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Technical Specification 3.8.9, Distributio … Technical Specification 3.8.9, Distributions Systems Operating, limiting condition for operation requires that AC and DC electrical power distribution systems shall be operable in Modes 1 through 4. If one AC electrical power distribution system is inoperable for greater than 8 hours, the required action is to place the unit in Mode 3 within 6 hours and Mode 5 within 36 hours. Contrary to the above, on October 4, 2010, operations personnel failed to comply with required action of Technical Specification 3.8.9 limiting condition for operation to restore train A Class 1E 4kV bus 2A04 (AC electrical power distribution system) to operable status or place the unit in Mode 3 within 6 hours and Mode 5 within 36 hours. A Phase 3 evaluation was performed by a senior reactor analyst since the finding screened as potentially risk-significant due to a seismic initiating event. Using the San Onofre SPAR model, the delta-CDF for Bus 3A04 being non-functional was 5.2E-7/yr. The exposure period for this finding was 10.7 days over the TS 3.8.1 AOT and 13.37 days over the TS 3.8.9 allowed outage time. Therefore, this finding was determined to have very low significance (Green). This issue was entered into licensees corrective action program as Nuclear Notification NN 201113611.gram as Nuclear Notification NN 201113611. +

Discovered date

23:59:59, 31 March 2012 +

Docket

05000361 + and 05000362 +

Event date

23:59:59, 31 March 2012 +

Finding integer

6 +

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

9.259259e-5 d (0.00222 hours, 1.322751e-5 weeks, 3.044e-6 months) +, 6.944444e-5 d (0.00167 hours, 9.920635e-6 weeks, 2.283e-6 months) + and 4.166667e-4 d (0.01 hours, 5.952381e-5 weeks, 1.3698e-5 months) +

Identified by

Licensee-identified +

Inspection report

IR 05000361/2012002 +

Inspector

Ryan Lantz +, J Laughlin +, I Anchando +, Louis Carson +, John Reynoso +, Greg Warnick +, Natasha Greene +, Jim Melfi + and David You +

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>.

15:44:49, 30 May 2018 +

Person