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                                                      .          Lt V L.l V U L L L V Ll'd I a i s .1      se n a (O
(
U                CONTPOL DLOCKa                l    l    l    I  l    l                                (PLEAGC PntNT ALL RtQUtRtO INFCnt.1 AT:                                4
-l                                                  1                          6 N      E                                    LICENSE NUMCtn                              .        YE                I ST i  l Fl L l Cl R l P l 3 l                  l0 l0 l-l0 l 0 l 0 l 0 l 0 l-l 0 l 0 l                      l4l1 l] l1 l 1l            l 0l 3l 32 7 UD                                      14    15                                                  25      26                    30    31 U
CATEcony              tvp[  e$o'v7"g                ocCxET NUMOEn
* EVENT oA[E                            REPcAT oAft E CONT I              l -j        Lt_J        lt i    lo is lo I-10.12 In 12 I                      I 01610 I 71717 i                I0161218l7I 7 0          57          60          59        60    61                                    68    69                        74    7S EVENT OESCAIPTION gl In Mode 1 operation the inoperability of RMA-6 vacuum pump on three occasions, due to y o9                      .
g l thermal overload, caused the loss of two of the three RCS leakage detection systems 7 09                                                                                              .
mg l contrary to Technical Specification 3.4.6.1.                                            Redundant sampling was available and 7 09 Ql utilized. This occurrence was repetitive. A temporary cooling fan has been used 7 09
    @l pending a permanent solution.                                                                                      (LER 77-57) 7 89                                                                          paug
            *So'E          Cc"OE                CoMPoNTNT CODE                      R                  Cr    A          vot.Afon g l Bl Bl lBl                            l PJ Ul Ml Pl Xl Xl                lAl              lTl3l0l0[                      ]48                                                          ,
7 89 10                      11        12                          17        43          44                    47                ,
CAUSE CESCA:PTION                                                  ')                                                                                                            ;'
oe l The cause 'of this occurrence has been determined to be a thermal condition causing the 7 89 g l tripping of the vacuum pump. A temporary auxiliary cooling fan is being utilized pend-7 89
    '] l ing resolutien by Production Engineering.
si s                    % PoWEA                  OTHER Status            sCo EAY                            03CcVEHY CESCAPfCN 1          lEl                  l 1l 0l 0l l                      NA            l    lAl        l                          NA 70          9                  10              12 13                            44      45      46 ctEYS            oF                    AMOUNT OF Acievtfy                                                  LoCATCN CF RELEASE 1
W                      ELISEl                          NA            l 44 l                                NA 7 8        9    .                10      11                                              45 PERSONNEL EXPOSUAES NUMBEA                TYPE        oESCAFTON 13 I 0l 0l 0l 7 89                    11 Wl 12      13 NA PERSONNEL INJUAIES NUMBER                DESCAtPTCN E  lni nl ,l l                                                  NA 7    89"              '11 12 OFFSITE CONSEQUENCES
      ,                                                                NA                .
l 7 09 LOSS On OAMAGE TO FAC:LITY TYPE        CESCA'PTON                                                        .
1 7 80
          ]        10 l                                              NA                                                                                                                _
PUDLCTY gl                                                                NA 7 89                                                                                                                                        %
[N          ADDITIONAL FACTOAS See attached Supplementary Infornation.
(s_y]g gl io I                                                                              n/                          8 0 02 270 6ppr                                                  _
NAMF.
tJ. P. Stewart ,              ,
PHONE    (All) 866-4159
 
Suppismentary Informat.  .
4.-      Report No.:                50-302/77-57
          )
ss_s'.
Facility:                  Crystal River Unit #3
: 3.      Report Date:                29 June 1977                              .
: 4.      Occurrence Date:            7 & 9 June 1977
: 5.      Identifica' tion of occurrence:                                        ,
Inoperability of two of the three Reactor Coolant System leakage detection systems contrary' to. Technical Specification 3.4.6.1.      -
: 6.      Conditions Prior to Occurrence:
Mode 1 Power Operation.
: 7.      Description of Occurrence:
At 1310 7 June 1977, 0145 9 June 1977, and 1125 9 June 1977 the vacuum pump for th -
gaseous and iodine leak detection radiation monitor channel RM-66 tripped, rendering the monitor inoperable. In all three occurrences the action statement was entered            i and the channel restored operable within the six hour time li'mit.      The first occur-    .
rence was due to a thermal overload trip. The trip was reset and the pump started          -
normally. The second occurr'  e nce was due to a blown fuse in the pump control circuit.
The  fuse was renewed and an auxiliary cooling fan was temporarily installed using the  control circuit of the pump as a power source. The third occurrence was also ws        due  to a blown control circuit fuse. The fuse was renewed and the power source for
        )        the  auxiliary cooling fan was changed to an independent power source. The pump has d              not  malfunctioned again to this date.
: 8.      Designation of Apparent Cause:
l                The cause of these occurrences has been determined to be a thermal condition causing the carbon vane pump to overload and trip.
9.' Analysis of Occurrence:
There were no adverse sefety conditions to the plant or general public as redundant sampling systems were available and a temporary pump was available for this monitor.
i
: 10.        Corrective Action:                                                                              I l
A Rcquest for Engineering Information (REI) has been submitted to evaluate and                  I recommend a permanent solution to this problem.
: 11.        Failure Data:
This occurrence is repetiti e as discussed above.
1
            .            _.          -                    -_          _ __                  . _ - - . _.  ._}}

