05000454/FIN-2011013-01
Finding | |
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| Title | Restoring Compliance With Respect to Single Failures |
| Description | On January 19, 2011, the NRC issued IR 05000454/2011010; 05000455/2011010, and notified the licensee of the agencys decision to issue a compliance backfit in order to address the technical issue. The report listed the licensees initial corrective actions and requested the licensee to provide a written response within 30 days of their assessment of the issue and a description of their intended actions to address the non-compliance, including a proposed schedule to complete those actions and an assessment of the extent of condition of this issue
The licensee responded by letter dated February 18, 2011, and committed to the following 1. The power supplies to the Steam Generators PORVs will be modified with a safety-related battery backup. The committed date for performing this action was no later than Unit 1s October 2012 refueling outage and Unit 2s May 2013 refueling outage 2. The licensee will issue a supplement to their February 18, 2011, response letter, in order to communicate any revisions to the modification installation schedule based on the online/outage determination (i.e., whether the modification could be installed online or require an outage). The committed date for performing this action is October 14, 2011 3. An extent of condition review will be conducted of other transients and accidents outlined in Chapter 15 of the Byron Station Updated Final Safety Analysis Report to identify similar discrepancies with respect to the inappropriate reliance or assumption of single active failure. The identified discrepancies, if any, would be resolved within the Corrective Action Program and communicated to the NRC Region III Regional Administrator. The committed date for performing this action is August 4, 2011 The NRC staff considered these actions and timeframe adequate for complying with the agencys requirements In accordance with the Reactor Oversight Process (ROP) Inspection Manual Chapter (IMC) 0612, Appendix B, Issue Screening, the staff determined that this issue did not meet the definition for a performance deficiency since it was not reasonably within the licensees ability to foresee and correct. In accordance with Inspection Manual Chapter 0612, the inspectors determined whether this issue of concern involved a more than minor violation. In order to assess the significance of the underlying technical issue associated with the violation, the inspectors used the guidance in IMC 0612, Appendix B, Issue Screening, and IMC 0609 Significance Determination Process. Based on these, the underlying technical issue was a Non-Finding (i.e., no performance deficiency), was considered a more-than-minor violation, and from a risk perspective, screened as having very low safety significance. The inspectors determined that no example from either Section 6.1 or 6.9 of the Enforcement Policy adequately applied or described the situation. Therefore, Regional NRC management considered the risk significance of the underlying technical issue and, in consultation with the Office of Enforcement, determined the issue was best represented as a Severity Level IV violation This violation is not considered a finding; therefore, in accordance with IMC 0305, no cross-cutting aspect is assigned to the violation. |
| Site: | Byron  |
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| Report | IR 05000454/2011013 Section 4OA5 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | TEV: Severity level IV |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Thompson D Jones E Duncan J Cassidy J Laughlin J Mcghee J Robbins M Holmberg M Jones N Feliz Adorno R Ng S Sheldon B Bartlett B Palagia Stonej Coroju Sandina Garmoeb Bartlett B Jose C Thompson E Duncan E Sanchez Santiago J Cassidy J Dalzell J Robbins R Ng |
| INPO aspect | |
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Finding - Byron - IR 05000454/2011013 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2011Q2
Self-Identified List (Byron)
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