Document: NRC Regulatory Guide
Document ID: 29acb072-d497-44e6-ac1c-a053c0a468a0
Document Type: regulatory_guide
Title: Meteorological Monitoring Programs for Nuclear Power Plants + HISTORY - HISTORY DG-1164 , Third Proposed Revision 1, published 10/2006 Draft ES 926-4 , Second Proposed Revision 1, entitled "Meteorological Measurement Program for Nuclear Power Plants," published 04/1986 Draft SS 926-4 , First Proposed Revision 1, entitled "Meteorological Programs In Support of Nuclear Power Plants," published 09/1980 Revision 0, entitled "Onsite Meteorological Programs," was issued as Safety Guide 23
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0625/ML062540408.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.23
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cy preparedness programs and other applications at power reactor sites. That original issuance is currently the official version of Regulatory Guide 1.23. However, the NRC issued a proposed Revision 1 to Regulatory Guide 1.23 for public comment in September 1980 in response to the accident at Three Mile Island. That first proposed Revision 1 to Regulatory Guide 1.23 contained “special considerations for emergency planning,” which included (1) provisions for remote interrogation of the meteorological system by the NRC and other emergency response organizations during emergency situations, and (2) a viable backup system to obtain real-time local meteorological data. Although the NRC never officially adopted its first proposed Revision 1 of Regulatory Guide 1.23, the agency issued a second proposed Revision 1 for public comment in April 1986. That second proposed Revision 1 endorsed, with some minor exceptions, the “Standard for Determining Meteorological Information at Nuclear Power Sites,” which the American National Standards Institute/American Nuclear Society (ANSI/ANS) promulgated as ANSI/ANS-2.5-1984. Although ANSI/ANS-2.5-1984 did not contain the “special considerations for emergency planning” included in the first proposed Revision 1 of Regulatory Guide 1.23, it did update other provisions of the earlier revision. Nonetheless, the NRC never officially adopted the second proposed Revision 1 of Regulatory Guide 1.23, and ANSI/ANS-2.5-1984 has since been withdrawn and is currently inactive. The agency has now drafted a third proposed Revision 1 of Regulatory Guide 1.23 to replace the original (and still official) version of Regulatory Guide 1.23. As such, Draft Regulatory Guide DG- 1164 clarifies regulatory requirements and updates regulatory guidance regarding the criteria for an onsite meteorological measurements program to collect the basic meteorological data needed to support plant licensing and operation. Compared to the original (and still