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A SL-III violation of Title 10 of the Code … A SL-III violation of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix A, Criterion 17, Electric Power Systems, was self-revealed on April 17, 2013, when a lightning strike and corresponding C phase fault on 138kV line 0112 occurred in the 138kV switchyard and caused a dual unit loss of offsite power (LOOP). Specifically, the lightning strike and corresponding phase to ground fault caused flashovers due to improperly installed ground segments in the 138kV switchyard grounding system installation. The licensee performed a Root Cause Investigation under report number 1503409-04, and identified several deficiencies in the quality of construction of the 138kV switchyard grounding system that allowed a lightning induced fault to flash over onto the DC protective system. The degradation was due to inadequate workmanship during initial installation of the 138kV ground system in the 138kV switchyard. In accordance with Inspection Manual Chapter 0612, Power Reactor Inspection Reports, Appendix B, Issue Screening, the inspectors determined that this issue did not meet the definition of a performance deficiency since it was not reasonably within the licensees ability to foresee and correct. However, this issue was a violation of 10 CFR 50, Appendix A, Criterion 17, Electric Power Systems. Therefore, the traditional enforcement process was used in accordance with the NRC Enforcement Policy. The violation was similar to one example in the Enforcement Policy under SL-III violations, Section 6.1(c) (5), Equipment failures caused by inadequate or improper maintenance substantially complicate recovery from a plant transient. Although the improper grounding system was a result of improper installation rather than improper maintenance, the inspectors determined that the violation met the intent of the example. The NRC determined that this violation resulted from matters not reasonably within the licensees control; that is, the failure to meet the requirements could not be readily identified and addressed. Therefore, in accordance with the Enforcement Policy, and after consultation with the Director of the Office of Enforcement, the NRC has decided to exercise enforcement discretion in accordance with Section 3.5 of the NRC Enforcement Policy and to refrain from issuing enforcement action for the violation. In accordance with the NRCs Reactor Oversight Process, this condition will not be considered in the assessment process or the NRCs Action Matrix.essment process or the NRCs Action Matrix.

Discovered date

23:59:59, 30 September 2015 +

Docket

05000373 + and 05000374 +

Event date

23:59:59, 30 September 2015 +

Finding integer

1 +

Finding type

Finding +

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Identified by

Self-revealing +

Inspection Manual Chapter

NRC Inspection Manual 0612, Power Reactor Inspection Reports +

Inspection procedure

IP 71153, Event Followup +

Inspection report

IR 05000373/2015010 +

Inspector

Michael Kunowski +, M Jeffers +, R Jickling +, M Munir +, Dariusz Szwarc +, Ijaz Hafeez +, R Daleyb + and Kemkerk Carrington +

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>.

00:54:21, 21 February 2018 +

Person