4-1. Neutron Flux
Page 2
16 July 2007 (time arrow pointing in downwards direction)
ch switchover
10:13 earthquake occurs
effect of aftershock
ch switchover
19:40 cold shutdown
10-1 1 10 102 103 104 105 106 (cps)
SRM(A),(C) (red): standard
SRM(B),(D) (green): about 10 minutes delay
Reactor 2 SRM A,B,C,D
Page 3
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(A)(B)
APRM(A) (red): standard
APRM(B) (green): about 10 minutes ahead
Record of IRM(B)(F)
IRM(B) (red): standard
IRM(F) (green ): about 10 minutes ahead
effect of aftershock
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 3 APRM(A)(B)/IRM(B)(F)
Page 4
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(C)(D)
APRM(C) (red): standard
APRM(D) (green): about 10 minutes ahead
Record of IRM(C)(G)
(Switch object of recording from APRM to IRM)
IRM(C) (red): standard
IRM(G) (green ): about 10 minutes ahead
effect of aftershock
23:07 cold shutdown
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 3 APRM(C)(D)/IRM(C)(G)
Page 5
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(E)
APRM(E) (red)
Record of IRM(A)(E)
(Switch object of recording from APRM to IRM)
IRM(A) (red): standard
IRM(E) (green ): about 10 minutes ahead
effect of aftershock
23:07 cold shutdown
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 3 APRM(E)/IRM(A)(E)
Page 6
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(F)
APRM(F) (red)
Record of IRM(D)(H)
(Switch object of recording from APRM to IRM)
IRM(D) (red): standard
IRM(H) (green ): about 10 minutes ahead
effect of aftershock
23:07 cold shutdown
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 3 APRM(F)/IRM(D)(H)
Page 7
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(A)(B)
APRM(A) (red): standard
APRM(B) (green): about 10 minutes ahead
Record of IRM(B)(F)
(Switch object of recording from APRM to IRM)
IRM(B) (red): standard
IRM(F) (green ): about 10 minutes ahead
effect of aftershock
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 4 APRM(A)(B)/IRM(B)(F)
Page 8
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(C)(D)
APRM(C) (red): standard
APRM(D) (green): about 10 minutes ahead
Record of IRM(C)(G)
(Switch object of recording from APRM to IRM)
IRM(C) (red): standard
IRM(G) (green ): about 10 minutes ahead
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 4 APRM(C)(D)/IRM(C)(G)
Page 9
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(E)
APRM(E) (red)
Record of IRM(A)(E)
(Switch object of recording from APRM to IRM)
IRM(A) (red): standard
IRM(E) (green ): about 10 minutes ahead
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 4 APRM(E)/IRM(A)(E)
Page 10
16 July 2007 (time arrow pointing in downwards direction)
10:13 earthquake occurs
Record of APRM(F)
APRM(F) (red)
Record of IRM(D)(H)
(Switch object of recording from APRM to IRM)
IRM(D) (red): standard
IRM(H) (green ): about 10 minutes ahead
APRM 0 25 50 75 100 125 (%)
IRM 0 10 20 30 40 (%)
Reactor 4 APRM(F)/IRM(D)(H)
Page 11
16 July 2007 (time arrow pointing in upwards direction)
1: SRNM(A) change measurement range
(intermediate range to neutron source range)
Record of SRNM(A) (intermediate range)
(Automatic switch of object of recording from APRM to SRNM)
SRNM(A) (red)
Period (green )
Record of APRM(A)
APRM(A) (red)
MRBM(A) (green)
10:13 earthquake occurs
APRM 0 25 50 75 100 125 (%)
SRNM 10-1 1 10 102 103 104 105 106 (cps)
(neutron source range)
Reactor 7 APRM(A)/SRNM(A)
Page 12
16 July 2007 (time arrow pointing in upwards direction)
1: SRNM(B) change measurement range
(intermediate range to neutron source range)
Record of SRNM(B) (intermediate range)
(Automatic switch of object of recording from APRM to SRNM)
SRNM(B) (red)
Period (green )
Record of APRM(B)
APRM(B) (red)
MRBM(A) (green)
10:13 earthquake occurs
APRM 0 25 50 75 100 125 (%)
SRNM 10-1 1 10 102 103 104 105 106 (cps)
(neutron source range)
Reactor 7 APRM(B)/SRNM(B)
Page 13
16 July 2007 (time arrow pointing in upwards direction)
1: SRNM(C) change measurement range
(intermediate range to neutron source range)
Record of SRNM(C) (intermediate range)
(Automatic switch of object of recording from APRM to SRNM)
SRNM(C) (red)
Period (green )
Record of APRM(C)
APRM(C) (red)
MRBM(A) (green)
10:13 earthquake occurs
APRM 0 25 50 75 100 125 (%)
SRNM 10-1 1 10 102 103 104 105 106 (cps)
(neutron source range)
Reactor 7 APRM(C)/SRNM(C)
Page 14
16 July 2007 (time arrow pointing in upwards direction)
1: SRNM(D) change measurement range
(intermediate range to neutron source range)
Record of SRNM(D) (intermediate range)
(Automatic switch of object of recording from APRM to SRNM)
SRNM(D) (red)
Period (green )
Record of APRM(D)
APRM(D) (red)
MRBM(A) (green)
10:13 earthquake occurs
APRM 0 25 50 75 100 125 (%)
SRNM 10-1 1 10 102 103 104 105 106 (cps)
(neutron source range)
Reactor 7 APRM(D)/SRNM(D)