ML19329A796: Difference between revisions
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{{#Wiki_filter:. | {{#Wiki_filter:. | ||
V g | V g | ||
LICENSEE E'. E.' T REPORT CcNinot .toCs l,, L j l l lj . | |||
LICENSEE E'. E.' T REPORT | |||
CcNinot .toCs l,, L j l l lj . | |||
G | G | ||
**t tsCENst Neawot a t'vI ,"[E I,Y,"g' E,lolH I DIB I S ll). . - .sl0 j 61 -1610 ] NlPirl-iGl3] ,, m l 4 ll1 l1l1I h6 Y3 | **t tsCENst Neawot a t'vI ,"[E I,Y,"g' E,lolH I DIB I S ll). . - .sl0 j 61 -1610 ] NlPirl-iGl3] ,, m l 4 ll1 l1l1I h6 Y3 | ||
....oo.. m v e. :: ,,...w... .,,M.,... . .o.,ca., | ....oo.. m v e. :: ,,...w... .,,M.,... . .o.,ca., | ||
con 1 [ { 5 l 0 l .-i 03:4 1 16 16 , 9 : 0 , 7 ,7,7 g 31 30,0 ; 4,7 ;7 (VENT of SC8aPilose g : At 0830 hours on September 7, 1977, while switching from the normal to | con 1 [ { 5 l 0 l .-i 03:4 1 16 16 , 9 : 0 , 7 ,7,7 g 31 30,0 ; 4,7 ;7 (VENT of SC8aPilose g : At 0830 hours on September 7, 1977, while switching from the normal to Suction Valve DH12, the valve 90 | ||
Suction Valve DH12, the valve 90 | |||
, .l,the alternate power supply for Decay Heat J g gclosed. The Reactor Operator immediately re-opened the valve and re- l | , .l,the alternate power supply for Decay Heat J g gclosed. The Reactor Operator immediately re-opened the valve and re- l | ||
> es u 7 | > es u 7 | ||
E. L, established flow at > 2800 GPM. (NP-33-77-74) yn g | E. L, established flow at > 2800 GPM. (NP-33-77-74) yn g | ||
ML i ot tf & CnesPONS NT CoCf sy (A MA UrACT " veot A t tom E. i, ci10s 4 L8J lzizi zizi zizi uz iz i z e z; f 4i (Yj 7 Il 82 37 43 44 4; 4 CAUST otSCRIPfloN j.A design deficiency in the interlock / control circuit caused this l l OccurrenCS. | ML i ot tf & CnesPONS NT CoCf sy (A MA UrACT " veot A t tom E. i, ci10s 4 L8J lzizi zizi zizi uz iz i z e z; f 4i (Yj 7 Il 82 37 43 44 4; 4 CAUST otSCRIPfloN j.A design deficiency in the interlock / control circuit caused this l l OccurrenCS. | ||
s* . | s* . | ||
,3. I, . | ,3. I, . | ||
| Line 55: | Line 37: | ||
t (AJ ds | t (AJ ds | ||
[46NA j 80 J ag u o,# 3"g' $a annoveen or act eysty tocassoN or etttast i | [46NA j 80 J ag u o,# 3"g' $a annoveen or act eysty tocassoN or etttast i | ||
,lZ_J .lyi Z l NA l lNA I | ,lZ_J .lyi Z l NA l lNA I 7 . en a4 46 .0 Pt rtSONNEL EXPQ$UMt$ | ||
7 . en a4 46 .0 Pt rtSONNEL EXPQ$UMt$ | |||
Nuwwe e s vet | Nuwwe e s vet | ||
@> .t.010 ; Oi (zj2 iord.Acaseveo.e I | @> .t.010 ; Oi (zj2 iord.Acaseveo.e I | ||
.. .2 w PtnsoNNELINJUMits l l [ l | .. .2 w PtnsoNNELINJUMits l l [ l | ||
> . l. ,, ,, | > . l. ,, ,, | ||
. l | . l OF FSITE Com$touf NCES \ | ||
OF FSITE Com$touf NCES \ | |||
, LOSS on oAwaGL to FActLITY - | , LOSS on oAwaGL to FActLITY - | ||
' fvre ots;.mie n tose | ' fvre ots;.mie n tose | ||
| Line 73: | Line 51: | ||
. gn a | . gn a | ||
Nj' st | Nj' st | ||
= | = | ||
i ! | i ! | ||
\ | \ | ||
8'*** | 8'*** | ||
Stan Batch (4197 ' 259-5000, Ext . 235 | Stan Batch (4197 ' 259-5000, Ext . 235 re.o=c. ; | ||
re.o=c. ; | |||
I I D7R 135-1 . | I I D7R 135-1 . | ||
l l | l l | ||
8001150 $ Y | 8001150 $ Y | ||
.~ . | .~ . | ||
TOLEDO EDISON COMPANY | TOLEDO EDISON COMPANY | ||
: a. DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION | : a. DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION | ||
^ | ^ | ||
SUPPLEMENTAL INFORMATION RR,LE_R_NP-33-77-74 | SUPPLEMENTAL INFORMATION RR,LE_R_NP-33-77-74 DATE OF EVENT: September 7, 1977 , | ||
DATE OF EVENT: September 7, 1977 , | |||
l FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Reactor Coolant flow less than 2800 gallons per minute. | l FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Reactor Coolant flow less than 2800 gallons per minute. | ||
Conditions Prior to Occurrence: Iha plant was in'Moda-5, with Power (MWT) = 0 and Load (MWE) = 0. Reactor Coolant Systustpressure a u -arely 100 psig. | Conditions Prior to Occurrence: Iha plant was in'Moda-5, with Power (MWT) = 0 and Load (MWE) = 0. Reactor Coolant Systustpressure a u -arely 100 psig. | ||
| Line 116: | Line 70: | ||
