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15. Accident Analyses

AP1000 Design Control Document

Table 15A-6

PCS Air

Containment

Safety Valve

Steam Line

Handling

Diffuser(3)

Release Points(4)

Releases(5)

Break Releases

Area(6)

0 - 2 hours

2.2E-3

2.2E-3

2.0E-2

2.4E-2

6.0E-3

2 - 8 hours

1.4E-3

1.4E-3

1.8E-2

2.0E-2

4.0E-3

8 - 24 hours

6.0E-4

6.0E-4

7.0E-3

7.5E-3

2.0E-3

1 - 4 days

4.5E-4

4.5E-4

5.0E-3

5.5E-3

1.5E-3

4 - 30 days

3.6E-4

3.6E-4

4.5E-3

5.0E-3

1.0E-3

CONTROL ROOM ATMOSPHERIC DISPERSION FACTORS (χ/Q) FOR ACCIDENT DOSE ANALYSIS

χ/Q (s/m3) at HVAC Intake for the Identified Release Points(1)

Plant Vent or

Ground Level

PORV and

Fuel

PCS Air

Containment

Safety Valve

Steam Line

Handling

Diffuser(3)

Release Points(4)

Releases(5)

Break Releases

Area(6)

0 - 2 hours

6.6E-4

6.6E-4

4.0E-3

4.0E-3

6.0E-3

2 - 8 hours

4.8E-4

4.8E-4

3.2E-3

3.2E-3

4.0E-3

8 - 24 hours

2.1E-4

2.1E-4

1.2E-3

1.2E-3

2.0E-3

1 - 4 days

1.5E-4

1.5E-4

1.0E-3

1.0E-3

1.5E-3

4 - 30 days

1.3E-4

1.3E-4

8.0E-4

8.0E-4

1.0E-3

Fuel

χ/Q (s/m3) at Control Room Door

for the Identified Release Points(2)

Plant Vent or

Ground Level

PORV and

Notes:

  • 1.

    These dispersion factors are to be used 1) for the time period preceding the isolation of the main control room and actuation of the emergency habitability system, 2) for the time after 72 hours when the compressed air supply in the emergency habitability system would be exhausted and outside air would be drawn into the main control room, and 3) for the determination of control room doses when the non-safety ventilation system is assumed to remain operable such that the emergency habitability system is not actuated.

  • 2.

    These dispersion factors are to be used when the emergency habitability system is in operation and the only path for outside air to enter the main control room is that due to ingress/egress.

  • 3.

    These dispersion factors are used for analysis of the doses due to a postulated small line break outside of containment. The plant vent and PCS air diffuser are potential release paths for other postulated events (loss-of-coolant accident, rod ejection accident, and fuel handling accident inside the containment); however, the values are bounded by the dispersion factors for ground level releases.

  • 4.

    The listed values represent modeling the containment shell as a diffuse area source, and are used for evaluating the doses in the main control room for a loss-of-coolant accident, for the containment leakage of activity following a rod ejection accident, and for a fuel handling accident occurring inside the containment.

Tier 2 Material

15A-15

Revision 12

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