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[en] Information is tabulated on nuclear reactor and critical assembly facilities in operation, shut down, under construction or planned. The data include name, owner, location, type, power, and startup date

[en] Information is tabulated on nuclear reactor and critical assembly facilities in operation, shut down, under construction, or planned. The data include name, owner, location, type, power, and significant dates

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[en] It reports the initial critical experiment, zero power physical experiments and the experimental results on YBW Critical Assembly after technical modification. The experiments show that the modified systems and devices of YBW Critical Assembly can perform their own functions, the protection system and reactivity control system satisfy the requirements, the reactor can operate safely, and the Assembly can be used for the reactor physical experiment researches. (authors)

[en] The published methods for the deduction of reactivity from pulsed neutron experiments on subcritical reactors are reviewed. Each method is categorized as inherently yielding a result that is either spatially independent or spatially dependent. The spatially independent results are formally identical with the static reactivity; the result does not depend, in principle, on the location of either the pulsed neutron source or the neutron detector during data collection. The spatially dependent results only approximate the static reactivity; the results are affected, in varying degrees, by the locations of the source and detector. Among the techniques yielding spatially independent results are the Space-Time method of Parks and Stewart and the Inhour method of Preskitt et al. Spatially dependent results are obtained with the Sjoestrand, Gozani, and Garelis-Russell methods which are examined with and without the kinetic distortion corrections given by Becker and Quisenberry. Intercomparisons of all methods are made with reference to pulsed neutron experiments on both unreflected and reflected reactors. Recommendations are made concerning the best choice of method under the various experimental conditions that are likely to be encountered. 14 references. (U.S.)