(a) A ruling may be modified or rescinded by—

(1) Publication of the modification or rescission by DOE in the Federal Register and in 10 CFR part 518; or

(2) Adoption of a rule that supersedes or modifies a prior ruling.

(b) A person shall not be subject to the sanctions or penalties stated in these regulations for actions taken in reliance upon a ruling, notwithstanding that the ruling is subsequently declared to be invalid or no longer applicable. A person affected by a ruling may not rely upon it for more than 30 days after it has been rendered invalid pursuant to issuance of a superseding rule by OFE, or after it has been rescinded or modified by DOE.