ML19320C665
| ML19320C665 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 07/03/1980 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-80-08, IEB-80-8, NUDOCS 8007170526 | |
| Download: ML19320C665 (3) | |
Text
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Yl6 WISCONSIN Electnc m comu 231 W. MICHICAN. P.0, 80X 2046. MILWAUKEE, WI 53201 July 3, 1980 Mr. James G. Keppler, Regional Director Office of Inspection and Enforcement, Region III U. S. NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
DOCKET NOS. 50-266 AND 50-301 EXAMINATION OF CONTAINMENT PENETRATION WELDS IE BULLETIN 80-08 POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 This is to provide our letter response to IE Bulletin 80-08 dated April 7, 1980.
The response as numbered below corresponds to the questions in the Bulletin.
1.
Our records indicate that both Units 1 and 2 have containment boundary butt welds between the penetration sleeve and process piping.
Both flued heads and drilled standard weight pipe caps are used for the closure piece between the sleeves and the pipes.
The specification for design, f abricatic.n,
2.
a.
inspection, and testi,ng of the containmtint penetration head fittings referenced ash 0 Boiler and Pressure Vessel Code, Sectiol III, Class B, 1968 Edition and all adde ada to and including Summer 1968 Addenda.
Regulatory Guide 1.19 is not applicable, b.
Inspection procedures used for the cloiure welds consisted of liquid penetrant inspection on all butt weld joins.
In addition, radiographic inspection was performed on some of the welds.
Loca leak pressure testing at the containment design accident pressure was also performed on all welds. 8007170 62 6
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Mr. James G. Keppler July 3, 1980 Open butt weld joints without backing rings were c.
specified in the welding procedures for penetra-tion closures installed prior to about June 1970.
All of these welds were radiographed.
In June 1970, the welding procedures were changed to specify backing rings, and the requirement for radiographs was deleted.
Consequently, most of the Unit 1 penetration closure welds were radio-graph inspected, and the majority of the Unit 2 closure welds were not since they were completed after June 1970.
The material for the flued heads and the caps are in accordance with the list below:
Flued Heads Carbon Steel - ASTM A-350-LF 1 Stainless Steel - ASTM A182, Grade F304 or F316 Internal Caps Carbon Steel - ASTM A420, WPL 1 Stainless Steel - ASTM A403, Type 304 In addition to the above specifications, material for the carbon steel flued heads and internal caps were Charpy V-notch tested, and conform to the requirements of Pgh N1211(a) of ASME Section III-at a test temperature of -45'F.
The penetration housing sizes installed are 8",
10", 12", 14", 16"c and 18", except for the feedwater and main steam penetrations which have conical housings.
d.
The records of the liquid penetrant construction examinations performed on the flued head and the pipe cap welds to the penetration housing consist of signatures on the weld check-off lists after acceptance, so there is no record of defects repaired.
The radiography records show the number of reshoots, but do not explain the extent of repairs or the description of defects.
Of the penetrations radio-graphed, 41 were accepted on the initial radiography, 12 required one repair, 2 required two repairs, 2 required three repairs, and 1 required four repairs.
Five penetrations that were radiographed and repaired were inspected and qualified with liquid penetrant examination, subsequent to the deletion of the requirement for radiography.
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Mr. James G. Keppler July 3, 1980 Section 5.1.2.6 of the Point Beach FFDSAR references 3.
applicable sections of ASA N6.2-1965, " Safety Standard for the Design, Fabrication, and Maintenance of Steel Containment Structures for Stationary for containment penetrations, Nuclear Power Reactors",
and ASME Section III, Article 4, 1965, for design Radiography was not performed and of penetrations.
liquid penetrant examination used to examine these welds based on interpretation of paragraph N1350 of 1968 Edition.
The interpretation that ASME III, these welds qualified as " attachments" was made by Bechtel Power Corporation personnel, and was verified with Westinghouse Electric Corporation personnel and with Mr. B. F. Langer, Chairman of " Subcommittee on Nuclear Power", according to our records.
This completes the response to this Bulletin.
We point out that all containment penetration welds at Point Beach have either a leak chase channel for leak detection, or the penetration has a closure cap or expansion bellows welded on the outside of Both of these designs provide a double barrier the containment.
to leakage, and permit local leak pressure testing of the subject The periodic containment integrated leak rate test butt welds.
provides scheduled verification of the integrity of these welds.
If you have any questions on the information provided herein., do not hesitate to contact us.
Very truly yours, W
[(L' f
C. W. Fay, Mrector Nuclear Power Department Director Copies to: Division of Rea" tor Construction Inspection NRC Resident Inspector Point Beach Nuclear Plant
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