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- W157179617 abstract "Presented at International Atomic Energy Agency Symposium on Reactor Safety and Hazards Evaluation Techniques, Vienna, May 14--18, 1962. Safety in reactor operations is achieved through review and development of reactor control systems together with the exercise of sound administration controls. At Chalk River, the control and safety systems of the NRX reactor were developed over the 14-year history of the reactor to provide safer and more reliable operation. The original 18 boron carbide shut-off rods were replaced by 6 electrically operated rods of greater reliability. To augment this change an automatic dump of the heavy water moderator was included. Both devices function simultaneously but each is capable of shuttlng down the reactor independently. Control of reactor power was initially maintained through two manually operated devices; a cadmium control rod and an overflow weir by which the moderator level was adjusted. Later, automatic control of the cadmium rod was possible during power operation. Now, automatic start-up and power control is achieved by adjustment of the moderator level, eliminating the control rod and the weir. Incorporation of a two out of three coincidence system further improved the safety of the reactor. To assist in training, manuals and policy instructions are used. Thesemore » form the basis for the operation and are augmented by the control procedures. Field work is controlled by work permits, entry to limited access areas through interlock systems and operation of valves through valve slips and flowsheets. Where feasible check-off systems are used to verify field operations. Scheduled checks made possible at power by the two out of three coincidence system permit a continual assessment of the reactor systems. When associated with well established maintenance procedures, they enhance the reliability and safety of the reactor. (auth)« less" @default.
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- W157179617 date "1962-04-01" @default.
- W157179617 modified "2023-09-27" @default.
- W157179617 title "CONTROL AND SAFETY IN THE OPERATION OF THE NRX AND NRU REACTORS" @default.
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