The pre-stressing tendons prevent cracking of the concrete in case of a reactor accident, why the tension in the tendons is crucial to the integrity of the reactor containment. The tendon forces decrease over time, so to ensure the integrity of the reactor containment, it is important to monitor the tendon forces.
This report suggests an instrumentation system of the reactor containment for the Finnish nuclear power plant Olkiluoto 2, for measuring the global and local deformations of the structure, moisture and temperature. The system could be used for continuous long-term measurements and during the periodic pressure tests.
