High temperature and high pressure experimental bench and method for simulating fuel rod cladding breakage fission product escape behavior

By using a top-mounted suspended fuel rod design and a transient gas injection system controlled by a high-frequency solenoid valve, combined with online mass spectrometry monitoring, the problem of accuracy and real-time monitoring of the escape of fission products from fuel rod breakage under high temperature and high pressure in existing devices has been solved, achieving safe operation and accurate simulation under extreme conditions.

CN122370018APending Publication Date: 2026-07-10XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Filing Date
2026-04-15
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing experimental devices are difficult to operate stably under high temperature and high pressure. The simulation accuracy of transient escape behavior of fission products after fuel rod breakage is low, and the monitoring is lagging, making it impossible to accurately capture transient processes.

Method used

It adopts a top-mounted suspended fuel rod design, a transient gas injection system controlled by a high-frequency solenoid valve, and online mass spectrometry monitoring. Combined with a high-temperature and high-pressure main coolant circulation system, a heating and temperature control system, and an auxiliary vacuum discharge system, it achieves high-pressure safety, accurate transient simulation, and real-time online monitoring.

Benefits of technology

It operates safely under extreme high temperature and pressure, accurately simulates the transient escape behavior of fission products, and enables online real-time monitoring, thereby improving the reference value of experimental results.

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Abstract

The application discloses a high-temperature and high-pressure experiment bench and method for simulating fuel rod cladding breakage fission product escape behavior, and the experiment bench comprises a high-temperature and high-pressure main coolant circulating system, a top-mounted suspension type simulated fuel rod assembly, a gas injection and transient control system, a heating and temperature control system and an online monitoring system. The high-temperature and high-pressure main coolant circulating system provides simulated coolant circulation and comprises a leakage experiment section, a flowmeter, a compressor, a pressure stabilizing pipe and an electric heater; the simulated fuel rod assembly adopts a top-mounted suspension structure and directly reaches the center of the experiment section through a top sealing flange, and a sampling section is arranged at the opening of the experiment section to be connected with an online mass spectrometer, so that online monitoring of components occupied by leaked gas in a flow channel is realized; the gas injection and transient control system comprises a gas storage tank, a downstream high-frequency electromagnetic valve and a pre-tank pressure reducing valve set; and an auxiliary vacuum and exhaust system empties the background gas content of the experiment loop by means of an air pump, so as to ensure the accuracy of experiment measurement. The application can safely reproduce a real core working condition under extremely high temperature and high pressure, so as to study fission product transient escape behavior.
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