"JOYO" Start-up test report; PT-12 Heat transfer characteristics of IHX and DHX

Nanashima, Takeshi*; Endo, Masayuki*; Enomoto, Toshihiko*; Hirose, Tadashi*; Yamamoto, Hisashi*

The purpose of this test is to confirm that the heat transfer characteristics of the intermediate heat exchangers (IHX) and dump heat exchanger (DHX) satisfy the design values. Each primary and secondary heat transport system has two loops (A&B) and each has an IHX. Each secondary loop has two DHX's (a total of 4 ). However, only one DHX (unit 2B) is instrumented to provide the required test data. The IHX/DHX heat transfer characteristics are measured under steady-state operating conditions at least four times (at 15, 25, 40 and 50 MWt). Test results : (1) The heat transfer coefficient for the A-loop IHX is approximately 60% of the expected value. The B-loop IHX value is approx 120% of expected. (2) The DHX 2B air-side heat transfer coefficients measured in the range of 25 to 50 MWt (Reactor power) closely mateh predicted values. The pressure drop in the DHX air flow duct based on measured blower outlet pressure is less than the predicted value.