MHI Completes Replacement Work on Reactor Vessel Head at Nuclear Power Plant in
- Company's First Component Replacement Job for Overseas NPP -
Tokyo, Mar 12, 2013 - (JCN Newswire) - Mitsubishi Heavy Industries, Ltd. (MHI)
has completed work to replace the reactor vessel head (RVH) at Angra 1, a
pressurized water reactor (PWR) nuclear power plant (NPP) owned by Eletrobras
Termonuclear S.A. (Eletronuclear), a government-controlled electricity company
in Brazil. The event marks the first large-scale component replacement with
installation undertaken by MHI for a NPP overseas.
The work performed by MHI was to replace the NPP's existing components
with a new RVH and control rod drive mechanisms (CRDM) - huge components that
form the closure head of the nuclear vessel, both delivered by MHI in April
2010 and August 2012, respectively. After disassembling and removing the
existing closure heads, the new RVH and CRDMs were assembled at the nuclear
reactor containment vessel and installed.
In the replacement work, MHI took charge of all coordination details.
Disassembly of the existing components and welding of the new CRDMs on the new
RVH and their installation in the containment vessel were performed by Aquilex
WSI of the U.S. Transco Products Inc., also of the U.S., was responsible for
production and installation of thermal insulation material. The replacement
work commenced under MHI's management in January of this year to coincide
with a periodical inspection; all tasks were successfully executed as planned
and Angra 1 was place back on line on March 6.
Eletronuclear's 657 MWe (electric megawatt) Angra 1 PWR NPP located
approximately 130 kilometers west of Rio de Janeiro, began commercial operation
in 1985. Replacement of the RVH aimed at making plant operations more reliable
Eletronuclear is a subsidiary of Centrais Eletricas Brasileiras S.A.
(Eletrobras), Brazil's main electricity corporation, in which the national
government and Banco Central do Brasil, Brazil's central bank,
collectively have a greater than 60% equity stake. Eletronuclear also owns and
operates the Angra 2 NPP, with the Angra 3 NPP currently under construction.
In Brazil, development of new energy sources and their diversification have
become major issues as the country's economy expands. As a result, at the
same time the construction of new NPPs is gathering momentum, large-size NPP
component replacements have been installed in existing plans to their extend
the operational lives.
MHI has supplied its nuclear power equipment in major NPP markets worldwide
and, to date, has exported numerous components, including 15 replacement RVH
units to the U.S. Going forward, the company will continue to contribute to
safe NPP operation and stable power supply through provision of replacement
components and maintenance technology that will help enhance the safety,
reliability and economic efficiency of such plants.
About Mitsubishi Heavy Industries
Mitsubishi Heavy Industries, Ltd. (MHI), headquartered in Tokyo, Japan, is one
of the world's leading heavy machinery manufacturers, with consolidated
sales of 2,820.9 billion yen in fiscal 2011, the year ended March 31, 2012.
MHI's diverse lineup of products and services encompasses shipbuilding,
power plants, chemical plants, environmental equipment, steel structures,
industrial and general machinery, aircraft, space rocketry and air-conditioning
systems. For more information, please visit the MHI website at www.mhi.co.jp.
Mitsubishi Heavy Industries
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