RUS ENG Data on Chernobyl accident in a digital form  
Digit Data
The data given here below are received from records on the magnetic tape of the computation control system "SKALA" of power unit. The data of control rod positions and values of indications of in-core neutron flux sensors DKE(h) and DKE(r) is given for time moments 00:39 and 01:22:37, when corresponding dumps of the data have been made. Dump of other data on the magnetic tape with a binding on time was carried out automatically by program DREG according to the settings made at 01.00 on 26.04.86.
All this data are displayed graphically on the pictures 3 14 in section "Actual Data", and here they are repeated in an initial digital form. Some diagrams (fig. 7, 27, 8 and 11) already contain the initial digital information, but on the majority of them the primary data are approximated to 2 significant figures, this information here is repeated in a primary form (without a rounding off). The exception is made for control of neutron flux radial distribution by the DKE(r) sensors, there their indications are given without a rounding off and so it does not repeat here.

A. The data from listings of the program [PRISMA]
The routine [PRISMA] realize active processing of the reactor measurements which are carried out while in service of the reactor and necessary for the reactor control. The listings formed by the program contain the data of direct measurements by sensors of in-core control system PPDDCS, by flowmeters on an input in each technological channel, etc., and also results of calculations: of power allocation and burning out for each TC, margin before boiling crisis etc.

1. Indications of on-height sensors of neutron flux DKE(h) at 1:22:30.

The indications of sensors given in the table are proportional to local density of a neutron flux and normalized basically on the reactor power in W. Sensors are allocated on 7 sections on core height in each of 12 measuring channels. Numbering of sections is given from top of reactor core .
Numbers Numbers of sections
of cells 123 45 67
6047
6027
5057
5037
5017
4047
4027
3057
3037
3017
2047
2027
175
120
110
150
145
140
155
185
140
125
150
(93)
220
165
165
245
210
220
205
250
195
180
190
165
160
135
145
180
180
190
155
190
160
150
145
135
130
135
135
140
170
160
145
140
140
135
105
100
110
135
125
160
155
160
145
145
140
135
100
100
105
(122)
110
145
190
145
135
135
140
(127)
95
90
45
80
65
90
130
(86)
100
70
90
85
70
60

*) Values in brackets it is result of approximation, the real corresponding data are absent.

2. Positions of control rods.

In total rods are: 127 [RR] + 48 [AZ] + 12 [AR] + 24 [USP] = 211. The rods which were on top limit (TLS) and not changed this position are not specified in the table.

CPS TypePosition (m) CPSType Position(m)
cell of rod 00:39 01:22 cell of rod 00:3901:22
6433
6443
6231
6245
6251
6037
5645
5423
5427
5433
5437
5443
5453
5221
5023
5027
5047
5053
4615
4621
4635
4645
4655
4661
4413
4423
4433
4437
4443
4447
4453
4463
4231
4251
4265
4017
4023
4033
4043
USP
USP
RR
RR
PKAZ
RR
LAR
USP
PKAZ
USP
AR1
USP
USP
RR
RR
AR2
AR2
RR
RR
LAR
RR
RR
LAR
RR
USP
USP
USP
AR3
USP
RR
USP
USP
RR
AZ
RR
RR
AR1
AR3
AR3
1.97
0.75
3.32
1.97
0.2
1.09
0.81
1.83
1.97
1.83
0.14
0.88
1.15
0.14
0.34
2.04
2.04
0.27
0.75
2.17
1.97
0.47
0.0
2.51
2.04
1.83
1.42
0.07
1.15
2.51
2.92
3.05
0.2
1.42
1.83
1.42
0.14
0.07
0.07
0.86
0.20
2.45
0.0
0.2
0.0
0.13
0.0
0.26
0.0
1.39
0.0
0.13
0.14
0.66
1.58
1.58
0.27
0.0
1.26
1.0
0.33
0.2
1.39
0.0
0.07
0.0
0.20
0.0
0.80
1.19
1.92
0.2
1.42
1.83
0.0
1.39
0.20
0.20
4053
3641
3645
3413
3423
3433
3437
3443
3447
3453
3457
3463
3211
3215
3221
3231
3235
3245
3251
3255
3261
3027
3047
2625
2635
2655
2417
2423
2433
2437
2443
2453
2245
2251
2037
1631
1645
1433
1443
AR1
RR
RR
USP
USP
USP
AR3
USP
RR
USP
RR
USP
PKAZ
RR
LAR
RR
PKAZ
RR
AZ
LAR
RR
AR2
AR2
RR

