IR 05000289/1972002
| ML19260A163 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/17/1972 |
| From: | Folsom S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19260A161 | List: |
| References | |
| 50-289-72-02, 50-289-72-2, NUDOCS 7910290772 | |
| Download: ML19260A163 (2) | |
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P C0 INQUIRY REPORT No. 50-289/72-02
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Licensee: Metropoliten Edisnn onmpany Facility: Three Mile Island Unit 1 License No.:
CPPR-66 i
Title: Control Rod Drive Housings - Tubing Undersi=ed Prepared By:
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S. A. Folsom,'Kenctor Inspector (Constr-etion)
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Date and Manner AEC was Informed:
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The information was received by S. A. Folsom, RO:I, on May 11, 1972 from the applicant's QA manager in the course of a tele-
phone conversation on another matter.
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Description of Particular Event or Circumstance Babcock & Wilcox, the NSSS supplier for Three Mile Island 1 and 2, notified the applicant that a problem had been encountered in the control rod drive housings which B&W had furnished to another (unspecified) nuclear facility, and it was believed that this
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condition might be present in the 70 housings already shipped to Thr:a Mil; Ialuud 1.
The problem centered on " hot tearing" of ine metal during forming
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operations on the 3.5" stainless steel tubes. The defects had been found only on the stainless steel tubing fabricated by Sandvik Corporation, which was used on 53 of the housings.
U. S. Steel supplied the tubes for the other 17 housings.
Royd1 Industries and via=ond Power Company manufactured the housings, each using tubing from both manufacturers.
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B&W has requested that the 53 housings which contain Sandvik tubing be returned to Diamond Pouer Company, Lancaster, Ohio. There the
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tubes will be 100% UT inspected and defective tubing replaced.
36W has tentatively proposed an acceptance criterion of 95% of the speci-fled wall thickness.
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Action hv T.icensee The applicant had already rejected a number of the 70 housings due to unsatisfactory weldind.
Since the B&W notification of defective Labing in the ousings, the applicant has dye-checked some of the tubing and has identified unacceptable linear' indica-tions. B&W has been notified that all 70 housings must be re-turned to Diamond Power for examination, and also that modified acceptance criteria would be unacceptable. The applicant has agreed to comply with the reporting requirements of 10 CFR 50.55(e).
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