Strategies and dismantling solutions for RPV internals of Trino NPP

The systematic approach developed to identify the optimum dismantling solution is presented and discussed. To the intent three solutions have been identified as more advantageous. In addition, the evaluation of dose rate outside the container has been performed by means of VISIPLAN software, in order to guarantee the respect of the limits imposed by National and International regulations. The obtained results suggest that the cutting of Zircalloy elements in correspondence of the gap between two non-consecutive central stumps, with the possibility to re-arrange the element, led to a significant reduction of the number of containers, with consequent decrease of the stowed RWs volume and overall supplying costs of the activity.