Researches on the fission product chemistry made after severe accident of Fukushima Daiichi Nuclear Power Station were reviewed with focus Cs in terms two regimes, namely, accidental source term and long-term via aqueous phase toward decommissioning. For term, chemical interaction Mo, B, Si under steam atmosphere greatly affect behavior release from fuel revaporization deposit structural materi...

The design phase and safety assessment of Generation IV liquid metal-cooled fast reactors calls for the improvement fuel pin performance codes, in particular enhancement their predictive capabilities towards uranium-plutonium mixed oxide fuels stainless-steel cladding under irradiation reactor environments. To this end, current codes must be critically assessed against experimental data from av...

To run a high conversion reactor with Pu-Th fuelled tight fuelled assembly, which has a long burn-up of a fuel, the reactor should be sited deep underground. By putting the reactor deep underground heat can be removed passively not only during a steady-state run and also in an emergency case of loss of coolant and loss of on-site power; hence the safety of the reactor can be much improved. Also...

Modular high-temperature gas-cooled reactor (MHTGR) has distinct advantages in the sense of the inherent safety, economy property, high electricity efficiency, potential usage for hydrogen production, and etc. Chinese design of MHTGR, named as High Temperature Gas-Cooled Reactor-Pebble bed Module (HTR-PM), based on the technology and experiences of the HTR-10, is under the standard design phase...

Xenon and caesium are among the most impacting fission products when studying nuclear fuel: xenon for its role on fuel rod thermomechanical behaviour during reactor operation in case of atmospheric radioactive release an accident a power plant. This paper focuses comparison thermal polycrystalline uranium dioxide (UO2) pellets. Caesium-133 or xenon-136 stable isotopes were introduced depleted U...

The Monte Carlo calculation of the effective (i.e. adjoint weighted) neutron generation time Keff, especially for continuous energy simulations, is not straightforward nor standard in Monte Carlo codes. The use of the non-adjoint weighted neutron generation time K (standard in most Monte Carlo codes) as an approximation of the effective one can lead to a serious bias. We show here that the diff...

In a Commission briefing on high-bumup fuel on March 25, 1997, the staff said that they would prepare a white paper on mixed-oxide (MOX) fuel in anticipation of a DOE program to bum excess weapons plutonium in commercial reactors. This memorandum and its attachment comprise that paper and are provided to inform the Commissioners of technical issues associated with such a program. More recently,...

the radiophotoluminescence property of some materials makes it possible to use them for dosimetry purposes. the silver activated metaphoshate glass 1 as an rpl dosimeter when exposed to x. or y radiations , forms fluorescent centers with long lived states ( metastate ). the silver ions (ag+) in unirradiated state produces vacancies when energy is supplied by irradiation the release of electrons...

The transmutation of transuranic (TRU) elements produced by pressurized water reactors (PWRs) can effectively reduce their radioactive hazards. molten chloride salt fast reactor (MCSFR) is a type liquid-fueled (MSR) using fuel in the form salts. MCSFR utilizing neutron spectrum and high actinide fraction considered to be potential for TRU transmutation. An online refueling reprocessing scenario...