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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARML12320A0202012-11-14014 November 2012 Update: PNO-I-12-007A Hurricane Sandy Update Causes Oyster Creek Alert and Shutdowns of Reactors at Nine Mile Point Unit 1, Indian Point Unit 3 and Salem Unit 1 PNO-I-12-007, Hurricane Sandy Causes Oyster Creek Alert and Shutdowns of Reactors at Nine Mile Point Unit 1, Indian Point Unit 3, and Salem Unit 12012-10-31031 October 2012 PNO-I-12-007 - Hurricane Sandy Causes Oyster Creek Alert and Shutdowns of Reactors at Nine Mile Point Unit 1, Indian Point Unit 3, and Salem Unit 1 PNO-I-12-005, Oyster Creek Reactor Shutdown and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours2012-07-31031 July 2012 PNO-I-12-005 - Oyster Creek Reactor Shutdown and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours ML1123601032011-08-23023 August 2011 PNO-II-11-005: North Anna, Emergency Declarations Due to Seismic Event PNO-I-09-005, A: Update: Oyster Creek Reactor Trip and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours2009-07-17017 July 2009 PNO-I-09-005A: Update: Oyster Creek Reactor Trip and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours ML0919604862009-07-15015 July 2009 PNO-I-09-005: Exelon Generation Co. Llc., Oyster Creek Reactor Trip and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours PNO-I-09-002, A: Oyster Creek, Update - Shutdown Greater than 72 Hours: Manual Reactor Scram Following Loss of Cooling to Main Transformer, Dated 05/04/20092009-05-0404 May 2009 PNO-I-09-002A: Oyster Creek, Update - Shutdown Greater than 72 Hours: Manual Reactor Scram Following Loss of Cooling to Main Transformer, Dated 05/04/2009 ML0911706642009-04-27027 April 2009 PNO-I-09-002 - Oyster Creek, Shutdown Greater than 72 Hours: Manual Reactor Scram Following Loss of Cooling to Main Transformer PNO-I-09-001, A: Exelon Generation Company, LLC, Update - Oyster Creek Unusual Event and Automatic Reactor Scram Due to Fire in M1A Main Transformer2009-02-0505 February 2009 PNO-I-09-001A: Exelon Generation Company, LLC, Update - Oyster Creek Unusual Event and Automatic Reactor Scram Due to Fire in M1A Main Transformer ML0903304152009-02-0202 February 2009 PNO-I-09-001: Unusual Event and Automatic Reactor Scram Due to a Fire in the M1A Main Transformer at Oyster Creek Station PNO-I-08-013, A - Update - Oyster Creek: Automatic Reactor Scram Due to Main Transformer Fault2008-12-0505 December 2008 PNO-I-08-013A - Update - Oyster Creek: Automatic Reactor Scram Due to Main Transformer Fault ML0833602712008-12-0101 December 2008 PNO-I-08-013: Shutdown Greater than 72 Hrs: Automatic Reactor Scram Due to Main Transformer Fault - Oyster Creek ML0914703712008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Primary Containm ML0914703692008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek Renewal Commitments Related to the Drywall Primary Containm ML0914703702008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywell Primary ML0914703722008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Primary Containm ML0914804412008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Primary Containm ML0914804422008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywall Primary ML0914804432008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywall Primary ML0914804442008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Primary Containm ML0914804452008-11-30030 November 2008 Draft Preliminary Notification of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Primary Containment Drywe ML0914804462008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Facility Amergen Energy Company, LLC, Oyster Creek, Subject - Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywell Primary ML0919605922008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX, Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywell Primary Containment ML0919605932008-11-30030 November 2008 Draft Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-XXX Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywell Primary Containment ML0911907252008-11-17017 November 2008 Preliminary Notification of Event of Unusual Occurrence, PNO-1-08-012; Subject Results of Implementation of Oyster Creek