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Abstract

Non-equilibrium phase change processes have a significant influence on the thermodynamic behaviour of Pressurized Water Reactor (PWR) cooling systems during off-normal transients. In particular, the injection of subcooled water into a steam voided region can give rise to unstable two-phase flow phenomena induced by direct contact condensation. Such phenomena are of relevance to the transient response of PWR systems, during the emergency core cooling injection period. This paper identifies some condensation driven flow effects observed in the LOBI-MOD2 test facility during various special transient and loss-of-coolant experiments. The extent to which these phenomena can be accounted for in a system calculation with the RELAPS code is discussed, together with suggestions on how modelling of phase change processes may proceed inthe future.

Additional information

Authors: WORTH B, JRC ISPRA ESTAB. (ITALY);ADDABBO C, JRC ISPRA ESTAB. (ITALY);STAEDTKE H JRC ISPRA ESTAB. (ITALY), JRC ISPRA ESTAB. (ITALY)
Bibliographic Reference: EUROPEAN TWO-PHASE FLOW GROUP MEETING, MUENCHEN (GERMANY), JUNE 10-13, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32703 ORA
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