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Site Problem Rept 322 Re Low Pressurizer Level Following Reactor Trip on 741004.Caused by Slow Decay of Trapped Steam Pressure in Turbine Header Resulting in Turbine Bypass Remaining Open Excessively.Supporting Matl Encl
	ML19322A360
Person / Time
Site:	Crane
Issue date:	06/24/1976
From:	Lockard C, Phinney J, Rogers L; BABCOCK & WILCOX CO.
To:	;
References
	TASK-TF, TASK-TMR 322, PROB-760624, NUDOCS 7910040530
	Download: ML19322A360 (43)
	v • d • e

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01R 322 Rev. O pair.ted out the nain reaaan Llat y.vnriacr Icvel r,oes as I 'c., because the trappe.1 stet.:2 prec. are in tuttim* header acccys slowly. i [ { .esulting in turbine bytt as ricainin6 crea for time Ionier than is neccacar:7 I Further exa=ir.ation 'or the reactar trip data revealed that 1:nedistely follow- ' j 1:q the reactor trip the recavater derand actually reduced to 20% inctend of a l relucing to % (eross 2.ir.it vslue as neutron power followin.3 the trip is i k cro). .f This additional feed to stcan 6.ncraters cor.tritates to the excessive cooling -[ of the E0 syrtes c.nd hecec lover prescuri cr level. n . 8 Cee attachM UW report on the subject. p 3.I 4 ~

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VEhDDR m:3 P.O. NO. TASK NO. m GROUP N3. SEQ.fi0. o f Q 3, SITE ENGINEER RE0'O.hESOL.DATE 320'D. CCs?. DATE .= S. P. "A:'n! !9 l TITLE e - a LOW FRELSLSIEER LP/EL FOLIC"I';~ PE.*aTR WIP - " 'g.M DESCRIPTICN OF FRDSLEM t d crr Am:s : surr hSQ S-em?m STATUS - ACitCN TO DATE INCLUDING PERSONS CONTACTED k/k un L. M. Eclo=y of Engineeri.ng infor ed. ,3.y 1*: y y y. 6 v FURTHER ACT!0N RECOM!.' ENDED BY SITE PERSDNNEL gW Reviev and i plement Logic r.cdificc. tion such that rea: tor trh shdd hl,ck .AL --h calibratin.; integral EO 9.12, to achieve a slover ecoldo'.T. r.n e cf EO Sy: ^ !. [iSIl T.es - and a ::cre ceceptable pressurize-level. N This I oble. 'should te reviewed for rJ' c her ls** es. {%ela$= d-d- .qp4@ fSfgiW:f /'- L_ lte/4}k7"('"Ifd Od YM " ^ " l /i488// $-.u',y ' $NITk} pt;Qy 5SQLUTION r pas % sj wpL rn $ IN

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...e o .,,..,m. w My b rernce My PI47 v.f 9/ O fik X__ X I ^ Q' Da 9/h/Th Met. M., fled 1% wi.rt awrc, Act Herbaia stated that '*0n a %$(5', ,,g . edetts Trip t,he ;;ressurfin itivel ue.1/1 not crop as lov as it, dom. n et (tal apprezistaly M laches) " ' ' " ' < s' _ -- .' i . Am1ysis cf ste S/13/74 ccxrst:2r teoaher uAu m +. rip test Perccia the cross Itaits frees aratron pwer errer to Ad u o.3 p72,2n ~ flow cr ntal nid Eet pirfarm na exp :::tet. trater MU r.w e The aciatros ;ms crrce C. 1 *'3.t k COLLt b1Te redwel t,h.* feebr4tet* th*A?.ry! inMdictely c M r f,,%$, w.o,, i i C7045 "d* reretur trip to appemv%scay 5.. The antrea ;o or errer cross li=1t 6 e "Jfsys*t u )- l

