ML20125B482

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Discusses Water in Instrument Air Lines at Condensate Polisher Control Panel &Regeneration Skid Resulting in a Loss of Feedwater Condition on 771019
ML20125B482
Person / Time
Site: Crane Constellation icon.png
Issue date: 11/14/1977
From: Brummer J, Ross M
METROPOLITAN EDISON CO.
To: Geoffrey Miller, Seelinger J
METROPOLITAN EDISON CO.
References
TASK-TF, TASK-TMR NUDOCS 7911090555
Download: ML20125B482 (9)
v • d • e


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llATER sill THE INSTR,UI'EjlT AIR Lli:ES AT THE CD:10EilSATE

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POLISHER CONTROL PA?!EL A:!D REGEtlERATI0fl SKID RESULT-ex-s

!!!G lll A LCSS OF FEEDWATER CO?IDITION Ill Ut!!T #2 Oft Location Ti!I fluclear Station sun:c:

Middletown,.PA 17057 OCTOBER 19, 1977 Date tlovember 14, 1977

.To G. P. MILLER

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Plant Condi tions':

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r_ n_.~__L _.._' At 'thYs time of"o'ccur'r'e'nce the 'rea'ctah pl ant wa s i n a[c51'd shutd'ovin c.E.C.E~.

' The ' secondary llant 'h'ad a vacuusland f eedwa ter hea ting es'tV- - ;----

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- ' blished with one condensate pump and feedwater hea ter string in service.

The main turbine was on turning gear.

Surnary of Events:

At the time of the occurrence the Unit !2 50,000 gallon demineralized stater tank was out of service, therefore, in order to regenerate #2 condensate polisher bed, Demineralized ', uter was supplied via Unit il Cemineralized 1later pump to the Unit #2 Demineralized Water pump supply-Since the Unit il ing Demineralized Water to the regeneration skid.

pump was supplying suction to the Unit #2 pump, resulting in an abnormally high suction pressure to the Unit #2 pump the discharge pressure of the The normal pressure Denineralized Water 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 from mix bed polisher #2 to the receiving tank on the regeneration skid, the Auxil-iary Operator noted water running out of the air operated recorders on Shortly thereaf ter the the condensate polisher control panel, ilo. 304.

discharge valves on the condensate polishers closed resul ting in a total Upon detection, the Control Room Operator LOSS OF FEEDWATER condition.

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

iary operator was then notified to manually open CO-V12, after about CO-V12 was opened.

5-10 minutes and assisted by another Auxiliary Operato:

If this woul,d have happened while at power the unit wot ld have been placed in a severe transient condition resulting in an Emergency Feedwater Actua-tion,11ain Steam Relief. to Atmosphere, Turbine Trip and Reactor runback with possible trip.

Af ter discussing the probitm with the operators, Mike Ross and nyself, Doug Weaver was concerned that it was an instrument problem which in-As directed, his people dismantled, inspected, duced this condition.

cleaned, and reassembled all 42 of the diaphram operated air valves on i

the condensate polishing regeneration skid, since these valves would In provide an interface point in the event of a ruptured diaphram.

addition all instrument air lines have been blown down to insure that In almost all of these all moisture has been renoved frcm these lines.

valves via ter was ei ther found or indications tha t wa ter had bccn there Three quarters of the valves had rusty wa ter and rust :ings ware found.

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NOVEMBER 14, 1977

., j G.

R... MILLER J. L. SEELDIGER l

tha t waier, had been there. f ot. 30;ne,.tilag.,.,,,,,,,,,,,,

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Tn"fh ~dia'phrams"indice tings The remaining quarter contained no visible indication, by rust color However, no rup-of the duration of time that the water was present.

tured diaphrams were found in the system.

As a result of above discussed investigation and the tracing.of all

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instrument air lines in the vicinity, no fluid path has been.found e- #

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- / that would explain thi.s occ0rrence. ;.0ne' remote fluid path was recog :-

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C.ni zQ that. being. thia t the 'demineral ize'd Ya ter,'. bicause'citid

' ~ bnormally high pressure, was forced thFough the seriv. ice' 5 ;n.sys' tem

' 90 2_.Mhrough _thfee check valves', t}je ins trumJht;A r drye'r an'd_back, to the El. -...

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. condensate polishing controls', being the' lowest pointlin the system ~

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However, dew point and the most cons,uming point of instrument air.

readings taken periodically af ter this occurrence in the instrument air system indicated that this probably was not the case.

In summary we conclude that the only way left available to try and

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identify how this happened, is to reenact this occurrance in a con-As a result of j

trolled fashion, however, this may not be' desirable.

our findings, we feel that the folicwing should be acted upon to preclude a reoccurrence:

l l

Change / replace the desiccant condition' indicator on the instrument 1.

air dryers.

I Completely realign all air and water controls on the condensate 2.

polishing regeneration system.

Chechout air control loop for valve C-5 to insure proper operation.

3.

Submit proble:a report on C0-V12 as it appears that the dp across the 4.

valve was too high to allow openings.

Install drain trap on control lines on condensate polisher d'ischarge 5.

valves.

Develop a PM program to take dew readings in the instrument air systern as a minimum on a weekly basis, at the instrument air dryer and at 6.

the condensate polishing control panel.

Revise the Operations log to require blowing down the air compres' sors on each mid-shif t and record the amount of water in the Auxiliary 7.

Log any abnormal arr.ounts of moisture, indicating a Operator's Log.

leak.

Revise the Operations log to require bicwing down the instrument air line that feeds the condensate polishing control panel each m.id-shif t 8.

cnd record any abnormal r.oistcre levels in the Auxiliary Opera tor',s Log indicating excessive ccndensation problems.

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G. P. IIILLER

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fiOVEMBER 14, 1977 J.'L.

SEELIllGER 0

9.

Inspect the following check valves.

1.

SA-V350 2.

Two check valves circled on Figure 1.

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