ML110180609
| ML110180609 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/05/2011 |
| From: | Duke Energy Carolinas |
| To: | NRC/RGN-II |
| Shared Package | |
| ML110180609 | List: |
| References | |
| Download: ML110180609 (10) | |
Text
OFFICIAL USE ONLY - SECUR Oconee Nuclear Statio Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY Major Major Project Project RITY RELATED INFORMATON Project Project Plans Plans January 5, 2011 on sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
Regulatory Status Interim Actions in place; enforc Work ongoing to achieve comm Analysis parameters for base Safety significance Project Status All Interim Actions implemente Self Assessment of Interim Act OFFICIAL USE ONLY - SECUR NRC Inspection of Interim Acti FERC Stop Work on tempora Design study of potential modif Need confirmation of design in Parallel work has eliminated so Risk Benefit Small (<1E-06 / yr) - actual risk Cost
~$ 4 M to date - analyses and Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY External Flood External Flood ced by CAL mon understanding of; case, and d per commitments tions completed in May 2010 RITY RELATED INFORMATON p
y ons completed in June 2010 ary Intake Diversion Wall cleared fications nearing completion puts ome options and focused efforts k improvement interim actions only 2
sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
No.
Compensatory Meas 1
Perform flooding studies using the Hydrologic Engineering Ce RAS) model for comparison with previous DAMBRK models to heights in the west yard following a postulated failure of the Jo 2
Maintain plans, procedures (Jocassee and Oconee) and guida address mitigation of postulated flood events which could rend and are consistent with current perspectives gained following subsequent 2D inundation studies. To the extent practical, th extensive plant damage scenario (B.5.b) equipment methods Duke Energy Hydro generation will create a guidance docume OFFICIAL USE ONLY - SECUR 3
Duke Energy Hydro generation will create a guidance docume storm management processes. (includes the Jocassee Develo 4
Maintain a dam safety inspection program that includes: (1) w Jocassee Dam by Duke Energy personnel, (2) dam safety ins rainfall or felt seismic event, (3) annual dam safety inspections inspections by FERC representatives, (5) five year safety insp (6) five year underwater inspections.
5 Maintain a monitoring program that includes: (1) continuous r Operating Center in Charlotte, NC, (2) monthly monitoring of seepage monitoring points, and (4) annual surveys of displace 6
Assign an Oconee engineer as Jocassee Dam contact to heig 7
Install ammeters and voltmeters on Keowee spillway gates fo Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY External Flood External Flood CAL Commitments CAL Commitments sures Implementation Status enter-River Complete Analysis System (HEC-o more accurately represent anticipated flood ocassee Dam.
Complete ance documents implemented (Oconee) to der the Standby Shutdown facility inoperable the HEC-RAS sensitivity studies and the e mitigation strategy is similar to existing and criteria.
Complete ent to consolidate river management and C
RITY RELATED INFORMATON ent to consolidate river management and opment and the Keowee Development.)
Complete weekly dam safety inspections of the spections following any 2-inch or greater s by Duke Energy, (4) annual dam safety pections by FERC approved consultants, and Complete remote monitoring from Hydro Central observation wells, (3) weekly monitoring of ement monuments.
Complete ghten awareness of Jocassee Dam status.
Complete r equipment condition monitoring.
Complete 3
sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
No.
Compensatory Meas 8
Ensure forebay and tailrace level alarms are provided for Joc developing dam failure.
9 Add a storage building adjacent to the Jocassee spillway to h equipment (e.g., compressor and air wrench).
10 Obtain and stage a portable generator and electric drive mot serve as a second set of backup spillway gate operating equ OFFICIAL USE ONLY - SECUR 11 Conduct Jocassee Dam failure Table Top Exercise with Oco response procedures.
12 Instrument and alarm selected seepage monitoring locations conditions.
13 Provide additional video monitoring of Jocassee Dam (e.g. d timely assessment of degrading conditions 14 Add equipment to provide third means of operating Jocassee 15 Conduct Jocassee Dam/Oconee Emergency Response Orga response procedures.
Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY External Flood External Flood CAL Commitments CAL Commitments sures Implementation Status cassee to support timely detection of a Complete house the backup spillway gate operating Complete tor near the Jocassee spillway gates to uipment.
