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Incident Investigation Rept B-350.On 750613,Oconee Unit 3 3RC-66 Stuck in Open Position Resulting in Reactor Protection Sys Low Pressure Trip
	ML20024B256
Person / Time
Site:	Oconee, Crane
Issue date:	06/13/1975
From:	; DUKE POWER CO.
To:	;
References
	TASK-*, TASK-GB B-350, GPU-2333, NUDOCS 8307080097
	Download: ML20024B256 (43)
	v • d • e

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Inciden: p.epor; #5-350 '-t.*.'_. -. ~ h. 4 ^ ~ . '. - -21 ca s tr.it 3 TriF (12 s ".*.n. a -e I -. - %.c-c '. y ~ -:n c a -M ..i *' f: '.] ...t.? .~ M.,: u ' ~ 2.0 :stroduction .~v.... i . s.. n..:J' ...Q. 13.1975 t'ni: 3 was shut:ing dovu for R:P saal na t: - TF. 120.Gie. An R 5 .:-y; 1439. the : ubine was take:. into manual at 10: On June ,~ y.. - - i : relief . C h -fi..< 'j l.sb,S pressu:e spike occurred.cpcr.ing the power actua:ed pres A: M -+ E '

i. 4f L;J - Q. N d"5 tion burst, the reactor tripped on low R*5 pressure, and an EFI IS actu IM valve (3R066).

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he sta: ion tanager was notified at 1450. the seneral office P M. M. c.:.. f. x..,

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..R. ss 31.39:17 placed the turbine station in manual. ',.,,G y :. K....:,v,y ,.- 3.; l q. . * > *. :3 3.,,,,,,.. MS19 and MSI: opened. 3 Sg,.;, - A ra;i%'.~e bg~f I ..h'- Q:- shif t supervisor A took the MS bypass valves in manual il 49.v. fZue A - :

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3440:15 Control Operater A 4 -..[: -* n -,' l ....-o 3440I45 Con:rci operator A notified Assista:: Assistant Control .1 a v.- that RCS p: essure. ras svinging. y Operator A began rue. ing back lead on the turbine ? ' 4 j, ~'.';'. { - ; c,.1' J c.. . :ch generatot. J. 8 y.;r. A took TJF A in manual. . n

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N) 3 panel did not indicate tha:
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R03 depressurization began. Mir:c: insulation "he quench tank rupture disc burst. If.41-1445 was blor eff the bo::ou of the pressurizer. i 5 %/' ~q' 2.1 Assistan': Control am m... t' ult load reached approximately IC PNe. % ry.". ...-s.j 3441:52 ^ Operator A cpened PCE 58. '. ' f.y '8C:17( y . ; j,g 7.? Chauntic E & D ::1pped en low KC3 pressure, trippin .. fp.. 4 ... m a.: ; Q 1442:40 t.. ) the unit. F 3 39 opened. = . l\\..ih.* 4.ff *. 'f ' " ?.,@ .; gr .., -d qrt '\\.Lt 9h;.?.-~;. - ; :. r2 w r d.g .~. . g. s., ....-a~.' .e n g. ~, -a ..2. .: ige -~. -: %_) ~y .w a,..,w- -q w eq %a .x.- a. 1.',.] j c ~ %,... As-n.;;

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-: Q, - Ill f5-350' w. Fase 2 ,,-O. C .y; . ). ; ; ~ ~..x z~ ...^ c. q .y 1443:20 .n Con:rol operater A started EPI ptarp A. g., 3 Con:rol Operator A cpened ET26 to bypass EF12C on -a the E.S cakeup lina. 4 J.a... .7 1&&&:45 ES preasure reached 1500 psi. ES HP inje:: ion actuation ..n.. a {.3,9 y, p[' a occurred, autosa ically starting EFI pis=p C. - a v. { .0 7.- 1445:00

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. "Nj$5, 'idf O .eQc c' er7.pa...:... s.r.w. 1447:30 control Operator A c.losed JitC4. ...gn - g-,M 763-- "..M ' 14&7:45 'q. ;qiQ - P:"" dW :.a h.'.&,Q Con:rol Operator A opened 3E4 ) ~'Cm$ ni,. d,' 9, ' w., 'r*43 Pressurizer level reachad 367 inches. 1500 .I ' dc.f kd r 'c ,.0..... era 1506:30 Control operator A closed 3E4 ,.~.. /.,.,.,'. '.., '. f. :f.'.3 i 1507 ~ - -.U :.'M. b. RCS pressure bo:tomed out at,720 pai. 9 {

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1509 1 &s. The transie=: vas under control.

