IR 05000410/1986016
| ML17055B727 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/22/1986 |
| From: | Anderson C, Kucharski S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML17055B726 | List: |
| References | |
| 50-410-86-16, NUDOCS 8606030233 | |
| Download: ML17055B727 (22) | |
Text
U.S.
NUCLEAR REGULATORY COMMISSION
REGION I
Report No.
50-410/86-16 Docket No.
86-16 Permit No.
CPPR-112 Licensee:
Nia ara Mohawk Power Cor oration 300 Erie Boulevard S racuse New York 13202 Facility Name:
Nine Mile Point Unit 2 Inspection At:
Scriba New York Inspection Conducted:
A ril 7-15 1986 Inspector:
(
S.
Ku harski Resident Inspector date Approved by:
C.
nderson, Chief, Plant Systems Section, EB, DRS date Ins ection Summar:
Ins ection on A ril 7-15 1986 Ins ection Re ort I -o
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"dA:
I,
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I I I testing program including procedural review of the preoperational Integrated Leak Rate Tests ( ILRT's) and the Structural Integrity Test (SIT); ILRT and SIT witnessing; ILRT and SIT test review; and general tour of the facility.
Results:
No violations were identified.
PDR hooey 8606030233 05000410
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DETAILS 1.0.
Persons Contacted Nia ara Mohawk Power Cor oration NMPC R.
B. Abbott, Unit 2 Station Superintendent
- D. Brassard, Start Up and Test Engineer
- R. J.
Cohen, Manager of Construction
- J. J.
Dominey, guality Assurance G. J. Doyle, Supervisor, equality Engineering W. L. Jansen, Manager, Nuclear guality Assurance Operations E.
R. Klien, Manager Project Engineer Design
"T..B. Lee, Special Project T. J. Perkins, General Superintendent R. Randall, Supervisor Technical Support
- M. J.
Ray, Manager Special Projects
"J.
R. Spadafore, Technical Department - Operations
- T. M. Weahly, Special Projects W.
R. Yaeger, Manager of Engineering 1.2.
Stone and'Webster En ineerin Cor oratiom SWEC
~J.
Drake, Start Up Special Project Supervisor
~B. Kuechler, Supervisor
- B. Perry, Engineer 1.3. Public Service Commission PSC
- P.
D. Eddy, Site Representative Nuclear Re ulator Commission NRC R.
Gramm, Senior Resident Inspector
- S. Hudson, Senior Resident Inspector C. Petone, Lead Reactor Engineer.
~Denotes those present at the exit interview on April 15, 1986 2.0.
Containment Inte rated Leaka e and Structural Inte rity Test Documentation Review.
2.1
~ Documents Reviewed N2-POT-201, Primary Containment Integrated Leak Rate Test, Revision 1, March 20, 1986.
MS.0201.001, Structural Integrity Test, Revision 2, February 26, 198 Technical Specifications, 3.6. 1.2, 4.6. 1.2, and 3.6.2. l.b.
Sections 6.2.6 and 14.2 of the FSAR Stone and Webster calculation 218, ILRT Weight Factors -
CMS System, Revision 0, March 11, 1986.
CILRT Log Book CILRT Test Results SIT Test Results Calibration Records for CILRT/SIT instrumentation SQA-S-115-86, Integrated Leak Rate test Prerequisites N2-POT-201/1, Revision 1, March 31, 1986.
QAP 10.03, Quality Assurance Department Surveillance Activities, Revision 1, October 11, 1985.
Selected Piping and Instrument Drawings.
.2. ~fR The inspector reviewed the test procedure and related documents for technical adequacy and to determine compliance with the regulatory requirements of Appendix J to
CFR 50, Technical Specifications and applicable industry standards.
The inspector witnessed a large portion of the CIRT/SIT, verification test and bypass leakage test.
The inspector also performed independent measurements and calculations of the test results.
2.3.
