ML20062D453: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot change)
(StriderTol Bot change)
 
Line 1: Line 1:
{{Adams
#REDIRECT [[05000301/LER-1978-009-03, /03L-0 on 780913:on 2 occasions,2 of 3 Charging Pumps Were isolated.2 3/4 Crosby Relief Valves Leaked Through Causing Temporary Loss of Charging Flow.Charging Pump Relief Valve Replaced & a Pump Returned to Svc]]
| number = ML20062D453
| issue date = 10/13/1978
| title = /03L-0 on 780913:on 2 occasions,2 of 3 Charging Pumps Were isolated.2 3/4 Crosby Relief Valves Leaked Through Causing Temporary Loss of Charging Flow.Charging Pump Relief Valve Replaced & a Pump Returned to Svc
| author name = Burstein S
| author affiliation = WISCONSIN ELECTRIC POWER CO.
| addressee name =
| addressee affiliation =
| docket = 05000301
| license number =
| contact person =
| document report number = LER-78-009-03L, LER-78-9-3L, NUDOCS 7811240134
| package number = ML20062D450
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
 
=Text=
{{#Wiki_filter:-
        .~            .
' NRC FO7.M Sh6                                                                                                                U. S. NUCLEA2 REGULATC7.Y COMMISSION 87 771 LICENSEE EVENT REPORT CONTROL BLOCK: l 1
l    l    l    l  l      lh 6
(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo lil8 3I wiIl plB lul 2 l@l o I ol -l olo lo lo I ol l ol 01@4l111 I lil l@l I l@
84                          LICENSE NUMSER                  26 7                      LICEMEE CODE                    15                                                              26      UCENsE TYPE JO      67 CAT 68 CON'T lolil i        8 ST "c!60l L l@l            61 0 l 5looCK 0 ETl NUMBER 0l 0 l 310 68l1 @l        69 0l EVENT 9 l 113 oATE l 7188's7$ i l al
                                                                                                                                "                l 11 l 7 l n80I@
REPORT oATE          ,
EVENT DESCRIPTION A_ND PROBABLE CONSEQUENCES h to121l On 2 occasions 2 of 3 charging pumps were isolated on 09-13-78. TS
* I l o 131 I normally require 2 operable pumps, but TS 15.3.2.D.1 permits operatica l lol4]l with 1 for up to 24 hours.                                                  The A and B pumps were isolated from 0050                                              I l o l 31 l to 0115 hours when relief valve leakage occurred on both pumps and                                                                                              I 1
lo le i I charging line flow indication was lost. Chargina line flow returned to I i l normal after the pumps were isolated. Relief valve exchange necessitated l o is 1 I simultaneous removal of 2 pumps from service from 0858 to 0945, 9-13-76 J 7        8 9                                                                                                                                                          "
                                          "SI'E            "^iECo '      **ioE st C                    CoMeoNENT CooE                  su8S*oSE suNo'o 7
o 9 8
l Pl Cl@ y@ W@ lV lA I L lV l E l X l@ W@ W @
9        to        11            12              13                          18        19            20
                                      .                                        sEoVENTIAL                      OCCURRENCE          REPORT                  Revision LE            EVENT YE AR                            R EPoRT No.                          CooE              TvPE                    No.
                  @ yq;R;ga0 17 l81                          l---J          1010191                M            10131              W            l- -J      W
                                      ,,. 21      22        23            24            26      27          28      29          30          31        32 T K N A          O          ON PL NT          M                        MoVAs 22        s8 i            FoR      8. su LE            MANUF CTURER
[_B 33 jgl34Z l g              g g 3h              3l6Zl@
l0l0l0l 37                  40 l  gg 41 l Ylg lN l@ l Cl7 l 1l0 l@
42              43          44            47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g lTwo 3/4" Crosby relief valves (Dr. No. H-50913-1) leaked through caus- I
[T,g l ing temporary loss of charging flow. The A charging pump relief valve                                                                                          l lwas replaced with a spare by 0315 hours, 9-13-78, and the A pump was                                                                                      I g [ returned to service.                                              The C pump relief valve was removed and placed onI g lthe B pump, enabling the B pump to be returned to service with full                                                                                                    I r        8 9                                                                                                                                      capacit y.        m
              's*T A'EY              snowER                      oTwER status @ 5'sCoSS8v'                                      oiscovERv oEsCRinTioN @
NA                                        Operator observation Lu_5J O@ l 11010l@l"                                                                  "
l    [A    l@l''                                                                  l
          'JTiviTv CRTENT aELE AsEo OF RELEASE                        AMOUNT oF ACTIVITv                                                    LoCATeoN oF RELEASE 1 6
[1.,,,l h ERsoN~EL E ,oseEs hl                      NA I        l NA l
                    ~uM8ER                  T ,E      oEsCRi.1,o~ @
lil7l *l 0l
* 0 10 l@l Zl@l"                              NA                                                                                                      l
                    ,ERsoN~El'muns
* W l 801
                    ~u, 8E R 0 10 l@l oEsCRi,Tio~@
NA 7811240 M                                                                    l 7            9                  11        12                                                                                                                        80
                                      ^ '
                'SS T E ' Me"R ?T c'N '''' " " @
      ' 9        (_Z.,jhl                                          NA                                                                                                    I 7        8 9                10                                                                                                                                        80        j i$$vE
* LL.L.J L Njh]oESCRIPTtoN                                        NA                                                                      i    lllllllllll!lI                      '
  ?        s 9              10                                                                                                          68 69                        80 3      1 yn., nc RacR Anca                21MMMU                                                      NE
 
