IR 05000213/1986009

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Safety Insp Rept 50-213/86-09 on 860331-0416.No Violation or Deviation Noted.Major Areas Inspected:Test Witnessing & Preliminary Results Evaluation of Containment Integrated Leak Rate Test
ML20198C983
Person / Time
Site: Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date: 05/15/1986
From: Anderson C, Chung J, Joe Golla
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
Shared Package
ML20198C971 List:
References
50-213-86-09, 50-213-86-9, NUDOCS 8605230104
Download: ML20198C983 (17)
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U.S. NUCLEAR REGULATORY COMMISSION

REGION I

Report No. 86-09 Docket N License N OPR-61 Priority -- Category C Licensee: Connecticut Yankee Atomic Power Company P. O. Box 270 Hartford, Connecticut 06101 Facility Name: Haddam Neck Atomic Power Plant Inspection At: Haddam, Connecticut Inspection Conducted: March 31-April 16, 1986 Inspectors: 60, J. W. Chung, L Reacto Engineer h/3date 

 .k A."Go'lla, T actor Engineer 6-/d - B&,

date Approved by: J' s' date C.An@Srson, EB, DR Chief, Plant Systems Section Inspection Summary: Inspection on March 31-April 16, 1986 (Inspection Report No. 50-213/86-09).

Areas Inspected: Routine unannounced inspection of test witnessing and pre-limiary results evaluation of containment integrated leak rate test (CILRT), and tours of the facilit Results: No violations or deviations were identifie [ PDR ADOCK O , 

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DETAILS 1 ~. 0 Persons Contacted Connecticut Yankee Atomic Power Company M. W. Baehr, Outage Planning T. Donzello, I&C 

*J. Delawrence, ISI Engineering Supervisor
*J. Ferguson, C.Y. Manager
*R. Graves, C.Y. Manager M. Turner, ISI Engineer NUSCO
*J. Dimarzo, NUSCO Special Test Group
*R. Schmidt, NUSCO Special Test Group Stone & Webster Engineering Corporation R. Parry, Supervisor, Mechanical Test Engineering U.S. Nuclear Regulatory Commission
*S. Pinda'se, Resident Inspector
*P.-Swetland, Sr. Resident Inspector
* Denotes those present at exit meeting held on April 3, 198 .0 Administrative Controls of CILRT A pretest meeting was held on April 1,1986 to discuss the progress of test preparations and the scope of the test. The inspectors observed the-following:

I * A representative from QA was in attendance 

* Scheduling.and nature of the final containment walkdown were discusse *

Several valve repairs were-still in progress including letdown and seal water supply check valves 

* CILRT valve lineups we.e 75% complete
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* The use of fan coolers inside containment during the test was dis-cussed. There are 4 containment air recirculation (CAR) fans inside containment. Three of these had cooling water from the service water system as their heat sin It was determined that the cooling units would be secured for the duration of the test. This will provide for a more stable containment atmospher The licensee's decision to secure the service water during the test was to provide temperature stabilit * A total of 20 RTDs were installed: 10 permanent and 10 temporary RTD * RTD's 1 through 9 were reading 0. A wiring problem was suspected
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between the instruments and the computer. Connecticut Yankee I&C personnel were trouble shooting the proble * Leak test on containment dome flange seal was to be done before the CILRT. This leak test failed earlier during the outage. A new gasket was installed for the next tes * Maintenance activities were still in progress for the test: removing wood, rags and other flammables; removing any pressurized canisters such as nitrogen bottles, fire extinguishers, et . The following documents were reviewed: 

* Control Room Log Book
* Calibration Records: 2 data acquisition units, 7 dew cells, 18 RTD's, 2 mass flow meters, 4 pressure gage *

Haddam Neck technical specifications applicable to CILRT 

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- Selected containment penetration valve lineup diagrams
* Liquid collection method leak rate calculations for selected penetrations
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CILRT sensor volume fraction calculation 

* Sensor-location diagrams
* Instrumentation selection guide calculation
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Procedure SUR 5.7-108, Containment Integrated Leak Rate Test, Revision 2, March 26, 198 _- 

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The inspectors noted that the the CILRT director was generally late in gaining information concerning direct CILRT activities such as the progression of containment cletii fness work, test instrumentation oper-ability, and valve lineup No ott.sr deficiencies were observe .0 Final Containment Walkdown On April 2, 1986 the final closeout inspection was conducted as required by 10 CFR 50, Appendix J, and the following items were observed: QA/QC personnel participated in the inspection 