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'"ft.q., : . ~. ;, -@M.. e r ./- 1- ~'. 1550 RCS Tav reached 429 T. .<.c :. + 47. S. ". .O .,,f 3.0. Ivaluation . r f.gArn~~ . ~,';2 '.:~ * -f^. ?. -ri 7. w, 1. The Causal Initial oscillation: ..g., w -s .3 Jpyj J']s was at about 65 We..but 115 We were being generated. 4 -^ - 3efore the turbine vas taken inte manual, uni: load demand (C.D) . '.4-f -;.. h",4 ;.,. ~ This dif f erence -..$,4.'y existed because the re.a:ter was opera:i=g at its icv licit of 151 FP while in au:ena:ic 2CS control and could not follow V:2, fur:her down. e ....e-F w,' When the tuttine was taken into manual. C.t was less than 90 We, so f

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-d MS pressure control was svitched to the bypass valves. i pres'sure was 910 psi, so MS 19 and MS 22 opened i=nediately. MS A rapid M5 pressure drep to about S75 psi occurred, at which peint the bypats valves closed. Meanut.ile CI had autcr. atical.ly run up j to match generated negava::s at about 115 We, a that XS pressure ^ was no longer con:rclied by the bypass valves. The bypass valves .7' vere taken into manual before load wen: belov 90 W e. (see Inclosure 'M .:.m '1; 3. C. D. and I) , k. '. ICS Tm' puzy de=and, which could not handle the rapid C.D increase. MJ.., ,d vent inte ac escillatten which diverged af:er about 30 seconds. 3 - y ' V It was therefore necessary to take the feedvater pupWFW l %.A ~ . zi manual. a g ..-3 ./ i k to stabilize O!SG 1evel. ,, i g-CTSC level svinge eau m. g.f,, T ' gb '. d pressure, and power svings; RCS p;cssure spiked, dl esper 3RC66. wac .. -' 2.?b, (See Enclosure 1; T. C. E. 1. and J)

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Rowever, au:ceatic feedvater centrel ens ne adee :s t e. indiesting Q~. N. that toe W **---- *.*-e.e t *. e re: H cr.ange it r'3 that occurs 2 6k..-...'- w-s s le.my..r- - 4 -vnen ne re-tine u reece te manual s.11e a la re t 3/rerersted se e111ere=::a; exists. g. Mr,tc.m] .a.~-: ?." .: - ~> II. The 31066 Failure -yM; - : c.Q i::E--Q -.~ WY I4 M I.@ [ 2 M 3E 6f opened properly when RC pressee reached 1:s 2255 psi e se: point, but it did no: close. The open/ closed lights in the V,P"ti:R.w N 6i control room did no: indica:e ths: the valve was cpen. v. ~.~:. w .jp h -U:?'A* 2 v'. 3 .yd MeM,%%.D';C.d rpen inspection, the lever a:3 of the pilo: valve for 3R 66 was Y, M 7. *Y N: E ?Jh 7@g&. E f ound to be stuak in the c' pen position. ~his sticking was due to N T-M.y.P3 heat czpansion, boric acid crystal buildup oc the lever connecting .N

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i P n. and hinding of-the lever against solenead brackets. m@Wn"... -, -. M, ' The solenoid operator plunger was also found to be stuck in the - - tv- - iJ lfR EUG.. i~$ open position. A bed: spring tra:ket above the plur,ger had caused W. it to stick. (See In-losure 3; A. E. and c) " ' %,i. dO( The position indica:1em failure could not be repeated. It could M ' % Q ~< ;.. d have been caused by sticking cf the sclenoid plunger at slightly less '.M-"; '. 'M 7 than the full cpen position or by the crud buildup around the plunger D.~ * -.. >. ' '.. '. f.. ?.1 .,++, e, ?*1 ,~... operated microsuitch to the open/ closed lights. + 4.. - ,.e... w 9 T. N~* s .*. ?, a4 '.: r. * * %-/d.z.'" 4 ew A -1 w %.,4 ^ '$ f Mg;d -F ~'" 'Q :f L.";- q , :.<.. ;M: I:1. The Pressure - re=perature Transien: .,N + m."~ sT d ,..g.w y-~~%.M because there was no ec=:rol roo= indication that 3K066 had stuck s ..e==* -tj open, the reason for the rapid ;ressure loss sas not oWious. 3RC4. the blo:k valve := 3R 6f was closed fer abeu: 15 seconds ..g when RC pressure had reached about 1300 psi. Ec cha=ge in the ~ pressure transient was observable e.2 the vide range RC pressure chart, and a rapidly rising pressurizer leve.1 pro =pted reepeting e. ..' 1 33C4 3R04 was again clesed at abou: 600 psi, and the pressure transfect was brought under control af ter a total duration of 26 e.& d sinutes. (See Enc.losure 1; K. I., M. and K) .'.g. ..- p E*y,: Wjfj 480*F. 7e empedite evaluation ci syste= da. age. RCS cocidov= was When the pressure transient ended. RC te=perature had dropped to .c -.ew -9 continued as rapidly as alleved. n.is rapid cooldown rate, ccur.bined 1 2ha -- .';.0-4 with the R te=pera:ure drer du 'ing the transte::. produced a A.j@M.t.. _.f.'.M / f 102*T/hr rate exceeds the T.S. 3.1.2.6 cocidovc ra: Nh {. 4.:-N 4 ten;.erature change' f ro-530*T to 4 c'T in a cne hour period .U..h,A i ./ below 530or. (See Inclosure 1. P) p w H% m.a -d e we,., e.v;M.

