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压水反应堆堆内温度测量装置是监测反应堆热功率输出及堆内功率分布情况、保证反应堆安全运行的手段之一。该装置以热电偶作为测量元件,用不锈钢作保护外套。由于热电偶有一定的使用寿命,须定期更换,为此研制了一种适用于核电厂反应堆堆内温度测量的热电偶密封结构。这种结构既能在高温高压下密封牢靠,没有泄漏和渗漏,又能在带放射性环境下方便地逐根更换热电偶。它是一种结构简单实用的新型密封结构。
Pressure water reactor reactor temperature measurement device is to monitor the reactor thermal power output and power distribution within the reactor to ensure safe operation of the reactor one of the means. The device uses a thermocouple as a measuring element and a stainless steel jacket. Because the thermocouple has a certain service life, it must be replaced regularly. Therefore, a thermocouple sealing structure suitable for measuring the temperature inside the reactor reactor is developed. This structure not only in the high temperature and pressure seal firmly, without leakage and leakage, but also in a radioactive environment with one by one to replace the thermocouple. It is a simple and practical structure of the new seal.