ENS 53005

v t e ENS Event
18:05 Oct 9, 2017
Title	Notification of Unusual Event - Flammable Gas in the Turbine Building
Event Description	While troubleshooting a hydrogen differential pressure gauge, operators found a hydrogen concentration greater than the lower explosive limit (4% hydrogen concentration). The licensee evacuated the turbine building. The licensee is ventilating the area to allow personnel access to isolate and repair the leak. The plant Fire Brigade is on standby. This event was declared for GU-2: release of toxic or flammable gas. The main generator pressure and hydrogen concentration are stable. The licensee notified the NRC Resident Inspector. Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). * * UPDATE AT 1630 EDT ON 10/9/2017 FROM NORMAN KUZEL TO MARK ABRAMOVITZ * * * The unusual event was terminated at 1617 EDT because the leak was isolated and the hydrogen concentration in the Hydrogen Control Cabinet was zero percent. The licensee notified the NRC Resident Inspector. Notified the R1DO (Jackson), IRD MOC (Stapleton), NRR (King), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).

ENS 53005 +/-
Where
Millstone Connecticut (NRC Region 1)
Reporting
Emergency class:	Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration
Time - Person (Reporting Time:+-3.7 h-0.154 days <br />-0.022 weeks <br />-0.00507 months <br />)
Opened:	Norman Kuzel 14:23 Oct 9, 2017
NRC Officer:	Mark Abramovitz
Last Updated:	Oct 9, 2017
53005 - NRC Website
v • d • e

v t e Emergency Notification System
Millstone with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2020-11-08T13:29:00 [Table view]
[ENS list for Millstone]

Navigation menu