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IAEA Meeting Vienna 29.05-01.06 2012 Assessment of management of ageing of major nuclear power plant components important to safety: concrete structures. Bakirov Murat (Russia) VITALITY OF PROJECT Vitality is high, because: 1) IAEA-TECDOC-1025 was made in 1998, when practical experience of PLEX were not exist. (And now such experience is accumulate and continue to building up) 2) Containment, confainment, main reactor building are important barrier of safety. (Fucusima accident shows that in situation of serious disaster containment was the last and the most important barrier) 3) Now absence of unify approach (methodology) to estimate condition of confainment building after project lifetime. (It’s nessessary to make it like it was made for equipment of NPP’s) VITALITY OF PROJECT 4) Depth understanding of mechanism of ageing will be base of knowledge for modernization of reactor buildings for new NPP projects. (Satisfaction of new high level requirements) 5) Examination of modern methods and procedures of inspection and monitoring technics for reinforced concrete structures. (Recommendation to select the most effective non-destructive testing methods and also periodicity of control and places of control) 6) Analysis of failure, distress and repair of concrete structures. ( Recommendation to maintenance and additional calculations and experiments.) 7) Choosing the most effective calculation models of analysis of a reinforced concrete containment on account of project (non-project) accidents. (Earthquake, rapture of main pipes and destroying of pressure vessel, optimization of tension of steel-rope ) NAME OF DOCUMENT? Assessment and management of ageing of major nuclear power plant components importing to safety: concrete containment buildings or concrete structures? Our aim is to extend our document? We not only describe containment buildings but also reactor building, turbine hole and middle building? Classification of nuclear reactor types in common use. WWER reactors in operation – two major types WWER – 440 designs (V-179, V-230, V-213 ) Confainment area Cross section of WWER-1000 V-320 Containment building Previous materials Previous materials received from scientific secretary IAEA J. Moore /K. Kang is very good starting base summarized previous experience in that field (based on IAEA techdoc). Probable contents based on original publication of TECDOC1052, -1400 and others materials of IAEA, including my personal opinion. Contence 1) Introduction (TECDOC-1025) 2) Concrete containment building (TECDOC-1025) 3) Failure mechanisms in concrete 3.1 Causes and mechanisms of deterioration in reinforced concrete 1 Microstructure and role of environment in concrete deterioration 2 Physically induced deterioration (freeze, effect of salt, porosity, erosion) 3 Chemically induced deterioration (carbonation, corrosion of steel reinforcement. Contence 3.2 Types of concrete damage 1 Causes and mechanisms of concrete damage 2 Chemical attack 3 Fire 4 Static overloading 5 Impact (local dynamic effect) 6 Earthquake (the seismic load is not a local effect) 7 Pressure impact 8 ??? 3.3 Types and causes of cracking in concrete structures 1 Cracking in plastic stage 2 Cracking after hardening 3 Assessment of distressed concrete 4 Fatigue cracking Contence 3.4 Conditional assessment of concrete structure 1 Introduction in evaluation of concrete structures – overview 2 Methodologies to assessment concrete structure according to feature of concrete containment building 3 Stages of concrete assessment (documentation review, in situ non distructive and distructive testing 4 Development of sampling plan 5 Development of a testing program 6 FEM calculation 7 Evaluation of test results and calculation results and engeneering analysis 8 Proposals to mitigation of ageing effect (repair) 3.5 Evolution technic and test methodology … joint with HUGE important part 4 3.6 Laboratory testing 3.7 Load testing of construction 5) Understanding and detecting ageing 6) Assessment and repairing ageing effect 7) Concrete containment building ageing management programme (to all types of reactors) 8) Conclusion and recomindation Part 4 Testing methods for reinforced concrete Building NPPs (destructive testing-DT,non-destructive NDT, minor destructive testing MDT) INTODUCTIN PRINCIPLES MEASUREMENT METHODS WHEN USE HOW TO INTERPRET THE MEASUREMENT VALUES PRACTICAL APPLICATION NEW TECHNIGUES COMBINATION OF TESTING METHODS FUTURE TRENDS SELECTED EXAMPLES OF EFFECTIVE AND INNOVATION MONITORING TECHNOLOGIES References (thise chapter in finish of) I’m sure that our future activity is going to be fruitful