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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 January 30, 2014
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE
- PNO-III-14-002
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:
PALISADES CONTROL ROD DRIVE MECHANISM HOUSING FLAWS On January 29, 2014, Entergy Nuclear Operations, Inc., notified the NRC that the licensee found flaws during planned examinations of control rod drive mechanism (CRDM) housings that required further review and evaluation. The CRDMs are part of the reactor coolant system boundary designed to prevent reactor coolant from leaking into the containment. At present, there is no evidence of leakage. The examinations were conducted in accordance with the licensee's corrective actions following a leak from a CRDM housing in 2012.
The plant is currently shut down for a refueling outage. This issue has no adverse effect on plant or public safety.
Two resident inspectors are assigned to the site full-time to inspect and assess all licensee activities. To supplement the resident inspectors' efforts during the refueling outage, the NRC has two specialist inspectors on site to inspect and assess the plant's outage activities. One of these specialist inspectors was on site to specifically observe the CRDM housing examinations.
This NRC specialist continues to independently inspect and evaluate the licensee's response.
There are 45 CRDMs, one associated with each control rod. The control rods, when inserted into the reactor, are designed to absorb neutrons to control the nuclear reaction. The CRDMs extend from the reactor head to about 14 feet upward, and are the mechanisms that withdraw and insert the control rods. The flaws are in the CRDM housings above the reactor head, and not in the reactor head itself.
After inspecting all 45 CRDM housings, the licensee concluded that there are flaws in 17 of the
45 housings.
NRC inspectors have been reviewing the plant's inspections and assessments and are reviewing the licensee's replacement and repair plans, which will be completed prior to plant startup. The NRC will continue to evaluate and va lidate the licensee's response to the issue to ensure plant safety. 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 10:00 a.m. EST on January 30, 2014.
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: ML14030A190
Contacts: Eric R. Duncan Thomas Taylor 630-829-9620 269-764-8971
Eric.Duncan@nrc.gov Thomas.Taylor@nrc.gov