05000346/FIN-2012003-02
From kanterella
Revision as of 14:04, 30 September 2017 by StriderTol (talk | contribs) (Created page by program invented by StriderTol)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Finding | |
|---|---|
| Title | N/A |
| Description | The NRC Maintenance Rule, 10 CFR 50.65(a)(4), states that before performing maintenance activities (including but not limited to surveillance, post-maintenance testing and corrective and preventive maintenance), the licensee shall assess and manage the increase in risk that may result from the proposed maintenance activities. Contrary to the above, on June 27, 2012, the licensee failed to assess and manage the risk associated with having Startup Transformer 02 and HPI Pump 1 unavailable at the same time. The two activities were not originally scheduled to occur simultaneously, and the licensees probabilistic risk assessment (PRA) separately evaluated these activities as Green PRA risk. However, the maintenance to the Ohio Edison offisite power line (causing Startup Transformer 02 unavailability) was moved up one day in the schedule. Also, the HPI Pump 1 testing ran later than expected and crossed into the time when Startup Transformer 02 was unavailable. The station was in Yellow PRA risk for approximately 14 minutes. Although the appropriate oversight for each activity was already assigned, risk was not managed correctly because plant personnel remained unaware of the change to Yellow risk. The licensee failed to make procedurally required communications such as unit log entries, plant public address system announcements, and changes to the station risk status display at the sites Primary Access Facility. The inspectors reviewed this issue using the guidance contained in Appendix B, Issue Screening, of Inspection Manual Chapter (IMC) 0612, Power Reactor Inspection Reports. The inspectors determined that the violation was more than minor because the performance deficiency was sufficiently similar to the more-than-minor example 7.e in Appendix E of IMC 0612. Specifically, the overall elevated plant risk put the plant into a higher licensee-established risk category. The finding screened as very low safety significance (Green) using IMC 0609, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, using flowchart 1 for the assessment of risk deficit. The licensee had entered this issue into their CAP as CR 2012-10360. A late entry into the unit narrative log was made on June 28, 2012, documenting the unscheduled yellow PRA risk. |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2012003 Section 4OA7 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Wilson D Kimble J Cameron P Smagacz T Briley J Steffes M Mitchell J Rutkowski D Jones |
| INPO aspect | |
| ' | |
Finding - Davis Besse - IR 05000346/2012003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Davis Besse) @ 2012Q2
Self-Identified List (Davis Besse)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||