**** 1 - Nuclear/Hydrogen System Lab

Report
Chapter1: Nuclear Reactor Heat
Transport System
Hee cheon NO
Nuclear System/Hydrogen Lab.
KAIST
1
Contents
Chapter 1 Nuclear reactor heat transport system
1.1 Nuclear fuel
1.2 Reactor vessel
1.3 Reactor core and fuel assembly
1.4 Rod cluster control assembly
2
1.1 Nuclear fuel
Fuel rod
3
1.1 Nuclear fuel
Pellet hourglassing and Pellet-Cladding Mechanical
Interaction(PCMI)
dish/chamfer
4
1.1 Nuclear fuel
Fuel cracking
5
1.1 Nuclear fuel
Example of fuel failure mechanisms
6
1.1 Nuclear fuel: Intergranular SCC
Intergranular SCC
7
1.1 Nuclear fuel:
Cladding Ballooning & rupture
 Transient cladding ballooning: LOCA
stress
ultimate
tensile
stress
strain
8
1.1 Nuclear fuel: Cladding rupture
Post-CHF operation: Non-LOCA
Reactivity-Initiated
Accident(RIA)
9
1.1 Nuclear
fuel
PCMI
10
1.2 Reactor vessel
RCB: Rx Containment Building; TGB: Turbine/Generator
Building; AB: Auxiliary Building; CB: Compound
Building
Upper head
Upper plenum
upper core plate
APR1400
NSSS
Lower plenum
Typical 4 loop Rx vessel
11
1.2 Reactor vessel
12
1.2 Reactor vessel
Estimation of core mass flow rate:
m p c p (T hot  T cold )  Q R C P  Q prim ary  losss  m feedw ater ( h steam  h fe edw ater )   m p ,
m p  m core  m bypss   m core  m p (1  Fbypass )
w here
Q SG  m feedw ater ( h steam  h feedw ater )  sec ondary calorim etric
Q R x  m p c p (T hot  T cold ); Q c ore  m core c p (T hot  T cold )
Fbypass  bypass flow fraction  m bypss / m p
Flow paths
APR1400 설계값
Vessel flow rate
20,991.2 kg/sec
Guide tube
154.9 kg/sec
Core shroud annulus
84.2 kg/sec
Outlet nozzle gap
288.9 kg/sec
Alignment key
101.9 kg/sec
APR Bypass overall
629.9 kg/sec
UK EPR:
3.0%
5.5%
13
1.2 Reactor vessel
14
1.2 Reactor vessel: irradiation specimen (Nil-ductility transition T)
15
1.3 Reactor core and fuel assembly
Typical 4-Loop core
APR
cladding volume(m^3)
Zr total mass(kg)
3.72 Zr mass in fuel(Kg)
Zr mass in struc(kg)
29647
24197
5450
16
1.3 Reactor core and fuel assembly
core and fuel
17
1.3 Reactor core and fuel assembly
Assembly
18
1.3 Reactor core and fuel assembly
19
1.3 Reactor core and fuel assembly
Assembly(PLUS7)
20
1.3 Reactor core and fuel assembly
Assembly(PLUS7)
21
1.3 Reactor core and fuel assembly
Assembly
22
1.3 Reactor core and fuel assembly
Spacer grid
23
1.3 Reactor core and fuel assembly
24
1.4 Rod cluster control assembly
25

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