Emergency conditions integrated plants

Emergency Conditions in Integrated Plants - In integrated plants, a process upset in one unit may have an effect on other units (e.g., loss of flow of a pumparound which is used as a source of heat for reboiling other towers). All possibilities such as these must be carefiiUy considered and the potential for resulting overpressure evaluated. 

The Paks Nuclear Power Plant (NPP) experience with respect to development of symptom-based emergency operating procedures (EOPs) was reported. These symptom based EOPs improve the performance of the plant in the event of an incident or accident because they provide a framework within which all critical safety functions can be monitored and appropriate actions taken. They provide a complement to event-based procedures because it isn t possible to anticipate all plant events, particularly combinations of individual events. The Paks NPP staff have integrated the existing event-based procedures with symptom-based EOPs to provide a comprehensive framework to appropriately respond to all abnormal and emergency conditions. 

Emergency Infrequent incidents requiring shutdown for correction of the condition or repair of damage in the system. There is no loss of structural integrity. These include unlikely off-normal conditions which individually are not expected to occur during the plant lifetime. However, when integrated over all plant components, events in this category may be expected to occur a number of times. These may result in minor incidents, that is an occurrence which results in ... 

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