IR 05000206/1986013
| ML13323B149 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/04/1986 |
| From: | Harris R, Kerch H, Wiggins J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML13323B148 | List: |
| References | |
| 50-206-86-13, NUDOCS 8606200113 | |
| Download: ML13323B149 (10) | |
Text
U.S. NUCLEAR REGULATORY COMMISSION
REGION I
Report N /86-13 Docket N License N DPR-13 Category B
Licensee:
Southern California Edison 2244 Walnut Grove Avenue.,
Rosemead, CA 91770 Facility Name: San Onofre Unit 1 Inspection At: San Clemente, California Inspection Conducted: March 24 -
28, 1986 (In office) and April 1 -
10, 1986 (Onsite)
Inspectors:
HW Ker, Lear eacto Engineer d
Irard H. Xarris/ngr. rch. NDE at/
Approved by:
fe gginst, Chidf, materials Yrdcesses
/dae Section, DRS/ Region I Inspection Summary:
Inspection Conducted March 24 through April 10, 1986 (Report-N /86-13)
Areas Inspected: A special, announced inspection utilizing the NRC Mobile NDE Van to perform nondestructive examination of selected safety related piping, components and structures. Two Region-I based inspection personnel assisted by two contracted NDE personnel were utilized during this inspection. The purpose of this inspection was to ascertain the condition of plant material through various NDE techniques. Areas examined were the Main Steam and Feedwater system piping and support Results:
No.violations or deviations were identifie S62AOC1 060604 0 D DC 35OPD
DETAILS 1. Persons Contacted Southern California Edison C. A. Couser, Compliance D. B. Schone, QA Manager D. E. Nunn, NGS M. P. Short, SQI Manager R. N. Santosuosso, Maintenance H. E. Morgan, Station Manager B. Katz, Mgr. O&MS W. M. Lazear, QA Supervisor J. A. Mundis, O&MS R. Retana, QSE D. Henry, O&MS R. J. Scott, Consultant M. A. Wharton, DSM J. L. Winter, Engineer H. E. Morgan, SM S. B. Allman, Manager J. Madigan, HP R. L. Erickson, Senior Engineer M. K. Sullivan, ISEG 0. E. Saio, Building Superintendent D. C. Stoneopher, QA Manager Bechtel H. F. McCluskey, Project Manager S. R. Schuyler, Project Superintendent R. M. Reinsch, Project QA M. J. Dutra, NDE Level III NRC Region V R. C. Tang D. V. Gallagher R. White P. Johnson A. De Angelo
2.0 Purpose of the Inspection The purpose of this inspection was to perform independent measurements to ascertain and evaluate main steam system and the conditions of A and C lines of the feedwater system at San Onofre 1. These systems were non destructively examined using various techniques to detect inservice indications which may have been generated by the water hammer event of November 21, 1985. A selected sample of welds and materials was taken from the main steam and feedwater piping for re-examination by the NR During the period of March 24 - 28, 1986 Nondestructive examination pro cedures were reviewed in the Region I office for completeness and compliance to the licensee's FSAR commitments and to applicable codes, standards and specification Subsequently, an onsite independent veri fication inspection was conducted during the weeks of April 1 through April 10, 1986 using the NRC Mobile Nondestructive Examination (NDE)
laboratory. This inspection was conducted by Region I based personnel in conjunction with NRC contracted NDE personne.1 Nondestructive Examinations 2. Review of Site Radiographs The inspector noted that the licensee had radiographed a sample of welds during 198 Nine of these welds were reviewed by the NRC during this inspectio Because the construction code in effect at the time of construction was ASME I, 1962, there were no nondestruc tive examination requirements for the particular pipe weld thickness and diameters involved in the licensee's sample. the sample included the following welds:
1-24-3 7-24-4 6-24-4 7-24-4 1-24-1 7-24-5 4-20-5 2-24-1 3-20-5 These same radiographs were also reviewed by Livermore National Laboratory (LNL) personnel during this inspection period and several radiographic film technical problems were identified during this review. These problems will be reported separately by LN Results:
No inservice discontinuities were foun. Radiographic Examination Seventeen (17) pipe weldments were radiographed using an Iridium 192 source. The technique and procedure used were in accordance with NRC procedure, NDE-5, Rev. 0. The resulting radiographs were evaluated per applicable code requirements. Those weldments listed in Attachment 1 were radiographed to assess material conditio Results:
Five welds which were not among the licensee's 1980 sample were radiographed by the NRC. The NRC inspector identified to licensee personnel at the site, the types of findings determined from the NRC radiographic film. Due to the fact that the licensee did not radiograph these welds, the NRC provided a copy of each weld radio graph that requires further evaluation. Specifically, NRC finding included:
Weld N Indication Radiographic Requiring Evaluation Film Area MSS-1-13 Porosity 15-30 MSS-2-13 Slag and Porosity 0-15 and 16-30 MSS-2-2 Porosity 30-44 and 44-66 MSS-2-10 Slag 30-45 FWS-2 Linear Indication
These items are considered unresolved pending the licensee's evaluation and NRC review. (Unresolved item 50-206/86-13-01).
