In Vessel Retention (IVR) is an important severe accident management strategy and the critical heat flux (CHF) is an important factor for the reliability of the IVR. CHF refers to the heat flux that occurs before a boiling crisis with a sudden jump in surface temperature or a sharp deterioration in heat transfer rate.

In this paper, a small scale pool boiling facility is established to investigate the heat transfer coefficients of the downward facing surface under different water quality (including deionized water, tap water and seawater). Steady-state experiments were performed to research the effects of cooling water quality on the heat transfer coefficient.

The pool boiling experiments are finished under different power input with three kinds of fluid. The results show that: 1) There was an obvious boiling conversion process between deionized water and tap water, while there was no obvious boiling conversion process in seawater and the heat flux was significantly higher than the others. 2) After the experiment in seawater, the surface of the experimental section changed obviously due to the scale formation of seawater.

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