Relocation work of temporary thermocouples for measuring the vessel cooling system in the safety demonstration test

Shimazaki, Yosuke ; Shinohara, Masanori ; Ono, Masato ; Yanagi, Shunki; Tochio, Daisuke ; Iigaki, Kazuhiko 

It is necessary to confirm that the temperature of water cooling panel of the vessel cooling system (VCS) is controlled under the allowable working temperature during the safety demonstration test because the water cooling panel temperature rises due to stop of cooling water circulation pumps. Therefore, several temporary thermocouples are relocated to the side cooling panel outlet ring header of VCS and the water cooling panel near the stabilizers of RPV in order to observe the temperature change of VCS. The relocated thermocouples can measure the temperature change with starting of the water circulation pumps of VCS. So it is confirmed that the relocated thermocouples can observe the VCS temperature change in the safety demonstration test.