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               .Hr.1 y>G LICENSEE EVENT REPORT CONT F 'it ULOCK'l                                    l      l        l      l              l                                      (PLEASE PRINT OR TYPE ALL REQUIRED INFORriATION) i
               .Hr.1 y>G LICENSEE EVENT REPORT CONT F 'it ULOCK'l                                    l      l        l      l              l                                      (PLEASE PRINT OR TYPE ALL REQUIRED INFORriATION) i
,II T) W g DlB                                                    S 1 QO                    O            - l0              0      N        P        F    - 0[3j@ dl1l1 ia    its 1l1 @[
,II T) W g DlB                                                    S 1 QO                    O            - l0              0      N        P        F    - 0[3j@ dl1l1 ia    its 1l1 @[
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                                                                                                                                                                                                                                                            @
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d 9                    LILi L t E t L.; .t (ON' T U lj                            "] [ Lj@[ 0 ] 5 l 0 l - j 0 3l4l6lQ Ol7l0l8l7l9]@l0l8        DO;str-                    cEH                  re        L. .#      EtLNTDAlt                14        a        l0hi FOd1  l2 Dl7Alf 19 W}@
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Line 35: Line 31:
out this occurrence                                                  (NP-33-79-85)                                                                                                                                                        'T,jo
out this occurrence                                                  (NP-33-79-85)                                                                                                                                                        'T,jo
   ?            ts 9 si s tr u                    cut                          cat r                                                                        Cow                      vwe r CLDE                    Su .U...                            L O'.'f 0N L N T COD L                  SU6 COOL                SUcCCDE CODE o    o                                          L c I n l@ ol F. l@ i l a l@ lovI A LI vI ol Pl@                                                                              m ln A l@ l Z l@            .,
   ?            ts 9 si s tr u                    cut                          cat r                                                                        Cow                      vwe r CLDE                    Su .U...                            L O'.'f 0N L N T COD L                  SU6 COOL                SUcCCDE CODE o    o                                          L c I n l@ ol F. l@ i l a l@ lovI A LI vI ol Pl@                                                                              m ln A l@ l Z l@            .,
   ,              c                                    ..                lo OCCle hi NCl            HEPO41                                    NEWlON SE O'.) L N 11 A L
   ,              c                                    ..                lo OCCle hi NCl            HEPO41                                    NEWlON SE O'.) L N 11 A L HEPoHlND.                                            (COL                    TYFt                                        ND
                                                      ,
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                                                         ! 'iE N T Y L A H l-1
                                                         ! 'iE N T Y L A H l-1
                                              -
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A      ATT ACH''    T                                -
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                       }[bb                                            h4 IL          1            m        . , , _
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* I                    O                                          Nb                                                                                                                                                                                            -
     /            b    '6                        1I              12 i O'. i of (    t'  r>              ', [ TOFA,I1lTY IvP[            .
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                       ,a"ru @                                                                                                                                                                  M ^'                      "          '""""""""
                       ,a"ru @                                                                                                                                                                  M ^'                      "          '""""""""
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p i N ia sa i            s 3                  iu 79080609ss                                                                -
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       '"              0 10'                                                                      inin                .1 . O'Neill                                                              o m, ,        419-259-5000, F:: t . 293_ 2
       '"              0 10'                                                                      inin                .1 . O'Neill                                                              o m, ,        419-259-5000, F:: t . 293_ 2


