ML19326A558: Difference between revisions
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=Text= | =Text= | ||
{{#Wiki_filter:. | {{#Wiki_filter:. | ||
Q . | Q . | ||
^ | ^ | ||
~ ~ | ~ ~ | ||
/N LICENSEE EVENT REPORT | /N LICENSEE EVENT REPORT | ||
) | ) | ||
\L . | \L . | ||
CourRot stoCa Lj i i I I c. | CourRot stoCa Lj i i I I c. | ||
$ "e2s "* | $ "e2s "* | ||
| Line 36: | Line 29: | ||
* v e"t' E]IoIMIDIBiS11Jie - l6 j 01 -1 Ol01 NI PIF 1-10 ? 3l l4 l11 J l ilj;c 5g.,$ I l is a x. | * v e"t' E]IoIMIDIBiS11Jie - l6 j 01 -1 Ol01 NI PIF 1-10 ? 3l l4 l11 J l ilj;c 5g.,$ I l is a x. | ||
....oo.v- m:' :....m | ....oo.v- m:' :....m | ||
.....u... .. ... ,,... ...o..o... | .....u... .. ... ,,... ...o..o... | ||
g [ g 10151 0 ..t 0341 1 11 6 1017 21617171 Of 81191 77 i | g [ g 10151 0 ..t 0341 1 11 6 1017 21617171 Of 81191 77 i | ||
.% Coat ( . . .. ,, | .% Coat ( . . .. ,, | ||
1 | 1 tvtwr ot SCaiPriou . | ||
gl | gl | ||
; as Deliberately place,d SFAS Channel 3 RCS Pressure in Test Tripl Byoass for j | ; as Deliberately place,d SFAS Channel 3 RCS Pressure in Test Tripl Byoass for j | ||
| Line 51: | Line 39: | ||
so Q I into the Action Statement of Technical Specification 3.3.2.1. l 1 es u gl OIP-33-77-25) . | so Q I into the Action Statement of Technical Specification 3.3.2.1. l 1 es u gl OIP-33-77-25) . | ||
I 7 89 ;m | I 7 89 ;m | ||
@L I | @L I d" (n"n't CowenNe ws coor "Eu s ( n"' waTu"s*a"c"v'u"n'r e vios areow 81 I I at [Ej IRIEILI AlYlXI LAJ IC l 5 I6 l 01 QJ 7 a3 to et 82 87 el se el 44 CAust ottCnwsnON gl Deliberately entered Action Statenant to replace defective relay. l dl' Design change being investigated by vendor to prevent recurrence. " | ||
CAust ottCnwsnON gl Deliberately entered Action Statenant to replace defective relay. l dl' Design change being investigated by vendor to prevent recurrence. " | |||
m a es ao | m a es ao | ||
, . I, | , . I, | ||
* I | * I | ||
.a | .a g s EYu's s powe a os see's status ui $$ av osSCovc av OE%Castf 80tf | ||
@7 0 (Ej | @7 0 (Ej | ||
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| Line 66: | Line 50: | ||
4 NA _J 80 of D os e E aucume or aC?systv LOCatsome or at LE ASC | 4 NA _J 80 of D os e E aucume or aC?systv LOCatsome or at LE ASC | ||
'8 3 8 9 l3J . 1-Zj iNA to 51 4e I l NA 45 80 l | '8 3 8 9 l3J . 1-Zj iNA to 51 4e I l NA 45 80 l | ||
Ptit5oPeNEL t aroSURES l 9 3g l l l es l | Ptit5oPeNEL t aroSURES l 9 3g l l l es l si .2 ia 60 PtnSoNNtt INJun45 NuMot t OLSc e**f tCM 8.1.,.0_[ 0 ] .. | ||
si .2 ia 60 PtnSoNNtt INJun45 NuMot t OLSc e**f tCM | |||
8.1.,.0_[ 0 ] .. | |||
2 O f iu NA l | 2 O f iu NA l | ||
, ao of f seTE con $tcutesCts is ( NA 3 ts I a2 | , ao of f seTE con $tcutesCts is ( NA 3 ts I a2 | ||
* LoS5 oH o&ameAtit To f ACILif V vvet ossemies.o 8* Z t NA ** | * LoS5 oH o&ameAtit To f ACILif V vvet ossemies.o 8* Z t NA ** | ||
l t b . ar - | l t b . ar - | ||
PUB LICIT V | PUB LICIT V | ||
* 31 3 e3 NA ** | * 31 3 e3 NA ** | ||
l 33 ADOstloN AL , ACTQR$ | l 33 ADOstloN AL , ACTQR$ | ||
31 Relay provides contacts for indication oniv. ' | 31 Relay provides contacts for indication oniv. ' | ||
| Line 84: | Line 62: | ||
h 31ee l | h 31ee l | ||
/ | / | ||
vj co | vj co | ||
'8 88AM Jacque Lingenfelter/Stan Batch (419 p W 5000, Ext. 231 g PMoN E . | '8 88AM Jacque Lingenfelter/Stan Batch (419 p W 5000, Ext. 231 g PMoN E . | ||
e T | e T | ||
* 8002040 M . .. ,, .. | |||
8002040 M . .. ,, .. | |||
-. l | -. l | ||
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(j\ TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE !P'iU POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-25 DATE OF EVENT: July 26, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Placed SFAS Channel 3 RCS Pressure in Test Trip Bypass (TTEP) to replace a defective relay. | |||
7-^ | |||
(j\ TOLEDO EDISON COMPANY | |||
