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An automatic reactor trip occurred on high … An automatic reactor trip occurred on high Reactor Coolant System pressure due to rapid closure of the Turbine Generator governor valves. � All control rods fully inserted and no Engineered Safety Features actuations occurred. � The root cause was determined to be failure of a chip in the reference up-down counter card in the Electro-Hydraulic Control (EHC) System. � Another card in the IHC System was also found to have failed. � A common failure mode could not be identified. � The unit returned to power operation after the cards were replaced.</br></br>� An EHC reliability study is being conducted to determine the need for system upgrades and improved maintenance strategies. � This event had minimal safety significance. � There have been no previous similar events reported by Arkansas Nuclear One as Licensee Event Reports.</br></br>NRC FORM-3SFA 0-2o3s) U.S. NUCLEAR REGULATORY COMMISSION FACLITY NAME (1) DocxErp) LERNUMBER is PAGE (3) Arkansas Nuclear One Unit 1 05000313 I(3) Arkansas Nuclear One Unit 1 05000313 I +
July 24, 2001 +
An automatic reactor trip occurred on high … An automatic reactor trip occurred on high Reactor Coolant System pressure due to rapid closure of the Turbine Generator governor valves. � All control rods fully inserted and no Engineered Safety Features actuations occurred. � The root cause was determined to be failure of a chip in the reference up-down counter card in the Electro-Hydraulic Control (EHC) System. � Another card in the IHC System was also found to have failed. � A common failure mode could not be identified. � The unit returned to power operation after the cards were replaced.</br></br>� An EHC reliability study is being conducted to determine the need for system upgrades and improved maintenance strategies. � This event had minimal safety significance. � There have been no previous similar events reported by Arkansas Nuclear One as Licensee Event Reports.</br></br>NRC FORM-3SFA 0-2o3s) U.S. NUCLEAR REGULATORY COMMISSION FACLITY NAME (1) DocxErp) LERNUMBER is PAGE (3) Arkansas Nuclear One Unit 1 05000313 I(3) Arkansas Nuclear One Unit 1 05000313 I +
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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>.
15:07:12, 27 November 2017 +
September 20, 2001 +
July 24, 2001 +
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