FY2004 CORROSION SURVEILLANCE RESULTS FOR L-BASIN

One of 77 reports in the series: Fiscal Year 2004 available on this site.

PDF Version Also Available for Download.

Description

This report documents the results of the L-Basin Corrosion Surveillance Program for the fiscal year 2004. Test coupons were removed from the basin on February 12, 2004, shipped to Savannah River National Laboratory (SRNL), and visually examined in a contaminated laboratory hood. Selected coupons were metallurgically characterized to establish the extent of general corrosion and pitting. Pitting was observed on galvanically coupled and on intentionally creviced coupons, thus demonstrating that localized concentration cells were formed during the exposure period. In these cases, the susceptibility to pitting was not attributed to aggressive basin water chemistry but to localized conditions (intentional crevices ... continued below

Creation Information

VORMELKER, P September 5, 2005.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Titles

  • Main Title: FY2004 CORROSION SURVEILLANCE RESULTS FOR L-BASIN
  • Series Title: Fiscal Year 2004

Description

This report documents the results of the L-Basin Corrosion Surveillance Program for the fiscal year 2004. Test coupons were removed from the basin on February 12, 2004, shipped to Savannah River National Laboratory (SRNL), and visually examined in a contaminated laboratory hood. Selected coupons were metallurgically characterized to establish the extent of general corrosion and pitting. Pitting was observed on galvanically coupled and on intentionally creviced coupons, thus demonstrating that localized concentration cells were formed during the exposure period. In these cases, the susceptibility to pitting was not attributed to aggressive basin water chemistry but to localized conditions (intentional crevices and galvanic coupling) that allowed the development of oxygen and/or metal ion concentration cells that produced locally aggressive waters. General oxidation was also observed on all of the coupons with localized corrosion observed on some of the coupons. These coupons were not pretreated to produce a protective oxide layer prior to exposure in the basin water. Non-protected coupons are more susceptible to corrosion than fuel cladding which has developed a protective oxide layer from high temperature reactor operations. However, the oxide on spent nuclear fuel (SNF) stored in L-Basin is not necessarily in pristine condition. Some of the oxide may have spalled off or been mechanically damaged prior to arrival at SRS. These areas on the fuel cladding would have the same susceptibility to corrosion as the coupons. Current observations from the test coupons demonstrate that, even with rigorously controlled basin water chemistry, localized aggressive conditions can develop in intentional crevice and galvanic samples. These results do illustrate the potential for corrosion induced degradation and thus the importance of a routine surveillance program similar to that conducted on the Uruguay fuel and on the surveillance coupons stored in L-Basin and future in-service inspections proposed for additional SNF in L-Basin. The 2004 results are compared to previous results on coupons removed from SRS basins in fiscal years 2001, 2002 and 2003. The extent of corrosion is correlated with sample and storage conditions as well as the water chemistry during the storage period. Coupon weight gains from 2004 coupons are similar to those from 2003. Oxides were removed from furniture rack coupons from 2003 and 2004 and comparable pit depths were found in the filler metal. Corrosion induced-degradation of the spent nuclear fuels stored in L-Basin could potentially impact the storage process by causing cladding penetration, exposing fuel core material, and allowing release of radionuclides to the basin waters. Such releases could potentially lead to high water activity levels which could impact fuel integrity and present problems in future fuel handling and transfer operations. However, the collective results (to date) of the coupon and water chemistry evaluations and Uruguay spent fuel inspections indicate that the fuel in the SRS storage basins has not experienced corrosion-induced degradation that will limit the time for interim storage in the basin waters. Continued surveillance and inspection is essential due to the potential for corrosion induced degradation. The next withdrawal of surveillance coupons from L-Basin occurred on March 29, 2005.

Notes

available

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: WSRC-TR-2005-00067
  • Grant Number: DE-AC09-96SR18500
  • DOI: 10.2172/890163 | External Link
  • Office of Scientific & Technical Information Report Number: 890163
  • Archival Resource Key: ark:/67531/metadc883818

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • September 5, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

Description Last Updated

  • Nov. 2, 2016, 1:37 p.m.

Usage Statistics

When was this report last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

VORMELKER, P. FY2004 CORROSION SURVEILLANCE RESULTS FOR L-BASIN, report, September 5, 2005; [Aiken, South Carolina]. (digital.library.unt.edu/ark:/67531/metadc883818/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.