ML20141N881
| ML20141N881 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/30/1985 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20141N876 | List: |
| References | |
| NUDOCS 8603180237 | |
| Download: ML20141N881 (17) | |
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SOUTHERN CALIFORNIA EDISON COMPANY-SAN ONOFRE NUCLEAR GENERATING STATION UNIT 3 REACTOR CONTAINMENT BUILDING INTEGRATED LEAK RATE TEST FINAL REPORT NOVEMBER 1985 TEST 860:.1180'tJ7 860:sa 2 PDR ADOCK 05000362 P PDR
SONGS 3 1985 ILRT TEST REPORT PAGE'2-TABLE OF CONTENTS
1.9 INTRODUCTION
3 1.1 GENERAL 3 1.2 TEST SYNOPSIS 3 1.3 DOCUMENTS AND TEST INFORMATION 5 RETAINED AT SONGS 2.0 GENERAL DATA 6 3.8 TECHNICAL DATA 6 ,
4.0 TEST DATA
SUMMARY
7 5.8 VERIFICATION TEST DATA
SUMMARY
7 6.9 LOCAL LEAK RATE DATA
SUMMARY
8 7.9 ANALYSIS AND INTERPRETATION 8 7.1 PRESSURIZATION 8 7.2 CONTAINMENT ATMOSPHERE STABILIZATION 8 7.3 ILRT (Mass Point) 9 7.4 ILRT (Total Time) 18 7.5 IMPOSED LEAKAGE RATE VERIFICATION TEST 11 (Mass Point) 7.6 IMPOSED LEAKAGE RATE VERIFICATION TEST 12 (Total Time) 8.S LOCAL-LEAK RATE TESTING
SUMMARY
13 9.8 AS FOUND ILRT 14 2-9.1 BEFORE MAINTENANCE AND PRIOR TO PURGE 15 OR OPENING HATCHES 9.2 BEFORE MAINTENANCE AND AFTER USE OF 15 PURGE AND HATCHES
9.3 CONCLUSION
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SONGS'3'1985lILRT. TEST REPbRTl 'PAGE'3
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j ~ 1.01 INTRODUCTION 1;l faEMEE&L 4
.The . reactor conta inment' building ' Integrated ~ Leakage
. Rate - ' Test . (Type- A): ;wa C 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 '3 Technical Specification, Section 3.6.1.2 The test l was performed as part of the Unit 3 first refueling '
' outage.
-The successful Type A ' and supplemental- verification.
tests' :were' performed in ~ accordance with the requirements of ' San Onofre Nuclear Generating. ,
Station, Unit-2 & 3, Procedure'SO3-V-3.12, Revision !
0,- Containment 1 Integrated Leak Rate Test. The
, test method utilized ' wa s ' 'the . absolute : method t' described in ANSI /ANS-56.8-1981, Containment: System
. Leakage Testing- Requirements. The leakage rate was calculated using' thel Mass Point and Total Time
-formulae from this standard and Bechtel Topical Report, BN-TOP-1, Revision 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 10CFR58, Appendix J, Section V.B.3, and ANSI /ANS 56.8-1981 1.
1.2 TEST SYMOPSIS Pressurization was started at 9138 on 11/23/85 and test pressure was obtained 11/23/8'5. At this time, the
, Chilled Water, Chillers, and Dome . Air circulators were secured. Temperature stabilization was achieved in four hours, with the test commencing at 2288 ' on 211/23/85. Based' on ana)ysis of the test
, data, fit was determined at 0339.on 1.1/24/84 that one of the Dome Air' Circulators was' still' operating. ~I control Room Supervision confirmed that a circulator
- was still in operation. The cause was a ' failed indicating light on the control board. The circulator was secured, resulting in a step change in the data.t The test was restarted at 8545 on 11/24/85, ' following data stabilization and concluded at 0600, 11/25/85. The Verification test was started at 9615, 11/25/85. One hour was allowed for stabilization followed by a four hour test.
Depressurization was started at l',15 , 11/25/85 and completed at 8215, 11/26/85.
t i
The Primary Containment Integrated Leakage Rate Test
, (ILRT) was successfully completed on November 25, 1985
- at the San.Onofre Nuclear Generating Station, Unit
- 3. All ILRT requirements of the Technical Specifications were satisfied.