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-we were viciated ferD cinutes[acc.9 hr. and m -. a A cA 1) [ 'I ~ N .(See Iselcoure 2; A an u .s ~i' sinntes, respectively. ~ . f.4

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^. .t....1 H and coesequest ruptere of the quench tank a ne failure of 3R:resulted in releasing met more.har.1550 gallets of r.ege t .c m,. llMy :Q.E. ' ;.... n:,;.:5 water to the tsactor MW sump. yM rupture dis ,.. ;w s ~.; ; ' M k,.' ne following is a calculation of the amount of veter released -f ~[ T..@..s. h) '.d;. -,.j,-. to the sumps -(-d-pu=p A was on for 16 1=utes 22 seconds . ~. ~ :..- - -. .e. - %,, 66 was cpen. ET: For tem seconds. JEP1:0 was not bypassed s.. While 3R %.f: - ; ;:.- at 3D0 gym. "L*. % T. J he.2.C5 cooled zakeup was limited to 303 gpc. ,, ~ ~ ~." ' y to pre-transient values as the cociant loss ended. 0 D down from 579 7 to 47,6 T. '.;;. 12 k.. :. V-c ] ~4860 gal, = ... =.' 16 m,12 see at 300 sps .,. f. . i. '..rr?- Ji A 17 r al _. = ... ps - 10 aec at 100 gym J,. qq:.s.hy E2h::,E' W 3 4S77 gal. _3336 ral._ M.y.N (( -. -.h.1 System 55rickage 1541 gal. . ' O.1. 3._+:.) NM<.y. bi[' E . ~ Scoe of this water rc=.ained in the quench

uk (velume.

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S.* *p, 2.g ;. '-_' '}, Attivity increase in'the reacter building vcs small, with none o '.-I M., f s. decade ~ c.] the radiation acciteri=g re: orders shov1=g as :=2th as a c. rA ~ (See Enticsure 2: Q and I) Eealth Physics d entry W increase in counts. .S personnel san;1ed the rea:ter building scrivity and appreve ' '":*b';h 4' 3 for inspectic: within as hour of the transient. ~T. Cer ponential Damage Y.ir c insulation was, ne quench tank rupture disc was bles.cf the pressuriser, exposin -d .1 blown off the botto: i = -- 9 gep., r. .y 4.D Corre:: ve Action _ . p, t e;,...f ;... ' 9,.

,. v.g b " O &. n e Causal 1sitial Oscillation e

' :i 1 wpW'*.. ~' T 'T ' .-..h An Instrument Department representative has tecommende 'f -'h & -.:Q f "') 14.- be made to all three unit shutdev procedures that would prerunt .f- [TMN-running IP.;D belov 120 !Ge befcre = - d PSe

ad habThis would prevent the existence cf large C D/ generate

{. -w . *,4 f..- C f differeatials. .. w n a ' ? ~- .. p.~ COUNSEL ON ', {.7'.. -] s t# a%m ~ , ~w.. e,.. ...x.., qg ,f@ .g.;-y.;.g c.y.4'g,.m. g .1 ',%- ['~d. 7 g;, ,. ~ ',' f(- .- ~.. 7..g a-...*~ g g.g.,.; y,. y.3... m$ p y 3 (y._._, z .g. g ; g 3, t y,*+,:y G - j 3* g.,...

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s-.- II. na 3E66 Tailure .-y 4; 3F.C56 was re::::rred, repaired, and replaced as per M #02647 WC g y (E.v.20sure 3; A) l ~.. .3 .J 4 { c III. p-',..-..~~<.,m The Pressura - Temperature Trar.zient u i K*SE curve, and fuel compression curve viola y.y.! J " i. f.

