ML061940429
| ML061940429 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/24/1980 |
| From: | Southern California Edison Co |
| To: | Engelken R NRC/FSME |
| References | |
| FOIA/PA-2006-0007, R4-5A11 | |
| Download: ML061940429 (4) | |
Text
1/7,0f-4 02:35 PM*5
-/
Southern California Edison Company P.O. Box a00 2244 WALNUT OROVE AVENUE ROSEMEAD. CALIFORNIA 91770 Maxdh 24, 3.980 U. S. Nuclear Pagulatory C:=zdssion office of Dispecion and
_frmcsent*
Walnut Creek Plaza, Sui.te202 1990 Nrth Cliornia.B oulevard wanmut creek, Califon.ia 94596 AttenAti:
Mr. R. H. M3e3Jcm, Director
Dear Sir:
Doket NO. 50-206 San Onmfre - Unit I This letter describes a reportable oco urrence IrW6lvir~r aektAim c~moueitsin -the salt w ater cooling Wsyta vh&ddh arm required to, be operable tunr San Cnofte Unit I Technical Specc 3.3.1.
Su)3dttal is in acardanae with the rqpo* t of TeddmiCa
$ ealfimtic. 6.9.2.a.
at 2115 b*I-:
, Nmrdh 3D, 1980 with the unit cperating at 100peroo t
power and with the south m.alt wate r cx~gpump:(G--13B) inqpexatiaa, salt water oling low fo aid low dI. sch.represr"e. aXim"19were received.
on the main control zoa auxiliary board,a-nnun=ciator panel.,
mxcurrently, the north salt, water. c~olin 4
- p. p (G-l3A) atmtclystarted due ý,td lo pressure in the diadharge' line of south Pm G-M3 and pz d -M3 izotor aiqwage "m observed to b*e indimating low.
-et,:t.s me t
dip:tcahed to the e: salt water ooling pmp area and reported that-both putips were running with discharge pressures of 0 and 40 psig Ind7icated at -the south (G-133B) and north (G-MS) pzzpu, respectively_.
7hbe o perators.further reported that: the xBAImtc~al1ly ceat~ed discharge.
valves (POVs, 5 and 6) of eacb pzp vwe In the oseed positioni.
U.der the crditi.m observed, POV-5 (discharge of.north*pum G-13A) IshlM have bem tpmen *Unile FOV-6 (disdcage of south _mp G-13B)I sbdld htve',bee closed.
Efforts were then :idtiated to :ern -POV-5,
- 03/t1/'O~4 02! 38 PM3/
3/5 II U. s. Nuclear Regulatcry O=-ssi*
n Page 2 Xt 2120 1==, the auxilajxy salt water cooling pUMp, G-13C, was mually sarted frCm the =*Xt-oEb rv.
- er, a oIM fIi Wooeiticn as InAicated by lew zVzp mot=,.awqrage was cberved.
Investigatic2n of the auxiliazy puap and piping syatan indicatted that the low~ flow concdition van due to a~paret ZS-ficient pzzp prIming mid the auxi~liary pLmp was then utcpped.
In order, to
ýre-establish salt water cooling flow, the -screen wash pimps urar started fr=~
.the iocal panel ana valves mnualinly aligned to diadmage to the beottaa ccmuiet, 6ooJlng water heat exchanger, 10-2CB, orz ly served by the no*th salt water pump, G-l3A.
At 2130 lrx=,
malt water, cool1ing -9261 to Fe-20B was dezved to
ýbe about 2000 g* and -,cp cooling uantr tn
-at'e extIM F-2bB Was decreasing, having reached a peak value of 82'.
At 21,56 'hours, adequate -tn UWa restored tothe auxiliary salt uster pLo.pe G-:atb and.te pimp wasplacmed.i service.
tDurihg the perlkd described abcowe, a limniting coditica Eor qperatki aof Tedmical S Le tto 3.3.1.
wa, riot mat.
intent with theuP r ix".
of 'the seiitct that the reactor shballnot b atindCrit'icl wUless t
,hespecified limiting conditis. are mat, preparati Wren,., to oc.mm an orderly butz*,mof the =mt.
wever, at 2200
.ours with the. auxiliay salt
- ate*tu-ip restored to operaticn And c nsistent with the Ioni,,k r
of Tecnical Specificatio 3. 3.e#B, tbs unit dhutdom was te-l,1t*ed after '
slight load reducticm and. full Power operaticki vas resumed While nui*-n-elffts to "V c ea. At 0005 bours onL irdi 0.",e..17-5 warn cpens! and the norts -alt.wa.tr puap G-M placed in service. At 0010,.ours, with the orth sat waterp*ap-and the auxiliary pimp dete=ned to ýb operable,
- he auxiliary pimp vas nutýs! and unit'operaticr proceeded !n4 acftaMc with the limiting =mdutirus ior operaticai of Ted~ntcea1 pc~imix i
.LTiroughout, the Wb~m Incident, adequate coolIng was rraintained to equipzent
- roniy, served by the 6MpVnent CxxLing Water L ystau &ring p~er opraica The peak ompmnt, coling vater. beat exdiaxger eiot tI _, rature of 82'E' was well below the alarm conditIon setjxint! of 97-F.
T irtoe of pmp bearings cooled IV the a uinent cooling water. Syut~b ware Mmxitarad during the incident and no significant, dbiangies diverved.
iZnvestigaticna Conduced to date have evealed that the'soizt~b salt water cooling Puap, G-l3M, shaft. failed due to.. apparent excessive vibrtion resulting frau ~n bearings.
Mie-ptmp shaft and bear~ings have since bree repaired and the pimp returned -to sarvice.
T he failure ocf ovV-5 to, opMn' auaMtcly and the prdble of insufficient prInting of auxiliary salt water puap G-13C ýare Presently undler investigation.. Pndirxg the results oif'these in~vesigtir andiupem~tatrnof ~cpia long term corective,cin ACCS.to Freveant reurecthe following mm~vs are being taken to Lanmstr -availaibility cE reure sealt water cooling:
(1)
POV-5 Is being masintained open with'the-
08/11/2.004 02:36 PM
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EVENT DATE 74
- 75 REFORTDATE so EVENT DESCRIPTION AND PROBABLE CONSEQUENCES
~JI Wrim naml~ W~rtiMu, tbe south sailt -iate? WOoli prrp (5SW)
~tdiscarge I pEEsur dxcippeK sharply. The rcrth ma vater co=' ln pmp, (M::) au* t loai ly S:1 started.n lo pressure.
ammever, its discdarlge raoV faled toopM, The auilay sp (A..)
Una th-started b+/-t fla*ir ci:*a" be TII estabMiabed.
~here vas ýno effeact:
public health safety.
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VALVE CODE COoD.
SUSCODE COMPONEIT CODv SUICODE "U D"S' 7
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FUTR 24 20 27 L '*9
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COMI*ON TAKEN ACTION ON PLANT METHOO HOURS UDMITTED FORM bUS.
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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS oE I As a reselt of (1), =assive ib-a
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?epr (3) app in.eeqateo I1FrD=- the (Atl?) 2cat: -s=!:i=. -The WVn -the (~whtp) van rr=nufL~y cp~enw Ir' andl the (A5 regLM!aned ct'ICo. Design 'of the M.V and (A8!w) is izd 1
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