14.7 - Fault and Protection Schedule - EDF Hinkley Point

PRE-CONSTRUCTION SAFETY REPORT
CHAPTER 14: DESIGN BASIS ANALYSIS
SUB-CHAPTER : 14.7
PAGE : 19 / 48
Document ID.No.
UKEPR-0002-149 Issue 02
SUB-CHAPTER 14.7 - TABLE 1: FAULT AND PROTECTION SCHEDULE TABLE: FAULTS AT FULL POWER (2/24)
Input to classification SAFETY FUNCTION MAIN LINE
DIVERSE LINE
No.
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
Reactivity power distribution
Uncontrolled
RCCA bank
withdrawal at
power
Uncontrolled
RCCA bank
withdrawal from
HZP
RCCA
misalignment
up to rod drop
Start-up of an
inactive reactor
coolant loop at
an improper
temperature
CVCS
malfunction that
results in a
decrease in
boron
concentration in
the reactor
coolant *
Uncontrolled
single RCCA
withdrawal
PCC-2
f>10-2/(r.y)
or
PCC-3
10-
4/(r.y)