Counter-Current Flow Limitation at the Junction Between the Surge Line and the Pressurizer of a PWR
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
F2-1 CHF and Post CHF Heat Transfer, Flooding and CCFL

Takashi Futatsugi (Kobe University)
Toshifumi Nariai (Kobe University)
Kosuke Hayashi (Kobe University)
Akio Tomiyama (Kobe University)
Chihiro Yanagi (Institute of Nuclear Safety System, Inc.)
Michio Murase (Institute of Nuclear Safety System, Inc.)


An experimental study on counter-current flow limitation (CCFL) in vertical pipes is carried out to understand CCFL in the surge line in a PWR. Several upper tanks corresponding to the pressurizer and a lower tank are used to investigate effects of tank geometry and water levels in the tanks on CCFL characteristics. The experimental data clearly show that CCFL depends on the tank geometry and the water level, and therefore, these factors must be taken into account when modelling characteristics of CCFL in vertical pipes.

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