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Technical Specification (TS) 3.8.4, DC Sou … Technical Specification (TS) 3.8.4, DC Sources Operating, requires two operable trains of DC sources while in Modes 1 through 4. TS 3.8.7, Inverters Operating, requires two operable trains of inverters while in Modes 1 through 4. Technical Specification 3.8.9, Distribution Systems Operating, requires the Train A and Train B subsystems of the DC and AC vital bus systems be operable in Modes 1 through 4. Technical Specifications 3.7.11, Control Room Air Conditioning System, requires two trains of Control Room Air Conditioning be operable in Modes 1 through 6. Technical Specification Limiting Condition for Operation (LCO) 3.0.3 requires, in part, that when an LCO is not met and the associated actions are not met or an action is not provided, the unit shall be placed in a Mode in which the LCO is not applicable, or take action within one hour to place the plant in Mode 3 within the next 7 hours, Mode 4 within the next 13 hours, and Mode 5 within 37 hours. Contrary to the above, two trains of Class 1E electrical equipment air conditioning were not functional in Modes 1 through 4, but the licensee did not take action within one hour to place the plant in Mode 3 within the next 7 hours, Mode 4 within the next 13 hours, and Mode 5 within 37 hours. Specifically, the licensee over-torqued mounting screws on air conditioning units SGK04B and SGK05B during their respective maintenance activities performed on August 12, 2011, and May 30, 2012, rendering these air conditioning units and their supported systems inoperable. The licensee failed to restore air conditioning units SGK04B and SGK05B to operable status until March 22 and March 23, 2013; and thus exceeded the allowed action times of the respective Technical Specifications. Using Inspection Manual Chapter 0609, Appendix A, Exhibit 2, the inspectors performed a significance determination screening and determined that a more detailed risk evaluation was required because the finding potentially represented an actual loss of safety function for a single train for greater than the technical specification allowed outage time. The Senior Reactor Analyst determined that since the mounting screws did not actually fail, and their function is to prevent failure during a seismic event, and because of the low probability of a seismic event leading to core damage or early release, this violation is of very low safety significance (Green). This violation was entered into the licensees corrective action program as Condition Report 65421. action program as Condition Report 65421.

Discovered date

23:59:59, 30 September 2013 +

Docket

05000482 +

Event date

23:59:59, 30 September 2013 +

Finding integer

2 +

Finding type

Non-cited violation +

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>.

Hours

8.101852e-5 d (0.00194 hours, 1.157407e-5 weeks, 2.6635e-6 months) +, 1.50463e-4 d (0.00361 hours, 2.149471e-5 weeks, 4.9465e-6 months) + and 4.282407e-4 d (0.0103 hours, 6.117725e-5 weeks, 1.40785e-5 months) +

Identified by

Licensee-identified +

Inspection Manual Chapter

NRC Inspection Manual 0609/Appendix A, The Significance Determination Process (SDP) for Findings At-Power +

Inspection report

IR 05000482/2013004 +

Inspector

J Laughlin +, N O'Keefe +, R Stroble +, Christopher Hunt +, Charley Peabody + and Mike Williams +

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>.

15:47:53, 30 May 2018 +

Person