Adaptation of the Modern Approaches for Protection of Nuclear Power Plantsagainst the Effects of Postulated Pipe Ruptures to the Russian National Guides.Problems and Experience

摘要

Requirements for protection of Nuclear Power Plants against postulated ruptures of High-Energy Piping systemsrnpresent practically in all National and International Guidelines for NPP Safety Design.rnBasically this problem consists of three general parts:rn1) location of postulated ruptures;rn2) consideration of the pipe rupture’s consequences;rn3) realization of the protective measures.rnPresented paper describes the evolution and contemporary state of the problem regarding existing WWERrnNPPs in East Europe and Russia, as well as implementation of the High Energy Line Breaks (HELB) Analysis for thernnew-designed WWER Units.rnPaper presents the analysis of the current Russian National Guides regarding High Energy Line Breaksrn(HELB) problem. On the basis of this analysis the proposals for entering in Russian National Guide documentationrnchanges and additions are developed.rnA special emphasis is given on the formulation of the intermediate rupture’s locations based on the StrengthrnAnalysis according to PNAE G-7-002-86 (Russian Code) stress equations.rnThe numerical comparative PNAE-ASME Analysis has been performed to illustrate the main approaches ofrnthe proposed methodology.