Develop a model to explain how a failure in a continuous reactor changes in nature when it moves from a local operational deviation to a plant-wide propagated disturbance.

The answer must differentiate:

1. reactor kinetics and local operation;
2. coupling between reaction, separation, and utilities;
3. plant safety, specification, and productivity.

Organize the answer in three parts:

I. condition of occurrence;
II. condition of propagation;
III. condition of correction.
