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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-III-19-002, Palisades, Through-Wall Leak Identified on a Reactor Vessel Head Nozzle2018-11-14014 November 2018
PNO-III-19-002: Palisades, Through-Wall Leak Identified on a Reactor Vessel Head Nozzle
PNO-III-19-001, Maintenance Outage to Repair Control Rod Drive and Failed Transformer2018-10-18018 October 2018
PNO-III-19-001: Maintenance Outage to Repair Control Rod Drive and Failed Transformer
PNO-III-14-002, A: Update, Palisades Control Rod Drive Mechanism Housing Flaws2014-03-14014 March 2014
PNO-III-14-002A: Update, Palisades Control Rod Drive Mechanism Housing Flaws
ML14030A1902014-01-30030 January 2014
PNO-III-14-002: Palisades Control Rod Drive Mechanism Housing Flaws
PNO-III-13-004, B, Update - Palisades Shutdown Due to Safety Injection Refueling Water Tank (SIRWT) Leakage2013-06-17017 June 2013
PNO-III-13-004B, Update - Palisades Shutdown Due to Safety Injection Refueling Water Tank (SIRWT) Leakage
ML13129A4382013-05-0909 May 2013
PNO-III-13-004A - Update: Palisades Shutdown Due to Safety Injection Refueling Water Storage Tank (SIRWT) Leakage
ML13126A2702013-05-0606 May 2013
PNO-III-13-004 - Palisades Shutdown Due to Safety Injections Refueling Water Storage Tank Leakage
PNO-III-13-002, A - Update - Palisades Shutdown Due to Leakage from the Component Cooling Water (CCW) System2013-02-22022 February 2013
PNO-III-13-002A - Update - Palisades Shutdown Due to Leakage from the Component Cooling Water (CCW) System
ML13046A4042013-02-15015 February 2013
PNO-III-13-002, Palisades Shutdown Due to Leakage from the Component Cooling Water (CCW) System
ML12314A2712012-11-0909 November 2012
PNO-lll-12-015A (Update) Palisades Shutdown Due to Leakage from the Main Steam System
ML12310A5052012-11-0505 November 2012
PNO-lll-12-015, Palisades Shutdown Due to Leakage from the Main Steam System
PNO-III-12-012, Palisades Leakage from the Service Water System2012-09-25025 September 2012
PNO-III-12-012: Palisades Leakage from the Service Water System
PNO-III-12-007, A, Update, Palisades Shutdown Due to Increase in Unidentified Reactor Coolant System Leakage2012-08-30030 August 2012
PNO-III-12-007A, Update, Palisades Shutdown Due to Increase in Unidentified Reactor Coolant System Leakage
PNO-III-12-004, A: Update - Palisades Shutdown Due to Safety Injection Refueling Water Storage Tank Leakage2012-07-11011 July 2012
PNO-III-12-004A: Update - Palisades Shutdown Due to Safety Injection Refueling Water Storage Tank Leakage
ML12166A2612012-06-14014 June 2012
PNO-III-12-004 - Palisades Shutdown Due to Safety Injection Refueling Water Storage Tank Leakage
PNO-III-11-011, A - Palisades Reactor Trip (Update)2011-10-0303 October 2011
PNO-III-11-011-A - Palisades Reactor Trip (Update)
ML11269A2302011-09-26026 September 2011
PNO-III-11-011 Palisades Nuclear Plant Reactor Trip
PNO-III-11-010, Palisades - Unplanned Shutdown Greater than 72 Hours and Notification of Unusual Event2011-09-19019 September 2011
PNO-III-11-010 - Palisades - Unplanned Shutdown Greater than 72 Hours and Notification of Unusual Event
ML1123601032011-08-23023 August 2011
PNO-II-11-005: North Anna, Emergency Declarations Due to Seismic Event
PNO-III-11-003, Palisades Shutdown Due to Loss of Main Generator Electrical Load2011-01-24024 January 2011
PNO-III-11-003, Palisades Shutdown Due to Loss of Main Generator Electrical Load
PNO-III-11-001, ; Palisades, Unusual Event and 72-Hour Limiting Condition for Operation Due to 4160 V Ground Fault2011-01-11011 January 2011