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The necessary tanks and systems were vented per procedures, including the pressurizer relief tan * Containment housekeeping was good: wood scaffolding, flammables, pressure vessels such as fire extinguishers had been remove * A sample of ILRT Instrumentation, dew cells and RTDs, was verified in plac * A sample of containment penetrations were inspected and verified to be vented such that the containment isolation valves are exposed to test differential pressur * The data acquisition center was inspecte The acquisition equipment was calibrated and operationa * The containment pressurization system was inspected. This consisted of four compressors connected to a manifold. The manifold is connec-ted to the containment through a 6" containment purge line. The compressors will be isolated and the manifold vented during the CILR No unacceptable con' d itions were identifie .0 Containment Integrated Leak Rate Test (CILRT) 4.1 Exemption Request By a letter dated March 12, 1986, the licensee submitted to NRR a request for exemption from several Appendix J leak test requirements.

- The proposed change request was divided into two parts: the first part consisted of permanent exemptions related to types "A" and "C" tests, and the second part was schedular exemptions related to type 

 "C" leak testing only. However, the second part of the proposed schedular exemptions could impact the type "A" test should the pro-
posed penetration or penetrations be isolated during the type "A" test.

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The items under review by NRR under the proposed exemption request were not reviewed during this inspection, pending final NRR resolu-tion. They included the following: Permanent Exemptions 

. Item 2.2.1: allow continued type "A" testing at 15 psi . Item 2.2.2: exempt from type "C" testing for penetrations 154, 16, 17, 18, and 8 . Item 2.2.3: reverse direction testing for P-80 with water Schedular Exemptions
. Reactor Coolant Charging penetration P-8
. Containment sump to RHR pump suction line penetration P-73
. Allow reverse direction tests on P-33 (PU-V-242) and P-78 (DH-TV-554) of Pressurizer Relief Tank Drain
. Allow water tests on the penetrations: P-3, 7, 10, 11, 24, 28, 30, 34, 38, 60, 61, 63, 66, 67, 68, 69, 74, 75, 76, and 7 .2 Procedure Review The CILRT test procedure, SUR 5.7-108, Revision 2, was reviewed for test adequacy and system isolation. Procedural step 9.1 identified six penetrations which were isolated during the type "A" ILR Their Local Leak Rate Test (LLRT) results would be added to the results of the ILRT. They were penetrations P-28, 29, 63, 70, 80, and 8 The inspector identified two additional penetrations which were programmatically isolated in the test procedur They were penetra-tions P-12B and P-13, and the licensee acknowledged that those two penetrations would be added in procedural step 9.1 and their LLRT results would be added to the ILRT result .3 Test Instrumentation The inspectors reviewed the calibration records for the sensors used for the CILRT. It was ascertained that the instruments were cali-brated within the 6 month period prior to the test and that the standards used were traceable to the National Bureau of Standard This is required per industry standard ANSI /ANS 56.8-1981. The inspectors also verified that the instrument system satisfied the instrument selection guide of ANSI /ANS 56.8-1981. The inspectors observed the operation of the automatic data collection system and
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witnessed the arrangement of the RTD's and dew cells in the contain-ment. All instruments observed were placed in areas which would permit a good average of the containment bulk drybulb and dewpoint temperatur No unacceptable conditions were identifie .4 FAILURE OF "AS FOUND" CILRT At 2300 hours, Wednesday, April 2, 1986, the containment pressuri-zation was commenced after replacing the leaky gasket for the flanges connecting the air compressors to the containment pressurization penetration. At 0625, April 3, 1986, the compressors were secured and the containment stabilization period was starte In accordance with procedural requirements, containment temperatures and pressure were monitored every 15 minutes. The hardwired computer calculated the containment air mass, Least-Square-Fitted (LSF) leak rate and the upper confidence level continuousl In order to verify the validity of the computer software for the ILRT calculations, the inspector made an independent calculation as follows: Data Point at 1215 hours, April 3, 1986 Average RTD Readings = 72.3735 F Vapor Pressure (Dewcells) = 0.1887 psi Containment Air Pressure = 30.6087 psia Containment Volume = 2,232,000 cubic feet The inspector calculation of containment air mass with a hand-held calculator was 344,443.51 lb. and was 0.6% smaller than the computer , calculation. The inspector determined that the above difference was due to the truncation errors from the hand-held calculato Based on the data points of the first 6 hours (0700 hour to 1300 hour, April 3,1986) a straight line correlation of the containment mass points indicated a leak rate of 0.475%/ day, exceeding the maxi-mum allowable leak rate of 0.11071s/ day. Subsequently, the licensee acknowledged that the "AS FOUND" CILRT failed. The following is a summary of the stabilization failures as given in the official CILRT log book: i ! __ -. . _ _ - . - . _ _ _ 

