Abstract
Tests on the performance of the JEFR safety rod drive mechanism were conducted with water flow simulating the specified sodium environment. Results obtained during 400 cyclic endurance tests show that the scram period of the safety rod passing through the core from scram initiation to 600mm displacement is 525 msec during the initial stages of test and 560 msec during final.To provide a means of predicting and analyzing the scram characteristics, a computer code was derived from the results of these tests. This report describes the code, and presents an analysis performed there with on the scram characteristics of the safety rod drive mechanism, and on the effects of acceleration spring and coolant flow rate on the scram period The main points are as follows:(1) The scram period is 6% shorter in sodium environment than in water due to the difference in density.(2) A spring force of 2-3 times the gravity of the safety rod is effective in shortening the scram period.(3) When the coolant velocity is designed to be much smaller than the mean velocity of the safety rod passing through the core, coolant flow rate would not influence the scram period to any extent.
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