沸騰水型原子炉における飛沫除去

抄録

Experiments of steam separation have been made to analyse the phenomena of moisture entrainment into steam from the steam-water mixture in steam generators, such as boiling water reactors (BWR) and conventional shell and tube type steam generators. The height from the boiling surface to the steam outlet, the steam velocity above the boiling surface and the pressure in the steam generator, these three factors are considered as the most important ones with respect to the amount of moisture entrainment. Some clear correlations between the entrainment and these three factors have been found from the test results, in which the pressure was varied from 1 to 70 ata, the steam velocity up to 2.0 m/sec and the height up to 120 cm. The performances of corrugated plate type steam scrubbers have also been tested at atmospheric pressure. The following facts have been confirmed from the test results and the theoretical analysis based on some assumptions.
(1) The steam quality was almost independent of the height from the boiling surface to the steam outlet when the height is more than 60 cm.
(2) The steam quality was more deteriorated at the higher pressure.
However, the quality, at least 99.9%, was obtained at the pressure of 70 ata.