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2 Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

2 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.

Analytical parametric studies on BWR nonlinear dynamics

van der Hagen T. H. J. J., van Bragt D. D. B., Zboray R., Uddin R., de Kruijf W. J. M.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1999

Z. 67

61--70

The main results are presented of parametric studies on the character and magnitude of nonlinear effects on BWR dynamics. Bifurcation analyses are performed on heated coolant channels and on nuclear reactors. Parametric studies are carried out with respect to reactivity feedback strength, cross-sectional void distribution and the axial power profile. Period doublings are encountered at higher-order bifurcations.