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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 47171 | 21 June 2011 17:08:00 | 10 CFR 50.73(a)(1), Submit an LER | 60-Day Optional Telephonic Notification of Invalid Specified System Actuation | Invalid Actuation of Turbine Driven Auxiliary Feedwater (TDAFW) pump. This telephone notification is being made under reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1). On 6/21/11 at 1308 EDT, during maintenance activities for replacement of relay UVTXSB/1732, associated with 6.9kv Emergency Bus 1B-SB undervoltage trip circuitry, an automatic start of the Turbine Driven Auxiliary Feedwater (TDAFW) pump occurred while using a new procedure, CM-E0032. At the time of the event, all steam generator levels were normal. The TDAFW pump was secured by Operations on 6/21/11 at 1311 EDT. No actual condition existed that would require an automatic start of the TDAFW pump and therefore this event has been classified as an invalid actuation. The start of the TDAFW is considered a complete train actuation. The system started and functioned successfully. The licensee has notified the NRC Resident Inspector. | Steam Generator Auxiliary Feedwater | |
| ENS 46435 | 10 November 2010 05:24:00 | 10 CFR 50.73(a)(1), Submit an LER | Telephone Notification in Lieu of Written Ler - Invalid Actuation of Motor Driven Auxiliary Feedwater Pump | Event: Invalid actuation of the 'B' Motor Driven Auxiliary Feedwater (MDAFW) pump. Report Type: This 60-day telephone notification is being made under 10CFR50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1). Description: On November 10, 2010, the 'A' Main Feedwater Pump (MFP) was started per plant operating procedures. When the 'A' MFP was started, there was a partial activation of the Auxiliary Feedwater System with the start of the 'B' MDAFW. The plant was in Mode 3 after completing refueling outage 16 during this event. Actual plant conditions and parameters did not exist that required an automatic start of the 'B' MDAFW pump. Therefore, this actuation is classified as invalid. The system started and functioned successfully. This invalid actuation was entered into the corrective action program as NCR-432566. The licensee notified the NRC Resident Inspector. | Feedwater Auxiliary Feedwater | |
| ENS 46467 | 28 October 2010 20:04:00 | 10 CFR 50.73(a)(1), Submit an LER | Invalid Actuation of the "B" Emergency Service Water (Esw) Pump | Text provided by the licensee. Quotations omitted for readability. Report Type: This 60-day telephone notification is being made under 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1). Description: On October 28, 2010, during the performance of MST I0073, "Train 'B' 18 Month Manual Reactor Trip, Solid State Protection System Actuation Logic & Master Relay Test", two sequential errors resulted in the inappropriate activation of the 'B' ESW pump. During night shift on October 27/28th, the Master Relay Selector Switch was not returned to the required OFF position. This caused day shift to find one of the two general warning lights to be lit. During the troubleshooting for the light, a technician discovered the Master Relay Selector Switch out of the expected OFF position as required by the procedure. A technician moved the switch to the OFF position outside of procedural guidance, resulting in the partial activation of the Reactor Protection System, including the 'B' ESW pump. The plant was in Mode 6 due to refueling outage 16 during the event. Actual plant conditions and parameters did not exist that required an automatic start of the 'B' ESW Pump. Therefore, this actuation is classified as invalid. The system started and functioned successfully. This invalid actuation was entered into the corrective action program as NCR 430289. Cause: Poor performance of task by the individual. The licensee informed the NRC Resident Inspector. | Service water Reactor Protection System | |
| ENS 45838 | 16 February 2010 15:22:00 | 10 CFR 50.73(a)(1), Submit an LER | Invalid Actuation of a Motor Driven Auxiliary Feedwater Pump | This 60-day telephone notification is being made under reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1). On 2/16/10 at 1122 EST, following maintenance activities on 'B' Emergency Safeguards Sequencer, Clearance Order 213623, was in the process of being lifted when an automatic start of 'B' Motor Driven Auxiliary Feedwater (MDAFW) pump occurred. Water flowed to all three Steam Generators resulting in an increase of reactor power by 0.1%. Isolation of Steam Generator Blowdown and Blowdown Sampling also occurred. The actuation occurred during work associated with replacement of relay 2-55/1163 which was installed incorrectly in the "B" Sequencer cabinet. At the time of the event, all Steam Generator levels were normal. No actual condition existed that would require an automatic start of the "B" MDAFW pump and therefore this event has been classified as an invalid actuation. All equipment operated properly. The 'B' MDAFW pump was secured by operations at 1123 EST. This invalid actuation was entered into the corrective action program as (Harris Nuclear Condition Report) NCR 381672. The safety significance of this event is considered to be minimal. The 'B' MDAFW pump started and operated normally and the 'A' MDAFW and Turbine Driven Auxiliary Feedwater (TDAFW) pumps were available. Immediate corrective actions were to secure the "B" MDAFW pump and restore Steam Generator Blowdown and Sampling. The licensee has notified the NRC Resident Inspector. | Steam Generator Auxiliary Feedwater |