ML20338A254

HEAF Involving Aluminium Components - Presentation

ML20338A254
Person / Time
Issue date:	12/14/2020
From:	NRC/NRR/DRA
To:
Alexander Schwab
References
Download: ML20338A254 (3)

Text

High Energy Arcing Faults Involving Aluminum Components RISC Meeting December 2, 2020

Proposed Path to Resolution of Pre GI-0018 on HEAF

• NRC staff developing approach to resolve the pre generic issue on HEAF involving aluminum without additional NRC sponsored testing

• Approach will build off NRC/EPRI Working Group project plan, including the EPRI survey, to determine the extent of aluminum in plants and plant-specific electrical configurations

• Initial steps will include filling in gaps identified in the survey (details on the following slide)

• Using insights from gap analysis, NRC staff will determine the next steps

• Anticipate public meeting no later than the next quarter of FY21

Proposed Path to Resolution of Pre GI-0018 on HEAF NRC/EPRI HEAF working group will fill the survey gaps as follows:

• Compile Draft Hazard Tables to estimate the Zone of Influences using currently available data (e.g., expert elicitation, completed testing, OpE, modeling)

• Compile representative PRA methods ensuring that representative models (e.g., equipment categories, plant specific electrical and switchgear configurations) are available for the configurations documented in the EPRI survey

• Bin plants of interest for potential further evaluation crediting EPRI best-practice procedures, FLEX equipment, etc. as appropriate

- Analysis will take into account backfit considerations.

• Review licensees practices to prevent an Al HEAF event and fire response mitigation of an Al HEAF