Discharged mass and enthalpy in LOCA for CANDU NPP

Large loss of coolant accident (LOCA) is one of the most limiting accidents in terms of containment environment in CANDU reactors. LOCA assumes pipe break occur in the reactor header which is the largest pipe in primary coolant system. The high enthalpy coolant is discharged into containment from the high pressure primary system and makes the environment of the containment very adverse to equipment in the containment. Also the containment of CANDU is designed to maintain integrity at pressure below 124 kPa(g). Here discharged mass and enthalpy of coolant contributing to harsh environment in containment for typical break positions in large LOCA are considered