05000335/FIN-2013003-03
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | During plant operation in Modes 1 through 4, Unit 1 TS 3.7.7 limiting condition of operation (LCO) for the control room emergency ventilation system (CREVS) requires two air conditioning units. Unit 2 TS 3.7.7.1, LCO for the control room emergency air cleanup system (CREACS) requires two independent CREACS be operable with at least one air conditioning unit per system. Both units technical specifications allow continued operation with only one air conditioning unit operable as long as the second air conditioning unit is restored to operability within seven days. Otherwise, the unit must be placed in hot standby within the next six hours. For Modes 5 and 6 or during movement of irradiated fuel assemblies, Unit 1 TS requires that with only one air conditioning unit operable, restore at least two air conditioning units to operable status within seven days or suspend movement of irradiated fuel assemblies. Unit 2 TS requires immediate operation of the remaining operable CREACS in the recirculation mode or immediately suspend movement of irradiated fuel assemblies. Contrary to the above, since initial plant startup, design errors associated with the control circuitry for both units control room air conditioning systems resulted in plant operation with less than two operable control room air conditioning systems for greater than the time allowed by TS. If initially in service, both units swing air conditioning unit (3C) would not have automatically restarted after a postulated loss of offsite power (LOOP). Due to heat loading, the Unit 2 CREACS typically operated with only one air conditioning unit in service with another in standby. The licensee determined that the standby air conditioning unit would not have started after a LOOP no matter which train was in standby. A review of Unit 1 control room logs showed that the 3C swing CREVS was last in operation with this design error on August 22, 2012 for a period of approximately 14 days which exceeded the TS LCO. Since initial Unit 2 startup, the TS LCO was not met with just one air conditioning unit in service. The performance deficiency described above was more than minor because it was associated with the barrier performance attribute of the barrier integrity cornerstone objective and challenged the ability of the control room air conditioning systems to automatically perform their radiological barrier design function after a LOOP coincident with a design basis accident. The inspectors used IMC 0609, Attachment 4 and Appendix A and G, and determined the finding was of very low safety significance or Green, because (1) the finding only represented a degradation of the barrier function provided for the control room (Appendix A, Exhibit 3) and (2) the finding did not impact any equipment necessary to maintain the unit in a safe shutdown condition (Appendix G). This finding has been entered into the licensees CAP as AR 1796780. Additional information regarding this finding is documented in Section 4OA3.2 of this report. |
| Site: | Saint Lucie  |
|---|---|
| Report | IR 05000335/2013003 Section 4OA7 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | T Morrissey D Rich S Sandal J Reyes |
| Violation of: | Technical Specification |
| INPO aspect | |
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Finding - Saint Lucie - IR 05000335/2013003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Saint Lucie) @ 2013Q2
Self-Identified List (Saint Lucie)
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