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Official Test Starting Time Comment 0650 hours 4-3-86: faileb three penetrations isolated 1902 hours 4-3-86: failed service water leak l l 2200 hours- 4-3-86: failed SW-V-266 Blank Flanged 0200 hours, 4-4-86: failed CAR fan 1613-2021 hour, 4-4-86 Successful completing of stalibi-lization , In accordance with the requirement specified in III.A.6(b) of 10 CFR 50, Appendix J, the above failure of the type "A" test requires the licensee to perform a CILRT type "A" test during the next refueling outag .5 Quantification of Lccal Leaks The licensee identified several leaks;from the following penetra-tions, and quantified the leaks by an approximate displacement metho P-3 = 10,400 ml/ mi P-7 = 15 ml/ mi P-23B= 300 ml/ mi P-24 = 53 ml/ mi P-61 = 4 drops /5 mi P-65 = 1,000 ml/ mi P-69 = 10 ml/ mi P-81 = 6.6?0 ml/ mi Considering the magnitude of the leakages, the licensee decided to isolate th ee penetrations, P-3, P-65, and P-81, whose LLRT results would'be added to the final "AS LEFT" CILRT results as per III. A. requirements in Appendix J, 10 CFR 50 along with those of the eight penetrations discussed in section At 2200 hours, ! April 3,1986, service water system (SW-V-266) was isolated due to large leaks. A blind flange was installe . I i 

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4.6 Chronology of CILRT Sequence April 2, 1986 1030 All RTO's verified functional 1330 Interlock wiring successfully completed 1440 Verification test for the containment pressure devices were performed for both computers. The first computer (9836C) seems to record the right pressures. The second ~-~ computer (TI#2) was not showing the right pressure variation. Working to resolve the proble The containment pressure variations recorded by TI#2 were-checked and are functiona Shutdown of compressors. Leaking flange in containment pressurization piping somewhere near the compressor Leak found at spectacle flange 2139 Tightened the flange 2144 Starting compressors, 14.759 psia reference pressure 2148 Stopped compressors; flange still leaking. Will change gaske Started pump-up 2305 All 5 compressors on line, pumping up at 2.75 psi /h Pressure at 2.00 psig April 3, 1986 0019 Pumping up at 2.4 psi /h Pressure at 4 psig 0148 Pressure at 7.00 psig 0329 Pressure at 11.00 psig 0622 Pressure at IE00 psig 0625 Isolated compressors 

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0 Rotated spectacle flange c,losed. This is official 77 650 start time for temperature stabilization test (failed j subsequently).

0846 P-62 service air valve leaking 500 ml/ min. OPS to ' retorque valve close , {~ 

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1100 Some leakage problems were detected and inspections starte , 1630 Threepenetrations#P-3(HPSI),P-81-(AFWS),P-55 l l (Air Monitor System) were isolated'. These had the . 

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l highest leak rates. Temperature stabilization' period i has been reinitialized to this time (apparently' failed again).

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1902 Containment air recirculation (CAR) fan #2 blank flange . Suspect service water lea + 

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2001 Estimated a leak of 1280 ml/25 sec by water displacement at #2 CAR fa Temperature stabilization again reinitialized to this time. Require an additional 4 hours (apparently failed again).

2208 OPS located leak at service water valve SW-V-266, and a blank flange was installe April 4,1986 0210 End of stabilization period / official beginning of 24 hour 

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CILRT period. Containment temperature at 78.28 F(apparen-tly failed again).

0800 Containment temperature at 80.56 High rate of containment temperature increase was note Con.tainment temperature at 81.53 F and increasing 

,  steadil Containment temperature at 82.24 _ Service water flow established to CAR fan #1 by opening valve No. SWD264 to " open. Tnis was cone in an attempt to dampen out the continuing rise of ccr.tainment air temperatur >*

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1500 Containment temperature at 62.44 Valve SWD264 closed back to " open. This was done to reduce the rate of temperature change. Containment temperature at 82.29 F (apparent new stabilization period started).

1806 Containment temperature at 82.59 F.

_ 1906 Containment temperature at 82.76 Official 24 hour CILRT test period reinitialized to this tim Containment temperature at 83.12 April 5, 1986 0321 Containment temperature at 84.09 Containment temperature at 84.94 Containment temperature at 85.68 Containment temperature at 86.08 Official 24 hour CILRT complete: 0.75 L tm required =0.08265%/ day >0.%/ day =Lg , measure Begin verification test stabilization perio Awaiting gas release permit from chemistr Signed off on gas release permi OPS having a problem opening valve #VS-TV-1848 for gas release.

l ' 0021 Valve #VS-TV-1848 is repaire Verification test began (failed subsequently).