DAVIS-BESSE UNIT ONE !P'iU POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-25 DATE OF EVENT: July 26, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Placed SFAS Channel 3 RCS Pressure in Test Trip Bypass (TTEP) to replace a defective relay. | |||
Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0. | Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0. | ||
Description of Occurrence: On July 26, 1977, at 0305 hours, Safety Features Actuation System (SFAS) Channel 3 Reactor Coolant System (RCS) Pressure was placed in Test Trip Bypass (TTBP) to replace a defective relay. This placed the station into the Action Statement of Technical Specification 3.3.2.1. The relay (K4 on BA305 Bistable) controls indication for a " BLOCK" light in the Control Room only, and is not used to actuate equipment. The work was perfor ei s | Description of Occurrence: On July 26, 1977, at 0305 hours, Safety Features Actuation System (SFAS) Channel 3 Reactor Coolant System (RCS) Pressure was placed in Test Trip Bypass (TTBP) to replace a defective relay. This placed the station into the Action Statement of Technical Specification 3.3.2.1. The relay (K4 on BA305 Bistable) controls indication for a " BLOCK" light in the Control Room only, and is not used to actuate equipment. The work was perfor ei s | ||
g under Maintenance Work Order MWO 376-77. Work was completed and SFAS Channel ? | g under Maintenance Work Order MWO 376-77. Work was completed and SFAS Channel ? | ||
; RCS Pressure was removed from Test Trip Bypass at 0325 hours on July 26, 1977. | ; RCS Pressure was removed from Test Trip Bypass at 0325 hours on July 26, 1977. | ||
Designation of Apparent Cause of Occurrence: The station deliherately entered the Action Statement of Technical Specification 3.3.2.1 to repisce the defec-tive relay. To prevent recurrence of the relay failure, the vendce, Consolidated | Designation of Apparent Cause of Occurrence: The station deliherately entered the Action Statement of Technical Specification 3.3.2.1 to repisce the defec-tive relay. To prevent recurrence of the relay failure, the vendce, Consolidated Controls, is investigating a design change. | ||
Controls, is investigating a design change. | |||
~ | ~ | ||
Analysis of Occurrence: Since SFAS Channel 3 RCS Pressure was placed in Test ' | Analysis of Occurrence: Since SFAS Channel 3 RCS Pressure was placed in Test ' | ||
Trip Bypass, and since the other three channels were operable, the SFAS would operate if required under accident conditions. Therefore, no threat occurred to the health and safety of the public or to station personnel. | Trip Bypass, and since the other three channels were operable, the SFAS would operate if required under accident conditions. Therefore, no threat occurred to the health and safety of the public or to station personnel. | ||
Corrective Action: The relay was replaced within twenty (20) minutes and the channel removed from Test Trip Bypass. Facility Change Request FCR 77-104, written on June 23, 1977, requested a design change to prevent relay failure. | Corrective Action: The relay was replaced within twenty (20) minutes and the channel removed from Test Trip Bypass. Facility Change Request FCR 77-104, written on June 23, 1977, requested a design change to prevent relay failure. | ||
Consolidated Controls is currently investigating a design change to identical relays in the SFAS to prevent recurrence. | Consolidated Controls is currently investigating a design change to identical relays in the SFAS to prevent recurrence. | ||
Failure Data: No previous similar events have occurred. | Failure Data: No previous similar events have occurred. | ||
'/ | '/ | ||
U | U 9 | ||
9 | |||
-,-}} | -,-}} | ||
Latest revision as of 00:15, 1 February 2020
| ML19326A558 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/19/1977 |
| From: | Batch S, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19326A541 | List: |
| References | |
| NUDOCS 8002040727 | |
| Download: ML19326A558 (2) | |
Text
.
Q .
