ML21286A431

Amendment 29 to Updated Final Safety Analysis Report, Chapter 8, Table 8.8, Evaluation of the 24-V DC Power Supply

ML21286A431
Person / Time
Site:	Browns Ferry
Issue date:	10/04/2021
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
Shared Package
ML21286A574	List: ML21277A142 ML21286A195 ML21286A196 ML21286A197 ML21286A198 ML21286A199 ML21286A200 ML21286A201 ML21286A204 ML21286A205 ML21286A206 ML21286A210 ML21286A211 ML21286A212 ML21286A213 ML21286A216 ML21286A217 ML21286A218 ML21286A219 ML21286A220 ML21286A221 ML21286A222 ML21286A223 ML21286A224 ML21286A225 ML21286A226 ML21286A227 ML21286A229 ML21286A230 ML21286A231 ML21286A232 ML21286A233 ML21286A234 ML21286A235 ML21286A236 ML21286A237 ML21286A238 ML21286A239 ML21286A240 ML21286A241 ML21286A242 ML21286A243 ML21286A244 ML21286A245 ML21286A246 ML21286A247 ML21286A248 ML21286A249 ML21286A250 ML21286A252 ... further results
References
Download: ML21286A431 (3)

Text

BFN-16 Table 8.8-1 (Deleted by Amendment 9)

BFN-16 Table 8.8-2 (Deleted by Amendment 7)

BFN-17 Table 8.8-3 EVALUATION OF THE 24-V DC POWER SUPPLY Results Consequence of Component Losing 24-V DC Supply Losing 24-V DC Supply

1. Source Range Monitors and (a) Loss of source range indication I. Plant shutdown - (all rods in)

SRM Trip Auxiliaries with annunciation of loss a. startup prevented by rod (alarm) block (b) Rod Block b. startup prevented by technical specifications II. In STARTUP MODE (MODE 2)-

a. rod withdrawal stopped by SRM rod block.

2. Intermediate Range Monitors (a) Loss of intermediate range I. In STARTUP MODE (MODE 2)-

and IRM Trip Auxiliaries indication with annunciation a. IRM Rod Block and of loss (alarm) IRM Scram (b) Rod Block II. In RUN MODE (MODE 1)-

a. None - Protection (c) Scram provided by APRM. SRM's and IRM's withdrawn.

3. Trip auxiliaries for off- (a) Off-gas valve isolation signal I. Off-gas valve closes gas radiation monitor and generated timer control

4. Stack Gas Radiation Monitor (a) Instrument failure alarm I. None - Off-gas line isolated on unit with failed 24-V DC system - log off-gas monitors available on all units.

5. Linear Off-gas Radiation (a) Loss of indication I. None - Backed up by two log Monitor off-gas radiation monitors powered from RPS bus.

6. RHR Service Water Effluent (a) Instrument Failure Alarm I. None - Sampling frequency Radiation Monitors increased if RHR service water system in operation.

7. Liquid Rad Waste Effluent (a) Instrument Failure Alarm I. None - Liquid radwaste Radiation Monitor discharge based on tank sampling. However, discharge would be stopped by operator if in progress.

8. Reactor Building Closed (a) Instrument Failure Alarm I. None - Closed system.

Cooling Water System However, sampling frequency Radiation Monitor could be increased.

9. Raw Cooling Water Effluent (a) Instrument Failure Alarm I. None - Increased sampling Radiation Monitor frequency as necessary.