HTR-PM进气事故缓解措施初步分析
Preliminary Analysis of Air Ingress Accident Mitigation Measure for HTR-PM
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摘要: 热气导管双端断裂（DEGB）事故因其可能造成的严重后果逐渐引起研究者的大量关注。对于200 MWe球床模块式高温气冷堆（HTR-PM），DEGB进气事故是其事故安全分析中重点关注的事故类型。针对HTR-PM DEGB进气事故，提出了从装料管注入一定流量的氮气或氦气以缓解事故后果的方案，并利用系统分析程序TINTE-TIIXUW，计算分析了注入不同流量氮气和氦气对进气事故的缓解效果。分析结果表明，注入氮气时，注气流量需达到一定值才能起到缓解效果，而注入氦气时，注气流量小或大均能有效缓解事故后果，这为后续的实际工程应用提供了很好的参考和帮助。Abstract: Many concerns are paid to the double-ended guillotine break (DEGB) of horizontal gas duct accident because of the possible serious consequence. For the 200 MWe high temperature gas-cooled reactor pebble-bed module (HTR-PM), the DEGB of horizontal gas duct accident is very important for the safety analysis of HTR-PM. The method of injecting a certain flow of nitrogen or helium from the fuel charging tube was proposed to mitigate the consequence of the DEGB of horizontal gas duct accident. By using the system code TINTE-TIIXUW, the mitigation effect when injecting different mass flows of nitrogen or helium on the consequence of DEGB of horizontal gas duct accident was researched. According to the simulation result, the mass flow of nitrogen shall reach a certain value when the nitrogen can play a role in mitigating the consequence. However, as to the helium, both the small flow and the large flow can play a role in mitigating the consequence of air ingress accident, which will be helpful to the future engineering application as a good reference of mitigation measure.
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Keywords:
- HTR-PM ,
- air ingress accident ,
- mass flow of injected gas ,
- mitigation measure
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