ML19338B853

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Discusses Water in Instrument Air.Related Correspondence Encl
ML19338B853
Person / Time
Site: Crane 
Issue date: 05/16/1978
From: Zewe J
METROPOLITAN EDISON CO.
To: Brummer J
METROPOLITAN EDISON CO.
References
TASK-TF, TASK-TMR NUDOCS 8001200072
Download: ML19338B853 (14)
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- + /2 C' ~. METROf70 LIT AN ED ISO N..:CO M P A N Y s#,.m o.c ,o o.m.m, c.x.. ' I.N ~ ', OAtEL.Ill 'THE 'IdST.R,tjiiE)lT A!R lit!ES AT THE C0t:0Eil5 ATE ~ ' ' ' ~ " ~ " POLISHER C0!! TROL PA!EL A:!D REGEf!ERATIO!! SKID RESULT-I::G It! A LCSS OF FEED'.1ATER C0tIDIT!0ii Ifl Ut!IT !2 Of; Loc: tion Ti11 fluclear Station suhhe: t.liddletown, PA 17057 OCTOBER 19, 1977 Da ?!cvember 14, 1977 ..-i ' To G. P. FIILLER . ~ A ~ J. L. SEELIrlGER ,,.I. m_ ' _..i.h_ :, ' _-:-U_.4.._ . J. -".. i.._ ~ ~~

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~ . II, ~' - ' blished with one condensata pump and feedwater heater string in service. The main turbine was on turning gear. Suc aary of Events: A-the time of the occurrence the Unit !2 50,000 gallen demineralized water tank was out of sarvice, therefore, in order to regenerate !2 condensate polisher bed, Demineralized Uiter was supplied via Unit il Ceminerali:ed Water pump to the Unit 32 D2 mineralized Water pump supply-Since the Unit il ing Demineralized Water to the regeneration skid. pump was supplying suction to the Unit !? pump, resulting in an abnor= ally high suction pressure to the Unit #2 pump the discharge pressure of the The ncr=al pressure Deminerali:ed Mater systam was greater than 190 psi. of the Unit #2 Demineralized Water system is < 130 psi. During or shortly af ter the attempted transfer of resin frca mix bed polisher #2 to the receiving tank cn the regeneratica skid, the Auxil-iary Operator noted water running cut of the air operated recorders on Shortly thereafter the the condensate polisher control panel, ilo. 304. discharge valves on the condensate polishers closed resulting in a total LOSS OF FEEDUATER condition. Upon detection, the Centrol Roca Operator immediately tried to open CO-V12, condensate polisher bypass valve; how-The auxil-ever, he was unable to cpen this valve frem the controi recm. iary cperator was than notified to manually open CO-V12, after about 5-10 minutes and assisted by another Auxiliary Operator CO-V12 was cpened. If this woul,d have happened while at power the unit would have been placed in a severe transient condition resulting in an Emergency Feedwater Actuc-tien, Main Steam Relief. to At csphere, Turbine Trip and Reactor runback with possible trip. After discussing the pechlem with the operators, F.ike Ross and nyself, Coug Weaver was concerned that it was an instrument problam which in-As directed, his people dismantled, inspected, duced this condition. 1 cleaned, and reassembled all 42 of. the diaphram Operated air valves ca the condensate polishing regeneratica skid, since thcse vaives would In j provide an interface point in the aven of a ruptured diaphram. addition all instrument air lines have been bicwn devin to insure that ^ In Olmost all of these all moisture has been re.:ved frca these lines. valves sla:er was eic.her fcund or indications t' rat wa ter had bctn there Three quarters of the valves had rusty water and rust rin.js nace fcund. D**D

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y k. f 8 f:0'! EMBER 14, 1977 G. R..' MILLER 2w J. L. 5EELINGER r had been there. fot..so;ne _tir.ne.,,,2,.,,.,,,,a j ~ *"~" oif'fhh-"d iiphramr 'i nd ira t i ng tha t-wa'ter4 i The remaining quarter contained no visible indication, by rust color ~ ( However, no rup-of the duration of tice that the water was present. tured diaphrams were found in the system., e As a result of above discussed investigition and the tracing.of all _.-- -... instrument, air lines in the vicini ty, no fluid path has been found' .,J..~.L ~~ 1 - f - f{ that would explain.thi.s. oced.rrence. g.0.ne' remote. fluid, path _was.recog- = 3 3 :y d. .the ' cebinera1 ifed.'wa ter,'._because' cit-was" a t. an T.'*.g. :T ' ?. -. _.- " h?ough.the.s er'y. ice.dir.:_,sys tehi,.1T eg_>2,; .E.'.C. - - T.nized that being.tha J...T-jthrough three check vaives, t!r(TinsEumjht"a_ie dryer 5n(back.,'to~the. i r-:; f5 ( F.:..c ' ab,noikai,1y;hich pyessure, was forced t 7 T h tm.. . ~~_- ~ ' ~ - '-. - condensate polishing centiols', being the'icwest' point in t e sys e However, dew point and the cost consumirg point of instrument air. i readings taken periodically af ter this cccurrence in the instrument air system indicated thac this prcbably was not the case. t in summary we conclude that the only way left available to try and identify hcw this happened, is to reenact this occurrance in a cen-As a result of ) trolled fashion, however, this may not be desirable. cur findings, we feel that the follcwing shculd be acted upon to ii preclude a recccurrence: I ChangeIreplace the desiccant condition'ir.dicator on the instrumen* i 1. air dryers. l' Cciapletely realign all air and water centrois on the condensate 2. polishing regeneracion system. Checkout air control icop for valve C-5 to insure proper operaticn. 3. l Submit problem rescrt on CD-V12 as it appears that the dp across the ) 4. valve was tco high to allow openings. Install drain trap on control lines en condensate polisher discharge 5. valves. Develop a pM program to take dew readings in the instrument air systen as a minimum on a weekly basis, at the instrument air dryer and at 6. the condensate polishing centrol panel. Revise the Operations log to require bicwing down the air ccmpressors on each mid-shift and record the amount of water in the Auxiliary 7. Lcg any abnormal accunts of moisture, indicating a Operator's Log. leak. F.evise the Operations icg to require bicwing dcwn the inst'ument air r line that feeds the condensate polishing control panel each'm.id-shif t 8. cnd record any abnce al coistare levels in cha Auxiliary Operater'.s Los indicating excessive ccncensatica problems. g y r er y n - om [ j\\j, a i.N ww o o .e --4.e.mw.. eso m-= .m ge -

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