ECCS Accumulators

1
2
  •    NPCIL
  •    Rajasthan 7 &8
  •    6 + 6
  •    Nuclear Division

Description

Two types of accumulator tanks for the reactor emergency core cooling system were manufactured.

Light water accumulator tanks inject light water into the primary heat transport circuit during a loss of coolant accident to prevent core meltdown. Air/Nitrogen accumulator tanks inject nitrogen into the PHT circuit to raise the pressure.

The number of tanks for each reactor were:

  1. Light water accumulator tanks: 4
  2. Air accumulator tanks: 2

Construction details

Material: SA 516 Gr 70

Dimensions:

  • Light Water Accumulators: Dia. 3.54m ; Length 9.09m ; Shell 80mm Thk ; Dish End 88mm Thk
  • Air Accumulators: Dia. 2.93m ; Length 7.14m ; Shell 65mm Thk ; Dish End 72mm Thk

Critical aspects

  • Welding: 100 % RT
  • Hydro: 69 kg/ cm2
  • Air Leak Test: 7 kg/ cm2