ML18057A924

Reactor Containment Bldg Integrated Leak Rate Test, Feb 1991,Special Rept.

ML18057A924
Person / Time
Site:	Palisades
Issue date:	02/28/1991
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
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ML18057A923	List: ML18057A922 ML18057A924
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NUDOCS 9105310101
Download: ML18057A924 (19)

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• ATTACHMENT Consumers Power Company Palisades Plant Docket 50-255 Special Report

• REACTOR CONTAINMENT BUILDING INTEGRATED LEAK RATE TEST February 1991 Prepared by: Consumers Power Company March 1991 May 17, 1991 ( 9105310101 ADOCK 0 21 Pages e -PALISADES NUCLEAR PLANT REACTOR CONTAINMENT BUILDING INTEGRATED LEAK RATE TEST TABLE OF CONTENTS 1.0

SUMMARY

. . . . .

I. I INTRODUCTION

1.2 RESULTS

2.0 DISCUSSION . 2.1 ANALYSIS TECHNIQUES 2.2 DATA ACQUISITION . . 2.3 CONTAINMENT CONDITIONS

3.0 CONCLUSION

S

4.0 REFERENCES

5.0 ATTACHMENTS

Graph 1 -AVG RTD Graph 2 -AVG HUM. SENSOR Graph 3 -AVG PRESSURE GAUGE Graph 4 -CONTAINMENT MASS Graph 5 -BN-TOP-1 (DATA PLOT) Graph 6 -MASS PLOT METHOD FIGURES Graph 7 -CONTAINMENT MASS VERIFICATION Graph 8 -TOTAL TIME VERIFICATION Graph 9 -AVE PRESSURE GAUGE Graph 10 -AVE PRESSURE GAUGE TABLES Table 1 -Summary of Local Leak Rate Tests Since 1988 ILRT Table 2 -Summary of Palisades Containment Leak Rate Tests 1 1 1 2 2 3 3 4 4 5 Page 1 of 5 1.0

1.1 INTRODUCTION

On February 16, 1991, Palisades Nuclear Plant, owned and operated by Consumers Power Company, successfully completed its sixth Type A Containment Integrated Leak Rate Test, and its first short duration full pressure test. The Containment Integrated Leak Rate Test was completed in conjunction with a Structural Integrity Test, tated by the replacement of the steam generators inside containment.

A history of the past Type A tests is given in Table 2. In addition, the results of all Type B and C Local Leak Rate Tests conducted since the November 1988 Type A test are listed in Table 1. Palisades containment is a steel-lined, steel reinforced concrete structure with a net free volume of 1,640,000 cu. ft. As a result, the containment air mass is essentially free from short-term daily changes in ambient conditions, including diurnal effects. The structure has a design pressure of 55 psig and a calculated accident peak pressure of 54.68 psig. 1.2 RESULTS In accordance with 10 CFR 50, Appendix J, Consumers Power Company conducted a full pressure, short duration Type A Containment grated Leak Rate Test commencing with pressurization on February 12, 1991 and concluding with depressurization on February 17, 1991. The test was conducted in conjunction with the Structural Integrity Test (SIT) which was necessitated by modifications to containment during replacement of the steam generators.

The hold test lasted 14.75 hours8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br /> utilizing the BN-TOP-1 test criteria, as permitted under our most recent Palisades Nuclear Plant Technical Specifications.

The air mass at the beginning of the test was 594150.8 lbs at a test pressure (Pa) of 55.61 psig. The measured containment leak rate (Lam) for the 14.75 hour8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br /> hold test was 0.02473 wt %/day and the BN-TOP-1 upper 95% confidence level (UCL) was 0.0700838 wt %/day. The addition of Type B and C penalties result in a calculated "as left" total containment leak rate of 0.070439 wt %/day at Pa. Referencing 10 CFR 50, Appendix J, Section III.A.5.b.l, the maximum acceptable leak rate for a Type A test at the accident pressure (Pa) of 55 psig, is 0.075 wt %/day (0.75 La), including the corrective additions to account for omitted systems and the containment free volume changes. This criterion was met in the Type A "as left" test condition.

As a result, the Palisades Nuclear Plant was allowed to return to operational status. After the hold test was completed, a controlled leakage (Lo) of 5.5 scfm or 0.10023 wt %/day was imposed on Lam, as a verification test as suggested by N45.4-1972 and 10 CFR 50, Appendix J, for a period of 8.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> including a 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization.

