ML13316B753
| ML13316B753 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/30/1980 |
| From: | Ottoson H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-80-08, IEB-80-8, NUDOCS 8008080179 | |
| Download: ML13316B753 (5) | |
Text
Southern California Edison Company P.O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 June 30, 1980 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1990 North California Boulevard Suite 202, Walnut Creek Plaza Walnut Creek, California 94596 Attention: Mr. R. H. Engelken, Director DOCKET NO. 50-206 SAN ONOFRE UNIT 1
Dear Sir:
I. E.Bulletin 80-08, Examination of Containment Liner Butt Welds Reference is made to your correspondence of April 7, 1980, forwarding the subject IE Bulletin. Identified therein were potential deficiencies of certain non-destructive examinations performed on containment penetration welds.
Responses to individual items are listed below in the order given in the Bulletin.
Item 1:
"Determine if your facility contains the flued head design for penetration connections, or other designs with containment boundary butt weld(s) between the penetration sleeve and process piping as illustrated in Figure NE 1120-1, Winter.1975 Addenda to the 1974 and later editions of the ASME B&PV Code."
Response
The containment boundary penetrations at San Onofre Unit 1 do not employ the flued head design for connections between the penetration sleeve and process piping.
A number of the penetration types employed do contain containment boundary butt welds, however, and have been reviewed in reference to the subject Bulletin.
U. S. Nuclear Regulatory Commission I.E.Bulletin 80-08 Page 2 Item 2: "If an affirmative answer is reached for Item 1, determine the following:
- a. Applicability of the ASME Code including year and addenda and/or Regulatory Guide 1.19,
- b. Type of non-destructive examinations performed during construction,
- c. Type of weld joint (including pipe material and size) and whether or not backing bars were used,
- d. Results of construction non-destructive examinations, i.e. if repairs were required,.this should be identified including extent of repairs and description of defects encountered during repair, if known."
Response
- a.
San Onofre Unit 1 penetration welding was performed subject to the requirements of the ASME Boiler and Pressure Vessel Code,Section III, Subsection B, 1965 edition.
Regulatory Guide 1.19 was not issued until December, 1971 and therefore is not applicable to the subject penetration welds.
- b. A listing of the types of non-destructive examinations required during construction is provided in the attached table.
- c. The subject welds are all single vee butt welds. A listing of the pipe material, size and whether or not backing bars were used is provided in the attached table.
- d.
Southern California Edison Company, in conjunction with the construction contractor, Bechtel Power Corporation, performed an extensive records search but were unable to locate documentation of the results of the subject radiographic examinations.
According to the ASME B&PV Code,Section III, 1965, records of radiographs were required to be kept on file by the manufacturer for a period of five years. As a result of our inability to retrieve these records, it is assumed that they are no longer on file.
U. S. Nuclear Regulatory Commission I.E.Bulletin 80-08 Page 3 Item 3:
"For those facilities committed during construction to perform volumetric examination of such penetrations through SAR commitments which have not performed radiography, justify not performing radio graphy or submit plans and schedules for performing radiographic examinations."
Response
All welds within the scope of this Bulletin were required to be fully radiographed during construction.
Item 4:
"Within 90 days of the date of this Bulletin, facilities with an operating license or a construction permit shall submit the information requested in Items 1, 2 and 3 of this Bulletin."
Response
This letter constitutes our response to this item.
Should you have any questions regarding this matter, please call me.
Sincerely, H. L. Ottoson Manager of Nuclear Operations cc:
Director, Office of Inspection and Enforcement, Division of Reactor Operations Inspection
CONTAINMENT BOUNDARY BUTT WELD
SUMMARY
IE BULLETIN 80-08 OUTER WALL TYPES OF NON PENETRATION DIAMETER THICKNESS DESTRUCTIVE BACKING NUMBER MATERIAL (inches)
(inches)
EXAMINATIONS BARS A-1A,B,C,D A-53-G 8.625 0.322 RT,VT,HT Yes A-9A,B A-2A,B A-53-B 3.500 0.600 RT,VT,HT Yes A-3A,B A-4,A,B,C,D,E,F A-8 A-333-GR.0 to A-312-TP-304 3.500 0.216 RT,HT,PNT Yes A-14 A-53-B 4.500 0.337 RT,VT,HT Yes B-1A,B,C A-333-GR.0 to B-11 A-312-TP-304 12.750 0.500 RT,VT,HT,PNT Yes B-2 A-333-GT.0 to A-312-TP-304 6.625 0.432 RT,HT,PNT No B-6 A-333-GR.0 to B-7A,B,C A-312-TP-304 6.625 0.432 RI,HT,PNT Yes B-10 B-17A B-8 A-333-GR.0 to A-312-TP-304 8.625 0.500 RT,VT,HTPNT Yes B-12 A-333-GR.0 to A-312-TP-304B 14.000 0.593 RT,HT,PNT,MT Yes B-18A A-333-GR.0 to B-18B A-312-TP-304 8.625 0.500 RT,HT,PNT Yes C-2C
Containment Boundary Butt Weld Summary IE Bulletin 80-08 Page 2 OUTER WALL TYPES OF NON PENETRATICN DIAMETER THICKNESS DESTRUCTIVE BACKING NUMBER MATERIAL (inches)
(inches)
EXAMINATIONS BARS B-17B A-333-GR.0 to A-312-TP-304 6.625 0.134 RT,HT OR PNT Yes D-1 A-333-GR.0 48.000 0.500 RT,VT,MT Yes E-1 A-350-LFI 24.000 0.500 RT,VT,PNT No LEGEND:
Types of Non-Destructive Examinations RT Radiographic Examination VT Visual Inspection with Dye-Penetrant Examinations at Discretion of Inspector HT Hydrostatic Test PNT -
Pneumatic Tests PT Liquid Penetrant Examination MT Magnetic Particle Examination