BOP instrumentation provides additional measurements that are beyond the scope of NSSS instrumentation. BOP instrumentation deals with systems associated with the turbine generator and the electric power making part of the plant. The instrumentation parameters are the same (pressure, temperature, level, and flow), but the quality pedigree is not as rigid. In many cases the secondary side vendors supply the instrumentation and control required for their supplied equipment. For example, most instrumentation required for turbine generator control is provided by the supplier of the turbine generator system. In many traditional PWRs, the vendors supply the equipment and all related instrumentation and controls.

Condenser-related measurements are another BOP instrumentation category. The condenser itself requires temperature, pressure, and level measurements. Additionally, condenser cooling systems require temperature and flow measurements. The pumps and piping that recycle the condenser water into the feedwater system need flow measurements to control flow through flow control valves.

Some heating, ventilation, and air conditioning (HVAC) system measurements may also be grouped into the BOP instrumentation category. To the extent that cooling water is recycled to provide cooling for the HVAC in certain plant areas, the HVAC-related cooling systems will need to have control systems for cooling water control valves. The HVAC systems may also need to control or throttle air flow, and may require air flow or temperature sensors to facilitate this function.

It is expected that some of the same instrumentation used in traditional PWRs will be used for iPWR BOP instrumentation. In some cases, size constraints will demand a newer device or a redesigned device, but since the temperature, pressure, and radiation environments for BOP instrumentation are in general not as extreme as those for RPS and NSSS environments, the flexibility to use newer technology will allow for more instrumentation options.