200MW核供热堆堆芯燃料元件盒冷却剂出口温度测量方法实验研究

提出了将200MW核供热堆芯燃料元件盒支承格子板的一个侧面设计成空交沟槽结构，并在其中放置铠装热电偶测量堆芯燃料元件盒冷却剂出口温度的设计方案。经实验表明，支承格子板侧面空间正交沟槽结构，不仅能有效地导流冷却剂，而且增长了铠装热电偶的感温长度，减小了测导热损失误差，从而提高了测量精度。因此，其测量方法能满足工程上对温度测量精度的要求。

Experimental Study on Measurement Method of Exit Temperature of Coolant of Fuel Assembly in Core of 200 MW Nuclear Heating Reactor

This paper presents a new measurement method， i.e.a sheathed thermocouple is immersed in a space orthogonal slot that is located at one side of support grid plate of fuel assembly.The experimental results show that this method can satisfy with the accuracy of temperature measurement.The structure of space orthogonal slot in the grid plate is good for flow of coolant， which increases the sense length of sheathed thermocouple， so it reduces the error of loss of heat conduction and improves the accuracy of temperature measurement.