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| Entered date | Event description | |
|---|---|---|
| ENS 55551 | 28 October 2021 17:14:00 | The following is a synopsis of information received via facsimile: On June 18, 2021, STP Nuclear Operating Company returned a York TCM-1A temperature control module with the reported issue that the module would not respond in auto or manual vane control and that internal relays 1R and 2R would not pick up. The subject temperature control module was previously returned by STP Nuclear Operating Company to United Controls International (UCI) for refurbishment and modification, after which it was returned by UCI to STP Nuclear Operating Company on March 13, 2017. Troubleshooting performed by UCI identified that the secondary of the Basler Electric BE13410001 transformer that is used to isolate and step down the input voltage from 115V AC to 22V AC had an open circuit. When the subject transformer was bypassed, the module operated as designed. UCI is unable to determine the cause of the transformer failure. Post refurbishment/modification testing performed by UCI included verifying functionality of the unit before and after performance of a 48 hr. burn-in period. The only facility that is listed as being affected is STP Nuclear Operating Company. If you have any questions or wish to discuss this matter or this report, please contact: Wesley Hickle, Engineering Manager, whickle@unitedcontrols.com, 470-610-0870. |
| ENS 54758 | 29 June 2020 12:04:00 | The following is a summary of information received from United Controls International: On May 1, 2020, Peach Bottom Atomic Power Station notified United Controls International (UCI) that a printed circuit board (PCB) in a station battery charger was shorting to ground. UCI has determined that an energized trace was too close to the mounting screw/washer causing the short. The trace was too close because the mounting holes were modified at the time of installation prior to commercial grade dedication. The modification was not documented. However, this modification was made to subsequent Time Delay Oscillator PCBs. UCI has determined that in this application the energized trace is not used and can be removed from the board without affecting the function. The subject boards should be returned to UCI for this additional modification. UCI will remove the trace and inspect to ensure sufficient clearance exists. The component is used in ABB/Thomas & Betts/Cyberex P/N: 93-41-119385. The subject board was supplied to Peach Bottom Generating Station in May, 2009. CONTACT: Wesley Hickle Engineering Manager whickle@unitedcontrols.com 770-496-1406 x 165 |
| ENS 54476 | 14 January 2020 10:37:00 | On December 27, 2019, United Controls International received a Product Advisory Letter from Ashcroft Inc. dated December 2, 2019 informing of a potential error in the tip material used on Ashcroft 2 « inch and 3 « inch model 1009, 63 mm model 2008, 63 mm and 100 mm model 1008 industrial gauges along with Weksler 3 « inch regal gauges. Due to a supplier issue, 304SS tip material may have been supplied on the subject gauges instead of the specified 316SS material. In certain applications the 304SS tip material may be subject to accelerated oxidation or degradation, resulting in potential release of process media. However, no detrimental effects are expected in non-corrosive applications. Hatch and Farley have been identified as the affected plants and have been notified of this issue. Please contact Wesley Hickle, Engineering Manager, at (770) 496-1406 ext. 165 or whickle@unitedcontrols.com for any questions. |
| ENS 51574 | 1 December 2015 14:53:00 | The following information is a synopsis of information received via E-mail: During refurbishment of General Electric AK-25 type circuit breakers (P/N's: AK-2A-25-1, AK-3A-25-1, and AK-7A-25-1) by United Controls International (UCI), non-current carrying/non-copper based components of the upper stud assembly were silver plated. Bubbling of the silver plating was later noted which is an indication that the plating material was not adhering to the base metal. Flaking of the silver plating material may occur and may introduce conductive foreign material into the host circuit breaker. Introduction of this conductive material could create the possibility of a short circuit of the current sensor terminal board for circuit breakers configured with RMS-9 trip units and subsequent failure of the circuit breaker. Fort Calhoun Nuclear Station is the only known recipient of affected breakers. Fort Calhoun received 18 breakers that contained improperly silver plated components. 14 of these 18 circuit breakers have been returned to UCI. Four of the 18 circuit breakers have been installed at Fort Calhoun and UCI is currently awaiting the return of these four circuit breakers. |