Fukushima Floating Offshore Wind Farm
Demonstration Project（ Fukushima FORWARD ）- Construction of Phase II -http://www.fukushima-forward.jp

７ＭＷ floating wind turbine Fukushima Shimpuu
Fukushima

offshorewind

consortium is proceeding with
Fukushima floating offshore windfarmdemonstration
project(Fukushima FORWARD) fundedby the Ministry of Economy, Tradeand Industry.
In this project, three floating windturbines and one floating power
sub-station have been installed off
the coast of Fukushima. The firstphase of the project consists of the2MW floating wind turbine, theworld first 25MVA floating substation and submarine cable, and had
been completed in 2013. In thesecond phase the installation ofthe 7MW floating wind turbine
Fukushima
Shimpuu
wasrotor diameter : 167m, hub height : 105m,the height of the top blade : 189m
depth : 32m, draft : 17m, length : 85m, width : 150m
no. of mooring chain : 8, chain diameter : 132mm

Fukushima Floating Offshore Wind Farm Demonstration Project

５ＭＷ floating wind turbine Fukushima Hamakaze
completed in June of 2015 and the5MW floating wind turbine Fukushima Hamakaze will be installedin the summer of 2016.
This project will establish thebusiness-model of the floating
wind farm and contribute to futurecommercial projects. The consortium members are also expected tolearn know-how of floating offshore
wind farm, which will be one of themajor export industries in Japan.
The Fukushima FORWARD
project believes to help Fukushima
to become the center of new industry which will create new employment in this region to recover fromthe damage of the Great East
Japan Earthquake in 2011.

rotor diameter : 126m, hub height : 86m, the height of the top blade : 150m
depth : 48m,draft : 33m, length : 59m, width : 51m
no. of mooring chain : 6, chain diameter : 132mm

F kushima
FukhOffOffshorehW
inddC
onsortium
Fukushima
Offshore
WindConsortiumInstallation of 7MW wind turbine on Fukushima Shimpuu
The nacelle of 7MW wind turbine by Mitsubishi Heavy Industries, Ltd was fabricated at Yokohama Dockyard &Machinery Works, the tower was manufactured at Kobe Shipyard & Machinery Works, and the blades over 80m weremanufactured in Germany. All the above components were installed on the floater at Onahama port in Fukushima
prefecture. The world’s largest 7MW wind turbine installation was completed at the beginning of June, using one of thegigantic cranes which were only a few in the world. The height of the top blade is about 200m above the sea level.

Blade

Completion of installation of 7MW wind turbine on the floater

Installation of blade by special equipment

NacelleConstruction of 5MW wind turbine and the floater for Fukushima Hamakaze
5MW down-wind turbine manufactured by Hitachi Ltd is now under construction and will be installed on
Fukushima Hamakaze, which will be the second floating wind turbine facility in the second phase. Advanced
spar floater for Fukushima Hamakaze is also under construction at Sakai Works of an affiliated company ofJMU. The floater with 51m width and 33m draft is optimized for the construction and transport.

Upper hul under building

Floater under building

5MW down-wind turbine (the same type)

Mooring chain development
All mooring chain used for the four floaters, the material of which is made by Nippon Steel & Sumitomo Metal,are produced at Hamanaka factory. This material with lots of world track record is applicable to severe
metocean condition in Japan and improves abrasion and fatigue resistances. By 3-D analysis and fatigue
testing in the sea water, safety and reliability are validated. A dynamic analysis of the mooring lines by using
measured floater motion, the lifetime of the mooring line was evaluated and the development of long life chain
are also conducted.

3-D analysis

Starting

Mooring chain for Fukushima Shimpuu

2 months later

4 months later

Fatigue
海水中疲労試験
testing in the sea

Riser cable development
The world largest riser cable is used to connect the sub-marine cable and floating substation as well as floating windturbines. The riser cable needs to be designed against fatigue load and water shielding is required while optimizing it
against floater movement and wave effect. To keep the riser cable in planned shape, the intermediate buoy, developedby Furukawa Electric Co., Ltd and local UJK was used from the 2nd phase. Since the commissioning in November,
2013, there has been no major problem on power transmission. The data measured by the censors attached on theriser cable is useful for the estimation of the life time of the cables and the development of O&M method.

