Finding | |
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| Title | Leakage From Reactor Coolant Pump 2B Discharge Pipe Instrument Nozzle |
| Description | The inspectors identified an unresolved item for pressure boundary leakage from reactor coolant pump 2B discharge pipe instrument nozzle. On April 10, 2016, during the Unit 1 Refueling Outage 19, the licensee discovered reactor coolant system pressure boundary leakage at instrument nozzle 1JRCETW0121Y on the 2B reactor coolant pump discharge piping. The leakage was discovered during a planned visual inspection of Unit 1 hot and cold leg nozzles. The leak was not detectable by either the reactor coolant system leak rate procedure or the containment radiation monitor trend reviews while the unit was operating. Additionally, the leak had not been visually detected during the previous refueling outage. The leakage was consistent with a small leak characterized by moderate boric acid accumulation at the leakage site. The licensee determined that the cause of the leakage was primary water stress corrosion cracking of the Alloy 600 instrument nozzle. The licensee corrected the leakage using a mechanical nozzle seal assembly repair method utilizing ASME Code Case N-733, Mitigation of Flaws in NPS 2 (DN 50) and Smaller Nozzles and Nozzle Partial Penetration Welds in Vessels and Piping by Use of a Mechanical Connection Modification,Section XI, Division 1. The evaluation of the 2B cold leg RTD nozzle leakage is being evaluated by the licensee as part of Palo Verde Action Request 15-01640-012. The inspectors reviewed the circumstances surrounding the discovery of the leak and observed portions of the repair activity during the refueling outage. Once the licensee completes their evaluation, the inspectors will review and complete an inspection to determine if a performance deficiency exists as a result of the nozzle failure. |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2016002 Section 1R08 |
| Date counted | Jun 30, 2016 (2016Q2) |
| Type: | URI: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | B Larson C Peabody C Steely D Reinert D You G Miller J Drake M Bloodgood W Sifrec Peabodyd Reinert D You G Guerra G Miller G Pick I Anchondo J Drake L Carson N Greene D Tailleart |
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Finding - Palo Verde - IR 05000528/2016002 | ||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2016Q2
Self-Identified List (Palo Verde)
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