Prevention for possible microbiologically influenced corrosion (MIC) in RHLWE flush water system

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Description

This report is in response to the request to provide a recommendation for the prevention of possible microbiologically influenced corrosion (MIC) for the RHLWE (Replacement High-Level Waste Evaporator) flush water (FW) system. The recent occurrences of MIC at DWPF prompted HLWE to evaluate the possibility of MIC occurring in this 304L stainless steel RHLWE flush water system. Concern was heightened by the fact that the well water used and the other conditions at H-Tank Farm are similar to those at DWPF. However, only one known leak has occurred in the existing 304L evaporator flush water systems in either tank farm ... continued below

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30 p.

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Hsu, T.C. & Jenkins, C.F. July 10, 1995.

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Description

This report is in response to the request to provide a recommendation for the prevention of possible microbiologically influenced corrosion (MIC) for the RHLWE (Replacement High-Level Waste Evaporator) flush water (FW) system. The recent occurrences of MIC at DWPF prompted HLWE to evaluate the possibility of MIC occurring in this 304L stainless steel RHLWE flush water system. Concern was heightened by the fact that the well water used and the other conditions at H-Tank Farm are similar to those at DWPF. However, only one known leak has occurred in the existing 304L evaporator flush water systems in either tank farm (in 1H system), and no MIC Corrosion has been confirmed in the tank farm area. The design of the RHLWE flush water system (completed long before the occurrence of MIC at DWPF) was modeled after the existing evaporator flush water systems and did not specifically include MIC prevention considerations. Therefore, MIC prevention was not specifically considered during the design phase of this flush water system. The system is presently being installed. After an extensive evaluation, a task team concluded that the best biocide to prevent the occurrence of MIC would be NaOH at fairly low concentration. Sodium hydroxide (NaOH) is optimal in this application, because of its effectiveness, low cost, and familiarity to the Operations personnel (see Appendix A). However, it is the opinion of the task group that application should be withheld until MIC corrosion is demonstrated in the system.

Physical Description

30 p.

Notes

INIS; OSTI as DE96002906

Source

  • Other Information: PBD: 10 Jul 1995

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  • Other: DE96002906
  • Report No.: WSRC-TR--95-0122
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/155020 | External Link
  • Office of Scientific & Technical Information Report Number: 155020
  • Archival Resource Key: ark:/67531/metadc621757

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  • July 10, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 9, 2016, 6:27 p.m.

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Hsu, T.C. & Jenkins, C.F. Prevention for possible microbiologically influenced corrosion (MIC) in RHLWE flush water system, report, July 10, 1995; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc621757/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.