AnsaldoEnergia

Divisione Nucleare
Progetto
Project
PDS-XADS
AnsaldoEnergia
Identificativo
Document no.
XADS 20 TRIX 009
Rev.
Rev.
1
Cl. ris.
class
Pagina
Page
3
CONTENTS
1. SCOPE.......................................................................................................................6
2. INTRODUCTION........................................................................................................7
3. IDENTIFICATION OF ACCIDENT INITIATING EVENTS..........................................8
3.1 GENERAL ......................................................................................................................8
3.2 BRIEF DESCRIPTION OF THE MAIN COMPONENTS/SYSTEMS OF THE
XADS ..............................................................................................................................8
3.2.1 Reactor System........................................................................................................11
3.2.2 Reactor Coolant System .........................................................................................16
3.2.3 Intermediate Heat Exchangers ...............................................................................19
3.2.4 Reactor Proton Beam Target System ....................................................................19
3.2.5 Primary Cover Gas System.....................................................................................22
3.2.6 Secondary Coolant System ....................................................................................23
3.2.7 Reactor Vessel Air Cooling System.......................................................................26
3.2.8 Accelerator...............................................................................................................28
3.3 MASTER LOGIC DIAGRAM ........................................................................................42
3.4 FUEL CLADDING CHALLENGES...............................................................................43
3.4.1 Power Anomalies.....................................................................................................43
3.4.2 Decrease of fuel assembly heat removal ..............................................................45
3.5 REACTOR COOLANT SYSTEM AND TARGET UNIT COOLANT SYSTEM
CHALLENGES .............................................................................................................46
3.5.1 Reactor Coolant System Challenges .....................................................................47
3.5.2 Target Unit Coolant System Challenges ...............................................................67
3.6 CONTAINMENT CHALLENGES..................................................................................75
3.7 LIST OF ACCIDENT INITIATING EVENTS .................................................................86
4. CATEGORIZATION OF ACCIDENT INITIATING EVENTS ....................................89
4.1 CATEGORY GROUPING CRITERIA ...........................................................................89
4.2 LIST OF ACCIDENT INITIATING EVENTS CLASSIFIED IN EACH
CATEGORY..................................................................................................................90
DNU 020/1