ML19289G092

Submits Chronology of Events 790328-790506

ML19289G092
Person / Time
Site:	Crane
Issue date:	05/07/1979
From:	Office of Nuclear Reactor Regulation
To:
References
OLP-790507, NUDOCS 7906260277
Download: ML19289G092 (6)

Text

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5/7/79 3v_3ao BKG CHRONOLOCY

//R/S March 29 Oh00 Event started with feedwater pumps tripped 0700 High activity in RC sample liner - Site emergency 0730 General emergency - high radiation in containment 1045 3 mr/hr of# site levels RC nunn IA turned on March 29 First post-event primary co o l a ri t sanale taken for isotocics (1000 R/hr on contact) - maj nr 'uel releasas indicated analvsis waste release to river of stichtiv contaminated water - terminated at NRC request (resumed on March l')

Ma r :'- il l!30 Chairman suggested evacuati,, o

,recnant women a-J r

children to State N,n-:cmde sae cas bubble id: 'i#ie f - sevore 'uel ca-ace indicated bv prima y coolant sa aie resul ts but neiting not iikelv based on isntopic ratios-NCC in',r,ed that contain ent ores:ure soike n' abou* 30 nsi,ccurred at 13E] on." a r : h 2' Jenton and cc,can" arrived at site at 2 p.

- (R3 NRC o -site),

a r : '- 71 J2gast i" redece cuuble ice.

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• contain en air sample taken 'or isotopic aral" sis r lead for shieldinc arrive in-site.

All ther-o-2 ' t,ns o coun1e be!ca saturation.

'ri' 1

Non-c,ndentable bubble size sieni#icant iv reduced.

L' x v c e n buildu^ c, clu Je J to he muc" less thcn previnuti" conservatioel" esti ated.

s,ril 4 Unit I solid waste shipned from site to Snuth Ca r71 i a.

T'ril 6 Waste gas tank vented to cn,tainment but terminated on high au<iliary building radiation readings.

RC nump 1A tripped; r

RC pump 2A started within about twn ninutes.

Venting o waste gas tanks to containment successfully resumed.

April 7 Sodium thiosulfate in sump to 'i iodine - (wo rked )

Apri' 9 Noise analysis indicates no bubble in either steam gererator, but some gas in svstem near h00* psi.

Some RC pu a vibra

• ion at I r.. (400 psi) oressures.

April 10 LT-2 pressurizer level spiking.

LT-1 observed inoperable.

Onerating on LT-3

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Chronology Acril 11 Second prinary coolant sample taken for iso;.

c analysis.

River water pumos for fan coolers shut down because o' leakage - later repaired.

Problems with letdown flow when pressure reduced to 42C psi.

Aoril 12 Lost LT-2 p res su r i ze r level cnanne'.

Pressure reduced to 300 osi #cr final offgassino.

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11 Hvdrocen recomoiner trioned off.

LT-2 nack on inter-ittent!"

Boron concentrations show 3101-1520 nr,.

eCroldown o# ori arv syste initiated Sy coerinc valves t,

turbine.

noril IL Pressurized primar" coolant sarole tat ?n.

ri-st auxiliarv buildino filter removec for channeou' caril 15 A^ril if H drogen reco-biner restored tn servica.

i Aori' 10 A -11 19 i: Turbine rollea at ICJ rpm outling vacuu, --

.6, 179e r i no boil-#f te nerature and reducirg cricarv syste-temperatures.

April 20 Train A Auxilierv Buildina charcoal filter changeout comolete.

Added two gallons of hydrazine to control primary coolant oxvgen.

Deluge systen B train on aux building initiated inadvertently.

A t rain put in service.

Systen cool d own stopped at 175F, turbine turning at 250 rpm.

April 23 Recombiner placed back in operation after trip.

Acril 24 Fuel handling building filter

'A' train replaced and in service.

• Turbine tripped by operator because of water inningement resulting from transferring '!edwater flow to auxiliary feedwater nozzles.

Average c.olant tenperatu e increased to 224F.

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Chronology

_ 3 April 25 Aux building "B" filter train changeout and put in service.

April 26 Ai r ejector monitor increased in preparing to steam on 3 S.G.

1000 and attempt terminated.

Acril 27

• o915 Pressurizer level LT-3 (las t instrument, eratic earlier) failed.

Natural Circulation successfully initiated ahead of schedule bv shutting down RC pumo 2A at 2:00 o.m.

Short release of activity observed - thougnt at first to be iodine bv TMl staff, later con #irrec as xenon.

Returned to background wi Sin L hours.

• 1600 Natural circulation on 3 1,op ceased - later concluced to be because of makeuo water addition tn 3 loop cold len.

