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Zhongtong Steel Structure: The pre-assembly of the No. 2 ring beam for Haiyang Nuclear Power has been successfully completed.

2018/11/14 08:33

In 2014, Zhongtong Steel Structure Company adhered to the quality philosophy of the nuclear power system, which emphasizes "everything has rules to follow, someone is responsible, someone supervises, and everything is traceable" in its diligent work. For most people in the workshop, "nuclear power" is both profound and attractive; it is profound in its uniqueness and attractive in its exclusivity. This curiosity, akin to half-concealing a pipa, has laid a humble and eager-to-learn work atmosphere for the next steps, and has also provided personnel support for the production of the dome ring beam of Haiyang Nuclear Power Unit 2. The dome ring beam of Haiyang Nuclear Power is composed of wing plates of 57.1mm and web plates of 38mm, which are assembled and welded together.
Zhongtong Steel Structure: The pre-assembly of the No. 2 ring beam for Haiyang Nuclear Power has been successfully completed.

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In 2014, Zhongtong Steel Structure Company adhered to the nuclear power system quality concept of "everything has rules to follow, someone is responsible, someone supervises, and everything can be verified" to carry out diligent work. For most people in the workshop, "nuclear power" is both profound and attractive; it is profound in its uniqueness and attractive in its exclusivity. This curiosity, akin to half-concealing a pipa, laid a humble and eager-to-learn working atmosphere for the next steps, and also provided personnel support for the production of the Haiyang Nuclear Power Unit 2 dome ring beam. The overall dome ring beam is composed of wing plates of 57.1mm and web plates of 38mm, welded together to form a circle with a diameter of 10362mm. The dimensional tolerance requirement is within ±1.6mm, and the welding NDE inspection must meet the AWS acceptance standards for nuclear-grade welds. Both the component dimensions and internal flaw detection requirements have reached a very high standard. To meet the quality acceptance standards of the nuclear power system, all employees of the nuclear power project combined their past experiences, innovated work ideas, and further optimized the assembly and welding processes to ensure that the components meet the acceptance standards.

The processing of the entire dome has very strict requirements for the welding process. Due to the unique requirements of the nuclear power system, the welders must obtain the American AWS welding qualification certificate to operate. All welds on the ring beam are nuclear-grade full penetration welds, with welding inspection requirements of 100% VT + 100 MT for every 1/4 layer of deposited metal thickness; after all welding is completed, it is followed by: 100% VT + 100 MT + 100% UT. In the production process, the most challenging aspect is the 100% inspection of nuclear-grade full penetration welds (CJP), which are not only thick but also long (nearly 70 meters in total length). The 100% UT inspection of the Haiyang Nuclear Power Unit 2 dome ring beam passed all at once, which is the result of the joint efforts of all employees in Zhongtong Steel Structure Company's nuclear power project. This also ensured the steady improvement of Zhongtong Steel Structure's welding technology level, while also creating a unique "steel structure style" that belongs to Zhongtong. This is yet another successful example of Zhongtong Steel Structure in the technology, large components, and complex components pre-assembly.

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