Equipment failures are often caused by multiple
mechanical and chemical interactions.
Root-Cause-Failure-Analysis (RCFA) is complicated by the fact
that chemical failure mechanisms can disguise themselves as
mechanical failure mechanisms and vice versa. Initial
impressions may seem plausible, but corrective actions will
be ineffective if RCFA fails to distinguish between chemical
and mechanical causal factors. The following two case
histories illustrate this point. They demonstrate the
importance of resolving all ambiguity in the RCFA
process.
Case history 1: Steam generator tube
reliability. Steam generator tube
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