Statistical approach to compliance with maximum channel power licence limits in Ontario Hydro reactors

For each Ontario Hydro reactor, compliance with a licence limit on channel powers is monitored using a reactor simulation code which computes an estimate of maximum channel power. A novel approach to the computational error and its treatment as a random variable has permitted generic compliance criteria to be derived which are based on a probabilistic interpretation of the licence. The criteria provide justifiable operating procedures to satisfy the licence statement. A reactor power increase for Bruce Nuclear Generating Station A reactors has been made following optimization of an operating guideline limit for computed maximum channel power. This power increase has resulted in replacement energy savings of $0.6 million per unit month at 95% Full Power operation.