5 U.S.C. § 8122: Time for making claim

the immediate superior had actual knowledge of the injury or death within 30 days. The knowledge must be such to put the immediate superior reasonably on notice of an on-the-job injury or death; or written notice of injury or death as specified in section 8119 of this title was given within 30 days. In a case of latent disability, the time for filing claim does not begin to run until the employee has a compensable disability and is aware, or by the exercise of reasonable diligence should have been aware, of the causal relationship of the compensable disability to his employment. In such a case, the time for giving notice of injury begins to run when the employee is aware, or by the exercise of reasonable diligence should have been aware, that his condition is causally related to his employment, whether or not there is a compensable disability. The timely filing of a disability claim because of injury will satisfy the time requirements for a death claim based on the same injury. begin to run against a minor until he reaches 21 years of age or has had a legal representative appointed; or run against an incompetent individual while he is incompetent and has no duly appointed legal representative; or run against any individual whose failure to comply is excused by the Secretary on the ground that such notice could not be given because of exceptional circumstances.