ML19319D408
| ML19319D408 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/26/1977 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8003170541 | |
| Download: ML19319D408 (1) | |
Text
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e-OCT 2,Q 29{7, Distributions IE IE ROI 301
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i HDK M DUM PCR N. C. Hosaley, Director, RCI FRCH:
K. V. Seyfrit, A/D, TP, ROI, II b
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SUBJECT:
PUMP SHAFI KEWAYs A. shaf t in an ECCS pump at Crystal River.3 failed after a relatively Examination of the shaft indicated that the short period of operation.
failure may have been due to the sharp notch formed by the intersection of the side and bottom planes of tha keyway. Good practica dictatas that stress concentraticas be controlled at such intersections by designing a fillet into the kayvsy.
On page 233 of the raference, the stress concentration factor for ksyvays is plotted as a function of the ratio of the fillet radius to tha shaf t dic=tsr. As ths ratio approaches saro, tha stress cen en*
t:2tica factor increases rapidly. When the ratio is less than 0.005, the concentration facter is not accurately kncun, thus the stress
~
cannot be accurately calculated.
'*evarthatsas, based cs ysars of trcub1: frre operatien with =any pe:ps, Worthington Corporcticn, tha =anuf:cturer of the Crystal River-3 pt::p, dcca not design fillets ints their shaf t keyvsys. While this practica
- sy be 3:ceptahis for most industries, ve do not beliers that it is acesptable for the nuclear industry.
We believe that other old-line pu:sp manufactursrs csy folicw the sees practica and that some inspectica in this crea is varranted.
t Reference A5ME Handbook, "Natale Engineering-Ibstgn," Second Edition, McCraw-Hill, j
1965.
Onain.Lg any l
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K. 7. Seyfrit, Xssistant Directar Technical Programs, ROI, IC I
f7)'d O ecs G. W. Rainauth, RCI W. R. Rutherford, RCI I
R. W. Woodruff (2), 301
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