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DCEDE

=

CEDE dose (rem)

DCFi

=

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

(IAR)ij

=

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

(BR)j

=

Breathing rate during time period j (m3/s)

Oj

=

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

15A.2.3

Total Dose (Total Effective Dose Equivalent)

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

15A.3

General Analysis Parameters

15A.3.1

Source Terms

15. Accident Analyses

15A.2.2

Inhalation Dose

AP1000 Design Control Document

j

where:

The CEDE doses are calculated using the equation:

(IAR )ij (BR )j O

DCEDE

=

DCFi

i

j

The sources of radioactivity for release are dependent on the specific accident. Activity may be released from the primary coolant, from the secondary coolant, and from the core if the accident involves fuel failures. The radiological consequences analyses use conservative design basis source terms.

15A.3.1.1

Primary Coolant Source Term

The design basis primary coolant source terms are listed in Table 11.1-2. These source terms are based on continuous plant operation with 0.25-percent fuel defects. The remaining assumptions used in determining the primary coolant source terms are listed in Table 11.1-1.

The accident dose analyses take into account increases in the primary coolant source terms for iodines and noble gases above those listed in Table 11.1-2, consistent with the Tech Spec limits of 1.0 µCi/g dose equivalent I-131 for the iodines and 280 µCi/g dose equivalent Xe-133 for the noble gases.

The radiological consequences analyses for certain accidents also take into account the phenomenon of iodine spiking, which causes the concentration of radioactive iodines in the primary coolant to increase significantly. Table 15A-1 lists the concentrations of iodine isotopes associated with a pre-existing iodine spike. This is an iodine spike that occurs prior to the accident

Tier 2 Material

15A-3

Revision 12

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