RR
RR
USP
USP
AR1
USP
USP
LAR
RR
RR
RR
RR
USP
USP
0.14
1.5
0.88
1.83
1.22
1.28
0.07
2.98
1.5
0.95
1.67
1.83
0.2
2.04
2.78
0.2
2.70
0.23
0.0
1.02
2.71
2.04
2.04
1.50
1.50
0.27
0.20
1.83
1.83
0.14
1.15
1.02
1.70
1.15
1.49
2.65
1.70
0.14
1.97
1.39
1.5
0.88
1.83
0.07
0.0
0.20
0.20
1.2
0.99
1.63
0.0
0.2
1.25
0.0
0.2
2.65
0.13
0.40
0.0
0.20
1.58
1.58
0.0
0.33
0.27
0.20
0.0
0.0
1.39
0.07
0.0
0.30
0.79
0.2
0.0
0.33
0.13
0.0


3. Calculation of physics

It is understood here under this name a cartogram of the reactor core considering each individual technological channel in which are given: channel co-ordinates (4-place number YYXX); type of loading of the channel ([TK], [DP], [RR], [AR], DKE(r),
DKE(h) etc.); calculation of physics proper, i.e. power output of each channel (kw); energy production (MW*day); the water flow through the channel (m³/hour). The cartogram is given separately for left and for the right side of reactor at the moment of time 01:00-25.04.86 directly ahead of the beginning of decrease reactor power from rated value for a reactor stop on PPM.

B. The data from listings of the program DREG

1. Analogue parametres

Time dependence of parameters were registered in a digital form by program DREG (Diagnostic REGistration), since 01:00, on 26th of April. Key parametres characterising technical process in the reactor and the power unit, except the power value, thus have been registered. For two loops of which consists external (in relation to the reactor) a Multipass Forced Circulation Circuit (MFCC) and accordingly for two half of reactor (left and right) the separate data is more low given. These are following parameters.
1) Pressure in the separator drum Psd. (kG/cm²). In each loop of MFCC are two separator drums but they are well connected on pair, and pressure in them are identical.
2) Water level in a drum separator Hsd (mm). For each of two SD in the same half the levels can strongly differ. In tables (and on the picture) the data only for one of two SD is given.
3) Flow of feedwater Gfw (tn/hour).
4) Temperature of feedwater Tfw. (C).
5) Water temperature on ihe input of MCP (C).Tin(C).
6) Water flow through MCP Gmcp (1000*m³/hour), the data for each of MCP.

Table B1.
Parametres of MFCC (the left side).

 time
1:00:11
1:01:00
1:02:01
1:03:00
1:04:00
1:05:07
1:05:57
1:06:02
1:06:14
1:06:53
1:07:06
1:07:28
1:08:09
1:08:32
1:09:03
1:09:28
1:09:41
1:10:00
1:10:25
1:11:00
1:12:00

time
1:18:40
1:18:49
1:18:58
1:19:01
1:19:12
1:19:21
1:19:28
1:19:52
1:20:00
1:20:02
1:20:10
1:20:22
1:20:29
1:20:36
1:20:53
1:21:00
1:21:03
1:21:15
1:21:27
1:21:43
1:22:08
1:22:11
1:22:19
1:22:24
1:22:34

time
1:23:00
1:23:02
1:23:04
1:23:06
1:23:07
1:23:09
1:23:11
1:23:13
1:23:14
1:23:15
1:23:17
1:23:19
1:23:21
1:23:23
1:23:27
1:23:30
1:23:31
1:23:32
1:23:36
1:23:39
1:23:41
1:23:43
1:23:45
1:23:46
1:23:47
1:23:48
Psd
-
68.4
68.4
68.4
68.2
68.2
68.2
68.2
68.4
67.8
67.6
66.8
65.4
65.0
64.2
64.6
65.2
65.4
66.0
66.6
67.6

Psd
68.2
68.2
68.2
67.8
67.8
-67.8
-
-
-
-
-
-
-
-
-
66.5
66.4
66.0
65.8
-
-
64.4
-
64.2
63.8

Psd
-
63.6
63.2
-
-
-
63.4
-
63.8
-
-
64.3
-
-
-
-
-
-
65.0
-
-
-
67.5
72.8
-
75.2
Hsd
-505
-536
-567
-602
-668
-722
- 757
-757
-769
-715
-730
-688
-594
-536
-509
-463
-451
-400
-408
-424
-443

Hsd
-
-591
-594
-602
-602
-602
-
-
-
-614
-
-603
-603
-
-535
-
-560
-548
-532
-517
-499
-466
-453
- 470
-459

