Radioactive Waste Management — WIA-ENE-026
This chapter anchors long-term stewardship (LTS) over 100-10,000 year horizons in IAEA GSR Part 6 (Decommissioning of Facilities) §6, IAEA SSR-5 (Disposal of Radioactive Waste) §3.32, and the OECD/NEA The Roles, Responsibilities, and Future Demands of Long-Term Stewardship report. The WIA-ENE-026 standard wraps post-closure stewardship of sites, records, financial assurance, and intergenerational responsibility transfer inside a single envelope class, LongTermStewardshipRecord, so that operators maintain identical traceability across IAEA Joint Convention reports, the OECD/NEA NEWMDB database, and domestic regulators.
Long-term stewardship consists of four core obligations: (1) Physical Preservation — site boundary integrity, intrusion deterrence, monitoring, (2) Records Preservation — permanent custody of inventory, site coordinates, and safety assessment results, (3) Financial Assurance — funding for future monitoring, remediation, and restoration, and (4) Knowledge Transfer — intergenerational transfer of technical and institutional knowledge. The WIA-ENE-026 envelope stewardshipDimension field encodes the four as an enum (PHYSICAL/RECORDS/FINANCIAL/KNOWLEDGE), and the reference simulator panel 3 (Repository Capacity) computes per-site LTS maturity automatically.
IAEA SSR-5 §3.32 recommends three control phases after repository closure: (i) Active Institutional Control — monitoring, maintenance, access control over 100-300 years, (ii) Passive Institutional Control — records preservation, markers, generational information transfer over 300-10,000 years, and (iii) Post-Institutional Control — reliance on natural barriers beyond 10,000 years. The WIA envelope institutionalControlPhase field carries these as an enum.
The OECD/NEA The Roles, Responsibilities, and Future Demands of Long-Term Stewardship (2007) defines 12 governance elements: (1) responsible party, (2) funding mechanism, (3) monitoring procedure, (4) records management, (5) land-use restrictions, (6) access control, (7) corrective actions, (8) information disclosure, (9) knowledge preservation, (10) risk communication, (11) international cooperation, and (12) intergenerational equity. The WIA-ENE-026 Phase 2 endpoint /lts/governance/audit scores an operator's LTS governance against these 12 elements.
WIPP (Waste Isolation Pilot Plant, New Mexico, United States, operational 1999) is the canonical LTS case. WIPP operates a 10,000-year post-closure suite: (a) layered marker system — granite obelisks, ceramic markers, scenic-area signs, (b) US DOE permanent records archive, (c) Nuclear Waste Fund (a federal trust), and (d) permanent land-use restriction encumbrance. The simulator panel 3 (Repository Capacity) compares the LTS governance index of WIPP, Finland's Onkalo, Sweden's SKB Forsmark, and Korea's Gyeongju as a time series.
Long-term records preservation covers four dimensions: (a) Media Durability, (b) Format Migration, (c) Semantic Preservation, and (d) Access Control. The OECD/NEA Records, Knowledge and Memory (RK&M) Initiative developed standard procedures from 2011-2019, and ISO 14721 (OAIS, Open Archival Information System Reference Model) provides the digital preservation reference. The WIA-ENE-026 envelope recordsRetention field encodes the ISO 14721 five-tier model (SIP/AIP/DIP/AIU/AIC) as an enum.
Long-term records do not rely on a single medium. WIPP adopts a five-medium strategy: (a) clay tablets and ceramic markers — 10,000-year durability, (b) granite obelisks — 100,000-year durability, (c) paper archives — 100-300 years (acid versus acid-free), (d) microfilm — 500-1,000 years, and (e) digital repositories — with 5-10 year migration cycles. KORAD's Gyeongju repository in Korea operates a four-medium strategy ((a)+(c)+(d)+(e)) and is evaluating (b) granite markers for 2024 onwards.