2. Thickness Measurements (Material Erosion)
Thickness measurements were taken to detect indication of material erosion on two (2) six foot sections of the feedwater system piping using a Nova D-100 digital thickness gage. Ninety measurements were taken with a low reading of.465 in. and a high of.506 in. The material examined was ASTM A-106 sch. 160 pip See Attachment I for complete listing of material checked. Minimum allowable wall thickness was determined by use of ASTM standard pipe size and nominal thickness char In addition to the above thickness measurements, four elbow fittings, one tee section and two valve bodies were measured for thickness. It was determined that on the these items, no area was found to be less than the adjacent pipe materia Listed below, by component, are high and low readings of thickness for the pipe fittings and valves examined by NR Component/Fitting High/Low Weld Pipe Weld ID/Pipe Tee/PBP-214 1.920/1.420 1.140/.977 1-11/Line 1 MSS El./MSS-2 1.058/.988 1.034/.973 2-13/Line 2 El./MSS-1 1.079/1.014
.966/.913 1-13/Line 1 El./FWS-391
.535/.466
.624/.536 391/4/Line 391 El./FWS-391
.512/.464
.661/.505 391-6/Line 391 Valve-MSS-302 2.583/2.474 1.078/1.014 2-9/2 Valve-MSS-301 3.085/2.935 1.088/,942 2-10/2
Results: No violations were identifie. Thickness Measurements (Weldments)
Sixteen (16) pipe weldments and adjacent base materials were examined for wall thickness using a NOVA-D 100 digital thickness gag Exami nations were performed using NRC procedure NDE-11, Rev. 0 and site procedure NDEP-UT-001, Rev. 3. Minimum allowable wall thickness for piping material was determined by use of ASTM standard pipe size and nominal thickness char Results: No violations were identifie. Visual Examination Twenty-three (23) pipe weldments were visually examined for weld reinforcement, surface condition and overall workmanship per NRC procedure NDE-10, Rev. 0 and site procedure NDEP-VT-001, Rev. Results: No violations were identifie. Magnetic Particle Examination:
Six (6) 24" pipe weldments on the Main Steam System and five (5) 10" pipe weldments were examined per NRC procedure NDE-6, Rev. 0. In addition to the above examination, two (2) pipe penetration seal welds and two (2) six foot sections of pipe material on the feedwater system were examined by the magnetic particle metho Results:
Two (2) areas adjacent to weldments 2-11 and 2-3 on the main steam line were found to have linear indications that retained magnetic particles. These indications appeared to result from the pipe fabrication process and were not service induced. The licensee was informed of the indications and subsequently these areas were investigated by the licensee and removed by grinding. The inspector had no further concerns with these item No violations were identifie. Ultrasonic Examination Two (2) 24" pipe weldments were ultrasonically examined per NRC procedure NDE-1, Rev. 0 and licensee's procedure NDEP-UT-001, Rev. The examination performed during this inspection was a manual contact ultrasonic scan in the shear mode, using a 450 angle beam search uni The ultrasonic equipment used was a Sonic Mark I flaw detec tor, calibrated in accordance with NRC procedure NDE-1, Rev. 0. A Distance Amplitude Correction (DAC) Curve was established using the licensee's calibration block (S/N SCE-009) for 24" sch 60 pipin All instrument settings were as near as practical to those used during the original examination performed by licensee site personne *
Results:
