Identification of Asymmetry Reactor Flow Characteristics for a Single Pump Failure Condition with 1/5 Scale linearly Reduced Facilities Referring to APR+

摘要

To quantify the flow distribution characteristics of an APR+ reactor, a test was performed on a test facility, ACOP (APR+ Core Flow &Pressure Test Facility), having a length scale of 1/5 referring to the prototype plant. The test program broadly consists of three reactor flow conditions: (1) normal balanced cold leg flow condition (2) 5% unbalanced cold leg flow condition, and (3) extreme unbalanced flow condition under the assumption of a single pump failure. The present study corresponds to the last case. The core inlet flow, outlet pressure distribution and sectional pressure drops along the major flow path inside the reactor vessel are interesting parameters to be measured. To preserve the flow characteristics of the prototype plant, the test facility was designed based on a preservation of the major flow path geometry. The reactor flow characteristics are quantified with a 1/47.7 of Reynolds number scaling ratio for the flow region except for the core section. ACOP simplifies each fuel assembly into a hydraulic simulator having similar axial and lateral flow characteristics. The final identification of the reactor flow distribution was obtained by an ensemble averaging process of 9 independent test data. The details of the design of the test facility, experiment, and data analysis were included in the current paper.