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Home NRC Library Document Collections Events, Reports Associated with Event Notification Reports 2025

Event Notification Report for July 28, 2025

U.S. Nuclear Regulatory Commission
Operations Center

EVENT REPORTS FOR
07/25/2025 - 07/28/2025

EVENT NUMBERS
57819 57824 57827
Agreement State
Event Number: 57819
Rep Org: Texas Dept of State Health Services
Licensee: Braskem America Inc.
Region: 4
City: Freeport   State: TX
County:
License #: 06443
Agreement: Y
Docket:
NRC Notified By: Sindiso Ncube
HQ OPS Officer: Tenisha Meadows
Notification Date: 07/19/2025
Notification Time: 15:04 [ET]
Event Date: 07/18/2025
Event Time: 00:00 [CDT]
Last Update Date: 07/19/2025
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Drake, James (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
AGREEMENT STATE REPORT - STUCK OPEN GAUGE SHUTTER

The following information was provided by the Texas Department of Health (the Department) via email:

"On July 19, 2025, the Department was notified by the licensee of a gauge shutter mechanism failure. A Vega gauge model SH-F2, containing a 300 millicurie cesium-137 sealed source, was reported to be stuck in the open position. Open is the normal operating position. The issue was discovered on July 18, 2025, and the licensee confirmed there is no risk of additional radiation exposure to the public or workers due to this on/off mechanism failure.

"Additional information will be provided in accordance with SA-300 reporting requirements."

Texas incident number: 10210
NMED number: TX250035


Non-Power Reactor
Event Number: 57824
Facility: Massachusetts Institute Of Tech (MITE)
RX Type: 6000 Kw Tank Research Hw
Comments:
Region: 0
City: Cambridge   State: MA
County: Middlesex
License #: R-37
Agreement: Y
Docket: 05000020
NRC Notified By: Edward Lau
HQ OPS Officer: Ernest West
Notification Date: 07/24/2025
Notification Time: 15:24 [ET]
Event Date: 07/24/2025
Event Time: 12:00 [EDT]
Last Update Date: 07/24/2025
Emergency Class: Non Emergency
10 CFR Section:
Non-Power Reactor Event
Person (Organization):
Montgomery, Cindy (NRR)
Lin, Brian (NRR)
Event Text
TECHNICAL SPECIFICATION VIOLATION

The following information was provided by the licensee via phone and email:

On July 24, 2025, the licensee reported that it had violated Technical Specification 3.4.1.A. which requires the reactor to be secured when containment is not maintained. The console key switch was inserted while not having containment integrity. Prior to and at the time of the occurrence, the reactor was shutdown for more than two weeks for scheduled outage maintenance activities. Nuclear safety of the reactor was never challenged. This event did not cause the existence or development of an unsafe condition.

The NRC Project Manager was notified.


Part 21
Event Number: 57827
Rep Org: Curtiss Wright Flow Control Co.
Licensee:
Region: 3
City: Cincinnati   State: OH
County:
License #:
Agreement: Y
Docket:
NRC Notified By: Margie Hover
HQ OPS Officer: Kerby Scales
Notification Date: 07/25/2025
Notification Time: 09:47 [ET]
Event Date: 05/21/2025
Event Time: 00:00 [EDT]
Last Update Date: 07/25/2025
Emergency Class: Non Emergency
10 CFR Section:
21.21(a)(2) - Interim Eval Of Deviation
Person (Organization):
Zurawski, Paul (R3DO)
Part 21/50.55 Reactors, - (EMAIL)
Event Text
PART 21 INTERIM REPORT OF DEVIATION

The following is a synopsis of information provided by Curtiss-Wright (CW) via email:

On 5/21/2025, Xcel Energy notified Curtiss-Wright about the failure of two NAMCO limit switches provided under CW project CJ21087 (tag number CJ2108701, serial numbers 01 and 04). The limit switches were dedicated by CW and shipped on 2/28/2025 to Xcel Energy. The switches failed a bench test performed by Xcel Energy, which aimed to verify that the contacts properly revert to their original state during spring return. Xcel Energy found that the contacts reverted to their original state prior to the audible click/snap, which is supposed to indicate contact changeover.

The two units were returned to Curtiss-Wright on 5/29/2025. The test result was fully duplicated on one of the switches. For the other switch (serial number 04), the switch contacts intermittently failed to return to the original state at all, requiring manual assistance to do so.

On 6/26/2025, CW sent the parts to NAMCO for repair. CW retested the parts after the repair. Part 04 still had the same issue with failing to reset as noted earlier. That limit switch was returned to NAMCO for a full evaluation.

CW anticipates an update to this notification with final results on 9/23/2025.

Potentially affected U.S. nuclear power plants: unknown at the time of the notification.

Contact Information:
Mark Papke
Quality Assurance Manager
Curtiss-Wright
4600 East Tech Drive
Cincinnati, OH 45245
mpapke@curtisswright.com