On-line measurement equipment and method for evaluating efficiency of iodine absorber by non-radioactive methyl iodide

Abstract

The invention relates to on-line measurement equipment for evaluating efficiency of an iodine absorber by non-radioactive methyl iodide. The on-line measurement equipment comprises an experiment reagent import assembly and an experiment reagent export assembly, wherein the experiment reagent import assembly is connected with an air inlet end of the iodine absorber, the experiment reagent export assembly is connected with an air outlet end of the iodine absorber, the experiment reagent import assembly comprises an experiment reagent import pipe, the experiment reagent import pipe is connected with an upstream acquisition pipe and an experiment reagent injection pipe, the experiment reagent export assembly comprises an experiment reagent export pipe, the experiment reagent export pipe is connected with the air outlet end of the iodine absorber, the experiment reagent export pipe is connected with a downstream acquisition pipe, the experiment reagent injection pipe is connected with an impulse-type methyl iodide gas generator, and the upstream acquisition pipe and the downstream acquisition pipe both are connected with a PID gas detector. In the on-line measurement equipment, the non-radioactive methyl iodide is used as an experiment reagent to perform efficiency test on the iodine absorber, the radioactive operation in efficiency experiment of the iodine absorber is prevented, anoperation risk is reduced, and the situation that radioactive gas is discharged caused by absorption efficiency disqualification of the iodine absorber or operation mistake during the experiment process is eliminated.

Description

technical field [0001] The invention relates to the field of nuclear facilities, in particular to an on-line measurement device and a method for evaluating the efficiency of an iodine adsorber by using non-radioactive methyl iodide. Background technique [0002] Reactors will inevitably produce radioactive iodine during normal operation and accidents. The gaseous radioactive iodine mainly appears as molecular iodine (129I2, 131I2) and organic iodine (CH3131I), of which organic iodine only accounts for 5-10% of the gaseous radioactive iodine. . Although the concentration of radioactive iodine is low, the human thyroid gland has a high absorption capacity for radioactive iodine, so it is still very harmful to the human body after inhalation. Therefore, it is necessary to use an iodine filter (or iodine adsorber) in the ventilation system of a nuclear power plant to absorb iodine, so as to protect workers and the environment from its harm. [0003] In order to ensure the effe...

AI Technical Summary

Problems solved by technology

However, due to the need to use unsealed radioactive source reagents to prepare test media in the test, the procurement, transportation, storage, and management of radioactive iodine sources are strictly controlled, with many procedures and high costs; moreover, gaseous radioactive methyl The preparation of iodine involves radioactive operations, which have high technical requirements for operators. Once the operation is improper, there is a risk of uncontrollable spillage of radioactive gases; in addition, if the installation of the iodine adsorber to be tested is defective or the efficiency of the iodine adsorber itself is not satisfactory When required, there is the issue of accidental release of radioactive gases with this method, which in turn poses a risk of contamination to workers and the environment

[0004] In order to avoid the shortcomings of the above method in the efficiency test of the iodine adsorber, a kind of online detection equipment and method for measuring the efficiency of the iodine adsorber with non-radioactive methyl iodide is now developed

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