INSTABILITIES IN A PASSIVE MODERATOR COOLING SYSTEM OF SCWR CANDU
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16


Presented at:
The 5th International Symposium on SuperCritical Water-cooled Reactors
2011 March 13-16
Location:
Vancouver,Canada
Session Title:
Instability Analyses (II)

Authors:
Sun-Kyu Yang (Atomic Energy of Canada Limited)
  

Abstract

This paper presents the results from the examination of instability mechanisms in a Passive Moderator Cooling System of a SCWR (SuperCritical Water-cooled Reactor) - CANDU®. Such a passive system is being developed at AECL using a flashing-driven natural circulation loop. Unstable intermittent and sinusoidal oscillations were identified from available data of the flashing-driven natural circulation in a passive moderator cooling system. The oscillation periods were correlated with the boiling delay time. A stability map was established from available natural circulation test data in the Calandria Subcooling-Power plane, and depicted boundaries between the stable and unstable areas.

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