Document: NUREG-0800
Document ID: 3c241845-034f-4f89-b12a-f51967895c13
Document Type: srp
Title: PROCESS AND EFFLUENT RADIOLOGICAL MONITORING INSTRUMENTATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1307/ML13071A494.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.5
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Content:
asurement methods relying on the use of surrogate radionuclides, as easy-to-detect, in accounting for the presence of hard-to-detect radionuclides when not specifically analyzed or monitored. R1 - For instrumentation used to comply with TS on reactor coolant pressure boundary (RCPB) or steam generator (SG) tube leakage rates, the basis of the placement of the radiation detectors on system piping and components and detection sensitivity of the radiation monitoring system should be described and specify which radionuclides are used to demonstrate conformance with the TS. 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 RETS/SREC and ODCM using NRC guidance. This provision applies to liquid and gaseous process radiation monitoring equipment not covered by the ODCM, including information describing a plant-specific process, TS for RCPB and SG tube leakage rates, and radiological sampling and analysis plan for systems not covered by the ODCM. ( ) - Monitoring or sampling provisions indicated within parentheses are required only for systems not monitored, sampled, or analyzed (as indicated) prior to release. 11.5-54 Draft Revision 6 – August 2014 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