATIONS
+ i Confidence limits = L + T
- a [12]
or j UCL = L1 + T
- a [13]
LCL = Li - T
- a [14] .
WHERE: UCL and LCL are the upper and lower confidence limits respectfully.
WHERE: Li = Calculated Leak Rate at Time ti T-Distribution value be ed on n, the number of data sets f
T =
received up until time ti.
a = Standard deviation of Measure Leak Rate (Mi) values about the regression line based on data from the start of the test until time ti. ,
I Equation [13] and [14] are used by the computer program to compute the 95%
confidence limits for both the Total-Time and Point-to-Point calculations, l
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Cr. Data Rejection Criteria (Reasonable Limits Check.)
- 1. If a sensor, in the opinion of the Tech Staff Engineer, is out of range, it will be ignored (i.e., set =0) and the number of operable RTD's or Dewcells in the subvolume will be reduced by one. The sensor should be considered out of range if it is evident that the sensor has malfunctioned. All rejected data should be maintained if possible and the reason for rejection documented in the Events log.
Should the number of RTD's or the number of Dew cells in a subvolume become equal to zero (accept for Subvolume, 2 and 7: Zero dewcells already) then with approval of the Technical Staff Supervisor, i substitute the average temperature of the appropriate subvolume which is chosen based upon the temperature survey and/or temperature distribution prior to instrument failure. Document in Event 3 Log (Attachment C).
NOTE l i l If all RTD in subvolume 9 are lost, then stop the test and repair j i
the RTD's or if the AIR in Subvolume 9 can be shown to be near l saturation, use Subvolume 9 average Dewcell temperature. I l
If all newcells in Subvolume 9 are lost, and the Air in Subvolume 9 can be shown to be near saturation, use Subvolume 9 average RTD
( temperature.
l l 2. If a pressure gauge is out of the range of 14 < P (psia) < 50 the j pressure gauge will be ignored (set =0).
i l NOTE Requirements of Attachment J.19 will be met.
l NOTE All Data should be recalculated with bad element (s) deleted.
l 3. Raw temperature, pressure, and dew point data should not be rejected I statistically, but may be rejected and not used in the final calculations provided there is a good physical reason for the l rejection. Data rejected, including the cause or probable cause for I the bad data, are to be documented. If the validity of certain data is suspect, but no physical reason is found, then a statistical rejection technique may be applied. (See ANSI /ANS 56.8-1981, for Data Rejection Criterion). A data point may be rejected if it is I
expected to occur statistically less than 5% of the time. The statistical rejection of more than 5% of a set of data should not be allowed.
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! Page 80 l l t i DEFINITIONS j
A. Maximum Allowable Leak Rate (Lg) at pressure Pa (39.6 psig)
I La = 0.635% of containment volume per day ;
= 0.00635 x 394,638 ft 3/24 hr
= 2506 ft 3/24 hr
= 104.4 ft 3/hr !
= 104.4 (39.6 + 14.71 = 385.7 SCFH 14.7 I
B. Maximum Allowable Operational Leak Rate (L T ) at pressure Pg (39.6 ,
l psig) [
LT = 0.75 La
= 0.75 (.635%/ day)
= 0.476%/ day
= 289.3 SCFH 1
1 C. Maximum Allowable Total Type "B" and "C" tests (L 1)
L1a 0.60 La
= 0.60 (.635%/ day)
= 0.381%/ day ,
= 231.4 SCFH I
! 1 D. Induced Leak Rate Acceptance Criteria l l
Lo = superimposed flowmeter leak rate (%/ day)
Le = induced measured leak rate during verification test I
(%/ day)
]
L3 = statistically averaged leak rate from short duration ;
or 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test (%/ day) '
lLc - L o- L l ss 0.25 LA
$ 0.25 (.635%/ day) l
$ 0.159%/ day
$ 96.43 SCFH Document 2816r/
APPENDIX E PAGE-81 1
3 BN-TOP-1,' REY. 1 ERRATA.
The Cossaission has approved short duration testing for the IPCLRT provided the Station uses the general test method outlined in the BN-TOP-1, Rev. 1 topical repert. The primary difference between that method and' the ones )
previously used is in the statistical analysis of the measured leak rate data. ]1 Without making any judgments concerning the validity of this test method, l certain errors in the editing of the mathematical expressions were discovered. f The intent here is not to change the test method, but rather to clarify the j method in a mathematically precise manner that allows its implementation. The d '
errors are listed below.