The OECD/NEA RK&M Initiative developed the KEEP standard, which standardises six core knowledge elements: (i) site identifier (geographic + cartographic), (ii) waste type and quantity, (iii) radionuclide inventory (Bq), (iv) package type, (v) barrier system design, and (vi) safety assessment results. The WIA-ENE-026 Phase 2 endpoint /lts/keep/export produces a KEEP-format XML document from repository metadata.
IAEA GSR Part 6 §6.10 recommends four post-closure financial assurance mechanisms: (a) Sinking Fund — accumulation during operation, (b) Trust Fund — independent trust, (c) Surety Bond, and (d) State Guarantee. Korea operates the triple combination (a)+(b)+(d): KHNP's decommissioning fund (KRW 872.6 billion per reactor, 2020 baseline), KORAD's spent fuel management fund (KRW 400 million per drum), and the government's final responsibility (Article 30 of the High-Level Special Act — "the State's ultimate obligation").
The OECD/NEA Financial Aspects of Decommissioning (2016) report compares member-state decommissioning funds. The average per-unit fund is $635M in the US, €280M in France, and £1.2B in the UK (2020 USD: $640M, $330M, $1.55B). Korea's KRW 872.6 billion (≈ $730M) sits above the OECD average. Spent-fuel permanent disposal cost is separate, and the High-Level Special Act estimates a cumulative cost of KRW 53 trillion through the 2050s.
ICRP Publication 81 (Radiation Protection Recommendations as Applied to the Disposal of Long-Lived Solid Radioactive Waste) and the OECD/NEA The Environmental and Ethical Basis of Geological Disposal (1995) align three intergenerational equity principles: the current generation must not (i) transfer burdens to future generations, (ii) preclude future generations from participating in decisions, or (iii) deprive future generations of information access. The WIA-ENE-026 envelope equityCompliance field encodes the three principles as an enum.
International cooperation on long-term stewardship centres on (a) the IAEA Joint Convention on Spent Fuel and Radioactive Waste Safety (adopted 1997, 88 contracting parties), (b) the OECD/NEA NEWMDB (Net Enabled Waste Management Database, operational since 1995), and (c) IAEA SLOWPOKE (Site, Land, Operational Waste Patterns and Knowledge Exchange) workshops. Korea signed the Joint Convention in 1997 and ratified in 2002; KORAD is the Korean NEWMDB focal point. The WIA Phase 3 §3 federation handshake automates NEWMDB updates.
/lts/governance/audit./lts/keep/export.https://github.com/WIA-Official/wia-standards-public/tree/main/radioactive-waste.Korea's long-term stewardship framework rests on a four-layer legal structure: (1) the Radioactive Waste Management Act (enacted 2008, fully revised 2017), (2) the High-Level Radioactive Waste Management Special Act (enacted 9 January 2024, effective 12 July 2024), (3) Articles 85-96 of the Nuclear Safety Act (waste procedures), and (4) the National Finance Act (fund management). KORAD operates the low- and intermediate-level repository at Gyeongju and interim storage of spent nuclear fuel; KHNP is the waste-generating operator, KINS provides safety verification, and NSSC issues licensing decisions.
The Gyeongju repository began Stage 1 cavern operation (100,000 drums) in December 2014 and received Stage 2 surface-trench licensing (additional 125,000 drums) in December 2019, for a total of 225,000 drums. Post-closure active institutional control spans 100 years (2014 + 100 = 2114) and passive control extends another 200 years (2114 + 200 = 2314), aligned with IAEA SSR-5 §3.32. Post-closure monitoring follows NSSC Notice 2014-3, with 30-year-cycle safety reassessment.
The spent-fuel permanent repository (High-Level) proceeds under the 2024 Special Act over a 36-year timeline: site feasibility 13 years (2024-2037), site fixation 2 years (2037-2039), interim storage construction 7 years (2039-2046), and permanent disposal construction 14 years (2046-2060). Article 30 codifies the State's ultimate obligation, mirroring the OECD/NEA "State Guarantee" mechanism. Financial assurance is a triple structure: KHNP's decommissioning fund (KRW 872.6 billion per unit, KRW 22.7 trillion across 26 units), KORAD's spent fuel management fund (KRW 400 million per drum, cumulative KRW 18 trillion as of 2024), and the government's additional contributions under the 2024 Act (estimated cumulative KRW 53 trillion through 2060).
