ML13317B189

Reactor Containment Bldg Integrated Leak Rate Test, Final Rept

ML13317B189
Person / Time
Site:	San Onofre
Issue date:	02/28/1991
From:	Southern California Edison Co
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ML13317B188	List: ML13317B187 ML13317B189
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NUDOCS 9105220214
Download: ML13317B189 (13)

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SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION UNIT 1 REACTOR CONTAINMENT BUILDING INTEGRATED LEAK RATE TEST FINAL REPORT FEBRUARY 1991 TEST 9105220214 910516 PDR ADOCK 05000206 P

PDR

SONGS 1 1991 ILRT TEST REPORT PAGE 2 TABLE OF CONTENTS

1.0 INTRODUCTION

3 1.1 GENERAL 3

1.2 TEST SYNOPSIS 3

1.3 DOCUMENTS AND TEST INFORMATION RETAINED AT SONGS 5

2.0 GENERAL DATA (PLANT INFORMATION) 5 3.0 TECHNICAL DATA 6

4.0 TEST DATA

SUMMARY

6 5.0 VERIFICATION TEST DATA

SUMMARY

7 6.0 LOCAL LEAK RATE TEST DATA

SUMMARY

7 6.1 PENETRATIONS NOT ALIGNED TO SIMULATE POST-ACCIDENT CONDITIONS 7

6.2 AS FOUND / AS LEFT LLRT PENALTY 8

7.0 ANALYSIS AND INTERPRETATION 9

7.1 PRESSURIZATION 9

7.2 CONTAINMENT ATMOSPHERE STABILIZATION 9

7.3 ILRT (Total Time) 9 7.4 ILRT (Mass Point) 10 7.5 IMPOSED LEAKAGE RATE VERIFICATION TEST 11 8.0 LOCAL LEAK RATE TESTING

SUMMARY

13

SONGS 1 1991 ILRT TEST REPORT PAGE 3

1.0 INTRODUCTION

1.1 GENERAL The reactor containment building Integrated Leakage Rate Test (Type A) was performed to demonstrate that the overall leakage rate through the primary reactor containment system does not exceed the allowable leakage rate as specified in the Unit 1 Technical Specification, Section 4.3.1.

The test was performed as part of the Unit 1 Cycle 11 refueling outage.

The successful Type A and supplemental verification tests were performed in accordance with the requirements of San Onofre Nuclear Generating Station, Unit 1, Procedure SO1-V-1.3, Revision 14, Sphere Integrated Leak Rate Test. The test method utilized was the absolute method described in ANSI N45.4-1972, "American National Standard Leakage-Rate Testing of Containment Structures for Nuclear Reactors"; and ANSI/ANS-56.8-1987, "Containment System Leakage Testing Requirements".

The leakage rate was calculated using the Total Time formulae and Mass Point method from these standards. Test duration was determined from these standards and from Bechtel Topical Report BN TOP-1, Testing Criteria for Integrated Leakage Rate Testing of Primary Containment Structures for Nuclear Power Plants. The test results are reported in accordance with the requirements of 10CFR50, Appendix J, Section V.B.3, and ANSI/ANS 56.8-1987.

1Property "ANSI code" (as page type) with input value "ANSI/ANS 56.8-1987.</br></br>1" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process..2 TEST SYNOPSIS Containment pressurization commenced at 1918 on 2-13 91_and test pressure was obtained at 1130 on 2-14-91.

Air mass stabilization began-at 1130 on 2-14-91 and was achieved in nine and one half hours, ending at 2100 on 2-14-91. The test began at 2100 on 2-14-91 with a test duration of nine and three quarter hours, ending at 0645 on 2-15-91. Verification commenced at 0800 on 2 15-91 following a one hour stabilization and was completed at 1430 on 2-15-91. Containment depressurization started at 1430 on 2-15-91 and was completed at 0800 on 2-16-91.

The Primary Containment Integrated Leakage Rate Test (ILRT) was successfully completed at 1430, on 2-15-91 at the San Onofre Nuclear Generating Station, Unit 1.

All ILRT requirements of the Technical Specifications were satisfied.

