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  • ASTM
    C1751-11 Standard Guide for Sampling Radioactive Tank Waste
    Edition: 2011
    $93.60
    Unlimited Users per year

Description of ASTM-C1751 2011

ASTM C1751 - 11

Standard Guide for Sampling Radioactive Tank Waste

Active Standard ASTM C1751 | Developed by Subcommittee: C26.13

Book of Standards Volume: 12.01




ASTM C1751

Significance and Use

Obtaining samples of high-level waste created during the reprocessing of spent nuclear fuels presents unique challenges. Generally, high-level waste is stored in tanks with limited access to decrease the potential for radiation exposure to personnel. Samples must be obtained remotely because of the high radiation dose from the bulk material and the samples; samples require shielding for handling, transport, and storage. The quantity of sample that can be obtained and transported is small due to the hazardous nature of the samples as well as their high radiation dose.

Many high-level wastes have been treated to remove strontium (Sr) or cesium (Cs), or both, underwent liquid volume reductions through forced evaporation or have been pH modified, or both, to decrease corrosion of the tanks. These processes, as well as waste streams added from multiple process plant operations, often resulted in precipitation, and produced multiphase wastes that are heterogeneous. Evaporation of water from waste with significant dissolved salts concentrations has occurred in some tanks due to the high heat load associated with the high-level waste and by intentional evaporative processing, resulting in the formation of a saltcake or crusts, or both. Organic layers exist in some waste tanks, creating additional heterogeneity in the wastes.

Due to these extraordinary challenges, substantial effort in research and development has been expended to develop techniques to provide grab samples of the contents of the high-level waste tanks. A summary of the primary techniques used to obtain samples from high-level waste tanks is provided in Table 1. These techniques will be summarized in this guideline with the assumption that the tank headspace is adequately ventilated during sampling.

TABLE 1 High-Level Waste Tank Sampling Methods

Technique Material Type Notes
Solid Slurry Liquid
HAST in-tank
needle orifice





X

Orifice as part of Reverse-Flow
Diverter (RFD)

Bottle on a String



X

X

Dip sample

Vacuum Pump



X

X



Auger

X

X



Only high viscosity slurries

Sample Cup

X

X



Manual system used at
Savannah River Site to obtain
salt-cake samples and hard
sludges that don t slump.

Core Drilling
Rotary Mode
(Hanford Sampler)
X
X



Hard sludges and salt-cake.

Core Drilling
Push Mode
(ORNL Soft
Sludge Sampler)


X

X

Liquid or soft sludges.

Cylinder with
retractable
nose cone



X

X

Used at Savannah River Site
for soft sludges and liquids.

Robotic Arm

X

X

X

Material type captured is
dependent upon the end-
effector.

Hydraulic Mining

X

X

X



Hydraulic Scoop

X

X

X



Sample Thief
(Bacon Bomb)




X



1. Scope

1.1 This guide addresses techniques used to obtain grab samples from tanks containing high-level radioactive waste created during the reprocessing of spent nuclear fuels. Guidance on selecting appropriate sampling devices for waste covered by the Resource Conservation and Recovery Act (RCRA) is also provided by the United States Environmental Protection Agency (EPA) (1) . Vapor sampling of the head-space is not included in this guide because it does not significantly affect slurry retrieval, pipeline transport, plugging, or mixing.

1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1129 Terminology Relating to Water


Keywords

core sampling; high-level waste; radioactive waste; sampling tank waste; slurry sampling;


ICS Code

ICS Number Code 13.030.30 (Special wastes)


DOI: 10.1520/C1751-11

ASTM International is a member of CrossRef.

ASTM C1751

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