EBWR CORE 1A PHYSICS ANALYSIS

The studies were primarily directed toward selection of the optimum loading for Core lA and a prediction of its properties. Included are analyses of some relevant experiments on Core 1, and prelimlnary modifications of Core 1 to Core lA. The factors which must be considered for the optimum loading determination are discussed. Four different loading pattenrs were investigated, which were considered to span the numerous possibilitles. Adequate cold shutdown was found to be almost unobtainable without the use of boric acid. For this reason, and because the heat transfer and stability limitations are severe, greater weight was given to heat transfer as opposed to control requirements. The use of boron-stainless steel poison strips fastened to the sides of the spike elements is considered insofar as in improving the loading from either the heat transfer or control standpoint. The relatlve advantages and disadvantages of the use of stainless steel fuel followers as opposed to Zircaloy followers are discussed. (B.O.G.

Scaling of the High Pressure Injection in integral test facilities

Small Break LOCA (SB-LOCA) transients are compared to illustrate and validate a scaling methodology for reduced pressure integral facilities. This methodology is extended to include the analysis of the High Pressure Injection (HPI) boundary conditions. The tests are conducted in the MIST full pressure, full height facility and in the UMCP reduced pressure, reduced height facility. Two main parameters are chosen: the system inventory as a chronological scale and the normalized pressure as the parameter which represents the system behavior. The normalized results presented demonstrate that, for a SB-LOCA where the fluid leaving the system is subcooled, it is possible to scale a full pressure transient from tests conducted in a reduced pressure facility, with great advantages in terms of costs and time of analysis

EBWR core 1A physics analyses /

"Reactor Engineering Division""AEC Research and Development Report""(TID-4500, 16th Ed.)""Reactor Technology"Bibliography: p. 76.Operated by The University of ChicagoMode of access: Internet