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; ; Yamada, Takeshi; ; ; ; Kaito, Yasuaki; ; Kotaka, Yoshinori; ; et al.
PNC TN2410 96-005, 339 Pages, 1996/03
Construction of the 'Monju' fuel handling systems was completed in April, 1992. From March 1991 to August 1992, pre-commissioning tests were carried out. In December 1992, all the systems of Monju were transfered to PNC, and commissioning tests and reactor physics tests, were started. For the first time, during these physics tests, the fuel handling systems were operated for one of the commissioning tests 'Loading to Criticality', without significant problems. 168 fuel sub-assemblies were loaded into the core and the first criticality was achieved on 5th April 1994. The fuel handling systems continued in operation for the 'Loading to Full Size of the Core', power distribution test and for cleaning discharged dummy sub-assemblies. To keep these fuel handling systems working somothly and satisfactorily annual maintenance has been carried out since 1992. This paper describes the operation and maintenance experience of fuel handling systems after the pre-commissioning tests and future study items for system reliability improvement.
*; *; *; *; Muramatsu, Toshiharu; Sekiguchi, Yoshiyuki*
PNC TN941 79-127, 236 Pages, 1978/12
A plant stability test of JOYO has been conducted in the period of JOYO Power Up Test. The plant stability test consists of two kinds of tests. One is a test of changing set point of DHX (Dump Heat Exchanger) outlet sodium temp. (PT-22), and the other is a small reactivity disturbance test (PT-21). In JOYO, reactor inlet sodium temperature is kept constant (370C) by a coolant temperature controller, which is provided for each DHX (Each loop has two DHXs). The plant stability test has been conducted at the reactor power levels of = 20MW, 25MW, 40MW, 50MW, and the test results are as follows ; (1)The plant is sufficiently stable for set point change of DHX outlet sodium temperature through the reactor power range, and damping ratio of main response variables are less than 0.25 (aiming value as design) for sub-optimal controller's parameter. (2)The plant is also sufficiently stable for small reactivity disturbances of 3cent 5cent, and main response variables change monotomously even if the coolant temperature controllers are manual condition.