.__ . valve DH12 to the alternate power supply (MCC Fila), DH12 closed. The Reactor ._ | .__ . valve DH12 to the alternate power supply (MCC Fila), DH12 closed. The Reactor ._ | ||
Operator re-opened the valve as soon as it stroked closed. When DH 12 closed . _ | Operator re-opened the valve as soon as it stroked closed. When DH 12 closed . _ | ||
to prevent a 2800 GPM flow rate, Decay Heat Pump 1-1 was started which took suction from the Borated Water Storage Tank. The Decay Heat Flow was less than 2800 GPM for only a few seconds, but for that-time the station was in violation of Techni- | to prevent a 2800 GPM flow rate, Decay Heat Pump 1-1 was started which took suction from the Borated Water Storage Tank. The Decay Heat Flow was less than 2800 GPM for only a few seconds, but for that-time the station was in violation of Techni-cal Specification 3.1.1.2. | ||
cal Specification 3.1.1.2. | |||
When DR Pump 1-2 was again recirculating greater than 2800 GPM, DH Pump 1-1 was stopped. Pressurizer water level had increased from 255 inches to 285 inches due to the water that was pumped from the. Borated Water Storage Tank by DH Pump 1-1. | When DR Pump 1-2 was again recirculating greater than 2800 GPM, DH Pump 1-1 was stopped. Pressurizer water level had increased from 255 inches to 285 inches due to the water that was pumped from the. Borated Water Storage Tank by DH Pump 1-1. | ||
Designation of Apparent Cause of Occurrence: The apparent cause of this occurrence is a design problem in the circuit which interlocks and controls the motor operator of DH12. This caused the valve to close during the transfer of power from its normal to its alternate power supply. The closure of the suction valve caused p decay heat-flow to be less than 2800 GPM. | Designation of Apparent Cause of Occurrence: The apparent cause of this occurrence is a design problem in the circuit which interlocks and controls the motor operator of DH12. This caused the valve to close during the transfer of power from its normal to its alternate power supply. The closure of the suction valve caused p decay heat-flow to be less than 2800 GPM. | ||
Analysis of Occurrence: There was na dangar to.the health sud safety of the public or to station personnel. Decay East flour was . lass than 2800 GPM for only a few seconds. | Analysis of Occurrence: There was na dangar to.the health sud safety of the public or to station personnel. Decay East flour was . lass than 2800 GPM for only a few seconds. | ||
l Corrective Action:~ Facility Change Request, 77-034 has been approved which requests a control circuit. change to DH 11. A Maintenance Work Order has been written to incorporate this change. Since DH12 is the only suction valve with this wiring | l Corrective Action:~ Facility Change Request, 77-034 has been approved which requests a control circuit. change to DH 11. A Maintenance Work Order has been written to incorporate this change. Since DH12 is the only suction valve with this wiring arrangement, this wiring change should prevent recurrence. | ||
arrangement, this wiring change should prevent recurrence. | |||
Failure Data: There have been four previous closures of a DH suction valve, | Failure Data: There have been four previous closures of a DH suction valve, | ||
) | ) | ||
NP-32-77-2, NP-32-77-3, NP-32-77-5 and NP-32-77-9, but none of these were caused ; | NP-32-77-2, NP-32-77-3, NP-32-77-5 and NP-32-77-9, but none of these were caused ; | ||
v i by the design deficiency in the control circuit. I | v i by the design deficiency in the control circuit. I | ||
.-m | .-m | ||
, ., ., , _ ,,y,9 , , , _., - , , _.,_g.,. , , | , ., ., , _ ,,y,9 , , , _., - , , _.,_g.,. , , | ||
* ------=gy'wy y .- ;-..,,9--,,,,.g7}} | * ------=gy'wy y .- ;-..,,9--,,,,.g7}} | ||
Latest revision as of 21:50, 31 January 2020
| ML19329A796 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/04/1977 |
| From: | Batch S TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329A788 | List: |
| References | |
| NUDOCS 8001150695 | |
| Download: ML19329A796 (2) | |
Text
.
