ML19317E865
| ML19317E865 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/01/1972 |
| From: | Peltier I US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8001070663 | |
| Download: ML19317E865 (1) | |
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$1P 1 ~572 NOTE FOR FILES TELECON WITH KEN CANADY, DUKE POWER COMPANY, AUGUST 30, 1972 DESIGN STRESSES - OCONEE UNIT 1 INTERNALS K. Canady called to report that B&W had changed its internals design stress linit from 13,000 psi to 18,000 psi.
The 13,000 psi was an arbitrary 50% of the 26,000 psi limit for 10 6 fatigue cycles like10}ASME). (The ASME data do not go beyond 10 cycles but more cycles is necessary for 40 year plant life and for want of a better basis B&W decided to use the 50% valve.)
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Acting on the advise of 3. F. Langer (consultant to B&W) it was deemed to be conservative to extrapolate the ASME data at 4% per decade which would giv.e a value of 20,000 psi at 1012 cycles. B&W added additional conservatism and settled at 18,000 psi.
b,'
y I. A. Peltier, Project Manager Pressurized Water Reactors Branch No. 4 j
Directorate of, Licensing cc:
R. C. DeYoung A. Schwencer D. Lange I. A. Peltier
'T 8001070 h3
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