ENS 41816

v t e ENS Event
23:31 Jun 30, 2005
Title	Unanalyzed Condition Related to the Standby Feedwater Pumps and Control Circuits
Event Description	During an NRC Triennial Fire Protection Audit the Inspector identified a fuse coordination issue between 130VDC supply circuit and breaker trip circuit fuses for the Standby Feedwater (SBFW) Pump switchgear. The coordination ratio was found to be too low to support requirements for fire related safe shutdown equipment under Generic Letter 81-12. Impacted equipment is SBFW Pumps A & B and control circuits required for Appendix R Alternative Shutdown auxiliary equipment. This event is being reported as an unanalyzed condition that significantly degraded plant safety under 10CFR50.72(b)(3)(ii)(B). The impacted equipment has been declared inoperable and a team is currently working on design changes to change fuse sizes for the breaker trip circuit/supply circuit to meet the requirements of Generic Letter 81-12. The licensee notified the NRC Resident Inspector.

ENS 41816 +/-
Where
Fermi Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
LER:	05000341/LER-2005-005
Time - Person (Reporting Time:+0.62 h0.0258 days <br />0.00369 weeks <br />8.49276e-4 months <br />)
Opened:	Patrick Fallon 00:08 Jul 1, 2005
NRC Officer:	Arlon Costa
Last Updated:	Jul 1, 2005
41816 - NRC Website
v • d • e

v t e Emergency Notification System
Fermi with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2021-05-03T13:30:00 [Table view]
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