Procedure Review The inspector reviewed the CILRT and SIT procedures for technical adequacy and to ascertain compliance with requirements of the Tech-nical Specifications and
CFR 50, Appendix J.
The inspector reviewed the valve lineups for piping penetrations on a random sampling basis.
This review was to insure that systems were properly vented and drained to expose the containment isola-tion valves to the test differential pressure with no artificial boundaries.
No unacceptable conditions were identifie.4.
CILRT/SIT Instr umentation The inspector reviewed the calibration records for the resistance temperature detectors (RTD's),
dew point instruments, precision pressure detection, and verification test flow meters for the CILRT.
The calibration records were found to meet applicable accuracy requirements, and were traceable to the National Bureau of Standards.
The inspector noted that the standard used to calibrate the verifi-cation flow meter was last calibrated in July 27, 1983.
The inspector questioned the calibration period of the standard and found it to be a five year period by verbal confirmation.
The licensee agreed to send the NRC the required documentation needed to confirm the calibration of the standard.
The inspector also reviewed the calibration records for strain gages and linear variable differential transformers (LVDT's).
The calibration prior to the SIT were found to meet applicable accuracy requirements and were traceable to the National Bureau of Standards.
No acceptable conditions were identified.
2.5.
CILRT/SIT Chronolo Apr i l 7, 1986 1935
Started pressurization of the Containment. for the SIT portion of the test.
2007 -
Reached 5.5 psig - held at this pressure to perform leak walk down.
2250 -
Commenced pressurization up to first hold point for SIT.
April 8, 1986 0020 Notified Teledyne of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period at 10.24 psig.
0200 Teledyne and Stone and Webster personnel completed Data recordings.
0218 Commenced pressurization up to second hold point to 20 psig.
0358
Commenced 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period at 20.25 psig.
0503
Teledyne personnel started data taking.
0605-Commenced pressurization up to third hold point at
psl Commenced 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period at 30.45 psig.
0817 0925 Teledyne and SSS were notified of the end of the stabilization period for data taking.
Commenced pressurization up to the fourth hold point at 40 psig.
1024
Commenced stabilization for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
1124
End Stabilization period notified Teledyne and SSS.
1329 Started pressurization up to peak containment pressure.
1506
Reached peak containment pressure of 52.73 psig.
1515 -
Preformed leak check of outside penetration.
1615 -
Started Stabilization period.
1715 -
Notified Teledyne to commence data taking.
1830
Started to depressurize at increments of 10 pounds.
2030
Held at 40.0 psig for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period.
2145
Teledyne completed data collection.
2147
Started to depressurize.
2301
Held at 30 psig for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period.
Apri 1 9, 1986 0040 Teledyne completed data collection, commenced depressurization to 20 psig.
0200
Held at 20 psig for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period.
0315-0450 0601 Teledyne completed data collection, commenced depressurization to 10 psig.
Held at 10 psig for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period.
Teledyne completed data collection, commenced depressurization to 0 psig.
0815
Held at 0 psig for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> stabilization period.
0930 Teledyne completed data collection.
Preparations star ted for CILR April 10, 1986 1318 1618 2035 2213 2330 April 11, 1986 2100 2213 April 12, 1986 0013 0513 0557 0900 0950 1120 1340 1805 2215 Started pressurization for CILRT 20 pound test.
Reached test pressure 20 psig started 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> stabilization period; Temperature stabilization period completed.
Start of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> CILRT at reduced pressure.
Data taken at 30 minute intervals instead of the
minute intervals proposed because of instrumentation problems.
Three penetrations were discovered to be incorrectly lined up for test and a penalty will be taken on the following penetrations Z-34B, Z-41, and Z-46C.
Completed 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ILRT ~
Started verification test established leak rate is 6.0 SCFM.
Completed verification test.
Started depressurization at approximately 10 psi/hr.
Primary Containment depressurized.
Penetrations Z-34B and Z-41 were realigned.
Completed work on Dew Cells.
Started pressurization for CILRT 40 pound test.
