ML19220B597

Seismically Qualified Air Regulation Valves Will Not Be Available Before Mode 1 Entry.Mod to Compressed Air Starting Sys Will Provide 10 Starts Per Diesel Generator

ML19220B597
Person / Time
Site:	Crane
Issue date:	03/17/1978
From:	Herbein J Metropolitan Edison Co
To:	Varga S Office of Nuclear Reactor Regulation
References
GQL-0467, GQL-467, NUDOCS 7904270073
Download: ML19220B597 (4)

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~ a - w es-METROPOLII AN EDISON COMPANY PCST CFFICE SCX 542 REAclNG. PENNSYLVANI A 15603

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7 Direetcr cf :iuclear Reacter Eer21stion Attn:

Mr. Steven A. Varga, Chief light ater Reactors Eranch :!c. L U. 3. :Tuclear Regalatory Consissic:

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In acccrdance with cperating license condition D.2, Attachment 2, the cenpressed air starting systen is being =cdified to prcvile 10 starts per diesel generater.

As discussed with ycur staff cn March 6, 1978, seismically qualified air rer;-

latien valves vill not be available prier to entry inte nede 1, as required by the operating license. Instead of the reralating valves (which vould have prc-vided air for at least 10 starts withcut oper tter action), manual safety grade valves will be installed until the regulating valves are qualified.

'n this confirara icn, the diesels vill have air available for at least 5 star s with nc cperator action. 'Inen the nanual valves are Opened, the generator vill have an additional air supply alleving at least 5 core starts.

• ie expect to have the results of seismic qualificati ns cf a prct type reralating valre by April 30, 1978. At this -'-a

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- r21 sting valves vil'. te incorpcrated into the syster.

2.is systen vill then functicn as described in the attached re-vised FSAR pages, which vill be included in a fut"re anendment.

Very trul-ycurs,

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/ Vice President ~reneration u u=..., c., 4 -

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wys Attachments: T:C-2 FSAR pages 9 5-21, 9.5-22 and 9.5-23

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3. M. Grier, Directcr cc:

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L fes additional flexibill:y of the sys:e=, the two redundan: circui:s are in:er-connected so :ha: either of :he two (2) air circuits is capable of starting the diesel engine in :he even: a =ajc c =pecent in cae circui:

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The piping systa= assccia:ed vi:5 :he 5:arting Air Syste= is designed, f abrica:ed, i=spected and erec:ed in accordance with ANSI 331.1.0 Fever Piping, vi:h all c =ponents fabriested f:c= carben s: eel. Seis=ic classi-fica:1:n of the systa= is Class I as discussed in 3.2.1.

C ::: 1 pcver is 123 volts direct curren: f c= :he sca ion ba::ery.

9.3.5.2 System Dese 1onien The S:arti:3 Air Sys:e= is shev sche =atically cc yigure 9.5-6.

The sys:e= circui: for each diesel generator consists of one electric =otor driven air c:=pressc, one dual drive (i.e., elec::1c =c:c: and diesel engine) air ce=pressc, two air reservoirs, and associa:ed piping and cc ::als.

The =aje: systa= cc pones:s are loca:ed ex:ernal ec the diesel Senerator skid and are located in the Diesel Generator Building which is designed to =ae: seis=ic Class I require =en:s.

While che diesel enginn is in the s:and-by =ede, che S: arcing Air Syste= at:

reservoirs are au::=2:1cally =aintained at the pressure of 230 psi by a

driven at: ce= presser. The =ccer driven air c = pressor is pcuered fr:: :he engineered safety features bus and operates en a pressure switch which s:cr:s the =c::: when :he p cssure falls to 223 psi and stops :he motor une: the pressure reaches to 230 psi. T12 two air tanks have the capacity -to effect five starts of ene diesel generater without being racharged. An addi-tic:21 five starts are supplied by three ec=pr-xi air bottles per diesel generater, each with a capacity of 300 scf, =anifolded to the air receiver fill piping. Under nor=al operatien, the ec= pressed air starti=g syste= is aute=stic, consisting of three regulaters ar.d a check mlve devastrees of the reg 21aters. Each regulater vill deliver 100 sef= at 200 psig. When the ec=-

pressers cperate, receiver pressure is abcve 200 psig, thus keeping the check

'-a e ~ aA. Upen ec= pressor failure, receiver pressure dreps belev 200 psig, thus opening the check valve and discharging battle air into the receivers.

