定义了测量冷却剂参数的附加仪器的要求，当冷却剂的一个或两个相或反应堆容器中包含气体出现异常情况时，这些仪器是有意义的。获得的冷却液状况信息有助于操作员决定维持足够堆芯冷却所需的措施。

Defines requirements for additional instrumentation to measure coolant parameters, which are of interest when abnormal conditions arise with either one or two phases of coolant or with gas included in the reactor vessel. The information obtained on coolant conditions assists the operator to decide on actions needed to maintain adequate core cooling.