IR 05000338/1981009
| ML20003G699 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 03/20/1981 |
| From: | Brooks E, Burnett P, Butcher R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20003G698 | List: |
| References | |
| 50-338-81-09, 50-338-81-9, NUDOCS 8104300559 | |
| Download: ML20003G699 (4) | |
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UNITED STATES 8"
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NUCLEAR REGULATORY COMMISSION
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101 MARtETTA ST., N.W., SUITE 3100
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Report No. 50-338/81-09 Licensee: Virginia Electric and Power Company Richmond, VA 23261 Facility Name: North Anna Unit 1 Docket No. 50-338 License No. NPF-4 Inspection at North Anna site near Mineral, Virginia Inspectors: k b c r e
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E. H. Brooks Date Signed fk 1-19-if t R. C. Butcher Date Signed
~ ek J5248 Approved by:
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P! Blirfiett', Acfing Chief, Test Section Date Signed Division of Engineering & Technical Inspection SUMMARY
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Inspection on March 5-10, 1981 Areas Inspected This routine, announced inspection involved 76 inspector-hours on site in the areas of valve line-ups, calibration data, procedures, containment penetrations, test logs and drawings relating to the Containment Integrated Leak Rate Test (CILRT).
Resul';s No items of noncompliance or deviations were identified in six areas inspected.
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DETAILS 1.
Persons Contacted Licensee Employees
- W. R. Cartwright, Station Manager
- J. A. Stall, Engineer
- D. L. Benson, Superintendent Technical Services
- M. E. Fellows, Staff Assistant R. Bergquist, Instrumentation Supervisor J. Bowers, Computer Supervisor P.Perrine, Computer Technician G. A. Kann, Staff Engineer NRC Resident Inspector
- E. H. Webster
- Attended exit interview 2.
Exit Interview The inspection scope and findings were summarized on March 10, 1981 with those persons indicated in Paragraph 1 above. The inspectors summarized the purpose and scope of the inspection and the findings as detailed in the following paragraphs.
3.
Licensee Action on Previous Inspection Findings Not inspected.
4.
Unresolved Items Unresolved items were not identified during this inspection.
5.
Review of CILRT Procedure a.
The CILRT valve lineup was reviewed for conformance to 10 CFR 50, Appendix J.
One containment isolation valve vent path was found to be incorrect. On penetration 47 valve 1-IA-301 was shut and should have been open. The CILRT procedure, 1-PT-61.1 was changed to correct the lineup prior to the test.
b.
Various minor discrepancies were found (personnel sign offs not dated, discrepancies in test equipment part numbers, pretest weather data not entered), which were corrected prior to the test.
The inspectors had no further comments.
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6.
Review of Calibration Data a.
A review of test equipment calibration data sheets for the CILRT revealed that the test equipment was calibrated based on the vendors serial number. but the CILRT procedure (1-PT-61.1) called out the licensee instrument number. There was no documentation showing the vendor equipment of a given serial number was the same equipment as the licensees instrument number.
Visual confirmation was accomplished on that equipment that was questioned. The licensee agreed to provide the necessary documentation to cross connect a vendor serial number to the licensees instrument number by 1 April,1981.
This is an inspector followup item (338/81-09-01).
b.
There are no post test calibration checks on the CILRT test equipment.
It is standard engineering practice to calibrate test equipment periodically to verify the validity of tests conducted with given test equipment. Currently this is not done for the CILRT test equipment.
The licensee agreed to develop a post test calibration program that will show confidence that the test equipment was still in calibration at the end of the CILRT. This program is to be in effect by 1 April, 1981. This is an inspector follow up item (338/81-09-02).
7.
Review of the CILRT Log The inspectors reviewed the log book for completeness and accuracy. The inspectors had no comments.
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8.
Processing of CILRT Data The test equipment input was to the unit 1 computer, the unit 2 computer acted as a backup to unit 1, where the data were accumulatad and the containment air mass was calculated.
The data were then manually entered into an off-line computer in Richmond. There the leak rate was determined by calculating the slope of the mass versus time data for a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
A least-squares curve fit of the data was used. This procedure was observed in operation and the inspectors had no comments.
9.
CILRT Test Results The containment was pressurized to approximately 39 psia and allowed to stabilize.
At approximately 2:00 a.m.
on March 10, 1981 the test was started and at approximately 2:00 a.m.
on March 11, 1981 the test was completed with the following results Leakage Rate (percent / day) = 0.012612 Leakage Rate with the Upper Confidence Limit (percent / day) = 0.016555 Technical Specification Limit (percent / day) = 0.10000 The verification test was then initiated using the repressurization method.
388.9 pounds mass / hour was inserted with a final difference between the
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computed air mass reading and the verification instrumentation reading of 103.9 pounds mass / hour. This was within the allowable 0.25 La limit of 138.7 pounds mass per hour.
The above CILRT test results were acceptable, but the non-vented containment isolation valve type
'C' test results must be added to the CILRT results.
This total value must be less than 75% La.
The results of the ILRT including the adjustments for type "C" testing will be submitted in a test report to the Commission.
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