# Is Doosan Enerbility Cementing Its Place in China's CAP1400 Supply Chain?

Eight forged components. Five metres in diameter. Up to 130 tonnes each. Doosan Enerbility has secured a contract with Dongfang Electric International and Dongfang Heavy Machinery — both subsidiaries of Dongfang Electric Group — to supply four channel heads and four tube sheets for steam generators at units 5 and 6 of China's Laiyang nuclear power plant in Shandong Province. Delivery is scheduled by 2029.

The deal is the South Korean manufacturer's second consecutive order for Laiyang. Last year, Doosan Enerbility announced a contract to supply the identical forged components for Laiyang units 3 and 4. Before that, the company supplied steam generator forgings for the Haiyang plant, also in Shandong, which runs [Westinghouse Electric Company](https://smrintel.com/companies/westinghouse) AP1000 reactors. Taken together, this represents a deepening commercial relationship between Doosan's Changwon forging plant and China's state nuclear build programme — one that now spans multiple sites and multiple reactor generations.

The Laiyang plant is an State Power Investment Corporation (SPIC) project. Units 5 and 6 will be Guohe One (CAP1400) reactors — China's domestically developed design based on an enlarged CAP1000 PWR, which itself derives from the AP1000. The construction of those two units was among eight reactors approved at a State Council executive meeting chaired by Premier Li Qiang on 31 July this year, meaning the ink on the government approval is less than three weeks old. SPIC holds full responsibility for investment, construction, and operation of the Laiyang project, which is ultimately planned for six CAP1400 units.

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## What Doosan Is Actually Supplying

Channel heads and tube sheets sit at the heart of a nuclear steam generator's pressure boundary. Channel heads — the large hemispherical or elliptical forgings at the primary-side end of the steam generator — must withstand reactor coolant at full system pressure and temperature while maintaining dimensional tolerances tight enough to ensure reliable tube-to-tubesheet welds. At 5 metres in diameter and up to 130 tonnes, these are among the largest precision forgings in commercial nuclear manufacturing.

Doosan attributes its ability to produce components at this scale to its 17,000-tonne press at the Changwon headquarters forging plant. Press capacity is a genuine supply-chain bottleneck in nuclear manufacturing globally; only a handful of facilities worldwide can produce forgings of this size to nuclear quality standards. That scarcity is precisely why consecutive contract wins matter commercially — it signals that Chinese procurement teams, with no shortage of domestic industrial options, continue to qualify Doosan as a preferred supplier for the most dimensionally demanding components.

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## The CAP1400 Ramp and Its Supply Chain Implications

China's approval of eight new units on 31 July represents the continued acceleration of its nuclear build programme. The CAP1400 — branded Guohe One domestically — is the flagship large reactor design for this expansion wave. It is a third-generation PWR with passive safety systems, and while it shares AP1000 heritage through the CAP1000 lineage, the CAP1400 is a substantially larger machine. That scale-up means component sizes increase accordingly, which narrows the qualified supplier pool.

For Doosan Enerbility, consecutive awards across Laiyang units 3/4 and now 5/6 suggest the company has achieved preferred-supplier status for Guohe One steam generator forgings — at least for this project. Whether that extends to other CAP1400 sites in China's pipeline is the commercial question worth watching.

The broader supply-chain angle is significant for the global nuclear industry. As Western reactor programmes — including potential AP1000 builds and various SMR projects — scale up over the next decade, the same forging capacity constraints that make Doosan's Changwon press valuable will apply. A company that demonstrates sustained quality delivery at the 130-tonne scale for Chinese customers is building a reference record it can use in competitive bids elsewhere.

CEO Jongdoo Kim framed it plainly in a statement: "This consecutive order for Laiyang units 5 and 6 is particularly meaningful, as it reaffirms the recognition of our technological and quality competitiveness in China's nuclear power market."

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## Skeptical Read: What This Contract Doesn't Tell Us

The contract value is not disclosed. Without knowing the commercial terms, it is impossible to assess the margin profile or whether Doosan is pricing aggressively to maintain market share against domestic Chinese forging competitors who are themselves investing in heavy manufacturing capacity. China's domestic heavy forging industry has matured significantly over the past decade, and the long-term assumption that international suppliers will retain preferred status at Chinese nuclear sites is not guaranteed.

Additionally, geopolitical risk is a standing factor in any South Korea–China industrial relationship. Trade tensions, export control regimes, or shifts in China's localisation policy could affect the duration of Doosan's position in this supply chain — irrespective of technical performance.

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## Key Takeaways

- Doosan Enerbility will deliver **eight forged components** — four channel heads and four tube sheets — for steam generators at Laiyang units 5 and 6, by **2029**
- Components measure **5 metres in diameter** and weigh up to **130 tonnes**, manufactured on Doosan's **17,000-tonne press** at Changwon
- The contract counterparties are **Dongfang Electric International** and **Dongfang Heavy Machinery**, subsidiaries of Dongfang Electric Group
- Laiyang 5 and 6 will be **Guohe One (CAP1400)** reactors — China's domestically developed large PWR derived from the AP1000 lineage
- The Laiyang build was among **eight units approved** at a Chinese State Council meeting on **31 July 2026**
- This is Doosan's **second consecutive Laiyang order**, following a prior contract for units 3 and 4, and builds on earlier supply to the AP1000-equipped Haiyang plant in the same province
- Contract value is **not disclosed**; margin profile and long-term supplier status remain open questions

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## Frequently Asked Questions

**What are channel heads and tube sheets in a nuclear steam generator?**
Channel heads are the large forged pressure-boundary components at the primary-coolant inlet and outlet of a steam generator. Tube sheets are the thick forged plates through which thousands of heat-transfer tubes are rolled and welded. Both must meet stringent nuclear quality codes because they form part of the reactor coolant pressure boundary — the primary barrier containing radioactive coolant.

**What is the Guohe One (CAP1400) reactor?**
Guohe One is China's third-generation pressurised water reactor design, developed by State Power Investment Corporation. It is an enlarged derivative of the CAP1000 PWR, which itself was developed from the Westinghouse AP1000 under a technology transfer agreement. The CAP1400 uses passive safety systems similar to its AP1000 heritage but operates at higher power output.

**Why does press capacity matter for nuclear forgings?**
Ultra-large nuclear forgings require hydraulic forging presses capable of applying thousands of tonnes of force to shape and refine grain structure in thick steel billets. Only a small number of facilities worldwide — including Doosan's 17,000-tonne press at Changwon — can produce forgings at the scale required for large reactor pressure vessels and steam generators. This capacity constraint makes qualified forging suppliers a genuine bottleneck in global nuclear supply chains.

**How many CAP1400 units are planned for Laiyang?**
According to the source, the Laiyang plant is ultimately planned for six CAP1400 units. Construction of units 5 and 6 was among eight reactors approved at a State Council executive meeting on 31 July 2026. Doosan already holds contracts for units 3, 4, 5, and 6.

**Does Doosan Enerbility supply forgings to non-Chinese nuclear projects?**
The company describes itself as a supplier of major nuclear power components to the global market, citing its Changwon forging capabilities. The source material specifically references Chinese projects — Laiyang and Haiyang — as current examples, but does not enumerate other active international contracts.