Anticipated and Abnormal Plant Transients in Light Water by Joseph M. Hendrie (auth.), Pamela L. Lassahn, Debu Majumdar,

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By Joseph M. Hendrie (auth.), Pamela L. Lassahn, Debu Majumdar, George F. Brockett (eds.)

Over the final 30 years, reactor protection expertise has advanced now not rather a lot from a necessity to get over injuries or incidents, yet essentially from many teams within the nuclear group asking hypo­ thetical, looking (what if) ~uestions. This ~uestioning has certainly paid off in developing preventive measures for plenty of kinds of occasions and strength injuries. stipulations, corresponding to reactivity tours, huge holiday, lack of coolant, middle soften, and include­ ment integrity loss, to call a number of, have been all at one time subject matters of protracted discussions on hypothesized occasions. traditionally, lots of those became multiyear, large-scale learn courses aimed toward resolving the "what ifs. " For the subject of expected and irregular plant transients, how­ ever, the looking out ~uestions and the study weren't so prolific till the mid-1970s. at the moment, probabilistic probability methodolo­ gies started to let us know we must always swap our emphasis in reactor security learn and improvement and concentration extra on small pipe breaks and plant transients. 3 Mile Island punctuated that message in 1979. The plant temporary subject quarter is a multidisciplinary topic related to not just the nuclear, fluid stream, and warmth move applied sciences, but in addition the synergistics of those with the reactor regulate platforms, the protection s;,"stems, operator activities, upkeep or even administration and the industrial issues of a given plant.

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We need to keep working on the symptom-based emergency operating procedures and on shift crew training, particularly on plantspecific simulators with improved capability. We need to improve the computer-based plant safety status displays now under development and the built-in computational and analytical capabilities of these systems to collect and correlate the information available in plant computers and to present it in improved formats. We need to develop further the concept of transient management as a function of senior people on shift who have special training in assessing overall plant status in off-normal conditions and in planning the best course to recover the plant to normal conditions.

First, there is always the possibility that a transient may occur which has not been thought of yet. Second, and most important, is the concern that a transient in one category can be moved or shifted to a more frequent category and, thus, provide challenges to the operator and equipment for which they are not prepared to cope. It is with this second area that the major concern lies. The operational transients experienced during the life of a plant are in many cases precursors or initiating events for more severe accidents.

That is a very good thing for successful transient management and I look forward to the implementation of these systems on operating plants. I hope I do not have to wait much longer for general implementation of these systems. They have been developed far enough so that operating plants can begin to place orders, and I encourage that order-placing to start. A caution is in order here. As the system designs become more sophisticated, there may be a tendency for them to become more engineer-directed than operator-directed.

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