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; ; Ueno, Fumiyoshi; ; ; ;
JNC TN2400 2000-005, 103 Pages, 2000/12
JNC-TN2400-2000-005.pdf:3.98MB
Inelastic analyses of the floor liner subjected to thermal loading due to sodium leakage and combustion were carried out, considering thinning of the liner plate due to molten salt type corrosion. Because the inelastic strain obtained by the analyses stayed below the ductility limit of the material, mechanical integrity, i.e., there exist no through-wall crack on the floor liner, was confirmed. Partial structural model tests were conducted, with a band of local thinning of the liner plate. Displacements were controlled to give specimens much larger strains than those obtained by the inelastic analyses above. No through-wall crack was observed by these tests. Mechanical integrity of the floor liner was confirmed by these results of the inelastic analyses and the partial structural model tests.
Kihara, Shinji; Yahata, Taneaki; *; ; *; ; ; *
JAERI-Research 97-037, 43 Pages, 1997/05
JAERI-Research-97-037.pdf:1.85MB
no abstracts in English
Kawada, Koji; Ohno, Shuji; Miyake, Osamu; ; ; Tanabe, Hiromi
PNC TN9410 97-036, 243 Pages, 1997/01
As a part of the work for investigating the sodium leak accident which occurred in Monju on December 8, 1995, three tests, (1)sodium leak test, (2)sodium leak and fire test-I, and (3)sodium leak and fire test-II, were carried out at OEC/PNC. Main objectives of these tests are to confirm leak and burning behavior of sodium from the damaged thermometer, and effects of the sodium fire on integrity of the surrounding structure, etc. This report describes the result of the sodium fire test-I carried out as a preliminary test. The test was performed using SOLFA-2 (Sodium Leak, Fire and Aerosol) facility on April 8, 1996. In this test, sodium heated to 480
C was leaked for approximately 1.5 hours from a leak simulated apparatus and caused to drop onto a ventilation duct and a grating with the same dimensions and layout as those in Monju. The main conclusions obtained from the test are shown as below. (1)Observation from video cameras in the test revealed that in early stages of sodium leak, sodium dropped down out of the flexible tube of thermometer in drips. This dripping and burning were expanded in range as sodium splashed on the duct. (2)No damage to the duct itself was detected. However, the aluminum louver frame of the ventilation duct's lower inlet was damaged: Its machine screws had come off, leaving half of the grill (on the grating side) detached. (3)No large hole, like one seen at Monju, were found when the grating was removed from the testing system for inspection, although the area centered on the point that the sodium attacked was damaged in a way indicating the first stages of grating failure: The 5-mm- square lattice was corroded through in some parts, and many blades (originally 3.2 mm thick) had become like the blade of a sharp knife. (4)The burning pan underside thermocouple near the leak point measured 700C in roughly 10 minutes, and for the next hour remained stable between 740C and 770C. There was a ...
Aoto, Kazumi; ; Hirakawa, Yasushi
PNC TN9410 97-055, 128 Pages, 1996/07
Several material analyses on damage of the floor liner made of a mild steel which was in the test cell of the second sodium leak and combustion experiment (Test-2) performed in OEC/PNC on June 7 in 1996 were carried out to clarify the following issues. (1)Difference of the corrosion mechanism of Test-2 liner to that of the first sodium leak and combustion experiment(Test-1) liner. (2)The vital factor which can desides corrosion mechanism and damage location. The following analyses were accomplished. (a)Microstructure observation (b)EPMA for cross-section of vicinity of corroded area (c)X-ray diffraction(XRD) for the interface between corrosion product-liner(mild steel) The differences between the corrosion mechanism of Test-1 liner which is seemed to be the same that of "MONJU" liner and that of Test-2 liner is discussed based on the results of these material analyses. As the result, the Na-Fe double oxidization with mechanical/chemical removal of reaction product can be occurred on the Test-1 and "MONJU" liner. On the other hand, a hot-corrosion, taht is the molten salt type corrosion is subject to be thinning of the Test-2 liner. All failures of Test-2 liner surround at the halfway up a convex. Considering the above corrosion mechanism, that fact leads that significant damage is occurred at the molten salt level.