~ W ove rate.

office. g..u. +.- .. a e general M..U," :.,,,,. '.(w+.j 2 TY. The less of Esactor Coolant ta' the teactor Building ..t..,. %'Li;p,=. :. '~' -~ ?. ..f 4 =..~ ~- = J,g 9r h. ~f.M;J,3 c.;;g 7. Processed routinely.The water in the reactor building sts:p. which ~ d p% Mr...r.! - r:; ~ was cos:pleted on 6/14/75. Cleanup of the loose va,ter in the reactor bu e, was .v y.._ w p,=...n..%.,..-;- 9 cme - .k$Q.fjWQ ~ w lh s ..g.., m., w...- ,4,,. ~e nc ~ -.-... :.m,,. ' E bia ;M..*. A 2t is recomended that cot.r.rol' room operating herso=nel be ..q d:"M w. cf this occurrence 4e. p.. g ,..,n,,...W..,u***e that it=ettate e7erure of P.Ct is the e-made svare Er M.. a. ' "? ' . q

.@ ' C , 'M T.

.]f Componential Damage .a .Q he tuench tank rupture dise was replaced on 6/24/73 as per q y;;;. y ' ; ne bo::e:s nozzles on the pressuri er vere dipenetrast te.sted fg<>- 6/19/75 as per LU M649A. 02666A. ~~ 5. pressurizer on 6/21/75. P.irrc; it.stlation was replaced on the dQ

5. 0 Te-i*iestion

~ b at.M .A d . y;,s.W '., d .2. K/A ,...a.- +s II. 3 ne 32C66 Tailure 3E4 is closed to perforu the 2285 psi RCS pr v$en startup. or to 1 d .,1 - F 1 m. x/* .w . e... = n. ,1, N.Y:. d G ~ COEDM. 4 f ~a.. '.f 4/AIAU.5. p. 'y ~,< 4y a,w' r. ,. -g

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CD? .p I."..," .f Y. Coc:ponential Oasage . %.J .6G. Ibe quench t.2nk is back in operation and fun tioning propcly. qe. ;. a - ~:I =.i; a -1 6.0 Safere Analvsis ~- 4a ? m -*y ; ]h

1 No redisactivi;y was released to the e=vironment. The IS actuation

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.'O'I/..O.T occurred properly, preventing loss. of cooling te the core. .'?N'h 'E '.?._ 7 ? * ~~ 'r,.h -t.; a.?.-! J'.!- < The haalth and safety of the public was not endangered.~ w s c<-. -- u a . my.-A ;. g"....... : ..n .e 'm ..w .j 7.0 Inclosures c..v .....S s s.

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== A. 11 Power and Generated 2Ee -.'w w.e .y.p,;. 2.- d 3. C'D and 3sae .a . v ;.. :.-., 2.. ',. ^ s .d h C. }Ge and IF Talve Posftion ,,y.. D. SC h essure and EF Talve Position %. m.. G E. MS Pressure %'.B b.g;.... '. qj m g.i. F. MF Dewd and II.D e,Q ..,s ...-.u._.. C. N Flow

.:. ~.:.:.4

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4.1

.r K. P:r Level (Control Isom Chart) ~ e D. LDST Level P. RC T L7c (Control Roon Charts) h Q. 7.adiation Trend ... ri ? g, m mg,, ... u. ..-]. Safety Linits & Precauticus curves D,Z.,

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+ . ~..- a. s suriz.ation-4/13/73 s-*...a ~ r - 7; ^j.

1 Attached for your 1rf a w 7' -: .d 3* P

.V ' '-J. .j hi:qEehn wt.itt ena y, twrt 3.1973 2,;;,, g,,, 8 82 7 -Q. .he r:a:Wich occu red as.?une '3 1he depressurization og og,,,, '; t- . ) Lon Perferr.asce Crois * **P 881Me for ana3yzing endIt is ry u

cetur.aa ing data in resm.

. * ~ ', ~j that design transim ma'.* 'P*Teting tr Jd b 7 code and regulatery i.quir M* W^ *1ansie::s and assuring n. m. ~. ..-x.. ;,. _ 7 N :ed as ident:st.s man Ay p ..e .. _. ~~ : 7 I L 3. Canady -a /

3.. ^;,

Attachamaz Mr ....m e -a 8.4 M

- - W. J. L Stich

^~3 ~* .N .S D .=.s' W.... t' i. ..m .w ... dys ~.. CONFIDENT!Al COUNSEL ONLY 4 ~- --.. {^ ,;..,'..e. '**T.4&- M 1 tc - .,.gw*..d,..Q'4 @,- -s D.. .E' - ' O.** ' "YDW SIFQ %sG$$ h.t-M.'Nen_4W.-= -. ......C ;S $.

