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IEC 61505:1998
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
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Nuclear reactor instrumentation - Boiling water reactors (BWR) - Stability monitoring
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
31-12-2021
English - French
10-11-1998
FOREWORD
INTRODUCTION
1 Scope and object
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Physics, measurement and analyses of instabilities
5.1 Physics of BWR core instabilities
5.2 Possible consequences of core instabilities
5.3 Measuring principles
5.4 Analysis methods
6 Functional requirements
6.1 On-line monitoring
6.2 Off-line monitoring
6.3 Man-machine interface
6.4 Response time
6.5 Accuracy
6.6 Robustness
7 Safety classification
8 Technical requirements
8.1 Data acquisition system
8.2 Data processing and operator interface system
8.3 Hardware (HW)
8.4 Software (SW)
9 Verification and validation
10 Testing and maintenance
11 Qualification and documentation
Figure 1 - The four methods of coolant recirculation through
the core of a BWR
Figure 2 - Neutronic and thermal-hydraulic feedback
mechanisms
Figure 3 - Feedback mechanisms for coupled neutronic-
thermalhydraulic reactivity instability
Figure 4 - Example of BWR stability monitor
Annex A - Automatic detection and suppression
Annex B - Examples of BWR power oscillation occurrences
Annex C - Examples of instability tests
Annex D - Instability prevention concept
Annex E - Operating experience with stability monitoring
Annex F - Estimation of neutron noise characteristic function
Annex G - Estimation of phase difference
Annex H - Bibliography
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