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| {{#Wiki_filter:E. I. Hatch Nuclear PlantDegraded Grid VoltageLicense Amendment Request HNP Degraded Grid Voltage LAR OverviewDVR -Degraded Voltage Relay -senses voltage on 4 kV Emergency Bus-provides contacts for automatic action LAR -License Amendment Request LOCA -Loss of Coolant Accident -requires group starting of Class 1E equipment MEV -Minimum Expected Voltage on 4 kV bus concurrent with a)steady-state LOCA loading, and b)offsite supply at minimum normal voltage, 101.3% of 230 kVMRV -Minimum Required Voltage on 4 kV bus; is the greater ofa)Min voltage for non-accident operation of Class 1E loads, b)Min pre-start voltage for LOCA group motor starting c)Min start/run voltage for individual motors under max accident loading SAT -Startup Auxiliary Transformer -supplies 4 kV buses from 230kV grid Definitions HNP Degraded Grid Voltage LAR Overview*Eliminate use of manual actions for degraded voltage protection*LAR Submission: Targeting February 28, 2017 | | {{#Wiki_filter:E. I. Hatch Nuclear Plant Degraded Grid Voltage License Amendment Request |
| *The LAR will contain the following: | | |
| Detailed Description 3.0Technical Evaluation 4.0Regulatory Evaluation 4.1 Significant Hazards Consideration 4.2Applicable Regulatory Requirements/Criteria 4.3Precedent 4.4Conclusion5.0Environmental Consideration 6.0References Purpose of LAR and Submittal Date HNP Degraded Grid Voltage LAR Overview Physical Change Highlights*Replace existing SATs and add a 3 rdSAT per unit*Expand 4 kV cable bus system and realign loads among the 3 SATs*Replace 4 kV breakers and upgrade bus bar supports | | HNP Degraded Grid Voltage LAR Overview Definitions DVR - Degraded Voltage Relay - senses voltage on 4 kV Emergency Bus |
| *Replace induction disc DVRs with new solid-state DVRs (3 per bus) | | - provides contacts for automatic action LAR - License Amendment Request LOCA - Loss of Coolant Accident - requires group starting of Class 1E equipment MEV - Minimum Expected Voltage on 4 kV bus concurrent with a) steady-state LOCA loading, and b) offsite supply at minimum normal voltage, 101.3% of 230 kV MRV - Minimum Required Voltage on 4 kV bus; is the greater of a) Min voltage for non-accident operation of Class 1E loads, b) Min pre-start voltage for LOCA group motor starting c) Min start/run voltage for individual motors under max accident loading SAT - Startup Auxiliary Transformer - supplies 4 kV buses from 230kV grid |
| HNP Degraded Grid Voltage LAR OverviewTechnical Specification Change Highlights*TS 3.8.1 -Change required OPERABLE offsite circuits from 2 to 3*TS 3.3.8.1 -Increase DVR actuation voltage, specified for each bus*TS 3.3.8.1 -Decrease DVR actuation delay time | | |
| *TS 3.3.8.1 -Return alarm relay function to non-Tech Spec status Methodology for Relay Setpoints(Voltage and Time Delay)*Degraded Voltage Relays (DVRs) shall be set such that offsite power will be automatically disconnected and transferred to onsite power during an extended degraded grid condition (any voltage dip having a longer duration than expected for normal or accident operations). *The DVRs on each Class 1E 4KV bus will be set so that, including tolerances, voltage dropout valuewill be above the MRV value.*The DVR voltage reset value, including tolerances, will be set below the MEV. | | HNP Degraded Grid Voltage LAR Overview Purpose of LAR and Submittal Date |
