ML19183A308: Difference between revisions
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{{#Wiki_filter: | {{#Wiki_filter:High Energy Arcing Faults (HEAF) Test Program Comment Resolution Nicholas Melly Kenneth Hamburger Gabriel Taylor P.E. | ||
Mark Henry Salley P.E. | |||
-July | Office of Nuclear Regulatory Research Division of Risk Analysis July 9, 2019 Public Meeting - July 24th, 2019 | ||
-Initial comment period | |||
-April 2018 workshop | Objective | ||
-January 2019 public meeting | * Update stakeholders on the disposition of outstanding comments | ||
-March 2019 public meeting | - Initial comment period | ||
-Other stakeholder | - April 2018 workshop | ||
-July | - January 2019 public meeting | ||
-Operating Experience | - March 2019 public meeting | ||
*Operating experience has identified multiple cases where prolonged duration events have occurred in both US and International OE -Medium Voltage prolonged duration events are consistent with generator-fed fault conditions and protection failure events | - Other stakeholder interactions Public Meeting - July 24th, 2019 | ||
-Low Voltage prolonged duration is plausible at currents which potentially fall between circuit protection set | |||
-July | Stakeholder Comments Test Duration | ||
-Working Group activities | * Is an 8-second test realistic? | ||
*More realistic modeling | - Operating Experience | ||
-Modeling will NOT be one size fits all as currently in NUREG/CR-6850 EPRI 1011989 | * Operating experience has identified multiple cases where prolonged duration events have occurred in both US and International OE | ||
*NRC/EPRI WG event tree/plant configuration and protection scheme taken into account | - Medium Voltage prolonged duration events are consistent with generator-fed fault conditions and protection failure events | ||
*Low Voltage tests will be performed at 8 seconds under the acknowledgement that the results will only be applicable to specific configurations | - Low Voltage prolonged duration is plausible at currents which potentially fall between circuit protection set points Public Meeting - July 24th, 2019 | ||
-The data from the low voltage tests will be investigated by the working group for the potential to inform medium voltage extended duration events beyond the test lab capability Public Meeting | |||
-July | Stakeholder Comments Test Duration (cont.) | ||
*OE on medium voltage switchgear HEAF events:-Majority of the medium voltage switchgear events occurred in the supply switchgear configuration | - Working Group activities | ||
-Majority of the faults occurred at the supply breaker stabs and main bus bars Public Meeting | * More realistic modeling | ||
-July | - Modeling will NOT be one size fits all as currently in NUREG/CR-6850 EPRI 1011989 | ||
- | * NRC/EPRI WG event tree/plant configuration and protection scheme taken into account | ||
-Potentially handled with split fraction in | * Low Voltage tests will be performed at 8 seconds under the acknowledgement that the results will only be applicable to specific configurations | ||
-July | - The data from the low voltage tests will be investigated by the working group for the potential to inform medium voltage extended duration events beyond the test lab capability Public Meeting - July 24th, 2019 | ||
-All low voltage events occurred in the load center supply cubicle | |||
-All faults initiated at the supply breaker stabs*NRC has modified equipment from the initial test plan to include the supply | Stakeholder Comments Fault Location Main bus bar arc wire (blue) | ||
-July | * OE on medium voltage switchgear HEAF events: | ||
-Generator decay curve to more closely simulate generator | - Majority of the medium voltage switchgear events occurred in the supply switchgear configuration | ||
-fed fault-Supply configuration switchgear test | - Majority of the faults occurred at the supply breaker stabs and main bus bars Breaker Stabs Arc Wire Public Meeting - July 24th, 2019 | ||
*NRC plans to conduct both supplementary tests in Spring 2020 | |||
-July | Stakeholder Comments Fault Location | ||
*Afternoon meeting will address: | * Working Group Discussion | ||
-Modeling approach | - Supplementary test on the main bus bars in supply configuration to be conducted in 2020 | ||
-Data needs, inputs, and outputs | - Data from Phase I testing on the breaker stabs is being compiled for use in evaluating the impact of faults on the breaker | ||
-Validation and | - Potentially handled with split fraction in ZOI Public Meeting - July 24th, 2019 | ||
-July | |||
-Working group consensus to evaluate the modification of the test plan to use a mock switchgear | Stakeholder Comments Load Center Design | ||
-EPRI provided support under the MOU to help specify the necessary design of the mock switchgear | * OE on low voltage HEAF events: | ||
-Currently, no procurement contracts in place for the mock switchgear | - All low voltage events occurred in the load center supply cubicle | ||
-July | - All faults initiated at the supply breaker stabs | ||
-GI-018?-Direct comparisons in test matrix design | * NRC has modified equipment from the initial test plan to include the supply cubicles Public Meeting - July 24th, 2019 | ||
-Use of modeling | |||
-Small-scale testing to identify properties of aluminum-Verify scalability of small | Stakeholder Comments Supplementary Tests | ||
-scale | * Stakeholders have requested two types of supplementary tests: | ||
-July | - Generator decay curve to more closely simulate generator-fed fault | ||
- Supply configuration switchgear test | |||
* NRC plans to conduct both supplementary tests in Spring 2020 Public Meeting - July 24th, 2019 | |||
Stakeholder Comments Modeling | |||
* The use of modeling to extend the applicable range of test data is being considered by the Working Group. | |||
* Afternoon meeting will address: | |||
