05000313/FIN-2017008-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate FLEX Power Supply Connections |
| Description | Green. The team identified a finding for the fail ure to assure that FLEX power supply connections would be reliable following all required postulated beyond design basis external events . Specifically, the team identified that one installed cable configuration could potentially be damaged during high wind events preventing operation of the portable diesel generator required to operate plant equipment. This issue was entered into the licensees corrective action program as Condition Report CR- ANO -C-2017- 00316. The failure to adequately ins tall the electrical modification for connecting the portable diesel generator was a performance deficiency. The performance deficiency was more than minor because it was associated with the protection against external factors attribute of the Mitigating S ystems Cornerstone and adversely affected the Mitigating Systems Cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The significance of the find ing was evaluated using NRC Inspection Manual Chapter 0609, Appendix O, Significance Determination Process for Mitigating Strategies and Spent Fuel Pool Instrumentation (Orders EA -12- 049 and EA -12-051), dated October 7, 2016, and Appendix M , Significance Determination Process Using Qualitative Criteria, dated April 12, 2012. A bounding evaluation was performed using the exposure time, tornado frequency, and frequency of a random failure of both emergency diesel generators. The licensees compliance date with the order was January 12, 2016, so an exposure time of one year was used. The tornado frequency selected was for an F2 or greater tornado striking the site (5.31E -5/year). The random failure frequency of both units emergency diesel generators (3.15E -3/year) was selected since the emergency diesel generators are protected from damage during high wind events. This is a conservative bounding analysis because it assumes that any tornado would result in damage causing a loss of offsite p ower and damage the cables in terminal panel 2TB1011 on the roof. The change in core damage frequency for the finding was determined to be 1.67E -7/year. Therefore, the finding was determined to a very low risk significance . The findi ng had a cross-cutti ng aspect in the challenge to the unknown co mponent of Human Performance becau se the lice nsee failed to adequately address all potential damage scenarios when developing the modification design requirements for beyond design basis external events [H.11] |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2017008 Section 4OA5 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 2515/191 |
| Inspectors (proximate) | J Mateychick T Sullivan M Tobin E Uribe N O'Keefe |
| CCA | H.11, Challenge the Unknown |
| INPO aspect | QA.2 |
| ' | |
Finding - Arkansas Nuclear - IR 05000313/2017008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Arkansas Nuclear) @ 2017Q2
Self-Identified List (Arkansas Nuclear)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||