This article summarizes the most relevant binary and ternary systems phase diagrams involved in a severe accident in a nuclear reactor. Due to uncontrolled temperature rise inside the reactor, the core degradation may be set off leading to the full or partial melting of the materials inside the ...
In this technique, Core damage was assigned to be the top event. Successively, the top event was categorized into all likely events groups that could trigger it to happen. Systems of safety and further actions for successful operational mitigations were not included. The very basic level of eve...
This method minimizes the changes in the local power release accompanying a change in the running values of the reactor power and the axial offset, characterizing the unevenness of the power distribution over the core height. The results of computational validation of the method are presented. The...
In the frame of the Generation IV Sodium Fast Reactor (SFR) safety studies, a core catcher with a sacrificial material could be placed at the bottom of the nuclear reactor. Its role is to dilute the (U, Pu)O_2 molten fuel in case of a hypothetical core meltdown accident. A Al_2O_...
During the normal cycle of a pressurized water reactor, boron concentration is reduced in the core until fuel burns up. A stretch out of the normal cycle is however possible afterwards, provided primary coolant temperature is reduced. In those stretch out periods, nuclear operators want to keep ...
daily load fluctuations/ A2843D Core control and guidance in fission reactors A2850G Light water reactors C3340F Control of nuclear systemsMethodology applicable to the synthesis of no-carrier-added [O-methyl-C-11]alfentanil was developed. The sequence consisted of [C-11]methylation and propionyl...
Excessive looping through multicore cables is not used, thus avoiding the consequent large voltage drops in the wiring which would prevent trip relay operation. Trip circuit supervision is provided on all turbine and circuit-breaker trip coils because of the possibility of open-circuits on these coi...
In the frame of the Generation IV Sodium Fast Reactor (SFR) safety studies, a core catcher with a sacrificial material could be placed at the bottom of the nuclear reactor. Its role is to dilute the (U, Pu)O2 molten fuel in case of a hypothetical core meltdown accident. A Al2O3–...
The analysis of Hypothetical Core Disruptive Accidents in Sodium Fast Reactors (SFR) is a general component for the safety assessment of the modern SFRs. Since a fast reactor is not in its most reactive configuration, material redistribution during core disruption may lead to severe nuclear power ...
Therefore, we have been developing a safety system to stabilize the core melt and avoid molten core concrete interaction by installing a refractory layer between the reactor vessel and the concrete. In order to estimate the effect of the refractory layer, it is necessary to consider the reaction...