ML20212M790
| ML20212M790 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 08/19/1986 |
| From: | Musolf D NORTHERN STATES POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8608270165 | |
| Download: ML20212M790 (2) | |
Text
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0-Northern States Power Company 414 Nicollet Mall Minneapohs, Minnesota 55401 Telephone (612) 330-5500 August 19, 1986 Director Office of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PIANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Microfilming of Radiographs Northern States Power in cooperation with a local microfilming company has developed what we believe to be a suitable method for reproducing radiographic images from microfilm.
The purpose of this letter is to request NRC review and concurrence with the use of this methodology in a program for the microfilming of radiographs. A check is attached in the amount of $150.00 in accordance with the requirements of 10 CFR Part 170.
The 1980 ASME Code Section XI,1981 Winter Addenda, addresses the microfilming of radiographs in paragraph IWA-6340 " Reproduction arid Microfilming".
It states:
Radiographs may be microfilmed; however the Owner's Quality Assurance Program shall include a system of monitoring the accuracy of the reproduction process so that when the microfilm is projected to the original size it will provide the same information retrieval capability as the original radiograph.
The accuracy of the reproduction process includes the exposure (or multiple exposures for censity coverage), focusing, contrast and resolution.
The Quality Assurance Program shall also provide a system for identifying film artifacts that might appear as material discontinuities in the reproduction.
The methodology that we have developed involves a multiple exposure technique utilizing five microfilm images for each radiographic image.
This allows for a density range of approximately 1.5 to 4.0.
By using the multiple exposure technique we feel that at least one of che images would be close to the actual density of the original radiograph and would provide a sensitivity level equivalent to the radiograph.
It would be our intention to microfilm only those radiographs that can be microfilmed using standard procedures. For example, the microfilming of valve casting radiographs is probably not achievable, due to the drastic jdd 1)/A/Mh BA pe/
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Director NRR NhhM August 19, 1986 page 2 variance in densities, and would not be pursued. The original radiographic film would be retainea for a period of at least two years following microfilming. The resulting microfilms would be reviewed against the original radiographs to assure that the microfilms meet all the ASME Code requirements. Where microfilm does not meet ASME Code requirements, the original radiograph would be retained for the life of the plant.
If you have any questions related to our proposal, or need further information on the proposed microfilming techniques, please contact us.
D M N ws David Musolf Manager - Nuclear Support rvices DMM/EFE/efe c:
Regional Administrator-III, NRC NRR Project Manager, NRC Resident Inspector, NRC G Charnoff t