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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 55261 | 17 May 2021 16:38:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Unusual Event Due to a Fire Alarm Inside the Drywell | (Peach Bottom Atomic Power Station declared an unusual event due to a) "receipt of a single fire alarm in the Unit 2 drywell and the existence of the fire not verified in less than 30 minutes of alarm receipt." The NRC Resident Inspector and State and Local Authorities were notified. Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
At 1355 EDT, the licensee terminated the notification of unusual event. The basis for termination was that the smoke has dissipated and there were no signs of fire. The licensee notified State and Local Authorities and the NRC Resident Inspector. Notified R1DO (Grieves), NRR EO (Miller), and IRD MOC (Grant). Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), FEMA NRCC THD (email) and FEMA NRCC SASC (email).
Peach Bottom Atomic Power Station is retracting notification EN 55261, 'Peach Bottom - Unusual Event,' based on the following additional information not available at the time of the notification: Following a Unit 2 drywell inspection, analysis of temperature data, and evaluation of equipment in operation; it was concluded that a fire did not exist. The smoke's most likely apparent cause was the result of heating residual oil/grease in the drywell. Peach Bottom reported the condition and entry into the UE initially based on the available information at the time and to ensure timeliness with emergency declaration and reporting notification requirements. The licensee has notified the NRC Resident Inspector. Notified R1DO (Ferdas). | ||
| ENS 54340 | 21 October 2019 04:50:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Unusual Event Declared Due to No Control Rod Movement with Manual Scram Actuation | While Unit 3 was shutting down for 3R22 refueling outage, the mode switch was taken to shutdown position which is a manual scram signal. The manual scram signal was not received from the mode switch. A subsequent manual scram was inserted with the use of the manual scram push buttons. The Unit 3 reactor is shutdown with all rods inserted. Unit 2 was unaffected by the event and remains in Mode 1 at 100 percent power. The licensee notified the NRC Resident Inspector, Pennsylvania and Maryland State Agencies, local government. A media press release is planned. Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email), FEMA Region 3 Watch Office (email).
Conditions no longer meet an Emergency Actuation Level and will not deteriorate. Unit 3 reactor is shutdown with all control rods fully inserted. The NOUE was terminated at 0230 EDT." The licensee notified the NRC Resident Inspector, Pennsylvania and Maryland State Agencies, local government. Notified the R1DO (Jackson), NRR EO (Miller), IRDMOC (Gott), R1RA (Lew via email), NRR (Nieh via email), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email), FEMA Region 3 Watch Office (email). | Control Rod | |
| ENS 47183 | 23 August 2011 18:01:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Notification of Unusual Event Due to Seismic Event | PBAPS (Peach Bottom Atomic Power Station) Units 2 and 3 experienced a seismic event which was felt in the control room in conjunction with a seismic trigger alarm set a 0.01G acceleration. The operating basis earthquake alarm of 0.05G was not received. 'Both units continue to operate at pre-event levels. Currently there is no indication of damage at the site. Initial plant walkdowns indicate no plant damage and walkdowns are continuing. There were no personnel injuries. The licensee has notified the NRC Resident Inspector.
At 1750 hrs. EDT, Peach Bottom terminated the Unusual Event that was declared at 1401 today due to a seismic event that occurred at the station. Both Unit 2 and 3 operational walk downs of the site have been completed. There are no issues related to the seismic event which would impact continued safe operation of either unit. The licensee has made state and local notifications as well as notifying the NRC Resident Inspector. Notified R1 IRC (Dentil), IRD (Gott), DHS, FEMA, HHS, USDA. | ||
| ENS 43556 | 8 August 2007 19:25:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Alert Declared to Due Potential Hazardous Atmosphere in a Emergency Diesel Generator Room | While the licensee was conducting maintenance activities in the E3 Emergency Diesel Generator (EDG) room, a CO2 fire extinguisher was observed to be leaking. Personnel were evacuated from the room due to a potential hazard from CO2 buildup in the room. The licensee was initially unable to determine the concentration of Oxygen or CO2 in the EDG room but made a decision to declare an Alert at 1536 EDT in accordance with EAL H.A.7, "Life Threatening Atmosphere Potential. The licensee does not consider the condition a threat to plant operation. State and local authorities have been notified. The licensee has also notified the NRC Resident Inspector. The licensee anticipates that a press release will be issued.
