In case you need more context: 07:02 Jul 26, 2016
Thus, all items important to safety should be constructed above the level of the design basis flood, with account taken of wind wave effects and any accompanying event(s) that may affect the reference level of the water at the time of the design basis flood (such as storm surges, sea level rise, tectonic movement, accumulation of debris and ice). In many Member States, this concept is preferred to the alternative solution of permanent external protective barriers such as levees, sea walls and bulkheads, which require being classified as safety related SSCs with strict design and construction engineering, periodic inspections, maintenance and monitoring features, among other aspects important to safety. In both cases, redundant and conservative measures should be implemented owing to the intrinsic cliff edge characteristics involved in surmounting the protective barriers in place. These measures include ensuring waterproofing and the suitable design of items necessary to provide the capability to properly perform the fundamental safety functions of shutting down the reactor and maintaining it in safe shutdown condition |