IR 05000285/1981031
| ML20040B846 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 12/03/1981 |
| From: | Randy Hall, Tomlinson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML20040B839 | List: |
| References | |
| 50-285-81-31, IEB-79-13, NUDOCS 8201260470 | |
| Download: ML20040B846 (3) | |
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APPENDIX U.S. NUCLEAR REGULATORY COMMISSION
REGION IV
Report:
50-285/81-31 Docket:
50-285 License:
DPR-40 Licensee:
Omaha Public Power District 1623 Harney Street Omaha, Nebraska 68102 Facility Name:
Fort Calhoun Station, Unit 1 Inspection at:
Fort Calhoun Station, Blair, Nebraska Inspection Conducted:
November 24-25, 1981 I
Inspector:
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D. P. TCTiilins6n, Reactor Inspector, Engineering and Date Materials Section Approved:
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R. E. Hall, Acting Chief, Engineering and Materials Da te'
Section Inspection Summary Inspection Conducted November 24-25, 1981 (Report 50-285/81-31)
Areas Inspected:
Announced, follow-up inspection of actions taken relative to IE Bulletin 79-13.
The inspection involved nine inspector-hours by one NRC inspector.
Results:
No violations or deviations were identified.
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DETAILS
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1.
Licensee Personnel Contacted j
- R. Hyde, Quality Assurance Engineer i
- C. Brunnert, Quality Assurance Inspector
- Denotes presence at the exit interview conducted Novmeber 25, 1981.
2.
Follow Up to IE Bulletin 79-13, " Cracking in Feedwater System Piping"
i The NRC inspector reviewed the radiographs of the Auxiliary Feedwater l
piping welds for both Steam Generators "A" and "B."
Three joints were radiographed on each steam generator by Omaha Nondestructive and
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Metallurgical Testing Company.
Joints ASR, ARE, BSR, and BRE were radio-
graphed with three exposures each, while joints ANS and BNS required four
exposures each for full coverage of the weld volume.
Double-loaded film holders were utilized to minimize the chance 'of film artifacts masking a defect.
As access to the I.D. of the pipe was impossible, it was necessary to use a film-side penetrameter on each of the joints.
Because
of the piping configurations and limited access to the welded joints, a technique was developed whereby a penetrameter was placed in the area
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of interest for one exposure on each joint.
These areas and the remainder of each weld were then radiographed with no penetrameter and the single exposure with the penetrameter was used as evidence that the radiographic sensitivity of the radiographs for each joint was adequate.
No densito-meter was available on site to verify the film densities, but the record
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package contained a statement signed by the Omaha Nondestructive and Metallurgical Testing Company Level III inspector attesting that the film i
densities were within the required range as checked with densitometer No. N2898 and film strip No. 13705.
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The NRC inspector reviewed the six technique radiographs to assure that penetrameter selection, image sensitivity and film identification were
l correct for each.
The 20 production radiographs were then reviewed to j
verify that full coverage was obtained, that each film was properly
identified, that apparent film densities were correct, and that proper evaluations were made.
No unacceptable indications were noted.
No violations or deviations were identified during this inspection.
Based upon the NRC review of tne radiographs required by IE Bulletin 79-13, this item is considered closed.
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O 3.
Exit Interview The NRC inspector met with the licensee representatives (denoted in paragraph 1) on November 25, 1981, to discuss the scope and findings of this inspection.
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