3.5.8.3

Do auditory and visual alert signals have appropriate intensity?

Alarm signals should not startle, annoy or distract operators, or interfere with verbal communication. Auditory signals should be 10 dB (A) above the ambient noise, but should not exceed 95 dB (A). Signal levels of 115 dB (A) may be used if indicating extreme danger. Visual signals, such as flash lights or flashing symbols, should have a flash rate of 3-5 flashes per second with approximately equal on and off times.

NUREG0700 point 4.2.6.3-9, p. 280, NUREG, point 4.2.6.2-3, p. 278.
DC: Applicable to the DC