[en] The ICECON computer code was developed to provide the post-blowdown pressure transient in a Pressurized Water Reactor (PWR) ice condenser containment during a Loss-of-Coolant Accident (LOCA) as required by Appendix K to 10 CFR 50 for ECCS analysis. The calculated containment pressure is used to determine the backpressure for flow from the primary system to the containment during the refill and reflood portions of the LOCA transient