    .
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION l'';IT ONE SUPPLEMENTAL INFOP3t\T10N FOR LE'1 SP-33-7 9-83 DATE OF EVENT: July 8, 1979 JACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRE''rE - Main Steam line to Auxiliary Feed Pump Turbine 1-1 steam inlet isolation val    MS-106 failed to operate properly.
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION l'';IT ONE SUPPLEMENTAL INFOP3t\T10N FOR LE'1 SP-33-7 9-83 DATE OF EVENT: July 8, 1979 JACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRE''rE - Main Steam line to Auxiliary Feed Pump Turbine 1-1 steam inlet isolation val    MS-106 failed to operate properly.
Conditions Prior to Occurrer.ce:    The unit was in Mode 3, with Power (3P..T) = 0, and Load (Gross MUE) = 0.
Conditions Prior to Occurrer.ce:    The unit was in Mode 3, with Power (3P..T) = 0, and Load (Gross MUE) = 0.
Description of Occurrence: On July 8, 1979, during checkout of the relay in the notor operator control circuit of valve MS-106, " Main Stean Inlet to 'uxiliary Feed Punn
Description of Occurrence: On July 8, 1979, during checkout of the relay in the notor operator control circuit of valve MS-106, " Main Stean Inlet to 'uxiliary Feed Punn Turbine (A FPT) 1-1 Isola t ion Valve", MS-106 torqued cut while openin;; c.nd was d.:clared inoperable at 1530 hours. This placed the unit in the Action Statercat of Technical t>
                                                                        .
Turbine (A FPT) 1-1 Isola t ion Valve", MS-106 torqued cut while openin;; c.nd was d.:clared inoperable at 1530 hours. This placed the unit in the Action Statercat of Technical t>
Specif ir.ation 3.7.1.2 which requires two independent Auxiliary Feedwater Trains be operable in Modes 1, 2, and 3.
Specif ir.ation 3.7.1.2 which requires two independent Auxiliary Feedwater Trains be operable in Modes 1, 2, and 3.
Designation of Appgirent Cause of Occurrence r The apparent cause of this problea is beli."'ad en h" d"o en normal we:1r of the valve in t e r na l parts wnich nade it acce s.>a t s to increase the torque switch setting slightly.
Designation of Appgirent Cause of Occurrence r The apparent cause of this problea is beli."'ad en h" d"o en normal we:1r of the valve in t e r na l parts wnich nade it acce s.>a t s to increase the torque switch setting slightly.
Line 96: Line 79:
Corrective Ac tion:  Under Maintenance Work Order (3F.?O) 79-2461, the notor operator was removed, inspected and reinstalled. The open torque switch settira was increased from 1.9 to 2.5. The valve was stroked twice and opera ted properly        However , when opera-
Corrective Ac tion:  Under Maintenance Work Order (3F.?O) 79-2461, the notor operator was removed, inspected and reinstalled. The open torque switch settira was increased from 1.9 to 2.5. The valve was stroked twice and opera ted properly        However , when opera-
                                                                                                   'dainten-tions personnel attempted to stroke the valve, it torqued eut while going closed.
                                                                                                   'dainten-tions personnel attempted to stroke the valve, it torqued eut while going closed.
ance personnel then decreased the open torque switc        settin" of the valve to 2.4 and made a slight adj ustm ent to the open limit switch in order to keep it closed longer when the valve is moving of f its back seat. The valve was stroked twice against fell differential pressure and operated properly. ':5-lC'6 wa s t hen testcd
ance personnel then decreased the open torque switc        settin" of the valve to 2.4 and made a slight adj ustm ent to the open limit switch in order to keep it closed longer when the valve is moving of f its back seat. The valve was stroked twice against fell differential pressure and operated properly. ':5-lC'6 wa s t hen testcd per ST 5071.01, " Auxiliary Feedwater System Monthly Test", and was declared ope ra-ble on July 10, 1979. A Maintenance Work Order has been written to inspect MS-106 internally at the refueling outage.
                                                                    -
per ST 5071.01, " Auxiliary Feedwater System Monthly Test", and was declared ope ra-ble on July 10, 1979. A Maintenance Work Order has been written to inspect MS-106 internally at the refueling outage.
Failure Data: A previous inoperability of valve MS-106 was reported in Licensee Event Report NP-33-79-03. This previous incident was caused by a dirt buildup on the valve stem.
Failure Data: A previous inoperability of valve MS-106 was reported in Licensee Event Report NP-33-79-03. This previous incident was caused by a dirt buildup on the valve stem.
LER #79-073 i :      r, , n
LER #79-073 i :      r, , n
[i l C    U    lJ}}
[i l C    U    lJ}}

Latest revision as of 02:49, 2 February 2020

LER 79-073/03L-0 on 790708:during Checkout of Valve Relay, Main Steam Inlet to Auxiliary Feed Pipe Turbine 1-1 Isolation Valve Torqued While Opening.Caused by Normal Valve Wear.Valve Was Readjusted & Returned to Svc
ML19242A846
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 08/02/1979
From: Oneill J
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19242A845 List:
References
LER-79-073-03L, LER-79-73-3L, NUDOCS 7908060455
Download: ML19242A846 (2)


