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.)

b. Actions

Action statements are to completely describe the actions to be taken in

the event that the SL is not met.

c. Selection of SLs

SLs are those limits which, if exceeded, could directly cause the failure

of one or more of the barriers that prevent the uncontrolled release of

radioactive or other hazardous materials.

Combined Section 3/4

Within the TSR document, Section 3 delineates the Operational Limits,

and Section 4 describes the Surveillance Requirements. There is usually

a one-to-one correlation between the operational limits and the

surveillance related to each. Thus, for convenience, each limit is typically

presented at the same place as its related surveillance, and the

combined information is designated Section 3/4.

This combined section should contain the Limiting Control Settings and

the Limiting Conditions for Operation, as well as mode applicability

information, Action Statements, and Surveillance Requirements, for each

requirement.

3. Operational Limits (OLs)

The initial conditions of the safety (accident) analyses upon which the

authorization to operate is based are the least conservative limits of

acceptable operation. These initial condition values must be adjusted for

both instrument error and the expected instrument drift between

surveillances, and an allowance should be made for calculational

uncertainties prior to being used as limits in the TSRs.

The most conservative value for each parameter contained in the safety

analyses makes up the envelope within which the facility must operate in

order to ensure that the SAR analyses found safe operations. Provided

the facility is operated within these SAR initial condition limits, the SAR

results accurately demonstrate that the consequences of

accidents/transients/incidents are acceptable.