FAQ
AGREEMENT STATES
Facility Locator
What's New
Site Help
Index A-Z
Contact Us
Email Updates
Report a Safety Concern
Search
Nuclear Reactors
Power Reactors
Research & Test Reactors
Operating Reactors
New Reactors
Operator Licensing
Research Activities
Nuclear Reactor Quick Links
Nuclear Materials
Types of Nuclear Materials
Fuel Cycle Facilities
Medical, Industrial, & Academic Uses
Uranium Recovery
Materials Transportation
Materials Environmental Reviews
National Materials Program
Nuclear Materials Quick Links
Radioactive Waste
Decommissioning of Nuclear Facilities
Low-Level Waste
Waste Incidental to Reprocessing
High-Level Waste
Uranium Mill Tailings
Low-Level Waste Disposal
High-Level Waste Disposal
Storage of Spent Nuclear Fuel
Transportation of Spent Nuclear Fuel
Research Activities
Radioactive Waste Quick Links
Nuclear Security
Domestic Safeguards
Information Security
Radioactive Material Security
Required Reporting for Clearance Holders
Insider Threat Program for Licensees
Cybersecurity
Criminal History & Firearms Checks
Contact Us
Public Meetings & Involvement
The NRC Approach to Open Government
About Meetings Open to the Public
Conferences & Symposia
Documents for Comment
NRC Rules and Petitions
Facilitating Stakeholder Involvement
NRC Information Quality Guidelines
Subscribe to E-mail Updates
Commission Schedule
Public Meeting Schedule
Adjudications (Hearings)
Adjudicatory Submissions
NRC Library
Basic References
Document Collections
ADAMS Public Documents
Public Document Room
LSN Library
FOIA & Privacy Act
Photos & Videos
Records Management
Training Courses
FAQ Index
Get Copies of Documents
Withholding of Sensitive Information
Controlled Unclassified Information Program (CUI)
Electronic Hearing Docket
About NRC
The Commission
Organization & Functions
Governing Legislation
Plans, Budget, & Performance
Locations
History
Values
Direction-Setting & Policymaking
Research Activities
Radiation Protection
Fire Protection
Safety Culture
How We Regulate
Emergency Preparedness & Response
Public Affairs
Congressional Affairs
Enforcement
International Programs
State & Tribal Programs
Alternative Dispute Resolution Programs
Privacy Program
Civil Rights Program
Contact Us
Career Opportunities
Contracting Opportunities
Small Businesses
Grant Opportunities
Generic Schedules
Other Links
FAQ
Glossary
Facility Locator
What's New
Site Help
Index A-Z
Contact Us
Email Updates
NRC Facebook
NRC Twitter Feed
NRC Linkedin
NRC Youtube Channel
NRC Flickr Gallery
NRC Blog Archived
NRC Email Subscriptions - GovDelivery
Home
NRC Library
Basic References
Glossary
Probability distribution
A mathematical characterization of uncertainty. Examples include normal, lognormal, and uniform.
Page Last Reviewed/Updated Tuesday, March 23, 2021