Experimental data report for Test TS-4. Reactivity Initiated Accident test in the NSRR with pre-irradiated BWR fuel rod

摘要

This report presents experimental data for Test TS-4 which was the fourth test in a series of Reactivity Initiated Accident (RIA) test using pre-irradiated BWR fuel rods, performed in the Nuclear Safety Research Reactor (NSRR) in January, 1991. Test fuel rod used in the Test TS-4 was a short-sized BWR (7x7) type rod which was re-fabricated from a commercial rod irradiated in the Tsuruga Unit 1 power reactor of Japan Atomic Power Co. The fuel had an initial enrichment of 2.79% and a burnup of 26GWd/tU. A pulse irradiation of the test fuel rod was performed under a cooling condition of stagnant water at atmospheric pressure and at ambient temperature which simulated a BWR's cold start-up RIA event. The nominal energy deposition of 110(+-)5 cal/g(center dot)fuel (89(+-)4 cal/g(center dot)fuel) in peak fuel enthalpy) was subjected to the test fuel rod and no fuel failure was observed in the test. Descriptions on test conditions, test procedures, transient behavior of the test rod during the pulse irradiation, and results of pre-pulse and post-pulse irradiation examinations are described in this report. (author). (ERA citation 19:021611)