Preliminary analysis of sodium-water reaction under high pressure

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PNC TN9410 94-093, 52 Pages, 1994/05

PNC-TN9410-94-093.pdf:1.41MB

Sodium-water reaction under the high pressure condition of several hundred times of atmospheric pressure was analysed based on the occurence assumption of a hypothetical sea water leakage accident through a pressure hull with the rupture of a bellows type accumulator concerning a deep sea reactor. The sodium-water reaction analysis code of SWACS/REG4 was used in the analysis. The basic calculation case of the analysis adopted the water leakage rate of 0.128 kg/s by considering the accumulator rupture time of 1 s and the water leakage rate used in the heat transfer pipe rupture accident analyses of FBR heat exchangers which had been performed by the code. The calculational result clarified no existence of pressure wave in the upper plenum of a reactor vessel, which was due to the attenuation of the wave in the long slender pipe of 1.5 m in length and 2 cm in inner diameter between the accumulater rupture point and the reactor vesssel. In the analysis, survey calculations were also performed by changing the parameter values of the pressure, the water leakage rate and the gas space volume remaining in the pressure hull.