Document: NUREG-0800
Document ID: 8536691d-4254-4c01-a5ec-aa9dee960958
Document Type: srp
Title: PROCESS AND EFFLUENT RADIOLOGICAL MONITORING INSTRUMENTATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740509.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.5
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CFR Title: 

Content:
discharge line by closing an isolation valve (see SRP Acceptance Criteria 3.D and 3.D). k - Sample point should be available to obtain grab samples for laboratory analyses as indicated by notations. l - Continuous sampler (see SRP Acceptance Criterion 1.B). m - The automatic control feature may be alternatively provided by a process continuous radiation monitor located at a point upstream of the systems’ effluent continuous radiation monitor. n - For BWRs only. P - Typical system names applicable to PWRs. B - Typical system names applicable to BWRs. 11.5-34 Revision 5 - May 2010 NG - Noble gas radioactivity. I - Iodine radioactivity, radioactivity of other radionuclides in particulate form, and alpha emitters. H3 - Tritium. R - Gross radioactivity (beta radiation, gamma radiation, or total beta plus gamma). S&A - Sampling and analysis of radionuclides, to include gross radioactivity, identification and concentration of principal or significant radionuclides, and concentration of alpha emitters, as defined in the SREC and ODCM using NRC guidance. ( ) - Monitoring or sampling provisions indicated within parentheses are required only for systems not monitored, sampled, or analyzed (as indicated) prior to release. 11.5-35 Revision 5 - May 2010 APPENDIX 11.5-A DESIGN GUIDANCE FOR RADIOLOGICAL EFFLUENT MONITORS PROVIDING SIGNALS FOR INITIATING TERMINATION OF FLOW OR OTHER MODIFICATION OF EFFLUENT STREAM PROPERTIES 1. Background The primary design function of a radiological effluent monitor is the detection and measurement of radioactive materials released in gaseous or liquid effluent streams of light-water-cooled nuclear power reactors. An additional design function of some monitors is to provide a signal to automatically terminate or otherwise modify the effluent stream. Examples of this function are the termination of exhaust airflow by closure of containment ventilation or purge isolation valves and diversion of building ventilation exhaust streams from an untreated