IR 05000255/1980007
| ML18045A260 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 05/08/1980 |
| From: | Danielson D, Ward K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML18045A258 | List: |
| References | |
| 50-255-80-07, 50-255-80-7, NUDOCS 8006190675 | |
| Download: ML18045A260 (3) | |
Text
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION III
Report No. 50-255/80-07 Docket No. 50-255 Licensee:
Consumers Power Company 212 W. Michigan Avenue Jackson, Michigan 49201 Facility Name:
Palisades Nuclear Generating Plant Investigation At:
Palisades Site, Covert, Michigan Investigation Conducted:
April 23, 1980
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Investigator~. D. Ward
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Approved By:
D. H. Danielson, Chief Engineering Support Section 2 Investigation Summary License No. DPR-20 Investigation on April 23, 1980 (Report No. 50-255/80-07)
Areas Investigated:
Allegations concerning poor weld quality of rod hangers on the containment spray ring and also of the support restraints #H896 and
- H89 The investigation involved a total of 5 investigation hours on site by one NRC investigato Results:
No items of noncompliance or deviations were identifie !/
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DETAILS Persons Contacted Consumers Power Company (CPCO)
K. Osborne, Senior Engineer Bechtel Corporation (Bechtel)
P. Smith, Mechanical Group Supervisor R. Yonekawa, Quality Control Engineer The inspector also contacted and interviewed other licensee and contractor personne All above were present at the exit intervie.
Receipt of Allegations Allegations On April 22, 1980, a welder (subcontractor) provided to RIII personnel allegations concerning poor weld quality of rod hangers on the con-tainment spray ring header; such as nuts that are tack welded on the end of rod hangers having undercut as much as 50 percen Also, han-gers H896 and H897 that are welded to an H beam had been slug welded (rod laid in corner of fillet and welded over).
The welder had ob-served the above two months prior to making the allegations on April 22, 198.
Findings Approximately 75 hangers were visually examined on the containment spray ring header and two were found to have undercut - #926.2, 9/16" x 3/32" and 910.3, 1/8" x 1/16".
Bechtel field inspection reports were made (No. 315 and No. 316) and were sent to the Bechtel Ann Arbor office for evaluatio The evaluation disclosed that hanger 910.3 was the worst of the tw The safety factor was 25.6 for "as is" condition operating basis earthquakes and 42.5 for shutdown earthquak In general, at the worst condition the hanger could hold 25.6 times more than require An NRC IE Bulletin 79-14 titled "Seismic Analyses for As-Built Safety Related Piping Systems" was sent to the licensee on August 15, 197 The licensee started working on the IE Bulletin 79-14 in August 1979, and the Bulletin may be completed May, 198 As a result of the Bul-letin, several piping supports have been found to have defects and
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- need modifications, etc. because of design and workmanshi Hangers H896 and H897 were added to the modification list on March 17, 198 New drawings were issued on March 24, 1980, and the hangers were modi-fied April 22, 198 On April 23, 1980 the investigator went up to the top of the containment inside and visually examined the modifica-tion of hangers H896 and H89 He also. went up and visually examined welds on support H921 in the top center of the containmen All welds thpt the investigator examined were found to be acceptabl The licen-see has pictures, reports, etc documenting the visual examinatio No items of noncompliance or deviations were identifie Exit Interview The investigator met with site representatives at the conclusion of the investigation and summarized the scope and findings of the investigatio