ML21293A008: Difference between revisions

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{{#Wiki_filter:Zone of Influence (ZOI)
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* NUREG/CR-6850 Definition (generic): A volume surrounding an ignition source where all intervening combustibles and targets may be adversely affected by a fire initiated by the ignition source.
* NUREG/CR-6850 (HEAF-specific severity factors): High-energy arcing faults are modeled assuming damage to a predefined zone of influence. The severity factor is 1.0 ZOI Illustration (NUREG/CR-6850 Appendix M, Figure M-1) due to the assumption that the fire will propagate and/or damage equipment within the zone of influence.
 
Does Al HEAF Require a Change to Modeled ZOI?
It is a safety concern warranting action It is not a safety concern
* OECD non-prototypic test but no ZOI
* Cables very robust measured                              * ~100,000 of component operating years with Al widespread
* No op ex shows an increased ZOI
* Harris HEAF with Al
* Actual ZOI bounded by currently modeled ZOI
* Cables within ZOI functional
* Robinson within modeled ZOI
* Appendix R separation - change in ZOI would have to be very large}}

Revision as of 19:33, 16 January 2022

HEAF - NEI
ML21293A008
Person / Time
Site: Nuclear Energy Institute
Issue date: 10/20/2021
From:
Nuclear Energy Institute
To: Lingham S
NRC/NRR/DORL/LPL4
Lingham S
Shared Package
ML21293A007, ML21291A179 List:
References
EPID L-2021-NFO-0007
Download: ML21293A008 (2)
v • d • e


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