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.
Morii, Tadashi*; *; *
PNC TN9410 86-124, 61 Pages, 1986/12
PNC-TN9410-86-124.pdf:3.08MBPNC-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.
Kawabe, Ryuhei*; Himeno, Yoshiaki; Kawada, Koji*; Miyaguchi, Kimihide
PNC TN941 85-104, 17 Pages, 1985/06
Flow and combustion test of low temperature sodium (250C) on a simulated for liner has been conducted to give an answer to the possible flow blockage or flow plugging. The simulated floor liner used for this purpose was 2.4m in length and 1.2m in width having liner gradient of l/100. The bottom surface of the liner was well thermally insulated. In the test, 160kg of sodium was slowly spilled from a nozzle having a wide opening at flow rate of 1 
/sec for 200 sec. The nozzle was attached to the side of the liner. Flow pattern and combustion characteristics of sodium have been monitored during the test, and temperatures of the flowing sodium and a liner steel have also been measured. In the post-test examinations, distribution of residual sodium and sodium oxide on the floor liner as well as that in a drain pipe was determined. The results thus obtained were summarized as follows. (1)At beginning of the test, although the spilled sodium froze for a certain period of time due to its heat transfer to the liner, it remelted by taking heat from a successive flowing sodium at higher temperature. Therefore, on the liner sodium flowed continuously without being blocked its flow path. (2)Heat flux from sodium to the liner was less than 80kw/m, while related heat transfer coefficient was 300 
500w/mC. The latter value was almost the same to that obtained from the similar test with hot sodium (505C). (3)Post-test examination revealed that the distribution of residual sodium and sodium oxide on the floor liner was almost uniform with the average value of 1kg/m. No massive combustion products that may cause flow plugging was found in a sodium drain pipe.
; *
PNC TN241 83-10, 229 Pages, 1983/07
Sodium spray fire experiments using a 21 m vessel were Performed in order to validate the computer code SPRAY-III. The results of precalculations has been reported in a preceding report, Sodium Spray Fire Analysis. In this study, the validation of SPRAY-III was conducted using the experimental results and the accuracy of calculated results was discussed. The following results were obtained: (1)study under inert gas atmosphere. (a)The peak pressure and temperature obtained by the analysis overestimate the experimental results. But the calculated pressure rose monotonically till the termination of spray injection and it was different from the experimental peak which appeared during the injection. The rise rates of pressure and temperature in analyses were lower than those in experiments. (b)The calculated temperatures of the steel wall liner were only about 55 to 75 % of the experimental values at the end of sodium injection. But the comparison between analysis and experiment with regard to the temperature of mortar wall showed a fairly good agreement. (c)The averaged pool temperature at the end of sodium injection was found to be slightly lower in analysis than in experiment. The analysis shows that the heat transfer between the pool and the gases hardly affects the results during sodium injection. (2)Study under air atmosphere. (a)When all reaction products were assumed to be peroxide in the same manner as in the safety analysis of Monju, the increase rates of both the pressure and the temperature as well as their peak values were found to be underestimation. Hence to obtain conservative results in this 21 m vessel, an increase in the rate constant of reaction with oxygen (Vo from 300 to 1000 ft/sec) must be assumed. However, this value should be investigated in the near future for application to the safety analysis of Monju. (b)The comparison between analysis and experiment with regard to the temperature of the mortar showed a fairly good agreement. ..
PNC TJ222 82-16VOL1, 178 Pages, 1982/12
PNC-TJ222-82-16VOL1.pdf:7.15MBPNC-TJ222-82-16VOL1TR.pdf:5.65MB
no abstracts in English
Kuriyama, Isamu; Hayakawa, Naohiro;
JAERI-M 6751, 43 Pages, 1976/10
no abstracts in English
Kuriyama, Isamu; *; *; *; *
Hitachi Hyoron, 58(3), p.247 - 252, 1976/03
no abstracts in English
Kawasaki, Kohei; Shinada, Kenta; Makino, Takayoshi; Okamoto, Naritoshi
no journal, ,
no abstracts in English