SONGS 1 1991 ILRT TEST REPORT PAGE 4 TEST 'SEQUENCE START COMPLETION PRESSURIZATION 1918 2-13-91 1130 2-14-91 STABILIZATION 1130 2-14-91 2100 2-14-91 TEST 2100 2-14-91 0645 2-15-91 VERIFICATION (Stabilization) 0700 2-15-91 0800 2-15-91 (Test) 0800 2-15-91 1430 2-15-91 BLOWDOWN 1430 2-15-91 0800 2-16-91 TOTAL TIME ANALYSIS Analysis of the measured data taken during the test resulted in a measured leakage rate of 0.0342 %/day, a calculated leakage rate of 0.0275 %/day and a 95%

probability upper confidence limit (UCL) leakage of 0.0805 %/day using the Total Time calculation technique as recommended in ANSI 45.4-1972 and BN-TOP-l.

The leakage rate at this upper confidence limit plus a 0.0012 %/day (as left) and a 0.0056 %/day (as found)

Local Leak Rate penalty (See Section 6.0) yields an overall leakage rate of 0.0817 %/day (as left) and a 0.0861 %/day (as found) of contained air mass which satisfies the acceptance criteria of being less than 0.090 %/day.

MASS POINT ANALYSIS This section is provided for information only and was not-used-- to-.determine test acceptability as., Mass Point Analysis is not-used in BN-TOP-1 Short Duration Tests.'

Analysis of the measured data taken during the test resulted in a calculated leakage rate of 0.0337 %/day and a 95 % probability upper confidence limit (UCL) leakage of 0.0379 %/day using the Mass Point calculation technique as recommended in ANSI/ANS 56.8 1987.

The leakage rate at this upper confidence limit plus a 0.0012 %/day (as left) and a 0.0056 %/day (as found) Local Leak Rate penalty (See Section 6.0) yields an overall leakage rate of 0.0391 %/day (as left) and a 0.0435 %/day (as found) of contained air mass which would satisfy the acceptance criteria of being less than 0.090 %/day.

SONGS 1 1991 ILRT TEST REPORT PAGE 5 VERIFICATION TEST Following the completion of the ILRT measurements, a successful verification test was performed with an imposed leakage rate of 4.3 SCFM. The Total Time measured leakage rate of 0.1304 %/day and calculated leakage rate of 0.1293 %/day were within the allowable limits of 0.1103 %/day to 0.1703 %/day. The Mass Point calculated leakage rate, presented for information only, of 0.1232 %/day established during the verification test was within the allowable limits of 0.1166 %/day to 0.1766 %/day.

The leakage rates for this Primary Containment ILRT demonstrates that leakage through the primary reactor containment, systems and components penetrating primary containment do not exceed the allowable leakage rate specified in the SONGS 1 Technical Specifications.

1.3 DOCUMENTS AND TEST INFORMATION RETAINED AT SONGS The following documents and test information are available for review at the San Onofre Nuclear Generating Station:

1)

A listing of all containment penetrations, penetration size, and functions.

2)

A listing of normal operating instrumentation used for the leakage rate test.

3)

A system lineup (at the time of the test) showing required valve positions and status of piping.

4)-..A.continuous,..sequential log of events from initial survey of containment to restoration of all tested systems.

5)

Documentation of instrumentation calibrations and standards.

6)

The official test copy of the test procedure with sign-off of procedural steps.

7)

Computer printouts of Integrated Leakage Rate Test data reports, graphs and plots obtained during the test using the Southern California Edison developed computer program.

SONGS 1 1991 ILRT TEST REPORT PAGE 6

8)

P&IDs

9)

Local Leak Rate Test History Files 2.0 GENERAL DATA (PLANT INFORMATION) 2.1 Owner Southern California Edison 2.2 Docket No.

