Coupling of Modular High Temperature Gas-Cooled Reactor with

Coupling of Modular High. Temperature Gas-Cooled Reactor with supercritical Rankin cycle Birin D. S. Master of 1 st year education, NNSTU, OKBM

Modular High-Temperature Gas. Cooled Reactor Inherent safety; Capability to achieve high core outlet temperature; Capability to produce highpotential thermal energy.

Modes to produce electricity Rankin steam cycle Brayton gas cycle

Types of supercritical Rankin steam cycle The standard oncereheat by primary loop SC Rankin cycle The life-steam reheat SC Rankin cycle

The first type of configuration MHTGR 250 with first type of SC Rankin cycle

The second type of configuration MHTGR 250 with first type of SC Rankin cycle

Configuration MHTGR-250 with second type of SC Rankin cycle

MHTGR SC plant

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The summary Coupling of Modular High-Temperature Gas-Cooled Reactor with Supercritical Rankin Cycle. The Modular High-Temperature Gas-Cooled Reactor is a type of Gen-4 reactor, based on High. Temperature Gas-Cooled reactor with metal vessel, seems like module. This type of reactor has many advantages: inherent safety, capability to achieve high core outlet temperature and produce high-potential thermal energy. There are many modes to produce electricity, but the majority of modern plants use the most suitable mode – Rankin cycle. But in a combination to the modern nuclear power plants, this cycle gives small efficiency (about 35%). If we want to increase efficiency, we must use supercritical steam Rankin cycle with increases steam parameters. Usual PWR cannot provide these parameters, but MHTGR can do this. Let’s consider variants coupling of MHTGR-250 with supercritical Rankin cycle. There are two types of supercritical cycle: first, is the standard once-reheat supercritical steam cycle of which the steam from high pressure turbine will be sent to the steam generator vessel for reheat by the primary loop; second, is the supercritical steam cycle with reheat by life steam separated from the outlet of the steam generator. There are two types of configurations MHTGR modules with first variant of supercritical steam cycle. First variant is four modules of MHTGR-250 with 250 MW of thermal power are designed to supply the life steam parameters to high pressure turbine, while one MHTGR-250 with 234 MW of thermal power is designed to supply the reheat steam. Second variant is each MHTGR-250 module is designed to supply both the life steam and the reheat steam parameters. Each of these variants has big weakness, which reduce an economic efficiency. Configuration MHTGR modules with second type of supercritical steam cycle easier: five MHTGR-250 modules are couple with one steam turbine set. The main part of the life steam from the steam generator exit enters high pressure turbine. The steam from high pressure turbine exit is reheated by the other part of the life steam and enters into intermediate pressure turbine and low pressure turbine. Despite on other disadvantages MHTGR-250 supercritical plant show quite high efficiency (about 4550%). For a plant with service life of 40 to 60 years, such an improvement in efficiency is of extreme technical advance.