Appendices

125

Repair
This  encompasses  all  measures  to  be  taken  in  order  to  restore  functionality  after  an  incident.
Restricted  Area
Restricted  areas  are  areas  that  contain  technical  facilities  that  are  important  to  both  safety
and  operations  that  primarily  require  protection  from  unauthorised  access  and  basic  hazards
in  order  to  ensure  these  facilities  function  as  expected  at  all  times.  Secondarily,  preventing
access  to  restricted  areas  may  also  protect  untrained  personal  from  specific  hazards,  such  as
areas  where  electrical  equipment  is  operated  and  battery  installations.
Rotor/Nacelle  Assembly  (RNA)
Part  of  an  offshore  wind  turbine  that  is  maintained  by  a  support  structure,  see  Figure  1  -1.  The
rotor/nacelle  assembly  consists  of  a  nacelle  and  rotor  blades.  The  RNA  includes  the  screw
connection  to  the  tower  flange  that  is  the  interface  to  the  tower  which  is  part  of  the  support
structure.  The  fixtures/components  in  the  support  structure  that  are  necessary  for  the  operation ­
  of  the  RNA  are  part  of  the  RNA  (for  example  converter,  transformer,  switchgear  cabinets). ­

Safety  System
The  safety  system  is  intended  to  ensure  that  the  facility  remains  in  a  safe  condition  in  the
event  of  a  disturbance.
Scatter  Diagram
A  scatter  diagram  is  the  graphical  representation  of  an  observed  pair  of  values  of  two  statistical ­
  attributes.  These  pairs  of  values  are  plotted  into  a  Cartesian  coordinate  system  which  results ­
  in  a  bivariate  point  distribution  (scatter).
Scour
Deepening  of  the  seabed  in  the  area  of  the  foundation  structure  due  to  current-induced  mineral ­
  erosion.
Secondary  Structure
Built-on  accessories,  machine-mounted  accessories  and  fixtures  that  are  attached  to  the  primary ­
  structure  and  located  outside  the  main  power  flow.
Serviceability  Limit  State  (SLS)
State  beyond  which  the  defined  conditions  regarding  the  serviceability  of  a  support  structure
or  a  component  are  no  longer  fulfilled.
With  regard  to  the  foundation,  this  limit  state  is  reached  when  an  increase  of  the  effects  (service ­
  loads)  would  lead  to  intolerably  large  total  displacements  or  permanent  displacements  of
the  subsoil,  the  foundation  elements  or  their  components.
Shear  Keys
Shear  keys  are  welded  reinforcements  around  the  outer  surface  of  a  pile  and  at  the  connection ­
  piece  in  the  grouted  area.  The  shear  keys  are  intended  to  increase  the  sustainability  of  the
joint  between  the  mortar  and  the  steel.
Soil  (Loose  Rock)
Superordinate  material  designation  for  the  different  layers  of  subsoil.