50-206 2.3 Plant San Onofre Nuclear Generating Station, Unit 1 2.4 Location San Onofre, California 2.5 Containment Type Steel Sphere 2.6 NSSS Supplier Westinghouse, PWR 3.0 TECHNICAL DATA 3.1 Containment Net 1,210,000 cubic feet Free Air Volume 3.2 Design Pressure 52.7 PSIG 3.3 Design Metal 280.0 degrees F Temperature 3.4 Calculated Peak 52.0 PSIG Accident Pressure (Pa) 3.5 Calculated Peak 292.0 degrees F

-4Vapor..Accident Temperature 4.0 TEST DATA

SUMMARY

4.1 Test Method Absolute Method 4.2 Data Analysis Techniques

1)

Total Time per ANSI N 45.4-1972 and BN-TOP-1, Rev. 1

2)

Mass Point per ANSI/ANS 56.8-1987 4.3 Test Pressure 52.3 PSIG + 0.2, -0.0 PSIG

SONGS 1 1991 ILRT TEST REPORT PAGE 7 4.4 Maximum Allowable 0.120%/day Leakage Rate (La) 4.5 ILRT Results Leakage Rate (wt. %/day)

Lam Lcalc 95% UCL 95% UCL 95% UCL

+ LLaf*

+ LLal*

Tot Time 0.0342 0.0275 0.0805 0.0861 0.0817 Mass Pt 0.0337 0.0379 0.0435 0.0391

• LLaf/al = Local Leak Rate Penalty (as found/as left) 5.0 VERIFICATION TEST DATA

SUMMARY

5.1 Verification Test

.1129%/day (4.3 SCFM)

Leakage Rate 5.2 Verification Test Leakage Rate (wt. %/day)

Results Limits Calculated

1)

Total Time 0.1103 to 0.1703 0.1293

2)

Mass Point 0.1166 to.0.1766 0.1232 6.0 LOCAL LEAK RATE TEST DATA

SUMMARY

6.1 PENETRATIONS NOT ALIGNED TO SIMULATE POST-ACCIDENT CONDITIONS During-the ILRT, the penetrations listed below were not aligned to simulate the configuration after a postulated accident..-The measured local leakage. rates.

obtained from Test procedure SO1-V-1.12, "Containment Penetration Leak-Rate Testing", are given below and are added to the ILRT results as the As Left penalty and as a portion of the As Found penalty.

VOL #

DESCRIPTION VALVE #

13 SPHERE EQUAL/VENT Sl-CVS-CV-010 Sl-CVS-CV-040 Sl-CVS-CV-116 17 SPHERE SUMP DISCH Sl-RLC-CV-102 Sl-RLC-CV-103 21 INSTRUMENT AIR Sl-ISA-001/

Sl-ISA-955

SONGS 1 1991 ILRT TEST REPORT PAGE 8 VOL #

DESCRIPTION VALVE #

31 HOT LEG ALT. RECIRC.

Sl-CRS-020/

S1-CRS-341 35 SPHERE TEST SYSTEM Sl-STS-303 36 SPHERE TEST SYSTEM S1-STS-320 LLRT PENALTY = 0.00115 %/day (use 0.0012 %/day as the As Left penalty) 6.2 AS FOUND / AS LEFT LLRT PENALTY In accordance with IE information Notice No. 85-71, "Containment Integrated Leak Rate Tests", an As Found /

As Left LLRT penalty was calculated and added to the ILRT results.

It should be noted that since the ILRT was not originally scheduled for this outage as found LLRTs were not always performed. In all but one case quarterly LLRTs from May, 1990 were used as the as found LLRT.

In the remaining case work was performed on only one side of the penetration; the as found, through penetration LLRT used only the results from the other, unworked, side of the.penetration. The following penetrations were applicable to this calculation:

VOL #

DESCRIPTION VALVE #

1 ESCAPE HATCH SEALS 2

PERSONNEL AIRLOCK SEALS 8

EAST ELEC PANEL 1 VARIOUS 10 WEST ELEC PANEL 3 VARIOUS 15 RMS 1212 RETURN Sl-CVS-CV-146 Sl-CVS-SV-1212-8 16 PRT GAS SAMPLE S1-RSS-CV-948/949 18 RCS DRN TNK DISCH S1-RLC-CV-104/105 20 SERVICE WATER SUP Sl-SDW-CV-115/537 24 M/U WATER TO PRT Sl-PMU-CV-533/534 27 PZR SAMPLE Sl-RLC-CV-951/953/992 28 RCS LOOP B/C SAMP S1-RSS-CV-955/956 S1-RSS-345/SV-3302 29 N2 TO PORVS Sl-GNI-102/732/1294 Sl-GNI-CV-532 38 SIS HDR VENT Sl-SIS-SV-702A/702B AS FOUND / LEFT PENALTY = 0.00445 %/DAY The total as found LLRT penalty is the sum of the values in sections 6.1 and 6.2, or:

