Pellet heat and mass transfer coefficients inside packed beds do not have definite deterministic values, but are stochastic quantities with a certain distribution. Here, a method is presented to incorporate the stochastic distribution of pellet properties in reactor design and operation models. The theory presented is illustrated with a number of examples. It is shown that pellet-scale statisti...

Geomagnetic field reversals and changes in intensity are understandable from an energy standpoint as natural consequences of intermittent and/or variable nuclear fission chain reactions deep within the Earth. Moreover, deep-Earth production of helium, having (3)He/(4)He ratios within the range observed from deep-mantle sources, is demonstrated to be a consequence of nuclear fission. Numerical s...

Neutronics analysis has been performed for LIBRA-LiTE. Using liquid lithium as a coolant and breeder results in more attractive neutronics performance features compared to Li17Pb83. The final focusing magnets and the front rows of the INPORT tubes have to be replaced every 1 and 3 years, respectively. The steel chamber wall, roof, and bottom plates are lifetime components. The overall reactor t...

Safe and reliable operation is still one of the major challenges in the development of the new generation of ITERlike fusion reactors. The deposited plasma energy during major disruptions, edge-localized modes (ELMs) and vertical displacement events (VDEs) causes significant surface erosion, possible structural failure and frequent plasma contamination. While plasma disruptions and ELM will hav...

A fast spectrum accelerator-driven system (ADS) may become a very versatile tool in the nuclear industry and allow a number of new applications. Such a system may serve as a means of transmuting large quantities of actinides and long lived fission products into short lived waste. Other possibilities, include the cross-progeny fuel cycle burning Pu in a thorium matrix and generating 233U which c...

Dynamic adsorption of radiocesium on titanium ferrocyanide grains from reactor coolant simulating solution containing salts at moderate concentrations has been investigated. Effective decontamination of the neutral solutions has been achieved, in the amounts of a more than 20 thousand bed volumes. After adsorption the titanium ferrocyanide was transferred to titanates and calcined at 900 °C. Th...

ROCOM is a four-loop test facility for the investigation of coolant mixing in the primary circuit of pressurized water reactors. Recently, a new sensor was developed for an improved visualisation and quantification of the coolant mixing in the downcomer. This new sensor spans a dense measuring grid and covers nearly the whole downcomer. In the presented work, special emphasis was given to the c...

Aluminum-coated plates, containing a uranium silicide (U3Si2) meat dispersed in an aluminum matrix, are commonly used the fuel elements of Material Testing Reactors (MTRs). These typically comprised narrow channels formed by parallel flat which allow coolant flow to remove heat fission reactions. It is important mention that thickness plates much smaller than their width and height. The high ra...