ctmil;f rednoe t tha feedr.te::' Elcar demasi to ay;roxiately D:'I r

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rats of coolitd of t.he RC systes ac.t the re %1 text (. rop la presruriur yhm,,7-(([m o r r e 3 wi=1 -q m .- [ a.'a p.o _ - c^ tt j usca The Tea.un for the sa<ive kusic:=irshia performancs is as Ibilows. 3 F Aet.umE Occupatt O t 1 reA::t.ar trip the CnD systen trum. stars to r=1 On a c.e. ntetie r thee the CID is in unaA, ""n"y*ca "s Ch mARA 2 T.h4 P4EtrC3 POVC" err'C 15 CIG11tl to the 7 73 Salitett.lg Inst.frAl._72gst v.aomrersve 73 w a. r. Afe7FI ..e -c v o m nv r a....g, J w m **MsP-oc u,JertarJLditl* etel l_tc.s t_h_a*. i_M_i_nc'h. :as crts pe m g u y,grc e goe p 'y ITCS*4.rc C.AA tac *, hP _ecc,t.t.~n_1_1erl. / 1Y__hettes._JJ,, lt,,$, m,',U,,I,.4Yrve,mc,5 "C"**** f PC ..i a . cc9erwto 3 i,ec.ree nwe s , s'.,

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' rpf.)4 Pleare contact FE=* to see if thr/ vsuld liPe to implecent this ICS i=;reve:ent. - s e . t Q $:;f.._-M - G mA ~ ,e ms APP ~.IES ?3 rJfE Z CONTRACTS: .YES G.-g g y; men a-8 gt;%gl.

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s s q 3, - ::tg# y[ ,n e g j q u i s }l-a, ~.., .2 ,.;[ , #RI 6 G7c sq p ~' 1 J~ h /r. f4)WER GENEkATION GECUP ." d THE 6ASC0Cr & Wit.COI COMPANY a .u O Y a 9 i'/ To l _ :. a' +m ti ' $a .O - ( C. A. Creac7. Project M nagerest I 49 Fres q R. U. Wicks. Control Analysis. EU ISt A Mb- 'E'"'8 Fi1e Ea. i Cu s t. d or Ref. I N - Duka 7:ver Co pesp k b Pate w 'm S 5::bj. A Trrdveter hep fpm" "Kic'ker". Circui: 4 34 for Ocence Unit #1 (and #2 and #3) .wril 15, 1975 j m j q l .m t ? J - The fo11csirF informstien en a redified Feedvater Pu=p Speed Centrol Circuit,. s k which has been ir.plecented at the TMI-1 Plant. As teier. f orwarded at this time to ,j 2(or-3. 3Rracc=acdc this as e tenporary. change to your ICS which will ' p 3 ( ' 411cv incorporatice pricr. to any. additienal load rejection tests sch eduled for - thQ Ucits 1,: S k, jt ga be fc11 cued up by a field change package. 7-y )4 , ' (The purpose cf ths Pump lSyeei"Eteker" Cirtuf t is to enable the feedvater. flov '[,M ~ j . centro 17systes to centinue to,f eliver a high lerel of flow to each Stea:s Geneester,! QN j,

even the:;h the stea:c outlet pressure has suddctly increased approxina.ely 133 psi.

s' 1 The ecdificatica cri inated and impinented at TP.I-1 inproved the averall plant per-f t h forrance by directif increasing feed.ater pu: p speed more rapidly thr.n eculd be ac- . l cesplished by tra ec=bined actica of i.e fcadsr.ater contro'. valve and puzy speed-i l t ccctrc11ers In the ICS. A yg The codifiestien to the present Ecit il ICS is the following: - I i q< Ecute c: edditional vira fr mz the errbine header pressure error g e U signal IIC/B cu Drawing Unt: #1) to two sur::ers which are shces m; j on Drairing D8032313F, The :arricular sue:tcrs are W28.8B('-l-3) t; and IV25.123(6-2-I) and toe nev signal is to be cornected to each d. su ster. In the new line slso install a diode ar.d a 100 k *s resister in a path to greurd. Refer to the attached schenatic. j J J l The turbine leader pressura control error signal has the folloving effective , ranSe: 2 l + 10 Volts = 300 psi above setpoint. ] + 0.5 volts = 15 psi above setpoint. _ j Acy signal belau 0.5 Volts will be blocked by the dicde in the rev line. s 4 ^ I The gain for the turbice header pressure error signal en each st=er vill b nava to be esiculated and set by Duke Power Ccrtpany., The calculation used at . ~ ' ~ r* TMI-1 is given beIce: a N ,O ~} ~ , ~-, ( ~ g F. s