TEST SEQUENCE START COMPLETION PRESSURIZATION 0130 - 11/23/85 1739 - 11/23/85 STABILIZATION 3745 - 11/23/85 2288 - 11/23/85 TEST 9545 - 11/24/85' 9608 - 11/25/85 VERIFICATION 9615 - 11/25/85 1115 - 11/25/85 BLOWDOWN 1215 - 11/25/85 8215 - 11/26/85 MASS POINT ANALYSIS Analysis of the measured data taken during the- test resulted in a calculated leakage rate of 9.9511/ day and 'a 95% probability upper confidence limit (UCL) leakage 'of 0.852t/ day using the Mass Point calculation technique as recommended in ANSI /ANS 56.8-1981 The leakage rate ah this upper confidence limit plus a 8.992%/ day Local Leak Rate penalty (See Section 6.9) yields an overall leakage rate of 6.954%/ day of contained air mass which satisfies the acceptance criteria of being less than 9.875%/ day.
TOTAL TIME ANALYSIS Analysis of the measured data taken during the test resulted in a, calculated leakage rate of 0.848%/ day and a 95% probability upper confidence limit (UCL) leakage of 0.052%/ day using the Total Time calculation technique as recommended in ANSI 45.4-1972 The leakage rate at this upper confidence limit plus a 8.8024/ day Local Leak Rate penalty yields an overall leakage rate of 8.954%/ day of contained air mass which satisfies the acceptance criteria of being less than 0.075%/ day.
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, w : M Si3L1985"ILRT-TEST REPORT- " PAGE 5 1.2; TEST SYNOPSIS,(Continued)
VERIFICATION TEST
' Following the . completion of 'the .ILRT measurements, ,a f
, 4, - : successful. verification test was performed with an imposed e- - g. : .
_,' leakage- rate of-7.87 sefs. The " Mass Point icalculated-P leakage - rate of :8.1274/ day established: 'during the e verification test was -within the-allowable limits Hof 3.1264/ day: to 8.1764/ day.. The.. Total: Time calculated
- leakage rate of 0.1244/ day was'within the allowable. limits of 0.1234/ day to 5.1734/ day.
3 The calculated leakage rates for-this Primary Containment ILRTJ demonstrates that leakage through.the primary reactor
' containment and systems and components penetrating primary.
containment do not exceed- the allowable leakage rate
. specified;in the SONGS 3 Technical Specifications.
- 1.3 DOCUMENTS AND TEST INFORMATION RETAINED AT SONGS
, -i F The following documents. and test information are available-f' ,.
for review at the San Onofre Nuclear. Generating Stations
- 1) A listing of 'all containment penetrations, penetration size, and functions.
I
- 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 otficial test copy of the test procedure with sign-off of procedural steps.
- 7) computer printouts of int'egrated Leakage Rate Test Data and Reports along with Graphs and Plots of the data obtained during the test using Southern California Edison and Bechtel Power Corporation developed computer programs.
- 8) P&ID'S
- . 9) Local Leak Rate Test History Files
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SONGS 3L-1985 ILRT TEST REPORT' :PAGE 6_
2.0 GENERAL DATA (PLANT INFORMATION)-
2.1 ' Owner Southern ~ California' Edison 2.2 : Docket No. 50-361-
-2.3 Plant San Onofre Nuclear Generating Station -- UNIT 3 2.4 Location San Onofre, California 2.5 Containment Type Post-tensioned concrete,
[ 3.9 TECHNICAL DATA l
3.1 Containment Net 2,395,000 cubic feet Free Air Volume 3.2 Design Pressure 68.8 psig 3.3 Design Temperature 388.9 degrees F 3.4 Calculated Peak 55.7 psig i Accident Pressure
! (Pa)
I 3.5 Calculated Peak 287 degrees F Accident Temperature l
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SONGS 3'1985 ILRT TEST REPORT -
PAGE 7 4.8 TEST DATA
SUMMARY
4.1 Test Method Absolute Method 4.2 Data Analysis Techniques 1)' Mass Point per ANSI /ANS 56.8-1981
- 2) Total Time <24 hrs per BN-TOP-1
>24 hrs per ANSI /ANS 56.8-1981 4.3 Test Pressure 57.7 psig 4.4 Maximum Allowable 9.199%/ day Leakage Rate (La) 4.5 ILRT Results Leakage Rate (wt. 4/ day)
Lam 95% UCL 95% UCL + LL*
i
- 1) Mass Point 8.951 B.052 9.854 (See Section 7.3)
- 2) Total Time 0.048 9.952 0.054 (See Section 7.4)
I-5.0 VERIFICATION TEST DATA SUlMARY 5.1 Verification Test .1%/ day (7.87 scfm)
> leakage Rate 5.2 Verification Test Leakage Rate (wt. %/ day)
Results Limit Rate
! 1) Mass Point B.126-0.176 0.127 l
- 2) Total Time 8.123-8.173 S.124 l
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L SONGS 3: 1985 ILRT. TEST- REPORT ,
PAGE 8 s
l' 6.0 LOCAL LEAK RATE TEST. DATA -
SUMMARY
During: the ILRT, the penetrations listed below were -not '
aligned to simulate.the configuration after- a postulated ,
-The measured local leakage rates obtained from accident.
