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Haiyang Unit 1: Passive Containment Cooling Water Storage Tank Set

The passive containment cooling water storage tank (PCCWST) was set at the top of the Unit 1 Shield Building on March 9, 2014.  Its function is to hold the water that will flow by gravity to help cool the containment vessel in the highly unlikely event of an emergency – one of the AP1000 plant’s innovative passive safety systems.