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DEEP RESEARCH · NUCLEAR TRF

Tritium Removal Technology: The Radiological Safety Valve for CANDU Life Extension

CANDU tritium buildup, TRF process engineering, the Cernavoda project, and fusion-fuel value

Written: 2025-12-20 · Nuclear life extension and isotope separation technology analysis · Naver Blog

Investment decisions are your responsibility. This material is research, not a recommendation to buy or sell.

0. Bottom line first

TRF is not merely an environmental facility; it is a radiological enabler for extending aging CANDU reactor lives. At the same time, separated tritium is being revalued as fusion fuel, creating the possibility that a former cost center becomes a strategic resource production base.

Official fact: The source gives the average tritium production rate in CANDU moderator as about 7.5 × 10¹⁰ Bq per kg of heavy water per year. A representative CANDU 6 contains about 281m³, or roughly 309,100kg, of moderator; this implies about 2.3 × 10¹⁶ Bq of tritium generated per reactor per year in the moderator system.

Interpretation: Tritium is both an operating risk and a future resource. Without removal, worker dose and environmental release risk rise; if separated and stored properly, it becomes an option in the fusion fuel supply chain.

TRF's dual roleLife extension + fusion-fuel option
CANDUD₂O moderator
TritiumBuilt up by neutron capture
TRFLPCE + cryogenic distillation
ReuseHeavy-water reuse · tritium storage
Lowering the radiological barrier creates the refurbishment window

1. CANDU and tritium buildup

Unlike light-water reactors, CANDU reactors use heavy water (D₂O) as moderator and coolant. Heavy water's low neutron absorption enables natural uranium fuel, but deuterium (²H) captures neutrons during operation and turns into tritium (³H).

ItemSource figure/contentMeaning
Production rateAbout 7.5 × 10¹⁰ Bq per kg of heavy water per yearConcentration management is essential in long-term operation
CANDU 6 moderatorAbout 281m³, about 309,100kgLarge heavy-water inventory per reactor
Annual generationAbout 2.3 × 10¹⁶ BqBuildup risk in the moderator system
Concentration gapModerator concentration at least 10x higher than heat transport systemModerator TRF is critical

2. Core mechanism for life extension

Refurbishment replaces core components such as pressure tubes and feeder pipes to extend plant life by 25-30 years. This work includes cutting and replacing pipes inside and around the calandria, one of the highest-radiation work areas.

Official fact: The source gives Wolsong's moderator tritium concentration management target as 370 GBq/kg, or 10 Ci/kg, and says this can be achieved only through TRF operation.

Interpretation: TRF's real product is workable time and space. If tritium concentration remains high, workers can reach dose limits quickly, making refurbishment physically impractical.

Worker safety

Lower occupational dose

Reduces internal dose from high-concentration tritiated vapor.

Regulatory acceptance

Minimize environmental release

Provides the technical basis for license renewal and community acceptance.

Economics

Heavy-water reuse

Detritiated heavy water can return to moderator service and reduce replacement cost.

3. Process technology: LPCE and cryogenic distillation

Modern TRF combines liquid phase catalytic exchange (LPCE) with cryogenic distillation. LPCE uses hydrophobic catalyst to trigger isotope exchange between liquid heavy water and deuterium gas, transferring tritium into gas phase.

TRF process flowHydrogen isotope separation
DTOTritiated heavy water
LPCEHydrophobic catalytic exchange
DT GasTritium transfer to gas
CryogenicDistillation and concentration
Heavy water is reused and tritium is stored or monetized

The source says older VPCE required large energy input to vaporize heavy water, while LPCE reacts in liquid state, improving energy efficiency and simplifying the process. High-performance hydrophobic catalyst developed by KAERI and others is presented as a key competitive element.

4. Market ecosystem: KHNP, Iljin Power, Kinectrics, and Veolia

The source frames TRF not as a single-company market but as an ecosystem of plant operators, EPC contractors, equipment suppliers, and original technology holders. KHNP has Wolsong TRF operating experience and the Cernavoda EPC reference; Iljin Power supplies tritium storage and processing equipment and maintenance capability.

  • KHNP: Prime contractor, overall project management, commissioning, and interface with SNN.
  • Iljin Power: Core equipment for tritium storage and processing systems, supported by long cooperation with KAERI.
  • Kinectrics and Veolia: Global technology and service providers in tritium and heavy-water treatment.
  • Other supply chain: Doosan Enerbility, Iljin Electric, and others provide BOP equipment and expand Team Korea's footprint.

5. Fusion fuel and supply cliff

Official fact: The source says ITER is expected to need about 12.3kg of tritium for full deuterium-tritium experiments in the mid-2030s. It also cites private-market tritium pricing of USD 30,000 per gram, or about KRW 40 million.

Interpretation: Operating CANDU reactors could function as commercial fuel factories for future fusion plants. If DEMO-stage reactors require tens of kilograms, supply shortage could completely change TRF economics.

Source image related to TRF and the Cernavoda project

6. Case study: Romania's Cernavoda TRF

The source views KHNP's Cernavoda TRF order as a successful model for Korean nuclear exports. The June 2023 contract is worth about KRW 260 billion, or EUR 195 million, started construction in July 2023, and targets completion in August 2027 over a 50-month period.

ItemContentStrategic meaning
Contract sizeAbout KRW 260B / EUR 195MKorean TRF EPC reference
ScheduleJuly 2023 start, August 2027 target completionLinks to Cernavoda Unit 1 refurbishment
Technology strategyAdopts LPCE technology from Romania's ICSIReduces licensing risk by respecting customer technology
Korean roleDesign optimization, procurement, and construction managementExports EPC strength and operating know-how

7. Strategic recommendations

  • Adopt a fusion-ready strategy that treats TRF as tritium production and supply infrastructure, not just removal equipment.
  • Export long-term O&M packages after EPC to improve lifetime profitability.
  • Expand hydrogen isotope separation technology into derivative markets such as high-purity hydrogen purification and SMR coolant management.
  • Work with original technology holders such as Kinectrics and ICSI to lead next-generation TRF standards.

8. Overall view

The TRF market is entering an early supercycle where current nuclear life-extension demand overlaps with future fusion-fuel demand. Korea's nuclear industry has proven competitiveness through Wolsong operating experience and the Cernavoda order. The next task is connecting that record to European refurbishment and the fusion fuel supply chain.

Sources

Naver original