Abstract
Nuclear Power Engineering Corporation (NUPEC) has completed the proving test for thermal-hydraulic performance of high burnup 8×8 fuel assembly. The high-burnup 8×8 fuel is a new type of BWR fuel assembly. New concepts such as ferrule type spacer and a large diameter central water rod are introduced in order to improve the thermal margin and reactor shut down margin for the higher uranium enrichment. The purpose of this test is to prove the thermal-hydraulic performance of this fuel and to verity the current BWR thermal-hydraulic design base.The tests were carried out in an out-of pile test facility that can simulate the high pressure and high temperature conditions of BWRs. An electrically heated test assembly simulated a BWR fuel bundle on full scale.The current BWR design method was compared with measured thermal-hydraulic data (data for critical power under steady state and unsteady state conditions, pressure drop and flow induced vibration of fuel rod). It was verified that the current BWR core design base has the enough reliability.
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