05000456/FIN-2011002-03
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Finding | |
|---|---|
| Title | Inadequate Instructions for Measuring ECCS Voids |
| Description | The inspectors identified a finding of very low safety significance and an associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, when licensee personnel failed to account for vortexing when determining the maximum available time to secure flow from the containment spray additive tank. Specifically, the applicable calculation failed to account for the impact of vortexing, but assumed that the nitrogen in the tank would not enter the system until the tank was completely drained. The licensee entered this issue into the corrective action program and, at the time of the inspection, planned to revise the applicable calculation. The performance deficiency was determined to be more than minor because it was associated with the Structures, Systems, Components, and Barrier Performance attribute of the Barrier Integrity cornerstone and adversely affected the cornerstone objective of providing reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. The finding screened as having very low safety significance because it was a design deficiency of the physical integrity of the reactor containment that did not: (1) affect the barrier function of the control room against smoke or a toxic atmosphere; (2) represent an actual open pathway in the physical integrity of reactor containment; and (3) involve an actual reduction in function of hydrogen igniters in the reactor containment. The inspectors determined that this finding had a cross-cutting aspect in the area of Problem Identification and Resolution, Operating Experience, because the licensee did not thoroughly evaluate external operating experience. |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2011002 Section 4OA5 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | D Betancourt E Duncan J Benjamin J Gall J Gilliam M Holmberg M Perry M Thorpe Kavanaugh N Feliz Adorno R Jicklin |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Braidwood - IR 05000456/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2011Q1
Self-Identified List (Braidwood)
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