Control system for the RBMK-1500 RELAP5 model

1. INTRODUCTION

The purpose of this analysis is to document the control system logic for the RELAP5 model [1] of the RBMK-1500 [2]. The control system consists of control variables and trip logic to control or specify boundary conditions for the model during normal operating conditions as well as anticipated transient conditions.

The plant model has been developed and is fully described in Reference [2]. The scope of the plant model is defined as follows;

• graphite structures in the reactor vessel,

• the left hand side (LHS) and right hand side (RHS) pressure tubes and the fuel pins,

• main coolant circuit including the pumps, piping, valves, and steam drums,

• steam lines including the turbine control valve (TCV) and over-pressure protection valves,

• feedwater injection,

• point kinetics reactor physics power calculation, and

• short- and long-term Emergency Core Cooling Systems (ECCS).

This analysis describes the principle control system logic needed to perform transient calculations. The following control systems are described;