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Report No.

Study of thermal influence on tubes due to sodium-water reactions in LMFBR steam generator

Hamada, Hirotsugu  ; Kurihara, Akikazu ; Nishimura, Masahiro 

A study of thermal influence on heat-transfer tubes in sodium-water reactions is carried out to precisely evaluate the tube rupture due to overheating in the water leak accident of an LMFBR steam generator (SG). By assuming the sodium-water reaction jet to be a two-phase flow that consists of sodium and hydrogen, the heat-transfer characteristics are examined and a simple model of effective heat-transfer coefficient (HTC) is proposed for the safety evaluation in the SG. Comparison of the model with experimental data leads to the following conclusions: An upper limit exists in the HTC between reaction jet to tube wall, and it is equivalent in approximation to the HTC of single-phase sodium flow. The HTC can be written in simpler form as functions of the HTC of single-phase sodium flow, void fraction and temperatures of sodium, hydrogen and tube wall. Hydrogen provides negligible heating effect, so that the apparent HTC would decrease with increasing of the hydrogen temperature that



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