scholarly journals System Definition Document: Reactor Data Necessary for Modeling Plutonium Disposition in Catawba Nuclear Station Units 1 and 2

2000 ◽  
Author(s):  
R.J. Ellis
Keyword(s):  
Nuclear Station

Fukushima Two Year Processing Update

2013 ◽  
Author(s):  
Mark S. Denton ◽  
Josh Mertz
Keyword(s):  
Natural Environment ◽  
Earth Quake ◽  
New Technology ◽  
Lessons Learned ◽  
Surrounding Area ◽  
Radioactive Materials ◽  
Nuclear Station ◽  
Fukushima Daiichi ◽  
Perfect Storm

On March 11, 2011, now two years ago, the magnitude 9.0 Great East Japan earth quake, Tohoku, hit off the Fukushima coast of Japan. This was one of the most powerful earthquakes in recorded history and the most powerful one known to have hit Japan. The ensuing tsunami devastated a huge area resulting in some 25,000 persons confirmed dead or missing. The perfect storm was complete when the tsunami then found the four-reactor, Fukushima-Daiichi Nuclear Station directly in its destructive path. Some 2 million people were evacuated from a fifty mile radius of the area and evaluation and cleanup began. A tremendous effort has been made, by many nationalities, since this time to restore this damaged plant and surrounding area and to return a great deal of the residents to their homes and farm lands. While most of the outcome of this unprecedented natural and manmade disaster was negative, both in Japan and worldwide, there have been some extremely valuable lessons learned and new emergency recovery technologies and systems developed to cope with the aftermath of this disaster. This paper describes new technology developed to selectively remove radioactive materials dangerous to workers, local citizens, and the natural environment from seawater used to cool the damaged reactors at Fukushima. As always, the mother of invention is necessity.

Technical Challenges of Retubing the E´lectricite´ de France (EDF) Belleville Unit 2

2011 ◽  
Author(s):  
Merwin W. Jones ◽  
Kim M. Massey ◽  
David Voisin
Keyword(s):  
Leak Test ◽  
Brass Alloy ◽  
Steel Tubes ◽  
Laser Alignment ◽  
Alignment System ◽  
Leak Testing ◽  
Nuclear Station ◽  
Surface Condenser ◽  
Rolling Torque ◽  
Station Unit

This paper describes the numerous challenges involved in the partial retubing of the Belleville Nuclear Station Unit 2 steam surface condenser using 64,242 tubes. Specific challenges of the project included retubing with both duplex stainless steel tubes and with brass alloy tubes, analyzing the risk of flow induced tube vibration and designing a staking system to prevent such vibration, and, replacement of six tubesheets. The tubesheet stresses were analyzed using a beam strip analysis and ANSYS, and new tubesheets were reverse engineered from original drawings. Tubesheets were aligned to the support plate holes using a newly developed laser alignment system. Prior to the retubing, extensive mockup tests were performed to optimize the rolling torque, and to determine rolling parameters that limit the work-hardening of the brass tubes. Testing also included leak testing the mockup joints with a small pressure vessel and then performing a helium leak test of the pressurized tube joints. Tests were performed with both smooth and serrated holes.

The NUREG-1150 probabilistic risk assessment for the Grand Gulf Nuclear Station

1992 ◽  
Vol 135 (1) ◽  
pp. 117-137 ◽  
Author(s):  
T.D. Brown ◽  
R.J. Breeding ◽  
J.C. Helton ◽  
H.N. Jow ◽  
S.J. Higgins ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Probabilistic Risk Assessment ◽  
Nuclear Station ◽  
Probabilistic Risk
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