L Test, Procedure SO23-V-3.13,*. Containment Penetration- Leak l- Rate Testing", are given below 'and a::e added to the : ILRT-
[
-results.
l PEN- .
LEAKAGE RATE l 9. DESCRIPTION VALVE'9 t/ day H ISB ILRT PRESS SENSOR S21595MUf38~& ,
h S215SSMU939 0.000001 l 23C ILRT, FLOW FLANGE 9.088091
!' 34 ILRT PRESS CONNECTION FLANGE 5.008072' L 42 NON-CRIT CCW INLET 2HV6211 & 2HV6223 0.001190 i
43 NON-CRIT CCW OUTLET 2HV6216 s'2HV6236 0.889379 45 CTMT NORMAL INLET 2HV9998 & 2HV9920 8.088120 46 CTMT NORMAL OUTLET 2HV9971 &'2HV9921 S.008144 TOTAL LLRT Penalty 0.091898 7.5 ANALYSIS'AND INTERPRETATION 7.1- PRESSURIEATION
! Pressurization started at 9138'on No'vember 23, 1985.
l- The test- pressure of 57.7 'psig was achieved at 1730 l on November 23, 1985. The average pressurization rate l was 3.57 psi /hr over the 16.0 hour0 days <br />0 hours <br />0 weeks <br />0 months <br /> period, using a l- 9000 cfm diesel compressor system.
l i 7.2 CONTAINMENT ATMOSPHERE STABILIEATION l:
The acceptance criteria for containment atmosphere stabilization at test. pressure is that' the rate of r change of the containment temperature (weighted j average of RTD sensors) averaged over the last hour l shall not : deviate by more than 0.5 degrees F per
! hour from the' rate of change averaged over the last
! four hours, and that the containment almosphere has L. been at test pressure for at least four hours.
Temperature commenced 1745 and stabilization at was achieved at 220s.
Four Hour Average = 8.198 degrees F/hr Last Hour Average = 0.858 degrees F/hr Deviation = 0.858 degrees F/hr
V SONGS 3L1985 ILRT TEST REPORT. PAGE 9-7.9 ANALYSIS AND INTERPRETATION (Continued) 7.3 ILRT fMama Point)
The acceptance- criteria for a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ILRT is that the leakage rate determined .using the 954 - UCL value for the calculated leakage ' rate - plus - the local- leak rate ' penalty must. be less than 754-of the allowable leakage. rate (La) at the peak accident pressure-(Pa).
- The Mass Point Leakage Rate calculated with a 95%
. probability UCL is 0.9524/ day. ,
8 954 UCL = 5.9524/ day
penetrations not included.
(See Section 6.8). .
LL = 0.0024/ day
- 75% of the allowable leakage rate of 0.194/ day is 0.0754/ day.
75% La = 5.8754/ day The acceptance criteria for the ILRT leakage rate using the Mass Point technique is satisfied, i.e.,
95% UCL + LL < .75 La 8.952%/ day + 0.0924/ day < f.9754/ day 8.854t/ day < 0.0754/ day
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- SONGSi3 1985'ILRT TEST' REPORT , PAGE IS 7.0
~
ANALYSIS AND INTERPRETATION (Continued) 7.4_rtne troemi T1..)
The acceptance criteria for -the ILRT is ' that the leakage rate determined using the,95t'UCL value for Total Time calculated leakage- rate plus -the sum of the measured LLRT rates for penetrations not< included in the ILRT, must 'be less than 75% of-the' allowable leakage rate (La) at the peak accident pressure (Pa) .
The test duration was 24.25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />.
- 98 data points were used in the calculations.
- Data was collected at fifteen '(15) minute intervals. i The . upper bound 954 probability value for the' calculated leak rate using the Total Time technique was 3.0524/ day. '
- The LLRT-for penetrations not included in. t the ILRT is 5.0024/ day LL = 0.0824/ day.
- 75% of the allowable leakage rate of 0.18t/ day is 0.9754/ day.