The required =ini=u: air pressure for starting the diesel engine is 1C0 psi.

Uhile the diesel engine is in the opera:1=g==de, the secced dual drive air

r :tsser can be driven :s recharge the air reservoirs f::= either c ele::: : =c;c, which is povered f::= the diesel generator electric supply, er 2: independen: diesel engine.

The ele ::ic==::: cpera:es-au:::a:ically on scar:-s::p cpera:ic: the sa=e as :he :::c: driven at: ::= presser, while the diesel engine is s:ar:ed manually and s ::pped au:::s:1:a117 by a pressure svi::h se: at 250 psi.

This back-up fea:ure of the diesal engine drive pr:vidas redundancf ed the systa= in the evan: :ha: all of :ha s:ar:ing air a: :he air raserveirs sh uld be 1:s: as w i. _ is :he ele:::i: power seur:as.

9.5-22

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9 The S:ar:ing Air Sys:e... :uits are equipped vi:h aut:ca. : unl:aders to allow the c pressors :o c:me up :: speed before the c =prasser starts pumping air.

A dcuble check valve in the loadless s tar: line conne::s the line to the air reservoir of highes: pressure. This provides an adequate

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pressure to operate the unl:ader valves in the 1:ad ess s:ar: systen.

S:ar:1. g of a diesel engine genera:cr can be ini:ia:ed =anually in the even:

he autoca:ic control is ':peded.

9.5.5.3 Safe:v Evaluation The quantity of air s: red in the evo air reservoirs associa:ed vi:h each diesel is adequa:e to start cre diesel genera::: uni: ten ti=es.

The starting air systa=s are designed to perfor: both when the associated diesel generater uni: is running and when it is in stand by ode.

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?.c c=, to indica:e sys:en =alfunc: ion and ensure proper systen lineup:

1) Lev starting air pressure alar:s (one in each of the eso redundan:

air supply lines to each diesel genera:ce uni:)

2)

Air shut off valve not fully open alarms (one in each of the two redundant air supply lines to each diesel generator unit)

These alarms are in: ended :o pr==pt operator ac:1on to correct a =alfunction or re-adjust system lineup. The alarn signals, however, vill no: trip the diesel generator unit or prevent it fr : starting when required.

This ensures j

that the failure of a pressure or posi:1on switch in the starting air sys:e=

cannot resul: in i= pair =ent of capability of either diesel generator power supply system to perform its safe:y fune: ion.

The entire starting air systa= is designed to be Class I seismic and to with-stand na: ural phen =ena such as tornado, high vinds and floed wi:hou: loss of capability to perfor= the safety function. This is achieved by containing the en: ire system vi:hin :he Emergency Diesel Generater Suilding and above design flood level.

Each diesel generator uni: has sufficient independence with respect to starting air sys tems.

This ensures cc ple:e redundancy and no i=pairment of capability of :he I ergency Power systes to perfors 1:s saf ety functicn, assu=ing a singla failure.

If ner:al acniliary power is lost to a otar driven air c = pressor, che systen reservoirs can be replenished with air frc= the associated dual drive : mpressor.

?:ver :: drive this cetpressor can be obtained fr:= the electri: Oct:r if the correspending diesel genera:ce uni: is running.

If not, the diesel drive of the dual uni: cocpressor can be anuall/ star:ed :s drive the :: presscr. An energency in:er-connecti:n line is pr:vided to connect tha compresscr discharge headers of the two s:arting air sys:ers in :he unlikely event 'Of al :: presscrs 4..,,

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In addi:ica, a pair of energency inter-connec: ion lines are pro-ride: :: enable a diesel generat:r uni: :: be started with air frc= :he reservoirs W.;

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