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一、前言铠装热电偶是反应堆热工测量及控制的重要元件。它的可靠性直接影响反应堆的安全运行。1981年4月在堆外的一次稳压器动态特性试验中,使用了一组由7支φ2铠装热电偶(EU),组成的测温元件,在最高为345℃高纯除氧水中运行不到100小时,其中三支呈现波浪形破损。破口由热接点焊头起贯串全长,最长达1.28m(见图1)。破损率之高,破损时间之短,破口之长,前所未遇。为弄清破损的
I. INTRODUCTION Armored thermocouples are an important component of reactor thermal measurement and control. Its reliability directly affects the safe operation of the reactor. April 1981 in a reactor outside the reactor dynamic test, the use of a set of 7 φ2 armored thermocouple (EU), the composition of the temperature measuring element, up to 345 ℃ high-purity oxygen water run Less than 100 hours, three of them showed wavy breakage. Broken by the hot welding head up through the whole length, up to 1.28m (see Figure 1). The damage rate is high, the damage time is short, break the long, hitherto unknown. To understand the damage