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! r,,, 'wheA suctica pressure la constant. ,y, y', M 1., ise ns pu=p' discharge'preneurc varies 1with' the atuare of pwp deed '- .Q b) : - pe ~ . p-m.N I ~ t.,G 2. For two f eedvarer pun operatio.n find ths.ppp cyaa ! (S Awhen the ' ' s o" M.n ~ * %, 9_Gf & O/ .. pla.t is at 1002 povar. -, ~ ._s, ;e j - ~. = '.2 ] 4, qqQ 3.-. Thi s speed corresper.ds 're a: rtraire.herderjressure of 885 psig;- K'- m ;..c g d -n. _ -

y, d^y

.g,- 1 t cn s % for a turbina. header pressure of:approxiriacciv 1050 pai'thecequired c,e p '~ ~ ; - ( l pump speed voiald'hus to bet * (3 ) - (5 ),r['ioSC i 80..The increase., W.m .... in aa.p speed ;(5 .,Al'ratprerenks ;a fr,a:tica of ths tots 1 rangs cf W;;V;r p L feedcater ptmp speed 1(2700'rpa to 5100 rys et'TKi-D _aud the output ~ gf ' W g 3 15 vo'. rase of.each s.::nier. should.b=Mjusted to causa an-iscrease in ; _^< M:t@.h:ri ij

fee.'ve:er-ptcp speed to -(3 )'14.en the turbine: header pressare ' error ~ ' ~ ~

g, c,ign;41 correspondisg }to;10 pai ~ ccurs. on each.stadr. ,y. j ,,. _. ~ a-4 [ .,,,..n m . w /.m. - < pm e f

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I - - - -. s 2. :*:.- M 2 h '% .. M M G.h,. g% Assume (So):is J.500,rps at;.100!!pcvor,J;'Then.(51) is. 4503 x 1.039. = 4900 rpm y~f:@ " !(. - ' < s d (5; - 55) a '400 rpuSAsstste total.-speed rengo ~ of:feednyer:pu:rps tsM'Nd .2700 tyS400 rpio;or the'? ~otal:,inerbsm;in.l pump;spedfis.2700' rpm. ~.The ga6J ' ' 'M. " (I t ~ {~ & 4,., c each sacser is.that-yhit.h v111:c:ane a.pusp speed'of'4900 rpt whac the -"' - ;y 2 tA+gg%y l error 'u

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- The information conta1ced in this M< dN, E. F. R'an a~ Q/A >A ' V. E. E'.,lson I J. T. Janis ' S' Nc. Il . j ueto has been checked for applicability = Q.%

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r, _ ., _, _ _,,- -...~ -e --~~v m ~ w ~^*~~ '~ ~ - ] 7 w'w /'% m.wr SNh G s n ehw ~U ii ?W140 l en V gr4.g.v. gry s f, l 4 s., ha.p M. N IWLI G: AMJ qw .1 gg Stu.= lines tct. ten the in3tr.::ent connectica: gp'"N Stem wencrnter pressure, for W rbine Feader pressurr. sni ~ I . d'!rk Attached j B-13 which result ei 17, r. re22 or trip.P'.eare fir.1 charts reecried during a ge igfj ~ Fren the.se charts and tatle 1 I drop i.e., SG precrure ic 10 psi higher tir.n ThT,1:=ediately r.ft l:4 Q.g 1 Jpg. with no ;recEure drcp due to flev the Ire:su. rec ewali:ed. Forthenext3.h g.]b@q r.in. sne di pregeure "p e 3 3 eg.% 27. recorded durin, tre fi--. - *Ne nre not pre 3cnt in the THPressure. Alm poto the wave . M[G,4 cor:31 cns sem to be a 6:od irli2stien that the check valves di.i ca se. sese u.g ~.e tact that the Tu-Line Eeider pre: sura re=ains higher for a tire l g hold Yalves have cIcsed)the Turtine 3yp.33 ya vec op.:n lense than necestey. (AFTI'P The Saft j . ad.M.1 i wms 3)#g It is believed that this are g s could be != proved by having the turbine bypass valves cadulate to centrol Etens Generator pcs:,ure when the reactor pi;, gr[pgg g is tripped instead of turbine helder prersre. 'C j Getting these valves closed i so low which veul'1 keep the stes'00Per Lfter s t-ip shoul,1 icep the stee.. generater p f g.),3 generator te=perature higher and th re-j

