Abstract
Reactor reactivity does not only depend on reactor diameter but also radius and enrichment of fuel ball (kernel) to operate reactor optimally. This research analyses effectiveness of kernel radius and enrichment to achieve critical reactor condition. The HTR in this research adopts HTR-10 China and HTR of pebble bed. The calculations are performed by using MCNPX code in each kernel radii of 320-350 µm and enrichments of 5-10% Uranium. Kernel is composed of Uranium Dioxide coated by four outer layers: Carbon, IpyC (Inner Pyrolytic Coating), SiC (Silicon Carbides) and OpyC (Outer Pyrolytic Coating). It is called TRISO and it is distributed in pebble-bed ball using Simple Cubic Lattice whereas pebble-bed and moderator balls are distributed in the core zone using a Body Centred Cubic (BCC) lattice by ratio of 57:43. The research results are obtained that the reactor will be effective to achieve critical condition in kernel radius of 325-330 µm at 9% Uranium enrichment and will be in supercritical condition if the reactor uses more than 330 µm of kernel radius and 9% enrichment of Uranium but the reactor will be subcritical if Uranium enrichment is 5-8%.
Highlights
Many scientist attentions of reactor technology and nuclear energy in the world against the High Temperature Reactor (HTR) has increased in the past decade
Materials used in this research were HTR10, HTR pebble-bed database and continuous energy nuclear data library ENDF/B-VII
In the calculation of HTR pebble-bed using MCNPX, pebble-bed core model was approximated by utilizing a body-centred cubic (BCC) lattice and TRISO was distributed in pebble-bed ball by Simple Cubic lattice
Summary
Many scientist attentions of reactor technology and nuclear energy in the world against the High Temperature Reactor (HTR) has increased in the past decade. The HTR utilizes graphite as the moderator at the same reflector and the fuel is a spherical particle (pebble-bed) with UO2 composition as a neutron generator. This reactor uses helium as cooler of reactor. Due to the cooler has better hot transfer characteristic, the reactor has higher energy efficiency on. HTR has other advantages like producing hot steam which can use to process Enhanced Oil Recovery, produce hydrogen and make liquid fuel form coal. HTR can save fossil fuel due to it can reduce CO2 emission rate and pollution at atmosphere (Masdin, 2001) and one of the main factors that attract many people to study and develop HTR because it has capabilities to produce energy economically and inherent safety characteristics (Holbrook, 2008)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