V g
LICENSEE E'. E.' T REPORT CcNinot .toCs l,, L j l l lj .
G
- t tsCENst Neawot a t'vI ,"[E I,Y,"g' E,lolH I DIB I S ll). . - .sl0 j 61 -1610 ] NlPirl-iGl3] ,, m l 4 ll1 l1l1I h6 Y3
....oo.. m v e. :: ,,...w... .,,M.,... . .o.,ca.,
con 1 [ { 5 l 0 l .-i 03:4 1 16 16 , 9 : 0 , 7 ,7,7 g 31 30,0 ; 4,7 ;7 (VENT of SC8aPilose g : At 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> on September 7, 1977, while switching from the normal to Suction Valve DH12, the valve 90
, .l,the alternate power supply for Decay Heat J g gclosed. The Reactor Operator immediately re-opened the valve and re- l
> es u 7
E. L, established flow at > 2800 GPM. (NP-33-77-74) yn g
ML i ot tf & CnesPONS NT CoCf sy (A MA UrACT " veot A t tom E. i, ci10s 4 L8J lzizi zizi zizi uz iz i z e z; f 4i (Yj 7 Il 82 37 43 44 4; 4 CAUST otSCRIPfloN j.A design deficiency in the interlock / control circuit caused this l l OccurrenCS.
s* .
,3. I, .
.o l
- "sEINs' s s ' ovsetastatus os$oNa w osscovtav netseniPtioM
> a i
b 9
lto 0 0"I l [NA 62 IJ **
t (AJ ds
[46NA j 80 J ag u o,# 3"g' $a annoveen or act eysty tocassoN or etttast i
,lZ_J .lyi Z l NA l lNA I 7 . en a4 46 .0 Pt rtSONNEL EXPQ$UMt$
Nuwwe e s vet
@> .t.010 ; Oi (zj2 iord.Acaseveo.e I
.. .2 w PtnsoNNELINJUMits l l [ l
> . l. ,, ,,
. l OF FSITE Com$touf NCES \
, LOSS on oAwaGL to FActLITY -
' fvre ots;.mie n tose
@>i-.tz J LNA -
1 PUGLICifv i
l
. i, NA ,o ADOstloNAL 8 ACions l
. gn a
Nj' st
=
i !
\
8'***
Stan Batch (4197 ' 259-5000, Ext . 235 re.o=c. ;
I I D7R 135-1 .
l l
8001150 $ Y
.~ .
TOLEDO EDISON COMPANY
- a. DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION
^
SUPPLEMENTAL INFORMATION RR,LE_R_NP-33-77-74 DATE OF EVENT: September 7, 1977 ,
l FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Reactor Coolant flow less than 2800 gallons per minute.
Conditions Prior to Occurrence: Iha plant was in'Moda-5, with Power (MWT) = 0 and Load (MWE) = 0. Reactor Coolant Systustpressure a u -arely 100 psig.
Description of Occurrence: At 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br /> on September 7, 1977, while switching the normal power supply (MCC E113) for the Decay Heat (DH) suction motor operated
.__ . valve DH12 to the alternate power supply (MCC Fila), DH12 closed. The Reactor ._
Operator re-opened the valve as soon as it stroked closed. When DH 12 closed . _
to prevent a 2800 GPM flow rate, Decay Heat Pump 1-1 was started which took suction from the Borated Water Storage Tank. The Decay Heat Flow was less than 2800 GPM for only a few seconds, but for that-time the station was in violation of Techni-cal Specification 3.1.1.2.
When DR Pump 1-2 was again recirculating greater than 2800 GPM, DH Pump 1-1 was stopped. Pressurizer water level had increased from 255 inches to 285 inches due to the water that was pumped from the. Borated Water Storage Tank by DH Pump 1-1.
Designation of Apparent Cause of Occurrence: The apparent cause of this occurrence is a design problem in the circuit which interlocks and controls the motor operator of DH12. This caused the valve to close during the transfer of power from its normal to its alternate power supply. The closure of the suction valve caused p decay heat-flow to be less than 2800 GPM.
Analysis of Occurrence: There was na dangar to.the health sud safety of the public or to station personnel. Decay East flour was . lass than 2800 GPM for only a few seconds.
l Corrective Action:~ Facility Change Request,77-034 has been approved which requests a control circuit. change to DH 11. A Maintenance Work Order has been written to incorporate this change. Since DH12 is the only suction valve with this wiring arrangement, this wiring change should prevent recurrence.
Failure Data: There have been four previous closures of a DH suction valve,
)
NP-32-77-2, NP-32-77-3, NP-32-77-5 and NP-32-77-9, but none of these were caused ;
v i by the design deficiency in the control circuit. I
.-m
, ., ., , _ ,,y,9 , , , _., - , , _.,_g.,. , ,
- ------=gy'wy y .- ;-..,,9--,,,,.g7