Home › CFR › Title 10 › Part 84010 CFR Part 840 — Extraordinary Nuclear Occurrences§ 840.1— Scope and purpose.§ 840.2— Procedures.§ 840.3— Determination of extraordinary nuclear occurrence.§ 840.4— Criterion I—Substantial discharge of radioactive material or substantial radiation levels offsite.§ 840.5— Criterion II—Substantial damages to persons offsite or property offsite.