A treatment system for low-level radioactive waste gas from a lead-bismuth pile

Abstract

The invention discloses a treatment system for exhaust gas of low-level radioactivity in a lead-bismuth reactor. The system comprises an exhaust gas inlet, a filtering unit, a compression and temporary storage unit, a stagnating unit and a radioactivity monitoring unit, wherein the exhaust gas inlet is used for inputting radioactive exhaust gas to be treated, the filtering unit is used for filtering aerosol and particulate matters in the exhaust gas, the compression and temporary storage unit is used for carrying out pressurizing and temporary storage on the filtered exhaust gas, the stagnating unit is used for carrying out stagnated decaying on the exhaust gas which is subjected to pressurized output by the compression and temporary storage unit, and the radioactivity monitoring unit is used for acquiring exhaust gas of multiple positions in the system and analyzing radioactive concentration of the exhaust gas; and the exhaust gas inlet, the filtering unit, the compression and temporary storage unit and the stagnating unit are connected in order through a pipeline. According to the system disclosed by the invention, a temporary storage function is set, and the stagnated decaying pressure is increased, so that the treatment capacity and treatment efficiency are greatly increased, and the range of application is more extensive. Due to monitoring and linked control, the safety and operability of the system are greatly guaranteed.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant radioactive waste gas treatment, in particular to a low-level radioactive waste gas treatment system in a lead-bismuth pile. Background technique [0002] The lead-bismuth reactor is an advanced nuclear energy system composed of an accelerator, a spallation target, and a subcritical fast neutron reactor, which can achieve the purpose of long-lived high-radioactive nuclide transmutation, multiplication of nuclear fuel, and nuclear power generation. Different from conventional pressurized water reactor nuclear power plants, the coolant of the lead-bismuth reactor is liquid lead-bismuth alloy, and the covering gas of the primary circuit is argon. During the operation of the lead-bismuth reactor, the fission of the reactor produces radionuclides, such as Kr, Xe and other substances, which enter the reactor coolant when the fuel cladding is damaged, and then release into the gaseous space; ...

AI Technical Summary

Problems solved by technology

[0004] 1) The conventional pressurized storage and retention decay technology only performs decay treatment for inert gases, and cannot remove aerosols and other substances, especially the highly toxic radionuclide polonium unique to lead-bismuth piles;

[0005] 2) The traditional pressurized storage process compresses the exhaust gas into the decay box for decay, which has the problems of large number of decay boxes, large size, large floor area, and long storage time under pressure;

[0006] 3) The traditional stagnation decay technology delay bed has a small treatment flow rate, which is only suitable for small flow waste gas treatment occasions, and when the outlet radioactivity exceeds the standard, the upstream input must be cut off to affect the upstream operation

Images