Transcript **** 1 - Nuclear/Hydrogen System Lab

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
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1.1 Nuclear fuel
Fuel rod
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1.1 Nuclear fuel
Pellet hourglassing and Pellet-Cladding Mechanical
Interaction(PCMI)
dish/chamfer
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1.1 Nuclear fuel
Fuel cracking
5
1.1 Nuclear fuel
Example of fuel failure mechanisms
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1.1 Nuclear fuel: Intergranular SCC
Intergranular SCC
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1.1 Nuclear fuel:
Cladding Ballooning & rupture
 Transient cladding ballooning: LOCA
stress
ultimate
tensile
stress
strain
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1.1 Nuclear fuel: Cladding rupture
Post-CHF operation: Non-LOCA
Reactivity-Initiated
Accident(RIA)
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1.1 Nuclear fuel
PCMI
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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
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1.2 Reactor vessel
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1.2 Reactor vessel
Estimation of core mass flow rate:
m p c p (Thot  Tcold )  QRCP  Q primary losss  m feedwater (hsteam  h feedwater )  m p ,
m p  mcore  mbypss  mcore  m p (1  Fbypass )
where
QSG  m feedwater (hsteam  h feedwater )  sec ondary calorimetric
QRx  m p c p (Thot  Tcold ); Qcore  mcore c p (Thot  Tcold )
Fbypass  bypass flow fraction  mbypss / 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%
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1.2 Reactor vessel
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1.2 Reactor vessel: irradiation specimen (Nil-ductility transition T)
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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
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1.3 Reactor core and fuel assembly
core and fuel
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1.3 Reactor core and fuel assembly
Assembly
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1.3 Reactor core and fuel assembly
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1.3 Reactor core and fuel assembly
Assembly(PLUS7)
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1.3 Reactor core and fuel assembly
Assembly(PLUS7)
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1.3 Reactor core and fuel assembly
Assembly
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1.3 Reactor core and fuel assembly
Spacer grid
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1.3 Reactor core and fuel assembly
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1.4 Rod cluster control assembly
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