Uninterruptible Power Supply - doe-hdbk-1188-20060102

DOE-HDBK-1188-2006

644.

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

645.

confidential information, that does not identify individuals except by using the matching label. [10

CFR 850.3]

646.

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]

647.

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]

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

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

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, DOE G 420.2-1]

650.

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;

B. The possibility of an accident or malfunction of a different type than any

evaluated

previously in the documented safety analysis could be created;

C. A margin of safety could be reduced; or

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