This paper summarizes the current water hammer simulation capabilities of the CATHENA one-dimensional two-fluid network thermalhydraulics simulation code. The single-phase and one- and two-component two-phase capabilities for simulating void collapse water hammer and water hammer in the presence of noncondensables is discussed. Recent successful efforts to resolve nodalization-dependence observed in the simulation of condensation-induced water hammer are presented along with efforts to develop condensation relationships for simulating condensation-induced water hammer. A summary of current code coupling capabilities is also presented. Possible future efforts to simulate water hammer at supercritical pressures as well as the coupling of CATHENA to piping stress codes are discussed.

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