Accident tritium source item inversion method based on plant tritium monitoring data

A technology of monitoring data and plants, applied in the field of accident tritium source item inversion based on plant tritium monitoring data, can solve the problem that the accident source item evaluation method is difficult to be directly applied

Active Publication Date: 2017-06-13
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The invention solves the technical problem: overcomes the deficiencies of the prior art, provides an accident tritium source item inversion method based on pla...

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  • Accident tritium source item inversion method based on plant tritium monitoring data
  • Accident tritium source item inversion method based on plant tritium monitoring data
  • Accident tritium source item inversion method based on plant tritium monitoring data

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example

[0049] 1g of HTO was released in an accident. Under certain environmental conditions, the concentration of HTO in the air at a distance of 500m downwind changes with time, the duration is about 1532s, and the peak concentration reaches 10 8 Bq / m 3 , the duration of reevaporative release is about 363h, and the concentration ranges from 10 5 Bq / m 3 Decrease gradually over time. Taking leafy plants as an example, the HTO concentration in the plant changes exponentially, first increasing, the concentration is about 600Bq / kg at 0.05h, about 1800Bq / kg at 0.1h, reaching the peak at 0.18h, about 2400Bq / kg, and then gradually decreasing. After 500h, the concentration decreased to 500Bq / kg. During the whole time period after the accident, the OBT concentration continued to increase, and finally reached a steady state, about 30000Bq / kg.

[0050] Therefore, the accidental release of 1g of HTO can be calculated, and the changes of HTO and OBT concentrations in plants with the time afte...

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Abstract

The invention discloses an accident tritium source item inversion method based on plant tritium monitoring data and belongs to the field of radiation protection. The accident tritium source item inversion method comprises the following steps that a tritium dynamic atmospheric dispersion model, a multi-level and multi-type soil migration model and a dynamic plant metabolism model are established; tritium release source items under the accident conditions are inversed by adopting a coupling source item inversion algorithm based on the plant tritium monitoring data. The method utilizes the advantages of easy collection and monitoring of plant tritium, the problem of an online gaseous tritium (HTO/HT)monitoring technology of the atmospheric dispersion model for inversing a tritium accident source item adopted in a traditional method is solved, important data is provided for radiation protection and relevant emergency actions after fusion reactor tritium accidents, and accordingly the method has the important guidance significance on fusion reactor tritium accident emergency preparation and fusion reactor safety system design.

Description

technical field [0001] The invention belongs to the field of radiation protection, and mainly relates to a source item inversion method, in particular to an accident tritium source item inversion method based on plant tritium monitoring data. Background technique [0002] In fusion nuclear safety assessment, the release source item is the source of assessing environmental / public risks. The tritium release source item in fusion reactor accident conditions plays an important role in the total radioactive release source item, and special attention should be paid to the tritium release source item. The source item of radioactive release in accident conditions describes the release state of radioactive substances to the environment in nuclear accidents, and is an important basis for radiation protection and related emergency actions after nuclear accidents. The experience of fission reactor accidents (such as the Fukushima nuclear accident) shows that delay in the assessment of r...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 聂保杰吴宜灿王明煌倪木一
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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