Technical Safety Requirement (TSR) Format and Content cont'd

Radiological Assessor Training

DOE-HDBK-1141-2001

Handouts

Technical Safety Requirement (TSR) Format and Content (cont.)

a. Limiting Control Settings (LCSs)

LCSs should describe, as precisely as possible, the parameter being

controlled and its limits, or the limiting setting of the device to control it.

b. Limiting Conditions for Operation (LCOs)

The LCO statement describes, as precisely as possible, the lowest

functional capability or performance level or equipment required for

continued safe operation of the facility.

Other elements to be address under OLs include:

c. Applicability (mode applicability)

d. Action (Action Statement in the event the LCS or LCO is not met)

e. Surveillance Requirements

f. LCSs of instruments that monitor process variables at nonreactor

nuclear facilities (NNFs) are the settings that either initiate protective

devices themselves or sound an alarm to alert personnel to take action

in order to protect barriers that prevent the uncontrolled release of

radioactive materials.

g. Selection of LCOs (for NNFs) should be written only for systems and

equipment that meet one (or more) of the following descriptions:

Installed instrumentation that is used to detect and indicate in the

control room or other control location an inadvertent criticality or a

significant degradation of the physical barriers that prevent the

uncontrolled release of radioactive materials

Structures, systems, and components that are relied upon in the

SAR to function or actuate to prevent or mitigate accidents, or

transients that either involve the assumed failure of, or present a

challenge to, the integrity of a physical barrier that prevents the

uncontrolled release of radioactive materials