More than 100 years ago, scientistsdiscovered that many elements com-monly found on earth occur in differ-ent atomic configurations. These vary-ing configurations, called isotopes, were found to have identical electroni-cally charged particles and identicalchemical properties, but differentatomic weights and physical properties

The National Academy of Sciences' Committee on Technical Bases for Yucca Mountain Standards recommended that standards for the disposal of high-level radioactive waste at Yucca Mountain should 1. set a limit on the risk of individuals, 2. use the critical group approach, as defined by the international Commission on Radiological Protection; 3. define the critical group using present knowledge and cautious, reasonable assumptions; 4. use a time period for conducting compliance assessment that includes the period of greatest risk; and 5. use a stylized calculation to assess whether the...

This report describes the most recent version of a second-generation human reliability analysis method called "A Technique for Human Event Analysis," NUREG-1625, Rev..1. ATHENA is a result of development efforts sponsored by the Probabilistic Risk Analysis Branch in the U.S. Nuclear Regulatory Commissions's Office of Nuclear Regulatory Research.

This document, NUREG 1736, "Consolidated Guidance: 10 CFR Part 20 Standards for Protection Against Radiation," consolidates guidance into a single comprehensive source by referee to numerous guidance documents.

On June 28, 1991, the U.S. Nuclear Regulatory Commission issued Supplement 4 to Generic Letter "Individual Plant Examination of External Events for Severe Accident Vulnerabilities, 10 CFR 50.54," and NUREG-1407, "Procedure and Submittal Guidance for the Individual Plant Examination of External Events for Severe Accident Vulnerabilities."

This document is a safety evaluation report regarding the application to renew the operating license for Arkansas Nuclear One, Unit 1, while was filed by Entergy Operations Inc., by letter dated January 31, 2000.

This technical reference document was developed in the International Collaborative Project to Evaluate Fire Models for nuclear Power Plant Applications.

The purpose of this report is to present the results of the Phase 1 development of risk-based performance indicators to potentially enhance the Reactor Oversight Process.

This document is a safety evaluation report regarding the application to renew the operating licenses for Turkey Point Nuclear Plant, Units 3 and 4, which was filled but he Florida power and Light Company by letter Dated September 2000, and received by the U.S. Nuclear Regulation Commission on September 11, 2000.

The safety evaluation report documents the Nuclear Regulatory Commission's review of Virginia Electric and Power Company's applications to renew the operating licenses for North Anna Power Stations, Units 1 and 2, and Surry Power Station, Units 1 and 2.