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NRC moves forward with sunset of aircraft impact assessment rule
The Nuclear Regulatory Commission has sunset its aircraft impact assessment rule for 2027, as NRC staff have addressed several of the public comments considered “significant and adverse” that prompted the agency this past winter to temporarily delay the sunsetting move.
The final rule, which was published in the Federal Register on Wednesday, addressed some of the more contentious concerns raised by the public. It sets a conditional sunset date of April 8, 2027, “unless the NRC determines that the cessation deadline should be extended to a date not more than 5 years in the future after offering the public an opportunity to provide input on the costs and benefits of this section and considering that input.”
A. G. Grindell, W. F. Boudreau, H. W. Savage
Nuclear Science and Engineering | Volume 7 | Number 1 | January 1960 | Pages 83-91
Technical Paper | doi.org/10.13182/NSE60-A25701
Articles are hosted by Taylor and Francis Online.
Sump-type centrifugal pumps ranging in capacity from 2–1500 gpm have been developed in the Reactor Projects Division, Oak Ridge National Laboratory, for circulating liquid metals and molten salts at temperatures up to 1500°F in metallurgical, heat transfer, and reactor experiments. Each of these pumps uses a nearly conventional bearing assembly to support a vertical shaft and an impeller suspended in a tank containing the high-temperature liquid and an inert blanketing gas. Drive motors and lubrication equipment are external to the pump proper. Seven different models of the sump-type pump have been manufactured and about 400,000 hr of operation has been accumulated in the temperature range 1100–1500°F. Problems resolved in the development of these pumps are discussed. Limitations on the use of this type of pump for reactor and nonreactor applications are noted.
