Brief account of the effect of overcooling accidents on the integrity of PWR pressure vessels Page: 1 of 20
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
^ 5-0 3> Q-* I ■' Q- -ST
A BRIEF ACCOUNT OF THE EFFECT OF OVERCOOLING ACCIDENTS
ON THE INTEGRITY OF PWR PRESSURE VESSELS*
R. D. Cheverton
Oak Ridge National Laboratory
Oak Ridge, Tennessee 37830
The occurrence in recent years of several pressurized water reactor
(PWR) accident initiating events that could lead to severe thermal shock
to the reactor pressure vessel, and the growing awarness that copper and
nickel in the vessel material significantly enhance radiation damage in
the vessel, have resulted in a reevaluation of pressure-vessel integrity
during postulated overcooling accidents. Analyses indicate that the
accidents of concern are those involving both thermal shock and pressure
loadings, and that an accident similar to that at Rancho Seco in 1978
could, under some circumstances and at a time late in the normal life of
the vessel, result in propagation of preexistent flaws in the vessel wall
to the extent that they might completely penetrate the wall. More severe
accidents have been postulated that would result in even shorter per-
missible lifetimes. However, the state-of-the-art fracture-mechanics
analysis may contain excessive conservatism, and this possibility is
being investigated. Furthermore, there are several remedial measures,
such as fuel shuffling, to reduce the damage rate, and vessel annealing,
to restore favorable material properties, that may be practical and used
This report was prepared as on occount of work sponsored by an agency of the United States Government
Neither the United States Government nor any agency thereof, nor any of their employees, makes any
warranty, express or implied, or assumes any legal liability or responsibility for the occuracy,
completeness, or usefulness "I any information, apparatus, product, or process disclosed, or
represents that it, use would rot infringe privately owned rights. Reference herein to any specific
commercial product, proccis, or servioe by trade name, trademark, manufacturer, or otherwise, does
not necessarily constitute or imply its endorsement, recommendation, or favoring by the United
States Government or any agency thereof Tha views and opinions of authors expressed herein do not
necessarily state c reflect those of the United States Government or any agency thereof.
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Cheverton, R.D. Brief account of the effect of overcooling accidents on the integrity of PWR pressure vessels, article, January 1, 1982; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1074282/m1/1/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.