Pre-operational tests



 A pre-operational test operation of the reactor cooling system was performed from May 1996 to March 1998. At the stage of the pre-operational test without nuclear heating and with dummy fuel blocks, the helium gas was heated by the gas circulators up to about 200°C at 2MPa. Pre-operational tests of the cooling system were performed at this operation condition to accumulate operational experiences. Plant control systems were fully checked. During the pre-operational tests, several improvements in the system were made in terms of securing its safety margin and easy operation. Their performance was finally confirmed in July 1999 after completing the actual fuel loading.



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