ENS 58107

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v t e ENS Event
05:00 Dec 13, 2025
Title	Lost Source
Event Description	The following information was provided by the licensee via phone and email: The US Navy master materials licensee reports a loss of 500 microcuries of Sr-90 in an inflight blade inspection system (IBIS), model number 12210-1, serial number 2136. During flight, a CH-53E [helicopter made] a precautionary emergency landing. [Upon landing] visible damage to one main rotor blade [and] three tail rotor blades [was observed,] resulting in the missing IBIS. The incident occurred on December 13, 2025, but a search was delayed due to a snowstorm and ice. After a visual and survey instrument search, the IBIS [was] declared lost on January 5, 2026. [The incident] occurred in a low-population area [in the vicinity of] Manchester Township, New Jersey. THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

ENS 58107 +/-
Where
U.S. Navy Manchester Township, New Jersey (NRC Region 1)
License number:	45-23645-01NA
Organization:	U.S. Navy
Reporting

10 CFR 20.2201(a)(1)(i)
Time - Person (Reporting Time:+583.98 h24.333 days <br />3.476 weeks <br />0.8 months <br />)
Opened:	Kevin Huhn 12:59 Jan 6, 2026
NRC Officer:	Ernest West
Last Updated:	Jan 6, 2026
58107 - NRC Website
v • d • e

v t e Emergency Notification System
U.S. Navy with 10 CFR 20.2201(a)(1)(i)
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