An integrated chemical effects test was designed and executed to investigate the corrosion of materials in a hypothetical post-Loss of Coolant Accident (LOCA) environment for Pressurized Water Reactors (PWRs) and the resulting effects on the measured head loss in three vertical columns through multi-constituents debris beds. The head loss columns were isolated approximately after 72 hours, as the measured head loss in all three columns approached or surpassed the maximum limit of the differential pressure (DP) cells. The test continued thereafter up to 30 days as an integrated chemical effects test using the corrosion tank only similar to identical test carried out previously under the same conditions known as chemical head loss experiment (CHLE) - T6.
The results presented in this article demonstrate trends for zinc, aluminum, and calcium release that are consistent with separate bench scale testing and previous integrated tests conducted under tri-sodium phosphate (TSP)-buffered post-LOCA environmental conditions. In general, the total and filtered samples showed almost identical concentration of all metals (Al, Ca, Si, and Mg) except zinc which clearly indicate that no precipitation occurred. The release rate and maximum concentrations of the released materials were slightly different than the separate effect testing as a result of different experimental conditions (temperature, surface area-to-water volume ratio) and/or the presence of other metals and chemicals in the integrated test. Samples of metal coupons and fiberglass were selected for analysis using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS).