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Accelerator-driven nuclear system with control of effective neutron multiplication coefficent

An accelerator-driven, neutron technology, used in the control of nuclear reactions, nuclear engineering, nuclear reactors, etc., can solve problems such as high beam power

Inactive Publication Date: 2013-02-27
JACOBS E&C
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  • Abstract
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Problems solved by technology

However, these studies are not entirely sufficient to define the practical reactivity monitoring and necessary feedback control procedures applicable to the operation of commercial, high-power accelerator-driven systems in which instead large and continuous beam powers, i.e., similar to Regulatory method for common critical reactors

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  • Accelerator-driven nuclear system with control of effective neutron multiplication coefficent
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  • Accelerator-driven nuclear system with control of effective neutron multiplication coefficent

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Embodiment Construction

[0070] The objects, features and advantages of the present invention will be explained in more detail with the help of the following preferred embodiments. Other objects and advantages of the present invention will become apparent from consideration of the ensuing description and accompanying drawings. All of these specific examples are intended for purposes of illustration and do not limit the scope of the invention.

[0071] In the ADS schematically illustrated in FIG. 1 , fission neutrons are generated in a target 101 located in the central region of the reactor core 100 by directing high-energy particles, such as protons with kinetic energies up to 1 GeV, onto heavy nuclei forming the target 101 . Among the different materials suitable for use in fission targets, lead can be advantageously used due to its high neutron yield when struck by high energy protons. Likewise, lead in liquid phase can also be used as a coolant to receive the thermal power of the core. Other...

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Abstract

An accelerator-driven subcritical breeding reactor is operated with a neutron multiplication coefficient as large as possible in order to require a small input power from the accelerator, reducing its dimension and hence its cost and complexity. The beam-generated spallation neutron yield then becomes comparable to the fraction of delayed neutrons from the fissioned elements. This can be exploited to ensure an accurate on-line determination of the reactivity. Resulting changes can be adjusted with the help of neutron absorbing control rods and / or variations of the proton current. In addition, the temperature variations during operation can be continuously monitored and adjusted in order to avoid that the subcritical systems approaches too closely the (delayed) criticality condition and that the neutron multiplication coefficient remains within acceptable limits.

Description

technical field [0001] The present invention relates to accelerator drive systems (ADS). Background technique [0002] In recent years, there has been a significant increase in global interest in accelerator-driven subcritical reactors, such as Trans Uranic (TRU) burners, and thorium-based breeder reactors, such as the energy amplifier (EA) disclosed in WO95 / 12203. [0003] In subcritical systems, neutron multiplication is less than 1, especially with the use of additional neutrons generated by external proton accelerators to ensure operation of the multiplication reaction chain. Subcriticality occurs particularly advantageously in certain applications, including the contribution of effective delayed neutrons much smaller than those in ordinary pressurized water reactors (PWRs), small or poor Doppler temperature coefficients, and There may also be a positive cavitation coefficient depending on the condition of the coolant. Subcritical operation is particularly beneficial i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C1/30G21C7/34G21D3/10
CPCG21C7/34G21C1/30G21C17/104G21C1/03Y02E30/39Y02E30/37G21D3/10Y02E30/30Y02E30/00G21C1/303
Inventor 卡洛·鲁布比亚
Owner JACOBS E&C
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