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modular helium cycle

Modular Helium Reactor - an overview ScienceDirect Topics

The modular helium reactor (MHR) has been suggested as the Gen IV reference concept for nuclear hydrogen generation on the basis of either the SI thermochemical cycle or HTSE. As part of the national hydrogen research program, the USDOE created the Nuclear Hydrogen Initiative (NHI) with the objective being to advance nuclear energy for the support of a future hydrogen economy. Between 2003 and ...

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The gas-turbine modular helium reactor - ResearchGate

The power conversion system (PCS) in the proposed small modular combined cycle nuclear gas turbine plant is based on the coupling of a non-intercooled topping helium Brayton direct closed-cycle ...

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Online course and simulator for engineering thermodynamics

To illustrate the usefulness of this type of cycle, let us start again from the example of PBMR helium cycle presented above, and build for this case a dual pressure combined cycle (120 and 10 bar, with HP and LP superheating at 500 and 300 °C). The synopsis of this optimized cycle, given in Figure below, shows that the efficiency rises from 48 to 52.5%.

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0554 - F201S - Fuel Cycle Processes - Appendix A - Gas and ...

the fuel annulus. Helium flows through the pebble bed and removes the heat generated by the nuclear reaction from the core. This helium is the same gas that is used as the working fluid in the power conversion unit, hence the PBMR's direct gas cycle. The PBMR power conversion unit is based on the thermodynamic Brayton (gas turbine) cycle

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A thermodynamic comparison between organic Rankine

01/01/2015  A comparative thermodynamic analysis and optimization is presented for waste heat recovery from the Gas Turbine-Modular Helium Reactor (GT-MHR) employing organic Rankine cycle (ORC) and Kalina cycle (KC). Thermodynamic models are developed for the stand alone GT-MHR and the two proposed combined cycles and the effects on the performances of the cycles are investigated

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Gas turbine modular helium reactor - Wikipedia

The Gas Turbine Modular Helium Reactor utilizes the Brayton cycle turbine arrangement, which gives it an efficiency of up to 48% – higher than any other reactor, as of 1995. Commercial light water reactors (LWRs) generally use the Rankine cycle, which is what coal-fired power plants use. Commercial LWRs average 32% efficiency, again as of 1995.

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Sustainability Free Full-Text A Comparative ...

A schematic diagram of the turbine-modular helium reactor/simple organic Rankine cycle (GT-MHR/SORC) is shown in Figure 1a. In this system, which has a capacity of 297.7 MW, the helium is first heated in the reactor and then expanded in the turbine to generate electrical power. Then, the helium flows through the recuperator, the evaporator and the precooler. The compressed helium from the low ...

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The Gas Turbine-Modular Helium Reactor for the Next

The Gas Turbine-Modular Helium Reactor (GT-MHR) is the result of coupling the evolution of a low power density passively safe modular reactor with key technology developments in the U.S. during the last decade: large industrial gas turbines; large active magnetic bearings; and compact, highly effective plate-fin heat exchangers. This is accomplished through the unique use of the Brayton cycle ...

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Design of a Nuclear Power Plant with Gas Turbine Modular ...

that with modular helium cooled reactors using spherical fuel elements; it i s possible to increase the efficiency of the r eactor cycle with a safer nuclear process control. In addition, it is also

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Preliminary studies of compact Brayton cycle performance ...

01/01/2015  We are exploring the power conversion system for the very small modular type HTGR. • Helium Brayton cycle for 20 MWth SM-HTGR was studied to evaluate the cycle features. • The comparison between S-CO 2 Brayton cycle and helium Brayton cycle was performed. • Cycle analysis was conducted while considering various turbomachinery efficiencies. Abstract. A High Temperature

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Exergoeconomic evaluation and optimization of a novel ...

25/10/2016  A novel gas turbine-modular helium reactor/new Kalina cycle is proposed. • Exergoeconomic analysis is performed for the combined cycle. • The product unit cost is reduced by 11.3% by waste heat utilization. • Augmented Kalina cycle performs better than Kalina cycle 34 economically. • Exergy efficiency of gas turbine-modular helium ...

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Power conversion system considerations for a high ...

05/12/2014  The power conversion system (PCS) in the proposed small modular combined cycle nuclear gas turbine plant is based on the coupling of a non-intercooled topping helium Brayton direct closed-cycle gas turbine and a single-reheat supercritical steam Rankine bottoming cycle. The nuclear heat source (with a thermal rating of 350 MWt) is a helium cooled and graphite moderated very high

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Nuclear Hydrogen Thermochemical Production of Hydrogen ...

• The Modular Helium Reactor coupled to the Sulfur-Iodine water-splitting cycle is an attractive system: – High efficiency, reasonable cost, passive safety • Estimated costs of ~$1.40/kg could compete with H2 from natural gas today if O2 can be sold – Increasing cost of natural gas or CO2 costs will give nuclear increasing cost advantage Nuclear production of hydrogen can be the ...

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A Comparative Exergoeconomic Analysis of Waste Heat ...

