First Series of Production BWRs (BWR/1–BWR/6)
The first generation of production boiling water reactors saw the incremental development of the unique and distinctive features of the BWR: the torus (used to quench steam in the event of a transient requiring the quenching of steam), as well as the drywell, the elimination of the heat exchanger, the steam dryer, the distinctive general layout of the reactor building, and the standardization of reactor control and safety systems. The first, General Electric, series of production BWRs evolved through 6 iterative design phases, each termed BWR/1 through BWR/6. (BWR/4s, BWR/5s, and BWR/6s are the most common types in service today.) The vast majority of BWRs in service throughout the world belong to one of these design phases.
- 1st generation BWR: BWR/1 with Mark I containment.
- 2nd generation BWRs: BWR/2, BWR/3 and some BWR/4 with Mark I containment. Other BWR/4, and BWR/5 with Mark-II containment.
- 3rd generation BWRs: BWR/6 with Mark-III containment.
Containment variants were constructed using either concrete or steel for the Primary Containment, Drywell and Wetwell in various combinations.
Apart from the GE designs there were others by ABB, MITSU, Toshiba and KWU. See List of boiling water reactors.
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