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:
ed 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. Provisions to control and monitor releases of radioactivity to the environ- ment from the MCES must conform to the requirements of General Design Cri- teria 60 and 64 (Ref. 1). 5. The design pressure and normal operational absolute pressure should be provided for MCES components containing potentially explosive mixtures. III. REVIEW PROCEDURES The ETSB reviewer will select and emphasize material from this SRP section as 'may be appropriate for a particular case. 1. In the ETSB review of the MCES, the P&IDs are reviewed to determine the flow paths of gases through the system, including all bypasses, and the points of release of gaseous wastes to the environment or other systems. This information is used in SRP Section 11.3 to calculate the quantity of radioactive material released annually in gaseous effluents during normal operations, including anticipated operational occurrences. ETSB verifies that water from the mechanical vacuum pumps and condensate from the steam jet air ejectors are classified as radioactive liquids and treated accordingly. 2. ETSB reviews the equipment quality group classifications to meet the guide- lines of Regulatory Guide 1.26 (Ref. 3). Exceptions are transmitted to MEB, which has primary responsibility under SRP Section 3.2.2. 3. If there is a potential that explosive mixtures may exist, ETSB determines whether the applicant has designed the MCES to withstand the effects of such an explosion and has provided instrumentation to detect and annunciate or has provided dual instrumentation on redundant MCES trains to detect, annunciate, and effect control measures to prevent the buildup of poten- tially explosive mixtures. This review is conducted by ETSB concurrently with its review as outlined in SRP Section 11.3 for a gaseous radioactive waste