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1 Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1 1999

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Circus, an experimental facility to study the impact of flashing on the stability of a natural circulation BWR

de Kruijf W. J. M., van Bragt D. D. B., van der Haggen T. H. J. J., Mudde R. F.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1999

Z. 67

275--282

The stability of a natural circulation Boiling Water Reactor (BWR) under low-power low-pressure conditions is studied. For low pressure, the so-called flashing phenomenon plays an important role. It is shown that an extra dimensionless parameter, the flashing number, is needed to describe the stability of a natural circulation reactor in the dimensionless operational map. As pressure decreases the range in which the reactor is unstable with respect to so-called type-I instabilities broadens. The experimental facility CIRCUS has been built to study the stability of a natural circulation reactor under low-power low-pressure conditions. First test results show flashing induced oscillations, with the oscillation period governed by the loop circulation time.