ML003739454

Rev 1 Criticality and Other Interior Evacuation Signals

ML003739454
Person / Time
Issue date:	03/31/1981
From:	Office of Nuclear Regulatory Research
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References
RG-8.5, Rev 1
Download: ML003739454 (2)

Text

Revision I

+,* . E*0*'March 1981 0,tof U.S. NUCLEAR REGULATORY COMMISSION

REGULATORY GUIDE OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 8.5 CRITICALITY AND OTHER INTERIOR EVACUATION SIGNALS A. INTRODUCTION conception, installation, and operation. A description of typical characteristics for an evacuation signal and the Section 70.24, "Criticality Accident Requirements," of signal generator that were included as requirements in the 10 CFR Part 70, "Domestic Licensing of Special Nuclear body of USASI N2.3-1967 have been placed in Appendix B Material." requires criticality detection and alarm systems to ANSI/ANS N2.3-1979 simply asan example of compliance in any area containing special nuclear material when the with the standard.

licensee is authorized to possess such special nuclear mate rial in excess of certain specified amounts. This guide defines the characteristics of an audible signal acceptable to the C. REGULATORY POSITION NRC staff for use where prompt, complete evacuation is required to prevent serious injury from radiation exposure. The characteristics of an immediate evacuation signal described in ANSI/ANS N2.3-1979, "Immediate Evacua B. DISCUSSION tion Signal for Use in Industrial Installations," are gen erally acceptable to the NRC staff for use wherever such ANSI/ANS N2.3-1979,1 "Immediate Evacuation Signal a system may be needed or required except that the mini for Use in Industrial Installations," which is a revision of mum duration of the signal should be sufficient to ensure USASI N2.3-1967, was approved by the American National evacuation and permit implementation of access control.

Standards Institute (ANSI) on September 13, 1979. The standard defines the characteristics of an immediate evacua tion signal system. D. IMPLEMENTATION Whereas USASI N2.3-1 967 specified the characteristics of The purpose of this section is to provide information to a unique audible signal for evacuation of the area potentially applicants and licensees regarding the NRC staff's plan for affected by the consequences of a nuclear criticality acci using this regulatory guide. This guide reflects practices dent. ANSI/ANS N 2.3-1979 presents the recognized desirable currently acceptable to the NRC staff. Except in those characteristics of signal systems and good practices in their cases in which the applicant or licensee proposes accept able alternative practices or methods for complying with specified portions of the Commission's regulations, the The substantial number of changes in this revision has made it practices or methods described herein will be used as a impractical to indicate them with lines in the margin.

basis for evaluating applications for licenses to possess ICopies may be obtained from the American Nuclear Society. special nuclear material in quantities subject to §70.24 5SS North Kensington Avenue, LaGrange Park, Illinois 60525. of 10 CFR Part 70.

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