05000390/FIN-2017007-04
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Finding | |
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| Title | Potential Failure to Justify Qualification of O-Rings by Commercial Grade Dedication |
| Description | The inspectors opened a URI to review the adequacy of critical characteristics identified for commercial grade dedication of O-rings used in an EQ application. In 2008, TVA began to dedicate commercial grade O-rings from Parker Hannifin through a vendor, Qualtech. The O-rings are used in components that must operate in harsh environments and thus are subject to the strict requirements in 10 CFR 50.49. The dedication process used Fourier Transfer Infrared Spectroscopy (FTIR) to identify chemical characteristics, durometer to measure rubber hardness, and visual inspection to verify physical dimensions and color. When asked if this FTIR or durometer test can verify activation energy or other aging mechanisms, the licensee 10 stated, that FTIR cannot by itself validate activation energy or thermal aging mechanisms. Further review is needed to determine the limitations involved with the accuracy of FTIR and durometer testing. The inspectors could not verify that this dedication process specified the required critical characteristics to ensure compliance with 10 CFR 50.49. The inspectors further questioned how uncertainties could be determined and evaluated from these techniques. Since the licensee is relying on this dedication process, the components were not aged and tested in accordance with 10 CFR 50.49 requirements. The licensee contends that the verification of the material by FTIR and durometer analysis provided reasonable assurance that the original qualification test reports by Westinghouse remained applicable to the dedicated O-rings. This URI is opened to determine if a performance deficiency exists and it is identified as URI 05000390/2017007-04 and 05000391/2017007-04, Potential Failure to Justify Qualification of O-Rings by Commercial Grade Dedication. |
| Site: | Watts Bar  |
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| Report | IR 05000390/2017007 Section 1R21 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | E Stamm T Fanelli T Su J Bartley |
| INPO aspect | |
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Finding - Watts Bar - IR 05000390/2017007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2017Q2
Self-Identified List (Watts Bar)
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