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#REDIRECT [[05000346/LER-1979-030-03, /03L-0 on 790220:auxiliary Feedwater Valve Could Not Be Closed,Rendering Auxiliary Feedwater Sys 1-1 Inoperable.Caused by Faulty Torque Switch.Heavier Duty Unit Installed & Sys Declared Operable]]
| number = ML19274E472
| issue date = 03/19/1979
| title = LER 79-030/03L-0 on 790220:auxiliary Feedwater Valve Could Not Be Closed,Rendering Auxiliary Feedwater Sys 1-1 Inoperable.Caused by Faulty Torque Switch.Heavier Duty Unit Installed & Sys Declared Operable
| author name = Naylor R
| author affiliation = TOLEDO EDISON CO.
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
| docket = 05000346
| license number =
| contact person =
| document report number = LER-79-030-03L, LER-79-30-3L, NP-33-79-33, NUDOCS 7903260227
| package number = ML19274E468
| document type = LICENSEE EVENT REPORT (SEE ALSO AO,RO), TEXT-SAFETY REPORT
| page count = 2
}}
 
=Text=
{{#Wiki_filter:U.S. NUCLE AR REGULATORY COMMISSION NRC FORM 366 (7 77)                '
LICENSEE EVENT REPORT CONTROL BLOCK:
1 l  l      l    l  l 6
lh                  (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) 0    1      l0lH          D l B l S l 114l@l150 l 0              - l 0 lLICENSE 0 lNNvYSER  l P I F l- l01325 l@l4        _
26 l1LICENSE l1 l1TYPE              l l1 JJl@l51 CATSd    l@
7          8 9          LICENSEE CODE CON'T                                                                                                          ~
3g[gC          l L @] 0 l 5 l 0 l - [ 0 l 3 l 4 l 6 @l                          0 lEVENT 2 l DATE 2 l 0 l 7 14l 9 l@l          0REPORT l 3 lDATE 1l9l7 o    i                                                                                                                              75                        80 l 9 @
61            COCKET NL*.'5 ER              Ed    63 7          8                      00 EVENT DESCRIPTION AND PROB ABLE CONSECUENCES h i
l o l 2 l l On 2/20/79 at 1300 hours while perf orming surveillance testing, Auxiliary Feedwater This rendered AFW Sys- l o    a      I (AFW) Valve AF3869 could not be closed by the notor operator.
The  l o    4      l ten 1-1 inoperable and placed the unit in the Action Statement of T.S. 3.7.1.2.
lolsl l Action Statement requires the inoperable systen be returned to operable status within l 0    6      ]72 hours or be in Hot Shutdown within the next 12 hours. There was no danger to the                                                                          I I
l o l 7 l l health and saf ety of the oublic or unit personnel. AFW Systen 1-2 was available to I
o    a l feed the affected steam generator.                                        (NP-33-79-33)
CAUSE                                                    COYP.          VALVE SYSTEN1          CAUSE                                                                                  SUSCODE CODE              CODE        SUSCODE                  COhiPONENT CODE                SUBCODE 7
o 9 8
lC l Hl@ l El@ l Al@ l V] Al Ll Vl 0l P h W@ lD l@
9        10        11            12              13                          18          19            20 REVISION SE QUE NTI AL                      OCCURRENCE          REPORT CODE              TYPE                      N o.
EVENT YE AR                            REPORT NO.
LER RO h REPOhT l7l9                            l-l            l 01 3l 0l              l/l          l0l3l                  Ll          l-l        10l 21          28      29          30            31          32
_ 21        22        23            24              26 HOURS            S BN IT D      FO 15    8. SL PLIE          MA    F TUPER T KE      A    O          C PL      T          E l33A lgl34Xlg                    Z lg        l36Z l@          l 0l 0l 0l 0l40 31 lYg 41 lY [g W@
42              43          44 L l 2 ] 0 l 047l@
35 CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h i    o      IThe cause of the occurrence was due to a f aulty torque switch in the notor operator fori g , ; , ; ) AFW Valve AF3869. A replacement torque switch, of heavier duty design supplied on
      ,    .,      lthe vendor's sa=c part number, was installed. At 1915 hours on 2/20/79, ST 5071.01                                                                          l from the              ,
l , l 3 g l was perforned and AFW Systen 1-1 was declared operable, removing the unit
                                                                                                                                                                                ;
      ,    4      l Action Statement of Technical Specification 3.7.1.2. _                                                                                                  80 7          8 9
                                    % POV.ER                    OTHER STATUS                DISCOV RY                          DISCOVERY DESCRIPTION ST    S l
li j s j y@ l 0l 8 l 7 l@l                                NA                          l    l B l@l Surveillance Test ST 5071.01 ACTIVITY      CONTENT AYOUNT CF ACTIVITY                                                      LOCATION OF RELEASE RELEASED OF RELE ASE (TI6] y @ l Z l@l NA                                                                    l          l NA                                                                  80 10                                                      44          45 7        8 9                            11 PERSGNNEL EXPOSURES NUYBER              TYPE      CESCRIPTION NA                                                                                                                    l i    7 l 0 l 0 l 0 lhl Z hl PERSONN E L IN )b RIES
* NUY9ER              DESCRIPTION l
7 1 R 8 9 l0l0l0l@l      11    12 NA 80 LOSS OF OR D AY AGE TO F ACILITY TYPE      DESCRIPTION "A                                                                                                                                          I L'hJ8 Lz 7            9 J@l    to 80 PUBLICITY                                                                                                                          NRC USE ONLY              ~
                                              @                  7 9 0 3 2 6 0 2a7                                                                llllllll            l lll7 2 o        ISSUED lN l          @lDESCn>
NA              prion                                                                                                                  bJ .;;
68 69 8 9            la 7
mhad Nayh                                                                    umb%M, M.                      2M DVR 79-039                  NAME OF PREPAREn pggyg;
 
      ~
^
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-33 DATE OF EVENT: February 20, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feedwater (AFW) Systen valve torque switch failed Conditions Prior to Occurrence: The unit was in Mode 1, with Power (!C(I) = 2422, and Load (Gross MWE) = 818.
Description of Occurrence: On February 20, 1979 at 1300 hours while performing Surveillance rest ST 5071.01, " Auxiliary Feedwater System Monthly Test", AFW System Valve AF3869 could not be closed by the motor operator, but could be opened by the    ..
motor operator. This rendered AFW System 1-1 inoperable and placed the unit in the Action Statement of Technical Specification 3.7.1.2, which requires two independent steam generator auxiliary feedwater pumps and flowpaths be operable. The Action Statement requires the inoperable system be returned to operable status within 72 hours or be in Hot Shutdown within the next 12 hours.
Designation of Apparent Cause of Occurrence: The apparent cause of the occurrence was due to a f aulty torque switch in the mocar operator for AFW Valve AF3869. The closing torque switch would actuate and prevent the valve from closing with the motor operator. The valve could be operated manually.
Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. In the event of an occurrence which required the AFW System, AFW System 1-2 would have fed the af fected steam generator.
Corrective Action: A new torque switch was installed under Maintenance Work Order 79-1558. This torque switch supplied on the vendor's same part number, is of a heavier duty design. At 1915 hours on February 20, 1979, Surveillance Test ST 5071.01 was performed and AFW System 1-1 was declared operable, removing the unit from the Action Statement of Technical Specification 3.7.1.2.
Failure Data: One previously reported failure of AFW System motor operator torque switches had been reported under Licensee Event Report NP-33-77-83.
LER #79-030}}

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