ML19211C766: Difference between revisions
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o 3 l Special Test, the charcoal filter bank in EVS Unit 1-1 failed to meet the efficiency o 4 l11mit as required by T.S. 3/4.6.5.1 while in Modes 1 thru 4. Being in Mode 5 at the J o 5 time of the finding, the station did not enter an action statement. This is being l j | o 3 l Special Test, the charcoal filter bank in EVS Unit 1-1 failed to meet the efficiency o 4 l11mit as required by T.S. 3/4.6.5.1 while in Modes 1 thru 4. Being in Mode 5 at the J o 5 time of the finding, the station did not enter an action statement. This is being l j | ||
o 6 l reported to document a ec- ponent failure. There was no danger to the health and _ | o 6 l reported to document a ec- ponent failure. There was no danger to the health and _ | ||
o 7 l safety of the public or station personnel. The redundant EVS Train 1-2 was operable l | o 7 l safety of the public or station personnel. The redundant EVS Train 1-2 was operable l 0 a had it been required. (NP-33-7 9-149) 7 8 9 COVP. VALVE S Y S TE *.f CAUSE CAUSE CODE SUBCODE COYPONENT CODE SUBCODE SUBCODE COOE O 9 lSlHl@ lE @ l Bl@ l Bl f3 Ll 0] Wl El R]h Id W@ [Z_j @ | ||
0 a had it been required. (NP-33-7 9-149) 7 8 9 COVP. VALVE S Y S TE *.f CAUSE CAUSE CODE SUBCODE COYPONENT CODE SUBCODE SUBCODE COOE O 9 lSlHl@ lE @ l Bl@ l Bl f3 Ll 0] Wl El R]h Id W@ [Z_j @ | |||
19 20 8 9 la if 12 7 | 19 20 8 9 la if 12 7 | ||
OCCUR R E r.CE REPORT HEVISION SEQU E N T I AL. | OCCUR R E r.CE REPORT HEVISION SEQU E N T I AL. | ||
| Line 36: | Line 34: | ||
lL l 30 l-l 31 W32 | lL l 30 l-l 31 W32 | ||
_ 21 21 23 ATT ACHY ENT NPRD-4 PRIVE COMP. COVPCNfvT ACTI% FUTUcE [FFECT S H U T Dr : .' ."J SU FPLI E R MANUFACTUNEH TAKE'. A C i t rA ONPLANT YETHUD HOURS SUBUITTED F OH M :,Utt Zlg [ 0l 0l 0 j@ lA j@ lB 0 l 7 l 5 lg | _ 21 21 23 ATT ACHY ENT NPRD-4 PRIVE COMP. COVPCNfvT ACTI% FUTUcE [FFECT S H U T Dr : .' ."J SU FPLI E R MANUFACTUNEH TAKE'. A C i t rA ONPLANT YETHUD HOURS SUBUITTED F OH M :,Utt Zlg [ 0l 0l 0 j@ lA j@ lB 0 l 7 l 5 lg | ||
[B jg]4g JJ | [B jg]4g JJ J h Jo Zl@ 31 40 l l Yl@ | ||
J h Jo Zl@ 31 40 l l Yl@ | |||
41 42 43 44 4/ | 41 42 43 44 4/ | ||
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o [The cause of the low filter efficiency was leakage between the filter plate and the I | CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o [The cause of the low filter efficiency was leakage between the filter plate and the I | ||
!ilij jassembly. This leakage was due to insuf ficient pressure applied to the gasket. | !ilij jassembly. This leakage was due to insuf ficient pressure applied to the gasket. | ||
g,17llUnder Maintenance Work Order 79-3756, the nuts holding the plate were torqued to i 3 75 in-lbs. The unit then successfully met the requirements of ST 5067.02 on l I | g,17llUnder Maintenance Work Order 79-3756, the nuts holding the plate were torqued to i 3 75 in-lbs. The unit then successfully met the requirements of ST 5067.02 on l I | ||
liI41 l December 17, 1979. 80 7 8 9 DISCOV H DISCOVETlY OECCRIPTIqN ST A S %POV.En OTHER STATUS test limit l liIsl | liI41 l December 17, 1979. 80 7 8 9 DISCOV H DISCOVETlY OECCRIPTIqN ST A S %POV.En OTHER STATUS test limit l liIsl W @ l0l_0 0 | ||
@l NA l | |||
W @ l0l_0 | Bl@lUnabletomeet AC TiviTY COYTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE RELE ASTD OF PELE ASE | ||
