05000443/FIN-2011010-01
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Finding | |
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| Title | Adequacy of Corrective Actions Associated with Calculation Methods for Alkali-Silica Reaction Issue |
| Description | The NRC staff noted that the methods used in evaluating structural integrity for the selected buildings were based on the correct design basis code ACI318-1971. However, the mathematical relationships in this code were based on empirical data, from testing of non-degraded concrete, for determining key ratios that are a part of the design bases and used for determining tensile and shear strength or capacity in addition to compressive strength. These strength values were important in the building loading analysis during normal or upset conditions such as for seismic events. More importantly, while some testing for the modulus of elasticity was done, it was not clear if the plans would result in additional testing of concrete cores for this parameter or any independent testing associated with other key design parameters such as Poisson\\\'s Ratio, shear modulus, or bulk modulus. With these parameters known, various strengths or capacities can be determined such as for tensile and shear strength. In addition, the plans that the inspectors reviewed did not address variation in mechanical properties of the concrete in different directions due to ASR cracking nor the effect of the ASR expansion on stresses in the rebar. These parameters were important in order to ensure that the current licensing and design basis was maintained. The licensee representatives agreed to address the assumptions or establish relationships for the current conditions at Seabrook. Accordingly this area is unresolved pending completion of license actions as noted above and further NRC staff review. |
| Site: | Seabrook  |
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| Report | IR 05000443/2011010 Section 4OA2 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Shaikh G Thomas M Modes R Conte S Chaudhary W Raymonda Burritta Turilin J Deboer J Johnson T Burns T Moslak W Raymond |
| INPO aspect | |
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Finding - Seabrook - IR 05000443/2011010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Seabrook) @ 2011Q4
Self-Identified List (Seabrook)
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