Hsd
-
-453
-459
-456
-
-
-
-459
-456
-
-457
-469
-
-
-491
-490
-490
-490
-482
-454
-452
-
- 439
-
-403
-369
Gfw
144
128
144
192
232
248
248
600
1232
1392
1364
1264
1000
592
104
120
192
136
152
128
120

Gfw
-
200
201
192
440
640
-
650
677
-
685
685
693
-
697
-
714
832
818
-
-
648
-
416
256

Gfw
-
-
156
113
-
-
-
-
145
-
155
-
125
-
-
138
177
112
170
145
-
-
134
-
-
144
Tfw
235
270
240
210
190
176
-
165
-
-
160
-
170
-
210
-
-
227
-
190
184
Tfw
-
165
-
162
-
159
-
-
-
-
-
-
-
-
-
-
155
-
-
-
-
155
-
-
163

Tfw
-
-
-
-
-
-
-
-
-
-
199
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Tin
279
283
283
283
281
281
-
281
-
-
280
-
280
-
280
-
-
280
-
279
279

Tin
-
281
-
281
-
281
-
-
-
-
-
-
-
-
-
-
281
-
-
-
-
281
-
-
281

Tin
-
-
-
-
-
-
-
-
-
281
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Gmcp1
7.55
7.72
8.15
7.02
7.12
7.65
7.52
6.80
7.05
6.95
7.42
6.77
7.37
7.05
6.72
7.15
7.42
7.45
6.50
7.20
7.00
Gmcp1
-
7.32
7.05
5.92
6.75
6.72
7.16
-
-
7.31
6.78
-
6.98
7.18
7.23
-
6.72
7.42
7.20
-
-
7.15
-
7.15
7.35

Gmcp1
6.50
7.15
7.53
-
7.86
6.53
7.68
6.93
-
7.25
7.10
7.39
6.00
7.20
7.57
7.87
7.42
6.95
6.96
-
-
7.05
7.65
-
4.30
7.75
Gmcp2
0.0
0.0
0.0
6.36
6.55
7.00
6.95
7.25
6.77
6.80
6.67
7.32
7.20
7.10
7.07
6.42
6.57
6.75
6.75
7.17
6.70
Gmcp2
-
6.90
7.12
6.35
6.55
6.77
7.09
-
-
7.51
6.87
-
6.84
7.22
6.98
-
7.12
7.85
7.12
-
-
6.55
-
7.02
6.55
Gmcp2
7.15
6.71
6.80
7.10
6.36
6.68
6.83
6.64
-
6.64
6.78
6.61
7.32
6.61
-
7.00
6.80
7.32
6.72
6.60
-
7.35
6.62
-
4.85
7.95
Gmcp3
7.92
8.12
7.85
7.95
7.55
7.85
7.25
7.94
7.52
7.90
7.27
7.65
7.35
7.75
7.82
7.42
7.85
7.92
7.65
7.90
7.95
Gmcp3
-
7.90
7.80
7.60
7.82
7.27
6.37
-
-
7.26
7.41
-
7.12
7.76
7.05
-
7.80
7.62
7.82
-
-
7.97
-
7.80
7.70
Gmcp3
8.00
-
7.18
-
7.62
-
7.32
-
-
6.82
7.28
6.93
-
6.71
6.50
5.97
6.32
6.65
6.42
6.05
-
5.65
5.97
-

4.77
Gmcp4
7.65
7.05
7.90
7.05
6.82
6.92
7.02
7.17
6.95
6.90
7.10
7.22
7.20
6.75
7.12
7.45
6.77
6.65
7.72
6.97
6.75
Gmcp4
-
7.05
7.25
7.17
7.12
6.92
7.82
-
-
7.64
6.94
-
7.34
7.12
6.90
-
7.05
7.02
7.15
-
-
7.32
-
7.25
7.10
Gmcp4
6.82
6.46
7.36
-
6.64
6.85
6.00
6.39
-
7.00
6.07
-
-
-
6.86
6.07
5.90
5.97
5.45
5.62
-
5.75
5.20
-

4.42

Table B2.
Parametres of MFCC (the right side).