Keywords: gas turbine-modular helium reactor; organic Rankine cycle; exergy; exergoeconomics; SPECO; waste heat utilization 1. Introduction The world faces numerous sustainability challenges. Energy is necessary for economic and social development and increasing the quality of life. Much of the world’s energy is currently produced and consumed in ways that cannot be sustained. Although ...

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Online course and simulator for engineering

To illustrate the usefulness of this type of cycle, let us start again from the example of PBMR helium cycle presented above, and build for this case a dual pressure combined cycle (120 and 10 bar, with HP and LP superheating at 500 and 300 °C). The synopsis of this optimized cycle, given in Figure below, shows that the efficiency rises from 48 to 52.5%.

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Modular Helium Reactors for a Nuclear Renaissance

The gas turbine modular helium reactor has the ability to destroy 90% of weapons grade plutonium-239 and 65% of the total plutonium in a single reactor cycle. During this process, electricity is still generated at efficiencies of nearly 50%. The single cycle efficiency is important as it reduces proliferation risks during the shuffling of core material. Recycling reactors, in contrast to ...

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USE OF THE MODULAR HELIUM REACTOR FOR HYDROGEN PRODUCTION

USE OF THE MODULAR HELIUM REACTOR FOR HYDROGEN PRODUCTION K.R. Schultz The S-I cycle does require high temperatures, but offers the prospects for high efficiency conversion of heat energy to hydrogen energy as shown on Fig. 3. Selection of Nuclear Reactor Sandia National Laboratories evaluated various nuclear reactors for their ability to provide the high temperature heat

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The Gas Turbine - Modular Helium Reactor: A Promising ...

The Gas Turbine Modular Helium Reactor (GT-MHR) combines features that lead to high thermal efficiencies, cycle simplicity, enhanced safety, and improved economics. It uses a high thermal capacity nuclear core that operates at high temperatures, and a Brayton energy conversion cycle. The high temperature helium from the reactor directly drives a gas turbine and electric generator, which is a ...

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The Gas Turbine – Modular Helium Reactor: A Promising ...

modular helium reactor (MHR), contained in one vessel, with a high efficiency Brayton cycle gas turbine (GT) energy conversion system contained in an adjacent vessel. The reactor and power conversion vessels are interconnected with a short cross-vessel and are located in a below grade concrete silo. Figure 1. GT-MHR Module. GA-A23952 2 April 2002 Key design characteristics of the gas-cooled ...

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Advanced In-Core Fuel Cycles for the Gas Turbine-Modular ...

The gas turbine-modular helium reactor coupled to the deep burn in-core fuel management strategy offers the extraordinary capability to incinerate over 50% of the initial inventory of fissile material. This extraordinary feature, coming from an advanced and well tested fuel element design, which takes advantage of the TRISO particles technology, is maintained while the reactor is loaded with ...

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0554 - F201S - Fuel Cycle Processes - Appendix A - Gas and ...

the fuel annulus. Helium flows through the pebble bed and removes the heat generated by the nuclear reaction from the core. This helium is the same gas that is used as the working fluid in the power conversion unit, hence the PBMR's direct gas cycle. The PBMR power conversion unit is based on the thermodynamic Brayton (gas turbine) cycle

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DESIGN OF INDIRECT GAS TURBINE CYCLE FOR XA9642781 A ...

DESIGN OF INDIRECT GAS TURBINE CYCLE FOR XA9642781 A MODULAR HIGH TEMPERATURE GAS COOLED REACTOR Z. ZHANG, Z. JIANG Institute of Nuclear Energy Technology, Tsinghua University, Beijing, China Abstract This paper describes a design of the indirect gas turbine cycle for the 200MWt pebble bed MHTGR. In the design, the helium out of the Intermediate Heat eXchanger (MX)

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Online course and simulator for engineering

To illustrate the usefulness of this type of cycle, let us start again from the example of PBMR helium cycle presented above, and build for this case a dual pressure combined cycle (120 and 10 bar, with HP and LP superheating at 500 and 300 °C). The synopsis of this optimized cycle, given in Figure below, shows that the efficiency rises from 48 to 52.5%.

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Gas-cooled reactor - Wikipedia

Gas Turbine Modular Helium Reactor (General Atomics design) Steam Cycle High-Temperature Gas-Cooled Reactor (Areva SMR design) Pebble bed reactor. AVR reactor (1966-1988) THTR-300 (1983-1989) HTR-10 (2003-today) HTR-PM (under construction) Pebble bed modular reactor (design) Gas-cooled fast reactor (No moderator, He cooled) Energy Multiplier Module (General Atomics design)

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SAFETY AND SECURITY FOR SMALL MODULAR NUCLEAR

A GFR is a high-temperature helium-cooled fast-spectrum reactor with a closed fuel cycle [2]. This reactor technology combines the advantages of fast-spectrum systems for long-term sustainability of uranium resources and waste minimisation, with those of high-temperature systems. The high outlet temperature of the helium

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