scholarly journals The role of thermal shock in cyclic oxidation

1980 ◽  
Vol 14 (4) ◽  
pp. 325-336 ◽  
Author(s):  
Carl E. Lowell ◽  
Daniel L. Deadmore
Keyword(s):  
Thermal Shock ◽  
Cyclic Oxidation

Effects of Cladding on Reactor Pressure Vessel Integrity Based on the Revised PTS Rule (10 CFR 50.61)

2009 ◽  
Author(s):  
Vikram Marthandam ◽  
Timothy J. Griesbach ◽  
Jack Spanner
Keyword(s):  
Thermal Shock ◽  
Pressure Vessel ◽  
Historical Perspective ◽  
Pressurized Thermal Shock ◽  
Asme Code ◽  
Potential Benefits ◽  
Vessel Integrity ◽  
Technical Basis ◽  
Reactor Pressure

This paper provides a historical perspective of the effects of cladding and the analyses techniques used to evaluate the integrity of an RPV subjected to pressurized thermal shock (PTS) transients. A summary of the specific requirements of the draft revised PTS rule (10 CFR 50.61) and the role of cladding in the evaluation of the RPV integrity under the revised PTS Rule are discussed in detail. The technical basis for the revision of the PTS Rule is based on two main criteria: (1) NDE requirements and (2) Calculation of RTMAX-X and ΔT30. NDE requirements of the Rule include performing volumetric inspections using procedures, equipment and personnel qualified under ASME Section XI, Appendix VIII. The flaw density limits specified in the new Rule are more restrictive than those stipulated by Section XI of the ASME Code. The licensee is required to demonstrate by performing analysis based on the flaw size and density inputs that the through wall cracking frequency does not exceed 1E−6 per reactor year. Based on the understanding of the requirements of the revised PTS Rule, there may be an increase in the effort needed by the utility to meet these requirements. The potential benefits of the Rule for extending vessel life may be very large, but there are also some risks in using the Rule if flaws are detected in or near the cladding. This paper summarizes the potential impacts on operating plants that choose to request relief from existing PTS Rules by implementing the new PTS Rule.

Role of fatigue in damage development of refractories under thermal shock loads of different intensity

2020 ◽  
Vol 46 (13) ◽  
pp. 20707-20716
Author(s):  
K. Andreev ◽  
B. Luchini ◽  
M.J. Rodrigues ◽  
J. Lino Alves
Keyword(s):  
Thermal Shock ◽  
Damage Development ◽  
Shock Loads

Isothermal and Cyclic Oxidation of Ti-6Al-4V Alloy

2016 ◽  
Vol 369 ◽  
pp. 99-103 ◽  
Author(s):  
Min Jung Kim ◽  
Poonam Yadav ◽  
Dong Bok Lee
Keyword(s):  
Thermal Shock ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Oxide Scales ◽  
Scale Spallation ◽  
Excessive Stress

The Ti-6Al-4V alloy was oxidized isothermally and cyclically in air, and its oxidation behavior was compared with that of Ti metal. The isothermal oxidation at 800°C indicated that Ti-6Al-4V and Ti oxidized fast almost linearly, and the oxide scales that formed on Ti-6Al-4V and Ti were non-adherent. The cyclic oxidation indicated that Ti-6Al-4V oxidized faster than Ti at 600°C, and serious scale spallation occurred in Ti-6Al-4V compared to Ti at 800°C. The oxide scales that formed on Ti-6Al-4V and Ti after cyclic oxidation at 800°C delaminated into several pieces owing to excessive stress aroused by the repetitive thermal shock.

The fate of garnet during (deep-seated) coseismic frictional heating: The role of thermal shock

Geology ◽  
2018 ◽  
Vol 46 (5) ◽  
pp. 471-474 ◽  
Author(s):  
Simone Papa ◽  
Giorgio Pennacchioni ◽  
Ross J. Angel ◽  
Manuele Faccenda
Keyword(s):  
Thermal Shock ◽  
Frictional Heating

The role of Dy doping on cyclic oxidation behavior of Al-Si coating on new Cobalt-based γ/γ′ superalloy

2021 ◽  
pp. 110077
Author(s):  
Kanglu Feng ◽  
Zheng Chen ◽  
Meifeng Li ◽  
Mingyue Chen ◽  
Chungen Zhou
Keyword(s):  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Dy Doping

Role of volatilization of molybdenum oxides during the cyclic oxidation of high-Mo containing Ni-based single crystal superalloys

2017 ◽  
Vol 129 ◽  
pp. 192-204 ◽  
Author(s):  
Lu Qin ◽  
Yanling Pei ◽  
Shusuo Li ◽  
Xinbao Zhao ◽  
Shengkai Gong ◽  
...  
Keyword(s):  
Single Crystal ◽  
Cyclic Oxidation ◽  
Molybdenum Oxides
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