Reach test pressure at 56.003 psig.
Started stabilization period.
Satisfied temperature stabilization - Started 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test.
April 13, 1986 2215 Completed type A test.
Started the superimposed flow of 11.5 SCFM.
2315
Started verification tes April 14, 1986 0415 0539 1045 1100 Completed verification test.
Started depressurization from 40 psig.
Depressurization completed.
Suppression pool hatches open.
1220 Drywell/wetwell vacuum breakers unblocked and lined up for bypass leakage test.
1505 1545 Started Drywell pressurization.
Pressure at 7.445 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
1645 Notified Teledyne to commence data collection for Drywell Floor Structural Integrity test.
1719 1745 1845 1902 1925 2025 2043 2118 2218 2218 2238 2312 Commenced pressurization to 13 psig plateau.
Pressure a+ 13.449 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
Notified Teledyne to commence data collection.
Commenced pressurization to 19 psig plateau.
Pressure at 19.41 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
Notified Teledyne to commence data collection.
Commenced pressurization to 25 psig.
Pressure at 25.44 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
Notified Teledyne to commence data collection.
Completed 25 pound bypass leakage test'.
Started drywell depressurization.
Pressure at 19.44 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
April 15, 1986 0012 0035 0116 Notified Teledyne to commence data collection.
Began depressurization to 13 psig.
Pressure at 13.495 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold perio Notified Teledyne to commence data collection.
0234
Began depressurization to 7 psig.
6307
Pressure at 7.55 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
0407
Notified Teledyne to commence data collection.
0424
Began depressurization to 3 psig to perform 3 pound bypass leakage test.
0459
Perform the bypass leakage test at 3.3 psig.
0544
Began depressurization to 0 psig.
0610
Pressure at 0 psig, started 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> hold period.
0710
Notified Teledyne to commence data collection.
2.6. Test Performance/Control The majority of the test was performed within the guidelines of the procedure.
Procedural precautions were adhered to, including those related to manipulation of containment boundaries after the commence-ment of testing.
Two problems did occur:
one during the reduced pressure (20 psig) test and one during the full pressure (40 psig)
test.
Both problems dealt with the instrumentation and were handled adequately by the licensee.
The problems that occurred during the CILRT had to do with the dew cells.
During the reduced pressure test a review of the five minute trend log indicated that two of the dew cells would go into a balance
.
mode about four minutes before the hour and another dew cell would start at 6 minutes after the hour.
The observed cycle each sensor follows when in this mode is to heat up to 110'F, then cool down to
F.
This rebalances the mirror surface.
The computer will capture moisture values even if the sensor is in this balance mode, which will not permit trending.
Since the balancing mode cycle lasts approximately 7 to 7.5 minutes, rather than adjusting the values, the computer and the IBM program were restarted to cycle around the balance mode.
After the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> reduced pressure test the I&C per-sonnel adjusted the dew cells to perform the balance mode every two hours and they also tried to incorporate a hold feature which only allows the dew cell to record the temperature before the balance mode as the temperature during the balance cycle.
During the performance of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> full pressure CILRT the dew cells went into their balancing mode every two hours as adjusted, but one dew cell failed to recover from its balancing cycle until the next time it self adjusted and recovered.
Also the hold feature for when the dew cells enter the balancing mode failed to operate
Because the instrumentation was trending correctly through out most of the test and there were no problems during the verification por-tion, the data was acceptable.
The licensee discovered after the test that the control units for the dew cells were installed inside the containment.
This caused the problems with the instrumentation.
The licensee agreed to relocate the control units for the dew cells outside containment.
This is an unresolved item (86-16-01)
pending relocation of the dew cells.
The inspector had no further questions.
2.7. Test Results Reviewed The licensee performed two integrated leak rate tests.
The initial test was performed at a pressure of 20 psig, which is equivalent to 0.5 P
, to measure the leakage rate at the reduced pressure.
