Section 820.21 - Investigations(a) The Director may initiate and conduct investigations and inspections relating to the scope, nature and extent of compliance by a person with the Act and the DOE Nuclear Safety Requirements and take such action as he deems necessary and appropriate to the conduct of the investigation or inspection, including any action pursuant to § 820.8 .(b) Any person may request the Director to initiate an investigation or inspection pursuant to paragraph (a) of this section. A request for an investigation or inspection shall set forth the subject matter or activity to be investigated or inspected as fully as possible and include supporting documentation and information. No particular forms or procedures are required.(c) Any person who is requested to furnish documentary evidence, information or testimony in an investigation or during an inspection shall be informed, upon written request, of the general purpose of the investigation or inspection.(d) Information or documents that are obtained during any investigation or inspection shall not be disclosed unless the Director directs or authorizes the public disclosure of the investigation. Upon such authorization, the information or documents are a matter of public record and disclosure is not precluded by the Freedom of Information Act, 5 U.S.C. 552 and 10 CFR part 1004 . A request for confidential treatment of information for purposes of the Freedom of Information Act shall not prevent disclosure by the Director if disclosure is determined to be in the public interest and otherwise permitted or required by law.(e) During the course of an investigation or inspection any person may submit at any time any document, statement of facts or memorandum of law for the purpose of explaining the person's position or furnish information which the person considers relevant to a matter or activity under investigation or inspection.(f) If facts disclosed by an investigation or inspection indicate that further action is unnecessary or unwarranted, the investigation may be closed without prejudice to further investigation or inspection by the Director at any time that circumstances so warrant.(g) The Director may issue enforcement letters that communicate DOE's expectations with respect to any aspect of the requirements of DOE's Nuclear Safety Requirements, including identification and reporting of issues, corrective actions, and implementation of DOE's Nuclear Safety Requirements, provided that an enforcement letter may not create the basis for any legally enforceable requirement pursuant to this part.(h) The Director may sign, issue and serve subpoenas.58 FR 43692, Aug. 17, 1993, as amended at 72 FR 31921 , June 8, 2007