Method and system for monitoring radioactivity of main loop coolants in nuclear power plant

A technology of radioactivity and main circuit, applied in the field of radioactivity monitoring, can solve the problems of increasing the occupational exposure dose of staff, heavy workload of staff, low detection efficiency, etc. Effect

Inactive Publication Date: 2018-12-14
中广核工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the existing nuclear power plant circuit coolant radiation detection method not only has a heavy workload for t...

Method used

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  • Method and system for monitoring radioactivity of main loop coolants in nuclear power plant
  • Method and system for monitoring radioactivity of main loop coolants in nuclear power plant
  • Method and system for monitoring radioactivity of main loop coolants in nuclear power plant

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Embodiment 1

[0034] The embodiment of the present invention provides a nuclear power plant main loop coolant radioactive activity monitoring system, which is suitable for real-time monitoring and early warning of the radioactivity of the coolant in the nuclear power plant main loop, see figure 1 , the system may include: a gamma ray detector 100 , an energy spectrum analyzer 200 , and a computer 300 .

[0035] The gamma ray detector 100 is arranged on the main loop of the nuclear power plant (i.e. the primary loop of the nuclear power plant, in which the coolant used to guide the thermal energy in the reactor core to the steam generator circulates), and is used to collect radionuclides in the coolant of the main loop Released gamma ray signal.

[0036] Aiming at a series of inconveniences caused by manual acquisition of coolant in the main circuit of the nuclear power plant for radioactivity detection in the prior art (low detection efficiency, risk of radiation exposure to test personnel,...

Embodiment 2

[0064] The embodiment of the present invention provides a method for monitoring the radioactive activity of the coolant in the main loop of a nuclear power plant, which is suitable for real-time monitoring and early warning of the radioactivity of the coolant in the main loop of a nuclear power plant. See image 3 , the method can include:

[0065] Step S11, using the γ-ray detector preset on the main circuit of the nuclear power plant to measure the γ-ray signal released by the radionuclide in the coolant of the main circuit, and calculate the radioactivity data of the corresponding nuclide.

[0066] Aiming at a series of inconveniences caused by manual acquisition of coolant in the main circuit of the nuclear power plant for radioactivity detection in the prior art (low detection efficiency, risk of radiation exposure to test personnel, etc.), in this embodiment, the main circuit of the nuclear power plant is used to A gamma-ray detector is loaded on it to monitor the radioa...

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Abstract

The invention discloses a method and system for monitoring the radioactivity of main loop coolants in a nuclear power plant. The system comprises a gamma-ray detector, an energy spectrum analyzer anda computer. According to the system disclosed by the invention, through the gamma-ray detector based on a semiconductor detector, a scintillation detector and a coincidence circuit, on-line continuousgamma-energy spectrum measurement of the main loop coolants in the nuclear power plant is realized, further the analysis of the radioactivity of characteristic nuclides in the main loop coolants is completed, and the work that a worker samples for performing measurement and analysis in a laboratory can be replaced; workload of the worker is reduced, the exposure dose of the worker is reduced, andthe monitoring efficiency is improved; and in addition, through the scintillation detector and the coincidence circuit, the influence of Compton scattering rays and environmental background gamma-rays on low-energy nuclide recognition and a main nuclide activity analysis result in the main loop coolants can be effectively reduced, and the accuracy of the measuring result is improved.

Description

technical field [0001] The invention relates to the technical field of radioactivity monitoring, in particular to a method and system for monitoring radioactive activity of coolant in a main circuit of a nuclear power plant. Background technique [0002] The radioactivity of the coolant in the main circuit of the nuclear power plant directly reflects the integrity of the fuel cladding, the first barrier of the defense-in-depth system of the pressurized water reactor nuclear power plant. Once the fuel cladding is damaged, the radioactive fission products in the gap between the fuel cladding and the pellets will leak into the main loop coolant circulation loop, and the radioactive activity level of the main loop coolant will increase, directly leading to an increase in the overall radioactivity level of the nuclear power plant. It will have an extremely adverse impact on the staff of the nuclear power plant, the surrounding environment and the public. [0003] Existing nuclea...

Claims

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Application Information

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IPC IPC(8): G21C17/022
CPCG21C17/022Y02E30/30
Inventor 陈小强熊军肖明唐邵华潘跃龙王鑫杨彬华
Owner 中广核工程有限公司
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