Method for estimating thermal neutron fluence of heavy water reactor

A technology of thermal neutrons and heavy water reactors, which is applied in the field of radiation detection, can solve problems such as the inability to directly measure the thermal neutron fluence of heavy water reactors, and achieve the effect that the calculation model is simple, intuitive and easy to implement

Active Publication Date: 2019-04-19
PEKING UNIV
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Problems solved by technology

[0003] In order to overcome the problem that the prior art cannot directly measure the thermal neutron fluence in the heavy water reactor core, the present invention provides a method for estimating the thermal neutron fluence in the heavy water reactor

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  • Method for estimating thermal neutron fluence of heavy water reactor
  • Method for estimating thermal neutron fluence of heavy water reactor
  • Method for estimating thermal neutron fluence of heavy water reactor

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Embodiment Construction

[0041] The method of the present invention will be described below through specific examples, but the present invention is not limited thereto.

[0042] Fe and Ni are elements commonly used in pressure vessels in reactors. Under the irradiation of neutrons in the core, their nuclei undergo (n,γ) reactions, and the abundance of each isotope changes. Natural Fe is only 54 Fe, 56 Fe, 57 Fe and 58 Four isotopes of Fe, but under the irradiation of neutrons in the core, 55 Fe passed 54 Fe(n,γ) 55 Fe reaction produces, and at the same time this part 55 Fe is also passing 55 Fe(n,γ) 56 Fe reaction produces 56 Fe, and so on. This series of reactions will cause the change of Fe isotope. In the same way, the isotopic abundance of Ni or other elements will also change due to neutron irradiation. Since the (n, γ) reaction excitation functions of each isotopic nucleus of Fe and Ni are in the thermal neutron energy region (neutron energy 0.2meVn 56 Fe(n,γ) 57 The excitation fun...

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Abstract

The invention discloses a method for estimating the thermal neutron fluence of a heavy water reactor. According to the method, the structural material of the core of a heavy water reactor is taken outafter neutron irradiation; then the isotope abundance of one or more elements is measured by a nuclear analyzer, because the nuclear material and neutrons (mainly thermal neutrons) carry out radiation capture reactions, the isotope abundances of all elements of the nuclear material change, and thus by measuring the isotope abundances, the thermal neutron fluence on the nuclear material can be estimated under a condition that the running time of the reactor is known. The provided method is simple, and the measurement of thermal neutron fluence is converted into measurement on isotope abundance.

Description

technical field [0001] The invention belongs to the field of radiation detection, in particular to a method for estimating thermal neutron fluence in a heavy water reactor. Background technique [0002] Thermal neutron fluence measurement in heavy water reactor core is a very important parameter in reactor core physics and a key technology in the field of radiation detection. At present, for heavy water reactor core neutrons, the detectors in the control rod assembly are mainly used to directly measure the real-time neutron flux density, and the cumulative physical quantity of thermal neutron fluence cannot be directly measured. Contents of the invention [0003] In order to overcome the problem that the prior art cannot directly measure the thermal neutron fluence in the heavy water reactor core, the present invention provides a method for estimating the thermal neutron fluence in the heavy water reactor. [0004] The invention is based on the effect of changing the abun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/00
CPCG21C17/00Y02E30/30
Inventor 崔增琪张国辉白怀勇江浩雨卢毅胡益伟
Owner PEKING UNIV
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