License Renewal Commitments Related to the Drywell Primary Containment, with Hand Written Notes ML0911906532008-11-17017 November 2008 E-mail from K. Heater of USNRC to Various, Regarding PNO-I-08-012: Oyster Creek - Results of Implementation of License Renewal Commitments ML0914606862008-11-14014 November 2008 E-mail from J. Richmond of USNRC to Various, Regarding Oc PNO - Nov 2008 Drywell Rev 3 ML0919004242008-11-0707 November 2008 E-mail from R. Conte of USNRC to J. Richmond, D. Tifft and D. Pelton of USNRC, Regarding Oyster Creek Preliminary Notification(Draft) and Communications Plan, Rev. 1 PNO-I-07-006, A - NRC Resident Inspector - Update - Reactor Scram on Low Reactor Vessel Water Level Due to a Trip of the 'C' Reactor Feed Pump2007-07-23023 July 2007 PNO-I-07-006A - NRC Resident Inspector - Update - Reactor Scram on Low Reactor Vessel Water Level Due to a Trip of the 'C' Reactor Feed Pump ML0719904282007-07-17017 July 2007 PNO-I-07-006: Reactor Scram on Low Reactor Vessel Water Level Due to a Trip of the C Reactor Feed Pump PNO-I-06-012, Oyster Creek, Evaluation of Containment Design Function2006-11-0909 November 2006 PNO-I-06-012: Oyster Creek, Evaluation of Containment Design Function PNO-I-05-022, Alert Declaration at Oyster Creek2005-08-0808 August 2005 PNO-I-05-022 - Alert Declaration at Oyster Creek ML0713401372003-05-22022 May 2003 Reactor Operating Events Event Notification Report, Event Number: 39876; Facility: Oyster Creek; Notification Date: 05/22/2003 PNO-I-03-016, Oyster Creek Bargaining Unit Strike at Oyster Creek (39876)2003-05-22022 May 2003 PNO-I-03-016: Oyster Creek Bargaining Unit Strike at Oyster Creek (#39876) PNO-I-02-020, Unusual Event Due to a Hydrogen Gas Ignition in the Off-Gas System (39348)2002-11-0707 November 2002 PNO-I-02-020: Unusual Event Due to a Hydrogen Gas Ignition in the Off-Gas System (#39348) 2012-07-31
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DCS No.: 05000219110906Date: November 9, 2006PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-1-06-012FacilityLicensee Emergency ClassificationAmerGen Energy Company, LLC______ Notification of Unusual EventOyster Creek ______ Alert Forked River, New Jersey______ Site Area Emergency Docket: 50-219______ General Emergency__X___ Not Applicable
Subject:
EVALUATION OF OYSTER CREEK CONTAINMENT DESIGN FUNCTIONThe NRC staff conducted an extensive on-site review of AmerGen's actions to evaluate (1) thestructural integrity of the primary containment relative to the existing licensing basis in consideration of any actual or potential corrosion, and (2) the significance of water that was identified in two trenches located inside the drywell during the on-going outage at the Oyster Creek Nuclear Generating Station (OCNGS). The NRC review involved a multi-week inspection of AmerGen's inservice inspection program, and included an assessment of license renewal commitments for the current outage and AmerGen's technical evaluation and structural integrity reports associated with the design basis for the primary containment (drywell). In accordance with the NRC's agreement with the State of New Jersey, State Engineers observed portions of the NRC's staff review. Based on the results of the NRC's inspection activities, the NRC concluded that there were no safety significant conditions with respect to the primary containment that would prohibit plant startup, and that there is reasonable assurance that the primary containment is capable of performing its design function throughout the upcoming operating cycle.On November 7, 2006, the NRC staff received a letter from the Rutgers Environmental LawClinic expressing concern that the NRC staff does not have reasonable assurance that the OCNGS meets safety requirements with respect to the drywell. The information provided in the letter was considered and does not alter the NRC staffs reasonable assurance determination. In the mid-1980s, GPU Nuclear (as licensee) identified corrosion of the shell of the OCNGScontainment drywell in the sandbed region. Initial licensee actions were not effective in arresting corrosion, and in 1992, all sand was removed from the sandbed region and the accessible exterior surfaces of the drywell shell were cleaned and coated with an epoxy paint.
