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2025 annual assessments out for U.S. reactors
The Nuclear Regulatory Commission has released its 2025 annual performance assessments of the country’s 95 operating commercial nuclear reactors. And of the 95 reactors, all but five earned the highest marks.
Nuclear power plant assessments can fall under one of five categories: Licensee Response, Regulatory Response, Degraded Cornerstone, Degraded Performance, and Unacceptable Performance. Ninety reactors fell under Licensee Response, the highest performance category in safety and security. Plants that achieve this level of performance are subject to a Reactor Oversight Process (ROP) baseline inspection.
Evan T. Williams, Charles D. Coryell
Nuclear Technology | Volume 2 | Number 3 | June 1966 | Pages 256-258
Technical Paper and Note | doi.org/10.13182/NT66-A27598
Articles are hosted by Taylor and Francis Online.
Two experiments have shown that 87Br is the major contributor to the 55-sec delayed-neutron activity in 235U thermal-neutron fission products. An upper limit of 0.5% has been set on the possible contribution to the total 55-sec delayed-neutron activity by unknown precursors with half-life of the order of 55-sec or longer. The half-life of87Br has been accurately measured by observing the neutron decay in chemically pure bromine samples and was found to be 55.4 ± 0.7 sec.