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.; bo' DLWurzu's vau tes_

J y f J.,: ; ;: 1*q te.e::nre tsA 3ssii11 .. ; m ;f ~%. u...... ~. .r -3 August 1.1973 wc~; n,

1. 1:- : :. 9

"' 'q 37, g,, g g,,,g d y --.a'N :ll..:. , ;r - { Ma=ager. Projet: i' < Yt

x..t.:-A.,

. Duke Tower Con;,anyCoerdisatioi. & 2.icensing E.. - w .t 8 e...!- . ' 9'.. ;,. 3 lost Cff1ce non 2178 t 'l - -C ' ~ * .p,*;. ~~..; ;* l +J, f:..:.3 Charlotte. North Carolica .,,f . Q..,ir'j2_'.(9:.6.ng 3:?6.b* t "I" ......n.;. 2E242 ~;"/* g J- %q. u.-r ::.r 5.r. -~&'?2J .._.rf Suhjects r i ,'J;7,y?"..:. *:-- T G'h Oconee Euticar Station 6 .o Veit ul cocidews Transient f: r-..,.... "4 ~

r. aster service Task 047 T...

Dear Emma ..y. -r;.. n t

g

.a q; At Duke's request. we have reviewed the data r l

j ;.,,...

.4 .and depressurization of 0: ente E1 which ocrurred during the rea:e

s...

on June 13. 1975. u1:.;f;*'.. fc11ows: Our review censidered :ve aspects cf the trans1 i. ter shutdown p.' '*, e: - . ~ S. '.?'.a l - =st. as ,.CJil' M.,.td..,' Eclation of the limits for **w.at R A. -d m a.";"1' . -0 Precautions).to maintait fuel at co::pressico (Tigure 10 3 2 pressure as a futetion of .. fl. A.._..~.f- ',-%..,= cf UP 11Cl-C11.izits and -.g g.4. jf$. - Based et our a:alysis cf the trans*er: ,,J,.c.. r.,. advised *.r. Schmid by te.letos cc June . shown in the atta:hed figure, we ,g duced fret.71 per hout te 3*startup feliceing the subiest transiest.

15. 1975 that c the icitial 3

j .,%.[* ;;..;.

Q the startu; rate sheuld be re-This will al*ew additictal time for the h*dride fl t lPer hour betw power.

~. g re ieto aclutiet. damase to the f uel c.ladding.thereby precluding the possibil.ity of long t r i".~.,. a e ets to "~ ' T ':. ; h% aa .L 2. Pessible vielettee cf the ;ech. Spes. criteraa of chasse cf 10~.*T per nour. a maxarum tes:perature A rev:ew of the data leacs te the fellowing s1=plif . s 77 l 1.ne. icatiez cf the tra=riest. 1._ -..

ressu o Start - I' hr. 41 cit.
e->eratu e (Het t.et)

.t. T.nd - 13 hr. 10 mit. 1100 psi j 700 psi StS*T 504*T The duration was 18 titutes and the total temperat

j rata cf thange durits this tir.e cf 174*T/Er.

ure change was El T. or a J. }k; [,k. by ~ ~ ..Au COEDMW. 4~ c %..... s.Q,. c. r ~. e. ::.c.+.a ,a r.. .w., a.. a. m, - -.Fs. V. .. r.~ _... W... i m s ..o g wamo:.a :c - tu,:=:m -.:c. ,e.v a. =

6

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- ]

1

- 1 T

] 77 compariso=,the rapid depressurization sta=sient defined in 3&'s 1.".5 .] 1 Timetienal specifica: o. contains the fc11oving.. J Su stiet Pres s u:*e Terwrate o j. W ( . h. ~.(;.,,, -[ 15 avn. 1200 psi to 800 psi 560*T to 50C*T d 'ib. .$ ;f This results in a OLC*T/t:r. rate of charq;e ti..ich is slish:1y greater than 'j S ~ - y 3at which occurred on June 13. 1975. Also the pressu e decrease is W... .J 4 co= arahle. Bence $t is concluded tha: the June 13. 1975 occurrence J ..-.m..'. a..,L.... - -.. .t should be classified as a rapid depressurization transient. ... - + a 5 1 Since ne conditions of the Juce 13. 1973 occurrence vey close5y apprezimate 2' .4 i rapid depressuri=stion. and since rapid depressurization is a:aly=ed in ' ci the A5'f., See:1ot 111 Stress Tseperts it is not necessary to perfore any j edditier.a1 cal:ulaticas. he ASME Se:: en *11 cri:c-ia was snet for all

'i analysed condi: ions, and it will still be met.

i ..J' s

v,:

i - Z The cencern ever viclatter cf the Technical Spec. criteris cf a n% 1 teamperature change cf 100*T/hr. is not ap;1* cable in this instance.

{

.3 By including a definittet of rapid depressurization i= our Tunctional Speci- ^': . Ji .1 fication, we ad=it that Eis cac be exceeded. 1 is not of great concern 'Q. at high te=peratures since the compone=:s are well above the FMT which -4. 5 could lead te a no:-du:: ale f ailure. 1 is difficult te define all conditions whee 10C.T!hr. is or is not applicable thus te simplify, a s1=&1e criterion is included in the Tech. Spec.

p..

