TS 5.4.1 requires procedures as specified in
Regulatory Guide (RG) 1.33, Appendix A. Radiation Protection Management Procedure (RPMP) 10.3, Dose Rate Monitoring System (
DRMS) Alarm Surveillance and Response, requires the
DRMS Alarm Summary screen to be displayed at all times in the S&C work area and that the Alarm Screen be inspected for alarms at least twice per shift. Contrary to the above, on November 4, 2007, the
DRMS display had timed out to the screen saver, resulting in dose rate increases on the ND (
residual heat removal) piping to go unnoticed. ND pump 2A was started by operations at 1:26 a.m.; the increasing dose rates were not identified until an individual received a dose rate alarm in the B/C fan room in lower containment (posted/controlled as a
high radiation area) at approximately 0930. The investigation of the dose rate alarm by
HP led to the identification of higher than expected dose rates on the ND piping. HPTs were then dispatched to survey areas in the auxiliary building containing ND piping; eight rooms were identified to have
high radiation area conditions that were not being posted and controlled as
high radiation areas. The rooms were posted and controlled as appropriate by approximately 1630. This event is documented in the licensees
CAP as
PIPs C-07-6728 and C-07-6732. The violation was evaluated using the
Occupational Radiation Safety Significance Determination Process and was determined to be of very low safety significance (Green) because this finding did not involve
ALARA planning or work controls, was not an over-exposure, did not have a substantial potential for over-exposure, and the ability to access dose was not compromised