By International Atomic Energy Agency. Technical Working Group on Nuclear Power Plant Control and Instrumentation
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Extra info for The role of instrumentation and control systems in power uprating projects for nuclear power plants
Since the increase in power is justified by a decrease in uncertainty, the power should be reduced if the instrument does not work as intended. The way this is managed should be explicitly described and documented. Ultrasonic flowmeters are commonly used as a means to adjust the measurements in the original feedwater measurement instrumentation, which leads to an interest in the way the adjustment of the original measurement is handled. It is both a question of how often the correction factor is updated and how the acceptance of a correction factor is managed.
I&C plays a major role in all of these areas. An example of the role I&C should play is given. Increased feedwater and steam flows can lead to equipment problems due to flow accelerated corrosion and vibration. Increased vibration in components in systems can cause fatigue induced failures. In order to better understand the current state of equipment and system components, the scope and frequency of vibration and flow accelerated corrosion monitoring should be increased as appropriate. The first step is to identify whether adequate instrumentation exists to perform the scope and frequency of monitoring required.
Therefore, the existing licensing basis should not be adversely affected by the set point changes implemented to accommodate the proposed power uprate. 6. EFFECTS OF TRANSIENTS — HOW INSTRUMENTATION AND CONTROL CAN HELP As discussed in several preceding sections, new analyses will be required to establish the transient behaviour of the plant in response to anticipated operational occurrences and design basis events occurring from the steady state conditions applicable to the new RTP level. The implications are that the control algorithms may benefit from optimization for the new conditions, that the protection system may require new parameters or earlier initiation (revised set point values) for existing 19 parameters, and that various instruments used for protection and post-accident monitoring may require qualification for a more demanding environment.
The role of instrumentation and control systems in power uprating projects for nuclear power plants by International Atomic Energy Agency. Technical Working Group on Nuclear Power Plant Control and Instrumentation