Acril 2 SJ 110 Steaming o, 3 S.G. stoppec because of indicated inc ease in vent stack acti' tv (later eaund in be a necative readout cause1 bv cnance of cartrin :

Aoril 29 Hignest incore thermocouple readirc:

32CF, Su p level estimated at Si feet Sv Met /Ed (L25,0:0 gal).

Source ]f water since first dav thnoght to be feo, corn 7nent cooling svste venting losses and primar, safety valves.

Both sump puros in contair. rent inoperable

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3HR upgrade - T.V.

cameras operable.

Mav 2 Two trains of auxiliary building suople ental filters systen.

Seal f i ms to all RC ounps reduced to 2 gpm.

Hav 3 DHR upgrade - accelerometers installed on pumps.

Heated water introduced to 5 cold laop as planned.

May 6 Third train of aux building supplemental fil ter system placed in service (b r i e fl y run 5/4 and 5/5).

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Vollmer 3.

Grires J.

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'.' e r : - : c' waste ges tanks to cnnia men-s ut:es s 'a : resumed.

' i- ;odine - (w o - k e c )

odium th:ssulfate i-su : to A. - ! ' '

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'o i r e ana l vris in icates nn b u t;b i e in e t:her stea-cenerator,.

out s : me ces in system near LO: 'n s i

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• cu: n vi: ration at l ov- (LCD ps i) pres sures.

o'se-,ed inoperaole.

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c Rive wa:e-oumos 'o- #ar coole 5 sne: c ae r recause c' icaiage - later repairec.

Proclens with letcown flow wher.

cressure recu:ed ::

.2 ps Ao il 12 Lost LT-2 oressurizer leve! :nanne' F-essure recuce:

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300 osi for final offgassinc.

-- ' ' 1 Hearager recomoine-tripoed o'~

LT-2 cack on interri*te-l'.

B a r c-c ^.n = e r.t ra t i o n s show 3100 C30 orm

"-C oc i c ow n r# nri-ar.

syste-initiatec bv caening valves to turbine.

-r-T' iL Fressa ::e:

- i me -' coola - saro'e take-C'-s: aux

'ia-o bu;1 cine fi!:er removed fo :hanceou:

Arei l 1,c cr:

16 Lvc ocen eco-bine-r e s t r. r e : :- service.

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April 23 Train A Auxiliarv Buildinc charcoal filter en.a-neru

Or:lete.

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contrO c sgen-Celuge svstem E train er aux buiiding in: iatec inaovertentiv, e train out in service.

Svstem C0cicrwa stoppec at 1,,, r, turoine turning a

, 9 ;- rpr Acril 23 Recombiner placed back in operation after trip.

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s train repiaced an_

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.u e,. han l.eng bu.lc..ing f.lter s

service.

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tripped bv operator because c. water iroingement c

-iuroine resul t i ng f roen trans# erring feedwater f 1 3.-

to auxiliarv feedwater no::les.

Average coolant tempereture increased to 224F.

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April 25 Aux auilding "B" filter train cnangeout and out in service.

April 26 Air ej e ctor nonitor increasec in orecaring to steam on B 5.f.

loop and attemot terminatec.

Aoril 27

• o915 Fressuricer l' eve l LT-3 (l as t instrune., eratic earlier) failec.

Natural Circulation successfully 4

initiated ahead o' schedule bv snutting coan RC pumo 2A at 2:00 p.m.

Short release o activitv f

ocserved - thouch at firt: to be ind:ne av TMI sta#f, later can'irmec as xenon.

'e!ur;ed to background within L nours.

• '6]C

• stura' circulation or 51 0 0.~

ceasec - late-conc ucec i

to oe oecause of makeup water accition to E '000 colc leg.

Aeri! 27

• 011C Steaming on 2 E.G.

stoopec cecause of indicated increase in vent stack activity (la.er founc tu be a negative reacout caused ov cnange of cartricge).

ori' 29 Hignest incore thermoccuole reading:

32CF-Es o level estima:ed at si feet oy Met /Ed (L25,000 gal).

Scurce o' water since first day thoucn: to ce ' rom component cooling Svste venting losses and primarv saferv valves.

Ec:

sa,c pumos ir ccn ainment inoperacie.

May !

OMR upgrade - T.V.

ca eras cperable.

hav 2 Two trains of auxiliary building suoplemental filte s systen.

Seal f l av to all RC oumps reouced to : gpm-Mav 3 DHR upgrade - a c c e l e r ome t e rs installed on cumps.

Heated water introducec to 5 cold loop as plannec.

May 6 Third train o# aux building supplemental filter system 5/6 and 5/5).

placed in service (o r i e fl y run cc:

V.

Stello R.

Vollmer B.

Grimes J.

Collins F.

Miraclia Chronology File O

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