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*; *; *; *; *; *
PNC TJ9124 98-003, 195 Pages, 1998/01
Experiments were carried out to understand burning behavior of a falling liquid sodium drop and to get verification data for an analytical program. The main results of this research were as follows. (1)Design and manufacturing of experimental devices. Devices were designed and manufactured, which generated liquid sodium drops with diameter of 3.5
1.0 mm and with temperature of 500 10
C and dropped them in the atmosphere of inert gas and air. (2)Measurement of liquid sodium drop diameters of the inert gas experiments. Four experiments were conducted, in which 50 drops of liquid sodium were fell into inert gas atmosphere. An averaged diameter of liquid sodium drop was about 3.8 mm. (3)Measurement of burned weight and drop velocity of the air atmosphere experiments. Six experiments were conducted, in which 50 drops of liquid sodium fell into air atmosphere. An averaged burned weight of the liquid sodium drop was about 3.4 mg. The velocity after about 2.4 m drop was evaluated from photographs. Which indicated that the falling velocity of burned and un-burned single liquid sodium drop was 5.5 0.1 m/s.
*; *; *; *; *; *
PNC TJ9124 88-002, 164 Pages, 1988/07
High temperature strength tests were carried out on weld metals of type 308 stainless steel welding materials, and welded joint of type 9Cr steel forging in order to get material data and to demonstrate the integrity of welded joints of the structural materials for the demonstrated LMFBR. Test items for type 308 stainless steel weld metals by Gas Tungsten Arc Welding(GTAW) and by Shielded Metal Arc Welding (SMAW), are tensile test, creep test, creep rupture test, low cycle fatigue test, creep-fatigue test and relaxation test. Test items for welded joint of type 9Cr steel forging by GTAW are tensile test, creep test, creep rupture test and creep crack propagation behavior test. As the results of each test, material properties of each weld metal and welded joint were clarified as follows. (1)0.2% off-set yield strength of type 308 stainless steel weld metal by GTAW and SMAW at room temperature, 450C, 500C, 550C and 600C is much higher than that of base metal, and tensile strength at each temperature is equivalent to that of base metal. Creep strength at 500C, 550C and 600C is equivalent to the best fit curve of base metal. Low cycle fatigue strength at 500C and 550C is equivalent to that of base metal. Additionally relaxation properties at 500C and 550C were clarified. These obtained results show that material properties of type 308 stainless steel weld metals by GTAW and SMAW satisfy with each strength value of base metal by "High Temperature Structure Design Standard for LMFBR, Material Standard". (2)As the results of tensile tests for welded joint of Mod.9Cr-1Mo steel forging by GTAW, tensile strength of weld metal is equivalent to existing data and tensile strength of welded joint is equivalent to that of base metal at room temperature, 450C, 500C and 550C. Creep strength of weld metal and welded joint at ...
Sawada, Shusaku*; *; *
PNC TJ9124 88-007, 173 Pages, 1988/05
Following functions have been added to HIBEACON which is a three dimensional core deformation analysis code for experimental fast reactor "JOYO", in order to improve the functions for evaluation of core deformation behavior and calculational accuracy of the code. (1)Calculational model for frictional force at contact points between wrappers. (2)Function to assign swelling and creeping equations to each core element's type. The Characteristics of this code are as follows, (i)Sliding events and sticking events in the frictional phenomenon can be calculated with HIBEACON's characteristic being kept, which is to decompose a core element's displacement into components in three directions. (ii)It's supposed that a sliding event proceeds in quasi-static and a static frictional force at end of a sliding event is equal to a dynamic frictional force just before the end. (iii)The frictional force at a sticking event can be treated as an internal force in a contact point with the condition that there is no relative displacement between two assemblies which contact each other through a sticking contact point. (iv)Damping method is adopted at the process of frictional force calculation in order to stabilize a solution of frictional force in sliding event. (v)A calculational method of repetition is adopted at the process of frictional force calculation. The results during repetition can be obtained in the form of output lists and plotter at option. (vi)Swelling and creeping equations can be assigned to each core element's type and the maximum number of core element's types has been increased from six to fifteen. (vii)Core deformation behavior at several points of the process of power descent can be calculated as well as the process of power ascent. The example-4, which is one of the benchmark problems submitted by IAEA/IWGFR, is calculated with this modified code. Following results on the influence of friction to deformation behavior has been obtained, (i)The ...
Sawada, Shusaku*; *; *
PNC TJ9124 88-006, 80 Pages, 1988/05
Following Functions have been added to HIBEACON which is a three dimensional core deformation analysis code for experimental fast reactor "JOYO", in order to improve output file compilation. (1)Function to calculate and output core element's axial distortion. The function to calculate and output core element's axial distortion due to thermal and swelling expansion has been added to HIBEACON. (2)Function to calculate and output force to pull core element from core. The function to calculate and output force to pull core element from core has been added. The force, which is required initially when a core element is pulled from core, is calculated using contact forces at load pads, upper and lower parts of entrance nozzle and coefficients of friction.
*; *; Sukekawa, Masayuki*; *
PNC TJ9124 88-001, 103 Pages, 1988/04
Strength tests of SUS304 stainless steel welded joint and Mod.9Cr-1Mo forging base metal at elevated temperature were carried out for the purpose of getting data needed for prototype Fast Breeder Reactor and Demonstration plant. Same as last year's, examined materials were welded joints of SUS304 plate (40t) and SUS304 forging (350t). For base metal test, Mod.9Cr-1Mo forging (550t) were applied. Creep test, bending creep and fatigue test of welded joint of SUS304 plate and SUS304 forging, and creep test of weld metal were carried out. Tensile test, creep test and fatigue test of Mod.9Cr-1Mo forging were carried out. Results of these tests are as follows. (1)308 weld metal and welded joint of 304 plate and forging show that their creep strength are higher than those of Material Strength Standard, PNC. (2)Bending creep fatigue strength of welded joint of plate and forging are a little higher than those strength on axial load at 500C and are a considerable higher than those at 500C. (3)Tensile strength, creep strength and fatigue strength of Mod.9Cr-1Mo forging steel are same as Material Strength Standard, PNC (preliminary). And there are no significant difference between two data of surface and middle of forging.
