ML19308D239

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
Issue date:	06/29/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D229	List: ML19308D228 ML19308D239
References
NUDOCS 8002270694
Download: ML19308D239 (2)

Text

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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

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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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