^
~ ~
/N LICENSEE EVENT REPORT
)
\L .
CourRot stoCa Lj i i I I c.
$ "e2s "*
Lect =tt Nisadot a 1 *L
- v e"t' E]IoIMIDIBiS11Jie - l6 j 01 -1 Ol01 NI PIF 1-10 ? 3l l4 l11 J l ilj;c 5g.,$ I l is a x.
....oo.v- m:' :....m
.....u... .. ... ,,... ...o..o...
g [ g 10151 0 ..t 0341 1 11 6 1017 21617171 Of 81191 77 i
.% Coat ( . . .. ,,
1 tvtwr ot SCaiPriou .
gl
- as Deliberately place,d SFAS Channel 3 RCS Pressure in Test Tripl Byoass for j
, w g l twenty minutes to replace a defective relay. This placed the station ;
i ss .
so Q I into the Action Statement of Technical Specification 3.3.2.1. l 1 es u gl OIP-33-77-25) .
I 7 89 ;m
@L I d" (n"n't CowenNe ws coor "Eu s ( n"' waTu"s*a"c"v'u"n'r e vios areow 81 I I at [Ej IRIEILI AlYlXI LAJ IC l 5 I6 l 01 QJ 7 a3 to et 82 87 el se el 44 CAust ottCnwsnON gl Deliberately entered Action Statenant to replace defective relay. l dl' Design change being investigated by vendor to prevent recurrence. "
m a es ao
, . I,
- I
.a g s EYu's s powe a os see's status ui $$ av osSCovc av OE%Castf 80tf
@7 0 (Ej
?
ino0 i Of 0 t iNA n2 IJ- **
I (Zj 42 [%
4 NA _J 80 of D os e E aucume or aC?systv LOCatsome or at LE ASC
'8 3 8 9 l3J . 1-Zj iNA to 51 4e I l NA 45 80 l
Ptit5oPeNEL t aroSURES l 9 3g l l l es l si .2 ia 60 PtnSoNNtt INJun45 NuMot t OLSc e**f tCM 8.1.,.0_[ 0 ] ..
2 O f iu NA l
, ao of f seTE con $tcutesCts is ( NA 3 ts I a2
- LoS5 oH o&ameAtit To f ACILif V vvet ossemies.o 8* Z t NA **
l t b . ar -
PUB LICIT V
- 31 3 e3 NA **
l 33 ADOstloN AL , ACTQR$
31 Relay provides contacts for indication oniv. '
I es a>
h 31ee l
/
vj co
'8 88AM Jacque Lingenfelter/Stan Batch (419 p W 5000, Ext. 231 g PMoN E .
e T
- 8002040 M . .. ,, ..
-. l
, s
- s 7-^
(j\ TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE !P'iU POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-25 DATE OF EVENT: July 26, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Placed SFAS Channel 3 RCS Pressure in Test Trip Bypass (TTEP) to replace a defective relay.
Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0.
Description of Occurrence: On July 26, 1977, at 0305 hours0.00353 days <br />0.0847 hours <br />5.042989e-4 weeks <br />1.160525e-4 months <br />, Safety Features Actuation System (SFAS) Channel 3 Reactor Coolant System (RCS) Pressure was placed in Test Trip Bypass (TTBP) to replace a defective relay. This placed the station into the Action Statement of Technical Specification 3.3.2.1. The relay (K4 on BA305 Bistable) controls indication for a " BLOCK" light in the Control Room only, and is not used to actuate equipment. The work was perfor ei s
g under Maintenance Work Order MWO 376-77. Work was completed and SFAS Channel ?
- RCS Pressure was removed from Test Trip Bypass at 0325 hours0.00376 days <br />0.0903 hours <br />5.373677e-4 weeks <br />1.236625e-4 months <br /> on July 26, 1977.
Designation of Apparent Cause of Occurrence: The station deliherately entered the Action Statement of Technical Specification 3.3.2.1 to repisce the defec-tive relay. To prevent recurrence of the relay failure, the vendce, Consolidated Controls, is investigating a design change.
~
Analysis of Occurrence: Since SFAS Channel 3 RCS Pressure was placed in Test '
Trip Bypass, and since the other three channels were operable, the SFAS would operate if required under accident conditions. Therefore, no threat occurred to the health and safety of the public or to station personnel.
Corrective Action: The relay was replaced within twenty (20) minutes and the channel removed from Test Trip Bypass. Facility Change Request FCR 77-104, written on June 23, 1977, requested a design change to prevent relay failure.
Consolidated Controls is currently investigating a design change to identical relays in the SFAS to prevent recurrence.
Failure Data: No previous similar events have occurred.
'/
U 9
-,-