05000454/FIN-2011002-05
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Finding | |
|---|---|
| Title | Failure to Evaluate the Effects of Dynamic Loads at the CS Discharge Piping |
| Description | An NRC-identified finding of very low safety significance and an associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the inspectors when licensee personnel failed to evaluate the effects of dynamic loads at the containment spray discharge piping. The inspectors were concerned because portions of the containment spray discharge piping were normally voided by design and neither the structural design nor operation of the system addressed the dynamic loads that would result when the voided piping was rapidly filled following system initiation. The licensee entered this issue into the corrective action program and, at the time of the inspection, planned to include an evaluation of dynamic loads into the design basis of containment spray. 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 did not affect either core damage frequency or large early release frequency. 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: | Byron  |
|---|---|
| Report | IR 05000454/2011002 Section 4OA5 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Ng C Thompson B Bartlett J Robbins J Cassidy M Jones E Duncan J Gilliam W Lyon C Tilton J Miller J Whitman |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
| ' | |
Finding - Byron - IR 05000454/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2011Q1
Self-Identified List (Byron)
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