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05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing
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Category
LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT  and Licensee Event Report
Accession number
ML20217Q943  +
Docket
05000414  +  and 00414  +
Equipment trip
Reactor Trip +  and Turbine Trip +
From
Duke Energy +, Gordon Peterson +  and Birch M +
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>.
05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +, 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +  and 05000414/LER-1997-006-02, :on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +
Hours
0.0257 d (0.618 hours, 0.00368 weeks, 8.458515e-4 months)  +, 0.0191 d (0.458 hours, 0.00272 weeks, 6.266835e-4 months)  +, 0.0269 d (0.644 hours, 0.00384 weeks, 8.8276e-4 months)  +, 0.00397 d (0.0953 hours, 5.671296e-4 weeks, 1.305115e-4 months)  +, 0.0015 d (0.0361 hours, 2.149471e-4 weeks, 4.9465e-5 months)  +, 0.00182 d (0.0436 hours, 2.595899e-4 weeks, 5.97385e-5 months)  +, 0.0174 d (0.417 hours, 0.00248 weeks, 5.7075e-4 months)  +, 0.0226 d (0.543 hours, 0.00323 weeks, 7.44258e-4 months)  +, 0.00148 d (0.0356 hours, 2.116402e-4 weeks, 4.8704e-5 months)  +, 0.00584 d (0.14 hours, 8.349868e-4 weeks, 1.921525e-4 months)  +, 0.0174 d (0.418 hours, 0.00249 weeks, 5.73033e-4 months)  +, 0.0249 d (0.599 hours, 0.00356 weeks, 8.199775e-4 months)  +  and 2.314815e-5 d (5.555556e-4 hours, 3.306878e-6 weeks, 7.61e-7 months)  +
Issue date
August 25, 1997  +
LER
05000414/LER-95-001 +
LER number
6  +
LER year
1,997  +
Licensing Basis Document
Updated Final Safety Analysis Report +
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>.
08:26:40, 23 May 2025  +
NRC form
NRC Form 366, Licensee Event Report +
Page count
10  +
Reporting criterion
10 CFR 50.73(a)(2) +  and 10 CFR 50.73(a)(2)(x) +
SSC
2SM-1 +, 2SM-3 +, 2SM-5 +, 2SM-7 +, 2FM-1 +  and 1Q0-20 +
Scram
Manual Scram +  and Automatic Scram +
Site
Catawba +
Start date
August 25, 1997  +
State
Washington +
System
Steam Generator +, Feedwater +, Main Steam Isolation Valve +, Auxiliary Feedwater +, Main Turbine +, Emergency Core Cooling System +, Control Rod +  and Main Steam +
Title
:on 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing   +
Title:
On 970726,manual Reactor Trips Occurred Due to Closure of MSIV 2SM-1.Caused by Failure of Digital Optical Isolator (Doi) within Control Circuitry of MSIV 2SM-1. Replaced Failed Dois & Improved Doi Testing +
To
Office of Information Resources Management +
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.
https://lersearch.inl.gov/Index.aspx?Page=PDFView?Doc::4141997006R02.pdf  +  and http://pbadupws.nrc.gov/docs/ML2021/ML20217Q943.pdf  +
Work order
WO 97071099#01 +, WO 97071254#01 +, WO 97071253#01 +  and WO 97071252#01 +
 
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