PNO-III-11-001; Palisades, Unusual Event and 72-Hour Limiting Condition for Operation Due to 4160 V Ground Fault
PNO-III-10-010, A: Update - Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rod Drive Seal2010-07-0606 July 2010
PNO-III-10-010A: Update - Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rod Drive Seal
ML1017605222010-06-25025 June 2010
PNO-III-10-010 - Palisades - Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rod Drive Seal
PNO-III-09-001, A - Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rob Drive Seal (Update)2009-02-23023 February 2009
PNO-III-09-001A - Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rob Drive Seal (Update)
ML0904905272009-02-18018 February 2009
PNO-III-09-001, Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rod Drive Seals
PNO-III-08-008, A - Palisades - Forced Shutdown to Replace Leaking Control Rod Drive (CRD) Seal Packages (Update)2008-08-11011 August 2008
PNO-III-08-008A - Palisades - Forced Shutdown to Replace Leaking Control Rod Drive (CRD) Seal Packages (Update)
ML0822003472008-08-0707 August 2008
PNO-III-08-008 - Palisades Forced Shutdown to Replace Leaking Control Rod Drive Seals
PNO-III-08-004, A, Cook and Palisades, Update - Unusual Events Declared Due to Earthquake2008-04-18018 April 2008
PNO-III-08-004A, Cook and Palisades, Update - Unusual Events Declared Due to Earthquake
ML0810903102008-04-18018 April 2008
PNO-III-08-004: Cook & Palisades, Unusual Events Declared Due to Earthquake
PNO-III-07-006, A: Palisades, Shutdown Due to Low Steam Generator Level (Update)2007-05-14014 May 2007
PNO-III-07-006A: Palisades, Shutdown Due to Low Steam Generator Level (Update)
ML0712905812007-05-0909 May 2007
PNO-III-07-006: Palisades Shutdown Due to Low Steam Generator Level
PNO-III-07-003, A - Palisades: Shutdown to Replace Heat Damaged Cables (Update)2007-03-0505 March 2007
PNO-III-07-003A - Palisades: Shutdown to Replace Heat Damaged Cables (Update)
ML0705805222007-02-27027 February 2007
PNO-III-07-003: Palisades - Palisades Shutdown to Replace Heat-Damaged Cables
PNO-III-06-013, Palisades Shutdown to Investigate Control Rod Withdrawal Problem2006-05-11011 May 2006
PNO-III-06-013: Palisades Shutdown to Investigate Control Rod Withdrawal Problem
PNO-III-04-010, Palisades Shut Down to Repair Control Rod Drive Mechanism Leakage2004-08-11011 August 2004
PNO-III-04-010: Palisades Shut Down to Repair Control Rod Drive Mechanism Leakage
PNO-III-03-040, Fire Adjacent to Palisades Nuclear Generating Station2003-09-22022 September 2003
PNO-III-03-040 - Fire Adjacent to Palisades Nuclear Generating Station
PNO-III-03-014, B: Palisades Loss of Shutdown Cooling Caused by Loss of Offsite Power (Second Update)2003-03-28028 March 2003
PNO-III-03-014B: Palisades Loss of Shutdown Cooling Caused by Loss of Offsite Power (Second Update)
ML0308605932003-03-27027 March 2003
PNO-III-03-14A: Palisades Loss of Shutdown Cooling Caused by Loss of Offsite Power (Update)
PNO-III-03-013, Alert Declared Due to Fire with Potential to Affect Safety Systems2003-03-19019 March 2003
PNO-III-03-013: Alert Declared Due to Fire with Potential to Affect Safety Systems
2018-11-14
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PRELIMINARY NOTIFICATION - REGION III June 17, 2013 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-13-004B This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest or significance. Some of the information may not yet be fully verified or evaluated by the Region III staff.
