Document: NUREG-0800
Document ID: b4cff877-ab63-46c3-8140-32e309d767a2
Document Type: srp
Title: EMERGENCY DIESEL ENGINE STARTING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070571.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.6
CFR Part: 
CFR Title: 

Content:
as follows: a. Regulatory Guide 1.9 as related to the design of the diesel air starting systems. b. Branch Technical Position ICSB-17 (PSB) as related to diesel engine air starting systems' protective interlocks during accident conditions.25 cb . NUREG/CR-0660 "Enhancement of Onsite Emergency Diesel Generator 26 Reliability" (Reference 10) . 27 dc . ANSI/IEEE Stdandard 387 as related to the design of the diesel engine air 28 29 starting system (Reference 11) . 30 ed . Diesel Engine Manufacturers Association (DEMA) Standard (Reference 12) as 31 32 related to the design of the diesel air starting system. fe . Each diesel engine should be provided with a dedicated air starting system 33 consisting of an air compressor, an air dryer, one or more air receiver(s), piping, injection lines and valves, and devices to crank the engine as recommended by the engine manufacturer. gf . As a minimum, the air starting system should be capable of cranking a cold diesel 34 engine five times without recharging the receiver(s). The air starting system capacity should be determined as follows: (1) each cranking cycle duration should be approximately 3 seconds; (2) consist of two to three engine revolutions; or (3) air start requirements per engine start provided by the engine manufacturer; whichever air start requirement is larger. hg . Alarms should be provided which alert operating personnel if the air receiver 35 pressure falls below the minimum allowable value. ih . Provisions should be made for the periodic or automatic blowdown of 36 accumulated moisture and foreign material in the air receiver(s), and other critical points of the system. ji . Starting air should be dried to a dew point of not more than 10 C (50 F) when 37 38 installed in a normally controlled 21 C (70 F) environment, otherwise the 39 starting air dew point should be controlled to at least 5.5 C (10 F) less than the 40 lowest expected ambient temperature. Plants that have emergency ac sources in excess of minimum