ML19210E916
| ML19210E916 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/10/1979 |
| From: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19210E917 | List: |
| References | |
| MCAR-29, NUDOCS 7912130219 | |
| Download: ML19210E916 (2) | |
Text
.
Consumers 1-(C P0rl8f U
gg Stephen H. Howell r
I Senior Vice l>rsident General Of fices: 19415 West Parnall Road, Jackson, Michigan 49201 e (517) 7884453 December 10, 1979 Hove-310-79 Mr J G Keppler, Regional Director Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR PLANT UNIT N0 1, DOCKET No 50-329 UNIT NO 2, DOCKET NO 50-330 IMPACT TESTED - ITT GRINNELL SUPPLIED MAIN FEED PIPE
Reference:
S H Howell letters to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket No 50-329; Unit No 2, Docket No 50-330; Impact Tested - ITT Grinnell Supplier Main Feed Pipe;
- 1) Serial Hove-175-79, dated June 20, 1979
- 2) Serial Hove-215-79, dated August 1, 1979
- 3) Serial Hove-2h2-79, dated September 7,1979 h) Serial Hove-275-79, dated October 26, 1979 The referenced letters were interim 50.55(e) reports on the Main Feed Pipe Spools which had questionable impact test results.
This letter is the final report.
The Midland Plant is now in conformance in that the pipe spools supplied, or being supplied, for the main feed lines meet the physical impact requirements for the material in accordance with ASME Section III, Class 2, Code Criteria. There is one heat which did not meet the Codg requirements for impact properties at a minimum service temperature of 30 F.
There is another heat which had a questionable basis for code compliance based on a subsequent heat treatment used to improve impact properties of GA-106 materials. These heats have been shown to meet or exceed the code require-ments for a minimum service temperature of 70 F, which is the revised specified temperature for the spools associated with these heats.
For Heat N-32762, there was a single spool which went through a hot bend process and for which impact property tests were taken (at 30 F) after all heat treatment processes were completed. These impact property test 1550 116 pj g s
I/t I
7912100
2 Hove-310-79 results were not acceptable.
It has been shown that the low test results were not related to the hot-bend process. This spool piece has been scrapped at the. vendor and a replacement spool vill be provided.
The attachment provides a more complete su= mary of the actions taken to resolve the reported condition.
WRB/lr
Attachment:
MCAR-29, Final Report, Dated November 19, 1979 CC: Director of Office of Inspection & Enforcement Att: Mr Victor Stello, USNRC (15)
Director, Office of Management Information and Program Control, USURC (1) a 1550 117 Dw whw
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