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n0 ,7 w%c%a re., le. v lves (a'~--v-"-.- ic dw---. '. s ) as e u. s. : on.i to utilite the esercexy g pq frc:ently the :!U limits as specifici by EW call for insediate reduct[:b"' sb' _ l i sA stcan relief cap =-~ Egg veter.dov denand to apprcxi=ste'y 6:5 due to the rice in stenn generater g predrec fron 910 psig to 10 0 psic cn a turbine trip. g[pp Inc cliciratior. o.- l g delay o2 aced'-} er fir whic.h would in *rn terd 13 prevent cverh, the LAL limits l jg j cating the pinary eccl _ i aL-g a. ,o prevent the r.eacter trip-inB 0 01 h RC pretsure, d 6 Han%i% w 1, ? U '4- .>i-W htD M &v,y*i.j 2 *'.*ii.

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_. _.n.--,wm-~~-- - _ _ ;.y m n ~m s s ,y v.- w) 5;- y-1 .: 4. a, v ?.} FAGP 3 i i ~$ Ti.e etttached legit-an5 OcLratic dravint;s refle:t I "" t c surgestcd ny ta utill m L'w r.t:so:pherie relief val"cr to cren fe: eve -; . ?-Id the turbine byre.sc valver, ure evsilable cr n:,t.rur.are at any time, whethe: 'f l, ., s 4 I r'; It tutt be considered t!.at this change vill s.tistanticy ir.ercase the use of t he c t-r; ctnaarherie relief val.ms and ticht irceress.' their :uintera'. e regire-rent.i. g m.. .j v g.; 4 1;?CITO AC7D::: y Contset B&'d to Jee if they muld lite to impicent either cf these sug;ectiens APPLIES 53 CCCt NSS COCRACTS: YES (ITH4 2) m' 4 Jf L 0 .e p4 1 h I .i \\ 'J 8'N#, g 3 3eq - % 3L. g - 7 ' M. - Y L, j.g g a > \\ h ( 7={ '3h 'T a- ~'--'~~# ,.i .w m>- -c t 1 r I 1 I

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8. S.5~oween-Task Engineer 2cAc-ce Terp

k. A.beopes - Project V.anager DATE: 3 -/m -7(,

1 1 g The attached, cleared SPR is submitted for your information. m e 4 E TO. E. L. Logant - FTARIDA ~ R.LO.Ldw<s .L. C. Rogers - MET.ID. R. J. Baker - TOLEDO b N-OUU ? B. L. Day - Incl. Support P. E. Perrone - CFR J. L. Doncell - CFR q j Attached is cae copy of Site Preble=s Report No. Jd s which was processad ( ca Contract 620-60 CI _. Future contracts have been reviewed for the potential of a sir.ilar proble a. This problem is/6e=ewt considered applicable to other contracts d #/V RD'.APJCS: CCI C. M. Jacks - Plant Integration _E o This SPR has been reviewed IAW NPG-1707-01 NUCLEAR SERVId SUPPORT ENGINEER Cma&ud'nua.;d 1 g,c f N i u n m- '*ds

OY Y Y Y b b$NNNbE $??$ $ yay $$[ t ? .s. m., - E:[,c gf es.-21091-2(9-73)[7 ' 'D ~~ BABC0CK & vlLCOX 5 j . SITE PRCSLEM REPORT ~ U3 pia CONTRAt'T NO. 620-0005 SPR W3 322 REV.NO. o CU ger e w P.O. KO. T ASK NO.,2 : GROUP NO. og SEQ.NO.ol WEMCE aco SITE EEGl%i[R REQ'O. RESOL.0AIE REQ'D. C0llP. DATE S. P. FAIE! ilTLE Irs ?mFO.WA: ICE FOLL0*isna GE rmATOR-REAC TOR TRIP I DESC5 tipi!D' OF FROBLEli il Tcllovic4 & Reactor Trip the pressurizer level goes as lov as !+0 inches. 12 Toe 3esnter Trips on high RC pressure: vithin tev seconds,folicving a 1. Gescrator/ Turbine trip at 100% power. 7 ', '. Per c stec'er these situations are unseceptable. See HCo. probloc rem attached. SitiUS - ACTICN TO DATE lhCLUDING PERSONS CONTACTED R. '# 'r t =f Control Ar.alysis armi L. E. Eolony of Engineering are made avsre of the ;rciles. -s

7..

i FUPISEE ACTION REC 0VI:ENDH) Br 2;TE PERSONNEL #1 Issue field change ecre-Isc It:-bine mypass Valves contre signals following the reactor trip should te fic:.'h- 's.

