Browse wiki
Jump to navigation
Jump to search
The following information was provided by … The following information was provided by the licensee via email:</br>On September 7, 2022, Dominion's Surry Power Station notified United Controls International (UCI) that three Schneider Electric PIN: ASP840-000 Modicon Primary/Secondary Power Supply units that were supplied by UCI in 2014 had failed after installation. Hard failures that shutdown the associated programmable logic controller were observed. The first unit was installed since June 6, 2017, and then failed in August of 2022. The second and third units failed approximately three days after installation. All units appeared to function properly at initial installation.</br>The subject items were returned to UCI on October 19, 2022, for evaluation. Items were received at UCI with substantial shipping damage noted. One item was received with a loose transformer inside the unit. All items were received with bent or cracked cases. These issues are attributed to poor shipping practices as items were not supplied in such conditions and these issues would have been noted at receipt by the utility. Due to the complexity of the items and unavailability of design documentation for these obsolete items, further evaluation of item failures required manufacturer (Schneider Electric) evaluation. UCI returned all three items to the manufacturer for evaluation of failed components. The manufacturer was able to repair one item by replacing several capacitors, transistors, integrated circuits, and resistors; however, a specific cause of the failure could not be identified. The remaining two items were determined to be unrepairable, and cause of failure could not be identified.</br>UCI is not capable of providing any further evaluation as to the root cause of the subject module failures. The item manufacturer Schneider Electric was also unable to provide a determination as to the cause of failure. Since the root cause of failure cannot be determined or inspected for, UCI will no longer be supplying these modules which are now obsolete.</br>North Anna and Surry Power Station are the plants affected.rry Power Station are the plants affected.
04:00:00, 12 April 2023 +
56,469 +
07:53:00, 14 April 2023 +
04:00:00, 12 April 2023 +
The following information was provided by … The following information was provided by the licensee via email:</br>On September 7, 2022, Dominion's Surry Power Station notified United Controls International (UCI) that three Schneider Electric PIN: ASP840-000 Modicon Primary/Secondary Power Supply units that were supplied by UCI in 2014 had failed after installation. Hard failures that shutdown the associated programmable logic controller were observed. The first unit was installed since June 6, 2017, and then failed in August of 2022. The second and third units failed approximately three days after installation. All units appeared to function properly at initial installation.</br>The subject items were returned to UCI on October 19, 2022, for evaluation. Items were received at UCI with substantial shipping damage noted. One item was received with a loose transformer inside the unit. All items were received with bent or cracked cases. These issues are attributed to poor shipping practices as items were not supplied in such conditions and these issues would have been noted at receipt by the utility. Due to the complexity of the items and unavailability of design documentation for these obsolete items, further evaluation of item failures required manufacturer (Schneider Electric) evaluation. UCI returned all three items to the manufacturer for evaluation of failed components. The manufacturer was able to repair one item by replacing several capacitors, transistors, integrated circuits, and resistors; however, a specific cause of the failure could not be identified. The remaining two items were determined to be unrepairable, and cause of failure could not be identified.</br>UCI is not capable of providing any further evaluation as to the root cause of the subject module failures. The item manufacturer Schneider Electric was also unable to provide a determination as to the cause of failure. Since the root cause of failure cannot be determined or inspected for, UCI will no longer be supplying these modules which are now obsolete.</br>North Anna and Surry Power Station are the plants affected.rry Power Station are the plants affected.
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
00:00:00, 14 April 2023 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
11:30:09, 17 April 2023 +
07:53:00, 14 April 2023 +
2.162 d (51.88 hours, 0.309 weeks, 0.0711 months) +
04:00:00, 12 April 2023 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.