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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.”
R. M. Pearce, D. H. Walker
Nuclear Science and Engineering | Volume 2 | Number 1 | February 1957 | Pages 24-32
doi.org/10.13182/NSE57-A15569
Articles are hosted by Taylor and Francis Online.
The uranium metal temperature coefficient of reactivity has been measured in ZEEP. A uranium sample was oscillated in the reactor and the resulting modulation of reactor power was measured as a function of the sample temperature. The temperature coefficient of uniformly heated uranium rods, 3.25 cm. in diameter, immersed in a constant temperature moderator (moderator-to-uranium volume ratio 22) is deduced from this experiment. Over the range +30°C to +230°C the coefficient is dk/dT = − (1.25 ± O.09) × 10−5 per °C. Over the range +10°C to −140°C the coefficient is dk/df = −(1.58 ± 0.18) × 10−5 per °C.