M le st-m y. the June 13, 1975 occurren: should be classified as a rapid d depressuri:stion transient and it cac be con:1uded tha: the RCS ce=ponenta j suf f ered no ds= age due te e.x:essive stress levels because this was no T. acre severe than conditiona previously analysed. .a 3 flespectfully yours. j "1C LAs:0:r. & L*.*.*00I COMPAXT c 4 4; y-. - .S. P. Bellaan Preject Ma aser. Tuel Tema '1 SFH/1ed ? cc: w/4 tach. I L V. Bostian (/jk P '"I T. 'I 'WD J. t. smi:h o- ,t . l. - - d. ' - .1

3. E. Telford

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m ..a ..d-August 5, 1975 -4 % w. A' g W';M ' 1,';. '...

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~ N.'. . - ~ 7_ 3 Mr. Norman C. Noseley, Director ~ . r, C -a -. ;.) U. 5. Nutlear Regulatory Coas:ission n. e*. ..f y,

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. Docket Do. 50-287 [ '.y;.. -. ;..., x,. - O

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Dear Mr. Mostleft a . H- -- d N-fi.- ,.g My letter of June i y .c.: ~'M Report AD-267/75-727,1975, trans=1sted to you Abnormal occ r Exceasive Reactor Coolant Systen Coc1down Rate. u rence 1 ;..u ~- this occurrence and associated corrective actionThe . -.,} -;.@h 3 n{ q.; M ' d to ~~ L.-f :.. N U. L ,j As atsted in AD-167/75-7 when reactor power level had decr course of a routine maintenance shutdown, a minor systes transient eased in the .M. LC ' 1 '.9 occurred, which resulted in the opening of the power-cperated reli f valve 3RC-66. 3_ Prior to the syste= transient. ~[ "'.-~ 9 reduced fros IDC* TP to 15: e reacter power uss being 4 Contrel systes. TP in an orderly manner by the Integrated gj... sS and power generation was'115 rse.When 15: TP was reached, unit load de .a L - ,.L..., . d demand and pouer generation existed be:ause the reactor wThis differe $ 3;'~ at further follow unit acad de 4 sd.its low limit of 15: TT w 4 as operating Q N",,,, g the turbine control station in sanual. leaving the ICStteanwhile the con r' traching" mode. in the "20ad ~4 match the generated negawatt output."his led to a rapid increase in uni -i 3 n e h the meantime, the sain stems bypass va2ves opened; and whee the main stemt pressure decr valves closed. rapid change in unit load de=and and stcan press eased, the .N

5 feedwater flow and atwas generator level oscillsted d

Rasetor Coclant Syste= te=perature and pressure transient ...,t , resulting in the '?y -4 The power cperated relief valve. 3RC-66. opened when ROS pr i reached 2235 psi but failed te close when the pressure dropped bel .] essure wp' e.j 2:20 pai, although the open/ closed lights in the control ro ow indicate that the valve.was open. m ]' om did not the reactor tripped on low pressure. and the HPI systConsequently. E.*. .'h

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Pase 2 , l'._e j Assust 8.1975 j .1 n I? '~.M s Although the operator closed the isolation valve. 3R:-4. hdiately ~ J - ~7 ~5'

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. af ter the reacter trip to terminate the depressurization the valve sess reopened because of the rapidly rising pressurizer level. . k.. s.t -J~$ ' f' - * ^f was fir. ally closed whar 10 pressure reached 600 psi. terminating ths Talve 3t:-4 .g pressure transient. Coolant Systes, vnen conhtned w".th the te=perature crop d ...E L. .d

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transient, resulted in a cocidawn of 101*T during the first hour wbse + . ' *:W W.. Specification 3.1.2.3.tesecrature was below 530*T. conttary to the previsions -C t f,'l'~1 f..* M~. ' Q.,o gprem ,.,p.. The transient and associated events also ThW-Q.^**.'*i *' 4A caused the quench tank rupture disc to blow open. F.irror to be separated from the bottos acatle of the pressurizer, and the insulatise h:'W - Ju F ..'is release of appteximately 1500 gallons of reactor coclast to the Raacter - - k M[ .N Building sump. f.: y.. y ;... '.. . W. % ~Q e, -(7;., 7 . ',']pf ' ld .J. ij The release of reactor coolar.t did not cause acy significant increase talensed into the enviroment.of radiation level in the Reactor building C 4 s'; ., :.g ... -; p,.t.;r..- - g ~ ?.. j ,..;g-As addressed in AO-287DS-7. the excessive cocidown rate a gh, y_ _. .N the transient has been evaluated and it was deterzined that the h u.y~. y '-. q and safety of the pubde'was not aff e:ted. ealth 2; exceeded. No other systes limits were

h. ~3..? #

-.l ..e t sia 19 9 '. ?.W.; y,h ~ The failure of 3R:-66 to close and the malfunctiesing of the valve W,1 '%Ng C ._,-.,y. y position indication in the Control looe have been investigated. .M fM.-s v i p r,7 ~ '1 g' of best expansion, boric atid trvatal buildu; c:has been foun It N v., the valve lever. rubbing of the level against the sciencid brackets, and be ding of [.

