IR 05000271/1979015
| ML19262B937 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 11/27/1979 |
| From: | Sanders W, Lester Tripp NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19262B938 | List: |
| References | |
| 50-271-79-15, NUDOCS 8001220247 | |
| Download: ML19262B937 (7) | |
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT Region I Report No.
Sn_971/70 18 Docket No.
sn_p71 License No.
npp-28 Priority
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Category c
Licensee:
Vermont Yankee Nuclear Power Corporation 20 Turnpike Road Westborouah, Massachusetts 01581 Facility Name:
Vermont Yankee Nuclear Power Station Inspection at:
Vernon, Vermont Inspection conducted:
October 15-18 and 30 and 31,1979 Inspectors: MI rd
J/w J4./97f W. F. Sanders, Reactor Inspector date' signed'
date signed date signed Approved by: Afd.4 I b
[
C - 27/#7/
n i.. E. Tripp', Chief, Ehgineering Support Section da te 'si gned No. 1, RC&ES Branch Inspection Summary:
Inspection on October 15-18 and 30 and 31, 1979 (Recort No. 50-271/79-15)
Areas Inspected:
Routine, unannounced inspection of the inservice inspection pro-gran and the implementation of the testing and examination reauirements for this refueling outage.
An inspection was also made of the torus modification program and the quality related activities associated with the welding of the support column gussets to the suppression pool torus.
The inspection involved 34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br /> onsite by one regional based inspector.
Results:
No items of noncompliance or deviations were identified.
Region I Fonn 12 k7b4 l52 (Rev. April 77)
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DETAILS 1.
Persons Contacted Yankee Atomic Electric Company (YAEC)
- L. X. Bozek, Operations, Quality Assurance Department
- W. F. Conway, Plant Superintendent
- R. W. Burke, Engineering Support Supervisor
- J. E. Cade, Technical Assistant
- W. A. Murphy, Assistant Plant Superintendent
- D. C. Girroir, Engineering Assistant W. A. Limburger, ISI Coordinator
- J. P. Pelletier, Maintenance Supervisor General Electric Company, Installation and Service Engineering Division (I&SE)
R. W. Wagner, Quality Assurance Supervisor
- denotes those present at exit interview.
2.
Plant Status The plant was in a cold shutdown mode for refueling, maintenance, inservice inspection and torus modification work outlined in the suppression pool long range program.
3.
Inservice Inspection Proaram The inservice examination program completed this outage represents the last inspection of period 2.
Commencing January 30, 1980 updated Technical Specifications are to be implemented with the effective edition of the ASME Section XI being the edition and addenda published in Code of Federal Regulations 10 CFR 50.a(b).
This date will also be the start of period 3 of the first 10 year inspection interval.
4.
N.D.E, Procedure Review (ISI Program)
The inspector reviewed the following nondestructive testing procedures for compliance with the requirements of ASME Section XI Code,1974 Edition; Summer 1975 Addenda and Appendix III Summer 1976.
Some of the procedures have been reviewed on previous inservice inspection at plant sites, there-fore, it was only necessary to review this and other changes designated k784iM
by a revision and the applicability of the procedure to the component being tested. There were no items of noncompliance identified regarding the technical content with respect to different parts of the ASME code. These procedures are listed below:
80A3223 Revision 0 - Manual UT Examination Procedures for Reactor Vessel Nozzle Inner Radius Area.
YA-UT-1-0 - General UT Procedure Used with Above.
YA-UT-14-0 - Recirculating Piping Examination.
YA-UT-10-0 - Head Spray Examination.
YA-MP-1 Revision 1 - Magnetic Particle Examination.
YA-PE-2 Revision 7 - Liquid Penetrant Examination.
No items of noncompliance were identified.
5.
Personnel Qualification Records The inspector audited the qualification records of randomly selected per-sonnel involved with the performance of the nondestructive examination during the current outage.
The records for four N.D.E. technicians were examined for compliance to the requirements of SNT-TC-1A, ANSI N45.2.6 and NES, QA Manual 80A9021 with Procedure 25-PQ-002 for the disciplines in which the individual was trained and certified.
The physical examination records were current, including visual acuity and color vision tests and included the necessary restrictions where required for the individual examiners.
Qualification records were selected for examiners in the following positions:
R.T.
U.T.
M.T.
L.P.
N.D.E. Examiner A - Level III Level III Level III Level III N.D.E. Examiner 8 - Level II Level II Level II Level II N.D.E. Examiner C -
Level II Level II Level II N.D.E. Examiner D - Level II No items of noncompliance were identified.
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6.
N.D.E. Data and Records The inspector reviewed the test data of ultrasonic examination results for randomly selected welds. The records show that the tests were performed in accordance with the approved program and written procedures, calibrations performed as required and the data evaluated by the licensee Level III examiner with delegated responsibility.
