Station blackout at Browns Ferry Unit One - Oak Ridge National ...

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However, injection capability would ultimately be lost during an ex tended Station Blackout, either through exhaustion of the installed bat tery capacity or earlier, through secondary failures of vital equipment. Once injection capability is lost, the Station Blackout would become a Severe Accident with inevitable core uncovery. The remainder of this re port proceeds from an assumption that the Blackout does develop into a Severe Accident, involving core meltdown and subsequent fission product release to the atmosphere.
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Page 1 and 2: ond 0/JJ< H'DGE NATIONAL LABORATORY
Page 3: Contract No. W-7405-eng-26 Engineer
Page 6 and 7: 10.3 Operator Key Action Event Tree
Page 8 and 9: vx The operator would also take act
Page 10 and 11: viii This study has established tha
Page 13 and 14: STATION BLACKOUT AT BROWNS FERRY UN
Page 15 and 16: Table 1.1 Shared safeguards systems
Page 17: 2. DESCRIPTION OF STATION BLACKOUT
Page 21 and 22: CTi XI XI 1 1 CO 1 ^N fi 1 fi CU 1
Page 23 and 24: 11 A third consideration would be t
Page 25 and 26: 259° PCV 1-19 pcv l-» PCV 1-22 KV
Page 27 and 28: DRYWELL AMBIENT TEMPERATURE (°F) 0
Page 29 and 30: 17 4. COMPUTER MODEL FOR SYSTEM BEH
Page 31 and 32: 19 This equation predicts a. linear
Page 33 and 34: 100 90 £ 80 o Q- 70 < 2
Page 35 and 36: 23 atmosphere, to cold surfaces (su
Page 37 and 38: 00 00 (m) 14 13 > z 12 I" LU 10 > U
Page 39 and 40: 27 transfer to the drywell liner is
Page 41 and 42: 29 variables such as reactor vessel
Page 43 and 44: 31 5. Feedwater flow. One channel o
Page 45 and 46: 33 6. OPERATOR ACTIONS DURING STATI
Page 47 and 48: p TJ Cu rt rt rt Oj cr rt CO B n Co
Page 49 and 50: 37 7. Drywell atmosphere temperatur
Page 51 and 52: UJ rr UJ cc a. S < to- Pig. pressur
Page 53 and 54: 41 7.3.2.2 Reactor vessel level —
Page 55 and 56: 8 8- * o. —' o u- o. o Q to UJ
Page 57 and 58: o X E ^ c _J UJ _l > UJ UJ >
Page 59 and 60: SUPPRESSION CHAMBER TEMPERATURES (
Page 61 and 62: a. o o to LLI rr —^ co CO UJ
Page 63 and 64: 360 390 420 TIME (min) Fig. 7.10 Lo
Page 65 and 66: 240 270 300 330 360 390 420 TIME (m
Page 67 and 68: o X o o a. z o LU cc a. a. 3 to .=
Page 69 and 70:
Fig. 7.15 Loss of 250 VDC batteries
Page 71 and 72:
59 8. FAILURES LEADING TO A SEVERE
Page 73 and 74:
61 power is restored. There is no r
Page 75 and 76:
63 The first threat to the continue
Page 77 and 78:
p- rt o rt rt p- co rr O CO CD h- f
Page 79 and 80:
S 8 5 o CO- Q co J UJ -H I- ? CM E
Page 81 and 82:
69 Table 8.1 Unit preferred system
Page 83 and 84:
71 9.0 ACCIDENT SEQUENCES RESULTING
Page 85 and 86:
lU S rMU TJ CU CU TJ u Xi B CU 3 3
Page 87 and 88:
INITIATING EVENT LOSS OF OFFSITE AN
Page 89 and 90:
INITIATING EVENT -CORE MELT YES A L
Page 91 and 92:
3000.0 2500.0- 3 2000.0 \- < cc H 1
Page 93 and 94:
12.0 10.0 3 8.0- > UJ _J UJ cc 6.0
Page 95 and 96:
1400.0 — 1200.0 «— Q O Z UJ cc
Page 97 and 98:
400.0 350.0- "E 300.0- < QC * < UJ
Page 99 and 100:
87 Table 9.1 Browns Ferry Nuclear P
Page 101 and 102:
89 Time (sec) Event 29.7 Two out of
Page 103 and 104:
91 Time (sec) Event 340 min. Averag
Page 105 and 106:
93 Table 9.2 Browns Ferry Nuclear P
Page 107 and 108:
95 Time (sec) Event 22.0 Suppressio
Page 109 and 110:
97 Time (sec) Event 384 min. Averag
Page 111 and 112:
99 is depressurized during core unc
Page 113 and 114:
101 Time (sec) Event 3.0 Turbine tr
Page 115 and 116:
103 Time (sec) Event 21.14 min. Cor
Page 117 and 118:
105 Time (sec) Event 821.5 min. Dry
Page 119 and 120:
107 Time (sec) Event 3.0 Turbine tr
Page 121 and 122:
109 Time (sec) Event 396.36 min. Co
Page 123 and 124:
Ill Time (sec) Event 3»5 Power gen
Page 125 and 126:
70 80 Time (sec) min. min. Core mel
Page 127 and 128:
115 Time (sec) Event The leak rate
Page 129 and 130:
117 Time (sec) Event 3.5 Power gene
Page 131 and 132:
119 Time (sec) Event 56.6 min. Core
Page 133 and 134:
121 Time (sec) Event The leak rate
Page 135 and 136:
123 Figure 9.12 shows the reactor v
Page 137 and 138:
~r3> 600.0 -r 500.0 w 400.0 Q. o cc
Page 139 and 140:
CT> (x 104) 30.0 25.0- a 20.0 < cc
Page 141 and 142:
* » 300.0 250.0- o> 200.0 CO a! Z
Page 143 and 144:
00 50.0 100.0 150.0 200.0 250.0 TIM
Page 145 and 146:
800.0 -T 700.0- E ^ 600.0 o r- < £
Page 147 and 148:
(x 103) 18.0 16.0 14.0 _ 12.0 H O)
Page 149 and 150:
9000.0 8000.0 7000.0 _ 6000.0- < 50
Page 151 and 152:
1600.0 1400.0- ~ 1200.0 cc D r- <
Page 153 and 154:
s. cc UJ cc Q. r- Z UJ cc < S o o (
Page 155 and 156:
CO Q. (x 104) 10.0 8.0- uj6.0rr a.
