For more than a year, ECN is engaged in a research programme on transmutation of actinides as well as of fission products by means of respectively fission and neutron capture. It is intended to contribute to international efforts, which evaluate recycling options of the nuclear waste problem. Besides studies on strategy and scenarios, efforts are made to demonstrate possibilities for transmutat...

Stable power processes are never guaranteed. An assortment of unstable behaviors wrecks power apparatus, including mechanical vibration, malfunctioning control apparatus, unstable fluid flow, unstable boiling of liquids, or combinations thereof. A necessary condition for stable reactor power is that the reactor distortion accompanying a temperature rise decreases the reactivity, thus slowing an...

In Korea, an accelerator-driven system (ADS) called HYPER (Hybrid Power Extraction Reactor) is being studied for the transmutation of the radioactive wastes. HYPER is a 1 000 MWth leadbismuth eutectic (LBE)-cooled ADS. In this paper, the neutronic design characteristics of HYPER are described and its transmutation performances are assessed for an equilibrium cycle. The core is loaded with a duc...

So far 22 criticality accidents have been reported (McLaughlin et al., 2000) including JCO accident in Japan. All cases took place with fuel solution or slurry except one case of metal fuel. It was not clear that what was actually happening during those criticality accidents except the JCO accident, for which a fission power profile was reproduced from a gammaray monitoring data (Tonoike et al....

Thorium Molten Salt Reactor-500 (TMSR-500), one of the Generation IV nuclear reactors, is designed by Thorcon International, Pte. Ltd, which projected to be built in Indonesia. The reactor core radially surrounded B4C shielding, but not upper part. As silo hall sits above and accessible personnel, dose rate must calculated area ensure workers receive an annual below acceptable limit. from neutr...

The International Atomic Energy Agency (IAEA) requires that all test and research reactors operating on Higher Enriched Uranium (HEU) should be converted to Low (LEU) for safety security purposes. Nigeria having a Miniature Neutron Source Reactor (MNSR) has been long interested in fuel technological not just develop the area but also meet with resolution nuclear treaty set out by global regulat...

The work completed had the following objectives: i) To compute pulse width (full width at half maximum-FWHM) of the power curves for the Three Mile Island Unit 1 Pressurized Water Reactor (TMI-1 PWR) core model in the event of a super-prompt-critical rod ejection accident (REA) at Hot Zero Power (HZP) in the central fuel assembly (Rod 7A) at both EOC and BOC for various control rod worths and d...

Matrix exponential methods have long been utilized for isotopic depletion in nuclear fuel calculations. In this paper we discuss the development of such addition to species transport liquid fueled molten salt reactors (MSRs). Conventional work with fixed assemblies which fission products and fissile material do not throughout core. Liquid a much different way, allowing primary reactor loop. Bec...

The 250 kW TRIGA Mark II research reactor, Vienna, operates since 7 March 1962. The initial criticality was achieved with the first core loading of 57 fuel elements (FE) of same type (Aluminium clad fuel with 20% enrichment). Later on due to fuel consumption SST clad 20% enriched FE (s) have been added to compensate the reactor core burn-up. In 1975 high enriched (HEU) TRIGA fuel (FLIP fuel = F...

Until recently, reactor transient problems were exclusively solved by approximate deterministic methods. The increase in available computing power made it feasible to approach the analyses with time-dependent Monte Carlo These methods offer first-principle solution space-time evolution of explicitly tracking prompt neutrons, precursors delayed neutrons and time space. Nevertheless, a very signi...