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; Hanai, S.*; Wachi, Y.*; ; ; Hamajima, Takataro*; ; Koizumi, Norikiyo; Ando, Toshinari; Tsuji, Hiroshi; et al.
Teion Kogaku, 33(7), p.485 - 491, 1998/00
no abstracts in English
Wachi, Y.*; Hanai, S.*; ; ; ; Hamajima, Takataro*; ; Nakajima, Hideo; Tsuji, Hiroshi; Shinoda, K.*; et al.
Teion Kogaku, 33(7), p.479 - 484, 1998/00
no abstracts in English
Himeno, Yoshiaki; Morikawa, Satoshi; Kawada, Koji; Yorita, E.*; Fujiwara, T.*; Kaneshige, T.*; Irie, S.*
PNC TN9410 91-092, 11 Pages, 1991/01
To develop a ceramic liner, a selection test of materials, an improvement test of selected material, and a feasibility test of the liner have been conducted.in the selection test, fifty commercially available high temperature cement and ceramics were subjected to thermal shock test (tst), sodium exposure test(set), and sodium flame exposure test (sfet). From test results, alumina/silicon-carbide (Al
O
-sic)mixture base castable refractory was selected in consideration of material cost, and material availability for a simpler liner construction in the buildings. The selected material was subjected to the improvement test. from the test, proper weight fractions of additives such as alumina cement and silica were determined. Drying conditions were also determined. Finally, a sodium burning pan made of concrete whose inner surfaces were covered with the improved AlO-sic base castable refractory was fabricated and was used for a sodium burning test.
Himeno, Yoshiaki*; S.Miyah*; K.Kawat*; Kawabe, Ryuhei*; K.Sasak*; T.Yamad*; K.Miyag*
PNC TN9410 85-130TR, 71 Pages, 1987/06
PNC-TN9410-85-130TR.pdf:7.91MB
A test of sodium fires in an auxiliary building of the fast reactor has been conducted by using a test rig in which reduced scale models of a sodium pipe, a floor liner, a sodium drain pipe, and a smothering tank were installed to simulate the configuration of fire mitigation systems in the reactor. In the test, a 150 kg of sodium at 505
C was spilled from the model sodium pipe at a flow rate of 1 
/sec for 3 minutes. A whole accident sequence that starts from a sodium spill and ends in self-extinguishment of the fire in the smothering tank was then studied. From the test results obtained and through their analysis, the following conclusions were drawn: (1)The whole sodium leak and fires accident sequence proceeded as expected in the Monju design (i.e., spilled sodium was smoothly drained into the smothering tank via the floor liner and the drain pipe, then the sodium fire was self-extinguished in the smothering tank). (2)No failures of the thermal insulation jackets due to sodium corrosion and due to generated sodium combustion heat were found in the model sodium pipe. The thermal insulation jacket kept its original shape and functioned properly as a barrier to prevent the dispersion of spilled sodium into the atmosphere during the test. No flow blockage of spilled sodium occurred either on the floor liner or in the drain pipe. Combustion heat of mixed fires (a columnar fire and a pool fire) that occurred in an accident cell of the test rig was determined to be 1.6 times that of a pool fire. This value is not as large as expected and indicates that mild fires occurred during the test. (3)Temperatures data of sodium, steel liner, perlite concrete, and structural concrete were obtained for the smothering tank. The data for the concrete indicated that the structural concrete was not heated so high as to impair its structural integrity. The total water released from the concretes per unit surface area of the liner during the test was determined ...
T.Morii*; T.Fukuc*; T.Yamad*; Himeno, Yoshiaki*
PNC TN9410 86-124TR, 64 Pages, 1987/05
PNC-TN9410-86-124TR.pdf:3.23MB
On Sept. 27, 1985, a large scale sodium spray fire test (RUN-E1) has been conducted in an air atmosphere using the SOLFA-2 test vessel (100m
made from SUS) of the SAPFIRE facility. The major test conditions are as follows. (Spray Rate : 510 g/sec) (Spray Period : 1800 sec) (Spray Inlet Temperature : 505 C) (Spray Falling Height : 4 m) As a sodium spray started, the gas pressure and temperature rose rapidly and reached to the maximum values 1.24kg/cm
-g and 700C, respectively, after about 1.2 minutes. The oxygen in the test vessel was consumed completely after 4 minutes. From oxygen consumption rate during this time, burning rate of sodium was calculated to be 160g-Na/sec that was equivalent to about 30% of the sodium spray rate (under the assumption of 100% NaO production). Many thermo-couples installed in a spray corn region have been failed due to their exposure to the high temperature above 1000 C, which suggested the existence of a burning zone around the sodium droplets. No remarkable distribution of oxygen concentration was observed in the vertical direction of the vessel during a spray, indicating that the gas within the vessel was well mixed by natural convection due to gas temperature difference between the outside and the inside of a spray corn. Aerosol concentratian has reached the maximum value of 17.5g-Na/m after 5 min and decreased below 1 g-Na/m after 20 min.
