Water Supply and Distribution System Criteria

DOE-STD-1066-99

facilities where required for protection of human life.

5.3.3

Where required by the Safety Analysis Report (SAR), the design of fire protection

systems to withstand seismic events should be in accordance the criteria developed

by the National Fire Protection Association, except as required by other DOE criteria,

such as in Section 7 of this standard.

5.3.4

Fire protection systems, or portions of them, that must function to control effects of

a Design Basis Accident (DBA) event (as determined by safety analysis accident

scenarios) should be designed to be functional for all conditions included in the

accident scenario. This should include both the event initial cause and its

consequences.

5.3.5

When the use of water sprinkler coverage is precluded because of nuclear criticality

or other incompatibility reasons, nonaqueous extinguishing systems (e.g., inert gas,

carbon dioxide, Halon alternatives, etc.) should be used.

5.3.6

Standpipes should be installed in all structures having three levels or more above or

below grade. Standpipe systems should be provided in other structures, such as

those with extensive and complex interior layouts, where deemed necessary by the

DOE Fire Protection AHJ. Standpipes should be designed and installed as Class 1

systems per NFPA 14.

WATER SUPPLY AND DISTRIBUTION SYSTEM CRITERIA

6.1

Demand

6.1.1

Domestic water distribution systems that also serve fire protection requirements

should be designed to satisfy the calculated Fire Hydrant Demand (see Paragraph

6.1.2) and the peak domestic demand. Where no other requirements are applicable,

the peak domestic demand should be based on 2.5 times the calculated average daily

demand plus any special demands, such as industrial or processes that cannot be

reduced during a fire. The distribution system should be capable of meeting this

combined demand at a minimum residual pressure of 20 psi at ground elevation (or

higher elevation if special conditions apply) for a period of not less than 2 hours.

Municipal supplies having the same capability are acceptable.

6.1.2

Fire Hydrant Demand - Where reliance is placed on fire department response, either

for protection of unsprinklered buildings or where the fire department will serve as

redundant (backup) protection, the water supply available from hydrants should be

capable of providing the flow rates established in the Uniform Fire Code based on the

most severe facility fire risk on site. These values may be reduced by a maximum of

50% when the facility is provided with automatic sprinkler protection throughout, in

accordance with the applicable NFPA Standards.

6.1.3

Within a building or facility, domestic water should be supplied by a separate service

line and not be a combined fire protection and potable water service or a combined

process water and potable water system. Where combined fire and domestic-process

water systems are used, distribution piping should be routed and provided with valves