Regulatory Guide 8.5

Immediate Evacuation Signal

ML13350A230
Person / Time
Issue date:	02/16/1973
From:	US Atomic Energy Commission (AEC)
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References
RG-8.005
Download: ML13350A230 (1)

U 5 .--2/16/73U.S. ATOMIC ENERGY COMMISSIONREGULATORYDIRECTORATE OF REGULATORY STANDARDSREGULATORY GUIDE 8.5IMMEDIATE EVACUATION SIGNALGUIDEA. INTRODUCTIONSection 70.24 of 10 CFR Part 70 requires criticalitydetection and alarm systems in any area containingspecial nuclear material when the licensee is authorizedto possess more than 500 grams of U-235, 300 grams ofPu, or 300 grams of U-233. This guide defines thecharacteristics of an acceptable audible alarm for use inthis and other instances where prompt, completeevacuation is required to prevent serious injury fromradiation exposure.B. DISCUSSIONUnited States of America Standards InstituteSubcommittee N2.1, Ionizing Radiation Symbols, ColorCodes and other Identifying or Warning Devices,prepared standard N2.3-19671 which was approved bythe United States of America Standards Institute on'The United States of America Standards Institute becamethe American National Standards Institute, Inc., in 1969. Copiesof ANSI N2.3-1967 may be obtained from the AmericanNational Standards Institute, Inc., 1430 Broadway, New York,New York 10018.October .3, 1967. The standard defines thecharacteristics of an immediate evacuation alarm systcm.C. REGULATORY POSITIONThe characteristics of an immediate evacuationsignal described in ANSI N2.3.1967, "ImmediateEvacuation Signal for Use in Industrial InstallationsWhere Radiation Exposure May Occur," are generallyacceptable for use wherever such a system may beneeded or required, subject to the following:1. The minimum duration of the signal should besufficient to ensure evacuation and permitimplementation of access control.2. Within a given facility or plant, the unique signaldescribed in N2.3-1967 should be consistent if used inmore than one location.3. In some cases, plant design features or operatingconditions may require alarms different from thatdescribed in the standard. This determination will bemade on an individual basis.USAEC REGULATORY GUIDES Copies of published guide-- may be obtained by rerust Indicating the divisionsdesired to the US. Atomic Energy Commission, Washlngton, D.C. 20545,Rogulatory Guidue are issued to describe Snd mtkre available to the public Atltetion: Director of Regulatory Standards. Comments arid suggestiornt fOrmethods acceptable to the AEC Regulatory staff of implementing Stcilsic Patis of .Imptovementl In these guidet ate Icourrd anid IhouJld be Sin to the secretarythe Commissions regulations, to delineate teoniques used by the stall in of the Commission. US. Atomic Energy Commission. Washington, D.C. 20545.evaluating Specific probltms or postulated accidents. or to provide guidance to Attention: Chief. Public Proceedings Stiff.applicannt. Regulatory Outdes not substitutas for regulationt and compliencewith them is not requited. Methods and tolutlons dilferent from those set out in The guides are issued in the tollowing ten broad divisions:the quides will be ecseptabta if they provide a basis for the findings requisite Toth isunc r oninaceofa mf t icne y heCmmsson .Power fReactor% 6. Ptoducls2. Reseach and Test Reactors 7. TranspOrtation .3. Fuels and Materials Faclities I. HeAlthPubhished guides will be revised permodireliv. 4%aop~oriate. to accommodate 4. Envw.onrnmentel arni Sittrg 9. Antitrust Rewevstcomments and to reflect newniorrmlatiOn Of eCPeiti¶ce. 51. maletoils ansm Plant Protection 10. Genetal