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1、Residual Life Prediction of Power Plant Components Stanislav Vejvoda, Dusan Vincour, Leos Ruzek VTKOVICE Institute of Applied Mechanics Brno, Ltd., Czech Republic ABSTRACT A procedure of a diagnostic system DIALIFE results utilisation for nuclear power plant equipment managed ageing is shown. The di
2、agnostic system assesses a continual damage of power plant equipment material damage from a force load, pressure, thermal fields and an environment. The ON-LINE and OFF-LINE assessment results by the DIALIFE system are utilised for a management of a maintenance, repair and a power plant unit service
3、 management. The aim is to minimise a trend of a material damage and a equipment function. INTRODUCTION A material of nuclear power plant components is permanently damaged during service. At the same time there is a permanent effort to utilise their working parameters more, what multiplies their ris
4、k of a failure. That is why it is necessary to introduce a life-time management system into a routine use with the aim to optimise a management of their servicing and repairs and to optimise a management of their operation and so to minimise a process of a material damage during a service. A life-ti
5、me management system enables to determine the range of a material degradation and an equipment function by an influence of service conditions and so to optimise a maintenance and repairs. It means to change equipment parts according to a reach of a material characteristics limit degradation or an eq
6、uipment function and not for the sake it is prescribed in the project. A project cannot fully affects real service conditions, their history, etc. The scheme of chosen components life-time management system is shown in Fig. 1. Real service conditions and an equipment material response can be ON-LINE
7、 recorded by help of suitable sensors, so by the Instrument and Control system (I and C), by the Monitoring and Diagnostic system (MDS) and by the temporary Special measurement (SM). A life-time management system of a power plant components can be based namely on following factors: 1) a knowledge da
8、tabase creation; 2) a determination of an objective procedure for an assessment; 3) an assessment of a gradual equipment material degradation and rotation machines in a common power plant components service; 4) an acceptance of a provision to reach to longest time of a reliable and safety power plan
9、t component service with acceptable financial costs for its maintenance and modernisation. A COMPONENTS CLASSIFICATION All equipment, engineering parts, communication systems and civil engineering structures of the whole power plant unit have to be liable to a life-time management system. Individual
10、 power plant parts take part in a different rate on a safety, and reliability of the whole power plant. A significant factor is a severity of a damaged component exchange for a new one. That is why it is necessary to divide the whole equipment into groups and it these groups to define usually four c
11、ategories according to influence factors significance, which are an exchange difficulty, a safety and reliability part of a power plant unit, etc. KNOWLEDGE DATABASE A knowledge database presents a summary and sorting of all substantial information about an equipment production, its service, mainten
12、ance and possibly an exchange. Information about a response of component material on a load belongs also here, the same way as information about rotation machines function and information about provide research/development works. Namely there are: 1) Production details handed over by a component pro
13、ducer Standards and procedures used at a design and technological procedures elaboration; technological procedures used at a manufacturing; specification of materials and strength and life-time calculations. SMiRT 16, Washington DC, August 2001Paper # 1209Transactions,. . i i!ii!7iii!i!i!ii2!i:2iJ!J
14、!i!Ni717111iiiiii!i!i!iii:!ii77 identification . L . data ,/ p Patr . L, : data _V i Regime G I data . , _ V 14 Failuresi . i I Collection, As N0ndestructive L “ Special tempor l testing | l measurements / . . I ,._! D .,o d so.so . i testing diagnostic procedure / I / I ! 7 Database U r._“ Chemism
15、. I I . fMaterials- . -: /, database I I = M,nue.-u,d.“l I 1,2 Instnnnentatin 1 I._ ofC0mp nents ,i I and control system I class“-dffication, care, verificationd 1“ savingE“ Power plant information system Service diagnostic system “ ON-LINE fatigue, creep, corrosion, (sheet, pitting, stress cracking), fundamemal strength, function of rotary machines uipmem 17 OFF-LINE fatigue, creep, creep, creep and fatigue, stress corrosion cracking allowed crack growth, erosion: strength, function of rotary machines 32 ON-LINE fatigue, stress corrosion crac