TOTAL AS FOUND LLRT PENALTY = 0.0056 %/DAY

• e SONGS 1 1991 ILRT TEST REPORT PAGE 9 7.0 ANALYSIS AND INTERPRETATION 7.1 PRESSURIZATION Pressurization started at 1918 on 2-13-91. Test pressure of 67.1 PSIA was achieved at 1130 on 2-14-91.

Average pressurization rate was 3.6 PSI/HR using a 5,400 SCFM diesel compressor system.

7.2 CONTAINMENT ATMOSPHERE STABILIZATION The acceptance criteria for containment atmosphere temperature stabilization at test pressure is provided by ANSI/ANS 56.8-1987 and BN-TOP-1. These criteria ensure that the rate of change of the containment temperature is proportional to the rate of change of containment pressure and that the containment atmosphere has been at test pressure for at least four hours. An additional criteria for mass stabilization was also used. This required mass differentials to be trending towards a constant, negative value to ensure that temperature and pressure were moving together.

Stabilization commenced at 1130 and was achieved at 2100. All ANSI/ANS 56.8-1987, BN-TOP-1 and mass stabilization criteria were met.

The stabilization duration was 9.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

39 data points were used in the calculations.

Data was collected at 15 minute intervals.

The rate of change of average temperature was less than 1.0 F/hour averaged over the last two hours.

The rate of change of temperature changes was less than 0.5 F/hour/hour averaged over the last two hours.

Plots of average temperature and pressure versus time were maintained.

Individual sensor plots were maintained and reviewed prior to completion of stabilization.

7.3 ILRT (Total Time)

The acceptance criteria for the ILRT is that the leakage rate determined using the 95% UCL value for Total Time calculated leakage rate plus the sums of the measured leakage rates for penetrations not included in

SONGS 1 1991 ILRT TEST REPORT PAGE 10 the ILRT with the difference between as found/as left leakage rates for all penetrations, must be less than 75% of the allowable leakage rate (La) at the peak accident pressure (Pa).

The test duration was 9.75 hours8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br />.

40 data points were used in the calculations.

Data was collected at 15 minute intervals.

The double bound 95% probability value for the calculated leak rate using the Total Time technique was 0.0805%/day.

The as left penalty is 0.0012 %/day and the as found penalty is 0.0056 %/day (See Section 6.0).

75% of the allowable leakage rate of 0.120%/day, or 75% La, is 0.090%/day.

The 20 data point mean value = 0.0194 %/day.

The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> predicted calculated total time leak rate = 0.0885 %/day.

The acceptance criteria for the test using the Total Time technique is satisfied, i.e.,

95% UCL + Penalty (as left or as found) <.75 LA (as found) 0.0805%/day + 0.0056%./day < 0.090%/day 0.0861%/day < 0.090%/day (as left) 0.0805%/day + 0.0012%./day < 0.090%/day 0.0817%/day < 0.090%/day 7.4' ILRT (Mass Point)

The acceptance criteria for a short duration ILRT does not recognize the use of the Mass Point Method. Data is supplied for information only purposes.

The Mass Point Leakage Rate calculated with a 95%

probability UCL is 0.0379%/day.

The LLRT penalty for penetrations not included in the ILRT and for the as found/as left leakage is 0.0056 %/day (See Section 6.0).

75% of the allowable leakage rate, or 75% La, of 0.120%/day is 0.090%/day.

