Closeout of IE Bulletin 80-03: Loss of Charcoal from Standard Type II, Two-Inch, Tray Adsorber Cells.

摘要

Because of concern about defective charcoal tray adsorber cells found in certain ventilation systems at the Sequoyah Nuclear Plant, the NRC/IE issued IE Bulletin 80-03 on February 6, 1980. Some charcoal cells are used in ventilation systems associated with engineered safety features, which are provided for protection from abnormal events. Others are installed to control radioactive materials during expected operations. Licensees of operating power reactors and holders of permits for those under construction were required to take specific actions. Evaluation of utility responses and NRC/Region inspection reports shows that the bulletin can be closed out by means of specific criteria for 123 (99%) of the 124 facilities with operating licenses or construction permits. A followup item is proposed for the only facility with open bulletin status, for use by the NRC in ensuring satisfactory completion of corrective action. The cells with riveted screens which were identified at Sequoyah were not found at any other facility. Although cells with miscellaneous defects were found at nine facilities other than Sequoyah, there were no charcoal problems.