The IRP considers that the Axpo Safety Case is acceptable. This is based on the following:
- It has been established beyond all reasonable doubt that the flaws are laminar ‘agglomerates’ of alumina inclusions, formed during manufacture of the affected RPV shells, and which neither formed nor grew during service.
- It has been adequately demonstrated that such agglomerates do not significantly affect the materials properties relevant for structural integrity assessment or sensitivity to irradiation damage.
- The ultrasonic testing carried out on the RPV was sufficient to ensure that all flaws that might significantly affect structural integrity were detected and conservatively assessed.
- A fracture mechanics assessment of the flaws, using highly conservative assumptions, demonstrated that the case is robust.
ENSI Review of the Axpo Power AG Safety Case for the Reactor Pressure Vessel of the Beznau NPP Unit 1
In the summer of 2012, findings are detected in the basic material of the reactor pressure vessel of the Belgian nuclear power plant Doel-3. As a result, nuclear power plants in Switzerland also have to carry out inspections. Since findings are also detected in the reactor pressure vessel of Beznau 1, Axpo needs to prove […]