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ASTM C 1562 Document Information:
Title
Standard Guide for Evaluation of Materials Used in Extended Service of Interim Spent Nuclear Fuel Dry Storage Systems
ASTM International
Publication Date:
Feb 10, 2003
Scope:
Part of the total inventory of commercial spent nuclear fuel
(SNF) is stored in dry cask storage systems (DCSS) under licenses
granted by the U.S. Nuclear Regulatory Commission (NRC). The
purpose of this guide is to provide information to assist in
supporting the renewal of these licenses, safely and without
removal of the SNF from its licensed confinement, for periods
beyond those governed by the term of the original license. This
guide provides information on materials behavior under conditions
that may be important to safety evaluations for the extended
service of the renewal period. This guide is written for DCSS
containing light water reactor (LWR) fuel that is clad in zirconium
alloy material and stored in accordance with the Code of Federal
Regulations (CFR), at an independent spent-fuel storage
installation (ISFSI).2 The components of an ISFSI,
addressed in this document, include the commercial SNF, canister,
cask, and all parts of the storage installation including the ISFSI
pad. The language of this guide is based, in part, on the
requirements for a dry SNF storage license that is granted, by the
U.S. Nuclear Regulatory Commission (NRC), for up to 20 years.
Although government regulations may differ for various nations, the
guidance on materials properties and behavior given here is
expected to have broad applicability.
This guide addresses many of the factors affecting the
time-dependent behavior of materials under ISFSI service [10 CFR
Part 72.42]. These factors are those regarded to be important to
performance, in license extension, beyond the currently licensed
20-year period. Examples of these factors are given in this guide
and they include materials alterations or environmental conditions
for components of an ISFSI system that, over time, could have
significance related to safety. For purposes of this guide, a
license period of an additional 20 to 80 years is assumed.
This guide addresses the determination of the conditions of the
spent fuel and storage cask materials at the end of the initial
20-year license period as the result of normal events and
conditions. However, the guide also addresses the analysis of
potential spent fuel and cask materials degradation as the result
of off-normal, and accident-level events and conditions that may
occur during any period.
This guide provides information on materials behavior to support
continuing compliance with the safety criteria, which are part of
the regulatory basis, for licensed storage of SNF at an ISFSI. The
safety functions addressed and discussed in this standard guide
include thermal performance, radiological protection, confinement,
sub-criticality, and retrievability. The regulatory basis includes
10 CFR Part 72 and supporting regulatory guides of the U.S. Nuclear
Regulatory Commission. The requirements set forth in these
documents indicate that the following items were considered in the
original licensing decisions: properties of materials, design
considerations for normal and off-normal service, operational and
natural events, and the bases for the original calculations. These
items may require reconsideration of the safety-related arguments
that demonstrate how the systems continue to satisfy the regulatory
requirements. Further, to ensure continued safe operation, the
performance of materials must be justified in relation to the
effects of time, temperature, radiation field, and environmental
conditions of normal and off-normal service. Arguments for
long-term performance must account for materials alterations
(especially degradations) that are expected during the service
periods, which include the periods of the initial license and of
the license renewal. This guide pertains only to structures,
systems, and components important to safety during extended storage
period and during retrieval functions, including transport and
transfer operations. Materials information that pertains to safety
functions, including retrieval functions, is pertinent to current
regulations and to license renewal process, and this information is
the focus of the guide. This guide is not intended to supplant the
existing regulatory process.
2 In general fuels of higher burnup (>45 MWd/kgU)
and MOX fuels are not included in this guide. Guidance for these
fuels are expected to be included in an Annex to be written
later.
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