Neutron irradiation monitoring system and method for reactor pressure vessel

Abstract

The invention relates to a neutron irradiation monitoring system and method for a reactor pressure vessel. The system comprises: an irradiation monitoring tube, which is disposed in the reactor pressure vessel and is internally provided with a material sample and a first dose detection element; an out-of-pile detection box, which is arranged between the outer wall of the reactor pressure vessel and pile pit concrete, wherein a second dose detection element is arranged in the out-of-pile detection box; a model building module, which is used for building a neutron fluence model of the reactor pressure vessel material according to the detection data of the first dose detection element and the second dose detection element and the mounting position of the second dose detection element; and a model application module , which is used for sending detection data of the first dose detection element and/or the second dose detection element into the neutron fluence model so as to obtain neutron fluence data of the reactor pressure vessel material. By implementing the above technical scheme of the invention, the full-period monitoring of neutron fluence of the reactor pressure vessel is realized.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a neutron radiation monitoring system and method for a reactor pressure vessel. Background technique [0002] The reactor pressure vessel is one of the non-replaceable equipment of the nuclear power plant, and its service life determines the operating life of the nuclear power plant. Reactor pressure vessel cylinder and weld material are ferritic low-alloy steel. Under long-term fast neutron irradiation, it will cause radiation embrittlement damage to the material and cause brittle fracture of the material. Therefore, in the design of the reactor pressure vessel, the neutron of the reactor should be detected, and the radiation embrittlement of the material of the reactor pressure vessel should be evaluated according to the measured neutron fluence data. [0003] At present, the radiation monitoring of reactor pressure vessel materials in pressurized water reactors is generally to in...

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Problems solved by technology

[0005] 1. According to the review requirements, the irradiation supervisory tube must be removed within a certain number of years, resulting in the inability to continue monitoring the neutron flux of the reactor pressure vessel for a long period of time;

[0006] 2. The radiation supervisor can only provide one data point at a time;

[0007] 3. It is expensive to install the irradiation monitoring tube again, the operation is complicated, and the representativeness of the sample is not enough to explain the influence of the cumulative fluence

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