Document: 10 CFR Part 50
Document ID: d0ed3b22-f5a8-42b0-8cac-2e9eadacfdb8
Document Type: cfr
Title: Contents of applications; technical information.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.34
Revision Date: 
Chapter: 
Section ID: 50.34
CFR Part: 50
CFR Title: 10

Content:
he containment isolation system, ( B ) For each non-essential penetration (except instrument lines) have two isolation barriers in series, ( C ) Do not result in reopening of the containment isolation valves on resetting of the isolation signal, ( D ) Utilize a containment set point pressure for initiating containment isolation as low as is compatible with normal operation, ( E ) Include automatic closing on a high radiation signal for all systems that provide a path to the environs. ( xv ) Provide a capability for containment purging/venting designed to minimize the purging time consistent with ALARA principles for occupational exposure. Provide and demonstrate high assurance that the purge system will reliably isolate under accident conditions. (II.E.4.4) ( xvi ) Establish a design criterion for the allowable number of actuation cycles of the emergency core cooling system and reactor protection system consistent with the expected occurrence rates of severe overcooling events (considering both anticipated transients and accidents). (Applicable to B&W designs only). (II.E.5.1) ( xvii ) Provide instrumentation to measure, record and readout in the control room: ( A ) containment pressure, ( B ) containment water level, ( C ) containment hydrogen concentration, ( D ) containment radiation intensity (high level), and ( E ) noble gas effluents at all potential, accident release points. Provide for continuous sampling of radioactive iodines and particulates in gaseous effluents from all potential accident release points, and for onsite capability to analyze and measure these samples. (II.F.1) ( xviii ) Provide instruments that provide in the control room an unambiguous indication of inadequate core cooling, such as primary coolant saturation meters in PWR's, and a suitable combination of signals from indicators of coolant level in the reactor vessel and in-core thermocouples in PWR's and BWR's. (II.F.2) ( xix ) Provide instrumentation adequate for monitoring plant