The composite leak rate (Le) for the verification was then measured at 0.12213 wt %/day. The BN-TOP-1 criteria states that Le shall be bound by Lam + Lo + 0.25 La, where La is the maximum allowable leak rate at test pressure.

Those limits are 0.09996 and 0.14996 wt %/day Page 2 of 5 inclusive.

Le (0.12213 wt%/day) does indeed fall between those limits, and thus the Type A leak rate does meet the requirements and is verified.

The Type C additive corrections for containment pressure boundary systems that were not exposed to the test pressure and were added to the Type A test results (to obtain the Type A "as left") were: Penetration No 15 17 36 44 48 52 66 Penetration Description Component Cooling Water in CV-0911 and CV-0940 Containment Pressure Instrument Line Letdown to Purification Ion Exchange (CV-2009)

Controlled Bleed-off from PCP's Containment Pressure Instrument Line Containment Sump Drain Line ILRT Instrument Line Leak Rate (SCCM) 9.3 165.1 155.2 82.9 129.2 0.0 9.9 Total Untested Leak Rate 551.6 The conversion of 551.6 seem to wt%/day equals 3.548 x 10-4 wt%/day. 2.0 DISCUSSION

2.1 ANALYSIS

TECHNIQUES A preoperational temperature and dewpoint temperature survey provided the initial results used in calculating the weighting factors assigned to each subvolume, based upon the number of both temperature and humidity sensors used in each. Because the temperature sensors are direct reading, they require no conversions to calculate the average temperature in containment.

The humidity sensors do, however, require a mathematical conversion completed within the computer program to produce the average containment vapor pressure.

The difference between the absolute pressure in containment and the average vapor pressure produces the containment dry air partial pressure.

The dry air partial pressure and the weighted average containment temperature are then used to compute the mass of the containment air.

Page 3 of 5 The absolute method was used to conduct the containment leak rate test. Measurements were recorded every 15 minutes and the data used to compute the leak rate by the total time method and applying the BN-TOP-1 criteria for a short duration test as allowed under the Palisades Plant's Technical Specifications.

In the total time method of analysis, calculations are based on the most recent data and the start of test data. Each successive leakage computation is then based on a correspondingly longer time period. Each computation is least squares fit to a straight line until the duration of the test is sufficient to establish that the containment conditions are stable, a definite data trend is apparent, the test data are consistent, the extrapolated leakage rate and the upper 95% confidence level (UCL) is within the allowable limits as set forth in BN-TOP-1.

2.2 DATA ACQUISITION The instrumentation system consisted of a sensor package of (26) Resistance Temperature Detectors (RTD's), ten (10) humidity sensors, and two (2) quartz manometer pressure gauges. Measurements from the sensors were used to determine the average dry bulb ture, humidity (for conversion to vapor pressure) and the containment pressure.

All sensors were given an in-situ calibration check prior to the test. The sensors located within containment were connected to a multiplexer package (also located within containment) which provided signal conditioning.

The multiplexer then scanned each sensor channel and transmitted the data through the electrical penetrations to a data-logger.

The data-logger provided the following functions:

1. Test timing and scan command signal to the multiplexers at the appropriate time. 2. Data recording from the multiplexers and pressure gauges. 3. Data transmission to the two computers used for leak rate computation and other data manipulation.

The computers perform the following functions:

1. Records and reduces the raw data into weighted averages, vapor pressures, and containment pressure necessary for computing the containment leak rates. 2. Calculates the leak rate in wt %/day using the total time method. 3. Determines the 95% upper confidence limit (UCL) using the BN-TOP-1 criteria.

4. Provides plots of individual test parameters as well as containment average temperature, vapor pressure and containment mass as a function of time. 5. Provides plots of containment stabilization criteria, leak rates during hold and verification tests, as well as pass/fail criteria.

Page 4 of 5 2.3 CONTAINMENT CONDITIONS The average temperature in containment fulfilled the requirements for stabilization contained in ANSI 56.8 and Palisades Procedure RT-36, and was declared stable on February 15, 1991 at 14:30, 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and 45 minutes after pressurization was completed.

The hold test was declared at that time. The containment mass was 594150.8 lbs mass, and an average temperature of 60.43 degrees F. was measured in containment.

