KKS identifier: KKS stands for the German Kraftwerk-Kennzeichensystem, which is the power plant identification system. This code is a structured, four-character identifier that designates components within a power plant (or any equipment), starting from the largest system down to the smallest. An example:

• Block 0: 1 – In this case, the first unit of the power plant
• Block 1: 2LAC03:
  • Main group 2L: 2. Steam, water, gas cycle group
    • Subgroup 2LA: Feedwater system
      • Subgroup 2LAC: 2. feedwater pump system
        • 2LAC03: third feedwater pump system
• Block 2: CT002
  • Main group C: Direct measurement
    • Subgroup CT: temperature measurement
      • CT002: second temperature measurement
• Block 3: QT12
  • Main group K: I&C equipment
    • Subgroup QT: Sensor protection of protective pipes
      • QT12: Sensor protection of 12. protective pipe

That is, the above KKS code hides the 12th protective pipe protection of the 3rd pump of the second feedwater system of the first power plant unit.