Page 157 and 158:
(ed) sansssad iNswiavdwoo nvioi in
Page 159 and 160:
o Q_ UJ CC 3 UJ IX a. (x 104) 8.0 7
Page 161 and 162:
149 As the drywell ambient temperat
Page 163 and 164:
UJ cc 3 r- 550.0 500.0- cc 450.0 ui
Page 165 and 166:
(x 105) 10.0- 9.0 « CD 8(H Q. UJ C
Page 167 and 168:
CD Ch (x 104) 25.0 20.0- oi cc 3 CO
Page 169 and 170:
200.0 300.0 400.0 TIME (min) 500.0
Page 171 and 172:
(x 104) 20.0 £ 15.0- UJ cc 3 UJ cc
Page 173 and 174:
161 10. PLANT STATE RECOGNITION AND
Page 175 and 176:
163 power, characterized by the una
Page 177 and 178:
165 11. INSTRUMENTATION AVAILABLE F
Page 179 and 180:
167 12. IMPLICATIONS OF RESULTS The
Page 181 and 182:
169 Blackout while the unit battery
Page 183 and 184:
3 M O o ro 13 rt X to C i-t P p. fu
Page 185 and 186:
1. Browns Ferry FSAR, Appendix F. 1
Page 187 and 188:
175 33. W. G. Anderson, P. W. Huber
Page 189:
177 ACKNOWLEDGEMENT Mr. William A C
Page 193:
181 **$CONTINUOUS SYSTEM MODELING P
Page 196 and 197:
184 * CALCULATION OF FLOW RESISTANC
Page 198 and 199:
186 * TPMETO=INITIAL TEMP : SP META
Page 200:
188 * RETURNS: DOWNCOMER HEIGHT!ABO
Page 203 and 204:
* * * 191 INTERFACE VARIABLES : RV
Page 205:
193 DUMSPG-EPSSP-t-EPHSP+EPNSP-e-EP
Page 209:
197 APPENDIX B MODIFICATION TO MARC
Page 214 and 215:
SNLCOOL SEND 202 INDUCE NC0B*2, NHP
Page 217 and 218:
205 Appendix D PRESSURE SUPPRESSION
Page 219 and 220:
SUPPRESSION CHAMBER TOROIDAL HEADER
Page 221 and 222:
209 types of transients: (1) LOCA-r
Page 223 and 224:
211 steam condensation oscillations
Page 225 and 226:
213 originally developed for vertic
Page 227 and 228:
VESSEL CENTER R6 R7 R8 Rg Fig. D.5
Page 229 and 230:
217 APPENDIX E A COMPENDIUM OF INFO
Page 231 and 232:
219 E.3 HPCI Pump Suction The HPCI
Page 233 and 234:
221 E.5 Turbine Trips On an HPCI tu
Page 235 and 236:
223 APPENDIX F A COMPENDIUM OF INFO
Page 237 and 238:
225 normally open AC-motor-operated
Page 239 and 240:
227 F.6 System Isolation The Primar
Page 241 and 242:
229 APPENDIX G EFFECT OF TVA-ESTIMA
Page 243 and 244:
a. 2 cr co n CO UJ oc a. < ui rco o
Page 245 and 246:
t— > 2- UJ 8 2- UJ > CO CO UJ > o
Page 247 and 248:
VOLUME(20000 VOLUME D3501•._!_ 30
Page 249 and 250:
O o_ CO UJ cr r- < CC UJ a. m 5 < g
Page 251:
(T CM. § x CO UJ cc D UJ ts. tr -
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