The core uncovery depends on the RC

The core uncovery depends on the RCS inventory depletion rate (governed by break area) and the rate of hydro-accumulator injection rate. For the case of without HA injection the uncovery depends solely on break area as evident in Table 4. It is very interesting to note here that with available HAs the time required for core uncovery for 150 mm (10,252 s) and 50 mm break (11,584 s) are found to be very close and do not follow a trend as evident for earlier case. It is found that for small break case (50 mm) the injection becomes very low and occasional as the pressure of HA becomes close to RCS pressure. This causes the core to get uncovered prior to exhaustion of total HA inventory (Fig. 6) and a similar uncovery time as observed for 150 mm break case. Fig. 7, Fig. 8 show peak core temperature. As seen from core peak temperature, larger the break size earlier will be core heat up. Fig. 9, Fig. 10show core exit fluid temperatures. There is a sharp rise in-core exit fluid temperature for different break cases with HA injection as compared to cases without HA injection. This can be attributed to higher oxidation for cases with HA injection. The core exit fluid temperature is an important parameter for SAMG.