Document: NUREG-0800
Document ID: 723c7d66-7b0b-443a-af9b-ec3026461a0c
Document Type: srp
Title: - 12.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1130/ML113081427.pdf
Revision Date: 2023-06
Chapter: 12
Section ID: 12.3
CFR Part: 
CFR Title: 

Content:
is initiated after a loss of offsite power. B. The airborne radioactivity monitoring system will be acceptable if it is consistent with the guidance on continuous air sampling in RG 8.25 and meets the following criteria: i. Engineering controls provide the principal protection against the intake of radioactive materials. ii. Air should be sampled at normally occupied locations where airborne radioactivity may exist, such as solid waste handling areas, spent fuel pools, reactor operating floors, and BWR turbine buildings. The monitoring system should be capable of detecting 10 DAC-hours of particulate and iodine radioactivity from any compartment that has a possibility of containing airborne radioactivity and that normally may be occupied by personnel, taking into account dilution in the ventilation system. Continuous monitoring of air being exhausted from locations within the facility during normal operation is an acceptable method. Noble gas monitors should be calibrated such that, when monitoring for 133Xe, the instrument response will determine concentrations accurately. iii. Representative air concentrations are measured at the detectors, which are located as close to the sampler intakes as possible. iv. Ventilation monitors are upstream of high-efficiency particulate air filters. v. The detectors are calibrated routinely and after any maintenance work is performed on the detector. vi. Each location has a local audible alarm and variable alarm set points. Monitors located in high noise areas should also have visual alarms. vii. Readout and annunciation are provided in the control room. viii. Emergency power is initiated after a loss of offsite power. C. The in-plant accident radiation monitoring systems will be acceptable if they meet the following criteria: i. Personnel have the capability to assess the radiation hazard in areas that may be accessed during the course of an accident, in accordance with the criteria of 10 CFR 50.34(f)(2)(xvii); NUREG-0737, Item