05000263/FIN-2009007-07
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Finding | |
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Title | Pipe Support Design Deficiencies |
Description | The inspectors identified an NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, having very low safety-significance for the failure of two pipe supports to meet their design requirements. Specifically, the calculation for pipe support SR-526 failed to use the minimum yield strength in determination of the allowable bending stress of the pipe support baseplate as required in the American Institute of Steel Construction code. In addition, the calculation for pipe support PS-16 failed to use the design basis concrete compressive strength in determination of the anchor bolt allowable as required in the licensees design specification. This finding was entered into the licensees corrective action program and a preliminary analysis performed by the licensee concluded that the pipe supports were operable but nonconforming. The performance deficiency for pipe support SR-526 example was more than minor because it was associated with the Mitigating Systems cornerstone attribute of design control and affected the cornerstone objective of ensuring the availability, reliability, and capability of the safety-related residual heat removal and core spray pumps. This finding is of very low safety-significance (Green) because the design deficiency was confirmed not to result in loss of operability or functionality. The performance deficiency for pipe support PS-16 example was more than minor because it was associated with the Barrier Integrity cornerstone attribute of design control and affected the cornerstone objective of providing reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. This finding is of very low safety-significance (Green) because there was no actual barrier degradation. The inspectors did not identify a cross-cutting aspect associated with this finding because this was a legacy design issue and therefore was not reflective of current performance. |
Site: | Monticello |
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Report | IR 05000263/2009007 Section 4OA5 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems, Barrier Integrity |
Identified by: | NRC identified |
Inspection Procedure: | |
Inspectors (proximate) | A Dunlop A Stone C Brown H Campbell J Bozga L Jones M Munir N Feliz Adomo S Kobylarz |
INPO aspect | |
Finding closed by | |
IR 05000263/2009007 (6 January 2010) | |
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Finding - Monticello - IR 05000263/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Monticello) @ 2009Q4
Self-Identified List (Monticello)
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