“…Practical rules assessment requires that the stress intensity factor at a postulated or detected defect should be below the reference deterministic fracture toughness curve in any situation. In the case of a Loss Of Coolant Accident (LOCA), as shown for example in [3] where the stress intensity factor varies as the temperature decreases, these practical rules may be over-pessimistic as they do not account for load history effects on fracture toughness of RPV steel, as the so-called Warm PreStress (WPS) effect.…”