ML19323F850

General Public Utils Startup Problem Rept.Based on Loss of Feedwater Occurence,Burns & Roe Should re-evaluate Control of COV12.Desirable Change Appears to Be Control in Place of Present Gate Valve

ML19323F850
Person / Time
Site:	Crane
Issue date:	11/17/1977
From:	Brummer J, Toole R METROPOLITAN EDISON CO.
To:
References
TASK-TF, TASK-TMR 2490, PROB-771117-01, NUDOCS 8005290542
Download: ML19323F850 (5)

Text

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P / f ~ s l t f METROPOLITAN EDISON CO M P A N Y s ... c u.. e_., WATER IN TN! INSTRUMEli AI2 LIME 3 AT THE CON:EN! ATE POL!!HER CC:tTECL PANEL Ana RE*ENERAT!0il SXI: RESULT-Laiect trig !!! A LOSS CF FEE UATER C0301 TIC?l Itt Un!T #2 CM Lacuion TMt riuclear Statien CCT03ER 19. 1977 Middle::wn, PA 17C57 Da a Movem:er 12, 1977 To G. P. MILLER I. J. L. SEILInCER plant Conditieet! l At this :fre of oc:urrenca the react:r plant was in a cold stutd:wn mc:e. The sac:ncary plant had a vacuum and fetcwater heating esta-l 311sned with one ::ndensatt pumo and fee: water heater string in servica. The main curstne was on :urning gear. Sura =rv ef Events: At the time of :ne oc:urrence the Unt: #2 50.000 gallon demineralt:ed water tank.as out of service. :teref:re, in order :s regenerate *2 c:ncensata :alisner bed. Osmte.erali:ed Water was su:pliec sia Unit !! Caminerall:ed 'ia:er suma to the Uni d2 minerali:ed Water ;ues su oly-ing Otminerali:sc Water ts tne regeneratten skid. Since the Uni: #1 pu== was su: plying suc fon to :te Uni: #2 ;u::. resulting in an anncreally nign su:: :n :ressure :o :ne Uni: #Z :c=m :ne discharge pressure of ta o 1 Deminerali:ed U4:ar syst m was grettar inan 150 :si. The normal ;ressure of e Unt: 72 Geminersil: d Watar systam is 1,120 asi. Curing or ster:ly after :Me at:arstad transfer of resin fr:s mix ted polisner s2 to :na receiving tanc :n :ne regenera: ten skid the Auxil-iary C: erst:r notad wa: e running cut of :te air coers:st rec:rcers on

ne c:ncensata :olisher ::ntrol canel. No. 202 Shortly :nereaf ter the disenarse valves en :ne c:n=ensata :olf sners closed resulting in a to:21 LCI3 CF FEE:'.IATER condition. U:en cetsc:1cn the Ccatrol Rc:m 0:erster ictediately tried to c:en 03-V12, c:ncensa:e ;sif sher tysass valves how-ever, he was unable :o caen :nis valve frem tae c:nt el roca. The auxil-iary ccert r was :nen notified is manually ::en C3-VI. sfter abcut 5-10 minu:ss and assisted by anotner Auxtliary C;ers::r CO-V!: was c:ened.

If this would have happened wnile at : ewer the unt: would have teen 214ced in a severe tr:nsient conci:1cn resuittnq in an E:ergercy Feedwater Ac:ua-tion. "ain. Stats Neif ef :o A os:ters. Tur:ine Trip and Reac::r runtact with ;cssible trip. ftar discussing tne ;rooten with the c erst:rs. Mike Ross and myself. 6 Coug Weaver was c:ncerned tnat it was an instrucent pre:lem wnica in-g duced :his c:nditten. As direc:td. nis : ecole dis =antled, ins:ected. cleaned, and reassemoled all 42 of the dia:nram coereted air valves on l the ::ncensate ;olishing regeneratica skid, since thesa valves wculd I provida an interface point in the event of a ructured diachram. In l additten all instrument atr lines have been bicwn 4cwn to insure that all toisture has teen removed frem these lines. In at:cs: all of Enese valves water was either found or indica:icas :nat water had teen there g were fcund. Thrte quartars of the valves nad rusty water and rust rings [ l l k 6NTER-OFFICE *.ttMORANOU.'.t i 6 l i l' .l ---v-

e ...l.. -o 9 p ', Z ... ? I G. P. It!LLER J. L. SEELINGE.1 - fl07 EMBER 14, 1977 f f on the diachrams indicating that water had teen there for sone time. ~ The remaining quarter c:ntained no visible indication. by rust calce of the duration of time that the water was present. Mcwever, no rup-tured dia;nrams were found in the systam. 5 As a result of ateve discussed investiga:f =n and the trscing of all [ air lines in the vicinity, no fluid cata has been f und instrt=en that would explain P.is :::urrence. One remo:e fluid patn was rec:;- e I ni:ed that being :na: :ne deminerali:e1 -ater, because it was at an abncrmslly sign ;ressure, was forced nr ugh the service air systts. i through tarte check valves. One instr==ent air dryer and tack to the c:ndensata :clisning c:ntr:Is. : ting ne icwest ;oint in :ne system and ne mos: c:ns ming :otne of instrument air. However, dew ;cint reacings :2kee :ericcically af ar this :c:urrence in :ne ins:rumen: air sys:En indies:a na: :nis ;re:4:17 nas no: the case. In summary we c:ncluda tna: ne Only way left available :s try tnd identify how this hac ened, is to reenac: :nis cc:urrance in a c:n. trolled fasnien, newever, :nis cay not te desira:!e. As a result of eur findings, we feel na :ne folicwing shculd te acted upon to precluce a recc:urrence: 1. Change /replaca the desiccant c:nditien indiest:r en the instru=en: air dryers. .'-) 2. C::slately res11;n all air and water ::ntrols en the c:ndensa:e polisting regeneratica sys:am. 3. Checkout air c:ntrol 1 cop for valve C-5 :s insure are:er cperatien. I 4 Subst: probles recce; on C3-V12 as it a;; ears that the do across ne valve was ::o nign to allow c;enings. 5. Install drain tras :n cen:rei fines en ::ndensate ;olisher cischarge valves. 6. Cavele: a 7M regram to :ske dew readings in the instrument air sys:=m as a minimus on a.eekly basis, a: :ne ins:ru=ent air dryer and at the c ncensata pollsning c:ntrol panel. 7. Revise ne 0:eratiens 10g to recuire blowing down :ne air c:m:ressors cn eacM mid-shif t and rec rd the amount of watsr in the Auxfitary I 8 C: erat:r's L:g. L:q any acncr:a! amcunts of moisture. indicating a

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Revise the 0:eratiens 1cq ts recuire blowing d:wn the instrument Sir t 8. feecs tne c:ncensste ;clishing centrol :anel each S14-shif t line :na: Or's and rec:rd any abnormal noisture levels in :ne Auxiliary C dra: L:g indicating excessive concensacica Or:clems. I

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e-e o ~ a i E. G. P. MILLER J. L. $EELINGER ftCVD5ER 14,1977 9. Ins;ect the following check valves. 1. SA-V260 2. Two enact valves circled en Figure 1. , s//.R, 1 J. A. 3r c er l Inst:. enc !. Centrol Engineer g W_t_n i S N.S. 9,,.s M. J. itoss shif t Su:er siser t. ~ . JAB:sw cc: J. R. Floyd it. J. Marshall g T. E. Morck e I

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