Document: NUREG-0800
Document ID: 91b47227-679e-4e3e-95a7-e32002caa9a9
Document Type: srp
Title: EMERGENCY DIESEL ENGINE COMBUSTION AIR INTAKE AND EXHAUST
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550033.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.8
CFR Part: 
CFR Title: 

Content:
means of reducing airborne particulate material over the entire time period requiring emergency power, assuming the maximum airborne particulate concentration at the combustion air intake. D. Suitable design precautions must preclude degradation of the diesel engine power output due to exhaust gases and other diluents that could reduce oxygen content below acceptable levels. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 2 requires that SSCs important to safety be designed to withstand the effects of natural phenomena like earthquakes, tornadoes, hurricanes, floods, tsunamis, and seiches without loss of capability to perform safety functions. The EDECAIES safety function is to supply quality combustion air and an exhaust path for the emergency diesel engine following a loss of offsite power. Compliance with GDC 2 requirements provide assurances that natural phenomena events will not affect EDECAIES capability to supply quality combustion air and an exhaust path for the emergency diesel engine. 2. GDC 4 requires that SSCs important to safety be designed to withstand the dynamic pipe rupture effects like pipe whip, jet impingement, and externally- or internally-generated missiles. The EDECAIES safety function is to provide combustion air and an exhaust path for the emergency diesel engines following a loss of offsite power. Compliance with GDC 4 provides assurance that the dynamic effects of equipment failures and events outside the plant will not affect the EDECAIES capability to provide combustion air and an exhaust path for the emergency diesel engine. 3. GDC 5 prohibits the sharing of SSCs important to safety among nuclear power units unless such sharing can be demonstrated not to impair their ability to perform safety functions, including in an accident in one unit an orderly shutdown and cooldown of the remaining unit.