Latest revision as of 12:45, 1 February 2020

RO-77-57:on 770607 & 09,RCS Leakage Detection Sys Inoperable.Caused by Thermal Condition Causing Carbon Vane Pump Overload & Trip.Request for Engineering Info Submitted for Solution
ML19308D239
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 06/29/1977
From: Stewart W
FLORIDA POWER CORP.
To:
Shared Package
ML19308D229 List:
References
NUDOCS 8002270694
Download: ML19308D239 (2)
v • d • e


Text

- . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

. Lt V L.l V U L L L V Ll'd I a i s .1 se n a (O

(

U CONTPOL DLOCKa l l l I l l (PLEAGC PntNT ALL RtQUtRtO INFCnt.1 AT: 4

-l 1 6 N E LICENSE NUMCtn . YE I ST i l Fl L l Cl R l P l 3 l l0 l0 l-l0 l 0 l 0 l 0 l 0 l-l 0 l 0 l l4l1 l] l1 l 1l l 0l 3l 32 7 UD 14 15 25 26 30 31 U

CATEcony tvp[ e$o'v7"g ocCxET NUMOEn

  • EVENT oA[E REPcAT oAft E CONT I l -j Lt_J lt i lo is lo I-10.12 In 12 I I 01610 I 71717 i I0161218l7I 7 0 57 60 59 60 61 68 69 74 7S EVENT OESCAIPTION gl In Mode 1 operation the inoperability of RMA-6 vacuum pump on three occasions, due to y o9 .

g l thermal overload, caused the loss of two of the three RCS leakage detection systems 7 09 .

mg l contrary to Technical Specification 3.4.6.1. Redundant sampling was available and 7 09 Ql utilized. This occurrence was repetitive. A temporary cooling fan has been used 7 09

@l pending a permanent solution. (LER 77-57) 7 89 paug

  • So'E Cc"OE CoMPoNTNT CODE R Cr A vot.Afon g l Bl Bl lBl l PJ Ul Ml Pl Xl Xl lAl lTl3l0l0[ ]48 ,

7 89 10 11 12 17 43 44 47 ,

CAUSE CESCA:PTION ')  ;'

oe l The cause 'of this occurrence has been determined to be a thermal condition causing the 7 89 g l tripping of the vacuum pump. A temporary auxiliary cooling fan is being utilized pend-7 89

'] l ing resolutien by Production Engineering.

si s  % PoWEA OTHER Status sCo EAY 03CcVEHY CESCAPfCN 1 lEl l 1l 0l 0l l NA l lAl l NA 70 9 10 12 13 44 45 46 ctEYS oF AMOUNT OF Acievtfy LoCATCN CF RELEASE 1

W ELISEl NA l 44 l NA 7 8 9 . 10 11 45 PERSONNEL EXPOSUAES NUMBEA TYPE oESCAFTON 13 I 0l 0l 0l 7 89 11 Wl 12 13 NA PERSONNEL INJUAIES NUMBER DESCAtPTCN E lni nl ,l l NA 7 89" '11 12 OFFSITE CONSEQUENCES

, NA .

l 7 09 LOSS On OAMAGE TO FAC:LITY TYPE CESCA'PTON .

1 7 80

] 10 l NA _

PUDLCTY gl NA 7 89  %

[N ADDITIONAL FACTOAS See attached Supplementary Infornation.

(s_y]g gl io I n/ 8 0 02 270 6ppr _

NAMF.

tJ. P. Stewart , ,

PHONE (All) 866-4159

Suppismentary Informat. .

4.- Report No.: 50-302/77-57

)

ss_s'.

Facility: Crystal River Unit #3

3. Report Date: 29 June 1977 .
4. Occurrence Date: 7 & 9 June 1977
5. Identifica' tion of occurrence: ,

Inoperability of two of the three Reactor Coolant System leakage detection systems contrary' to. Technical Specification 3.4.6.1. -

6. Conditions Prior to Occurrence:

Mode 1 Power Operation.

7. Description of Occurrence:

At 1310 7 June 1977, 0145 9 June 1977, and 1125 9 June 1977 the vacuum pump for th -

gaseous and iodine leak detection radiation monitor channel RM-66 tripped, rendering the monitor inoperable. In all three occurrences the action statement was entered i and the channel restored operable within the six hour time li'mit. The first occur- .

rence was due to a thermal overload trip. The trip was reset and the pump started -

normally. The second occurr' e nce was due to a blown fuse in the pump control circuit.

The fuse was renewed and an auxiliary cooling fan was temporarily installed using the control circuit of the pump as a power source. The third occurrence was also ws due to a blown control circuit fuse. The fuse was renewed and the power source for

) the auxiliary cooling fan was changed to an independent power source. The pump has d not malfunctioned again to this date.

8. Designation of Apparent Cause:

l The cause of these occurrences has been determined to be a thermal condition causing the carbon vane pump to overload and trip.

9.' Analysis of Occurrence:

There were no adverse sefety conditions to the plant or general public as redundant sampling systems were available and a temporary pump was available for this monitor.

i

10. Corrective Action: I l

A Rcquest for Engineering Information (REI) has been submitted to evaluate and I recommend a permanent solution to this problem.

11. Failure Data:

This occurrence is repetiti e as discussed above.

1

. _. - -_ _ __ . _ - - . _. ._

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