0031 Unit #1 data collection system is not working. I&C is checking instruments (flow devices) in primary auxiliary building (PAB).

0050 Mechanical flow path checked out oka Now checking flow instrument wire . 

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0449 Wiring problem identified and correcte Verification test restarted at this time (failed again).

0548 Verification test terminated because of a bad BCD boar Restart of verification test temperature stabilization perio ._ 1009 Official start of verification test at this tim Verification test temperature stabilization approve Verification test complete Data analysis completed by ST .0 "AS LEFT" CILRT RESULTS 5.1 Stabilization As shown in section 4.4, the official stabilization period was declared-four times before the containment temperature was finally stabilized. The final stabilization period commenced at 1613 hours, April 4, 1986 and ended at 2021 hours, approximately 4 hours after the initiatio The containment temperature is plotted in figure 1, and the rate of temperature variation evaluated by the inspector as follows: 

 ' Average rate of temperature change for 4 hours:
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0.16 F/hr 

 * Average rate of temperature change for last I hour: 0.11 F/hr The difference = 0.05 F/ hour which is less than the Acceptance criterion of 0.5 F/h .2 "AS LEFT" CILRT The 24 hour test was commenced at 2021 hours, April 4, 1986 and completed by 2025 hours, April 5, 198 During the test, the following control room indications were monitored in order to observe any changes in plant system and water levels.

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Control Room Indications Cold CAR Fan Containment Steam Generator Pressurizer DATE/ TIME Amperage (AMP) Sump Level Level % Level 1 2 3 4 inch 1 2 3 4 % 4-4-86 __ 1115 180 185 209 185 0 94 100 86 94 58 4-4-86 1330 180 185 209 185 0 94 100 86 94 58 4-4-86 1645 178 187 202 183 0 94 100 86 94 58 

.4-5-86 0820 178 188 201 182 0 94 100 86 94 57 4-5-86 1030 176 188 201 181 0 94 100 86 94 57 From the table, the inspector determined that no abnormal leakages existed during the test perio No variations of the control room indicators is indicative of containment tightnes The major leak sources were isolated prior to the tes The containment mass points and total time points were plotted in figures 2 and 3 respectively as given by the process computer for the CILRT data collection and ca'.;ulation Even though the leakage values were negative, they were small in magnitude indicating a leak free containmen .

Based on the data points, the "As Left" CILRT appears to meet the acceptance criteria. Final determination is pending review of the summary technical report, which will include the LLRT results for the isolated penetration .3 Instrument Verification Test The instrument verification test was performed after the 24 hour leak rate test cy superimposing a known leakage of 3.62 SCFM as measured by the bypass flowmeter. The masspoints are plotted in figure 4, and 

.

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the total leakage which includes the superimposed leak was measured from the slope. Estimated results are as follows: Total Leakage = 0.0938 %/ day Superimposed Leakage = 3.62 SCFM = 0.1147 %/ day Therefore, CILRT = 0.0938 - 0.1147 = -0.0209 %/ day Since, 0.25 L = (0.25) x (0.1102) = 0.02755 %/ day tm l-0.0209 % day [ < 0.25 L =0.02755 %/ day t The result is acceptabl .0 CILRT Personnel Training and Qualifications The Qualifications Records of Test personnel were reviewed, and test personnel interviewed. Their qualifications met the requirements speci-fied in ANSI N 18.1-1971 " Selection and training of nuclear power plant personnel". They were knowledgeable of their responsibilities and tech-nical aspects of leak testin No unacceptable conditions were identifie .0 Tours The inspectors made several tours of the plant including the reactor building, primary auxiliary building, control room and plant exterior (containment, compressor, and CILRT data acquisition areas) in order to monitor the activities related to the preoperation for and performance of the CILRT. The inspectors noted no unusual or unacceptable condition .0 QA/QC Coverage During the preparation and initiation of the CILRT the inspectors verified QA/QC involvement. QA/QC was present during final containment walkdown and pretest briefing by the CILRT director. The inspectors verified that QA had a program of specific inspection items to verify before and during the tes No unacceptable conditions were identifie .0 Exit Meeting Licensee management was informed of the purpose and scope of the inspec-tion at the entrance interview. The findings of the inspection were periodically discussed and were summarized at the exit meetin Attendees at the exit meeting are listed in Section 1.0 of this repor At no time during the inspection was written material provided to the licensee by the inspectors. }}

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