| HNP Degraded Grid Voltage LARElectrical system lineup after mods are implementedExisting Electrical Lineup Revised Electrical LineupBusNormal Supply Alternate Supply Normal Supply Alternate Supply 1ESAT 1DSAT 1CSAT 1ESAT 1D 1FSAT 1DSAT 1CSAT 1CSAT 1E 1GSAT 1DSAT 1CSAT 1DSAT 1C2ESAT 2DSAT 2CSAT 2ESAT 2D2FSAT 2DSAT 2CSAT 2CSAT 2E 2GSAT 2DSAT 2CSAT 2DSAT 2C HNP Degraded Grid Voltage LARLow-Voltage Switchyard Layout Showing Unit 2 SATs,Added SATs & Upgraded / Added 4 kV Cable BusesReplacementU2 SATsAdded U1 & U2 SATs ReplacementU1 SATs HNP Degraded Grid Voltage LAR Bus 1E is shown; other buses are similar Limiting Values Diagram Future Submittal*Increased RAS times for a single offsite power source out of service*LAR Submission: Targeting June 9, 2017 Hatch Degraded Grid LAR*Questions?}} | | * Eliminate use of manual actions for degraded voltage protection |
| | * LAR Submission: Targeting February 28, 2017 |
| | * The LAR will contain the following: |
| | Detailed Description 3.0 Technical Evaluation 4.0 Regulatory Evaluation 4.1 Significant Hazards Consideration 4.2 Applicable Regulatory Requirements/Criteria 4.3 Precedent 4.4 Conclusion 5.0 Environmental Consideration 6.0 References |
| | |
| | HNP Degraded Grid Voltage LAR Overview Physical Change Highlights |
| | * Replace existing SATs and add a 3rd SAT per unit |
| | * Expand 4 kV cable bus system and realign loads among the 3 SATs |
| | * Replace 4 kV breakers and upgrade bus bar supports |
| | * Replace induction disc DVRs with new solid-state DVRs (3 per bus) |
| | |
| | HNP Degraded Grid Voltage LAR Overview Technical Specification Change Highlights |
| | * TS 3.8.1 - Change required OPERABLE offsite circuits from 2 to 3 |
| | * TS 3.3.8.1 - Increase DVR actuation voltage, specified for each bus |
| | * TS 3.3.8.1 - Decrease DVR actuation delay time |
| | * TS 3.3.8.1 - Return alarm relay function to non-Tech Spec status |
| | |
| | Methodology for Relay Setpoints (Voltage and Time Delay) |
| | * Degraded Voltage Relays (DVRs) shall be set such that offsite power will be automatically disconnected and transferred to onsite power during an extended degraded grid condition (any voltage dip having a longer duration than expected for normal or accident operations). |
| | * The DVRs on each Class 1E 4KV bus will be set so that, including tolerances, voltage dropout value will be above the MRV value. |
| | * The DVR voltage reset value, including tolerances, will be set below the MEV. |
| | |
| | HNP Degraded Grid Voltage LAR Electrical system lineup after mods are implemented Existing Electrical Lineup Revised Electrical Lineup Bus Normal Supply Alternate Supply Normal Supply Alternate Supply 1E SAT 1D SAT 1C SAT 1E SAT 1D 1F SAT 1D SAT 1C SAT 1C SAT 1E 1G SAT 1D SAT 1C SAT 1D SAT 1C 2E SAT 2D SAT 2C SAT 2E SAT 2D 2F SAT 2D SAT 2C SAT 2C SAT 2E 2G SAT 2D SAT 2C SAT 2D SAT 2C |
| | |
| | HNP Degraded Grid Voltage LAR Low-Voltage Switchyard Layout Showing Unit 2 SATs, Added SATs & Upgraded / Added 4 kV Cable Buses Replacement U1 SATs Replacement U2 SATs N |
| | Added U1 & U2 SATs |
| | |
| | HNP Degraded Grid Voltage LAR Limiting Values Diagram Bus 1E is shown; other buses are similar |
| | |
| | Future Submittal |
| | * Increased RAS times for a single offsite power source out of service |
| | * LAR Submission: Targeting June 9, 2017 |
| | |
| | Hatch Degraded Grid LAR |
| | * Questions?}} |
Letter Sequence Meeting |
|---|
|
|
MONTHYEARML17009A3832017-01-0909 January 2017
Degraded Voltage Pre-Submittal Public Meeting Slides