SONGS 1 1991 ILRT TEST REPORT PAGE 11 The acceptance criteria for the ILRT leakage rate using the Mass Point technique, if allowed, is satisfied, i.e.,

95% UCL + Penalty (as left or as found) <.75 La (as found) 0.0379%/day + 0.0056%/day < 0.090%/day 0.0435%/day < 0.090%/day (as left) 0.0379%/day + 0.0012%/day < 0.090%/day 0.0391%/day < 0.090%/day 7.5 IMPOSED LEAKAGE RATE VERIFICATION TEST 7.5.1 TOTAL TIME CALCULATIONS The acceptance criteria for the imposed leakage verification test is given by the following equation:

Lo + Lcalc -

.25 La < Lver < Lo + Lcalc +.25 La

where, Lo

=

imposed leakage rate which must be in the range

.75 La < Lo < 1.25 La Lcalc =

ILRT calculated leakage rate at the end of the test Lver

=

Verification test calculated leakage rate Addition criteria are:

Calculations shall utilize at least 10 data

points, The imposed leak'shall be allowed to stabilize for one hour.

Verification test duration shall be at least five hours which is approximately one half the test duration as required by BN-TOP-1.

Actual Test Data is as follows:

Lo

=

0.1129%/day (4.3 SCFM) 0.25 La

=

0.03%/day Lcalc

=

0.0275%/day Lver

=

0.1293%/day

SONGS 1 1991 ILRT TEST REPORT PAGE 12 Data Points

=

27 Duration

=

6.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> The acceptance criteria for the Total Time technique of determining the imposed leakage rate is satisfied, ie.,

Lo + Lcalc -

.25 La < Lver

< Lo + Lcalc +.25 La 0.1129 + 0.0275 -

0.030 < 0.1293 < 0.1129 + 0.0275 + 0.030 0.1104 < 0.1293 < 0.1704 NOTE:

0.1104 and 0.1704 reflect round off error associated with using four significant figures, the program used to perform the ILRT used eight significant figures and did not get this error resulting in 0.1103 and 0.1703 being used as limits in the ILRT.

7.5.2 MASS POINT CALCULATIONS The acceptance criteria for the imposed leakage verification test using the Mass Point technique is the same as Total Time technique defined in Section 7.5.

Actual Test Data is as follows:

Lo

=

0.1129%/day (4.3 SCFM) 0.25 La

=

0.03%/day Lcalc

=

.0.0337%/day Lver

=

0.1232%/day, Data Points

=

27 Duration

=

6.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> The acceptance criteria for the Mass Point technique of determining the imposed leakage rate is satisfied, i.e.,

Lo + Lcalc -.25 La

< Lver

< Lo

+ Lcalc +.25 La 0.1129 + 0.0337 -

0.030 < 0.1232 < 0.1129 + 0.0337 + 0.030 0.1166 < 0.1232 < 0.1766

SONGS 1 1991 ILRT TEST REPORT PAGE 13 8.0 LOCAL LEAK RATE TESTING

SUMMARY

Penetration (Type B and C) testing was accomplished in accordance with the requirements of the Technical Specification 4.3.1 and per SO1-V-1.3.

the penetrations were tested using the pressure decay method, make up method, and local test panels. The allowable leakage for all penetrations is 0.072%/day (0.6 La) of the mass of air in the containment at 52.0 PSIG.

The following is an Operational History of Unit 1 since the previous ILRT (conducted in March 1988) and the through penetration leakage expressed in %/day.

DATE DESCRIPTION LEAKAGE (%/DAY) 7-24-88 ENTERED MODE 4 0.009 11-29-88 ENTERED MODE 5 0.009 4-24-89 ENTERED MODE 4 0.010 5-5-89 ENTERED MODE 5 0.010 5-12-89 ENTERED MODE 4 0.006 5-28-89 ENTERED MODE 5 0.006 6-24-89 ENTERED MODE 4 0.010 7-5-89 ENTERED MODE 5 0.010 7-18-89 ENTERED MODE 4 0.010 11-2-89 ENTERED MODE 5 0.010 11-13-89 ENTERED MODE 4 0.008 11-17-89 ENTERED MODE 5 0.008 11-19-89 ENTERED MODE 4 0.008 7-2-90 ENTERED MODE 5 0.008