y the solenoid spring bracket.

The malfunctioning cf the valve position indication was not observ y I4 when the repaired v,alve was reinstalled. -g74 - '2 .j This stifunctioning was less than the full ci,en position or by the crud buildup ar .c -

as

-dM,%. ?, y1unger operated tierosvitch to the open/ closed lights. t t .g s [ Additionally. to prevent re.urrente of this incident, corrective actions have been c,7 will be taplemented. the fellowing ? 3 1. The unit shutdevn procedures for all oconee units have been revised to include a change that will prevent i decreasing ur.it 1 cad demand 2 below 1201Ne before placing the 105 in the tracking mode. would einizi=e the error between the ut.it load demand and generated ~ This .y power and thus would reduce the possibility of feedwater f1cw and 105 transients. a ..i o 2. n.s The Dnits 1 and 2 power-actuated pressurizer relief valves will be examined as soon as possible for a:y ir.dication of boric acid ~ m. a q.,w... crystal builaup. w iCR.O, ~.e/! s -de.m.- n .s ..Ri ~ CONR9Df$hj Ir s as u Q..*N. *. ' ' ~ PV m'&, p l .2 w ,e' ... ~ n ~. 9.-.=.a k-Vd55 3 3. -s' ..jv - - - ms 4.a.. . -...-ws_,.,-_~.".~~~..ms,,..,,,,.,,.,,. .es .,)* e g.c... u&.up:--s. =1%:.r.O

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k. K rman C. m eeley f,j Page 3 4

A&4ust 8. 1973 + .y 3. g To verify the proper functier.ing of 20-66 a test to cycle R:.46 prior to startup with a test.sigt.a1 corresponding to 2233 psi will f,. O ~ 7.T. f. '.j be it.corporated into the station operating procedures. 4 4 l.]3 The guanch tank rupture disc has beer. replaced, and the bottaa mozzlaa on the pressuriser were dye penetrant tested and the ,e' q E.tror insu*atioc replaced. .s 4,- .:.y .$[d.%. '.d2'.Q 3. Operating personnel have been advised c' this incident'vith specific .. -3 W._ r g.i's.y,.'. instructior.s that 2mmediate closure of 33tc.4 is the proper corrective g _.,v. +. y.%....... d. v._ action for such an occurrenca. W ,:lm (Q.,.,.,.. ; <. 3* .m =.. = Te. tru2y yours, . =c..y. -v f... g. ,a,.n. i. 4..,:..),..9 _W l; ,.. 1 g a ...v. m-w a.. my. . 9-;. .~. w. -j William O. Parker. Jr. V

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-,2 rw,, ?. ..~.: A " - 1, ces Mr. Angalo Cimabusao ~

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Mr. W. E. Cuen Mr. R. E. Tucker i - -.. y Mr. J. E. Saath (15) Mr. C. A. C*. son Mr. J. W. Coz M. j 'tr. M. S. Tuckanaa " ' I, .g Mr. L. lavis (10) Mr. *. 3. Barr 2. ~. 9 Mr. J. C. Barbour Mr.1. D. St.arpe k. I. S. Canady Mr. W..A. Cele, s Mr. D. C. Bolt ~ Mr. P. F Abrahas. n; Mr. M. D. k intosh 1.4.3.3 ..Q;

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'? - W~ m.- 1 a g. n-9.D. t.an 1:t,. ty,un:u.g. y 3 c3 t N J Tete:rene.cE:>C3545n2 ,= s _ a. , W.* .a rr s o.,g;*p~: @- - 3 August 1.1975 j. t..i ~' - - 4*.1 W Mr. K. S. Canady .,.?q. 1 manager. Proje:: coerdina: ion,& ticensias. ~; . q u.cP (. 3 Due Power Cc.:pa=y - c: ' Z r..'. 'q Post D! fire Zoz 2178 " ;-a; @F.* ' *-*.'. . ~..:, i Charlotte, North Carolina- + ..'.*= u; y 7,..., 28242 +-'

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.yL:21.;$;A riQ-J.h subject:. l M b. h i.Y.-.7.~--3 S'l ~ Deonee Nuclear s: sties ? Y n]?"~ '%+ "' $.I-:., ". e ]..; ' Master Servita Task M -.Wf.M '. ~ Dmit =I cooldoen ran: tent i .,s.. har Isa: .sw 77;F.-di,.. 7E+.1,, At Duke's request we base reviewed the data rela d t 1 - E. ' apid coc!down

. ~e en.3une 13,1975.

