UPGRADING ARIZONA PUBLIC SERVICE'S PALO VERDE NUCLEAR GENERATING STATION (PVNGS) SIMULATOR TO RELAP5-RT THERMAL HYDRAULICS AND MULTI-DIMENSIONAL NEUTRON KINETICS

摘要

Limitation in the current PVNGS training simulator, Reactor Coolant System (RCS) model, specifically in the lower mode operation such as reduced RCS inventory (mid-loop operation), necessitated the implementation of RELAP5 (1) into the PVNGS simulator. This enhancement also has added many benefits in the area of neutronics due to the facts that RELAP5 contains a Reactor Kinetics Model which is a multi-dimensional neutron Kinetics model based on the NESTLE (2). The Kinetics addition helped us in the areas of Axial Shape Index (ASI) and azmitual tilt and local rod drops which is important in digital power plant for trip. This paper will describe the process of implementation of RELAP5 and nodalization approach for modeling the PVNGS simulator.