Inadequate-core-cooling instrumentation using differential pressure for reactor-vessel level measurement. [PWR]

This document presents a technical review of the Inadequate Core Cooling Instrumentation with a Reactor Vessel Level Monitoring System using a differential pressure measurement system proposed by Westinghouse Inc., for pressurized water reactors. This system is Westinghouse's response to requirements of NUREG-0737 to evaluate the need for additional instrumentation to detect the approach to inadequate core cooling and in particular to evaluate means for measuring reactor vessel water level. Because the question of the need for reactor vessel measurement instrumentation has been a somewhat controversial issue, this report includes a great deal more material than is normally found in a technical review of this nature. It is the intention to provide in one document, coverage of all of the relevant material that has accumulated since the accident at TMI-2.