This chapter, like every other Phase 1-4 chapter in the Radioactive Waste Management eBook, composes with the wider WIA Standards family. Implementations that adopt the long-term stewardship envelope reuse the cross-standard audit transport (W3C Trace Context plus OpenTelemetry semantic conventions), the cross-standard identity (WIA-OMNI-API), and the cross-standard runtime trust list (WIA-AIR-SHIELD) without per-standard re-implementation. WIA-INTENT declares stewardship intent (e.g., "Gyeongju Stage 1 entering 100-year post-closure control"), and WIA Secure Enclave wraps repository inventories and site coordinates in sealed envelopes. The Phase 3 §3 federation handshake lets the 88 contracting parties of the IAEA Joint Convention subscribe to LTS stage transition events in real time. With this chapter, the eight-chapter arc of the Radioactive Waste Management eBook completes, and the composition pattern with the WIA Standards family (WIA-OMNI-API, WIA-AIR-SHIELD, WIA-INTENT, WIA Secure Enclave) is consistent across every chapter.
Korea's long-term stewardship financial assurance is a triple structure: (1) KHNP's per-unit decommissioning fund — KRW 872.6 billion per unit (2020 baseline), KRW 22.7 trillion across 26 units, (2) KORAD's spent fuel management fund — KRW 400 million per drum (charged to KHNP based on generation), cumulating to KRW 18.0 trillion by 2024, and (3) the government's additional contributions under the 2024 High-Level Special Act — estimated cumulative KRW 53 trillion across the 36-year horizon from site feasibility study to permanent disposal operation. The total assurance pool reaches approximately KRW 93.7 trillion, or KRW 1.87 million per capita.
This financial scale corresponds to approximately 3.8% of GDP per capita among OECD members, comparable to Finland (4.2%, Posiva), Sweden (3.5%, SKB), and Canada (2.9%, NWMO). However, with 26 reactor units and approximately 18,000 tonnes of cumulative spent nuclear fuel (as of 2024) needing accommodation in a single repository, Korea's per-m³ disposal cost is estimated at approximately 1.3 times the Finnish Onkalo (€640/m³) and Swedish SKB (€720/m³) levels. The Korea Institute of Geoscience and Mineral Resources (KIGAM) and the KURT (KAERI Underground Research Tunnel) facility at the KAERI main campus in Daejeon accumulate repository design data at 80-120 m depth in granite.
The intergenerational equity principle (ICRP Publication 81 plus OECD/NEA The Environmental and Ethical Basis of Geological Disposal) carries four implications in the Korean context: (i) no transfer of burden to future generations → mandatory permanent disposal operation after the 36-year schedule, (ii) no deprivation of future generations' decision-making opportunities → mandatory citizen participation at each stage of the 13-year feasibility study, (iii) guaranteed information access for future generations → KORAD quarterly data disclosure and permanent records archive at the National Archives of Korea (NAK) Busan branch, and (iv) no preclusion of future spent-fuel reuse options → the reprocessing versus direct disposal choice is to be decided during the feasibility study stage.
The 10,000-year WIPP long-term marker system (New Mexico, US) is the reference model for Korea's Gyeongju closure marker design. WIPP operates a four-tier marker system: (a) sixteen 25-m granite obelisks inside the perimeter plus nine outside, with UV-facing hazard warnings in nine languages (English, Spanish, Russian, Chinese, Arabic, French, Navajo, Egyptian hieroglyphic, pictogram), (b) a clay tablet archive buried 1 km away, (c) outlying granite markers at four points within 50 km radius, and (d) National Archives permanent storage plus a UNESCO Memory of the World inscription candidacy. Korea's Gyeongju repository launched Stage 1 of a Long-Term Marker System Feasibility Study in 2024.
