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BSI 24/30497426 DC 2024

BSI 24/30497426 DC 2024

$10.54

BS EN 61888 Nuclear power plants. Instrumentation important to safety. Determination and maintenance of trip setpoints

Published By Publication Date Number of Pages
BSI 2024 40
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PDF Pages PDF Title
6 INTERNATIONAL ELECTROTECHNICAL COMMISSION
FOREWORD
8 INTRODUCTION
11 Scope
Normative references
Definitions
18 Abbreviations
Determination of setpoints
19 5.1 Safety
5.2 Safety analysis
5.3 Limiting Safety System Setting (LSSS)
5.3.1 Channel uncertainty and trip setpoint
22 5.3.2 Methodology of channel uncertainty determination
5.3.2.1 General
5.3.2.2 Conservative methodology
5.3.2.3 Alternative methodology
23 5.3.3 Trip setpoint
5.3.4 Allowable value
5.4 Combination of uncertainties
24 5.5 Operational considerations
5.6 Instrument channel range
Documentation
25 Maintenance of safety system setpoints
7.1 General
7.2 Testing
7.3 Replacement
28 Annex A Annex A (informative) Example of setpoint determination
A.1 Setpoint – Reactor high pressure
30 Annex B (informative) Comparison of the uncertainty calculation methodologies
A.2 Uncertainty distribution functions
A.3 Uncertainty combination methods
A.3.1 ISA 67.04.01 or IEC 61888 Ed1 approach
31 A.3.2 GUM1995 approach
32 A.4 Example calculation
A.4.1 Case 1:
A.4.1.1 ISA67.04.01 Method:
A.4.1.2 GUM1995 Approach
A.4.2 Case 2:
A.4.2.1 ISA67.04.01 Method:
A.4.2.2 GUM1995 approach:
33 A.4.3 Case 3:
A.4.3.1 ISA67.04.01 Method:
A.4.3.2 GUM1995 approach:
A.4.4 Case 4:
A.4.4.1 ISA67.04.01 Method:
A.4.4.2 GUM1995 approach:
34 A.4.5 Case 5:
A.4.5.1 ISA67.04.01 Method:
A.4.5.2 GUM1995 approach:
A.5 Discussions
36 A.6 Comparison between IEC 61888 Ed1 and Ed2
37 Annex C (informative) Example of Monte Carlo Simulation
A.7 General
A.8 Procedure of Monte Carlo Simulation
A.8.1 Define the output element and input sources
A.8.2 Modelling
A.8.3 Estimate the probability density functions (PDFs) for the input elements
A.8.4 Set up and run the Monte Carlo simulation
38 A.8.5 Summarize and express the results
A.9 Example of Python program for Monte Carlo simulation of Case 4 in Annex B
40 Bibliography

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BSI 24/30497426 DC 2024
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