Facility Licensee Emergency Classification Palisades Nuclear Plant __ Notification of Unusual Event Entergy Nuclear Operations, Inc. __ Alert Covert, Michigan __ Site Area Emergency Docket: 05000255 __ General Emergency License: DPR-20 X Not Applicable
SUBJECT:
UPDATE - PALISADES SHUTDOWN DUE TO SAFETY INJECTION REFUELING WATER TANK (SIRWT) LEAKAGE This Preliminary Notification updates information provided in PNO-III-13-004A, which discussed the Palisades plant shutdown on May 5, 2013. Operators shut down the plant after they discovered SIRWT leakage of about 90 gallons per day (gpd) while monitoring the tank. This exceeded the 38 gpd limit to shut down that was established in the NRC's confirmatory action letter (CAL EA 12-155; ADAMS No. ML12199A409).
The SIRWT is not used for daily plant operations. The tank, which contains a minimum of 250,000 gallons, is a source of borated water for activities during refueling outages and supplies the Emergency Core Cooling and the Containment Spray Systems during emergencies.
About 80 gallons of low radioactivity water spread onto the roof, down roof drains, into drains that go to Lake Michigan. The released radioactivity to Lake Michigan is well below regulatory limits and did not impact the safety of plant workers or the public. The amount of radiation to a member of the public from the 80-gallon spill is estimated to be less than 0.000002 rem, with the federal limit to a member of the public being 0.1 rem. Thus, the estimated release constitutes less than one-fifty thousandth (1/50,000) of the federal limit. NRC radiation exposure limits are based on the best available international scientific research and continue to be reviewed when new information comes to light. There is no negative health impact anticipated at or below the limit.
Update: The NRC independently verified that Entergy has repaired the leak and the plant is safe to operate. The repairs included replacing the bottom of the tank and replacing all welds associated with the floor inside the tank.
The resident inspectors responded to the site after being notified the plant was shutting down due to the leak. The NRC sent specialists with backgrounds in materials engineering to inspect the plants detailed actions to identify and repair the leak. The NRC had additional inspectors review and assess the plants testing and repair plan, look into the area beneath the tank, understand the stresses on the tank, review the root cause of the leak, and
PNO-III-13-004B observe the actual welding and testing of the tank components. In total, 10 NRC inspectors performed a wide range of inspection activities to ensure the leak had been repaired and that the public and plant workers continue to be safe. Radiation Protection specialists from the Region and headquarters evaluated the radiological aspects of the leak. Sand samples taken by the licensee near the plant discharge indicated no radionuclides associated with the operation of Palisades. The NRC independently obtained sand samples and an analysis was conducted at an independent laboratory. The NRC analysis of the independent laboratory results so far has not identified any radionuclides associated with the operation of Palisades.
NRC Region III also continued its commitment of being open and transparent by publicly documenting phone call discussions between Entergy and NRC management on this issue.
Additionally, the region held a webinar on releases, originally planned for later in the year, in which Region III staff addressed the publics questions and concerns about the tank leak.
During replacement of the tanks bottom, it was discovered that the sand bed designed to cushion the tank bottom was absent. The licensee corrected the condition by installing fiber board underneath the tank. The original construction code allows the use of this fiber board.
The NRC will review this issue related to the past design in a follow up inspection.
The SIRWT has been refilled and there is currently no leakage.
Going forward, the NRC will continue to make sure the tank remains safe. We will independently inspect the areas around the tank where leaks have been previously identified and will follow Entergys actions to monitor the tank. If a leak is discovered, we expect Entergy to evaluate it in accordance with the NRCs rules and take appropriate action.
On June 17, 2013, the Palisades plant resumed operation after the repairs were completed.
The reactor was made critical at 10:34 p.m. (EDT) on June 16, and the main generator was synchronized to the grid at 2:08 p.m. (EDT) on June 17, 2013. These startup activities were monitored by the NRC resident inspectors.
The State of Michigan has been notified.
The information in this preliminary notification is current as of 3:00 p.m. (EDT) on June 17, 2013. This information has been reviewed with plant management.
ADAMS Accession Number: ML13168A575 Contacts: John B. Giessner Thomas Taylor 630-829-9619 269-764-8971 John.Giessner@nrc.gov Thomas.Taylor@nrc.gov
