Document: NRC Regulatory Guide
Document ID: de79d411-4fc9-456e-a5a0-f4a910ca4c9a
Document Type: regulatory_guide
Title: Assumptions Used for Evaluating a Control Rod Ejection Accident for Pressurized Water Reactors (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2111/ML21119A157.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.77
CFR Part: 
CFR Title: 

Content:
such that operators can begin using the apparatus within 2 minutes after detection of a hazardous release. Breathing apparatus, air supply equipment, and protective clothing should meet the criterion that a single toxic gas event would not render nonfunctional the total inventory of such protective equipment. 4.4 PPE Training Control room operators should train and have the ability to don a respirator and associated PPE within 2 minutes. The interpretation of IDLH value is considered appropriate since it provides an adequate margin of safety as long as CR operators use protective measures within 2 minutes after detection of hazardous chemicals. 5. EMERGENCY PLANNING The licensee should initiate CR emergency procedures as described in NUREG-0696, “Functional Criteria for Emergency Response Facilities, Office of Inspection and Enforcement,” issued February 1981 (Ref. 24), if a hazardous chemical release occurs within or near the plant. These procedures should address both ACA and MCA and should identify the most probable chemical releases at the station. The procedures should discuss methods of detecting the event by station personnel, both during normal workday operation and during minimum staffing periods (e.g., late night and weekend shift staffing). Special instrumentation provided for the detection of hazardous chemical releases should be described, including the action initiated by the detecting instrument and the level at which this action is initiated. The emergency procedures should describe the isolation of the CR, the use of protective breathing apparatus or other protective measures, and maintenance of the plant in a safe condition, including the capability for an orderly shutdown or scram. Finally, the procedure should describe criteria and procedures for evacuating nonessential personnel from the station. Emergency planning should include training emergency planning personnel on the use of instruments. It should also include periodic drills on the