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Validation and application of thermal hydraulic system code for analysis of helically coiled heat exchanger in high-temperature environment

Sato, Hiroyuki  ; Ohashi, Hirofumi ; Nakagawa, Shigeaki  ; Tachibana, Yukio ; Kunitomi, Kazuhiko 

A qualification of the thermal hydraulic system code RELAP5 code is conducted for the analysis of helically-coiled heat exchangers used in high temperature environment. The experimental data obtained from the HTTR are utilized to compare with calculated data by RELAP5-based model with built-in closure models. A set of closure model is also suggested considering the heat transfer enhancement by thermal radiation based on the past separate effect test data and validated against the measured data. In addition, the modified RELAP5 code is tested for the analysis of the HTTR-IS system. The comparison of calculated and measure data with steady state operation showed that the prediction temperature with the suggested model generally agreed well. As a conclusion of the present study, the use of thermal hydraulic system code with the suggested closure model is acceptable for the analysis of the IHX in HTGR nuclear hydrogen production systems in the safety evaluation.

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Category:Nuclear Science & Technology

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