Assessment Of Steels Used For PWR Nuclear Island Equipments And Research On PRV Nozzle Shell Property

As a response to the12thFive-year Plan and the realization of the energy saving andemission reduction policy, the development of clean energies of which development ofnuclear energy is the top priority, is now imperative. Now nuclear energy construction is stillin its primary stage, each related link is all important to guarantee the safe operation of anuclear plant. In particular to the localized nuclear components manufacture, qualityassurance plays a vital role. The essay will focus on the way to define, select the mainequipment material property, to secure the compliance of material and equipment manufactureto the standards, and to adopt the appropriate inspection and test to verify the result. The firsthalf of the essay will be concentrated on a presentation of different characteristics andrequirements for materials used in different parts of nuclear island main components withmaterial of RPV nozzle shell cited as example to carry out a deepened analysis according tothe standard requirements, where a conclusion is drawn out that the requirements in standardand design are fulfilled, the specification is rationally prepared and capable to guide andstandardize the practice in engineering. The result of research shows that material andmanufacture methodology of NI main components made on a self-reliance basic meet thestandard requirement, and with its practicable engineering experience, it also satisfy the needof the rapid development of nuclear industry. the following conclusion was drawn out fromthe research and analysis described in this text:1,steels used for nuclear island equipmentsshare the same properties which are high purity, low carbon content, high ductility andtoughness, as well as a good weldability. The nuclear safety culture proceeds along withwhole equipment manufacture process that is under control and supervision with hightransparency.2, defining the reasonable and appropriated chemical ingredients requirementsis a prerequisite for the high comprehensive mechanical property of nozzle shell.3, vaccummelting, electric slag remelting and cutting of the exterior parts of ingot ensure the purity ofmolten steel and quality of ingot, which provide solid basis for the following heat treatmentand the good quality.4, conclusion obtained from this experiment and analysis of nozzle shell:the chemical ingredients were reasonably defined, requirements in all aspects such asmechanical properties and toughness fulfill needs of engineering equipment in reality, whichsets up a sample for the future localization of such assembly.