Data for the following welds were reviewed:
Main Steam Line - N3A-SW/MS-7A N3C-SW/MS-7C High Pressure Coolant Injection - MS-4A - Weld FlA MS-4A - Weld F3A Core Spray Line "B" - M-CS-4A - Weld MF5b MF5c MF5d MF6 RHR Line A - RHR 32 Weld No. 3 Recirculation Ring Header - Weld 16A Weld 49 Recirculation Loop "B" - Weld No. 56 Weld No. 57 Weld No. 57b Weld No. 58 Head Spray RHR 19 - Weld No. F4 Weld No. F4A Weld No. F5 Weld No. F6 No items of noncompliance were identified.
7.
Torus Modifications An inspection was made of the quality related activities associated with the work performed on the torus support columns, outlined in the licensee Engineering Design Change Request (EDCR) No. 79-T. The modification of the torus structure includes a strengthening of-the support columns as part of the long term program to increase the factor of safety to 4.
This is to be accomplished by the addition of gusset strength members on the inside and outside of each of the 32 support columns.
Each of the (64)
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gussets are attached to the pressure boundary torus shell by wsiding to all weld metal pads.
The pads are completed using a temper bead tech-nique and examined with magnetic particle examinations prior to the attachment of the gussets.
The welding is designed to the requirement of ASME Section III, Subsection N.F., Summer 1977 Addenda and part of the long term program which the licensee is committed to complete by December 1980.
The work completed during this outage consist of the following summary:
20 ground depressions in the torus wall which were measured to be
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less than nominal wall thickness and greater than minimum wall.
The cause of these was attributed to surface defects, arc strikes and other blemishes.
These areas were restored by buffing the base metal, MT of base metal, welding, X-ray of the repaired area and examined using a ultrasonic procedure.
64 weld metal pads were welded to the torus shell using a automatic
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welding process.
The pad was formed by applying two layers of weld metal.
The second layer was closely controlled to perform a temper-ing action to the initial layer.
The pad was examined using magnetic particle.
44 gussets were welded to the pads and all have been examined by
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magnetic particle techniques.
None of the gussets were welded to the column.
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It was noted that Specification V41-79-1 Revision 1 required the
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final examination of welds to the torus shall be greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after complettion of the final welds.
8.
Radiography Inspection Randomly selected radiographic film were examined using a high intensity viewer to ascertain the following quality attributes and for compliance with ASME Section V, 1974 Editi_on including Winter 75 Addenda.
Weld pad quality.
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Base metal condition.
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Presence of cracking.
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Penetrameter selection.
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Film placement.
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Geometric unsharpness.
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Visibility of penetrameter essential hole.
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The radiography was performed to RT procedure 18XA9601, however, due to the geometry and relationship of the 1 1/2 thick ring girder inside of the torus behind the weld pad and the necessity to X-ray through struc-tural welds on an angle to examine the pad welding, it was determined by the licensee to supplement the RT with an ultrasonic examination on the outside.
The inspector examined the film for the following column pads to determine quality and interpretation:
llB 16B 18B 24A 13B 17B 21B 28A No items of noncompliance were noted.
N.D.E. Records An examination of approximately 15% of the nondestructive examination records were reviewed for satisfactory completion of tests on the follow-ing column welds:
5b 7b 12a 21b 27b 6b 11b 15b 22a 31a No items of noncompliance were identified.
9.
Nonconformance Reports An inspection was made of randomly selected nonconformance reports to as-certain the effectiveness of the quality control effort in the identifica-tion and resolution of nonconforming conditions.
18 reports were reviewed for proper identification and location of component, specific description of the condition, recommended corrective actions and authorized approvals.
No items of noncompliance were identified.
10.
Procedure Review The following procedures which relate to the modification of the torus support columns were reviewed to ascertain whether the contractual and code requirements were defined in the workable procedures.
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VY-1-79-1, Column Modification and Torus Repair VY-79-1-5, Revision 0, Quality Reporting System I&SE - 18XA 7007, Revision 3, Quality Reporting System I&SE - 18XA 71206, Revision 0, Corrective ~ Action Procedure I&SE - 18XA 71204, Revision 0, Calibration of Measuring and Test Equipment liSE - 18XA 9700, Revision 0, Magnetic Particle Examination I&SE - 18XA 9802, Revision 0, N.D.E. Visual Examination I&SE - 18XA 9601, Revision 0, R.T. Examination of Welds I&SE - 18XA 9501, Revision 0, UT Test for Thickness I&SE - 18XA 8402, Revision 2, Liquid Penetrant Inspection VY-79-1-7, Arc Strike Removal VY-79-1-6, Etching Procedure, Ammonium Persulphate VY-79-1-5, General Welding Proceaure VY-79-1-llP, Revision 0, SMAW, Procedure Qualification (PQ) for Temper Bead No items of noncompliance were identified.
11.
Exit Interview At the conclusion of the inspection on October 31, 1979, a meeting was held at the site with representatives of the licensee.
Attendees at this meeting included personnel whose names are indicated in Paragraph 1.
The inspector summarized the results of the inspection as described in this report.
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