U.S. Nuclear Regulatory Commission
Guidance on Test conditions for Activated Charcoal Using Methyl Iodide
Title: Guidance on Test conditions for Activated Charcoal
Using Methyl Iodide
See the letter from W. Gammill to F. D. Leckie (Nuclear
Containment Systems, Inc.) dated September 24, 1981.
Guidance was provided on test conditions for activated
charcoal using methyl iodide. Technically, the best
approach is to use ANSI N509-1980, since it is an update
and refers to the latest industry-approved test procedures.
Guidance was requested on Regulatory Guide 1.52 for used
carbon, as to the proper temperature, relative humidity and
the allowable percent penetration. NRC replied that plant
Technical Specifications are the over-riding and
controlling document. If the Technical Specifications list
specific conditions, the test must be performed under those
conditions. If some, but not all conditions are specified,
then the ASTM procedures in ASTM D3803-1979 "Standard Test
Methods for Radioiodine Testing of Nuclear-Grade Gas Phase
Adsorbents" should be used to satisfy the remaining
conditions. If the Technical Specifications refer to
Regulatory Guide 1.52, Revision 2, March 1978, then page 6
of the document provides the proper course of action.
Technically however, the best course of action is to follow
ANSI N509-1980, since it is an update and refers to the
latest industry approved test procedures (ASTM D3803-1979).
Regulatory references: ANSI N509-1980, ASTM D3803-1979,
Regulatory Guide 1.52, Technical Specifications
Subject codes: 5.4