ML17174A038

Forwards Request for Addl Info Re Containment Purge Sys & Containment Venting Sys for Continuation of Review of Justification for Unlimited Purging

ML17174A038
Person / Time
Site:	Dresden, Quad Cities
Issue date:	09/07/1979
From:	Ippolito T Office of Nuclear Reactor Regulation
To:	Reed C COMMONWEALTH EDISON CO.
References
NUDOCS 7910020015
Download: ML17174A038 (3)

Text

Docket Nos ~Q-249,

~~d'50-265 Mr. Cordell Reed.

Assistant Vice President Common~e~lth Edison Company Post -Office Box 767 Chicago~ illinois.60690

Dear Mr. Reed:

DISTRIBUTION:

Docket ;,;?'

DZiemann NRC PDR RBevan.

Loca 1, DR SNo.w.i cki ORB#3 Rdg SSheppard NRR Rdg HSmith DEisenhut JRBuchanan.

RVollmer TERA WGammil l.,

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BGrimes X File LShao JMi 11 er JCarter*

OELD.

OI&E* (3).

Tlppolito l

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Biletters dated January 2,.Ju*ly-2, July 5 ano Juiy 30,.1979, you provided **1 information in.responseto our letter of November 29', 1978, concerning

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purgfng and venting fo*r'Dr.esden Units Nos. 2 an9 3 and Quad Cities Units*

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Nos.) and:2.

You~ just.ifi~ation for unlin:iited purging f~ pre.sently.under

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considerati_on.

~*J*e have reviewed your subm.. ittal s and applicable portiors * <<' *'f1 : '*

of the SAR for each facility, and have determined that further infonnati.on.)fi i.s needed.

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l. You have.not addr~sse~ ~ebris which could prevent valve cl~sure, testing A of functional availability of the valves; and, allowable leak rate of the i' I

valves.

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2.

You have not given t~e amount of contain~ent atmosphere released thr6ugh~\\

purge and vent isolation valves during.-the time required for them to r

close-following a LOCA.

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3.

• The design of th~. override/bypass circuit~ of the purge v~lv~s is'*

deficient ~nd modifications are n~cessary.

The infonnation requested is given in.more detail-: in the enclosure to this_

letter. Please provide your respon~e within 60 days after r~ceipt of this 1 etter.

Si~cerely,.

(

Thoma~ A. Ippolito, Chief

-Operating Reactors Branch #3 Encl 6sure:

Division of Operating Reactors 1n1o02 o o *.5

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Mr. Cordell Reed

. Commonwealth Edison Company

. cc:

Mr. D. R. Stichnoth President Iowa-Illinois Gas and Electric Company 206 East* Second Avenue Davenport, Iowa 52801 Mr. John W. Rowe Isham, Lincoln & Beale

• Counselors at Law One First Natio~al Plaza, 42nd Floor*

• Chicago, Illinois 60t03 Mr. Nick Kalivianakas Plant Superintendent Quad Cities Nuclear Power Station

. 22710 - 206th Ave~ue - North

• cordova, Illinois 61242 Anthbny Z. Reisman Natural Resources Defense Council 917 15th St~eet, N. W.

Washington, D. C. 20005 Moline Public Lib~ary 504 - 17th Street Moline, Illinois 61265 Susan N. Seku1er Assistant Attorney General Env1ronmenta1 Control Division*

. 188 W. *Randolph Street

• suite 2315

-chicago, Illinois 60601 Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rura 1 Route #1

!i;orri s, I 1 -l i noi s 60450

-"* S. Uu

~Ear Regulatory Cor:-;1TJission

~os~ Off ce Sox 706

r~is, 1linois 60450 2 -

J EtKLOSURE l e

REQUEST FOR ADDITIOlxAL JtffORt*t!i.TJO:\\ FOR "CONTAINMEllT PURGE SYSTEM Al~D CONTAJ\\~*~ch:T vrn1rns SYSTEM FOR QUAD CITIES STATJDN. Ul\\ITS 1.:.;.;o 2 DOC~ET NOS. 50-254/265

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\\..'ith reccrd to the containment purge end ven*:ir:g system, provide the foll ov.*ing information:

2.

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a.

DiscL'ss the provisions made to ensure thct iscict~cn clve closure wi 11 not be prevented by ciebri s Y.*hi ch co;;l G ptenti c 1 ly becorie.

entrained in the:escaping air and steaiil.

b.

Discuss the provisions made for testing t'ie.:vc'iic.biiity of the isolation function and the leakage rate of the iso1ction valves.

indivtdual ly,.durin,g reactor operation.

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c.

Provide an analysiis'to demonstrate the cccep"cc.biiity of the provisions made to protect structures and safety-rehteC: eq;.;i;::rr;ent, e.g.* fans, filters and ductv,*ork, located beyond the pur~e systei": isolc.tion valves*

against loss of func.ti_on from the em1ircn:rent created by the escaping air and steam.

d.

Specify the allol'l1cble leak rc:tes of the pur9e ar.d ve:.t isolation

. valves for the spectrum of design basis pressures and flows against which the valves must close.

e.

Specify the amount of containment atmosphere released through the purge and vent isolation valves during the time required*for them to close following a LOCA.

During our review of the electrical bypass/override features for the purge isolation valves, circuit design deficiencies have been identified (and made known to you).

Please describe (including appropriate electrical diagrams) the design changes you propose.

Discus~ these changes with regard to the electrical criteria stated in our November 28*,* 1978 letter.