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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 49002 | 5 May 2013 05:12:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Technical Specification Shutdown - Safety Injection Refueling Water Tank Declared Inoperable Due to Leak | At 0112 EDT on May 5, 2013, the plant commenced a shutdown due to water leakage from the SIRW (Safety Injection Refueling Water) Tank exceeding the operational decision-making issue process trigger point of 34 gallons per day, causing it (the SIRW) to be declared inoperable and requiring entry into Technical Specification LCO 3.5.4 Condition B. LCO 3.5.4 Condition B requires the SIRW Tank to be returned to Operable status within one hour or entry into Condition C which requires the plant to be in Mode 3 within 6 hours and Mode 5 within 36 hours. This event had no impact on the health and / or safety of the public. The NRC Resident has been notified. The exact location of the leakage has not been determined at this time. The Plant will be taken to Mode 5. The licensee has been operating with SIRW leakage at a rate of less than 34 gallons per day. The leakage has increased for unknown reasons to a calculated value of approximately 90 gallons per day. See EN #48018 dated 06/12/12 for similar report on a technical specification shutdown for the SIRW tank leakage. | ||
| ENS 48758 | 15 February 2013 18:00:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Technical Specification Required Shutdown Due to Component Cooling Water Train Out of Service | At 2030 hours (EST) on February 14, 2013, technical specification (TS) 3.7.7 condition A was entered due to the right train of the component cooling water (CCW) system being declared inoperable. The cause of the inoperable train was the identification of an approximate 40 gallon per hour CCW system to service water system leak inside the 'A' CCW heat exchanger. TS 3.7.7 condition A requires restoration of the inoperable train within 72 hours. If the restoration is not completed within 72 hours, the plant must be in Mode 3 within 6 hours and in Mode 5 within the subsequent 36 hours. Due to the inability to repair the leak within the required 72 hour time frame during power operation, a plant shutdown was initiated at approximately 1300 hours on February 15, 2013. Entry into Mode 3 is expected at approximately 1700 hours on February 15, 2013. The plant will enter Mode 5 to execute leak repair. Mode 5 entry is expected at approximately 0800 hours on February 16, 2013. This event has no impact on the health and safety of the public. The NRC Resident Inspector has been notified. | Service water | |
| ENS 48478 | 4 November 2012 16:30:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Technical Specification Required Shutdown Due to Secondary Side Steam Leak | At 1115 EST on November 4, 2012, primary coolant loop #2 was declared inoperable due to a small un-isolable steam leak on a drain valve of an atmospheric steam dump valve on the secondary side of the 'B' Steam Generator. The valve is ASME Class II high energy piping and the non-conforming condition could not be evaluated with the steam generator pressurized. Based on the condition of the valve and the inability to evaluate, Technical Specification 3.4.4, PCS loops - Modes 1 and 2, Required Action A.1 was entered which requires the plant to be placed in Mode 3 in 6 hours. Repair of the valve may require cooldown to Mode 5. At 1230 EST on November, 2012, Palisades initiated a shutdown in accordance with Technical Specification 3.4.4. The licensee has notified the NRC Resident Inspector. | Steam Generator | |
| ENS 48018 | 12 June 2012 18:56:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Technical Specification Required Shutdown | At 1456 hours on June 12, 2012, the plant commenced a shutdown due to water leakage from the SIRW (Safety Injection Refueling Water) tank exceeding the operational decision-making issue process trigger point of 31 gallons per day causing it to be declared inoperable and requiring entry into Technical Specification (TS) 3.5.4, Condition B. TS 3.5.4 Condition B requires the SIRW Tank to be returned to operable status within one hour or entry into Condition C that requires the plant to be in Mode 3 within 6 hours and Mode 5 within 36 hours. Actual leakage from the SIRW Tank was measured at approximately 31.4 gallons per day. This event had no impact on the health and/or safety of the public. The NRC Senior Resident Inspector has been notified. The licensee believes that the tank is leaking from several locations. However, at this time, they cannot determine exact locations. The refueling water has minor tritium contamination. The refueling water is being collected in a reservoir and then pumped into a holding tank. The licensee will be shutting down to cold shutdown.
Subsequent review concluded the condition did not meet reporting criteria. The rate of water leakage from the Safety Injection Refueling Water Tank had reached an administrative limit. Shutdown was not required by the Technical Specifications. The plant shutdown commenced in accordance with normal plant operating procedures. At 1849 hours on June 12, 2012, the reactor was manually tripped. This event is not reportable as the reactor trip was part of a normal shutdown for corrective maintenance. Mode 5 was reached at 1745 hours on June 13, 2012. The NRC Resident Inspector has been notified. Notified R3DO (Lipa). | ||
| ENS 44385 | 6 August 2008 00:29:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Tech Spec Required Shutdown Due to Excessive Unidentified Leakage | On August 5, 2008, a planned shutdown was in progress to repair a control rod drive mechanism due to excessive leakage (within Tech Spec identified leakage limits). During the shutdown, the site experienced excessive unidentified leakage of approximately four gallons per minute for short periods following charging pump starts, due to leakage past the letdown relief valve. (this first occurred at 1629) As a result of the plant shutdown, and not being in a steady state condition, PCS leakage is unable to be definitively determined. Limiting Condition of Operation 3.4.13 was entered at 1629 hrs. The plant was in Mode 3 at 1955 hrs. The Tech Spec requirement is to restore leakage to within limits within 4 hours. If not within limits within 4 hours, be in Mode 3 within 6 hours (August 6, 2008 at 0229 hours) and be in Mode 5 within 36 hours (August 7, 2008 at 0829 hrs). This event is being reported as a 4-hour non-emergency report in accordance with 10 CFR 50.72(b)(2)(i), Tech Spec required shutdown. The licensee will notify the NRC Resident Inspector. | Control Rod | |
| ENS 42954 | 1 November 2006 23:05:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Unit Shutdown Required Due to Service Water Leak Involving a Containment Air Cooler | On November 1, 2006, at 1530 hours EST, a service water leak was identified in the cooling coil of Containment Air Cooler VHX-4. While this containment air cooler has no safety function for containment cooling, the breached cooling coil represents an inoperable containment boundary. In accordance with Technical Specification (T.S.) 3.6.1.B1&2, a shutdown was initiated at 1805 hours EST, following expiration of the completion time of 1 hour for restoring containment to operable per T.S. 3.6.1.A.1. The licensee anticipates having the unit in mode 3 Hot Standby by 2205 hours EST, at which time an evaluation involving extent of condition for the required repairs will be performed. The leak is characterized at this time as 300 ml/minute. The licensee informed the NRC Resident Inspector. | Service water | |
| ENS 42462 | 29 March 2006 17:15:00 | 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | Technical Specification Required Shutdown Due to Hpsi Inoperability | On 3/29/06 at 1215, the left train High Pressure Safety Injection (HPSI) Pump P-66B subcooling valve CV-3070 was declared inoperable due to valve failing to stroke. Technical Specification Limiting Condition for Operation 3.5.2 ECCS - Operating, Required Action B.1 requires HPSI train to be restored to operable status within 72 hours. This required action expires on 04/01/06 at 1215. It has been determined that it will not be possible to restore operability prior to the expiration of this action statement. A Technical Specification required shutdown to Primary Coolant system temperature < 325 degrees F will be initiated on March 31, 2006 at 2100. The site will then commence a planned refueling outage that was scheduled to begin on April 01, 2006. The licensee notified the NRC Resident Inspector.
Event date changed from 03/28/06 to 03/29/06. NRC Resident Inspector notified by licensee. R3DO (Anne Marie Stone) notified. |