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| Entered date | Event description | |
|---|---|---|
| ENS 48997 | 3 May 2013 10:39:00 | On May 3, 2013 at 0542 (EDT) hours with the reactor in Cold Shutdown and Reactor Mode Switch in Refuel, the Safety Parameter Display System (SPDS) was removed from service as part of a preplanned activity in order to repair the associated 120VAC instrument power supply transfer switching scheme. The reactor cavity is flooded the fuel pool gates are removed and refueling activities are in progress. Station risk is green and all key safety functions are green as well. It is anticipated the repair will be completed in approximately ten hours. Following the planned de-energization, it was determined that an apparent equipment failure resulted in the loss of main control room annunciator system. The appropriate abnormal procedure was entered and compensatory actions including periodic monitoring of bus voltages and field annunciator panels implemented for systems in service at the time of the loss. The annunciator system was restored on May 3, 2013 at 0640 hours. This USNRC Senior Resident Inspector has been notified. This event has no impact on the health and safety of the public. The licensee will notify the Commonwealth of Massachusetts. |
| ENS 48909 | 10 April 2013 16:19:00 | At 1314 hours on Wednesday, April 10, 2013 during a boroscopic inspection of the sub-surface portions of the Neutralizing Sump Discharge Line, Pilgrim Station discovered indications of a separation in the line. The line is currently isolated and no discharges were in progress during the planned inspection. This line is used infrequently to discharge permitted liquids that have the potential to contain radiological contamination. This notification is conservatively being made in accordance with Pilgrim site procedures with direct voluntary communications with offsite agencies. There is no impact on the safe operation of the plant and personnel are investigating the cause. The (NRC) Resident Inspector staff has been informed of this notification. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi). The licensee will notify the Massachusetts Emergency Management Agency (MEMA) and other state agencies.
Entergy Pilgrim Station has twenty three (23) groundwater monitoring wells used to sample for tritium and other radioactive nuclides in accordance with the Nuclear Energy Institute's (NEI) voluntary Groundwater Protection Initiative (GPI). One of the newly installed wells, MW-219, located in the vicinity of a Catch Basin adjacent to the Reactor Building Auxiliary Bay and in the flow path of the Neutralizing Sump Discharge Line indicated an elevated level of tritium (H3), that exceed the limits established by the NEI Groundwater Protection initiative and the Nuclear Regulatory Commission's (NRC) limits for liquid effluent release. A protocol for more frequent sampling has been instituted and an investigation of the cause is underway. To date, tritium is the only isotope detected In the groundwater monitoring well samples collected at the site. This supplemental information has been voluntarily communicated to Federal, State and local stakeholders. The NRC Resident Inspector has been notified of this update. This is an update to the 4-hour non-emergency notification made in accordance with 50.72(b)(2)(xi) on April 10, 2013 at 1619 hours. Notified R1DO (Rogge). |
| ENS 45879 | 28 April 2010 19:40:00 | On 04/28/10, at 1400 EDT, with the reactor at 100% power, the Reactor Core Isolation Cooling (RCIC) system was declared inoperable by the Shift Manager (SM) due to an oil leak on the RCIC governor control oil system that could have impacted the system performance during the accredited 24 hour mission time. The fitting where the oil leakage was observed was tightened and the machine was placed in service with no leakage identified. Currently the system is operable and in its normal standby lineup. The system was available for use during this time. At no time was there an impact to the health and safety of the public. The licensee has notified the NRC Resident Inspector.
On April 28, 2010, at 1940 hours, Pilgrim Nuclear Power Station (PNPS) made an 8-hour non-emergency 50.72 notification, Event Notification EN# 45879. The notification was made in accordance with 50.72 (b)(3)(v)(D), Accident Mitigation. Earlier on April 28, 2010, at 1400 hours, a minor oil leak had been identified on the Reactor Core Isolation Cooling (RCIC) system at a lubricating oil vent fitting. The leak was immediately repaired by properly tightening the fitting, then running RCIC to verify no active leak existed. However in the interim, the Shift Manager conservatively declared RCIC inoperable when the high standard for operability could not be assured by initial system engineering judgment for the impact of the oil leak on RCIC system performance in consideration of mission time. Subsequent engineering evaluation concluded that the observed leak, conservatively assumed to be one drop per 3 minutes, would not have impacted RCIC operability for the duration of its required 24 hour mission time. All relevant technical information is documented in the PNPS corrective action system. Therefore PNPS is retracting the event notification EN# 45879. The USNRC Resident Inspector Office has been notified of this retraction. Notified R1DO (Dwyer). |
| ENS 45219 | 21 July 2009 17:15:00 | Unavailability of TSC/OSC Heating, Ventilation and Air Conditioning (HVAC) System. At 1405 hours on Wednesday, July 21, 2009, the Pilgrim Nuclear Power Station (PNPS) Technical Support Center (TSC) / Operations Support Center (OSC) HVAC system was discovered to be nonfunctional. During initial troubleshooting, the breaker providing power to the supply fan mechanically tripped and will not be reset until troubleshooting certifies the breaker is acceptable for use. This event occurred during scheduled preventative maintenance (PM) of the system. Under certain accident conditions, the TSC/OSC may become unavailable due to inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC/OSC personnel to alternate locations. The licensee has notified the NRC Senior Resident Inspector/Resident Inspector. This notification is being made in accordance with 10CFR50.72(b)(3)(xiii) due to the loss of an emergency response facility. The licensee notified the Commonwealth of Massachusetts Emergency Management Agency.
This is a follow-up courtesy notification to EN #45219. All corrective maintenance activities on the TSC/OSC HVAC system are complete and the TSC/OSC is now functional and available for use. The NRC Resident has been notified. The licensee will inform the Commonwealth of Massachusetts Emergency Management Agency. Notified R1DO (Rogge). |
| ENS 44545 | 7 October 2008 03:01:00 | During performance of PNPS Procedure 8.M.2-2.6.3 Attachment 1 step (65) the RCIC System isolated on a Group 5 signal when relay contact blocking devices (boots) were removed. All isolations went to completion. This isolation was not part of the planned evolution. The Group 5 isolation was reset and RCIC was placed in stand by line-up at 2327 on 10/6/2008. Investigation is continuing. The licensee notified the NRC Resident Inspector. |