ENS 57027

v t e ENS Event
19:20 Mar 12, 2024
Title	Missing Shutter
Event Description	The following information was received by the Minnesota Department of Health (MDH) via email: On March 12, 2024, at 1539 CDT, the licensee contacted MDH to report a gauge with a missing shutter. During their routine semiannual inventory and shutter check, the licensee discovered a Texas Nuclear model 5190 fixed gauge that was missing its shutter. The gauge contained a 100 mCi Cs-137 source (decayed to 35 mCi). The gauge was equipped with a removable shutter, and the licensee assumes that it had become loose and detached from the device due to normal operating vibration. The event was discovered at approximately 1420 on March 12, 2024. The licensee stated that they had a spare shutter and were able to install it on the gauge. The gauge was installed and operating when the missing shutter was discovered. Therefore, no abnormal radiation field or exposure occurred due to the missing shutter. At the time of the call, the licensee had not yet located the missing shutter. This gauge is used for density measurements on their tailings clarifier underflow pump. Minnesota State Event Report Number: MN240002

ENS 57027 +/-
Where
Northshore Mining Company Silver Bay, Minnesota (NRC Region 3)
License number:	1080
Organization:	Minnesota Department Of Health
Reporting

Agreement State
Time - Person (Reporting Time:+15.37 h0.64 days <br />0.0915 weeks <br />0.0211 months <br />)
Opened:	Tyler Kruse 10:42 Mar 13, 2024
NRC Officer:	Kerby Scales
Last Updated:	Mar 13, 2024
57027 - NRC Website
v • d • e

v t e Emergency Notification System
Northshore Mining Company with Agreement State
WEEKMONTHYEAR2024-03-12T19:20:00 [Table view]
[ENS list for Northshore Mining Company]

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