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１０ＭＷ模块式高温气冷反应堆（ＨＴＲ－１０）的热气导管压力壳的双端断裂事故属假想极限事故。当热气导管断裂后，高压的一回路冷却剂气体（３ＭＰａ）通过破口向堆舱猛烈喷放，一回路迅速卸压，并形成强卸压冲击波。利用了改进后的Ｋ－ＦＩＸ（ＦＬＸ）程序，对该事故下冷却气体喷放过程中堆体内主要结构部件（压力壳左支承、堆芯壳支承、堆芯壳）的安全特性进行了瞬态分析。通过计算，给出了破口处的压力瞬变、流量瞬变和堆芯壳上下两端的压差瞬变，以及在卸压冲击波作用下堆芯壳的膜应力和弯曲应力。最后，利用计算分析定量地给出了大破口极限事故下ＨＴＲ－１０的堆体主要结构部件的安全系数。结果表明，即使在极限事故下，ＨＴＲ－１０堆体结构仍有良好的安全特性。
The double-ended fracture of the hot gas duct pressure shell of a 10 MW modular HTR-10 reactor is a hypothetical extreme accident. After the hot gas conduit breaks, the high-pressure primary coolant gas (3MPa) is violently discharged to the stack through the breach, and the primary circuit rapidly decompresses and forms a strong relief shock wave. The improved K-FIX (FLX) program was used to transiently detect the safety characteristics of the main structural components (pressure shell left support, core shell support and core shell) in the pile during the discharge of cooling gas under the accident analysis. Through calculation, the pressure transients, flow transients and pressure transients at the upper and lower ends of the core shell and the film stress and bending stress of the core shell under the pressure relief shock wave are given. Finally, the safety factor of the main structural components of the HTR-10 reactor under heavy-break extreme accident is quantitatively given out by means of computational analysis. The results show that the HTR-10 pile structure has good safety features even under extreme conditions.