Achievement of Reactor-Outlet Coolant Temperature of 950.DEG.C. in HTTR

Abstract

A High Temperature Gas-cooled Reactor (HTGR) is particularly attractive due to its capability of producing hightemperature helium gas and to its inherent safety characteristics. The High Temperature Engineering Test Reactor (HTTR), which is the first HTGR in Japan, achieved its rated thermal power of 30 MW and reactor-outlet coolant temperature of 950 C on 19 April 2004. During the high-temperature test operation which is the final phase of the rise-topower tests, reactor characteristics and reactor performance were confirmed, and reactor operations were monitored to demonstrate the safety and stability of operation. The reactor-outlet coolant temperature of 950 C makes it possible to extend high-temperature gas-cooled reactor use beyond the field of electric power. Also, highly effective power generation with a high-temperature gas turbine becomes possible, as does hydrogen production from water. The achievement of 950 C will be a major contribution to the actualization of producing hydrogen from water using the high-temperature gas-cooled reactors. This report describes the results of the high-temperature test operation of the HTTR.

Hydrogen Utilization for Carbon Recycling Iron Making System

“…Industrial high-temperature waste heat is also able to be energy source for heat supply into endothermic reaction of CO2 reduction. High temperature gas cooled type nuclear reactor (HTGR) which has demonstrated heat output at 950°C 4) is a candidate of the primary energy source. Because iACRES is able to accept various non-carbon energy resources as electricity, heat and hydrogen for ironmaking system and have robustness to carbon supply security, then, it would be categorized in smart ironmaking system.…”

Carbon Recycling for Reduction of Carbon Dioxide Emission from Iron-making Process

“…(6) and (13)) is a practical process for CO regeneration. The enthalpy balance of ACRES for CO is shown in Fig.…”

“…A high-temperature gas reactor type nuclear reactor (HTGR) is the most suitable energy source for ACRES because of the high-temperature output of up to 950°C with non-carbon emission and a sufficient amount of nuclear fuel to meet a country's demand. 6) High-temperature electrolysis of CO 2 using both heat and electricity outputs from HTGR is expected to have high efficiency than high-temperature electrolysis of water. The application of ACRES based on CO regenerated by high-temperature electrolysis driven by HTGR is proposed in Fig.…”

Effects of ion beam mixing of silicon carbide film deposited onto metallic materials for application to nuclear hydrogen production

“…SiC coating is known to improve the lifetime or the performance of metallic substrates when exposed to aggressive environments [4]. The high resistance of SiC to the corrosion could be due to the very strong covalent bonding between silicon and carbon and its tetrahedral coordination [5]. Since the adhesion between the coated layer and the substrate is most crucial in this application, development of ion beam mixing (IBM) [6][7][8][9] technique to produce a highly adherent coated layer was attempted.…”