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RADIOACTIVE DECONTAMINATION

Decommissioning plan of NPP in Korea

Operating Under construction Planning Total
23 5 4 32
Name of Plant Started Stop Remarks
Kori 1 1978 2017 30 years Design life is reached Additional operation 10 years / Decommissioning
Wolsong 1 1983 2022 30 years Design life is reached Additional operation 10 years
Wolsong 2 and others 3 After 1997 2027 30 years Design life
Kori 3 and other 18 After 1986 2026 40 years Design life

· The nuclear decommissioning market is estimated at KRW 14 trillion

- Currently operation 23 nuclear power plants (IAEA PRIS)

- Cost of decommissioning per a plant : KRW 640 billon ~ 1trillion(2014 Ministry of Commerce, Industry and Energy

(2017)

Radioactive decommissioning

Kori Unit 1 is 587MWe PWR Intermediate and low level radioactive waste at decommissioning is estimated to be 14,500 drums (280kg/drum, estimated 3,900ton, 04” Nuclear Advanced Research Center

Decommissioning nuclear facilities using power manipulation equipment such as Power Manipulator A1000 or TELBOT

After cutting, decontaminate and classify buildings and machinery seqmentations, and then permanently store in dedicated containers

Benefits of radioactive decontamination

01

The radioactive level can be lowered through decontamination, so that the damage caused by the leakage of the radioactive material can be minimized.

02

Waste management is facilitated by lowering radiation level

03

Reduction of radiation exposure received during decomissioning work can be done safely

04

Systems and equipment can be reused

Comparison of decontamination methods

Decontamination Method Advantages Disadvantages
Chemical decontamination
(wet)
Process is fast and simple Massive secondary liquid waste generation
Low initial cost Use toxic chemicals
Various structural decontamination Expansion of second polluted area
Dry ice decontamination
(dry)
No secondary waste Dry ice facility required
Efficient decontamination No complicated structure decontamination
Advantageous for decontaminating porous materials Need consumable goods
Applicable for all surfaces Somewhat long working time

Dry ice decontamination robot

· Decontamination robot currently in operation at nuclear power plant

· Performing decontamination by moving under the reactor

· The operator checks the cleaning area through the camera of the decontamination robot from the outside

· The nozzles can rotate at various angles and can decontaminate without blind spot

Concept design of Decontamination and decommissioning robots

1
Decontamination Tool (Laser & C02 jet)
2
Live Camera
3
C02 Storage Tank
4
Tool Box
5
Filtering System
6
Exchangeable Power Supply
7
Dual Manipulator
8
Flexible Driving Vehicle
9
Radiation Detector Tool

Spent Nuclear Fuel

Uranium fuel used for nuclear power generation has high heat and radioactivity, so it must be managed safely so that it does not leak out.

Status of Spent Nuclear Fuel Storage by Nuclear Power Plant

Division Capacity Storage amount Saturation rate Expected saturation year
Light water reactor Hanbit 9017 5693 63.10 % 2024년
Kori 6494 5612 86.40 % 2024년
Hanul 7066 4855 68.70 % 2037년
New Wolsung 1046 129 12.30 % 2038년
Heavy water reactor Wolsung 49만 9632 40만 8797 81.80 % 2019년
Reaearch Hanaro 1032 502 48.60 % 2028년

2015 / bunch / Ministry of Commerce, Industry and Energy

The importance of spent fuel handling technology is increasing when considering the spent fuel saturation rate and the closure of Kori Unit 1.

Spent Nuclear Fuel

On November 6, 2017, VICTEX signed a contract to transfer core technology for handling spent nuclear fuel to Korea Atomic Energy Corporation (KORAD).

Technology Transfer Agreements

Number Patent number Patent
1 10-1303085 Metal containers for transporting or storing spent Nuclear fuel
2 10-1444706 Spent nuclear fuel container lifting device
3 10-1559300 Canister transfer container for spent nuclear fuel storage
4 10-1488614 Spent nuclear fuel test equipment
5 10-1558963 Spent nuclear fuel container structure test equipment
6 10-1645644 Conductivity test equipment of spent nuclear fuel container
7 10-1333066 Concrete containers for spent nuclear fuel transportation or storage
8 10-1575118 Spent nuclear fuel concrete conductivity tester
9 10-1603603 Spent nuclear fuel concrete tank earthquake test equipment

This technology is the first technology in Korea that can be used for storing spent nuclear fuel. This technology confirmed safety through empirical tests such as earthquake, fire, falling, and aircraft collision.