05000313/FIN-2011002-01
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Finding | |
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| Title | Failure to Incorporate Adequate Clearance Guidance Prevents Full Operation of the Unit 1 Emergency Control Room Ventilation Makeup Air Supply Damper |
| Description | The inspectors documented a self-revealing noncited violation of 10 CFR 50, Appendix B, Criterion III for an inadequate design package. This inadequacy led to the interference and restricted function of the Unit 1 emergency control room ventilation system damper CV-7910, VSF-9 makeup air supply. Specifically, the engineering change, EC-25425, that was used to install a temporary modification to allow control room tracer gas testing, did not specify any clearance requirements between the temporary modification and the CV-7910, VSF-9 makeup air supply damper. This led to restricted damper operation and interference issues. The licensee took immediate action to remove the temporary modification and physically restructured the modification prior to continuing the tracer gas testing. This issue was entered into the corrective action program as CR-ANO- C-2010-2848. The failure to incorporate clearance requirements for the temporary modification between CV-7910 makeup air supply damper and the tracer gas ductwork adaptor, which prevented full operation of the damper, was determined to be a performance deficiency, because it was within the licensees ability for foresee and correct and is a violation of NRC requirements. The performance deficiency was determined to be more than minor because it was associated with the design control attribute of the Barrier Integrity cornerstone and adversely affected the cornerstone objective to provide reasonable assurance that the physical design barriers protect the public from radionuclide releases caused by accidents or events, 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, Green, because the finding did not represent a degradation of the barrier function for the control room against radiation, smoke or toxic gas. The finding was determined to have a crosscutting aspect in the area of human performance, associated with resources, in that the licensee did not apply the appropriate engineering thoroughness for the temporary modification due to resource sharing to assist other Entergy sites, and scheduling vacations, which caused an increase in workload during the review and approval of the temporary modification, H.2(c). |
| Site: | Arkansas Nuclear  |
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| Report | IR 05000313/2011002 Section 1R18 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | L Ricketson W Schaup A Sanchez B Baca C Graves I Anchondo J Clark J Melfi J Rotten |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Arkansas Nuclear - IR 05000313/2011002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2011Q1
Self-Identified List (Arkansas Nuclear)
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