  time
1:00:11
1:01:00
1:02:01
1:03:00
1:04:00
1:05:07
1:05:57
1:06:02
1:06:14
1:06:53
1:07:06
1:07:28
1:08:09
1:08:32
1:09:03
1:09:28
1:09:41
1:10:00
1:10:25
1:11:00
1:12:00

time
1:18:40
1:18:49
1:18:58
1:19:01
1:19:12
1:19:21
1:19:28
1:19:52
1:20:00
1:20:02
1:20:10
1:20:22
1:20:29
1:20:36
1:20:53
1:21:00
1:21:03
1:21:15
1:21:18
1:21:24
1:21:27
1:21:43
1:22:03
1:22:11
1:22:19
1:22:24
1:22:34
1:22:43
1:22:49

time
1:23:00
1:23:02
1:23:04
1:23:06
1:23:07
1:23:09
1:23:11
1:23:13
1:23:14
1:23:15
1:23:17
1:23:19
1:23:21
1:23:23
1:23:27
1:23:30
1:23:31
1:23:32
1:23:36
1:23:39
1:23:41
1:23:43
1:23:45
1:23:47
1:23:48
Psd
69.8
69.4
69.6
69.4
69.0
69.2
69.2
69.2
69.2
69.2
69.0
68.2
66.2
66.0
65.8
66.0
66.6
66.6
67.2
67.6
68.8
Psd
68.3
-
-
-
68.0
68.0
-
-
-
-
-
-
-
-
-
67.2
67.6
67.2
-
-
66.6
-
-
65.6
-
65.2
65.0
-
-
Psd
-
64.6
64.5
64.1
-
-
66.1
-
-
-
-
-
65.8
-
66.0
66.3
-
-
-
68.6
-
-
-
80.1
88.4
Hsd
-168
-199
-230
-230
-253
-238
- 199
-199
-183
-129
-168
-186
-9
+25
+76
+126
+111
+83
+72
+56
+49
Hsd
-
-141
-137
-144
-148
-137
-
-
-
-124
-
-119
-115
-
-55
-
-90
-75
-
-
-63
-65
-
-1
-
+2
+14
+19
-
Hsd
-
37
31
42
-
-
-
-
35
-
28
18
12
-
-
23
27
16
34
30
28
-
21
81
159
Gfw
112
88
112
392
208
208
200
560
1152
936
900
800
464
120
104
112
120
96
112
96
90
Gfw
-
120
-
112
352
560
450
516
581
-
573
581
591
-
587
-
576
576
534
576
720
-
601
-
373
320
144
-
82
Gfw
-
-
73
109
-
-
-
-
120
-
-
98
91
-
-
105
117
128
109
108
-
-
103
116
-
Tfw
228
236
240
235
175
170
-
180
-
-
185
-
190
-
195
-
-
200
-
205
200
Tfw
-
180
-
175
-
170
-
-
-
-
-
-
-
-
-
-
164
-
-
-
-
-
-
167
-
-
168
-
-
Tfw
-
-
-
-
-
-
-
-
-
185
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Tin
282
285
285
285
284
284
-
284
-
-
283
-
283
-
283
-
-
283
-
272
272
Tin
-
281
-
281
-
281
-
-
-
-
-
-
-
-
-
-
281
-
-
-
-
-
-
281
-
-
281
-
-
Tin
-
-
-
-
-
-
-
-
-
281
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Gmcp1
7.45
7.55
7.45
7.95
7.87
7.82
7.62
7.80
7.82
7.65
6.92
7.52
7.50
7.32
7.00
7.32
7.72
7.32
7.47
7.17
7.35
Gmcp1
-
7.22
7.40
7.17
7.15
7.27
-
-
-
7.92
7.38
-
7.12
7.37
7.46
-
7.65
7.25
-
-
7.37
-
-
7.27
-
7.85
7.52
-
-
Gmcp1
-
7.62
7.47
-
7.61
-
-
7.72
-
7.25
7.90
7.57
7.68
7.25
7.57
7.55
7.35
8.12
7.25
7.37
-
7.72
7.37
4.77
7.05
Gmcp2
0.40
0.42
0.47
0.42
0.40
0.42
0.37
0.35
0.40
6.20
6.00
6.37
6.30
6.25
6.14
6.00
6.27
6.10
5.75
5.80
6.22
Gmcp2
-
5.72
5.75
6.32
6.20
5.92
-
-
-
6.32
6.18
-
5.65
6.42
6.85
-
5.97
6.00
-
-
6.18
-
-
6.37
-
6.55
5.97
-
-
Gmcp2
-
-
6.50
-
5.85
-
6.57
-
-
6.60
-
-
6.07
6.65
-
6.57
6.27
6.55
6.12
6.45
-
6.42
6.35
4.02
6.95
Gmcp3
7.80
7.82
7.80
8.05
7.62
7.62
7.85
7.60
7.22
7.42
7.05
7.07
7.10
7.67
7.45
6.87
7.72
7.42
7.62
6.82
7.02
Gmcp3
-
7.65
7.17
7.72
7.67
7.15
-
-
-
7.37
7.52
-
7.02
6.47
7.31
-
7.32
7.22
-
-
7.35
-
-
7.12
-
7.27
7.05
-
-
Gmcp3
7.89
7.42
7.82
-
7.21
-
6.80
7.50
-
6.82
6.82
6.77
6.61
-
6.43
5.65
6.37
6.57
6.02
5.67
-
5.50
5.57

