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| Site | Quarter | Title | Description | |
|---|---|---|---|---|
| 05000373/FIN-2016007-01 | LaSalle | 2016Q2 | Failure to Monitor the Fouling Conditions of the CSCS Equipment Area Coolers | The team identified a finding of very-low safety significance (Green) and an associated NCV of Title 10, Code of Federal Regulations (CFR), Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for the failure to monitor the fouling conditions of the core standby cooling system (CSCS) equipment area coolers. Specifically, the licensee did not develop performance test procedures to assess the fouling conditions of the safety-related CSCS equipment area coolers and did not have acceptance criteria that delineate when to remove accumulations. The licensee captured this issue in their Corrective Action Program (CAP) as Action Request (AR) 02665463 and established a standing order for operations to impose more restrictive service water temperature limits to reasonably assure the operability of the affected coolers until long term corrective actions were implemented to restore compliance. The performance deficiency was determined to be more than minor because it was associated with the Mitigating System cornerstone attribute of equipment performance and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding screened as of very low safety significance (Green) because it did not result in the loss of operability or functionality of mitigating systems. Specifically, the licensee reviewed actual service water temperature values measured during the last 12 months, performed an operability evaluation, and concluded that the historical temperatures did not exceed the operability limits established by the operability evaluation. The team did not identify a cross-cutting aspect associated with this finding because it was not confirmed to reflect current performance. Specifically, the test program for the CSCS equipment area coolers was developed in the decade of 1990s. |
| 05000373/FIN-2009005-01 | LaSalle | 2009Q4 | Changes to EAL HU6 Potentially Decrease the Effectiveness of the Plans without Prior NRC Approval | The inspectors reviewed changes implemented to the LaSalle Station Radiological Emergency Plan Annex EALs and EAL Basis. In Revision 26, the licensee changed the basis of EAL HU6, Fire not extinguished within 15 minutes of detection within the protected area boundary by adding two statements. The two changes added to the EAL basis stated that if the alarm could not be verified by redundant control room or nearby fire panel indications, notification from the field that a fire exists starts the15-minute classification and fire extinguishment clocks. The second change stated the15-minute period to extinguish the fire does not start until either the fire alarm is verified to be valid by additional control room or nearby fire panel instrumentation, or upon notification of a fire from the field. These statements conflict with the previous LaSalle Station Annex, Revision 25, basis statements and potentially decrease the effectiveness of the plans. LaSalle Station Radiological Emergency Plan Annex, Revision 25,EAL HU6, initiating condition stated, Fire not extinguished within 15 minutes of detection, or explosion, within the protected area boundary. The threshold values forHU6 were, in part: 1) Fire in any Table H2 area not extinguished within 15 minutes of control room notification or verification of a control room alarm, or 2) Fire outside any Table H2 area with the potential to damage safety systems in any Table H2 area not extinguished within 15 minutes of control room notification or verification of a control room alarm. Table H2, Vital Areas, were identified as reactor building, control room, auxiliary building, DG rooms, switchgear and battery rooms, remote shutdown rooms, core standby cooling system pump rooms, and lake screenhouse. The basis defined fire as combustion characterized by heat and light. Sources of smoke such as slipping drive belts or overheated electrical equipment do not constitute fires. Observation of flame is preferred but is not required if large quantities of smoke and heat are observed. The basis for Revision 25, EAL HU6 thresholds one and two stated, in part, the purpose of this threshold is to address the magnitude and extent of fires that may be potentially significant precursors to damage to safety systems. As used here, notification is visual observation and report by plant personnel or sensor alarm indication. The 15-minuteperiod begins with a credible notification that a fire is occurring or indication of a valid fire detection system alarm. A verified alarm is assumed to be an indication of a fire unless personnel dispatched to the scene disprove the alarm within the 15-minute period. The report, however, shall not be required to verify the alarm. The intent of the 15-minuteperiod is to size the fire and discriminate against small fires that are readily extinguished(e.g., smoldering waste paper basket, etc.).Revision 26 of the LaSalle Station Radiological Emergency Plan Annex changed the threshold basis for EAL HU6 by adding the following two statements: 1) If the alarm cannot be verified by redundant control room or nearby fire panel indications, notification from the field that a fire exists starts the 15-minute classification and fire extinguishment clocks, and 2) The 15-minute period to extinguish the fire does not start until either the fire alarm is verified to be valid by utilization of additional control room or nearby fire panel instrumentation, or upon notification of a fire from the field. The two statements added to the basis in Revision 26 conflict with the Revision 25threshold basis and initiating condition. The changed threshold basis in Revision 26could add an indeterminate amount of time to declaring an actual emergency until a person responded to the area of the fire and made a notification to the control room of a fire in the event that redundant control room or nearby fire panel indications were not available. Pending further review and verification by the NRC to determine if the changes to EALHU6 threshold basis potentially decreased the effectiveness of the plans, this issue was considered an unresolved item (URI 05000373/2009005-01/ 05000374/2009005-01). |