05000255/FIN-2010005-03
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Finding | |
|---|---|
| Title | Head Corrosion Not Evaluated |
| Description | A finding of very low safety significance (Green) and associated NCV of 10 CFR Part 50 Appendix B, Criterion V, Instructions, Procedures and Drawings, was identified by the inspectors for the licensees failure to follow Procedure CEP-NDE-0955, Visual Examination of Bare-Metal Surfaces, and perform a bare metal visual examination of vessel head penetration nozzles Nos. 1 and 3 within 4 feet. Instead, the licensee performed the examination at approximately 5 feet and the illumination level at this distance had not been demonstrated as adequate to detect PCS leakage. On October 17, 2010, the inspectors identified that the licensee failed to follow Procedure CEP-NDE-0955, Visual Examination of Bare-Metal Surfaces, to ensure that evidence of PCS leakage could be detected at nozzles Nos. 1 and 3. During observation of the licensees bare metal visual examination to detect evidence of head penetration nozzle leakage in accordance with Code Case N-729-1, the inspectors noted that the vessel head area was not well illuminated. In particular, areas near the top of the head and center nozzles (i.e., nozzles Nos. 1 and 3) could not be seen due to the lack of ambient light. The Code Case N-729-1 describes the bare metal visual head examination as a Visual Examination and sufficient illumination must be demonstrated by resolving 0.105 inch high lower case alpha numeric characters. Just prior to commencing the bare metal visual head examination, the licensees examiner demonstrated adequate illumination at 4 feet by applying supplemental light from a portable light source to resolve lower case alpha numeric characters less than 0.105 inches tall on a visual acuity card. For nozzles Nos. 1 and 3 near the center of the head, the licenses examiner used a portable light to complete the visual examination from approximately 54 to 60 inches, which exceeded the maximum distance of 4 feet allowed by the Procedure CEP-NDE-0955, Visual Examination of Bare-Metal Surfaces. Because illumination levels had not been demonstrated as adequate for this distance, the inspectors were concerned that the licensee would not be able to detect evidence of PCS leakage (e.g., boric acid deposits). As a corrective action, the licensees examiner repeated the bare metal visual examination of nozzles Nos. 1 and 3 and surrounding head surfaces at a distance of less than 4 feet and did not identify any evidence of PCS leakage. |
| Site: | Palisades  |
|---|---|
| Report | IR 05000255/2010005 Section 1R08 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | M Holmberg J Cassidy J Ellegood R Walton T Taylor J Beaversm Holmbergb Jose J Cassidy M Mitchell J Ellegood T Taylor J Corujo-Sandin G Hansen |
| INPO aspect | |
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Finding - Palisades - IR 05000255/2010005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palisades) @ 2010Q4
Self-Identified List (Palisades)
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