05000313/FIN-2010004-06
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Finding | |
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| Title | Failure to Correctly Translate VCH-4B Design Requirements into Installed Plant Equipment |
| Description | The inspectors documented a self-revealing noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to assure that the applicable design basis for applicable structures, systems, and components were correctly translated into specifications, procedures, and instructions. Specifically, during initial plant installation, the licensee failed to correctly identify the effect redundant protective equipment interlocks could have on maintaining operability of VCH-4B design requirements upon a loss of normal non-safety related room cooling. This resulted in VCH-4B, emergency switchgear chiller, not being able to start and perform its design function due to a combination of high room temperature due to loss of normal non-safety related cooling, and normally energized compressor oil heaters which led to a high compressor oil temperature switch actuation that caused a lockout of the chiller that would have prevented a chiller start. The licensee entered this issue in their corrective action program as Condition Report CR-ANO-1-2010-2815. Failure to ensure that design requirements were correctly translated into installed plant equipment was a performance deficiency. The performance deficiency was determined to be more than minor because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone, and affected the associated cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences, and is therefore a finding. Using Manual Chapter 0609.04, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to have very low safety significance because: (1) the finding was not a qualification deficiency that resulted in a loss of functionality of chiller VCH-4B; (2) it did not lead to an actual loss of safety function of the system or train; (3) it did not result in an actual loss of safety function of a single train for greater than its technical specification allowed outage time; (4) it did not represent an actual loss of safety function of one or more non- technical specification trains of equipment designated as risk-significant per 10 CFR 50.65, for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; (5) it did not screen as potentially risk-significant due to a seismic, flooding, or severe weather initiating event. The inspectors determined that since the licensee had not recently re-evaluated the design of the emergency switchgear room chillers high oil temperature lockout; this finding did not represent current plant performance, and therefore did not have a crosscutting aspect associated with it (Section 1R22). |
| Site: | Arkansas Nuclear  |
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| Report | IR 05000313/2010004 Section 1R22 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | A Sanchez C Graves C Osterholtz D Stearns D Strickland J Clark J Josey J Rotton K Clayton L Ricketson T Pate |
| INPO aspect | |
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Finding - Arkansas Nuclear - IR 05000313/2010004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2010Q3
Self-Identified List (Arkansas Nuclear)
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