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BS EN 62765-1:2017

BS EN 62765-1:2017

$167.15

Nuclear powers plants. Instrumentation and control important to safety. Management of ageing of sensors and transmitters – Pressure transmitters

Published By Publication Date Number of Pages
BSI 2017 34
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This part of IEC 62765 provides strategies, technical requirements, and recommended practices for the management of ageing to ensure that ageing of pressure transmitters important to safety in nuclear power plants (NPPs) can be identified and that suitable remedial actions are undertaken as necessary to demonstrate that the safety of the plant will not be impaired. This standard is aligned with the IEC 62342 standards, which provides guidance on ageing management for I&C systems important to safety in NPPs. This standard, IEC 62765-1 , is the first part for pressure transmitters in the IEC 62765 sensor and transmitter series for pressure, temperature, neutron and other sensors.

This standard deals with analogue electronic pressure transmitters, which have an electrical signal output that is a function of pressure applied on the sensing part, and which are included in I&C systems important to safety in accordance with IAEA terminology.

Any software used for data acquisition, data qualification, or data analysis for transmitter testing or condition monitoring system for pressure transmitter is classified according to IEC 62138 depending on its functionality as specified in IEC 61226 . The qualification of the software for the digital data processing is beyond the scope of this standard.

Additional condition monitoring system for ageing management of the pressure transmitters is classified according to IEC 61226 with respect to its functionality. If classified, the software installed in the monitoring system complies with IEC 62138 for its B or C categorised function.

Regarding environmental qualification, the requirements of IEC 60780 apply. For assessing the performance of transmitters in the safety system instrument channel, the IEC 62385 methods, IEC 61888 requirements and IEC 60671 surveillance testing requirements apply.

Pressure measurements may be used for the measurement of other parameters that can be related to pressure, e.g., level or flow. Interfaces which include sensing lines, condensing pots, and primary (e.g., flow) elements between process and transmitters are within the scope of this standard.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms and definitions
17 4 Abbreviations
5 Background
5.1 General
5.2 Type of transmitter and interface
5.2.1 Type of transmitters
18 5.2.2 Interface between sensing part and process
5.3 Reasons for transmitter ageing management
19 5.4 Environmental stressors
5.4.1 General
5.4.2 Radiation
Tables
Table 1 ā€“ Examples of ageing effects that can cause performance degradation in PTs
20 5.4.3 Temperature
5.4.4 Humidity
5.4.5 Pressure transients
5.4.6 Vibration
5.4.7 Corrosive chemical reaction
21 5.5 Sensing line problems to be considered with transmitter ageing
5.6 Techniques for detecting pressure transmitter ageing
Table 2 ā€“ Examples of environmental stressors with potential to damage transmitters
22 6 Ageing management of transmitters
6.1 General
6.2 Methodology of ageing management
23 6.3 Identification of ageing by performance verification test
6.4 Test and inspection interval
Figures
Figure 1 ā€“ Conceptual methodology of ageing management
24 6.5 Test location
6.6 Calibration of measurement and test equipment
6.7 Test and inspection results
6.8 Validation of test methods
6.9 Classification of condition monitoring system and its software
6.10 Replacement of transmitter or its parts
25 7 Acceptable means for transmitter testing
8 Relationship between initial qualification and transmitter ageing management
26 Annex A (informative) Calibration for type tests or periodic tests
A.1 General
A.2 Configuration for calibration of transmitters
A.3 Uncertainty and TDF between M&TE and EUT
Figure A.1 ā€“ Process and transmitter configuration for calibration
27 A.4 Criteria for calibration tolerance
A.4.1 As-found value and as-left value
A.4.2 Allowable conditions for adjustment in calibration
A.5 Calibration with adjustment
28 Annex B (informative) Performance verification tests
B.1 Test ā€“ Verification of performance
B.2 Acceptable limits for test
B.2.1 Linearity and accuracy
Table B.1 ā€“ Consideration for verification of performance (see IEC 62385:2007, Clauses 5 and 6)
29 B.2.2 Response time
B.3 Alternative method with on-line calibration
Table B.2 ā€“ Uncertainty of elements for Pressure transmitters (see IEC 61888:2002, 5.3.1)
Table B.3 ā€“ Comparison between traditional and on-line tests of response time
30 B.4 Remedial actions for inoperable transmitters
B.5 Written procedure for calibration
Table B.4 ā€“ Required actions followed by as-found value during calibration test as an example
32 Bibliography

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BS EN 62765-1:2017
$167.15