A a'econdtest was then performed at full pressure (39.75 psig), to establish a leakage rate at full pressure.
Based on the leakage characteristics yielded by these two measure-ments a maximum allowable leakage rate can be established by the licensee for future reduced pressure testing.
The calculated leakage rate at the upper 95% confidence limit was 0. 129 weignt percent per day for the 20 psig test and 0. 197 weight percent per day for the 39.75 psig test.
Based on the formulas referenced in 10 CFR 50, Appendix J, Section III.4(a)(iii), the maximum allowable leakage rate at reduced pressure cannot exceed 0.72 weight percent per day based on 1.0 La.
At 0.75 La, the maximum allowable leakage rate cannot exceed 0.54 Weight percent per day.
The inspector performed an independent calculation of the test results using the raw data from the test to estimate the accuracy of the licensee's leak rate calculations.
The results were as follows.
LTM(20psig)
UCL(20psig)
LAM(39.75psig)
UCL(39.75psig)
NMPC NRC 0.124 0.098 0.129 0.116 0.194 0.194 0.197 0.198 The i'nspector concluded that the licensee's calculations were appro-priately performed and accurate.
Final computation of the total integrated leak rate is dependent upon the addition of local leakage values of penetrations not included in the test, and of water level corrections.
These corrected values will be reported in the CILRT final report submitted by the license << I A
Both CILRT's were followed by successful superimposed leak verifi-cation tests.
For the reduced pressure test the licensee imposed a
leak of 360 SCFH or 0.723 weight percent per day on the existing leak.
The measured verification test leak was 0.806 weight percent per day.
The test result was within the acceptance criteria band (0.672<Lt<1.022).
After the full pressure test, the licensee imposed a leak of 690 SCFH or 0.878 weight percent per day.
The measured verification test leakage was 0.9466 weight percent per day, which was within the acceptance criteria band (0.8455<La<1.2845).
The inspector verified this result by independent calculations.
No unacceptable conditions were identified.
3.0. Observation of Structural Inte rit Test SIT The structural integrity test of the containment was performed between April 7, 1986 and April 15, 1986.
The test consists of two parts, the containment liner structura'1 test and the Drywell floor structural test.
The pressure reached 52.73 psig at 3:06 p.m., April 8, and the contain-ment was depressurized at 8: 15 a.m., April 9.
The inspector reviewed SWEC specifications and the implementing test procedure for conformance to the licensee's commitment in the FSAR, section 3.8. 1.7 to Regulatory Guide 1. 18 Revision 1.
The inspector interviewed cognizant licensee, SWEC, and Teledyne personnel to ascertain and evaluate their knowledge of requirements to conduct the test.
During the test the'nspector observed crack mapping prior to and during several test intervals.
At available locations, the exterior of the containment concrete wall was checked by personnel during the test.
These observations indicated that the containment structural integrity test was conducted in accordance with R.G.
1. 18 and demonstrated licensee involvement in assuring quality.
As specified by R.G.
1. 18, the NRC will review the final report at a later date for comparison of radial, vertical and strain gage test measurements; the estimated accuracy of the measurement; and deviations and the contain-ment's safety margin as deduced from the test results.
The inspector made several tours of various areas of the site to observe test activities, other work in progress and general housekeeping.
During these tours the inspector examined the containment system boundaries, component tagging and instrumentation used to support the CILRT.
No unacceptable conditions were identified.
5.0.
Inde endent Calculations The inspector performed independent calculations of the test results of the CILRT and the subsequent verification tests.
Details are included in Section 2.7 of this repor.0.
gAA/
I During the performance of the CILRT/SIT the inspector verified QA involve-ment in test monitoring.
The QA personnel were knowledgeable of their responsibilities and duties and how to report their findings.
No unacceptable conditions were identified.
7.
A meeting was held on April 15, 1986 to discuss the scope and findings of the inspection as delineated in this report ( see Section 1 for attendees).
At no time during this inspection. was written information provided to the license Jtf J
I