Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A new keyword search will reset all filters below. You can further limit keyword search results with tags.

U.S. NRC Nuclear Regulatory Commission

Search Results

A new keyword search will reset all filters below. You can further limit keyword search results with tags.

Facilities & Safety

NRC oversees the safety of nuclear reactors, materials, and waste facilities nationwide.
Reactors, Facilities, Sites
Safety & Security
Radiation & Waste
Protection
- Radiation Protection
- Fire Protection
Regulations & Legislation

Covers the laws establishing the NRC, its 10 CFR regulations, and the rulemaking process, including petitions, public comment, and Federal Register notices.
Regulations
- How We Regulate
- Regulations (NRC, 10 CFR)
Legislation
Rulemaking
Guidance
- Regulatory Guides (by Division)
Documents & Reports

Access NRC reports, ADAMS documents, Commission communications, data and research tools, plus forms, public submissions, and comment periods.
Reports
Communications
- Congressional Documents
- Generic Communications
Data & Tools
Forms & Submissions
- Forms (NRC)
- Petition for Rulemaking Dockets
Documents
Search ADAMS NRC's public document library
Licensing & Applications

Covers NRC's licensing process for facilities, materials, and reactor operators, plus tools for tracking, submitting, and reviewing applications.
Facility Licensing
Operator Licensing
Materials Licensing
- Licensing
- Materials License Process
Tools
Education & Regulatory Research

Explore NRC's regulatory research programs, staff training and apprenticeship pathways, and public education resources on nuclear science.
Regulatory Research
- Research Activities
Training & Development
- Nuclear Regulator Apprenticeship Network
- Technical Training
Education
Public Meetings & Hearings

Find NRC's public meeting schedules, adjudicatory hearings, meeting archives, and conferences such as the RIC and RAMP events.
Meetings
Conferences
- Conferences & Symposia
About NRC

Learn about NRC's leadership, priorities, and news, how to work with or contact the agency, and key legal and privacy resources.
About NRC
Get Involved
Resources

- Facilities & Safety
  
  NRC oversees the safety of nuclear reactors, materials, and waste facilities nationwide.
- Reactors, Facilities, Sites
- Safety & Security
- Radiation & Waste
- Protection
  - Radiation Protection
  - Fire Protection
- Documents & Reports
  
  Access NRC reports, ADAMS documents, Commission communications, data and research tools, plus forms, public submissions, and comment periods.
- Reports
- Communications
  - Congressional Documents
  - Generic Communications
- Data & Tools
- Forms & Submissions
  - Forms (NRC)
  - Petition for Rulemaking Dockets
- Documents
  Search ADAMS NRC's public document library
- Education & Regulatory Research
  
  Explore NRC's regulatory research programs, staff training and apprenticeship pathways, and public education resources on nuclear science.
- Regulatory Research
  - Research Activities
- Training & Development
  - Nuclear Regulator Apprenticeship Network
  - Technical Training
- Education

Breadcrumb

Home
Education & Regulatory Research
Glossary
Light water

Light water

Glossary
Light water

Ordinary water as distinguished from heavy water.

Page Last Reviewed/Updated Monday, September 14, 2026

Nuclear Regulatory Commission

Contact Us

301-415-7000

OPA.resource@nrc.gov

To report a safety concern, call 301-816-5100

About Us

License Fees
Budget & Performance
Agency Financial Report
History of the NRC
Career Opportunities
NRC Ethics
Agency Status
Contact Us
Strategic Plan

Resources

Regulations.gov
USA.gov
FOIA
Whistleblower Protection
No Fear Act Data
Inspector General
Accessibility
Privacy Policy
Site Disclaimer
For Employees