ML18045A227
| ML18045A227 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/09/1980 |
| From: | Huston R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8006120384 | |
| Download: ML18045A227 (1) | |
Text
General Office,; 212 West Michigan Avenue, Jackson, Michigan 4920_1 * (517) 788-0650 June 9, 1980 Director,_ Nuclear Reactor R~gulation Att Mr Dennis M Crutchfield, Chief Operating Projects Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - ISI EQUIPMENT FREQUENCY RESPONSE Article IV-2000, Paragraph IV 2100 (b) and (c) of the 1977 ASHE Section XI Code requires the outputs from eddy current test (ET) equipment to have a minimum 'frequency response of d-c to 100 -Hz +/- 2% of full scale.
The instrumentation us~d for thi~ testing does not meet this requirement; however, it does meet the requirements. of ASME Section V, Article 8, Appendix 1, Paragraph 121 (b) which requires a d-c to 100 Hz frequency response of +/- 15%.
The reasons why our equipment does not meet the tighter restrictions of Section XI are twofold:
- 1.
There is a trade-off between frequency.response and signal-to-noise ratio.
Designing instrum~ntation to com~ly with the +/- 2% specification degrades test sensitivity.
- 2. *Routine ET examinations. have been and are being performed successfully without the +/- 2% requirement.
Based on the above discussion and the discrepancies between Article IV-2000 of the 1977 ASME Section XI Code and Article 8, Appendix 1 of the ASHE Section V Code, we are requesting you to approve the minimum frequency response of d-c to 100 Hz +/- 5% for this ET instrumentation.
Senior Licensing Engineer
/Joo/