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At 1627 CST on December 16, 2013 Farley Nu … At 1627 CST on December 16, 2013 Farley Nuclear Plant determined that the following was an unanalyzed condition:</br>As a result of recent industry operating experience (OE 305419, EN 49411, EN 49419) regarding the impact of un-fused Direct Current (DC) ammeter circuits in the Control Room, Farley performed a review of ammeter circuitry for similar issues. The review determined the described condition to be applicable to Farley resulting in an unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements. The wiring design for the ammeters contains a shunt in the current flow from each DC battery and battery charger, but the ammeter wiring attached to the shunt does not contain fuses.</br>It is postulated that a fire could cause one of the ammeter wires to short to ground. Concurrently, the fire causes another DC wire from the opposite polarity on the same battery to also short to ground. This would cause a ground loop through the un-fused ammeter cable. The potential exists that the cable could heat up, causing a secondary fire in the ammeter raceway. The secondary fire could adversely affect safe shutdown equipment and potentially cause the loss of the ability to safely shutdown per 10 CFR 50 Appendix R.</br>This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Compensatory measures have been implemented for affected areas of the plant.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
22:27:00, 16 December 2013 +
49,638 +
21:37:00, 16 December 2013 +
22:27:00, 16 December 2013 +
At 1627 CST on December 16, 2013 Farley Nu … At 1627 CST on December 16, 2013 Farley Nuclear Plant determined that the following was an unanalyzed condition:</br>As a result of recent industry operating experience (OE 305419, EN 49411, EN 49419) regarding the impact of un-fused Direct Current (DC) ammeter circuits in the Control Room, Farley performed a review of ammeter circuitry for similar issues. The review determined the described condition to be applicable to Farley resulting in an unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements. The wiring design for the ammeters contains a shunt in the current flow from each DC battery and battery charger, but the ammeter wiring attached to the shunt does not contain fuses.</br>It is postulated that a fire could cause one of the ammeter wires to short to ground. Concurrently, the fire causes another DC wire from the opposite polarity on the same battery to also short to ground. This would cause a ground loop through the un-fused ammeter cable. The potential exists that the cable could heat up, causing a secondary fire in the ammeter raceway. The secondary fire could adversely affect safe shutdown equipment and potentially cause the loss of the ability to safely shutdown per 10 CFR 50 Appendix R.</br>This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Compensatory measures have been implemented for affected areas of the plant.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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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>.
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