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With regard to the cementation of the evaporator concentrate from pressurized water reactors, this study identifies the operating conditions giving properly coherent waste forms of a high volume reduction factor, high compressive strength, and good workability without the development of freestanding water. Simulated waste specimens prepared by varying the mixing ratios of simulated borate waste [boric acid (H3BO3) 12% by weight, pH 9], Portland cement, and slaked lime were tested. The results appear in a three-phase diagram depicting the proper blending necessary to yield final products possessing a compressive strength of over 15 MPa and a volume reduction factor above 0.65.
The solubility of sodium borate is higher than that of H3BO3, and cementation of a concentrated borate solution (24 wt% H3BO3, pH 9) was therefore also tested. The region of over 15 MPa of compressive strength with a volume reduction factor of over 0.6 based on the waste volume was identified. By increasing the H3BO3 concentration in the waste from 12 to 24 wt%, the actual volume was reduced by an additional factor of about two.
boric acid, pressurized water reactor, cementation, slaked lime, borate waste
Head, Korea Atomic Energy Research Institute, Taejon,
Principal researcher, Korea Atomic Energy Research Institute, Taejon,
Director, Korea Atomic Energy Research Institute, Taejon,
Vice-president, Korea Atomic Energy Research Institute, Taejon,