Document: NUREG-0800
Document ID: bfe08773-10ce-45c6-9767-3cbe51c1726f
Document Type: srp
Title: - 12.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070720019.pdf
Revision Date: 2023-06
Chapter: 12
Section ID: 12.3
CFR Part: 
CFR Title: 

Content:
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 II.F.1; and Regulatory Guide 1.97, Revision 3. 12.3-12.4-13 Revision 3 - March 2007 ii. Portable instruments to be used in the event of an accident should be placed so as to be readily available to personnel responding to an emergency. iii. Emergency power should be provided for installed accident monitoring systems. iv. The accident monitoring systems should have usable ranges that include the maximum calculated accident levels and should be designed to operate properly in the environment caused by the accident. v. Two high-range radiation monitors are provided in containment in accordance with the requirements of 10 CFR 50.34(f)(2)(xvii) and item II.F.1 of NUREG-0737. D. Appendix A to Regulatory Guide 1.21 provides useful guidance about effluent monitoring that applies to the acceptability of in-plant airborne radioactivity