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Title: RESULTS OF THE 2H EVAPORATOR ACID CLEANING AND IN-POT NEUTRALIZATION

Abstract

The estimated 200 gallons of sodium aluminosilicate scale (NAS) present in the 242-16H Evaporator pot prior to chemical cleaning was subjected to four batches of 1.5 M (9 wt%) nitric acid. Each batch was neutralized with 19 M (50 wt %) sodium hydroxide (caustic) before transfer to Tank 38. The chemical cleaning process began on November 20, 2006, and was terminated on December 10, 2006. An inspection of the pot's interior was performed and based on data gathered during that inspection; the current volume of scale in the pot is conservatively estimated to be 36.3 gallons, which is well below the 200 gallon limit specified in the Technical Safety Requirements. In addition, the performance during all aspects of cleaning agreed well with the flowsheet developed at the bench and pilot scale. There were some lessons learned during the cleaning outage and are detailed in appendices of this report.

Authors:
; ;
Publication Date:
Research Org.:
SRS
Sponsoring Org.:
USDOE
OSTI Identifier:
921968
Report Number(s):
WSRC-STI-2007-00286
TRN: US0802137
DOE Contract Number:
DE-AC09-96SR18500
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; CLEANING; EVAPORATORS; FLOWSHEETS; NITRIC ACID; PERFORMANCE; SAFETY; SODIUM SILICATES; ALUMINIUM SILICATES; DESCALING

Citation Formats

Wilmarth, B, Phillip Norris, P, and Terry Allen, T. RESULTS OF THE 2H EVAPORATOR ACID CLEANING AND IN-POT NEUTRALIZATION. United States: N. p., 2007. Web. doi:10.2172/921968.
Wilmarth, B, Phillip Norris, P, & Terry Allen, T. RESULTS OF THE 2H EVAPORATOR ACID CLEANING AND IN-POT NEUTRALIZATION. United States. doi:10.2172/921968.
Wilmarth, B, Phillip Norris, P, and Terry Allen, T. Tue . "RESULTS OF THE 2H EVAPORATOR ACID CLEANING AND IN-POT NEUTRALIZATION". United States. doi:10.2172/921968. https://www.osti.gov/servlets/purl/921968.
@article{osti_921968,
title = {RESULTS OF THE 2H EVAPORATOR ACID CLEANING AND IN-POT NEUTRALIZATION},
author = {Wilmarth, B and Phillip Norris, P and Terry Allen, T},
abstractNote = {The estimated 200 gallons of sodium aluminosilicate scale (NAS) present in the 242-16H Evaporator pot prior to chemical cleaning was subjected to four batches of 1.5 M (9 wt%) nitric acid. Each batch was neutralized with 19 M (50 wt %) sodium hydroxide (caustic) before transfer to Tank 38. The chemical cleaning process began on November 20, 2006, and was terminated on December 10, 2006. An inspection of the pot's interior was performed and based on data gathered during that inspection; the current volume of scale in the pot is conservatively estimated to be 36.3 gallons, which is well below the 200 gallon limit specified in the Technical Safety Requirements. In addition, the performance during all aspects of cleaning agreed well with the flowsheet developed at the bench and pilot scale. There were some lessons learned during the cleaning outage and are detailed in appendices of this report.},
doi = {10.2172/921968},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 29 00:00:00 EDT 2007},
month = {Tue May 29 00:00:00 EDT 2007}
}

Technical Report:

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