IR 05000293/1993004
| ML20045A526 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 05/07/1993 |
| From: | Gray E, Mcbrearty R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20045A524 | List: |
| References | |
| 50-293-93-04, 50-293-93-4, NUDOCS 9306110030 | |
| Download: ML20045A526 (4) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION I
REPORT NO.
50-293/93-04 DOCKET NO.
50-293 LICENSE NO.
DPR-35 LICENSEE:
Boston Edison Company FACILITY NAME:
Pilgrim Nuclear Power Station INSPECTION AT:
Plymouth, Massachusetts INSPECTION CONDUCTED:
April 12-16,1993
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h*d/4,/993 INSPECTOR:
R. A. McBrearty, Reactor %ineer DMe '
Materials Section, EB, DRS Ib !i3 APPROVED BY:
E. H. Gray, Chief, Materials Section Date EB,DRS 9306110030 930524 PDR ADOCK 05000293 G
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Areas Inspected: An announced inspection was conducted of the inservice inspection (ISI)
program and related activities to ascertain that those activities were conducted in accordance with applicable ASME Code and regulatory requirements. The inspection included portions of the ISI program, observations of ISI in progress, and quality assurance involvement with inservice inspection activities.
Results: The licensee's ISI program is being implemented in compliance with ASME Code and regulatory requirements. QC surveillances are performed by individuals who are knowledgeable of the activity they have been assigned to observe and include Level III individuals. Nondestructive examinations are performed in accordance with licensee approved procedures by properly qualified examiners.
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DETAILS 1.0 INSERVICE INSPECTION (ISI) PROGRAM (INSPECTION PROCEDURE 73051)
The Pilgrim Nuclear Power Station is in its second 10-year inservice inspection interval, third period, refueling outage #9. Examinations scheduled for completion during the next mid-cycle outage and refueling outage #10 will include major reactor pressure vessel weld examination, and the remaining examinations required to complete the second 10-year ISI program plan. The current second interval program plan meets the requirements of the ASME Boiler and Pressure Vessel Code,Section XI,1980 Edition, including Winter 1980 Addenda.
The Boston Edison Company maintains its 10-year program on a hard copy and also on a computer data base. Tracking program progress and maintaining its status is expedited with the use of the computer, and that should enhance the licensee's ability to confirm program completion at the appropriate time.
2.0 NONDESTRUCTIVE EXAMINATION (NDE) IMPLEMENTING PROCEDURES (IP73052)
Selected NDE implementing procedures were inspected to ascertain compliance with code and regulatory requirements, and for technical adequacy. The following procedures were included in the inspection:
ABJ AMDATA Procedures
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BECO-AMD-002, Revision 1, " Ultrasonic Procedure for Manual Sizing and Evaluation of IGSCC"
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BECO-AMD-003, Revision 0, " Ultrasonic Imaging System and Manual Procedure for Weld Overlay Inspection" BECO-AMD-004, Revision 1, " Ultrasonic Detection Procedure for Discrimination of
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BECO-AMD-006, Revision 1, " Manual Ultrasonic Detection Procedure for Discrimination of IGSCC in Dissimilar Metal Welds" f
Boston Edison Company Procedures
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Quality Control Instruction, QCI No. HQ-19, Revision 0, " Detection and Discrimination of IGSCC" L
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Quality Control Instruction, QCI No. 50.20, Revision 4, Change Notice A, " Magnetic
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Particle Examination"
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Quality Control Instruction, QCI No. 50.84, Revision 0, " Ultrasonic Recording
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Criteria for Recordable Indications Detected During an IGSCC Examination" General Electric Comoany Procedure GE-UT-102, Revision 4, (Pilgrim Nuclear Power Station Temporary Procedure No.
