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Erschienen in:

2017 | OriginalPaper | Buchkapitel

3. Plant Concepts and Mechanisms

verfasst von : Masakazu Ichimiya

Erschienen in: Fast Reactor System Design

Verlag: Springer Singapore

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Abstract

This chapter introduces the required functions of the FR, namely, to breed fuel and reduce the toxicity of high-level radioactive waste. It also describes the mechanism of how this is achieved using plutonium and fast neutrons. The use of fast neutrons requires the use of liquid metal sodium as the core coolant. Sodium is also used to transport heat from the reactor core to the steam turbine which results in a unique design condition under which the entire plant becomes a elevated-temperature, low-pressure system.

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Vorheriges Kapitel Purpose and History of Fast Reactors

Nächstes Kapitel Policy of Safety Assurance (Design Constraints and Additional Functional Requirements)

While neutrons produced by fission have an average energy of 2 MeV, since those neutrons are easily moderated to 1 MeV or less by inelastic scattering with heavy nuclides, such as fertile material, it is considerably difficult to make C larger than 1 in the case of ²³⁵U.

*Fifteen elements from 89th (actinium) to 103rd (lawrencium) in the periodic table are generally called actinoid elements, and all these elements except actinium are called actinide elements. Furthermore, Np, Am, and Cm that are less abundant than U, Pu in spent fuel are called minor actinides.

The following are influencing factors. These values are dependent on reactor core design. Usually factors (1) and (2) are dominant.

Spectrum hardening → increase in η value of 239Pu → change toward positive

Increase in neutron leakage →change toward negative

Decrease in neutron capture → change toward positive

Change in self-shielding effect

The range where a control rod exerts influence is within two or three times the neutron migration length M from the relevant control rod position.

Japan Atomic Energy Agency, Feasibility study on commercialized fast reactor cycle systems, Technical Study Report of Phase II-(1) Fast Reactor Plant Systems, JAEA-Research 2006-042, April 2006

Titel: Plant Concepts and Mechanisms
verfasst von: Masakazu Ichimiya
Verlag: Springer Singapore
Buch: Fast Reactor System Design
Print ISBN: 978-981-10-2820-5

Electronic ISBN: 978-981-10-2821-2

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-981-10-2821-2_3