@l | |||
NA | |||
l | |||
AC TiviTY COYTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE RELE ASTD OF PELE ASE | |||
_ Q lZ @ y@l NA l l NA 80 l | _ Q lZ @ y@l NA l l NA 80 l | ||
8 9 10 11 44 45 7 | 8 9 10 11 44 45 7 | ||
PERSONNEL FRPOSURES NUYBER TYPE DESCRIPTION ~ | PERSONNEL FRPOSURES NUYBER TYPE DESCRIPTION ~ | ||
N^ l lu | N^ l lu d' I010l01@lZl@l unSONNEl'ImuL S Nuv.ER DoSCR,PTiON@ | ||
l li la l8 1010 l '01@l NA q qc B0 1l/j pl J 9 it i2 7 | |||
d' I010l01@lZl@l | |||
l li la l8 1010 l '01@l NA q qc B0 1l/j pl J | |||
9 it i2 7 | |||
j{J LOSS OF OR OAVAGE TO FACILITY h TYPE DE SCHIP TION %./ | j{J LOSS OF OR OAVAGE TO FACILITY h TYPE DE SCHIP TION %./ | ||
l i 9 tl 9 W@l 10 NA go 7 | l i 9 tl 9 W@l 10 NA go 7 | ||
2 n istuEl @oYs'CnipIioN NA @ l 68 69 lllll l ll l lj 80 g 7 8 9 10 O 08 419-259-5000, Ext. 235 DVR 79-195' NAME OF PREPARER. | 2 n istuEl @oYs'CnipIioN NA @ l 68 69 lllll l ll l lj 80 g 7 8 9 10 O 08 419-259-5000, Ext. 235 DVR 79-195' NAME OF PREPARER. | ||
Y | Y | ||
* PHONE: | * PHONE: | ||
e- | e-h001140 % { g | ||
h001140 % { g | |||
. s TOLEDO EDISON COMPANY DAVIS-BESSE UUCLEAR POWER STATION UNIT ONE SUPPLE'4 ENTAL INFORMATION FOR LER MP-33-79-149 DATE OF EVENT: December 10, 1979 | . s TOLEDO EDISON COMPANY DAVIS-BESSE UUCLEAR POWER STATION UNIT ONE SUPPLE'4 ENTAL INFORMATION FOR LER MP-33-79-149 DATE OF EVENT: December 10, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Emergency Ventilation System (EVS) 1-1 Charcoal Bank | ||
FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Emergency Ventilation System (EVS) 1-1 Charcoal Bank | |||
#2 F19-1 C-2 leakage 4 | #2 F19-1 C-2 leakage 4 | ||
Conditions Prior to Occurrence: The unit was in Mode 5, with Power (MWT) = 0, and Load (Gross MWE) = 0. | Conditions Prior to Occurrence: The unit was in Mode 5, with Power (MWT) = 0, and Load (Gross MWE) = 0. | ||
Description of Occurrence: While performing ST 5067.02, EVS 18 Month or Special Test, the charcoal filter bank in the EVS Unit 1-1 (F19-1, C2) failed to meet ST 5067.02 Acceptance Criteria 7.1 (i.e., the charcoal bank capable of removing 2L 99% of the halogenated hydrocarbon refrigerant test gas with 8000 cfm + 10% of air flow). Since the station was in Mode 5 at the time of the event, the unit did not enter an action statement. This is being reported as documentation of a component failure. | Description of Occurrence: While performing ST 5067.02, EVS 18 Month or Special Test, the charcoal filter bank in the EVS Unit 1-1 (F19-1, C2) failed to meet ST 5067.02 Acceptance Criteria 7.1 (i.e., the charcoal bank capable of removing 2L 99% of the halogenated hydrocarbon refrigerant test gas with 8000 cfm + 10% of air flow). Since the station was in Mode 5 at the time of the event, the unit did not enter an action statement. This is being reported as documentation of a component failure. | ||
Designation of Apparent Cause of Occurrence: The cause of the low filter efficiency was leakage located between the filter plate and assembly. Leakage was due to in-sufficient plate / assembly pressure applied to the gaskets which may have been induced by normal vibration. | Designation of Apparent Cause of Occurrence: The cause of the low filter efficiency was leakage located between the filter plate and assembly. Leakage was due to in-sufficient plate / assembly pressure applied to the gaskets which may have been induced by normal vibration. | ||
Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The unit was in Mode 5, the redundant EVS Train 1-2 was operable, and there was no fuel in the spent fuel pool. | Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The unit was in Mode 5, the redundant EVS Train 1-2 was operable, and there was no fuel in the spent fuel pool. | ||
Corrective Action: The nuts of the filter cells were torqued under Maintenance Work Order 79-3756 on December 17, 1979. This provided the necessary seal. On December 17, 1979, ST 5067.02 was performed successfully. A procedure change will be made to prevent similar occurrences by requiring that the nuts to the filter cells be torqued to 75 in-lbs and a light source leak test be performed following the removal and re-assembly of the filter. This ST 5067.02, EVS 18 Month or Special Test, is always used following any EVS work to ensure operability af ter maintenance. | Corrective Action: The nuts of the filter cells were torqued under Maintenance Work Order 79-3756 on December 17, 1979. This provided the necessary seal. On December 17, 1979, ST 5067.02 was performed successfully. A procedure change will be made to prevent similar occurrences by requiring that the nuts to the filter cells be torqued to 75 in-lbs and a light source leak test be performed following the removal and re-assembly of the filter. This ST 5067.02, EVS 18 Month or Special Test, is always used following any EVS work to ensure operability af ter maintenance. | ||
Failure Data: There have been no previous similar reportable occurrences. | Failure Data: There have been no previous similar reportable occurrences. | ||
LER #79-128 '. ,2 6 1740 | LER #79-128 '. ,2 6 1740 | ||
%}} | %}} | ||
Latest revision as of 04:47, 2 February 2020
| ML19211C766 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/08/1980 |
| From: | Bernard Thomas TOLEDO EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19211C763 | List: |
| References | |
| LER-79-128-03L, LER-79-128-3L, NUDOCS 8001140462 | |
| Download: ML19211C766 (2) | |
Text
,,o (1 71)
LICENSEE EVENT REPORT CONTnot BLOCx: l l l l_l l (PLEASE PRINT OR TYPE ALL REQUIRED INFOHMATION) lo lil lO ] H j D l B l S l 1 l@l 0l 0l -lLICENSE 0l 0 NVYdLH Nl Pl Fl -l 0] 31GL4l h 2ti 1l 1l 1l 1 @l57 L Al T bdl@
UCt.NSE T v FE JG 7 8 9 LLCCP.SE E CODE I4 M CON'T o i yn]
s l Lj@l 0 l 5 l 0 l- l 0 l 3 l 4 l 6 j@!1 M b3 l 2 ]1 l0 l 7 l 9 !@l 0h l 1REPORT EVENT OATE 14 l 0 l D8ATEl 8 l 0tiJ l@
i 8 L0 t> 1 DOCK E T ?.UMB EM EVENT DESCRIPTION AND FROBABLE CONSEQUENCES h l
O 2 l During the performance of ST 5067.02, Emergency Ventilation System (EVS) 18 Month or l
o 3 l Special Test, the charcoal filter bank in EVS Unit 1-1 failed to meet the efficiency o 4 l11mit as required by T.S. 3/4.6.5.1 while in Modes 1 thru 4. Being in Mode 5 at the J o 5 time of the finding, the station did not enter an action statement. This is being l j
o 6 l reported to document a ec- ponent failure. There was no danger to the health and _
o 7 l safety of the public or station personnel. The redundant EVS Train 1-2 was operable l 0 a had it been required. (NP-33-7 9-149) 7 8 9 COVP. VALVE S Y S TE *.f CAUSE CAUSE CODE SUBCODE COYPONENT CODE SUBCODE SUBCODE COOE O 9 lSlHl@ lE @ l Bl@ l Bl f3 Ll 0] Wl El R]h Id W@ [Z_j @
19 20 8 9 la if 12 7
OCCUR R E r.CE REPORT HEVISION SEQU E N T I AL.