The average containment pressure was measured at 55.61 psig. The end of the hold test was declared at 0515 on February 16, 1991, 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> and 45 minutes after the start. The test parameters have been plotted to illustrate the average test conditions within the containment throughout the hold test as shown in Figures 1 through 4. Figure 5 illustrates the containment leak rate using the BN-TOP-1 criteria.

In addition to the actual leak rate, a measured leak of 5.5 scfm was imposed on the containment immediately after the end of the hold test. The containment was allowed to stabilize.

The verification test was initiated at 0630 on February 16, 1991 and was concluded at 1400 on the same day, 7 1/2 hours after the start. The Type A test was verified after meeting the acceptance criteria as set forth in BN-TOP-1 and Palisades Procedure RT-36.

3.0 CONCLUSION

S 3.1 The Palisades containment structure leak rate satisfied the acceptance criteria stated in RT-36, paragraph 6.3 for the Type A "as left" test. 3.2 The verification test results verified the hold test results, and met the acceptance criteria as found in Palisades Procedure RT-36, paragraph 6.3. 3.3 The calculated instrumentation selection guide (ISG) fulfilled the acceptance criteria of Palisades CILRT Procedure RT-36, paragraph 5 .1. 2.

4.0 REFERENCES

4.1 Consumers

Power Company, "Palisades Nuclear Plant, Special Report No 13, Reactor Containment Building Integrated Leak Rate Test." 4.2 ANSI/ANS 56.8-1987, "American National Standard Containment System Leakage Testing Requirements." 4.3 10 CFR 50, Appendix J. 4.4 Palisades Technical Specifications, Sections 3.6.l, 3.6.2, 4.5.1. 4.5 Palisades CILRT Procedure RT-36, Revision 15. 4.6 NRC INFORMATION NOTICE 85-71: Containment Integrated Leak Rate Tests. 4.7 ANSI 45.4-1972, "American National Standard Leak Rate Testing of Containment Structures for Nuclear Reactors."

Page 5 of 5 4.8 Criteria for Integrated Leak Rate Testing of Primary Containment Structures for Nuclear Power Plants, BN-TOP-1, Revision 1, November 1, 1972. 5.0 ATTACHMENTS

5.1 FIGURES

Figure 1 11 AVG RTD" Figure 2 11 AVG HUM. SENSOR" Figure 3 11 AVG PRESSURE GAUGE 11 Figure 4 "CONTAINMENT MASS 11 Figure 5 11 BN-TOP-l DATA PLOT" Figure 6 "MASS PLOT METHOD" Figure 7 "CONTAINMENT MASS VERIFICATION" Figure 8 "TOTAL TIME VERIFICATION 11 Figure 9 "AVE PRESS GAUGE 11 {TIME LINE) Figure 10 11 AVE PRESS GAUGE" {TIME LINE) 5.2 TABLES Table 1 "Historical Summation of Local Leak Rates Since 1988 11 Table 2 "Summary of Palisades Containment Integrated Leak Rate Tests" 61 0008 60.6000 60.2000 DEG. F 59.8000 59.4000 AUG RTD PALISADES SIG CILRT-1991

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SUMMARY

OF PALISADES CONTAINMENT INTEGRATED LEAK RATE TESTS (Ltm) Measured Leak Rate at Pt (wt %/day) NA 0.0233 0.0342/0.0436*

-0.0071/0.0020*

0.0924 0.0328/0.0349*

0.0157/0.0187*

0.01651/0.01758*

NA (Lam) Measured Leak Rate Adjusted to Pa (wt %/day) 0.0048 0.0327 0.0479/0.0611*

0.0027* 0.1295/0.1422*

0.0507* 0.1175 0.0290* 0.1061* 0.02617* 0.0408* 0.02473/0.07008*

0.073017*

(0. 75 La) Plant Tech Spec Limit @ Lam (wt %/day) 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 Comments Pre-operational Pre-operational "As Left" Leak Rate "As Left" Leak Rate "As Found" Leak Rate Lam is "As Left" Ltm is w/o penalties "As Found" Leak Rate Lam is "As Left" Ltm is w/o penalties "As Found" Leak Rate Lam is "As Left" Ltm is w/o penalties "As Found" Leak Rate Lam is "As Left" Lam is w/o penalties "As Found" Leak Rate *Indicated data is the calculated 95% upper confidence limit (UCL). **02/91 CILRT was in conjunction with structual integrity test (SIT).