This report documents work performed under the sponsorship of the Kraftwerk Union in the Federal Republic of Germany. The information in this report has been provided to the USNRC under the terms of an information exchange agreement between the United States and the Federal Republic of Germany (Technical Exchange and Cooperation Arrangement Between the United States Nuclear Regulatory Commission and the Bundesminister Fuer Forschung und Technologie of the Federal Republic of Germany in the field of reactor safety research and development, April 30, 1981). The Kraftwerk Union has consented to the publication of this report as a USNRC document in order that it may receive the widest possible circulation among the reactor safety community. Neither the United States Government nor the Kraftwerk Union or any agency thereof, or any of their employees, makes any warranty, expressed or implied, or assumes any legal liability of responsibility for any third party's use, or the results of such use, of any information, apparatus, product or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights. V