[en] Documentation is provided in this report for the closeout of IE Bulletin 80-23 regarding failures in safety-related systems of nuclear power plants due to solenoid valves manufactured by the Valcor Engineering Corporation. Closeout is based on the implementation and verification of three actions by licensees of operating plants, or one action by holders of construction permits. Evaluation of utility responses and NRC/Region inspection reports indicates that the bulletin is closed out for all of the 120 facilities to which it was issued for action. Background information is supplied in the Introduction and Appendix A of this report