29th Symposium on Fusion Technology (SOFT 2016)

P2.202 Simulation experiment on pressure shock waves under blanket in-box LOCA

6 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 202

Poster J. Power Plants Safety and Environment, Socio-Economics and Technology Transfer P2 Poster session

Speaker

Danna Zhou (Institute of Nuclear Energy Safety Technology)

Description

The helium cooled LiPb blanket concept has become a promising design for fusion reactors in the world. Considering the complex design of the blanket, it is likely that helium gas leakage into the liquid alloy may occur due to tube rupture, named in-box Loss of Coolant Accident (in-box LOCA). And corresponding shock waves likely occurred at the break position and transferred within the liquid metal, causing the sudden pressure jump into LiPb metal. It will raise the great challenge to the integrity of the blanket. A Chinese multi-functional liquid metal experimental platform safety test loop (KYLIN-II S) was constructed to investigate the interaction between gas and LiPb for in-box LOCA. The facility consists of a reaction vessel, gas tank and a safety tank. During the gas injection into the reaction vessel, the high precision piezometric pressure transducers placed on the vessel wall were used to measure dynamic pressure in gas and liquid metal. The preliminary jet experiment was performed by using air (helium substitute) inject into water (LiPb substitute) to investigate the pressure characteristics for two-pressure model of two-phase flow verification and validation. By changing the inlet air pressure (1MPa, 2MPa, 4MPa, 6MPa, 8MPa) and cover gas volume fraction (10%, 20%, and 30%),the gas injecting into water experimental results have shown that a first sharp pressure peak appeared due to “gas hammer” and the value of the first peak increased with the decreasing of cover gas volume fraction. The experimental and the calculated results showed a good agreement.