2 Tc review reccc endations in HCo problem re;c-t, specially eliciration or

) rahrs.icn of ETU Limits and IcVering settings on isst two tanks of safe.y M s.1res. -t , n ' ' $ C'@ ' " ' ' 9 f i.Y/x _ ' h[QM ' ' " ' " "' V/h40'

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a ~ifSetunCu o sc_-m q M%x, \\4..%s<. %o 5.0.%.thelw M W-% h S!!j q Eq3 x 4 AFFROVED BY SIGNATURE DATE i S::FFDRI ENGINEERMM{tt DM No.M!he_ Y Z- % ,3 % h N.5 .2 > /g 3 Tiss. EGl%EER /... g[ yne,,. g_ ;L g, t : / Q\\% m wt .NN -k [ W/ '7 /76 ? \\ n s PC!ECT FMt.GER Mb 7/r/74 CC';I CITEGORY O NORM OC 00 0G OL O VEN00R'CL Allt D',$ AUTH CH:RGE 50 l0FIELDCHANGEREO l FC NO. Ln v. SITE CCtFLEll0N REPORT RECOMMENDEO ,q STOS. CHANGE 'M M M[; ig SSE ATTACD:ET2 flNAL DISIRiEUT!fft ' M 5 N;niuct.w A DETiti CNS O NONE O SEE SPR REY NO. s omrmi nr. T 2 01TE C ErtETEr: /// q / 7 c. lSiCNF.D-EY S. ~@. 0^ oot ritr 4 5 S.R. CGNSTR kE? 'AFPROV. @ Q 3 D ATE /)[.// ef/-) /, sTo iN k-j l u

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.) Nay 27, 1975 1 C. RDt-I-10'+ y 8'# .4 ,1 i Mr. J. G. Eerbein Hetropo'.itan riison Cc pany ~ Po: Office Iox L M Hiddlet:vn. FA 170:37 + ,,s

Subject:

Revised STU Limits for 24I-I i Referen:e: RZ4-I-C2, L. C. Rogers to J. G. Eerbein dated May,1565 Y

Dear !tr. Eerbein:

a n, ..'q M*J Zn;ineering has rc ently conpleted v:rk on the revised c rven far ~ t t he ?!'J Linit circul-far "l2!-1 in prept s.tien far pl:nt opern:i:: nai C testing r.ss::intis,1 vith he.nre.p0:ed turbina trip or losd reje::i: tes; at rated power. A :::hrents in:1ude th:s= c.cres nr.1 a. e.p.- :;r;::e 4 ta.,c. c. l '.t 'q A 1 Enalysis of plant opcratic:.21 chara:t eristics during the.*c." y 23, 1975, power runiz:% transien; h23 led to a revision of the curvcc c: pririr.; FI ure 1 (2ttached) shows the r:vice.1 crtes the BTJ Limit circuit. 5 which ccn te inacrpar:.: :a into the ICS at the first oarortunit-. 0:1-r. p.rison /.:'r ti.-

.u-vc cf Fig re 2 which tra currently in use reml:

that the :tel pre.; ure limit is significantly erpar.d-, vc.cra :ha T hat curre is c. re Air.iting : loser tc.perature: snl pc.:r icielr. Tr2 j fcedvate-tenperat re et:rva vis changed to properly represe:.. he effe:: of fecivster tc1pern ure on feed. ter flov and ste:n surerheat. Also, resctor coolant flow h2;. teen changed slip,htly. These revised : r-as are to be utilizei for e.11 plant cperation fron nov on and are net cr.ly associatei with the proposed plant runta 'c tests. The revised I"U Li=it curves cre tested on the B&*J Old Fores: E:1.1 PG sinu 12:ce for s.:veral r tjcr transients and the "l'I-l type pisn -#.th the nev MU

i::its,erfercel very vell. h*nen co m red with th: di et:r.e::, the nee limits prorided greater cr:ra. ins :urgin at n. 1 p:ver.

