Uninterruptible Power Supply (UPS)

DOE-HDBK-XXXX-2005

06/30/2005

640.

UNINTERRUPTIBLE POWER SUPPLY (UPS). A power supply that provides

automatic, instantaneous power, without delay or-transients, on failure of normal power.

It can consist of batteries or full-time operating generators. It can be designated as

standby or emergency power depending on the application. Emergency installations

must meet the requirements specified for emergency power. [DOE O 5480.30]

[EH62dd1]

641.

UNINTERRUPTIBLE POWER SUPPLY. A system intended to provide a continuous

source of power, without delay or transients, upon degradation of failure of the normal

source of power. [DOE-STD-3003-2000]

UNIQUE IDENTIFIERS. The part of a paired set of labels, used in records that contain

642.

confidential information, that does not identify individuals except by using the matching

label. [10 CFR 850.3]

643.

UNIRRADIATED ENRICHED URANIUM (UEU). Naturally occurring uranium

enriched with U-235 above its natural abundance of approximately 0.72 percent (weight

percent) that has not been exposed to a neutron flux. [DOE O 6430.1A]

644.

UNPLANNED SHUTDOWN. An unplanned facility shutdown for any cause, such as

equipment malfunction, personal error, or onshift operator response to indications of an

unsatisfactory situation, or a situation that would have had unsafe consequences without

shutdown. Also, an unplanned shutdown directed by contractor management, local DOE

officials, or by Headquarters. [DOE O 5480.31] [EH62dd1]

645.

UNQUALIFIED PERSON. A person who is not a qualified person. [NFPA 70E]

UNREVIEWED SAFETY ISSUE (USI). A USI [for an Accelerator Facility] exists if a

646.

proposed change, modification, or experiment will either: (1) significantly increase the

probability of occurrence (through reduction in the margin of safety or otherwise) or the

consequences of an accident or malfunction of equipment important to safety from that

evaluated previously by safety analysis; or (2) introduce an accident or malfunction of a

different type than any evaluated previously by safety analysis which could result in

significant consequences. [DOE 0 5480.25 cancelled, DRAFT DOE G 420.2-X]

647.

UNREVIEWED SAFETY QUESTION (USQ). A situation where

A. The probability of the occurrence or the consequences of an accident or the

malfunction of equipment important to safety previously evaluated in the

documented safety analysis could be increased;

104

DRAFT