EOP-F-0 Critical Safety Function Status Trees

CSFST Report

Priority Order?

Color/Term correspondence?

“South Carolina Highway Patrol Zooms In”

Subcriticality

Core Cooling

Heat Sink

(P) Integrity

(Z) Containment

Inventory

FOP Criteria

Red

Orange

Yellow

FOP Criteria

Green

Higher Priority Challenge

E-Network Notes/Cautions versus F-0 Utilization

(Step 1 Note)

Sequence and Methods of Monitoring

(Step 2 Note)

Use acronym SCHPZI for priority order

Computer and Attachments

Requirements to STOP monitoring CSF

If continuing to monitor, how often?

ANY bullet sufficient to stop

Normal: 10-20min monitoring

Red/Orange: Continuously

Subcriticality Tree (S)

(Attachment 1)

FR-S.1

Red: >5% IRNI

Orange: <5% but >1E-5% and Positive Startup Rate

FR-S.2

Yellow: <5% but >1E-5%, SUR Negative but SUR > -0.2dpm

(-1.9 - 0)

Yellow: <5% and <1E-5% but Positive SUR

Core Cooling (C)

(Attachment 2)

FR-C.1

Red: CETs >1200°F

FR-C.2

Orange: <1200°F but <10°F[50°F] SCM and CETs >870°F

FR-C.3

Yellow: <1200°F but <10°F[50°F] SCM good and <870°F

Heat Sink (H)

(Attachment 3)

FR-H.1

Red: No PRHR + Total Feed <400gpm + SGNR Both <21%

Yellow: No PRHR + Feed okay (>400gpm) but Uncoupled

FR-H.2

Yellow: PRHR good but cannot maintain both SGs <1,232psig

FR-H.3

Yellow: PRHR good + SG pressures good (<1,232psig) but can’t maintain below 66.8%

FR-H.4

Yellow: PRHR good + SG pressures good (<1,232psig) + Level good (<66.8%) but can’t maintain below 1,185psig (safeties)

FR-H.5

Yellow: RHR good + SG pressures good (<1,232psig) + Level good (<66.8%) + SG pressures really good (<1,185psig) but can’t maintain >21% SGNR Inventory

Integrity (P)

(Attachment 4)

FR-P.1

Red: Exceed CD 100°F/hr + ALL T_cold < Limit A

Orange: Exceed CD 100°F/hr but Limit A good, but ALL T_cold < 98°F

Orange: CD good (<100°F/hr) but <350°F + <500psig + < 98°F

FR-P.2

Yellow: Exceed 100°F/hr but Limit A good and T_cold good (>98°F) but <128°F

Yellow: CD good (<100°F/hr) but <350°F + <500psig but still >98°F

Integrity (P)

Limit A Graph

(Right Side is good, Hot avoids Brittle Fracture/Nil-Ductile)

Containment (Z)

(Attachment 5)

FR-Z.1

Red: >59psig

Orange: Design good (<59psig) but no PCS and >5psig

Yellow: Design good (<59psig), PCS good, Level good (<94.4%), Rad good (<2R/hr), but can’t maintain <5psig

FR-Z.2

Orange: Design good (<59psig), PCS good, but Level >94.4%

FR-Z.3

Yellow: Design good (<59psig), PCS good, Level good (<94.4%), but Rad >2R/hr

FR-Z.4

Yellow: Everything mentioned above is good but <0.1psig (Drawing Vacuum)

Inventory (Z)

(Attachment 6)

FR-I.1

Orange: >66%

Yellow: Within 22.3% - 66% but >38.3%

FR-I.2

Yellow: <66% but can’t maintain >22.3%