They are the natural circulation flow analysis code (MC-FLOW), the core thermal hydraulic analysis code (MC-THAS) and the pulsed reactor transient analysis code (MC-TRAN).

它包括脉冲堆自然循环分析程序（MC-FLOW）、堆芯热工水力分析程序（MC-THAS）和脉冲堆瞬态分析程序（MC-TRAN）。

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The RELAP5 code is a great thermal-hydraulic transient analysis code at present, and it is as the tool of studying passive safety in this thesis.

RELAP5程序是目前大型的热工水力瞬态分析程序，本文把它作为非能动安全研究的工具。

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