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{{#Wiki_filter:,,o (1 71)LICENSEE EVENT REPORT CONTnot BLOCx: l lll _ ll(PLEASE PRINT OR TYPE ALL REQUIRED INFOHMATION) lo lil lO ] H j D l B l S l 1 l@l 0l 0l -l 0l 0 Nl Pl Fl -l 0] 31GL4l 1l 1l 1l 1 @l ll@7 8 9 LLCCP.SE E CODE I4 M LICENSE NVYdLH h 2ti UCt.NSE T v FE JG 57 L A T bd yn] l Lj@l 0 l 5 l 0 l- l 0 l 3 l 4 l 6 j@!1 l 2 ]1 l0 l 7 l 9 !@l 0 l 1 l 0 l 8 l 8 l 0 l@
{{#Wiki_filter:,,o (1 71)
CON'T o i M b3 EVENT OATE 14 h REPORT D ATE tiJ s i 8 L0 t> 1 DOCK E T ?.UMB EM EVENT DESCRIPTION AND FROBABLE CONSEQUENCES h l During the performance of ST 5067.02, Emergency Ventilation System (EVS) 18 Month or lO 2l Special Test, the charcoal filter bank in EVS Unit 1-1 failed to meet the efficiency lo 3l11mit as required by T.S. 3/4.6.5.1 while in Modes 1 thru 4.
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@
Being in Mode 5 at the J o 4 time of the finding, the station did not enter an action statement. This is being lo 5 j o 6l reported to document a ec- ponent failure. There was no danger to the health and _
UCt.NSE T v FE JG 7         8 9           LLCCP.SE E CODE                 I4   M CON'T o    i              yn]
l safety of the public or station personnel. The redundant EVS Train 1-2 was operable lo 7!had it been required.(NP-33-7 9-149) 0 a 7 8 9 COVP.VALVE S Y S TE *.f CAUSE CAUSE CODE COOE SUBCODE COYPONENT CODE SUBCODE SUBCODElSlHl@ lE @ l Bl@ l Bl Ll 0] Wl El R]h W@ [Z_j @
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@
O 9 7 8 9 la if 12 f3 Id 19 20 SEQU E N T I AL.
i           8                       L0             t> 1             DOCK E T ?.UMB EM EVENT DESCRIPTION AND FROBABLE CONSEQUENCES h l
OCCUR R E r.CE REPORT HEVISION L EP RO EVENT YE AR REPORT NO, CODE TYPE NO.@ gEP,l 7l 9)[__jl1 2 8j yl0l3llL ll-lW_ 21 21 23 24/6 27 28 2')30 31 32 ACTI% FUTUcE
O    2      l During the performance of ST 5067.02, Emergency Ventilation System (EVS) 18 Month or l
[FFECT S H U T Dr : .' ."J ATT ACHY ENT NPRD-4 PRIVE COMP.
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
COVPCNfvT TAKE'.A C i t rA ONPLANT YETHUD HOURS SUBUITTED F OH M :,Utt SU FPLI E R MANUFACTUNEH
o 6          l reported to document a ec- ponent failure. There was no danger to the health and _
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o    7      l safety of the public or station personnel. The redundant EVS Train 1-2 was operable                                                                                                 l
, h Jo 31 40 41 42 43 44 4/JJ J CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h
                                                                                                                                                                                                          !
[The cause of the low filter efficiency was leakage between the filter plate and the i o!ilij jassembly. This leakage was due to insuf ficient pressure applied to the gasket.
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 @
I g,17llUnder Maintenance Work Order 79-3756, the nuts holding the plate were torqued to 75 in-lbs.
19              20 8                         9           la           if                     12 7
The unit then successfully met the requirements of ST 5067.02 on li 3 IliI41 l December 17, 1979.
OCCUR R E r.CE         REPORT                     HEVISION SEQU E N T I AL.
80 7 8 9 ST A S%POV.En OTHER STATUS DISCOV H DISCOVETlY OECCRIPTIqN test limit lNAlBl@lUnabletomeet liIsl W @ l0l_0 0 @l""""**COYTENT'' *AC TiviTY LOCATION OF RELEASE RELE ASTD OF PELE ASE AMOUNT OF ACTIVITY
REPORT NO,                                 CODE                 TYPE                         NO.
_ Q lZ @ y@l NA ll NAl7 8 9 10 11 44 45 80 PERSONNEL FRPOSURES NUYBER TYPE DESCRIPTION ~
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_ 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
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e-- '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
J                      h                   Jo Zl@                31                     40 l    l Yl@
.FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:
41               42               43             44             4/
Emergency Ventilation System (EVS) 1-1 Charcoal Bank
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i  o      [The cause of the low filter efficiency was leakage between the filter plate and the I
#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.
    !ilij jassembly. This leakage was due to insuf ficient pressure applied to the gasket.
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).
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
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.
liI41 l December 17, 1979.                                                                                                                                                                         80 7         8 9 DISCOV H                                DISCOVETlY OECCRIPTIqN ST A S               %POV.En                             OTHER STATUS test limit                                 l liIsl
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.
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AC TiviTY     COYTENT AMOUNT OF ACTIVITY                                                                      LOCATION OF RELEASE RELE ASTD OF PELE ASE
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8 9                 10             11                                                       44           45 7
PERSONNEL FRPOSURES NUYBER                 TYPE           DESCRIPTION ~
N^                                                                                                                                      l lu
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  . 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.
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 1 7 4 0'. ,2 6.%}}
LER #79-128                                                               '. ,2 6 1740
                                                                                    .
                                              %}}

Revision as of 12:02, 19 October 2019

LER 79-128/03L-0:on 791210,during Emergency Ventilation Sys Test,Charcoal Filter Bank in Unit 1-1 Failed to Meet Efficiency Limit in Modes 1-4.Caused by Leakage Between Filter Plate & Assembly Due to Insufficient Gasket Pressure
ML19211C766
Person / Time
Site: Davis Besse Cleveland Electric icon.png
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)
v • d • e


Text

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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

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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

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AC TiviTY COYTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE RELE ASTD OF PELE ASE

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PERSONNEL FRPOSURES NUYBER TYPE DESCRIPTION ~

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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.

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. 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

  1. 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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