Except as provided in subsection (b) of this section, a licensee which violates any regulation or written directive issued by the Administrator, requiring the filing of any regular or special report pursuant to section 687b(b) of this title, shall forfeit and pay to the United States a civil penalty of not more than $100 for each and every day of the continuance of the licensee’s failure to file such report, unless it is shown that such failure is due to reasonable cause and not due to willful neglect. The civil penalties provided for in this section shall accrue to the United States and may be recovered in a civil action brought by the Administration.