IEEE 62582-1-2011 Nuclear power plants C Instrumentation and control important to safety C Electrical equipment condition monitoring methods C Part 1 General.pdf

1、 IEC/IEEE 62582-1 Edition 1.0 2011-08 INTERNATIONAL STANDARD Nuclear power plants Instrumentation and control important to safety Electrical equipment condition monitoring methods Part 1: General Centrales nuclaires de puissance Instrumentation et contrle-commande importants pour la sret Mthodes de

2、surveillance de ltat des matriels lectriques Partie 1: Gnralits IEC/IEEE 62582-1:2011NORME INTERNATIONALE THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland Copyright 2011 IEEE All rights reserved. Unless otherwise specified, no part of this publication may be reproduced

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12、ERNATIONAL STANDARD Nuclear power plants Instrumentation and control important to safety Electrical equipment condition monitoring methods Part 1: General Centrales nuclaires de puissance Instrumentation et contrle-commande importants pour la sret Mthodes de surveillance de ltat des matriels lectriq

13、ues Partie 1: Gnralits N ICS 27.120.20 ISBN 978-2-88912-668-2 INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICE CODE CODE PRIX NORME INTERNATIONALE 2 62582-1 g148 IEC/IEEE:2011 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope and object 7 2 Normative references

14、 . 7 3 Terms and definitions . 7 4 Condition indicators 8 4.1 General . 8 4.2 Chemical indicators . 9 4.3 Physical indicators 9 4.4 Electrical indicators . 9 4.5 Miscellaneous Indicators . 9 5 Applicability of condition indicators to different types of organic materials 9 6 Destructive and non-destr

15、uctive condition monitoring . 10 7 Application of condition monitoring in equipment qualification and management of ageing 10 7.1 General . 10 7.2 Use of condition monitoring in the establishment of qualified life . 10 7.2.1 Establishment of qualified life 10 7.2.2 Determination of acceleration fact

16、or in accelerated thermal ageing 10 7.3 Use of condition monitoring in the extension of qualified life 12 7.4 Use of condition monitoring in the establishment and assessment of qualified condition . 12 7.5 Use of baseline data 13 Bibliography 14 Figure 1 Example of an Arrhenius diagram. 11 Figure 2

17、Influence of activation energy on qualified life, determined from artificial thermal ageing for 42 days at 110 C, followed by simulated design basis event . 12 Figure 3 Illustration of condition-based qualification . 13 62582-1 g148 IEC/IEEE:2011 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ NUCLEAR

18、 POWER PLANTS INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY ELECTRICAL EQUIPMENT CONDITION MONITORING METHODS Part 1: General FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC Nat

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33、blications. 8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that implementation of this IEC/IEEE Publication may require use of m

34、aterial covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. IEC or IEEE shall not be held responsible for identifying Essential Patent Claims for which a license may be required, for c

35、onducting inquiries into the legal validity or scope of Patent Claims or determining whether any licensing terms or conditions provided in connection with submission of a Letter of Assurance, if any, or in any licensing agreements are reasonable or non-discriminatory. Users of this standard are expr

36、essly advised that determination of the validity of any patent rights, and the risk of infringement of such rights, is entirely their own responsibility. 4 62582-1 g148 IEC/IEEE:2011 International Standard IEC/IEEE 62582-1 has been prepared by subcommittee 45A: Instrumentation and control of nuclear

37、 facilities, of IEC technical committee 45: Nuclear instrumentation, in cooperation with the Nuclear Power Engineering Committee of the Power however, it is often 62582-1 g148 IEC/IEEE:2011 9 difficult to perform these types of measurements directly in the field with the required degree of repeatabi

38、lity and accuracy. In organic materials, ageing occurs that may adversely impact the important safety function through a range of chemical reactions, including chain scission and cross-linking, which alter the polymeric structure. For condition monitoring programs, it becomes imperative to find meth

39、ods that, either directly or indirectly, follow the progress of these reactions. A large number of methods exist to perform this task, which makes it difficult to provide an overview of each individual technique. Instead, this standard will focus on general groups of methods. The overall description

40、 of these groups is provided below. 4.2 Chemical indicators As mentioned above, the degradation mechanism for organic materials follows from a series of chemical reactions in which the chemical structure of the polymer is altered. The progressive change in the chemistry of the material provides an o

41、pportunity to monitor the degradation throughout its ageing. Numerous techniques exist to perform this task, some which monitor the polymer chain degradation itself and others which monitor side reactions which are related to the degradation. 4.3 Physical indicators Another key family of indicators

42、includes techniques which monitor the materials physical properties. The degradation of organic materials manifests itself in changes to these physical properties (i.e. tensile strength, elongation, and hardness). By measuring these physical characteristics, it is possible to create a correlation wi

43、th the aged condition of the material. 4.4 Electrical indicators A third category of techniques involves measuring electrical properties of the materials. Many of these techniques were developed for polymeric materials used in electrical insulation. Within this family there are two basic subsets of

44、methods. The first subset involves measuring the dielectric properties of the materials. A second subset of methods monitors the electrical response of systems under normal operation. In these cases, a signal is passed through the electrical system and any changes from baseline are detected. These c

45、hanges could be signs of degradation, whether through ageing or through physical damage. 4.5 Miscellaneous Indicators As new technologies are developed and implemented, it becomes necessary to develop condition monitoring methods to keep pace. As such, some methods are developed specifically for cer

46、tain types of materials. 5 Applicability of condition indicators to different types of organic materials There is currently no single condition monitoring method which is suitable for all organic or polymeric materials. A basic requirement for inclusion in a part of IEC/IEEE 62582 is that the condit

47、ion indicators are sensitive to the effects of ageing. An important characteristic of a useful condition indicator is that it shows a trend that changes monotonically with degradation and can be correlated with the safety related performance. An indicator that does not change for a long time and the

48、n suddenly undergoes drastic changes is not useful for prognostic applications. This can be the case with mechanical condition monitoring on semi-crystalline materials, e.g. cross-linked polyethylene and thermosetting resins, dependant on the formulation. 10 62582-1 g148 IEC/IEEE:2011 Information on

49、 the applicability of various condition indicators to different polymeric materials used in instrument and control equipments in nuclear power plants can be found in NUREG/CR-7000 and in IAEA-TECDOC-1188, see Bibliography. 6 Destructive and non-destructive condition monitoring A condition monitoring method may be considered destructive or non-destructive, depending on whether the measurement or the sampling of material used for the measurement will affect operability or future ageing