The performance of the safety systems of a new design of the 1200-MWe simplified boiling water reactor during a large-break, loss-of-coolant accident transient was investigated when one of three passive condenser system failed. The accident considered was a break in the main steam line which is the major design basis accident. The integral test was performed to assess the safety systems and the response of the emergency core cooling systems to accident conditions in a scaled facility called PUMA. The loss of single condenser system did not affect the LOCA transient indicating that the existing safety system will adequately handle the large break LOCA with single condenser failure. The details of the safety system behavior are presented.

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