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(BR)j

=

Breathing rate during time period j (m3/s)

(χ/Q)j

=

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

15. Accident Analyses

AP1000 Design Control Document

15A.1.3

Total Dose (Total Effective Dose Equivalent)

The TEDE doses are the sum of the EDE and the CEDE doses.

15A.2

Main Control Room Dose Models

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

15A.2.1

Immersion Dose Models

Due to the finite volume of air contained in the main control room, the immersion dose for an operator occupying the main control room is substantially less than it is for the case in which a semi-infinite cloud is assumed. The finite cloud doses are calculated using the geometry correction factor from Murphy and Campe (Reference 1).

The equation is:

Dim

=

1 GF

DCFi

i

j

(IAR )ij O

j

where:

Dim

=

Immersion (EDE) dose (rem)

GF

= =

Main control room geometry factor 1173/V0.338

V

=

Volume of the main control room (ft3)

DCFi

=

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

(IAR)ij

=

Integrated activity for isotope i in the main control room during time period j (Ci-s/m3)

Oj

=

Fraction of time period j that the operator is assumed to be present

Tier 2 Material

15A-2

Revision 12

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