Modeling of Zircaloy cladding primary creep during load drop and reversal

Ville Tulkki (Corresponding Author), Timo Ikonen

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Modeling fuel behavior requires an accurate description of the cladding stress response for both operational and safety considerations. The transient creep response of Zirconium alloys is commonly modeled using a strain hardening rule which is known to hold in cases with monotonously increasing stresses. However, the strain hardening rule is experimentally known to fail in scenarios such as load drop or reversal. In this paper we derive a simple and easily implementable set of rules for primary creep based on experimental results which contradict the strain hardening rule. The primary creep predicted by these rules is compared with data from published thermal creep experiments and Halden in-pile creep experiment IFA-585. The model thus created is shown to perform well in describing both transient stress scenarios with monotonously increasing stress and scenarios involving load drops and reversals.
Original languageEnglish
Pages (from-to)98 - 103
JournalJournal of Nuclear Materials
Volume445
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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Creep
strain hardening
Strain hardening
zirconium alloys
Zirconium alloys
piles
Piles
Loads (forces)
safety
Experiments

Cite this

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title = "Modeling of Zircaloy cladding primary creep during load drop and reversal",
abstract = "Modeling fuel behavior requires an accurate description of the cladding stress response for both operational and safety considerations. The transient creep response of Zirconium alloys is commonly modeled using a strain hardening rule which is known to hold in cases with monotonously increasing stresses. However, the strain hardening rule is experimentally known to fail in scenarios such as load drop or reversal. In this paper we derive a simple and easily implementable set of rules for primary creep based on experimental results which contradict the strain hardening rule. The primary creep predicted by these rules is compared with data from published thermal creep experiments and Halden in-pile creep experiment IFA-585. The model thus created is shown to perform well in describing both transient stress scenarios with monotonously increasing stress and scenarios involving load drops and reversals.",
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Modeling of Zircaloy cladding primary creep during load drop and reversal. / Tulkki, Ville (Corresponding Author); Ikonen, Timo.

In: Journal of Nuclear Materials, Vol. 445, 2014, p. 98 - 103.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modeling of Zircaloy cladding primary creep during load drop and reversal

AU - Tulkki, Ville

AU - Ikonen, Timo

PY - 2014

Y1 - 2014

N2 - Modeling fuel behavior requires an accurate description of the cladding stress response for both operational and safety considerations. The transient creep response of Zirconium alloys is commonly modeled using a strain hardening rule which is known to hold in cases with monotonously increasing stresses. However, the strain hardening rule is experimentally known to fail in scenarios such as load drop or reversal. In this paper we derive a simple and easily implementable set of rules for primary creep based on experimental results which contradict the strain hardening rule. The primary creep predicted by these rules is compared with data from published thermal creep experiments and Halden in-pile creep experiment IFA-585. The model thus created is shown to perform well in describing both transient stress scenarios with monotonously increasing stress and scenarios involving load drops and reversals.

AB - Modeling fuel behavior requires an accurate description of the cladding stress response for both operational and safety considerations. The transient creep response of Zirconium alloys is commonly modeled using a strain hardening rule which is known to hold in cases with monotonously increasing stresses. However, the strain hardening rule is experimentally known to fail in scenarios such as load drop or reversal. In this paper we derive a simple and easily implementable set of rules for primary creep based on experimental results which contradict the strain hardening rule. The primary creep predicted by these rules is compared with data from published thermal creep experiments and Halden in-pile creep experiment IFA-585. The model thus created is shown to perform well in describing both transient stress scenarios with monotonously increasing stress and scenarios involving load drops and reversals.

U2 - 10.1016/j.jnucmat.2013.10.053

DO - 10.1016/j.jnucmat.2013.10.053

M3 - Article

VL - 445

SP - 98

EP - 103

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -