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Title: Application of Gamma code coupled with turbomachinery models for high temperature gas-cooled reactors

The very high-temperature gas-cooled reactor (VHTR) is envisioned as a single- or dual-purpose reactor for electricity and hydrogen generation. The concept has average coolant temperatures above 9000C and operational fuel temperatures above 12500C. The concept provides the potential for increased energy conversion efficiency and for high-temperature process heat application in addition to power generation. While all the High Temperature Gas Cooled Reactor (HTGR) concepts have sufficiently high temperature to support process heat applications, such as coal gasification, desalination or cogenerative processes, the VHTR’s higher temperatures allow broader applications, including thermochemical hydrogen production. However, the very high temperatures of this reactor concept can be detrimental to safety if a loss-ofcoolant accident (LOCA) occurs. Following the loss of coolant through the break and coolant depressurization, air will enter the core through the break by molecular diffusion and ultimately by natural convection, leading to oxidation of the in-core graphite structure and fuel. The oxidation will accelerate heatup of the reactor core and the release of a toxic gas, CO, and fission products. Thus, without any effective countermeasures, a pipe break may lead to significant fuel damage and fission product release. Prior to the start of this Korean/United States collaboration, no computer codes weremore » available that had been sufficiently developed and validated to reliably simulate a LOCA in the VHTR. Therefore, we have worked for the past three years on developing and validating advanced computational methods for simulating LOCAs in a VHTR. GAMMA code is being developed to implement turbomachinery models in the power conversion unit (PCU) and ultimately models associated with the hydrogen plant. Some preliminary results will be described in this paper.« less
Authors:
Publication Date:
OSTI Identifier:
927621
Report Number(s):
INL/CON-07-13222
TRN: US0804798
DOE Contract Number:
DE-AC07-99ID-13727
Resource Type:
Conference
Resource Relation:
Conference: ISROMAC-12,Honolulu, Hawaii,02/17/2008,02/22/2008
Research Org:
Idaho National Laboratory (INL)
Sponsoring Org:
DOE - NE
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COAL GASIFICATION; COMPUTER CODES; COOLANTS; DEPRESSURIZATION; DESALINATION; DIFFUSION; EFFICIENCY; ELECTRICITY; ENERGY CONVERSION; FISSION PRODUCT RELEASE; FISSION PRODUCTS; GAS COOLED REACTORS; GRAPHITE; HYDROGEN; HYDROGEN PRODUCTION; LOSS OF COOLANT; NATURAL CONVECTION; OXIDATION; POWER GENERATION; PROCESS HEAT; REACTOR CORES; SAFETY; TURBOMACHINERY turbomachinery model, HTGR