Project stage: Meeting
ML17030A4372017-02-15015 February 2017
Summary of Public Meeting with Southern Nuclear Operating Company, Inc. to Discuss the Degraded Grid Voltage Proposed License Amendment Request
Project stage: Meeting
2017-01-09
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[Table view] |
Text
E. I. Hatch Nuclear Plant Degraded Grid Voltage License Amendment Request
HNP Degraded Grid Voltage LAR Overview Definitions DVR - Degraded Voltage Relay - senses voltage on 4 kV Emergency Bus
- provides contacts for automatic action LAR - License Amendment Request LOCA - Loss of Coolant Accident - requires group starting of Class 1E equipment MEV - Minimum Expected Voltage on 4 kV bus concurrent with a) steady-state LOCA loading, and b) offsite supply at minimum normal voltage, 101.3% of 230 kV MRV - Minimum Required Voltage on 4 kV bus; is the greater of a) Min voltage for non-accident operation of Class 1E loads, b) Min pre-start voltage for LOCA group motor starting c) Min start/run voltage for individual motors under max accident loading SAT - Startup Auxiliary Transformer - supplies 4 kV buses from 230kV grid
HNP Degraded Grid Voltage LAR Overview Purpose of LAR and Submittal Date
- Eliminate use of manual actions for degraded voltage protection
- LAR Submission: Targeting February 28, 2017
- The LAR will contain the following:
Detailed Description 3.0 Technical Evaluation 4.0 Regulatory Evaluation 4.1 Significant Hazards Consideration 4.2 Applicable Regulatory Requirements/Criteria 4.3 Precedent 4.4 Conclusion 5.0 Environmental Consideration 6.0 References
HNP Degraded Grid Voltage LAR Overview Physical Change Highlights
- Replace existing SATs and add a 3rd SAT per unit
- Expand 4 kV cable bus system and realign loads among the 3 SATs
- Replace 4 kV breakers and upgrade bus bar supports
- Replace induction disc DVRs with new solid-state DVRs (3 per bus)
HNP Degraded Grid Voltage LAR Overview Technical Specification Change Highlights
- TS 3.3.8.1 - Increase DVR actuation voltage, specified for each bus
- TS 3.3.8.1 - Return alarm relay function to non-Tech Spec status
Methodology for Relay Setpoints (Voltage and Time Delay)
- Degraded Voltage Relays (DVRs) shall be set such that offsite power will be automatically disconnected and transferred to onsite power during an extended degraded grid condition (any voltage dip having a longer duration than expected for normal or accident operations).
- The DVRs on each Class 1E 4KV bus will be set so that, including tolerances, voltage dropout value will be above the MRV value.
- The DVR voltage reset value, including tolerances, will be set below the MEV.
HNP Degraded Grid Voltage LAR Electrical system lineup after mods are implemented Existing Electrical Lineup Revised Electrical Lineup Bus Normal Supply Alternate Supply Normal Supply Alternate Supply 1E SAT 1D SAT 1C SAT 1E SAT 1D 1F SAT 1D SAT 1C SAT 1C SAT 1E 1G SAT 1D SAT 1C SAT 1D SAT 1C 2E SAT 2D SAT 2C SAT 2E SAT 2D 2F SAT 2D SAT 2C SAT 2C SAT 2E 2G SAT 2D SAT 2C SAT 2D SAT 2C
HNP Degraded Grid Voltage LAR Low-Voltage Switchyard Layout Showing Unit 2 SATs, Added SATs & Upgraded / Added 4 kV Cable Buses Replacement U1 SATs Replacement U2 SATs N
Added U1 & U2 SATs
HNP Degraded Grid Voltage LAR Limiting Values Diagram Bus 1E is shown; other buses are similar
Future Submittal
- Increased RAS times for a single offsite power source out of service
- LAR Submission: Targeting June 9, 2017
Hatch Degraded Grid LAR