No recordable indications were observed during this examinatio No violations were identifie. Hanger Examination Site hanger drawings were requested by' the inspector on several occasions. A licensee representative informed the inspector that it would require several days to provide these hanger drawings and these drawings may not have the weld details required for this inspection. The NRC then inspected the hangers without the aid of the drawing Nine pipe hangers in the main steam and feedwater lines were visually examined for any movement, cracking around the concrete area, loose or broken members and general conditions of welded areas. General workmanship quality was reviewe See Attachment I for hangers inspecte Results:
No violations were ideitifie.2 Review of Procedures The following procedures were reviewed for compliance with NRC and code requirement. Southern California' Edison Procedure Title NDEP-UT-001,.Rev. 3 Ultrasonic Examination for piping welds/base metal NDEP-UT-002, Rev. 2 Ultrasonic Examinations for determining EmbedAnchor bolt length NDEP-UT-003, Rev. 1 Ultrasonic Examinations wall thickness measurement of plate, pipe forgings and castings NDEP-UT-004, Rev. 0 Ultrasonic wall thickness measurement using the USL-38 Ultrasonic Instrument
- II
NDEP-MT-001, Rev. 4 Magnetic Particle Examination NDEP-PT-001, Rev. 1 Liquid Penetrant Examination NDEP-PT-002, Rev. 0 Liquid Penetrant Exam. -
Fluorescent Method NDEP-PT-003, Rev. 0 Liquid Penetrant Examination NDEP-VT-001, Rev. 2 Visual Examination Procedures VT-2, ASME Section XI NDEP-VT-002, Rev. 1 Visual Examination Procedure, VT-1, VT-3, VT-4 NDEP-VT-003, Rev. 0 Examination of Air Tanks 2. Mobile Inspection Service, Inc. Procedures MISI-RT-1, Rev. 1 Radiographic Examination 2. Bechtel Power Corp. Procedures MT (DRY) ASME/ANSI Rev. 0, Magnetic Particle Examination PT (SR) ASME/ANSI, Rev. 0, Liquid Penetrant Examination RT-XG-2, Rev. 2, Radiographic Examination Results:
Procedure RT-XG-2, did not contain any reference of year and addendum of the code used as a basis for acceptance criteri This was dicussed with the licensee representative and he agreed to the required changes. This item is considered unresolved pending procedure changes and NRC review. Unresolved item 50-206/86-13-02 3. Attachments Attachment No. 1 is a tabulation of specific items examined and the results achieve. Unresolved Items An unresolved item is a matter for which more information is necessary to determine whether the item is acceptable, a violation or deviatio Unresolved items are contained in paragraphs 2.1.2 and 2.. Exit Interview The inspector met with the licensee's representatives (denoted in paragraph 1) at the conclusion of the inspectio The inspector summarized the scope and findings of this inspection. No written materials were given to the licensee during this inspectio )MENTi1 DATE:
10 April1, 1986 Page 1 of 3 INDEPENDENT MEASURW*
PROGRAM SITE:
San Onofre Unit 1 WELD N ALLOY 1 [ I P. HARDNESS I VISUAL REMARKS Line/ISO I ANA JFERRITE[THIC< J_____
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AT '0 ENT 1 DATE:
Apil, 1986 Page 2 of 3 INDEPENDENT MEASURW PROGRAM WELD N I ALLOY P. HARDNESS I VISUAL I
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10 ApriI, 1986 Page 3 of 3 INDEPENDENT MEASUREMENT PROGRAM SITE: San Onofre Unit 1 WELD N lEALLOY T l P. HARDNESS I VISUAL I
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- Denotes thickness measurement taken on material other than pipe weldment areas.