Mark II containment 1/6-scale pressure suppression test program: data report no. 3

This report documents results of the Fourier-analysis applied to the pressure oscillations measured during the steam condensation tests, performed in the first test phase of the Mark II Containment 1/6-Scale Pressure Suppression Test. The 1/6-Scale Test was initiated to investigate the thermohydraulic responses of a BWR Mark II pressure suppression system during a postulated LOCA, by means of scale model experiments. From January to June, 1977, a series of tests, including twelve steam condensation tests, were performed for the Japanese BWR Owners' Group. During the steam condensation tests, pressure oscillations associated with unsteady steam condensation were measured, and these data were Fourier-analyzed by a digital computer program. The evaluated quantities are power spectral density (PSD) functions, cross power spectral density (CPSD) functions, phase angles and coherence functions. These results are presented with qualitative interpretations and comparison with other test results. (author)