(a) The Commission may require every public utility to give immediate notice to the Commission of the happening of any accident in or about, or in connection with, the operation of its service and facilities, wherein any person has been killed or apparently injured, or where complaint of injuries has been made, and to furnish such full and detailed report of such accident within such time and in such manner as the Commission shall prescribe.
(b) The report required by subsection (a) of this section shall not be open for public inspection, except by order of the Commission, and shall not be admitted in evidence for any purpose in any suit or action for damages growing out of any matter or thing mentioned in such report.