Text

J U. S. NUCLE AG T'EGUL ATORY COMMISSION

.Hr.1 y>G LICENSEE EVENT REPORT CONT F 'it ULOCK'l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORriATION) i

,II T) W g DlB S 1 QO O - l0 0 N P F - 0[3j@ dl1l1 ia its 1l1 @[

L l e t *. N L 1 't P E .i d S/ LAI '> *i i1 15 L I L L N ;.t. N' LH d 9 LILi L t E t L.; .t (ON' T U lj "] [ Lj@[ 0 ] 5 l 0 l - j 0 3l4l6lQ Ol7l0l8l7l9]@l0l8 DO;str- cEH re L. .# EtLNTDAlt 14 a l0hi FOd1 l2 Dl7Alf 19 W}@

7 b tJ e.:

L VENT DESCRIP'lO') nND PHOB ABLE CONSLGUENCE S h n >

lOn July 8, 1979, during a checkout of a relay in the motor operator control circuit of to Auxiliary Feed Pump Turbine 1-1 Isolation Valve",

gg l valve MS-106, "Ma in Steam Inlet valve was declared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> , placing g j jtorqued out while opening.

There was no g n .,) lthe ut.it in the action sta tement of Technical Specification 3.7.1.2.

The unit had been o r, l danger to the health and safety of the public or station personnel.

Auxiliary Feedwater (AFW) Train 1-2 was operable th ro u r,h-g]T) ghutdoun since March 31, 1979. _

g,,

out this occurrence (NP-33-79-85) 'T,jo

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION l;IT ONE SUPPLEMENTAL INFOP3t\T10N FOR LE'1 SP-33-7 9-83 DATE OF EVENT: July 8, 1979 JACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRErE - Main Steam line to Auxiliary Feed Pump Turbine 1-1 steam inlet isolation val MS-106 failed to operate properly.

Conditions Prior to Occurrer.ce: The unit was in Mode 3, with Power (3P..T) = 0, and Load (Gross MUE) = 0.

Description of Occurrence: On July 8, 1979, during checkout of the relay in the notor operator control circuit of valve MS-106, " Main Stean Inlet to 'uxiliary Feed Punn Turbine (A FPT) 1-1 Isola t ion Valve", MS-106 torqued cut while openin;; c.nd was d.:clared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />. This placed the unit in the Action Statercat of Technical t>

Specif ir.ation 3.7.1.2 which requires two independent Auxiliary Feedwater Trains be operable in Modes 1, 2, and 3.

Designation of Appgirent Cause of Occurrence r The apparent cause of this problea is beli."'ad en h" d"o en normal we:1r of the valve in t e r na l parts wnich nade it acce s.>a t s to increase the torque switch setting slightly.

Analysis of Occurrence: There was no danger to the health and saf ety of the public or to station personnel. The unit had been shutdown since ': arch 31, 1979, and throughout this occurrence. Auxiliary Feedwater Train 2 was operable at the time of this occurroace.

Corrective Ac tion: Under Maintenance Work Order (3F.?O) 79-2461, the notor operator was removed, inspected and reinstalled. The open torque switch settira was increased from 1.9 to 2.5. The valve was stroked twice and opera ted properly However , when opera-

'dainten-tions personnel attempted to stroke the valve, it torqued eut while going closed.

ance personnel then decreased the open torque switc settin" of the valve to 2.4 and made a slight adj ustm ent to the open limit switch in order to keep it closed longer when the valve is moving of f its back seat. The valve was stroked twice against fell differential pressure and operated properly. ':5-lC'6 wa s t hen testcd per ST 5071.01, " Auxiliary Feedwater System Monthly Test", and was declared ope ra-ble on July 10, 1979. A Maintenance Work Order has been written to inspect MS-106 internally at the refueling outage.

Failure Data: A previous inoperability of valve MS-106 was reported in Licensee Event Report NP-33-79-03. This previous incident was caused by a dirt buildup on the valve stem.

LER #79-073 i : r, , n

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