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MHI Receives Order for Pressurizer Nozzle Spool Piece Replacement on Ringhals Unit-3 at Ringhals Nuclear Power Plant in Sweden

Higher Corrosion Resistance to Further Enhance Plant Reliability

Tokyo, Feb 19, 2014 - (JCN Newswire) - Mitsubishi Heavy Industries, Ltd. (MHI) has received an order for pressurizer nozzle spool piece replacement work on the Ringhals 3 reactor at the Ringhals Nuclear Power Plant in Sweden. Pressurizer is a core component of pressurized water reactor (PWR) nuclear power plants, and the replacement work will enhance operating reliability through the use of more corrosion-resistant alloys in critical weld joints. The replacement work is scheduled for completion in 2016.

Ringhals Nuclear Power Plant is located 60 kilometers south of Gothenburg (Goteborg), Sweden's second-largest industrial city. The plant consists of four reactors, of which three (Ringhals 2, 3 and 4) are PWR. Ringhals 3, a 1,069 MWe (megawatt electrical) PWR, went on-stream in 1981.

Under the terms of the order, MHI will perform technical justification, qualification tests, equipment manufacturing, material procurements and replacement work at the Ringhals site. As part of the replacement work, MHI will replace six nozzle weld, including the safety and relief valve lines. Joints in the new spool piece will be constructed of Alloy 690 material that ensures higher corrosion resistance in high-temperature and high-pressure environments than Alloy 600 material used in the current weld joints.

As nozzle spool piece replacement entails work in a narrow, enclosed workspace subject to high radiation doses, MHI will dispatch skilled engineers with extensive experience in working under such conditions. In MHI's nuclear business, it will be the first such on-site replacement work to be performed in Europe.

Pressurizers are key components of PWR reactor coolant systems, and serve to maintain the pressure of reactor-related systems at constant levels. In recent years, many nuclear power plant operators in Japan, the U.S., and some European countries have begun to replace steam generators, reactor vessel heads, pressurizers, and other related components to reduce the risks associated with stress-corrosion cracking (SCC) of aging materials, and thereby enhance plant reliability and operational life. The replacement work at Ringhals 3 is in line with this trend.

Ringhals AB is an affiliate of Vattenfall AB, a company established in 1992 through the transformation of Sweden's state power enterprise into a limited liability company. MHI has previously delivered three replacement reactor vessel closure heads (RRVCHs) and replacement control rod drive mechanisms (CRDM) to Ringhals. MHI believes that the new order was awarded to it in recognition of MHI's outstanding experience in more than 20 replacement works of pressurizer nozzle spool piece replacement at PWRs in Japan, as well as its outstanding technological expertise and track record for punctual delivery and reliability in work performed on Ringhals projects in the past.

As a leading supplier of PWR nuclear power plant components, MHI will continue to contribute to the safety and stability of electricity supplies by aggressively exploring business opportunities in component and part replacement projects at existing nuclear power plants in Japan and other countries.

About Mitsubishi Heavy Industries

Since its foundation in 1884, Mitsubishi Heavy Industries (MHI) has sought pioneering new monodzukuri (manufacturing) techniques, building the foundations for the development of the entire industry. Today, with environmental and energy issues to the fore, MHI provides people around the world with eco-friendly products, and contributes to society through its involvement in global infrastructure projects and other business activities. For more information, please visit the MHI website at www.mhi.co.jp.



Source: Mitsubishi Heavy Industries

Contact:
Mitsubishi Heavy Industries
Hideo Ikuno
[email protected]
+81-3-6716-5277


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