La = 0.0754/ day.
t The acceptance criteria .for the test using 'the Total Time technique is satisfied,.i.e.,
95% UCL + LL < .75 LA 8.8524/ day + 5.0024/ day < 8.8754/ day 8.8544/ day < 0.0754/ day >
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SONGS 3 1985 ILRT, TEST REPORT PAGE 11 I'
7.8 ' ANALYSIS AND INTERPRETATION (Continued) 7.5 Imposed Isakaae mate verification Test tu==a Point)
The ace:eptance criteria for the imposed leakage verification test is given by the following -
equatio'ar
- Lo + Lcalc .25 La < Lver < Lo + Lealc + .25 La where, Lo = imposed leakage rate'which must be-in the range :
.75 La i Lo 1 1.25 La Lcalc = ILRT calculated leakage rate Lyer = Verification test calculated leakage rate Furthermore, the calculations shall utilize at least 18 data-points, recorded over a time span of at least 4 i hours.
/
Actual Test Data is as follows:
1-
- Lo = 0.198t/ day. (7.87 scfm)
- 8.25 La = 8.825t/ day l
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- Lealc = 8.8514/ day
- Lver = 0.1274/ day (Mass Point) ,
- Data Points = 17 The acceptance criteria for the Mass Point technique of determining the imposed leakage rate is satisfied, i.e.,
Lo + Lealc .25 La < Lver < Lo + Lealc + .25 La 8.188 + 8.851 - 8.825 < B.127 < 0.188 + 8.851 + 5.825 I 8.126 < 8.127 < 8.176 L
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7.0 ! ANALYSIS AND' INTERPRETATION (Continued)- y I 7.6 :r= named t=mkman mate verification Test (Total Ti==) ,
The. acceptance -criteria for' the inhosed :
leakage verification = test using' the Total Time' !
c
~ technique is, the same as. Mass Point -defined in -
Section 7.5. + >
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Actual Test Data is as follows: d L
- Lo = 0.1994/ day (7.87 sefs) i
- 8.25 La = 0.9254/ day
- Lcalc = 0.0484/ day ,
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- Lver = 0.1244/ day (Total Time) ,
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'* Data Points = 17 < ,
The acceptance criteria for'the Total Time ' technique j
, of determining the imposed leakage rate is satisfied, > '
L 1.e.,
Lo + Lcalc .25 La < Lver .< Lo.+'Lcalc + .25 La .
0.100 + 0.048 - 5.825 < f.124 < 0.100 + 8.048 + 5.025 .i L
8.123 < 0.124 < 0.173 t
8.8 LOCAL LEAK RATE TESTING SURNARY , i Penetration (Type B and C) testing was accomplished in 4 accordance witi the requirements of the. Technical Specification 3/4.6.1 and Mr' 8023-V-3.13. The penetrations were tested using the pressure decay method, i and local test panels. The allowable leakage for all .;
penetrations is 0.964/ day-(0.6 La) of the mass of air in i j the containment at 55.7 psig. ;
j At no time during Modes 1, 2, 3 or 4 did the allowable- t n leakage for all penetrations exceed 8.864/ day using IE :
l Information Notice No. '85-71 methods for determining the >
l through penetration leakage.
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SONGS'3~1985 ILRT TEST REPORT PAGE 13-
, 8.0 LOCAL LEAK RATE TESTING
SUMMARY
The following is an Operational History of Unit 3 since'the first ILRT (Preoperational Test) and the through penetration j leakage expressed in t/ day.
Date Description _ t/ day. l 3/30/82 Preoperational ILRT 5.002 1/ 6/83 Entar Mode 4 0.005 8/29/83 Initial Criticality 0.006 l j 9/16/83 Full Power License 0.006 i 11/17/83 100% Power 0.006' 1/ 8/84 Mode 5 - Initial Commercial Power Outage 0.006 [
3/ 2/84 Enter Mode 4 0.013 !
4/ 1/84 Commercial Power 0.013 l 6/13/84 Mode 5 - RCP Seal Replacement Outage 0.013 7/ 2/84 Enter Mode 4 '0.013 7/20/84 Mode 5 - E089 Leakage Outage 0.013 8/05/84 Enter Mode 4 0.013 10/30/84 Mode 5 - re89 Leakage Outage 0.013 11/27/84 Enter. Mode 4 0.012 1/29/85 Mode 5 - PVS1008 Leakage Outage 0.012 l 2/16/85 Enter Mode 4 0.012 3/12/85 Mode 5.- Press Boundary Leak-Inspection 0.012 1
3/16/85 Enter Mode 4 0.012 9/17/85 Mode 5 - First Refueling Outage 0.011 I I
11/23/85 First Refueling Outage ILRT 5.006 t
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SONGS 3 1985 ILRT TEST REPORT PAGE 14 4
8.0 LOCAL LRAK RATE TESTING SUISIARY (Continued)
In December 1982 and January 1983, all the LLRT's were performed prior to initial startup of the Unit. In January and Pobruary 1984, .all the LLRT's were performed prior to startup for initial commercial Operation. In September, October & November 1985, all LLRT's were ' performed prior to the First Refueling Outage ILRT.
