ML20066E492
| ML20066E492 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 11/09/1982 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Kintner L Office of Nuclear Reactor Regulation |
| References | |
| EF2-60-351, NUDOCS 8211150225 | |
| Download: ML20066E492 (2) | |
Text
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Harry Tauber Group Vice President Edison BBE="
November 9, 1982 EF2 - 60,351 Mr. L. L. Kintner U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Washington, D. C. 20555
Dear Mr. Kintner:
Reference:
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341
Subject:
Piping Vibration Acceptance Criteria This is in response to your telecopy dated October 27, 1982.
Staff Position In Section 3 9 1.1.5 of the FSAR, the acceptance cri-teria for stress caused by steady state vibration is given for Level 2 criteria. Level 2 criteria is pro-vided to evaluate the adequacy of long term system operation.
It is stated that for Class 1 bystems, the acceptance criteria will be the endurance limit for the piping, and for non-Class 1 systems, the acceptance criteria will be the limits of Equation 9 of NC-3650 of ASME Section 3 The Staff finds the Level 2 cri-teria to be unacceptable.
The Staff's position is that the stress associated withsteadystatevibrationbelimitedgo50%ofthe ifh0) l alternating stress intensity, Sa, of 10 cycles defined in ASME Code Appendix I, Figure I-9 1 and I-9 2.
We consider this item to be open and will require that the applicant provide assurance that the Staff position has been satisfied.
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8211150225 821109 PDR ADOCK 05000341 A
Mr. L. L. Kintner November 9, 1982 EF2 - 60,351 Page 2
Response
Per our discussion with your Staff on October 29, 1982 and November 1, 1982, the following is our agreed upon position.
The acceptance criteria for steady state vibration for both Class 1 and non-Class 1 piping is 7,690 psi for carbon steel and 12,000 psi for stainless steel.
The aboveallowablestressamplitudeiseqgalto80%of the alternating stress intensity at 10 cycles for carbon steel and equal to 60% of the alternating stress intensity at 106 cycles for stainless steel.
The values of alternating stress intensity are taken from Figure I-9 1 of Appendix I of ASME Code Section III.
In addition, a factor of safety of 1 3 was applied to obtain the allowables.
FSAR Section 3 9 1.1 5 will be revised to incorporate the above acceptance criteria.
Should you have any further questions, please contact Mr. L. E. Schuerman, (313) 649-7562.
Sincerely, cc:
Mr. B. Little l
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