"he eevelopment of th. re ised carvea was seccy:plic'.c1 by usin; :.2 El.'s 2 certifini ctear. cen.:.ratar canauter Oude ent deterr.inI:; the 11-its f. r th four parr.netera which ec ; ria ? tha AhU Linits to.'w. ca or esinnnin 35 T superheai.. Mter inarrporatin?. the curtec into t.he zi: ulator 1%, the f41:winc operatian d.ran:Icats wer c incorporetul: (s) ra=pind; pr.,ver up and down with both 3 and le lic pumps ep : tina w 1 eN h Nt% . *kD 4 Uh Of [ Yt. d l % 4 M X. R*..ts. *,%WJ =&yh., sy l' r.. n ) V T 15 gp$ kw.. g i g y Yr_sw -' ~ m $"e % %". sp.x ];m. W.,q $[% 5' r %% lT ' ". ek-e?r 3.;f w&y

c.Af%&On W~

an -Wp-e T3 F Q: %R-B L"V - Q.' ~ -W AT efag g k - $4 &[.y 1l&% ra%s3D_W2Aha.1%kf.t 1 .Wr. ~ -* D f 2+ 0 2.M

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L 7, e og g 1 s a n . -:t-5/U/75 rr J. c. :.::-G 9. s (b) tri;.;.ir.g i hC pum;> L T$$ ;ssvar level 4 (c)' trippin; th< turbine at 1003 power level y All cf tMr.c tranab.nts were perfor.3J sue:er:ftu17 wittnt a ri 2c;.or J, trip. In al.ition, tran:1er.t: in which

h2 f t elnter flow rec.i to te lir.ite: wur; perforr.;: nni LL4 control er tLa fcer str:r flov Li t'r.c. :V n?U ~1 lts

'.22 exceller.t. 0;fficient testing of the new UTJ Linit curves i hss cct.rred ard rever op ratio:.:L probl;:.s r.hould develop ct ~:"I-1 [ sin:e the 573 L1=its c.re less restrictive-tr.2n the curves 3.re:e:.tly in [ k .W I g use. n The hecc psr.ying tatic preacnt: the specifi infor:stion which '.efi::ec cach of the four curves in the BTU Limit circuit. 1 Additional ir.for.2 tion with re;;a.rd to lowerir4 the setpsint for press.:rir.<:r 2 electrc=sgnetic relief valve, is included ar.1 has been reviewed cy the i Control iezlysic Group r,f 31tcock & Wilcox. ]~ The effe:t of leve-ing the setpoint, of the pressuri:er

g electrc stic relief valve fros 2255 to 2205 psig hss been analyzei ani vill ficv c.n additioral 56 lbs of stean to M,

t'r.e f;;e:.:h Tank c' ring a very severe transient. y ~. ;au h-cre any furtrer r.:estions, plect.c ::nts.:t r.e. a Ver/ trcly yours, %ddZ OS$ w,,- /-~) gG.3 ,9 ...t.y s s ! l/j'N'h?.) h ..@.o '/ ./ I...e., L. C. Rogets pg' h ez 3 5 e.r. Ir.iineer th ctger jg RM LC? /3f *l;e~- W..? sf wmd J. J. :'clitz %:[.M J. D. Thin::ey r/2fM f:f{ K. F. Sai:2idt

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Eevised ETU Limits for til-1 2:?,*.Iny$'d i p&rw j .C R 1 -- w 1 W t jha+?b ww+ ~ gy# Stea2 Cenerator Pressure

r. g.,4 i

40N4' Pressure psig Feedwater Li=it - T. I gd.,-j 1 w n< Equal to cad less thAs 2003 106 ff3[y Equal to and core then 1125 50 Wha i w y?fN sIJgiQ RC Flow (Tc=perature co pensated - cach loop) 6 I Flow Rate -10 lb/hr Feediater Limit - % a w.s kM*N O .i 0 p??'5 go 120 .ew1:s l ?.s c t .d y%< w,m < e. M'Z5d V .: e tor helet Te +:r ; e (orsc leht neamrsture) N;..f icr.percture, F Feediater Li:.it ~ i its 575 0 Mc.m.;, 60!. 11S p:m/ + st e

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ML19322A360

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