9.0 AS POUND ILRT IE Information Notice No. 85-71 outlines the methodology for determining an As-Pound ILRT using LLRT results. Since the Notice was received late in the outage planning, LLRT's could not be performed just prior to use of Purge or defeating of the interlocks and opening of the Personnel Batch and the Escape Match. As a result, a higher contain-ment total was recorded for the initial LLRT than would be represented by the as found condition. LLRT's were performed on the Purge Valves (7/25/85), the Escape (8/29/85) and Personnel (8/30/85) Batch as part of the Surveillance Program. All outstanding Naintenance Orders were reviewed to determine if any of the planned work would affect the seating of the containment isolation valves or affect the pressure boundary of a penetration. Por those items that affect the LLRT's, a LLRT was performed prior to and after Maintenance to provide as-found status of the LLRT's. An LLRT was performed on the transfer tube flange prior to its removal.
Approximately one month af ter purge initiation, LLRT's on the purge penetrations were performed. These initial LLRT's revealed unacceptably large leakage rates, which are typical for the purge valves after use. The cause for the large initial leakage rates is believed to be seat contamination caused by placing containment purge inservice.
The following summarises the purge and hatch LLRT's.
LLRT Description (acca) NOTES i' Pen 4 18 - CNTMT PURGE SUPPLY Quarterly ( 7/25/85) 2641 1
, Initial (10/18/85) 20458 2 i PreILRT (11/21/85) 256 Pen 4 19 CNTMT PURGE EXHAUST
- i. Quarterly ( 7/25/85) 2196 1
- Initial (10/18/85) 25250 2
! PreILRT (11/22/85) 1028
4 80NG8 3 1985 ILRT TEST REPORT PAG 3 15 9.0 AS-POUND ILRT (Continued)
LLRT Description (acca) NOTES Pen 6 203 - Escape Hatch ,
Semi-Annual (8/29/85) 174 3 Initial (11/20/85) 348 5 i
Pen 6 406 - Personnel Hatch Semi-Annual (8/30/85) 744 4 Initial & PreILRT (11/20/95) 4083 5 NOTES 1: 51 days prior to start of the outage and purge operation.
2: 34 days after start of the outage and purge operation.
3: 20 days prior to start of the outage.
4: 19 days prior to start of the outage.
53 62 days after start of the outage.
The As-Found ILRT was determined by adjusting the -ILRT results in the following manner: ,
The differences between the before-maintenance and after-maintenance LLRT's were added to the Type A Leakage.
9.1 BEFORE MAIhTENANCE & PRIOR TO PURGE OR OPENING MATCHES
! Before After Local Leak Rate Test Maintenance Mainterance Difference !
l ...___________ .._________ ... ________ .___ -...... ..._______
LL (scca) 19709 13736 5973 LL (t/ day) 0.009 0.006 0.003 [
Total Time As-Found ILRT Las + Difference = .048 + 0.003 = 0.0514/ day 95% UCL + Difference = .052 + 0.003 = 0.055t/ day Mass Point As-Found ILRT Las + Difference = .051 + 0.003 = 0.054t/ day '
95% UCL + Difference = .052 + 0.003 = 0.055t/ day L 9.2 BEFORE MAINTENANCE & AFTER USE OF PURGE & HATCHES l Before After
! Local Leak Rate Test Maintenance Maintenance Difference l
i LL (scca) 64092 13736 50356 LL (t/ day) 0.029 0.006 0.023 I
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i SONGS 3 1985'ILRT TEST REPORT PAGE 16 1
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9.2 BEFORE NAINTENANCE & AFTER USE OF PURGE & HATCHES (Continued)
TotalTimbAs-FoundILRT Lam. + Difference = .048 + .523 = 0.0714/ day 954 UCL + Difference = .352 + .823 = 0.8754/ day Nass Point'As-Found ILRT Lam , + Difference = 851 + .523 = 0.974t/ day 95% UCL + Difference = .052 + .823 = 0.0754/ day The details of the . LLRT's shown above is recapped in the following table (See Page 17).
9.3 CONCLUSION
i No matter which philosophy is used for determining the As-Found LLRT, both analytical methods meet the Technical Specification requirement for the Type A leakage of less than or equal to 0.75 La (or 0.0754/ day).
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