Installation of riser cable for Fukushima Shimpuu

Riser cable and intermediate buoy in the sea

Environmental impact assessment
After installation of 2MW wind turbine Fukushima Mirai and world-first floating substation Fukushima Kizuna,
environmental impact around the site has been investigated. By visual inspection which is conducted four times
a year from ship, albatross and pelagic cormorant are found as valued sea bird species and by sea bed fish
inspection redwing searobin and pacific cod are found. By the fixed point observation through the year, pacificwhite-side dolphin is found as marine mammal and yellow tail and large scale blackfish is found to be morethan around adjacent sea.

CameraVisual inspection of sea bird

Albatross

Peregrine

AlcidaeFixed point observation of floating fish and marine mammal

Pelagic cormorant

Redwing searobin

Pacific cod

Yellow tailA-tag

Black fish

Marine navigation safety
To assess the risks of collision of ships and moored floating wind turbines, maritime traffic was investigatedusing AIS and navigation radar at Fukushima site. The collision, initiation of drifting and drifting behavior ofships and wind turbines were investigated in wave basins. Analysis code of Rotor-Floater-Mooring coupledanalysis code was improved to investigate the response of mooring line in shallow water. The risk evaluation
procedure of the chain drift was developed based on the risk scenario combined with a chain drifting simulation
method.

Marine navigation investigation without AISMarine navigation
investigation by AIS Investigation equipment

Rader equipmen

Collision testFukushima Floating Offshore Wind Farm Demonstration ProjectCollaboration with fishery industry
Not only the regular meeting with fisherman, but also the research on fishing environment, fish catch testing,fish research by ROV and provision of marine information data are proceeded. Through these activities, bydeveloping a new fishing method and clarifying the effect of fishing bank and fish gathering, future direction of
the collaboration between floating wind turbine and fishery industry was investigated.

Testing by the model of sea bed net

風車浮体
自動給餌装置音響馴致装置漁礁

漁礁

Image of fish reef

Fish gathering around mooring chain

Fish gathering around Substation

Operating and maintenance
2MW wind turbine and world first substation are working well since the commissioning at the end of 2013. At
the landing point of sub-marine cable, the onshore switching station is constructed and the four people arealways managing the offshore wind turbine facility by remote monitoring. While the normal maintenance workfor the power facility is done by boat, emergency response training by helicopter is also implemented to
execute necessary behavior in the case of emergency and more effective access method and O&M method
are developed.

Emergency response testing by helicopter

Monitering at the on shore Switching station

Monitoring camera

Marine navigation safety monitoring Marine navigation safety monitoring

Access by boat
Fukushima Offshore Wind Consortium

Fukushima Offshore Wind Consortium
Marubeni Corporation
1-4-2 Otemachi, Chiyoda-ku, Tokyo 100-8088

The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656

Mitsubishi Corporation
2-3-1 Marunouchi, Chiyoda-ku, Tokyo 100-8086

Mitsubishi Heavy Industries, Ltd.
2-16-5 Konan, Minato-ku, Tokyo 108-8215

Japan Marine United Corporation
5-36-7 Shiba, Minato-ku, Tokyo 108-0014

Mitsui Engineering & Shipbuilding Co., Ltd.
5-6-4 Tsukiji Chuo-ku, Tokyo 104-8439

Nippon Steel & Sumitomo Metal Corporation
2-6-1 Marunouchi, Chiyoda-ku, Tokyo 100-8071

Hitachi, Ltd.
1-6-6 Marunouchi, Chiyoda-ku, Tokyo 100-8280

Furukawa Electric Co., Ltd.
2-2-3 Marunouchi, Chiyoda-ku, Tokyo 100-8322

Shimizu Corporation
2-16-1 Kyobashi, Chuo-ku, Tokyo 104-8370

Mizuho Information & Research institute, Inc.
2-3 Kandanishikicho, Chiyoda-ku, Tokyo 101-8443

Contacts:
The University of Tokyo
Department of Civil Engineering
School of Engineering
Prof. Dr. Takeshi Ishihara
Manager Shigeru Taki
2-11-16 Yayoi Bunkyo-ku Tokyo 113-8656 Japan
Tel +81-3-5841-6145 fax +81-3-5841-0609