The Effect of on-Line Noble Metal Addition on the Shut Down Dose Rates of Boiling Water Reactors
Abstract
On-line noble metal chemical addition (OLNC) is the third generation of hydrogen water chemistry developed to maintain the ECP of boiling water reactor structural materials in a range that mitigates intergranular stress corrosion cracking. The method utilizes the on-line injection of dilute Na2Pt(OH)6 into the feedwater over a period of approximately 10 days. The first application of OLNC occurred in July of 2005 and a total of 17 BWRs have applied the technology to date, with many more applications scheduled. It is expected that OLNC will become the de facto standard because it eliminates 60 hours of outage application time and it addresses the crack flanking concerns that can arise under certain conditions. Shut down dose rate data are now available for 7 plants, several with multiple cycles. This paper examines this behavior and it's implication for optimizing future OLNC applications and post application operations./
- Publication:
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Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors
- Pub Date:
- 2016
- DOI:
- 10.1007/978-3-319-48760-1_121
- Bibcode:
- 2016edmn.conf.2023C
- Keywords:
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- Materials Science