IR 05000317/1988013
| ML20151B108 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 06/27/1988 |
| From: | Eapen P, Joe Golla NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20151B107 | List: |
| References | |
| 50-317-88-13, 50-318-88-13, NUDOCS 8807200245 | |
| Download: ML20151B108 (7) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION I
Report Nos.
50-317/88-13 50-318/88-13-Docket Nos.
50-317 50-318
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License Nos.
DPR-53 DPR-69 Licensee: Baltimore Gas and Electric Company P. O. Box 1475 531timore, Maryland 21203 Facility Name:
Calvert Cliffs Nuclear Power Plant, Units 1 and 2
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Inspection At:
Lusby, Maryland l
Inspection Conducted: May 26-27, 1988 Inspector:
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[M 4 - J 7- #d'
g eph (. Golla, ReacYor Engineer date Approved by:
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6h7/d Dr. P. K. Eapen, Chief, Special Test
'date Programs Section, EB, DRS Inspection Summary:
Inspection on May 26-27, 1988 : inspection Report Nos.
50-317/88-13 and 50-318/88-11'
Areas Inspected:
Routine unannounced inspection of test witnessing for the Unit 1 Containment Integrated Leak Rate Test (CILRT) and preliminary results review and follow-up on a previously identified open item for Unit 2.
Results: The CILRT proved the containment leak rate to be acceptable in both the as-left and as-found condition. Administrative control and QC coverage of test activities were found adequate. One open item (Unit 2) was closed.
8807200245 880707 PDR ADOCK 05000317 Q
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Details 1.0 Persons Contacted 1.1 Baltimore Gas and Electric Company
- 0. Bulich, Senior Engineer and CILRT Supervisor
- J. Lemons, Manager Nuclear Operations J. Reynolds, Operations QC
- K. Romney, QA Engineer
- D. Ross, Supervisor Test Equipment
- 0. Shaw, Licensing Engineer
- T. Sydnor, Principal Engineer
- L. Young, Test Consultant Bechtel 1.2 Nuclear Regulatory Commission
- D. Trimble, Senior Resident Inspector
- Denotes those present at the exit meeting on May 27, 1988.
2.0 Centainment Integrated Leak Rate Testing Unit 1 On May 26-27, 1988, the licensee conducted a periodic Containment Integrated Leak Rate Test (CILRT) at Calvert Cliffs Nuclear Power Flant Unit 1 as required by 10 CFR 50, Appendix J.
The test was conducted with containment isolation boundaries in an "As-Lef t" condition.
The test was performed in accordance with Surveillance Test Procedure M-622-1 "Integrated Leak Rate Test Unit 1 Containment," Revision 2, and utilized the test acceptance criteria and methodology stipulated in Bechtel Nuclear Topical Report, Rev 1 (BN-TOP-1) for short duration tests.
The inspector reviewed the test procedure and witnessed preparations and various portions of the "As-Left" CILRT.
The purpose of this inspection was to ascertain that the CILRT was conducted in compliance with the requirements and commitments referenced in the following sections, and that the test results met the acceptance criteria specified in the station procedures and Appendix J, 10 CFR 50.
The procedures were reviewed for their technical adequacy to perform the intended activities.
2.1 References Calvers Cliffs Nuclear Power Plant Technical Specifications
10 CFR Part 50, Appendix J, Primary Reactor Containment Leakage
Testing for Later Cooled Power Reacto :.
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- Final Safety Analysis Report (FSAR).
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Be:htel Nuclear Topical Report, rev. 1-(BN-TOP-1) November 1,
1972, "Testing Criteria for Integrated Leakage Rate-Testing of Primary Containment Structures for Nuclear Power Plants".
_USNRC Inspection and Enforcement Information Notice No. 85-71,
Containment Integrated Leak Rate Tests.
2.2 Documents Reviewed STP M-662-1 "Integrated Leak Rate Test Unit 1 Containment,"
Revision 2, dated May 24, 1988.
Operations QC Inspection Reports for the CILRT-various.
- Calibration certification information for CILRT
instrumentation.
CILRT Official Log of Events.
- Local Leak Rate Test results for the current outage.
- I-TEC-126 "Test Equipment Calibration Procedure,"
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Revision 0, dated November 21, 1985.
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2.3 Administrative Control of CILRT and Procedure Review l
l The inspector reviewed procedural sign-offs and the CILRT Log of l
Events and held discussions with the test supervisor to verify that:
l Test directors were designated and their responsibilities were
clearly defined.
The procedures were adequately detailed to assure satisfactory
performance.
Test prerequisites were met.
- All systems required to maintain the plant in a safe condition
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were operable and in their normal mode.
The inspector noted upon reviewing STP-M-662-1 "Integrated Leak Rate Test Unit 1 Containment" that a statement or sign-off concerning the containment close-out inspection was not included in the procedure.
Per 10 CFR 50 Appendix J, "A general inspection of the accessible interior and exterior surfaces of the containment structures and components shall be performed prior to any Type A test to uncover any
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evidence of structural deterioration which may affect either the containment structural integrity or leak-tightness." The licensee indicated this inspection was conducted prior to close out of con-tainment but a formal sign-off or test prerequisite did not-appear in the procedure. The licensee also indicated that a containment liner plate inspection was made per STP-M-665-1 "Containment Liner Plate Surveillance - Unit 1" which served to satisfy the requirement in 10 CFR 50 Appendix J.
The inspector reviewed the liner plate inspection procedure and found it adequate to meet the intent of the requirement in 10 CFR 50, Appendix J for a general inspection of the interior surfaces.