The licensee terminated the Alert at 1653 EDT base on Oxygen concentrations in the E3 EDG room above 20% and confirmation that Oxygen levels in the other 3 EDG bays (4 total) also confirmed above 20%. State and local authorities have been notified. The licensee will notify the NRC Resident Inspector. R1DO (Summers), IRD (Cruz), and NRR EO (Ruland) notified. The following offsite agencies were notified of the Alert termination: DHS (Akers); FEMA (Bisco); DOE (Turner); and USDA (Leadbetter). | Emergency Diesel Generator | |
| ENS 43189 | 27 February 2007 14:41:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Fire Inside the Unit 3 Turbine Area Load Center | At 0941 the licensee declared an unusual event at the site due to a fire in the protected area not extinguished in less than 15 minutes (EAL HU-6). The fire is located in the Unit 3 Turbine Area Load Center cubicle. The fire has affected Unit 3 bus duct cooling so the licensee is currently reducing power. The fire is currently out but the licensee is assessing conditions in the area. The licensee will do a thorough analysis of the affected load center to determine the extent of damage before officially exiting the unusual event. All emergency diesel generators and emergency core cooling systems are fully-operable and available if needed. The licensee has notified the NRC Resident Inspector.
Unusual Event exited at 1137 EST. R1DO (Rogge), NRR EO (M.J. Ross-Lee), IRD Manager (T. Blount), FEMA (Fuller) and DHS SWO (Haselton) notified. | Emergency Diesel Generator Emergency Core Cooling System | |
| ENS 42887 | 7 October 2006 22:02:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Unusual Event - Loss of Containment Integrity | During testing, a small crack (3"- 4" axial crack) was identified on a return line to the torus for both HPCI and RCIC (steam driven ECCS systems). The valve upstream of the leak has been closed, however, the leak is still unisolable between that valve and the torus. This plant condition does not threaten public safety. The licensee notified the NRC Resident Inspector, as well as State and local agencies.
This is a follow up notification to EN# 42887. Peach Bottom Atomic Power Station Terminated the Unusual Event at 0513 (EDT) on 10/08/06. Unit 2 is currently shutdown in Mode 4. In Mode 4, Primary Containment is no longer required. The licensee notified the NRC Resident Inspector, State and Local agencies. Notified R1DO (Krohn), R1 (Dapas), NRREO (Quay), NRR (Dyer, Weber), IRD (Blount), DHS (Gray), FEMA (Dunker). | Primary containment | |
| ENS 42779 | 15 August 2006 22:14:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Unusual Event Due to Fire on Roof of Edg Building | During a 24 hour endurance run of the E3 Emergency Diesel Generator (EDG), a small fire occurred on the roof of the E3 EDG Building. Fire reported at 1759, UE declared at 1814. E3 was approximately 19 hours into the full load run. E3 was immediately shut down. As of 1835 the fire was reported out and no offsite assistance was required. The licensee is investigating the cause of the fire. The licensee notified the NRC Resident Inspector.
Licensee terminated the Unusual Event at 2040. Conditions to secure were that the fire was out and overhauled and the E3 EDG fuel racks tripped. The E3 EDG is considered inoperable and not available (14 day shutdown LCO). The licensee will notify the NRC Resident Inspector. Notified R1DO (R. Lorson), NRR EO (P.T. Kuo), IRD (P. Wilson), DHS (M. Charter), FEMA (D. Barden)
The licensee will be issuing a press release about the Unusual Event. R1DO( Lorson) notified. | Emergency Diesel Generator | |
| ENS 40158 | 15 September 2003 06:39:00 | 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Dual Unit Reactor Scram. Discretionay Unusual Event Declared | A discretionary UE has been declared for PB (Peach Bottom) U/2 (Unit 2) and U/3 (Unit 3) due to a dual unit transient that has resulted in both unit's scramming with a Group 1 (Main Steam Isolation Valve closure) PCIS isolation. An electrical transient caused all 4KV emergency buses to be powered by the diesel generators. One diesel generator (E2) subsequently tripped leaving 6 of 8 (3 per unit) buses energized. Off-site power is available. Preparations for transfer back to off-site power is in progress. The U/3 (Unit 3) "D" SRV (Safety relief valve) opened and did not close until electrically deenergized. The SRV is closed at this this time.' Both reactors scrammed at 0132 EDT. NRC Resident Inspectors, State and Local were notified by the licensee.
Unusual Event for Peach Bottom Nuclear Power Station Units 2 & 3 was terminated at 1046 EDT. Unusual Event was terminated because plant conditions have been stabilized, offsite electrical power has been restored to the plant and both plants being in cold shutdown in Mode 4. An investigation is in progress. State and Local will be notified by the licensee. R1DO (M. Shanbaky), NRR EO (C. Holden), DIRO Manager (Doug Weaver), FEMA (Jim Dunker), DHS (Mark Babb) & R4DO (T. Gody) notified. The NRC Resident Inspectors are onsite and have been informed of the termination of the unusual event by the licensee. | Main Steam Isolation Valve Safety Relief Valve |