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TP 93-087), " Procedure for Manual Ultrasonic Examination of Similar and Dissimilar Piping Welds for IGSCC" Quality Control Instruction 50.84 was written to respond to the inspector's questions regarding data generated during the October-November 1992 mid-cycle outage and is intended to clarify data recording requirements when performing examinations for the detection of IGSCC. Change Notice A revised the magnetic particle data sheet to include information relative to the magnetic yoke used for the examination. The required information will enhance the ability to reproduce the examination and examination results.
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Based on questions raised by the inspector, the licensee concluded that portions of procedure BECO-AMD-003 needed clarification. The size and location of calibration reflectors needed clarification as did the method for measuring the remaining ligament of uncracked metal.
The ABB/AMDATA Level III at the site initiated a revision to the procedure to implement the licensee's request. At the conclusion of this inspection, the document was still in the revision process, and, as is true of all NDE procedures used at Pilgrim, it must undergo the licensee's review and approval for use at the site.
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Conclusions The inspected procedures were generally well written and complied with applicable code and regulatory requirements. The procedures related to ultrasonic examinations for the detection of IGSCC followed the EPRI guidelines for those examinations and clearly stated the requirement for the special training and qualification of examination personnel identified in NUREG 0313, Revision 1, and Generic Letter 88-01.
3.0 INSERVICE INSPECTION DATA (IP73755)
Data related to ASME Code,Section XI, required examinations were inspected to ascertain that examination findings were properly documented, and that the results were evaluated and -
dispositioned in compliance with applicable requirements. Data associated with the following components were selected for review:
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14-B-17, Core spray system pipe to penetration weld
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10-E207B-N4-3, Residual heat removal system nozzle to pipe weld GB-10-12HLl(4), Residual heat removal system hanger lug
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Weld 14-B-17 was subjected to ultrasonic examination for the detection of intergranular stress corrosion cracking (IGSCC). No recordable indications were noted. The two remaining items underwent magnetic particle examination.
The magnetic particle examination of weld 10-E207B-N4-3 detected a linear indication,-
which was evaluated and determined to be rejectable per the acceptance standards of ASME Section XI, Table IWB-3514-2. Nonconformance report (NCR) No.92-106 was issued to track the rejectable condition. The defect was removed and a magnetic particle examination
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was performed of the excavation to verify defect removal. Ultrasonic thickness measurements were performed before and after the defect removal process to monitor the amount of metal removed, and to assure that the minimum wall thickness was not violated.
The NCR was closed based on the successful completion of the required work and nondestructive examination.
The hanger lug examination showed that the component was free of recordable indications.
A notation on the data sheet stated that the examination could not be performed completely because of obstructions that limited access to the examination equipment. A sketch included in the data package identified the nature and extent of the obstructions.
Conclusions
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The ISI data, which were inspected, complied with applicable requirements regarding the informatior included on the data sheets, and confirmed the acceptability of the related component. The licensee's program for documenting nonconforming results was followed,
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and the documentation identified the licensee's actions taken to restore the associated item to an acceptable condition. Limitations to examinations were identified as to their nature and extent, and the documentation was included in the associated data package.
4.0 INSERVICE INSPECTION ACTIVITIES (IP73753)
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The ultrasonic examination of welds on the Reactor Water Cleanup System replacement piping was observed by the inspector to ascertain that the examinations were performed in r
compliance with ASME Code procedural and regulatory requirements. The examination of the following 4" diameter schedule 80, type 316 stainless steel welds were included in the
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inspector's observations:
EA-12-27R, -28R, -29R, -30R, -31R, -32R, FWIR, and FW2R
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General Electric Company personnel performed the weld examinations that included the straight beam (0 ) examination of base material through which the sound will travel during angle beam examination (which is a code requirement for the preservice ultrasonic examination of welds). That straight beam examination was performed to identify the presence of laminar reflectors that may interfere with the performance of the 45' angle beam examination. Weld profiles were obtained at four locations, 90' apart on the outside surface of each weld, and thickness measurements were made at those locations. The examinations were performed to satisfy ASME Code,Section XI, preservice examination requirements and, additionally, to provide baseline data for future IGSCC examinations.