Inspection of exterior surfaces is addressed in the CILRT procedure. The inspector expressed concern about the inspection of the interior surfaces of containment not being addressed directly in
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the procedure considering it's regulatory significance with respect to 10 CFR 50, Appendix J.
The licensee then wrote a Temporary Pro-cedure Change to address the issue. The inspector found this acceptable.
l 2.4 Test Performance / Control The inspector witnessed portions of the following test activities:
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Containment pressurization and atmospheric stabilization.
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Eight hour CILRT data acquisition.
3.
Four hour instrument verification.
These activities were witnessed to verify that the CILRT was conducted in accordance with the test procedure and within the regulatory requirements of 10 CFR 50, Appendii J.
The inspector made several reactor building walk downs to inspect for the existance of artificial boundaries and boundaries showing evidence of leakage. Additionally, the licensee had leak crews throughout the reactor building during the initial stages of the test. Only minor leakages were identified which required no action to successfully complete the test.
The test was performed within the guidelines of the procedure.
Procedural precautions were adhered to and all test personnel interviewed were knowledgeable and competent to perform their duties. No unacceptable conditions were identified.
2.5 Test Instrumentation l
The inspector reviewed the calibration records for the resistance temperature detectors (RTDs), dew point instruments, precision pressure detectors, and the verification flow test meter. Their calibrations were found to meet applicable accuracy requirements
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(BN-TOP-1 requirements) and were traceable to the National Bureau of Standards.
It was also noted that the instruments had been
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calibrated within the 6 month period prior to the test, per the industry standard ANSI /ANS - 56.8-1981.
The inspector observed the operation of the automatic data collection system during the conduct of.the test.
No unacceptable conditions were identified.
2.6 Chronology of Events May 26, 1988 0215 Commenced pressurizatfor..
2120 Secured from pressurization.
2130 Start stabilization.
May 27, 1988 0400 Commenced CILRT.
1200 Completed 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> testing period, leak rate meets acceptance criteria.
1300 Commence verification leak rate test.
1700 Completed verification leak rate test, results satisfactory.
2.7 Temparature Stabilization The containment atmosphere must meet the following stabilization criteria per STP-M-662-1:
Once the containment is at test pressure, the containment atmosphere shall be allowed to stabilize for no less than 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
The atmosphere is considered stabilized when:
a)
The rate of change of average temperature is less than 1.0 F/ hour averaged over the last 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, or b)
The rate of change of temperature changes less than 0.5 F/ hour averaged over the last 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
The inspector independently calculated the rate of changes of the criteria a and b above and found that both were met. Criterion a was
.199 F/hr and criterion b was.076 F/hr.
This meets the criteria for temperature stabilization.
2.8 CILRT Results The inspector independently calculated the CILRT leak rate utilizing an NRC approved computer code.
A comparison of licensee and
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inspe: tor computed results is given below.
Results are in weight
%/ day.
Lam: Measured Leak Rate, UCL: Upper Confidence Limit 8 HOUR CILRT TOTAL TIME METHOD AS-LEFT LICENSEE NRC Lam
.006
.006 Lam + UCL
.074
.074 Acceptance Limit-10.150 10.150 These results indicate a successful as-left CILRT. Utilizing as-found and as-left local leakage (Type C) results the licensee has determined that the containment's as-found integrated leakage value is also within Technical Specification limits. A final test results evaluation is pending NRC review of the licensee's summary technical report on the test. The-8 hour CILRT was followed by a successful 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> verification test.
3.0 QA/QC Coverage The inspector discussed coverage of the CILRT with QA/QC representatives.
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It was determined that operations QC has provided coverage of selected CILRT activities such as valve lineup, leak chasing and temperature stabilization. The inspector reviewed several QC inspection reports on these activities.
Findings were well documented and effectively communi-cated to the cognizant test personnel. QA/QC coverage of CILRT activities
was found to be adequate.
4.0 Follow-up on Previously Identified Open Items Closed (50-318/85-33-01) Licensee arbitrarily extending the calibration interval for standard instruments used to calibrate local leak rate test (LLRT)-boy's.
During a.avember 1985 inspection of Unit 2 LLRT activities it came to the inspectors' attention that the due o'ates for standards used to calibrate LLRT instruments had been extended. The inspector at that time requeste'. the licensee to provide the basis and justification for these extensions. The licensee could not justify the extensions.
The licensee then immediately performed calibration checks for the two standards (dead weight testers) in question and verified that the instruments were still in calibration. Additionally, the flow standard used to calibrate LLRT flow instruments was sent back to the vendor for calibration.
This was also found to be in calibration.
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.y The licensee has changed Calvert Cliffs Ircstruction 120, "Calibration
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Program for Measuring and Test Equipment" to allow the test equipment
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supervisor to lengthen or shorten the equipment calibration period based on the past performance.of the instrument.
The instruction also requires that test equipment be calibrated at regular intervals and places a maximum extension on test equipment not to exceed 25% of the initial calibration frequency.
It-stipulates that a record shall be kept regarding original and new calibration dates and the supervisors'
justification for extending the calibration frequency.
The inspector D
found the provisions of Calvert Cliffs-Instruction 120 to be acceptable with respect to this issue. This item is closed.
5.0 Exit Meeting Licensee management was informed of the purpose and scope of the inspection at the entrance interview.
The findings cf the inspection were periodically discussed and were summarized at the exit meeting on May 27, 1988. Attendees at the exit meeting are listed in Section 4.0 of this report. At no time during the inspection was written material provided to the licensee by the inspectors. The licensee did not indicate that the inspection involved any proprietary information.