Ultrasonic test (UT) measurements of the drywell shell thickness were taken in 1992 and 1996, and indicated that the corrosion had been effectively arrested.On October 16, 2006, OCNGS shut down for a refueling and maintenance outage. Scheduledoutage work included expanded inservice inspection of the drywell shell thickness (UT) and material condition of accessible internal and external portions of the drywell (Visual Testing).During the current outage, AmerGen Energy, LLC (the current licensee) obtained UTmeasurements of drywell shell thickness at many of the same locations as previously examined in the 1990s. UT measurements were taken in the former sandbed region, both inside and outside the drywell, and in two trenches cut into the concrete floor in two bays inside the Preliminary Notificationdrywell. These trenches permit access to the embedded portion of the drywell shell below thesandbed region. In addition, UT measurements were taken at various levels of the drywell shell from inside the drywell (the upper drywell shell is not accessible in these areas from the outside due to the concrete shield building).The NRC staff inspection throughout the outage focused on:
1)Non-destructive examination results of the drywell shell and torus and related AmerGenevaluations. 2)AmerGen's efforts to identify and mitigate the source of water which accumulated in thetrenches in the concrete floor inside the drywell. These efforts included tracer dye testing of the drywell leakage collection trough inside the reactor pedestal, inspection of the drywell sump, inspection and repair of the leakage collection trough, and caulking of the joint between the concrete drywell floor and the steel drywell shell. 3)Structural integrity of the concrete drywell floor and the condition of the embeddedportion of the drywell shell. 4)The potential impact from various repairs to the containment on the design and licensingbases of the drywell.The overall results of the staff's observations and review are:
1)All UT measurements are greater than the calculated minimum code required thicknessfor various plates that form the drywell shell. 2)There are no adverse conditions of the epoxy coating on the outside of the drywell shellin the former sandbed region. 3)Repairs in and around the trough within the reactor vessel pedestal area did not result inany adverse conditions. 4)The water discovered in the drywell trenches had no adverse impact on the structuralintegrity of the concrete floor or the potential for corrosion of the embedded portion of the drywell shell. AmerGen has taken actions to prevent further accumulation of water in this area. 5)There are no adverse conditions with respect to the drywell or torus structural integritythat preclude restart.Based on a review of the technical information, the NRC staff determined that AmerGen hassufficient justification to restart OCNGS.The State of New Jersey has been notified and no further updates are planned.
This PN is being issued for information only and will not be updated.ADAMS Accession Number: ML063130424CONTACT:Ronald R. BellamyRoy L. FuhrmeisterRRB1@nrc.govRLF1@nrc.gov(610) 337-5200(610) 337-5059 Preliminary NotificationDISTRIBUTIONS
- BY E-MAIL:
OWFN TWFNChairman Klein Comm. McGaffigan Jr.NMSS Comm. MerrifieldOIG Comm. JaczkoRES Comm. Lyons
OIP OCA OGC EDO OE NRR SECY Regional OfficesBY FAX: DOT:Trans INPO NSAC RI Resident Office Licensee:AmerGen Energy Company, LLC Oyster Creek Nuclear Generating StationDOCUMENT NAME: C:\FileNet\ML063130424.wpdSUNSI Review Complete: RLF (Reviewer's Initials
)After declaring this document "An Official Agency Record" it will be released to the Public.To receive a copy of this document, indicate in the box:
" C" = Copy without attachment/enclosure " E" = Copy with attachment/enclosure " N" = No copyOFFICERI/DRPRI/DRSRI/DRPRI/DRSNAMERBellamyRConteDLewABloughDATE11/09 /0611/09/06 11/09/06 11/09/06 OFFICERI/PAORI/DRANRROGCNAMEDScrenciMDapasJLubinskyMYoungDATE11/09/0611/09/0611/09/0611/09/06OFFICIAL RECORD COPYRegion I Form 83 (Rev. July 2, 2003)