Special Effects

Special effects, such as Wigner energy release [A cxp(BT)(dT/dt)] in graphite structure systems or uranium oxidation [а ехр(бТ’)] in metal — fueled systems, may have to be included in safety studies when adverse conditions are studied. However in sodium-cooled systems extra power production terms do not arise except when fuel is supposed to be ejected into the coolant channel. Then the coolant equation contains an extra heat production term. However, then it is also necessary to represent channel boiling (Section 1.3.4).