i ATTACHMENT TO LICENSEE EVENT REPORT NO. 78-009/03L-0 Wisconsin Electric Power Company Point Beach Nuclear plant,        Unit 2 Docket No. 50-301 On two occasions on 09-13-78 two of the three charging pumps were isolated for short periods.          Limiting conditions for operation in the Technical Specifications require that two charging pumps be operable under normal conditions, but Technical Specification 15.3.2.D.1 permits plant operation with only one charging pump in service for up to 24 hours.
Charging pump problems began at 0042 hours when charging line
(~ ,
flow indication was lost while initiating a capacity test of the "A" charging pump with the "B" charging pump running.              The "C" charging pump was immediately started.            At 0045 hours the "B" pump relief valve was found to be leaking through; the "B"                  pump was isolated at 0050 hours. Charging line flow indication                    in-creased momentarily. At 0054 hours it was found that the "A" pump relief valve was leaking through, at which time the "A" pump was isolated. At 0102 hours charging line flow indication returned to normal and the "B" pump was returned to service at 0115 hours.
Although the relief valve continued to leak through at this time it was possible to maintain normal charging flow.
Maintenance was called in to replace the "A" pump relief valve with a spare. At 0315 hours the "A" pump was returned to service. The "B" pump was then taken out-of-service to remove its relief valve. At 0858 hours the "C" pump was taken out-of-service 73        to remove its relief valve so that valve could be placed on the
(_        "B" pump. At 0945 hours the relief valve exchange was completed and the "B" pump was returned to service. The "C" charging pump was restored to service at 0956 hours on 09-15-78 following over-haul of one of the two defective relief valves.
The two leaking relief valves were disassembled, inspected and refurbished. One of the valves had a significant cut in its seat, while the other had no obvious defects.
While there is no history of pressure spiking during starting or transferring of charging pumps, it appears possible that a brief pressure spike caused these relief valves to lift and small deposits in the fluid prevented their full reseating to precipitate this series of events.
                                                                .%-                        --}}

Latest revision as of 23:54, 16 December 2024

Redirect to:

Retrieved from "https://kanterella.com/w/index.php?title=ML20062D453&oldid=4456689"