ENS 46449

v t e ENS Event
06:00 Nov 22, 2010
Title	Anolmaly Discovered on Rosemount Model 1152 Differential Pressure Transmitters with Output Code "L" 10-50 Ma Electronics
Event Description	The following was received via fax: Rosemount Nuclear discovered an anomaly in Model 1152 differential pressure transmitters while troubleshooting a separate, unrelated issue. The anomaly is related to the pressure transmitters response during a overpressure condition. Normally, under a low side overpressure condition, the output will go off-scale and remain off scale for conditions less than 10 mA. Rosemount has discovered that some detectors may go off-scale and then return to on-scale between 10mA and 50 mA, rather than remain off scale under 10mA. This is caused by a change made to operational amplifier components in March 2001. Rosemount recommends all customers evaluate the safety impact of this anomaly on their plants. No field failures have been reported to date. The following sites are affected: Browns Ferry, Brunswick, Cook, Dresden, Duane Arnold, Fermi, Fort Calhoun, Ginna, Hatch, Indian Point, Kewaunee, Millstone, Nine Mile Point, Oyster Creek, Palisades, Pilgrim, Quad Cities, Sequoyah, Vermont Yankee, and Watts Bar.

ENS 46449 +/-
Where
Rosemount Nuclear Chanhassen, Minnesota (NRC Region 3)
Organization:	Rosemount Nuclear
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+254.25 h10.594 days <br />1.513 weeks <br />0.348 months <br />)
Opened:	Marc Bumgarner 20:15 Dec 2, 2010
NRC Officer:	Joe O'Hara
Last Updated:	Dec 2, 2010
46449 - NRC Website
v • d • e

v t e Emergency Notification System
Rosemount Nuclear with 10 CFR 21.21
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