Replying to an RTI query, the central bank also said it does not have "specific information" on what resulted in detection of the over Rs 14,000 crore scam at PNB and directed the application to the state-run bank for providing those details.
The scam, considered to be the biggest ever fraud in India's history, came to light earlier this year. PNB was allegedly defrauded by diamond merchant Nirav Modi and his uncle Mehul Choksi, the promoter of Gitanjali Gems.
Among other agencies and regulators, the RBI is also undertaking a detailed probe into the case for necessary action.
In response to queries under the Right to Information (RTI) Act, the central bank clarified that the RBI does not carry out audit of banks. However, the RBI conducts inspection/risk-based supervision of banks, it added.
Giving details for the past ten years, the RBI gave dates for the annual inspection carried out at the PNB head office between 2007 and 2017, except for 2011, for which the bank said the "dates (are) not available".
When asked about the copies of inspection reports and details of objections raised by it, the RBI said the information was exempted under various clauses of the RTI Act.
"The inspection reports of banks and other related documents contain information which is exempt from disclosure under Section 8 (1) (a), (d), (j) and (h) of RTI Act, 2005," it said in reply to the RTI application filed by this correspondent.
The clause (d) bars information the disclosure of which would harm the competitive position of a third party, whereas the section 8 (1) (h) exempts disclosure of information which would impede the process of investigation or apprehension or prosecution of offenders.
The clause (j) bars information which relates to personal information and the disclosure of which has no relationship to any public activity or interest, or which would cause unwarranted invasion of the privacy of the individual.
The RBI said that the severance of exempt parts in all inspection reports would divert the resources of the public authority in an unreasonable way.
"In view of the same it is not feasible to disclose the information sought by the applicant," the central bank said.
The RBI has transferred the application to the PNB on query seeking details of inspection reports that led to detection of the massive fraud in the bank.
"The specific information sought is not available with us. However, the RTI application is being transferred to PNB under Section 6 (3) of the RTI Act, 2005 for providing information, if any, directly to the applicant," it said.