, '" j; " '5.} \\ follows: Dur review considered two aspects of the transient actor shutdora , as i .E 7 ' --.- 'j A. .,g',ig,g Wolation of the '51mits for r.init=n R* pressure as a *uncties n hg4-3 to maintain fuel in ec=pression (Tigure 1.0-3 2 of ::"> 110101 L '2-erature p' Df..i ~.. Precautions). _( imits and

.g-y " i -

7-. Rased on our analysis of the trans*ent shown in the attached fi .7sfe - ' - ]~~27 advised.w.r. $chnid by st3ecen on June 25. 1975 that en the 1:1tial 0,' gure, we ?;13...j startup fellowing the subject transient. ~J .li';b'4.U; .T' duced from 71 per hour to 3: the e.artup rate should be re-This vill allow additional ti=e feper hour be:ve'en zere and tve::7 percent yover. . damage to the fuca cladding.30 into solution, thereby precludin } m 3. ?ossibic viciation of the Tech. Spec. criteria of a caxis= = te change of 10,*7 per hour. =perature , A review of the da:a leads to the fo21eving simplificatien of -he t ranrient. h Pressure 'Termerstv e fMe: 1.et) Start - 24 hr. 42 ::in. 15 hr. 10 min. 1200 psi Ind !85*F 700 psi 504*r '."1 1he duration was 2E sinu:es and the total temperature chan .' 2 rate of change during this time of 174*T/Er. ge was El T. or a u v 3... b.

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'W E% K. Viibr -0 g;..g =.,,y i kr. K. S. Casady . s. 5 August 1

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Page Two. 1975 ~~ s

5. -

, / 'a ,,,-?q . pt. s T y ~. p. + i Tanctio a1 Spe,:ificatiBy co=parisot the rapid .,..- - 3 .l., [.. :!.,- ca centains the followinde ~~ y. 2 Thrrat!en est defined in 3G*s 1 y.* g. 15 min. Pressere . J c. " ~ . f.'.*J -/M, c 5 results 13 22D3 psi to 800 pst Tes serators ...ft;$ M.Q This 4 r that which ocevered4 210*T/hr. rate

w-

.N'.;.3..J-;'t.3 .~ t classtfied asEe=ce it is esacluded13. 1 co= parable. os June +:63-Q should be sl Since the conditie=a rapid depressuthe Je=eAlso the p;essu:i - 4~4T.1.~* ~ that ..f-5-.s'ff"'M % :1cs trassient.13.19 ' the ASY.', See:1oc 1*: rapid depressurizatieso' the s ar:esca and sisce13.1973 occ M \\ .additic.a1 calculatic=sanalysed conditiess, and urrence v ,q rapid depressuricatie isery c!esely a -f i 1 . The #JWI Secties 2:1 criterianot neces ^ 4f; scalyze a

he it vill still be met.

-tempera teeconters over violatter -.2 was any ~ ' ~,.. l change . cf met "of all includin

1

r fication,g a definitioncf 10C*T/hr. is not athe Technical Spec i

that thisof rapid depressurizatipplicable in this ins . ~K-at.high we ad=it . criteria of a s could lead tete =;eratures can be maximes si=:e the exceeded. on is ance. 37 conditions whe:e IDO*f/h!. isa non-ductile failurco:potests It isour functicsal spect-Q- .'.h ) sirs 3e are w ll aheve the 507:not cf criterics is i=cludpd e. e It is diffies1: or is 5 1m in the Tech. Specnot applicable. thus tto defi e which asc

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der es:s.a.y. the June all suffered so da: age dueeisatice transiest and13, 1975 occ o it can beurre_: should he. simplify. a .;4 ~

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. e,:,d. s. -,,2 more severe that coniitietez:essive 1 2 to strescencluded.hatclassified as a '.C.. --.3 s previously a='s levels because thisthe EOS co=pon rapid ~, alyzed. was no ".} - k 7.espeetfu13y you'ra g TEI 2A3:"0 K & V:2 00I C' 7 '*JAXT / ,, j / , p k., f"," STE/ led S. 7 a ~6 -..~. $ S v/ attach. Pro.je. Me %== i 4 ect R. V. Bestian ct P.anager Tuel Team .n _.a J. E gr r,. 'y.

3. z Smith

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ML20024B256

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