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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 March 14, 2014 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-14-002A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest 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 CONTROL ROD DRIVE MECHANISM HOUSING FLAWS This Preliminary Notification updates information provided in PNO-III-14-002, associated with the licensees examination of the Control Rod Drive Mechanism (CRDM) housings, consistent with commitments made by the licensee to the Nuclear Regulatory Commission (NRC) following its previous outage. The CRDM housings are part of the reactor coolant system pressure boundary and are designed to prevent reactor coolant from leaking into the containment. The CRDMs are the mechanisms that withdraw and insert the control rods into the reactor and extend from the reactor head to about 14 feet upward.
As a result of these examinations, the licensee identified flaws in 17 of the 45 CRDM housings and replaced all of the CRDM housings with new housings of a different design that is more resistant to developing this type of flaw. One of the 45 CRDM housings was replaced during the previous outage and the remaining 44 housings were replaced during the current refueling outage.
Two NRC resident inspectors, assigned full time on-site to inspect and assess licensee activities, and an NRC regional inspector and subject matter expert, who was pre-staged on-site at the start of the refueling outage, observed the licensees examination of the CRDM housings and continue to evaluate the licensees corrective actions for the identified flaws. Additionally, NRC headquarters and regional experts conducted an independent and detailed review of the licensees technical evaluations and destructive testing of four of the housings with identified flaws. Based upon its independent review and assessment, the NRC concluded that the CRDM housings structural integrity was not compromised while the plant was operating.
The NRC will document its conclusions in a publicly available inspection report.
The State of Michigan has been notified.
The information in this preliminary notification is current as of 11:00 a.m. (EDT) on March 14, 2014.
PNO-III-14-002A This information has been reviewed with plant management.
This preliminary notification is issued for information only and no further action by the staff is anticipated.
ADAMS Accession Number: ML14073A612 Contacts: Eric R. Duncan Alex Garmoe 630-829-9620 269-764-8971 Eric.Duncan@nrc.gov Alex.Garmoe@nrc.gov