The inspector confirmed that applicable requirements, including examination angle, frequency, transducer size, and scan speed were complied with. Further, the examination equipment calibration was accomplished using the appropriate ultrasonic calibration block.
Overall, the examinations were performed in compliance with applicable procedural and regulatory requirements.
Qualification / certification records of personnel employed by the licensee's ISI vendors, Stone and Webster, ABB/AMDATA, and the General Electric Company, who performed nondestructive examination at Pilgrim, were inspected to ascertain that those personnel were certified to the level of competence commensurate with their assigned duties.
The records confirmed that the individuals were properly certified in accordance with applicable provision of SNT-TC-1 A, the governing document, to the appropriate level of competence. Examiners employed by Stone and Webster and General Electric were responsible for performing ultrasonic examinations for the detection of IGSCC. Those individuals, in addition to being SNT-TC-1 A certified, were listed on the latest EPRI Registry of Qualified Personnel for UT ofIGSCC.
Prior to the current refueling outage, the licensee performed audits of ABB/AMDATA and General Electric to determine whether their program for qualifying and certifying nondestructive examination (NDE) personnel was acceptable. The licensee's NDE level III
performed the audits at the site and at the ABB/AMDATA office at Windsor, Connecticut.
Audit No. IRS 93-43 was performed of ABB/AMDATA during the period from October 1,1992, to March 26,1993, and Audit No. IRS 93-55 was performed of General Electric NDE/ ANSI certification procedures and personnel records on April 5,1993.
Each ISI vendor was determined to be acceptable, with certain documented restrictions, to j
perform examinations at Pilgrim.
Licensee quality assurance activities conducted during the 1993 refueling outage include surveillances of ISI vendor NDE in progress. Eight surveillances of ultrasonic and magnetic particle examinations performed by ABB/AMDATA and two surveillances ofliquid penetrant j
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examinations performed by General Electric were pe.rformed by licensee QC engineers. The
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surveillance reports were selected for inspection to ascertain that appropriate examination method attributes were selected by the QC engineers, and that the results were clearly documented.
The attributes selected by the engineers were evidence of their familiarity with the related NDE methods and further, provided an appropriate means for assessing the acceptability of NDE performed by the licensee's vendors.
Conclusions Inservice inspection NDE activities were conducted in compliance with ASME Code,Section XI, requirements by qualified examiners. Daily communication between licensee and ISI
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vendor staff members was evident. Records verified Boston Edison Company involvement in its vendors' ISI activities as evidenced by the QA audits and surveillances performed of the
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vendors by the licensee's staff.
The examiners, who performed NDE at Pilgrim, were p.operly qualified and certified in accordance with the provisions of SNT-TC-1 A, and the personnel who were responsible for performing ultrasonic examinations for the detection of IGSCC received the special training and qualification specified by NUREG-0313, Revision 2, and Generic letter 88-01.
5.0 EXIT MEETING The inspector met with licensee representatives denoted in Attachment 1 at the conclusion of
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the inspection on April 16, 1993. The scope and findings of the inspection were summarized. The licensee did not take issue with the findings and results of the inspection.
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ATTACIIMENT 1 PERSONS CONTACTED Boston Edison Comnany
- G. Basilesio, Senior Compliance Engineer
- J. Bellefeville, Deputy Plant Department Manager
- F. Famulari, Quality Assurance Department Manager
- C. Garrow, Senior Quality Control Engineer - I2 vel III
- J. Keyes, Acting Compliance Division Manager
- E. Kraft, Jr., Vice President - Nuclear Operations
- H Oheim, Manager, Regulatory Affairs
- B. Perkins, Senior Quality Control Engineer - Level III
- W. Rothert, General Manager - Technical
- L. Schmeling, Plant Manager U.S. Nuclear Regulatory Commission
- J. Macdonald, Senior Resident Inspector
- Indicates those attending the exit meeting on April 16, 1993.
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