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Method for cancelling secondary neutron source of reactor

A technology for secondary neutrons and reactors, applied in reactors, nuclear reactor monitoring, fuel element assembly, etc., can solve the problem of increasing the specific activity of Sb-124 in the primary circuit coolant, increasing the generation and discharge of tritium in power plants, and increasing procurement Cost and other issues, to achieve the effect of reducing procurement costs, reducing emissions, and reducing specific activity

Inactive Publication Date: 2017-06-27
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0003] The use of the secondary neutron source has the following disadvantages: 1) additionally increases the generation and discharge of tritium in the power plant; 2) has the risk of increasing the specific activity of Sb-124 in the primary circuit coolant; 3) the secondary neutron source has a certain The service life of the nuclear power plant will be replaced many times during the lifetime of the nuclear power plant, which will increase unnecessary procurement costs

Method used

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  • Method for cancelling secondary neutron source of reactor

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Embodiment

[0017] In this embodiment, a reactor core using 177 fuel assemblies is taken as an example.

[0018] Such as figure 1 As shown, a method for canceling the secondary neutron source of the reactor, the secondary neutron source assembly traditionally arranged in the reactor core is canceled, and the deep burnup fuel assembly ( The ones unloaded in the previous cycle, which have gone through at least 2 cycles) are respectively placed on the periphery of the core, that is, the detector closest to the source range (i.e. figure 1 In the position of SRC1, SRC2), at least one detector should be arranged near a single detector; in the later stage of the charging stage, after the peripheral components are basically arranged, the deep burn-up fuel assembly is moved from the periphery of the core to the position of the loading map, or Removed and returned to the spent fuel pool. The early stage of the charging stage means that a small part of the fuel has been loaded into the core, and t...

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Abstract

The invention discloses a method for cancelling a secondary neutron source of a reactor. A reactor core is not loaded with and does not use a secondary neutron source assembly, and neutrons released by a postdose fuel assembly loaded in the reactor core are utilized to make neutron counting rate meet requirements. The method for cancelling the secondary neutron source of the reactor has the advantages that the neutrons released by postdose fuel are utilized to meet critical safety supervision requirements during follow-up circulation reactor loading and physical start-up period; the secondary neutron source assembly does not need to be introduced again to the reactor core, and the reactor start-up process can be monitored by follow-up circulation.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor design, in particular to a method for canceling a secondary neutron source in a reactor. Background technique [0002] During the charging and start-up of the pressurized water reactor nuclear power plant reactor, it is necessary to monitor the fission reaction rate and its changes in the core, so as to prevent the reactor from reaching an uncontrollable instantaneous critical state. In nuclear power plants in service in China, the reactor start-up monitoring uses external source range detectors, which are far away from the core. The introduction of a secondary neutron source in the core can increase the neutron injection at the subsequent cycle detectors after the first cycle. volume rate and count rate. At present, a typical nuclear power plant pressurized water reactor core will introduce two secondary neutron source assemblies symmetrically into the core. More than 10cps, far greater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/30G21C17/104
CPCG21C3/30G21C17/104Y02E30/30
Inventor 肖锋谭怡吕焕文李兰刘嘉嘉魏述平王军龙唐松乾
Owner NUCLEAR POWER INSTITUTE OF CHINA
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