Document: NRC Regulatory Guide
Document ID: ceaeb6d7-d85a-46d3-a1b6-70059a498965
Document Type: regulatory_guide
Title: 12/2001 (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0131/ML013100014.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.78
CFR Part: 
CFR Title: 

Content:
eptable design features and procedures for the protection of nuclear power plant control room operators against an accidental onsite chlorine release, and outlined emergency procedures that need to be initiated in the event of a chlorine release. 1.78-2 This Revision 1 of Regulatory Guide 1.78 incorporates and withdraws Regulatory Guide 1.95 since many regulatory positions in these two guides are the same or similar. This revision also updates certain regulatory positions based on more current knowledge of the subject. This guide does not consider the explosion hazard of these chemicals, which is addressed separately in Regulatory Guide 1.91, “Evaluations of Explosions Postulated To Occur on Transportation Routes Near Nuclear Power Plants” (Ref. 1), nor does it address flammability hazards, which are addressed separately in Regulatory Guide 1.189, “Fire Protection for Operating Nuclear Power Plants” (Ref. 2). The information collections contained in this regulatory guide are covered by the requirements of 10 CFR Part 50, which were approved by the Office of Management and Budget, approval number 3150-0011. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection. B. DISCUSSION The control room of a nuclear power plant should be appropriately protected from hazardous chemicals that may be discharged as a result of equipment failures, human errors, or events and conditions outside the control of the nuclear power plant. Sources of hazardous chemicals could be mobile or stationary and could include storage tanks, pipelines, fire-fighting equipment, tank trucks, railroad cars, and barges. This guide has been revised to provide guidance on control room habitability during a postulated hazardous chemical release, including chlorine. The guide describes assumptions and criteria for screening out release events