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A computer code for the thermal-hydraulic analysis of a helical-coil-type once through steam generator   DING Xueyou1,2, WEN Qinglong1,2, WANG Hongyang1,2, RUAN Shenhui1,2, and CHEN Zhiqiang1,2   1. Department of Nuclear Engineering, College of Power Engineering, Chongqing University. Chongqing, 40044, China 2. Key Laboratory of Low Grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education of China. Chongqing, 40044, China (qlwen@cqu.edu.cn; xueyouding@outlook.com)   Abstract: A helical-coil-type once through steam generators (HOTSG) are considered as the first choice for its advantages in compactness and increasing of heat transfer in Small Modular Reactor (SMR). In this study, a mathematical modelsof void fraction, pressure drop, and heat transfer for different boiling flow conditions in a helical coil tube were presented and a computer code (OTSG-TH）for thermal-hydraulic analysis of theHOTSGwas developed. Firstly, calculations were carefully validated and verifiedwith steady-state results of ONCESG(Once Through Steam Generator)code and MRX (Marine Reactor X) experiment. The code was used for thermal hydraulic analyses and geometric design of a HOTSG. A postulated scenario of loss of feed water, was also analyzed in this study. It hasshowed that the OTSG-TH code can be successfully used for steady and transient stateanalyses of a HOTSG. Keyword:OTSG; helical-coil-tube; two-fluid model;thermal-hydraulic
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