EQUATION 3A, SECTION 6.2 Reads: Lg=A+8tg j Should Read: Lg=Ag tB gt g Reason: The calculated leak rate (L ) at time t is computed B
using the equations regression 6 and 7). line e notants Aequation
,gThesummationsi 6 are a
defined as I = 1, where n is the number of data sets up until i=1 time t The regression line constants change each time a newdaka. set is received. The calculated leak rate is not a linear function of time.
PARAGRAPH FOLLOWING EQ. 3A, SECTION 6.2 Reads: The deviation of the measured leak rate (M) from the calculated I leak rate (L) is shown graphically on Figure A.1 in Appendix A I and is expressed as:
Deviation = M g -L g Should Read: The deviation of the measured leak rate (M ) from the regression line (N ) is shown graphically on Figure A 1 in Appendix A and is expresskd as:
Deviation = M g -N g j
-where N =A +B *t g, p
A,B = Regression line constants computed from all data P P sets available from the start of the test to the last data set at time t p, t
g
= time from the start of the test to the ich data set.
I PAGE 82 1
, R :ses: The c:1culet:d lock rato os a functies of time duri23 the test is b:s:d on a r:gr:ssien lina.
The regression line constants, A and B , are i
changing as each additional data set is received.
Equation 3A is used later in the test to cearpute the upper confidence limit as a function of time.
For the purpose of this calculation, it is the deviation from the last computed regression Itne at time t that is.important.
p EQUATION 4, SECT' q .6J l Reads: SSQ = I (M g - L g)2 Should Read: SSQ = I (M g - Ng)2 ,
Reason: Same As Above j i
EQUATION 5, SECTION 6.2 !
Reads: SSQ = I ( M g - (A + Btg))2 j Should Read: SSQ = I ( M g -
(A p + Bp
- t g)]2 l Reason: Same As Above l
EQUATION ABOVE EQUATION 6, SECTION 6.2 Reads: B = ("i
~
)("i ~
)
1(t g - t)3 Should Read: Bf n II(t ~ t)(H - 5)}
i i j
I(t g -
t)3 Reason: Regression line constant B changes over time (as 4
l a function of e ) as each 3dditional data set BErof"t" left out of denominator.
is received. I Summation signs omitted.
EQUATION 6, SECTION 6.2 d
Reads: B="Iti i
~
(I ti) (I M ) i n It g 3 - (I e g)3
~
M (I t i ) (I M 1)
Should Read: B g
a"Iti i l n It 3 -
(I e )3 Reason: Same As Above
PAGE 83
.' EQUATION 7. SECTION 6.3 Reads: A=5-Bt Should Read: A g=5-S g t Reason: Same As Above EQUATION 10, SECTION 6.2 Reads: A=( i} ( i
}~( Di ) (I D i
0) 1 h
nit 3g - (I tg)3 Should Read: A i=( i) ( *i }~( "i) ( "i "i) nit 3g - (I e )3 Reason: Same As Above EQUATIOP 13, SECTION 6.3 Reads: c2 ,2 [g , 1"
, (t,
- C)* )
(eg - t)2 Should Read: c2 32 [3 +* 1, (t,
- M I I (t g- T)h where t = time from'the start of the test of the last data E
set for which the standard deviation of the measured leak rates (M 1 ) from the regression line (N g ) is being computed; t = time from the start of the test of the 1" data set; o = number of data sets to time t p; n
I = I ; and ist T3 Ie.
l Reason: Appears to be error in editing of the report. l Report does a poor job of defining variables. l
)
PAGE 84
[ EQUATION 14. SECTION 6.3 Reads: a= s ( 1 + 1 + Ct p ~ t )* ]
(tg - t)3
.Should Read: a= s ( 1 +"1 + (tp * * )* }
I (t g -
'ii)2 Reason: Same As Above EQUATION 15. SECTION 6.3 .
Reads: Confidence Limit = L 2 T I
Should Read: Confidence Limits = L 2 T x a where L = calculated leak rate at time e ,p T= T distribution value based on n, the number of I data sets received up until time e p; a= standard devist. ion of measured leak rate values (M ) about the regression line based on data from q th start of the cast until time t p .
i Reason: Same As Above I
EQUATION 16, SECTION 6.3 f Reads: UCL = L + T Should Read: UCL = L + T
- a Reason: Same As Above .
EQUATION 17, SECTION 6.3 i
Reads: LCL = L - T l Should Read: LCL = L - T
- a Reason: Same As Above
Page 85 9
4 APPENDIX F MASS-PLOT (ANS/ ANSI 56.8) METHOD 1 LEAK RATE RESULTS l.
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