[beefman]

RBMK is not considered a PWR because it is graphite-moderated. Most reactors are classified first by their moderator. PWRs and BWRs are both LWRs, moderated by light water, as opposed to HWRs moderated by heavy water, or graphite-moderated reactors like RBMK, or fast reactors which have no moderator at all.

Any reactor can fail and any can be operated safely. The reactivity coefficients of RBMK made it harder to control, perhaps, than a PWR. Modifications made after the Chernobyl accident have improved this.

The main issue with Chernobyl 4 was its lack of a containment building. Even so, the response was an over-reaction that made the situation worse.

[hef19898]

RMBKs are an unsafe design. Chernobyl No. 4 was build in an unsafe manner and operated in an unsafe manner.

Not sure which response to the accident was an over-reaction in your opinion so.