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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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Preliminary Notification DCS No.: 0500021911XX08 Date:. November 17, 2008 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-1-08-XXX Facility Licensee Emergency Classification AmerGen Energy Company, LLC __ Notification of Unusual Event Oyster Creek Alert Forked River, New Jersey __ Site Area Emergency Docket: 50-219 General Emergency,,:
X Not Applicable
Subject:
RESULTS OF IMPLEMENTATION OF OYSTER CREEK LICENSE RENEWAL COMMITMENTS RELATED TO THE DRYWELL PRIMARY CONTAINMENT The NRC staff is performing an inspection of AmerGen's actions related to license renewal commitments, which were implemented during the 2008 refueling outage at the Oyster Creek Nuclear Generating Station (OCNGS). The NRC staff completed its on-site portion 6f a multi-week inspection of AmerGen's three aging management programs associated with the drywell primary containment: Containment Metallic Liner Inservice.Inspection; Structures Monitoring Program; and Protective Coating Monitoring and Maintenance Program. In'accordance with the NRC's agreement with the State of New Jersey, State Engineers observed portions of the NRC staff review. Based on the results of the NRC's inspection activities to date, the NRC staff concluded there were no safety significant conditions with respect to, the drywell containment that would prohibit plant startup.
In the mid-1980s, GPUNuclear (previous licensee) identified corrosion of the drywell containment steel shellIiin the sand bed region. Initial licensee actions were not effective in arresting the corrosi~o, In 1992, all sand was removed from the sand bed region and the accessible exterior su~fc~es of the drywellshell werecleaned and coated with epoxy. Ultrasonic test (UT) thickness measurements of the' drywell shell taken in 1992 and 1996 indicated the corrosion had been effectively arrested. This information was confirmed by UT measurements in 2006, during a refueling outage.
On October 24, 2008, OCNGS shut down for a scheduled refueling and maintenance outage.
Outage work included implementation'of various license renewal aging management programs.
During the 2008 refueling outage, the NRC's drywell shell inspection focused on:
- 1. Results of drywell shell UT thickness measurements.
- 2. Direct observation of drywell shell conditions both inside the drywell, including the floor trenches, and outside the drywell, in the sand bed regions.
- 3. Condition and integrity of the drywell shell epoxy coating, including AmerGen's activities to evaluate and repair one small broken blister (with a small rust stain) and three small unbroken blisters (initially described as surface bumps) found in Bay-1 1, during the outage.
- 4. Condition and integrity of the drywell shell moisture barrier seal between the shell and the sand bed floor, including AmerGen's activities to evaluate and repair small cracks in moisture barrier seals in multiple sand bed bays, and a small seal crack in Bay-3 which also exhibited small rust stains.
- 5. AmerGen's activities to monitor, evaluate, and mitigate water leakage from the reactor refueling cavity onto the external surface of the drywell shell and into the sand bed regions.
G:\DRS\Engineering Branch 1\Richmond\_FOIA 2009-0070\to be done - Exemption 5\OC PNO Nov- i-Lt 2008_Drywell-rev-4a.doc
Preliminary Notification With respect to AmerGen's implementation of license renewal commitments, the NRC staff has concluded:
- 1. All drywell shell UT thickness measurements satisfied AmerGen's acceptance criteria and current licensing basis design requirements.
- 2. There were no identified significant conditions affecting the drywell shell structural integrity.
- 3. AmerGen's inspection of the as-found condition of the external drywell shell epoxy coating, in the sand bed regions, was acceptable. Four small blisters (three of which were initially identified as bumps) on the coating in Bay-1 1 were identified and repaired. AmerGen reported that some blistering was expected, and would be identified;,during routine visual examinations. The NRC staff will review AmerGen's apparent cause evaluation after it is completed.
- 4. AmerGen's inspection of the as-found condition of the external drywell shell moisture barrier seal, between the shell and the sand bed floor, was acceptable. Surface cracks, which did not appear to completely penetrate the seal, were identified in multiplebays, and were repaired. During one crack repair in Bay-3, some drywell shell surface' corrosion was also identified and repaired.
- 5. AmerGen's activities to monitor and mitigate water leakage from the reactor refueling cavity onto the external surface of the drywell shell and into the sand bed regions are still under evaluation.
During the outage, water leakage from ithereactor refueling cavity into the cavity drain trough, as monitored in the trough's drain line, increased from less than 1 gallon per minute (gpm) to approximately 4 to 6 gpm. Some of the water in the cavity drain trough spilled into the gap between the steel shell and the concrete shield wall;,!and ultimately into the sand bed regions.
AmerGen enhanced its leakage monitoring and performed: visual inspections to detect any water entry. Small water puddles were identified in ,several sand bed bays. After the cavity was drained, AmerGen performed direýc inspections Ifthe sand bed bays, and no significant adverse conditions were identified.
AmerGen identified andfixed the! problem's found isand beds Bay-3 and Bay-i 1, as part of their aging managementprbqgiaap mplementation The drywell shell epoxy coating and the moisture barrier seal, both innthe sand bed regi~ifitare barrier systems used to protect the dryweli shell from corrosion. Th*e!problems identified with these barriers had a minimal impact on the drywell steel shell and thpýipo',jected shell corrosion rate remains very small, as confirmed by NRC staff review of UT data.
Based on a review of the technical information, the NRC staff determined AmerGen has provided an adequate basis to conclude the drywell primary containment will remain operable during the period until the next scheduled examination.
The information presented herein has been discussed with AmerGen and is current as of November 17, at xxx p.m.
The State of New Jersey has been notified.
This Preliminary Notification is being issued for information only and will not be updated.
ADAMS Accession Number: ML .....................
CONTACT: Richard J. Conte John Richmond (anrc.gov (Dnrc.gov (610) 337-5183 (610) 337-5220 G:\DRS\Engineering Branch 1\Richmond\_FOIA 2009-0070\to be done - Exemption 5\OC PNO Nov-2008_Drywellirev-4a.doc