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S13 Integridade Estrutural |
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Title:
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STRUCTURAL INTEGRITY EVALUATION OF PWR NUCLEAR REACTOR PRESSURE VESSELS
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Summary :
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THE REACTOR PRESSURE VESSEL (RPV) IS THE MOST IMPORTANT STRUCTURAL COMPONENT OF A PWR NUCLEAR POWER PLANT. IT CONTAINS THE REACTOR CORE AND IS THE MAIN COMPONENT OF THE PRIMARY SYSTEM PRESSURE BOUNDARY, THE SYSTEM RESPONSIBLE FOR REMOVING THE HEAT GENERATED BY THE NUCLEAR REACTIONS. IT IS CONSIDERED NOT REPLACEABLE AND, THEREFORE, ITS LIFETIME IS A KEY ELEMENT TO DEFINE THE PLANT LIFE AS A WHOLE. THREE CRITICAL ISSUES RELATED TO THE RELIABILITY OF THE RPV STRUCTURAL INTEGRITY COME OUT BY REASON OF THE RADIATION DAMAGE IMPOSED TO THE VESSEL MATERIAL DURING OPERATION. THESE ISSUES CONCERN THE DEFINITION OF PRESSURE VERSUS TEMPERATURE LIMITS FOR REACTOR HEATUP AND COOLDOWN, PRESSURIZED THERMAL SHOCK EVALUATION AND ASSESSMENT OF REACTOR VESSELS WITH LOW UPPER SHELF CHARPY IMPACT ENERGY LEVELS. THIS WORK AIMS TO PRESENT THE MAJOR ASPECTS RELATED TO THESE TOPICS. THE REQUIREMENTS FOR PREVENTING FRACTURE OF THE RPV ARE REVIEWED AS WELL AS THE AVAILABLE TECHNOLOGY FOR ASSESSING THE SAFETY MARGINS. FOR EACH MENTIONED PROBLEM, THE SEVERAL STEPS FOR STRUCTURAL INTEGRITY EVALUATION ARE DESCRIBED AND THE ANALYSIS METHODS ARE DISCUSSED.
KEYWORDS: PRESSURE VESSEL, STRUCTURAL INTEGRITY, FRACTURE MECHANICS
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Author :
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Cruz, Julio R. B.
Mattar Neto, Miguel 0
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Paper View :
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