*
Gmcp4
7.02
7.32
6.82
6.95
7.40
7.72
8.17
7.75
8.00
6.72
7.45
7.52
7.55
7.62
7.15
7.52
7.35
7.45
7.45
7.14
6.75
Gmcp4
-
7.37
7.20
7.60
7.05
7.02
-
-
-
7.67
7.07
-
7.22
7.12
7.52
-
6.82
7.67
-
-
7.12
-
-
6.82
-
7.80
7.67
-
-
Gmcp4
7.60
7.82
7.29
7.79
6.73
7.00
-
-
7.40
-
6.57
6.07
-
-
6.18
6.50
5.90
6.07
5.12
5.50
-
5.80
5.40

0.45

2. Discrete parametres.

Besides values of parametres of technological process (analogue parametres), program DREG registers also discrete signals of system of the centralised control (discrete parametres). These are signals about an equipment condition (it is switched on/off), emergency and warning signals about excess of safe limits on what or to technological parameter, etc. Each of such parameter matters either 0 or 1. Value 1 means occurrence of a corresponding signal, and value 0 - its removal.
These discrete signals for each mark of time since the moment of closing ICV are given here below. The code designation of a signal is specified also in the table.

 code valueeventcomment
 
K07L053

K07L203

K10L064


K06L015
K06L042
K06L040
K06L151
K06L146
K07L202
K06L045

K06L017
K06L016
K06L053
K06L052
K06L051
K06L050
K06L047
K06L046
K06L045
K06L044
K07L137
K07L136
K07L131
K07L130
K07L166
K07L165

K07L145
K07L144

K06L040
K06L036
K08L201
K06L176
K06L175
K06L167

K10L045
K10L035

K06L005
K06L041
K06L037
K06L034
K06L176
K06L175
K07L137
K07L136
K07L131
K07L130
K07L167
K07L166
K07L165

1

0

0


1
1
0
1
1
1
1

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1

1
1

1
1
1
1
1


0
1

1
1
1
1
0
0
0
0
0
0
0
0
0
time mark 1:23:04
Isolating valves are closed
time mark 1:23:11
[AR] switching-off on malfunction
time mark 1:23:23
Pressure decrease of water injection
in [KND-1]
time mark 1:23:40
[AZ-5 SUZ]
Unavailability of EPS
[AR2] measuring part is out of order
[P2-1332] regulator is switched on at EPS-5
[P1-1332] regulator is switched on at EPS-5
[AR] switching-off on malfunction
Unloading TG at EPS-5
time mark 1:23:43
[AZSR] (period decrease in the basic range)
[AZM] (power excess in the basic range)
Emergency power excess on 2APP-1
Emergency power excess on 2APP-2
Emergency power excess on 2APP-3
Emergency power excess on 2APP-4
Emergency power excess on 1APP-1
Emergency power excess on 1APP-2
Emergency power excess on 1APP-3
Emergency power excess on 1APP-4
1APP-4 is out of order
1APP-3 is out of order
1APP-2 is out of order
1APP-1 is out of order
2APP-4 is out of order
2APP-3 is out of order
time mark 1:23:44
2APP-2 is out of order
2APP-1 is out of order
time mark 1:23:47
Measuring part of [AR-2] is out of order
Measuring part of [AR-1] is out of order

Pressure excess in the right SD
Pressure excess in the left SD
1APR-12 is out of order
time mark 1:23:48
Unloading TG at EPS-5
[BRUK-1] operation
time mark 1:23:49
Pressure growth in RS
Executive part of [1] is out of order
Executive part of [2] is out of order
There is no voltage of 48 V on 1[SSh]
Pressure excess in the right SD
Pressure excess in the left SD
1APP-4 is out of order
1APP-3 is out of order
1APP-2 is out of order
1APP-1 is out of order
1APR-12 is out of order
2APP-4 is out of order
2APP-3 is out of order

The experiment beginning

[AR] it is put in operation

Pressure is restored


EPS-5 button is pressed
Rods have descend. off TLS
signal removal


[AR] blocking at EPS-5


uncontrolled power excursion
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signal removal


destruction of the TCs



signal removal
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to sitemap