14.7 - Fault and Protection Schedule - EDF Hinkley Point

PRE-CONSTRUCTION SAFETY REPORT
CHAPTER 14: DESIGN BASIS ANALYSIS
SUB-CHAPTER : 14.7
PAGE : 31 / 48
Document ID.No.
UKEPR-0002-149 Issue 02
Input to classification
SUB-CHAPTER 14.7 - TABLE 1: FAULT AND PROTECTION SCHEDULE TABLE: FAULTS AT FULL POWER (14/24)
SAFETY FUNCTION
MAIN LINE
DIVERSE LINE
Fault
description
Category
References
Frequency
PCSR
Ref.
Main Safety
Function
Transient phases
Cont.
state
Safe
state
Final
state
Plant Level Safety Function
Based on EPR process and
international practice for
PWR
Safety Cat.
Lower Level Safety Function
Combination of the Plant Level
Safety Function and the
conditions of operations
(normal, incident, accident)
Safety Functional Groups
Item
Safety
class
System
Req.
Lower Level Safety Function
Combination of the Plant Level
Safety Function and the
conditions of operations
(normal, incident, accident)
Safety Functional Groups
Item
Safety
class
Syst
Req.
Supporting study
Comments
Increase in Heat Removal
Reactivity
Control
x
x
x
x
x
Shutdown and maintain core
sub-criticality
Prevention of uncontrolled
positive reactivity insertion
into the core
A
A
A
Negative reactivity fast insertion
High concentrated boron
injection
RCS overcooling protection
Reactor trip - auto
dP/dt
Actuation PZR P, SG P, Cont
P, DNBR
Front. Syst. CRDM
Emergency boron injection into
the core - Auto
Activ. & Elec SG P
Front. Syst. EBS
Turbine Trip
Actuation RT checkback
Front. Syst.
Turbine admission
valves
Full load MFW isolation (4 SG)
Actuation RT checkback
Front. Syst.
Full load MFW
isolation valves
EFW isolation (1 SG)
Actuation Manual
Front. Syst.
EFWS injection lines
Class 1
Class 1
Class 1
Class 1
Class 1
F1A
F1A
F1A
F1A
F1A
PS
PS
PS
PS
PS
x
Steam line isolation (1SG)
Activ. & Elec dP/dt, SG P
Front. Syst. MSIV
Class 1
F1A
PS
Steam system
line break
(states A and B)
PCC-4
10-6/(r.y)