ML19242A846: Difference between revisions
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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 | ||
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L l e t *. N L 1 't P E .i d S/ LAI '> *i | 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}@ | ||
i1 15 L I L L N ;.t. N' LH | |||
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7 b tJ e.: | 7 b tJ e.: | ||
L VENT DESCRIP'lO') nND PHOB ABLE CONSLGUENCE S h n > | L VENT DESCRIP'lO') nND PHOB ABLE CONSLGUENCE S h n > | ||
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@ ., | ||
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HEPoHlND. (COL TYFt ND | |||
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A ATT ACH'' T - | |||
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Line 76: | Line 63: | ||
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Line 85: | Line 71: | ||
'" 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 01:49, 2 February 2020
ML19242A846 | |
Person / Time | |
---|---|
Site: | Davis Besse |
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
? 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 HEPoHlND. (COL TYFt ND
! 'iE N T Y L A H l-1
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LDJ n
. ~ -
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40 l
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l po l The ap;m rent cause is believed to be norr:a1 wear of t he valve int ernal parts which 3 1 l necessitated slir,ht adjustacnt of the torque switch settinn. The torene switch !
valve successfully j, ,
gettinr, nd the open linit switch setting,s were ad j u st.ed , and t !
, j stroked twice ar.ainst full differential pressure MS-106 was tested per the AFW Sys-_j
,3 l
g g , ] [ t en Mon t hl y 'I e s t and was declared operable on July 10, 1979. b) 7 H 3
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F Attt IT Y DISCOV[ HY DEED: J TION o.
5 T A T i '. . I' O A t' H OT HE R 'iT A T US DLV Q\EHY 0 0 0 checFout t 6 C NA 44 4L Al h Observed 4o durinn naintenance EJ 7 8 11 1J 13
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p i N ia sa i s 3 iu 79080609ss -
i liiiiiiiii m ;
o ea -i ;
'" 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 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
[i l C U lJ