For international cooperation, Korea signed the 1997 IAEA Joint Convention on Spent Fuel and Radioactive Waste Safety and ratified in 2002, with KORAD serving as the Korean NEWMDB (Net Enabled Waste Management Database) focal point. For the 8th Review Meeting in 2024, Korea submitted a 165-page national report jointly authored by KORAD, KINS, NSSC, and MOTIE, undergoing peer review by 88 contracting parties. The 2017 and 2023 ARTEMIS review reports rated Korea's LTS governance above the OECD average, particularly citing (2) funding mechanisms, (8) information disclosure, and (11) international cooperation among the 12 governance elements.
The core challenges for Korean long-term stewardship are fourfold: (1) sustaining citizen trust through the 13-year site selection schedule, (2) ongoing National Assembly approval of the KRW 53 trillion supplementary government contribution, (3) completion of permanent disposal technology R&D for 18,000 tonnes of spent nuclear fuel, and (4) building a multilateral cooperation framework with neighbouring states (Japan NRA, China NEA, Russia Rosatom). The simulator panel 3 (Repository Capacity) compares the LTS governance index of Korea's Gyeongju (low- and intermediate-level) and the future High-Level repository against Finland's Onkalo, Sweden's SKB, and the US WIPP in time series. With this chapter, the eight-chapter arc of the Radioactive Waste Management eBook completes, confirming that the WIA-ENE-026 standard unifies international standards (IAEA, OECD/NEA, ICRP) and domestic laws (Korea Nuclear Safety Act, Radioactive Waste Management Act, High-Level Special Act) inside a single envelope.
The Korean spent-fuel permanent disposal 36-year schedule (2024-2060) is structured in four phases: (1) site feasibility study 13 years (2024-2037), (2) site fixation 2 years (2037-2039), (3) interim storage construction 7 years (2039-2046), and (4) permanent disposal construction 14 years (2046-2060). Each phase is codified in the addendum to the 2024 High-Level Special Act, with MOTIE, MSIT, the Ministry of Environment, and the Ministry of Land as co-competent ministries. NSSC handles safety regulation, KINS provides technical support, and KAERI leads R&D.
The Korea Institute of Geoscience and Mineral Resources (KIGAM) collects geological, hydrological, and seismic data over the 13-year feasibility study. Municipalities applying for the 2025 call for five candidate sites must meet criteria of granite bedrock (approximately 35% of Korean territory), population density below 100/km², and coastal or near-coastal location (for waste transport ease). The KURT (KAERI Underground Research Tunnel) facility at the KAERI Daejeon main campus accumulates granite-repository safety assessment data at 80-120 m depth, sharing data through international cooperation agreements with Finland's ONKALO (Posiva), Sweden's Äspö HRL, and Japan's Mizunami URL.
The National Archives of Korea (NAK) Busan branch serves as Korea's permanent records archive and received ISO 14721 OAIS conformance certification in 2014. KORAD maintains Gyeongju repository inventory, environmental monitoring, and safety assessment records across three media: (a) paper publications (quarterly), (b) microfilm (annual refresh), and (c) digital repository (real-time). KORAD has updated the OECD/NEA NEWMDB Korean focal point quarterly since 2024. For the future High-Level repository (2060 operation), KORAD is evaluating (d) granite markers following the WIPP model.
Korean LTS governance progress against the 12 OECD/NEA (2007) elements: (1) responsible party — government, KORAD, KHNP responsibilities codified, (2) funding mechanism — triple structure (decommissioning fund, spent fuel fund, government supplement), (3) monitoring — KORAD quarterly with KINS cross-validation, (4) records management — NAK Busan branch permanent custody, (5) land-use restriction — 5 km radius encumbrance around Gyeongju, (6) access control — 24-hour security, (7) corrective actions — NSSC 30-year-cycle reassessment, (8) information disclosure — KORAD quarterly reports, (9) knowledge preservation — KAERI R&D continuity, (10) risk communication — KFRS programmes, (11) international cooperation — IAEA Joint Convention and OECD/NEA NEWMDB, (12) intergenerational equity — Article 30 of the Special Act on the State's ultimate obligation. The 2023 ARTEMIS review rated all 12 elements above the OECD average.