Complete RITY RELATED INFORMATON onee participation to exercise and improve Complete s for timely detection of degrading Complete am toe, abutments, and groin areas) for Complete e spillway gates Complete anization Drill to exercise and improve Complete 4
sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
Study has been pursued in parallel with implementation of Compensatory Measures.
Sensitivity analyses have eliminated some potential solutions C
OFFICIAL USE ONLY - SECUR Compatibility with other safe shutdown strategies (Fire, HELB, tornado) factored into consideration of potential solutions First milestone has not been met Fr Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY Feasibility /
Feasibility /
onstructability Study onstructability Study RITY RELATED INFORMATON 5
rom 12/2/2009 presentation sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
Disposition of concepts f Flood Mitigation device Canal Required hardening of back Did NOT resolve second pe C
OFFICIAL USE ONLY - SECUR p
Downstream modificatio to smooth flow through t Sensitivity study demonstra from consideration Assured integrity of port Dike to preclude failure Temporary wall in place; pe Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY from 11/30/09 letter located in the Oconee Intake k side of Intake Dike to prevent erosion eak flooding of west yard Feasibility /
Feasibility /
onstructability Study onstructability Study RITY RELATED INFORMATON g
y ons (earth removal) to flood zone the Keowee Tailrace ated little benefit and high cost; eliminated tion of the Oconee Intake Canal of the dike toward the SSF ermanent wall listed in 11/29/10 letter 6
sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
Disposition of concepts f Diversion Wall located o Intake Canal Dike Temporary wall in place; pe C
OFFICIAL USE ONLY - SECUR Protection of the SSF fo Purchase specification for s Increase in wall height was Use of 100 kV line to power Listed in 11/29/10 letter Water retaining structure adjacent to the World of Permanent wall installed Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY from 11/30/09 letter on the north rim of the Oconee ermanent wall listed in 11/29/10 letter Feasibility /
Feasibility /
onstructability Study onstructability Study RITY RELATED INFORMATON or higher inundation levels submarine doors developed also considered; submarine doors preferred r SSF instead of diesel increases margin e/wall/raised roadbed in swale f Energy Visitors Center 7
sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
C List of modifications in 11/29/
Provide a flood diversion wal Intake Dike. (requires appro Commission (FERC))
Provide a flood protected (i.e postulated inundation) offsite OFFICIAL USE ONLY - SECUR Withhold from Public Disclos For Informa postulated inundation) offsite sufficient to support operatio reliance on operation of the S Provide flood protection for S Components (SSCs), exclud support systems, sufficient to their safe shutdown functions are expected to operate.
Provide makeup water to and sufficient to support extended spent fuel pools in a safe con OFFICIAL USE ONLY - SECURITY Feasibility /
Feasibility /
onstructability Study onstructability Study
/2010 letter ll on the north portion of the Oconee val by the Federal Energy Regulatory
- e. will be available during and after the e electrical power source to the SSF RITY RELATED INFORMATON 8
sure under 10 CFR 2.390 tion Only e electrical power source to the SSF n of the SSF related equipment without SSF diesel generator.
SSF related Structures, Systems, and ing the SSF diesel generator and its o ensure they are capable of performing s for the flood conditions in which they d boration of the spent fuel pools d operation of the SSF and maintain the ndition.
Y RELATED INFORMATON
April 2011 Submittal Content Modification Descriptions Design Inputs Scope Description Implementation Schedule To meet schedule team is C
OFFICIAL USE ONLY - SECUR To meet schedule, team is as described in 8/20/2010 s Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY ts moving forward with assumption that Case 2 Feasibility /
Feasibility /
onstructability Study onstructability Study RITY RELATED INFORMATON moving forward with assumption that Case 2, submittal, is base case.
9 sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON
NRC OFFICIAL USE ONLY - SECUR Duke Energy Withhold from Public Disclos For Informa OFFICIAL USE ONLY - SECURITY Action Items and Action Items and Closing Remarks Closing Remarks RITY RELATED INFORMATON 10 sure under 10 CFR 2.390 tion Only Y RELATED INFORMATON