Thermal-hydraulics Analysis of Annular Fuel Application in SCWR

Abstract

The annular fuel is a new fuel type with annular shape which allows both the internal and external cooling abilities. First, two coolant flow schemes, which are named in-out type and out-in type, have been compared with single channel model from both aspects of physics and thermal-hydraulic, and the latter one was finally selected. Then, with the selected flow scheme, subchannel analysis with modified ATHAS code was carried out. The results showed that application of annular fuel in supercritical water reactor can reduce both cladding temperature and fuel pellet temperature effectively.