We have been studying -decay properties of nuclei far from the -stability line with the use of the 2nd generation of the gross theory and semi-gross theory. In the 2nd generation of the gross theory, the shell effects of nuclei are included only through the -decay Q-values. On the other hand, in the case of the semi-gross theory, other various shell effects of the parent nucleus are taken into ...

We present the status of the Angra Neutrino project, describing the development of an antineutrino detector aimed to monitor nuclear reactor activity. The experiment will take place at the Brazilian nuclear power plant located in Angra dos Reis. The Angra II reactor, with 4GW of thermal power, will be used as a source of antineutrinos. We expect to observe about one thousand events per day with...

We have observed fallout from the recent Fukushima Dai-ichi reactor accident in samples of rainwater collected in the San Francisco Bay area. Gamma ray spectra measured from these samples show clear evidence of fission products--(131,132)I, (132)Te, and (134,137)Cs. The activity levels we have measured for these isotopes are very low and pose no health risk to the public.

Utilization of nuclear research reactors is high importance for education and training, development, many other applications. However, less effective utilization encountered in mainly due to limitations power levels related experimental facilities. Such limitations, however, have led different global owners consider upgrading the their accommodate increase demands. To without replacing major co...

The neutron eccmomy of a fast reactor is not so significantly affected by neutron capture in the structural materials in the core as is that of a thermal reactor. First, most neutron-capture cross sections increase with de­ creasing neutron energy, and the neutron population of the liquid-metal fast breeder reactor (Lhl FI~R) contains a far lower percentage of thermal neutrons than does that (I...

This document presents the process for a new method developed characterization of delayed gamma-ray radiation fields in pulse reactors like Annular Core Research Reactor (ACRR). The environments used to test this ACRR Central Cavity were various standard irradiation configurations that amounts moderators and shielding. All environment same fission product source energy spectrum. required use si...

} The mechanistic smeared cracking model was extended from two to three dimensions (page 2). } Subcontinuum molecular dynamics simulations were used to investigate oxide fuel grain boundary fractures during reactor transients (page 2). } An improved model of bubble and grain boundary interaction was developed (page 2). } Improved descriptions of fission-gas/grain boundary interactions and clust...

This paper deals with the development of a batch-reactor model with a theoretical and a locally affine fuzzy model. The batch reactor is used in the pharmaceutical industry for the production of drugs, where a rapid and precise temperature control is necessary. The model has to be built to include all the main features necessary for the purposes of modelling. The development of the model for th...

In nuclear fission, a delayed neutron is a neutron emitted by one of the fission products any time from a few milliseconds to a few minutes after the fission event. The counts of delayed neutrons constitute a time series sequence. The analysis of such time series can prove to be very significant for purpose of predictive maintenance in nuclear power plants. In this paper we aim to identify anom...