Reactor internals design

Reactor Internals Design
Faculty of Mechanical Engineering
Ljubljana University (May 30, 2019)

Korea Atomic Energy Research Institute
Kyeong-Hoon Jeong

1


Hydro Electric Power Plant in My Home Town

Chilbo Hydroelectric Power Plant
Constructed in1945, Net Capacity : 30MWe
3% of Korean Standard Nuclear Power Plant Single Unit
2% of Korea APR1400 Single Unit
2


Korean Commercial Nuclear Power Plants in Operation
Reactor
Kori 1, 2

Type

Net capacity

Supplier

PWR

563 MWe
612 MWe

Westinghouse (USA)

Operation
4/78 ~ 6/17
7/83

Kori Unit 2 is a sister plant of Krško nuclear power plant in Slovenia. This plant is more advanced
plant than Kori Unit 2 nevertheless its operation on Jan. 1983.
Wolsung 1

4/83, Shutdown for
Estimation of
Life Extension

PHWR (CANDU)

629 MWe

AECL (Canada)

Kori 3, 4

PWR

903 MWe

Westinghouse (USA)

9/85, 4/86

Hanbit 1, 2

PWR

900 MWe

Westinghouse (USA)

8/86, 6/87

Hanul 1, 2

PWR

920 MWe

Framtome (France)

9/88, 9/89

Hanbit 3, 4

PWR (OPR)

950 MWe

Wolsung 2, 3,

4

PHWR (CANDU)

650 MWe

Hanul 3, 4, 5,
6

PWR (OPR)

960 MWe

Hanjung,
6/98, 6/99,
KOPEC, KAERI (Korea) 1/04, 12/04

Hanbit 5, 6

PWR (OPR)

950 MWe

Doosan, KOPEC (Korea)

5/02, 12/02

Shin Kori 1,2

PWR (OPR)

950 MWe

Doosan, KOPEC (Korea)

2/11, 3/12

Hanjung, KAERI (Korea)
12/95, 3/96
CE (USA)
Hanjung (Korea)
AECL (Canada)

6/97, 6/98 , 6/99

3


Korean Nuclear Power Plants under Construction or on Order

Reactor

Type

Net capacity

Start-up

Shin Wolsung 1, 2

PWR (OPR)

950 MWe

3/12, 1/13

Shin Kori 3, 4

PWR (APR)

1350 MWe

3/16, 9/18

Shin Hanul 1, 2

PWR (APR)

1350 MWe

Under Test

Shin Kori 5, 6

PWR (APR)

1350 MWe

Under Construction

Shin Hanul 3, 4

PWR (APR)

1350 MWe

Suspended

Total
(24 plants in operation)

22,500 MWe

17.5% in Total
Electric Power
Production (2018)

4


Nuclear Power Plant

Reactor Types

PWR : Pressurized Water Reactor
BWR : Boiled Water Reactor
PHWR (CANDU) : Pressurized Heavy Water Reactor
Graphite Moderated Reactor (PBMR)
5

CANDU Reactor

 Natural uranium
(0.7% U-235 + 99.3% U-238)
 Zirconium alloy cladding
 Heavy water (D20) moderator

6


Nuclear Steam Supply System

 WH-type
 Krško NPP
7


Nuclear Steam Supply System

8


Nuclear Steam Supply System

 Manufacturing
Cost
 Transportation
 Structural Integrity
of Reactor Vessel

9


Nuclear Steam Supply System

 Nozzle /Fuel
Location
 ICI Locations
 Hot Leg & Cold
Leg Change??

10


Main Components of NSSS
Reactor
Steam
Generator

11


Manufacturing of Reactor Pressure Vessel

reactor vessel forging.mp4

 Key for Operating Life Extension of NPP
 Krško NNP (40+10+10)
 Exchange MCP & SG, PZR, Closer Header

 Degradation of RV by Increase of Brittleness due to
Irradiation, Impurity Control
 Surveillance Program – Charpy Specimens
 What does NPP capacity decide?
 Manufacturing Equipment for Forging, Heat
Treatment, Handling
 Transportation and Handling in Construction Site

12


Main Components of NSSS
Pressurizer

Reactor Coolant Pump

13


Reactor Vessel Assembly and Fuel Assembly

 300°C Tem.
 15 MPa Press.

 Initial Heating ??
 Why 300°C ??
 Why 15 MPa ??

 Natural Uranium
(Approximate 4%~5% U-235 + U-238)

14


Westinghouse Reactor Vessel Assembly and Fuel Assembly

15


Comparison of Fuel Assembly

CE Type

WH Type
16


Fuel Assembly and Control Element Assembly

17


Control Element Assembly of CE Type

18


Arrangement of Control Element Assembly in Core (1)

19

Arrangement of Control Rod Assembly in Core (2)

20