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At 1737 CDT on 05/22/2011, with BFN U3 (Br … At 1737 CDT on 05/22/2011, with BFN U3 (Browns Ferry Unit 3) in Mode 4, a valid RPS actuation signal was received by both channels of the RPS due to Scram Discharge Volume (SDV) High Water Level. </br>At 1735, while performing IRM range 6 to 7 correlation, Instrument Maintenance technicians were measuring high voltage on IRM 'G' while reconnecting a high voltage cable. A spike occurred on IRM's 'C' and 'D' causing a full Reactor Scram. This IRM (Intermediate Range Monitor) Scram was not a valid actuation, the safety function had already been completed, and is not reportable. At 1737, after diagnosing the cause of the IRM Scram, operators reset the Scram signal and received a valid RPS Scram signal due to SDV High Water Level. Investigation is ongoing.</br>This condition is reportable under 10CFR50.72(b)(3)(iv)(A) - A valid actuation of any of the systems named in 50.72(b)(3)(iv)(B).</br>This is also reportable as 60 day written report IAW 10CFR 50.73(a)(2)(iv)(A).</br>This event was entered into the licensee's Corrective Action Program as SR# 373366.</br>There are no compensatory measures or LCO's in effect for this event, and all EDG's and offsite power lines are operable. There was no increase in plant risk as a result of this event. </br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
22:37:00, 22 May 2011 +
46,872 +
22:34:00, 22 May 2011 +
22:37:00, 22 May 2011 +
At 1737 CDT on 05/22/2011, with BFN U3 (Br … At 1737 CDT on 05/22/2011, with BFN U3 (Browns Ferry Unit 3) in Mode 4, a valid RPS actuation signal was received by both channels of the RPS due to Scram Discharge Volume (SDV) High Water Level. </br>At 1735, while performing IRM range 6 to 7 correlation, Instrument Maintenance technicians were measuring high voltage on IRM 'G' while reconnecting a high voltage cable. A spike occurred on IRM's 'C' and 'D' causing a full Reactor Scram. This IRM (Intermediate Range Monitor) Scram was not a valid actuation, the safety function had already been completed, and is not reportable. At 1737, after diagnosing the cause of the IRM Scram, operators reset the Scram signal and received a valid RPS Scram signal due to SDV High Water Level. Investigation is ongoing.</br>This condition is reportable under 10CFR50.72(b)(3)(iv)(A) - A valid actuation of any of the systems named in 50.72(b)(3)(iv)(B).</br>This is also reportable as 60 day written report IAW 10CFR 50.73(a)(2)(iv)(A).</br>This event was entered into the licensee's Corrective Action Program as SR# 373366.</br>There are no compensatory measures or LCO's in effect for this event, and all EDG's and offsite power lines are operable. There was no increase in plant risk as a result of this event. </br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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00:00:00, 22 May 2011 +
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>.
22:27:59, 24 September 2017 +
22:34:00, 22 May 2011 +
false +
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-0.00208 d (-0.05 hours, -2.97619e-4 weeks, -6.849e-5 months) +
22:37:00, 22 May 2011 +
Valid Reactor Protection System (Rps) Actuation Signal - Scram Discharge Volume (Sdv) High Water Level +
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