ENS 58060: Difference between revisions

v t e ENS Event
06:00 Nov 25, 2025
Title	Part 21 - Rosemount Pressure Transmitters Electronic Assembly Faiulres
Event Description	The following is a summary of information provided by the vendor via phone and email: Rosemount Nuclear Instruments, Inc. reported that certain Rosemount model 3154 pressure transmitters have exhibited a higher field return rate as a result of electronics assembly failure caused by an open circuit condition in certain precision wire wound resistors. This notification pertains to certain transmitters or spare electronics assemblies manufactured between November 2015 and November 2022. Specific parts affected are being identified to customers. Rosemount does not have complete information relating to specific plant applications and therefore cannot determine the potential effects of this condition on plant operation. Failure analysis determined the open circuit condition is a result of corrosion of the resistive wire element, which leads to an annunciated off-scale low failure of the 4-20 mA analog output signal. In some cases, the off-scale low failure may be preceded by observable erratic behavior of the analog output and/or analog output drift outside of published specifications. If the analog output is erratic or drifting outside of published specifications, the transmitter output should be considered unreliable. Rosemount investigation has determined the higher failure rate is associated with certain lots of wire wound resistors. As of this notice, 70 percent of model 3154 wire wound resistor failures occurred at two reactor sites, suggesting higher failure rates may be experienced at individual locations. Rosemount has revised the design of all Rosemount 3150-series nuclear qualified pressure transmitters to utilize higher reliability precision resistor technologies. This revision is fully qualified and implemented for all Rosemount 3150 series models including, but not limited to, Rosemount model 3154. Rosemount recommends that users review the application where any of the model 3154 pressure transmitters affected are used to determine any safety consideration in the operation of the plant and report any observed failures. Rosemount model 3154 pressure transmitters within the scope of this notification are considered fully functional unless failure symptoms consistent with the description are identified. Responsible company officer: Gerard Hanson Vice President and General Manager 8200 Market Blvd Chanhassen, MN Affected plants: Region I: Beaver Valley, Calvert Cliffs, Ginna, Hope Creek, Indian Point, Millstone, North Anna, Salem, Seabrook, Surry, VC Summer Region II: Browns Ferry, Catawba, Farley, Harris, Hatch, McGuire, Oconee, Robinson, Sequoyah, St. Lucie, Turkey Point, Vogtle, Watts Bar Region III: Braidwood, Byron, Davis Besse, DC Cook, Dresden, LaSalle, Monticello, Point Beach, Prairie Island, Quad Cities Region IV: ANO, Callaway, Columbia, Commanche Peak, Diablo Canyon, River Bend, South Texas Project, Waterford, Wolf Creek

ENS 58060 +/-
Where
Rosemount Nuclear Instruments, Inc. Chanhassen, Minnesota (NRC Region 3)
Organization:	Rosemount Nuclear Instruments, Inc.
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+9.02 h0.376 days <br />0.0537 weeks <br />0.0124 months <br />)
Opened:	Michelle Mcdonald 15:01 Nov 25, 2025
NRC Officer:	Robert A. Thompson
Last Updated:	Nov 25, 2025
58060 - NRC Website
v • d • e

v t e Emergency Notification System
Rosemount Nuclear Instruments, Inc. with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2025-11-25T06:00:00 [Table view]
[ENS list for Rosemount Nuclear Instruments, Inc.]

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 Region III:  Braidwood, Byron, Davis Besse, DC Cook, Dresden, LaSalle, Monticello, Point Beach, Prairie Island, Quad Cities
 Region IV:  ANO, Callaway, Columbia, Commanche Peak, Diablo Canyon, River Bend, South Texas Project, Waterford, Wolf Creek
-| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251126en.html#en58060
+| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251128en.html#en58060
 }}
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ENS 58060: Difference between revisions

Latest revision as of 07:20, 28 November 2025

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ENS 58060: Difference between revisions

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