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15. Accident Analyses

AP1000 Design Control Document

APPENDIX 15A

EVALUATION MODELS AND PARAMETERS FOR ANALYSIS OF RADIOLOGICAL CONSEQUENCES OF ACCIDENTS

This appendix contains the parameters and models that form the basis of the radiological consequences analyses for the various postulated accidents.

15A.1

Offsite Dose Calculation Models

Radiological consequences analyses are performed to determine the total effective dose equivalent (TEDE) doses associated with the postulated accident. The determination of TEDE doses takes into account the committed effective dose equivalent (CEDE) dose resulting from the inhalation of airborne activity (that is, the long-term dose accumulation in the various organs) as well as the effective dose equivalent (EDE) dose resulting from immersion in the cloud of activity.

15A.1.1

Immersion Dose (Effective Dose Equivalent)

Assuming a semi-infinite cloud, the immersion doses are calculated using the equation:

Dim

=

DCFi Rij

(χ /Q )j

i

j

where:

15A.1.2

Dim

=

Immersion (EDE) dose (rem)

DCFi

=

EDE dose conversion factor for isotope i (rem-m3/Ci-s)

Rij

=

Amount of isotope i released during time period j (Ci)

(χ/Q)j

=

Atmospheric dispersion factor during time period j (s/m3)

Inhalation Dose (Committed Effective Dose Equivalent)

The CEDE doses are calculated using the equation:

DCEDE = DCFi Rij

(BR )j (χ /Q )j

i

j

where:

DCEDE

=

CEDE dose (rem)

DCFi

=

CEDE dose conversion factor (rem per curie inhaled) for isotope i

Rij

=

Amount of isotope i released during time period j (Ci)

Tier 2 Material

15A-1

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