ENS 55427

v t e ENS Event
18:06 Aug 24, 2021
Title	Appendix R Hot Short Unanalyzed Condition
Event Description	During an extent of condition review of DC control circuits, it was identified there are additional unprotected DC control circuits which are routed between separate Appendix R fire areas. A postulated fire in one area can cause a short circuit and potentially result in secondary fires or cable fires in other fire areas where the cables are routed. The secondary fires or cable failures degrade the degree of separation for redundant safe shutdown trains and are outside the assumptions of the 10 CFR 50 Appendix R Safe Shutdown Analysis. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B). Compensatory actions for affected fire areas have been implemented. Design modifications in the affected control circuits are being developed and will be scheduled to correct this condition.

ENS 55427 +/-
Where
FitzPatrick New York (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
LER:	05000333/LER-2021-001 Inadequate Protection Devices for DC Motor Field Shunt Cables Through Separate Fire Areas 05000333/LER-2021-001-01 Inadequate Protection Devices for DC Motor Field Shunt Cables Through Separate Fire Areas
Time - Person (Reporting Time:+-1.25 h-0.0521 days <br />-0.00744 weeks <br />-0.00171 months <br />)
Opened:	Andrew Weaver 16:51 Aug 24, 2021
NRC Officer:	Brian P. Smith
Last Updated:	Aug 24, 2021
55427 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
FitzPatrick with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2021-08-24T18:06:00 [Table view]
[ENS list for FitzPatrick]

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