None

Nagato, Kotaro*; *; Yano, Kazutaka*; *; Maekawa, I.*; *

PNC TJ9055 96-003, 130 Pages, 1996/03

PNC-TJ9055-96-003.pdf:3.15MB

None

Dynamic response of a containment surrounding extreme pressure source due to steam explosion

*; *; Maruyama, Yu; Yamano, N.; Sugimoto, Jun

Transactions of 13th International Conference on Structural Mechanics in Reactor Technology (SMiRT-13), 4, p.359 - 370, 1995/00

no abstracts in English

High-speed tensile tests on the material for the capsule in the shock structural tests

Tanzawa, Sadamitsu; ; *; *

JAERI-M 90-186, 12 Pages, 1990/10

JAERI-M-90-186.pdf:0.6MB

no abstracts in English

Pressure wave propagation tests simulating sodium-water reaction accidents using slow explosives Phase (II)

*; *; *; Yano, Kazutaka*

PNC TJ9055 89-002, 149 Pages, 1989/10

PNC-TJ9055-89-002.pdf:3.56MB

The present tests have been conducted in taking note of double rupture disc's behavior to evaluate characteristics of the disc opening and pressure wave propagation way when an initial spike pressure is generated in the no cover-gas type steam generator of the secondary coolant system under the sodium-water reaction. Another objective is to get the data useful for verification of analytical codes. In the experiments, the initial spike pressure is simulated by an underwater explosion of a slow burning explosive which is set in the steam generator model of the water loop equipment (PEPT) as well as Phase (I) tests. The following burst characteristics are identified by the high-speed photographing of the jetting water and the rupture discs with synchronization ; In the case of the source pressure of about 30 kg/cmg at peak with 20 ms in width at the central position in axial direction of the steam generator, the jetting water moves out at about 50 m/s in the air plenum between the double rupture discs after the first disc bursting. Though the air is compressed according to the jetting water, the second rupture disc is ruptured by the water hammer of the splash which passes firster than the main flow part at 2.5 kg/cmg as the air does not reach the set burst pressure of the disc(5 kg/cmg). The tests have been also executed under the parameter such as the location of the rupture disc or disc types and each characteristics were experimentally grasped. These data can be used for the analytical code verification.

Pressure wave propagation tests simulating sodium-water reaction accidents by using slow explosives

*; *; *

PNC TJ9055 88-003VOL1, 89 Pages, 1988/08

PNC-TJ9055-88-003VOL1.pdf:2.51MB

The present tests have been executed for simulating an initial pressure spike of sodium-water reactions in a secondary coolant system with no cover-gas type steam generators and for grasping burst characteristics of rupture discs and diminution effects of propagated pressure waves. The tests have been performed by using slow-explosives to simulate the initial pressure spike under water instead of sodium in the 1/5-scaled down secondary coolant system model of a Large Scale Fast Breeder Reactor. The high-speed photographing indicated that the rupture disc became to deform by the initial pressure spike propagated at about 1300 m/s, to jet water after buckling in 1.1 msec later, to split to 4 parts in 1.7 msec, and to be perfectly opened itself in about 4 msec. About 30 percent of the pressure diminution was shown for the propagated pressure wave in the discharge piping by the burst behavior of the rupture disc. After the disc was burst, however, the pressure wave held in the discharge piping and the duration time was the same as that of the reaction point in the steam generator. For the first time, the burst characteristics of rupture discs were identified and the diminution effect was evaluated by the tests. These data are useful for verification of analytical codes of sodium-water reaction.