This environmental impact assessment for Kriegers flak ... - Vattenfall

During the construction phase, the entire site including
a 500 metre security zone will be suspended. A
suspension notice will be sent to Ufs (Notices for
seafarers) and the area will be laid out in navigational
charts. Radio messages about the suspension will be
relayed at several times.
5.6.3. The operational phase
The wind turbines will function automatically and
will produce electricity at wind speeds between 3,5
and 30 m/s. At wind speeds above 30 m/s the pitch of
the blades will adjust to a 0 degree angle causing the
turbines to stop rotating until the wind speed again is
lower that 30 m/s.
The wind turbines will be operated from an onshore-based
operation centre. The inbuilt control
systems will detect problems early and will send error
messages to the op-centre. It will be possible to switch
on or off turbines from the op-centre. Communication
will be established through an opto cable that will be
integrated with the main electrical cable. A satellite
backup system will also be available should the opto
cable fail.
All operational data will be registered in the op-centre.
Personnel will man the op-centre around the clock.
The following systems will be monitored:
• The wind turbines
• The infrastructure (cables and foundations)
• Nautical security systems
• Air security systems (bulbs on the wind turbines etc)
The transformer stations that register storms, Þ re
etc., will, in addition, be monitored.
The monitoring system in the op-centre must be
able to determine where a potential fault has occurred
as well as the scale thereof.
Through this constant monitoring, faults and problems
should be cured or limited before serious damage
has occurred.
The wind turbine suppliers will, once or twice per
DESCRIPTION OF THE WIND FARM 33
year, carry out inspections and service on the turbines.
During these visits, among other service tasks, a
change of oil Þ lters takes place. The oil in the gearbox
is changed every 2 – 3 years.
To assist during emergencies, the turbines will each
have a bedroom equipped with Þ rst aid kits, food, life
buoys, lifelines, duvets, Þ re extinguishers and Þ re
alarms. There will also be communication devices with
direct links to rescue stations onshore. The room can
also be used by service men that need to stay on the
turbines to carry out extended repairs or maintenance
work.
It will be possible to board each wind turbine by
ship and there will be equipment installed to allow
personnel to climb up onto the turbine by themselves
from the water level.
Security and survival training relating to the special
risks associated with work offshore will be given to all
service personnel.
The wind turbines will be operated in accordance
with current health, environment, rescue, electrical
safety and work environment regulations.
5.6.4. The dismantling phase
The operational phase is expected to last for 30 years.
Following the operational phase, the wind turbines as
well as most of the infrastructure installations, will
be dismantled. To avoid uncontrollable leakage, any
environmentally hazardous ß uids (such as oils) will
be removed before the turbines are dismantled. The
section of the foundation that is situated further than
one metre into the seabed will be left after dismantling.
A plan for recycling will be drawn up and all parts that
can (e.g. steel and copper parts), will be recycled. The
work will be quality guaranteed.
When the construction phase starts, to ensure that
the dismantling actually will take place, the operator
will put up a surety for the dismantling costs in the
form of a bank guarantee.