REPORT NO, CODE TYPE NO.
@ gEP, L EP RO EVENT YE AR l 7l 9) [__j l1 24 2 8j
/6 y
27 l0l3l 28 2')
lL l 30 l-l 31 W32
_ 21 21 23 ATT ACHY ENT NPRD-4 PRIVE COMP. COVPCNfvT ACTI% FUTUcE [FFECT S H U T Dr : .' ."J SU FPLI E R MANUFACTUNEH TAKE'. A C i t rA ONPLANT YETHUD HOURS SUBUITTED F OH M :,Utt Zlg [ 0l 0l 0 j@ lA j@ lB 0 l 7 l 5 lg
[B jg]4g JJ J h Jo Zl@ 31 40 l l Yl@
41 42 43 44 4/
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o [The cause of the low filter efficiency was leakage between the filter plate and the I
!ilij jassembly. This leakage was due to insuf ficient pressure applied to the gasket.
g,17llUnder Maintenance Work Order 79-3756, the nuts holding the plate were torqued to i 3 75 in-lbs. The unit then successfully met the requirements of ST 5067.02 on l I
liI41 l December 17, 1979. 80 7 8 9 DISCOV H DISCOVETlY OECCRIPTIqN ST A S %POV.En OTHER STATUS test limit l liIsl W @ l0l_0 0
@l NA l
Bl@lUnabletomeet AC TiviTY COYTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE RELE ASTD OF PELE ASE
_ Q lZ @ y@l NA l l NA 80 l
8 9 10 11 44 45 7
PERSONNEL FRPOSURES NUYBER TYPE DESCRIPTION ~
N^ l lu d' I010l01@lZl@l unSONNEl'ImuL S Nuv.ER DoSCR,PTiON@
l li la l8 1010 l '01@l NA q qc B0 1l/j pl J 9 it i2 7
j{J LOSS OF OR OAVAGE TO FACILITY h TYPE DE SCHIP TION %./
l i 9 tl 9 W@l 10 NA go 7
2 n istuEl @oYs'CnipIioN NA @ l 68 69 lllll l ll l lj 80 g 7 8 9 10 O 08 419-259-5000, Ext. 235 DVR 79-195' NAME OF PREPARER.
Y
- PHONE:
e-h001140 % { g
. s TOLEDO EDISON COMPANY DAVIS-BESSE UUCLEAR POWER STATION UNIT ONE SUPPLE'4 ENTAL INFORMATION FOR LER MP-33-79-149 DATE OF EVENT: December 10, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Emergency Ventilation System (EVS) 1-1 Charcoal Bank
- 2 F19-1 C-2 leakage 4
Conditions Prior to Occurrence: The unit was in Mode 5, with Power (MWT) = 0, and Load (Gross MWE) = 0.
Description of Occurrence: While performing ST 5067.02, EVS 18 Month or Special Test, the charcoal filter bank in the EVS Unit 1-1 (F19-1, C2) failed to meet ST 5067.02 Acceptance Criteria 7.1 (i.e., the charcoal bank capable of removing 2L 99% of the halogenated hydrocarbon refrigerant test gas with 8000 cfm + 10% of air flow). Since the station was in Mode 5 at the time of the event, the unit did not enter an action statement. This is being reported as documentation of a component failure.
Designation of Apparent Cause of Occurrence: The cause of the low filter efficiency was leakage located between the filter plate and assembly. Leakage was due to in-sufficient plate / assembly pressure applied to the gaskets which may have been induced by normal vibration.
Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The unit was in Mode 5, the redundant EVS Train 1-2 was operable, and there was no fuel in the spent fuel pool.
Corrective Action: The nuts of the filter cells were torqued under Maintenance Work Order 79-3756 on December 17, 1979. This provided the necessary seal. On December 17, 1979, ST 5067.02 was performed successfully. A procedure change will be made to prevent similar occurrences by requiring that the nuts to the filter cells be torqued to 75 in-lbs and a light source leak test be performed following the removal and re-assembly of the filter. This ST 5067.02, EVS 18 Month or Special Test, is always used following any EVS work to ensure operability af ter maintenance.
Failure Data: There have been no previous similar reportable occurrences.
LER #79-128 '. ,2 6 1740
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