05000443/FIN-2011002-01
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Finding | |
|---|---|
| Title | Failure to Monitor Condition of Control Building per 10CFR50.65(a)(1) |
| Description | lnspectors identified a non-cited violation of 10 CFR 50.65(aX1 ) because NextEra did not adequately monitor the condition of an in-scope structure under the Maintenance Rule (MR). Specifically, NextEra did not evaluate the results of their periodic inspections of the condition of the Control Building (CB) to determine the extent and rate of degradation to the structure. Further, in August 2010 after NextEra identified CB concrete strength degradation that called into question the effectiveness of that structures preventative maintenance program, NextEra did not classify the CB as MR (aX1). NextEra entered the degraded structural concrete issue into its corrective action program to address the extent of condition and establish a mitigation strategy (ARs 57412Q and 581434)Ior all in-scope structures. NextEra also initiated AR 1636419 to complete the evaluation for placing the CB into (a)(1) status. This performance deficiency is more than minor because if left uncorrected, the condition could have resulted in the loss of function for the CB structure due to degrading concrete material properties of structures and systems designed to mitigate design basis events. The finding had very low safety significance because despite degraded concrete conditions and loss of design margin, the CB structure remained operable. The inspectors performed a Phase 1 Significance Determination Process (SDP) screening, in accordance with NRC Inspection Manual Chapter (lMC) 0609, Attachment 4, and determined the issue was of very low safety significance (Green) because the finding was not a design or qualification deficiency, did not result in an actual loss of safety function, was not a loss of barrier function, and was not potentially risk significant for external events. This finding had a cross-cutting aspect in the area of problem identification and resolution, evaluation (P.1(c)) because NextEra did not ensure issues adverse to quality potentially impacting nuclear safety were promptly identified and evaluated. Specifically, NextEra did not thoroughly evaluate indications of concrete degradation for the CB to determine the extent and rate of degradation to the structure, and once concrete degradation due to alkali-silica-reaction (ASR) distress was identified, NextEra did not evaluate the issue within the context of the MR program to assure the condition of structures was controlled to maintain design margins. |
| Site: | Seabrook  |
|---|---|
| Report | IR 05000443/2011002 Section 1R12 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | T Moslak L Scholl W Raymond A Burritt J Johnson A Turilin J Deboer |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Seabrook - IR 05000443/2011002 | |||||||||||||||||||
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Finding List (Seabrook) @ 2011Q1
Self-Identified List (Seabrook)
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