Document: NUREG-0800
Document ID: 9633fe22-df24-4eb8-ae45-d5bf4598a3d1
Document Type: srp
Title: MAIN CONDENSER EVACUATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350080.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.2
CFR Part: 
CFR Title: 

Content:
gulatory guides and industrial standard: 1. Regulatory Guide 1.26 as it relates to the quality group classification for the MCES that may contain radioactive materials, but are not part of the reactor coolant pressure boundary and are not important to safety. 2. Regulatory Guides 1.33 and 1.123 as they relate to the quality assurance programs for the MCES components that may contain radioactive materials. 3. "Standards for Steam Surface Condensers" as it relates to the MCES components that may contain radioactive materials. Specific criteria necessary to meet the relevant requirements of 10 CFR Part 50, Appendix A, General Design Criteria 60 and 64 are as follows: 1. The MCES capacity should be consistent with the industry guidelines given in Reference 2. Either mechanical vacuum pumps or steam jet-air ejectors may be used for hogging (startup) or normal evacuation of the main condenser. 2. The components of the MCES should be designed to Quality Group D as defined in Regulatory Guide 1.26 (Ref. 3) and to a nonseismic design classification. These quality standards meet the requirements of 10 CFR 50.55a for water- and steam-containing components that may contain radioactive materials but are not part of the reactor coolant pressure boundary and are less important to safety. 3. If there is a potential for explosive mixtures to exist, the MCES should be designed to withstand the effects of an explosion and provide instrumenta- tion to detect and annunciate the buildup of potentially explosive mixtures, or provide dual instrumentation to detect, annunciate, and effect control measures to prevent the buildup of potentially explosive mixtures, as outlined in SRP Section 11.3, subsection II, "Acceptance Criteria," Item 6. Such a potential does not exist on systems designed to maintain the steam content above 58% by voTiie in hydrogen-air mixtures or nitrogen content above 92% by volume in hydrogen-oxygen mixtures in all MCES components. 10.4.2-2 Rev. 2 - July 1981 4.