ML20024B609

TMI Startup Problem Rept Re Condensate Sys.Based on Loss of Feedwater Occurrence,Burns & Roe Should Reevaluate Control of COV12

ML20024B609
Person / Time
Site:	Crane
Issue date:	11/17/1977
From:	METROPOLITAN EDISON CO.
To:
References
TASK-06, TASK-10, TASK-6, TASK-GB B&W-0165, B&W-165, PROB-771117-02, NUDOCS 8307110018
Download: ML20024B609 (5)

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Lx:: ion TMI !!uclear Station s e j::: Q Q i L J.31 0 5 tn Middleto.;n, PA 17057 C w. 1s, 19,J.,

Dm r:ovember 14, 1977 To G. P.11!!.LER J. L.'SEEl.:t:GER plant Conditions:

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At this tice of 'cciurrenc~e the ieictorJplant was in a cold shdtdeWn ~ ~

The secondary picr.t had a vacuus and feedwaten heating esta-

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blished with one condensata pump and feedwater heater string in service. The main turbine was on turning gear.

1 Sen ary of Events:

At the time of the occurrence the Unit #2 50,000 gallon deafneralized water tank was out of service, therefore, in order to regenerate #2 cende:: sate polisher bed, Osmineralized Water was supplied via Unit il Cc ineralized h'ater pump to the Unit #2 Decineralized Uater pump su? ply-Since the Unit il ing Oscineralized Neter to the resaneration skid.

purp was supplying suction to the Unit #2 pump, resulting in an abnor= ally high suction pressure to the Unit !2 pump the discharge pressure of the The normal pressure Deninerali:ad !!ater system was greater than igg psi.

of the Unit #2 Gemineralized Water system is < 130 psi.

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During or shortly af ter the attempted transfer of resin from mix had pciisner b2 to the receiving tank on the regeneration skid, the Auxil-r f ary Operator noted water running out of the air operated recorders on Shortly thereafter the the condansate polisher control panel, ilo. 304.

discharge valves on the condensate polishers closed resulting in a total Upon detection, the Control Room Operator 1.055 0F FEECUATER condition.

tr.:ediately tried to open CO-V12, condensate polisher bypass valve; how-The auxil-ever, he was unable to cpen this valve from the control rocm.

icry c;arctor was than notified to canually open CO-V12, after about 5-10 cicutes and assisted by another Auxiliary Cperator CO-V12 was opened.

If this v: auld have happened while at power the unit would have been placed in a so;ere transient condition resulting in an Emergency Feedwater Actua-tien, !!ain Steam f!elief to Atmosphere, Turbine Trip and F.eactor runback with possible trip.

Af ter discussing the probica uith the operators, I!!he Ross and myscif, Osu: Uc:ver ums concerned thtt it was an instrument probica which in-As dirc:ted, his pceple di::antled, inspected, i

ducid this condition.

cleaned, and reassemi: led all C of the ditphra= eperated air valves on c,nde.sete polishing regeneration skid, since thcsc vaives would In th:

prevW an interface point in the event of a ruptu..:d dicph I,

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In cicost all of these all r.:f:t.are has been recaved frca these lines.that wat:r h:-d t con the vi.ms wa.er was either found or indica:lon:

Three qu.:rters of the valves had ru::y w:ter and rus: rinj:

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1 en" the diaphra :s indicating that water had b2en there.for.some time.

The rc cining quarter contained r.o visible indication, by rust colcr 3$

Ilo.s.ver, no rup-

,%Y of the duration of tice that the water was present.

tured-<iicphrc s were found in the system.

As a result of above discussed investigation and the tracing of all instru::ent air lines in the vicinity, no fluid path has baen found that wculd explain,thi.s occurrence. One ra: etc fluid path was recog-ing.thst the 'deninaralized water, because i: was at an

, ni:ed that.bes abnormally high pressure, was forced through the service air _ system, 7.;.,~,'..*

thrcugh three cFack vai.es, the instrument air dryar. and. b2ck to the condensate polishing ccr.trols, bai'ng the icwest point in the. system 1

o and the most consuming.oint of instectent air. However, dew point c

L readings taken periodically after this cccurrence in the instrument air systen indicated that this prota,bly was not the case.

f In su: mary we conclude that the only way left available to try and identify how this happened, is to rdenact this occurrance in a con-trolled fashion, however, this may not be' desirable. As a result of.

our findings, we feel that the fo11 cuing should be acted upon to i

preclude a reoccurrence:

1.

Change / replace the desiccant conditioc. ir.dtcator on the instrument air dryers.

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Cc=pletely realign all air and water controls nn the condensate,-

polishing regeneration system.

Checkout air control loop for valve C-5 to insure preper operation.

3.

4.

Submit problen report on CD-Y12 as it appears that the dp across the valve was tco high to allow openings.

Install drain trap on control ifnes on condensate polisher discharge 5.

valves.

Deveicp a p:4 program to take dew readings in the instrument air system 6.

as a mininu:r. on a weekly basis, at the instru::ent air dryer and at the conder. sate polishing centrel panel.

Revise the Operations icg to require bicwing down the air cczpresscrs l

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on each mid-shif t and record the a.. cunt of water in the Auxiliary Operator's Log. Log any cbnornal amounts of coisture, indicating a i

. leak.

Revise th: Cperations log to requi?: bicwing d:wn the instiusent air 8.

line :),at fords the cendentate polishing control pinel cach'edd-chift end re:ord any abnormal coistu.'e invels in the Au::11tary Operator's Log indicating excessive conder.satica problems.

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IIU'!D'3EE l'~ 1977 G* P*.H* ILLER

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Inspect the folloaing check valves.

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1 1.- SA-Y350 2.

Two check valves circled on Figure 1.

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D. M. Shovlin Shift Supervisor Unit i2 Shift Foremen

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