Natural Circulation Flow Behavior at Reduced Inventory Conditions
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
E7-1 Natural Circulation Phenomena and Passive Safety Systems

Parimal Kulkarni (Bhabha Atomic Research Centre)
Arun Kumar Nayak (Bhabha Atomic Research Centre)
Pallipattu Krishnan Vijayan (Bhabha Atomic Research Centre)
Dilip Saha (Bhabha Atomic Research Centre)


The flow instability behaviour of a natural circulation loop was studied at reduced inventory conditions, which is important during a LOCA situation in a nuclear reactor with non-availability of circulating pumps. For this, experiments were conducted at low steam drum levels. Large amplitude U-tube type oscillations were observed at low power condition when the system was mostly under single-phase condition. With rise in power when boiling was initiated in the loop, low quality Type I density-wave instabilities were observed. The characteristics of Type I instabilities are found to be quite different from the oscillations observed under single-phase conditions.

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