FOREWORD
INTRODUCTION
1 Scope and object
2 Normative references
3 Definitions and abbreviations
4 Operating conditions
4.1 General
4.2 Normal power operation
4.3 Hot shutdown operations
4.4 Abnormal and accident conditions
4.5 Cold shutdown operations
5 Measurement methods
5.1 General
5.2 RPV water level measuring devices
5.3 RPV inlet/outlet pipe water level measuring
devices (systems as shown in figure 2)
5.4 Core exit temperature sensing devices
6 Instrumentation requirements
6.1 General
6.2 Differential pressure measurement
6.3 Heated sensor measurement
6.4 Ultrasonic liquid level measurement
6.5 Temperature sensing devices
7 Data processing
8 Presentation of information
9 Verification and calibration
10 In-service testing and maintenance
11 Qualification
12 Documentation
Annex A (informative) Events with potential core cooling
degradation at VVERs
Annex B (informative) Plant operating states
Figure 1 - PWR configuration: (VVER-440) - Horizontal
steam generators
Figure 2 - PWR configuration: (VVER-1000) - Horizontal
steam generators
Figure 3 - Water level measurement by differential pressure
method for VVER 1000
Figure 4 - Thermal-hydraulic considerations affecting water
level measurements (VVER-1000 systems) at reduced
inventory and reverse flow
Figure 5 - Water level measurement by direct acting
transmitter (VVER-1000 systems) at reduced
inventory and reverse flow