[en] This paper describes dynamic experiments for 3 pulsed reactors. 1st reactor was pulsed from some average power by rotating a partial Be reflector past an unreflected core face; the other 2 reactors were pulsed by rapid insertion of a fuel rod into the unmoderated and unreflected reactor at essentially zero neutron level with no significant neutron source present. The first reactor was a mockup of an EURATOM design (never constructed) of the proposed SORA Reactor, and the other two were the Health Physics Research Reactor and the Army Pulse Radiation Facility Reactor (APRFR). This paper describes the experiments performed in initial testing of these systems, including destructive tests of APRFR, to set operating limits for this type of reactor in pulsed operation. All the experiments described were performed at the Oak Ridge Critical Experiments Facility

[en] The Juliet experiment is currently in preliminary design (IER-128). This experiment will utilize a suite of diagnostics to measure the physical state of the device (temperature, surface motion, stress, etc.) and the total and time rate of change of neutron and gamma fluxes. A variety of potential diagnostics has been proposed in this CED-1 report. Based on schedule and funding, a subset of diagnostics will be selected for testing using the Godiva IV pulsed reactor as a source of neutrons and gammas. The diagnostics development and testing will occur over a two year period (FY12-13) culminating in a final set of diagnostics to be fielded for he Juliet experiment currently proposed for execution in FY15.

[en] It is shown how it is possible to obtain, by using the block effect of neutron absorption, periodically pulsed neutrons in a stationary research reactor. The experimental results obtained in determining the thermal neutron flux distribution in the core and the reflector of a critical assembly with a reactivity modulator are presented. (author)

[en] Sandia National Laboratories has designed, constructed and operated bare metal Godiva-type and pool-type pulse reactors since 1961. The reactor facilities were designed to support a wide spectrum of research, development, and testing activities associated with weapon and reactor systems

No abstract available

[en] An overview of nuclear-pumped laser programs conducted on various pulsed reactor types has been presented. The independent research undertaken in Russia and the United States have confirmed the concept of energy conversion from nuclear exothermal reactions to coherent optical radiation as feasible. (Author)

[en] A method for the determination of start condition of a two-sectional nuclear reactor is described. The method consists in the measurement of fission rates in the reactor power rising and simplify the reactor control. Fission rates in several fixed positions of reactivity control unit (RCU) of the section, which does not contain neutron booster, and in variable positions of RCU of the section containing neutron booster are measured additionally. Simultaneously with the measurements the period of the reactor power rising is measured

[en] This patent describes a thermal radiator system for use on an outer space vehicle, which must survive a long period of nonuse and then radiate large amounts of heat for a limited period of time. The radiator includes groups of radiator panels that are pivotally connected in tandem, so that they can be moved to deployed configuration wherein the panels lie largely coplanar, and to a stowed configuration wherein the panels lie in a stack to resist micrometeorite damage. The panels are mounted on a boom which separates a hot power source from a payload. While the panels are stowed, warm fluid passes through their arteries to keep them warm enough to maintain the coolant in a liquid state and avoid embrittlement of material

[en] Ratios between the amplitude of reversal oscillations of external reactivity in a pulsed reactor and power pulse energy oscillations with provision for temperature power reactivity effect are derived. The conclusion on the amplification of power oscillations for negative feed back is drawn. It is shown that at an verage power continuous power oscillations an arise also in the absence of external reactivity oscillations. The pulsed reactor can be in an equilibrium oritical state not only at a constant value of power pulse energy but also at variable energy values

No abstract available