- Modeling approach | |||
- Data needs, inputs, and outputs | |||
- Validation and verification Public Meeting - July 24th, 2019 | |||
Stakeholder Comments Combustion Cloud Conductivity | |||
* Working group has not completely resolved this issue | |||
- Exploring several types of measurements (discussed in more detail in next presentation) | |||
- Working group consensus to evaluate the modification of the test plan to use a mock switchgear | |||
- EPRI provided support under the MOU to help specify the necessary design of the mock switchgear | |||
- Currently, no procurement contracts in place for the mock switchgear Public Meeting - July 24th, 2019 | |||
Stakeholder Comments Isolating the Impact AL | |||
* How is the impact of aluminum being isolated in testing to resolve PRE-GI-018? | |||
- Direct comparisons in test matrix design | |||
- Use of modeling | |||
- Small-scale testing to identify properties of aluminum | |||
- Verify scalability of small-scale results Public Meeting - July 24th, 2019 | |||
Stakeholder/WG Interaction | |||
* External and public stakeholders have requested a way to be apprised of Working Group progress and project status | |||
* The Working Group will be developing a master Project Plan to be posted publicly on the NRC website Public Meeting - July 24th, 2019}} | |||
Latest revision as of 17:10, 19 October 2019
| ML19183A308 | |
| Person / Time | |
|---|---|
| Issue date: | 07/09/2019 |
| From: | Office of Nuclear Regulatory Research |
| To: | |
| K. Hamburger 415-2022 | |
| Shared Package | |
| ML19183A307 | List: |
| References | |
| Download: ML19183A308 (12) | |
Text
High Energy Arcing Faults (HEAF) Test Program Comment Resolution Nicholas Melly Kenneth Hamburger Gabriel Taylor P.E.
Mark Henry Salley P.E.
Office of Nuclear Regulatory Research Division of Risk Analysis July 9, 2019 Public Meeting - July 24th, 2019
Objective
- Update stakeholders on the disposition of outstanding comments
- Initial comment period
- April 2018 workshop
- January 2019 public meeting
- March 2019 public meeting
- Other stakeholder interactions Public Meeting - July 24th, 2019
Stakeholder Comments Test Duration
- Is an 8-second test realistic?
- Operating Experience
- Operating experience has identified multiple cases where prolonged duration events have occurred in both US and International OE
- Medium Voltage prolonged duration events are consistent with generator-fed fault conditions and protection failure events
- Low Voltage prolonged duration is plausible at currents which potentially fall between circuit protection set points Public Meeting - July 24th, 2019
Stakeholder Comments Test Duration (cont.)
- Working Group activities
- More realistic modeling
- Modeling will NOT be one size fits all as currently in NUREG/CR-6850 EPRI 1011989
- NRC/EPRI WG event tree/plant configuration and protection scheme taken into account
- Low Voltage tests will be performed at 8 seconds under the acknowledgement that the results will only be applicable to specific configurations
- The data from the low voltage tests will be investigated by the working group for the potential to inform medium voltage extended duration events beyond the test lab capability Public Meeting - July 24th, 2019
Stakeholder Comments Fault Location Main bus bar arc wire (blue)
- Majority of the medium voltage switchgear events occurred in the supply switchgear configuration
- Majority of the faults occurred at the supply breaker stabs and main bus bars Breaker Stabs Arc Wire Public Meeting - July 24th, 2019
Stakeholder Comments Fault Location
- Working Group Discussion
- Supplementary test on the main bus bars in supply configuration to be conducted in 2020
- Data from Phase I testing on the breaker stabs is being compiled for use in evaluating the impact of faults on the breaker
- Potentially handled with split fraction in ZOI Public Meeting - July 24th, 2019
Stakeholder Comments Load Center Design
- All low voltage events occurred in the load center supply cubicle
- All faults initiated at the supply breaker stabs
- NRC has modified equipment from the initial test plan to include the supply cubicles Public Meeting - July 24th, 2019
Stakeholder Comments Supplementary Tests
- Stakeholders have requested two types of supplementary tests:
- Generator decay curve to more closely simulate generator-fed fault
- Supply configuration switchgear test
- NRC plans to conduct both supplementary tests in Spring 2020 Public Meeting - July 24th, 2019
Stakeholder Comments Modeling
- The use of modeling to extend the applicable range of test data is being considered by the Working Group.
- Afternoon meeting will address:
- Modeling approach
- Data needs, inputs, and outputs
- Validation and verification Public Meeting - July 24th, 2019
Stakeholder Comments Combustion Cloud Conductivity
- Working group has not completely resolved this issue
- Exploring several types of measurements (discussed in more detail in next presentation)
- Working group consensus to evaluate the modification of the test plan to use a mock switchgear
- EPRI provided support under the MOU to help specify the necessary design of the mock switchgear
- Currently, no procurement contracts in place for the mock switchgear Public Meeting - July 24th, 2019
Stakeholder Comments Isolating the Impact AL
- How is the impact of aluminum being isolated in testing to resolve PRE-GI-018?
- Direct comparisons in test matrix design
- Use of modeling
- Small-scale testing to identify properties of aluminum
- Verify scalability of small-scale results Public Meeting - July 24th, 2019
Stakeholder/WG Interaction
- External and public stakeholders have requested a way to be apprised of Working Group progress and project status
- The Working Group will be developing a master Project Plan to be posted publicly on the NRC website Public Meeting - July 24th, 2019