ML19329A881

Forwards Request for Addl Info Re Degraded Grid Voltage Condition & Offsite Power Sys.Response Required by 770204

ML19329A881
Person / Time
Site:	Davis Besse
Issue date:	01/25/1977
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Roe L TOLEDO EDISON CO.
References
NUDOCS 8001150773
Download: ML19329A881 (5)

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DISTRIBUTION g

Docket File JAN 0 5 'ii!!AC PDR Local PDR ELD LWR-1 File IE (3)

DBVassallo ACRS (16)

Cocket 'io. 50-346 FJWilliams bcc: JRBuchanan, NSIC JStolz TBAbernathy, TIC LEngle Toledo Edison Company EHylton ATTH: Mr. Lowell E. Roe RHeineman, SS Vice President, Facilities Dross, SS Developr.cnt JKnight, SS Edison Plaza RTedesco, SS 300 "adison Avenue HDenton, DSE Toledo, Ohio 43652 VAf!oore, DSE RHVollmer, DSE Gentlean:

l1LErnst, DSE WPGammill, DSE Rent'EST FOR ADDITIOf!AL INFOR"ATION FOR OFF-SITE POWFP SYSTET'S (DEG"JOED GRID VOLTAGE CONDITICH) - CAYIS-? ESSE, UNIT 1 The Enclosure to this letter provides additioral recuests for infor-ntion regarding off-site power syster.s. The additional renuests for infomation are being uniformly anolied to all facilities presently under an Operating License review.

On October 1,1976 ve recuested infortration renarding a degraded grid voltage condition for Davis-Besse, Unit 1 (03-1). Your response was provided to us on.ovember 3,1976 and in subsequent submittals on December 21, 1976 and January 4, 1977.

If your crevious resconses regarding these natters adecuately adfress any of the infor-ation as requested in the Enclosure to this letter, we recuest you identify your crevious resoonses in your subnittal to this letter.

'Je request that your resconse be excidited as cuickly as possiSle but not later than Rbrrry 4,1977.

'M recuest that you provide a schedule for submitting the ecuested information within 5 days after receipt of this letter.

Please call us if you have any ouestions regarding these matters.

Sincerely, OW #

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John F. Stel::, Chief Light Water Reactors Eranch Co. 1 e

Division of Prc.iect "anagement b'

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J Farus ABC 318 (Rev.

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Toledo Edison Concany 2.

JAN 2 5 1977 cc:

'4r. Donald H. Hauser, Esc.

The Cleveland Electric Illuninating Coacany 9.0. f?ox 5000 Cleveland, Chio 44101 Cerald Charnoff, Esq.

Shau, Pittnan, Potts and Trowbridge 109 M S tree t,.'t.U.

'd'shington, D.C.

20036 Leslie Henry, Esc.

Tuller, Seney, Fenry and FedDe 300 t'adison ', venue Toledo, Ohia 43604 I.

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Supolerental Ouestions for Of E-si e Power Systans on Davis Besse 1 Based on.,the 3, rid systen stability analysic results, ste.te.

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the nominal valua and the na 1 :.: ani ninit.n.: :pread values

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voltcy.: :arl frequ2ncy of the offsite pmr source that c.?

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assure satisfcctory oparchility of all electrical eqcip=ent of the station d=ing all = odes o? plant ops =tien.

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!!a :=c.cira thst 1 review be perfo=id on tha desi3=. cad...:/.C.-

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installstion'of the stat' ion elect: Ice.I systez.s to pi'ovida

-[ :.. Jc, '..<?i-assuran. ca that all ec.ci =ent.uill.fr.ction csntin.:cusly at.':..i'?

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~F' tha *--*. 2 and nini:n :.alectrical.cha ::acteris:ics duri ;g ' './2' '

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all nedas oE.pinnt opention idantified in the first cuestion. - '

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Provida a li&~,. idecti?/ing ene'h circuit nedfor elect ical.,.

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The result: of such.' f. ~~I

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device that dcas not satisfy the above.

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The nenitzl and tha nazir. :/=inici= values of volt:3e.

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at the sa2:ty := lated buses for offsita pover sys e s v. - :. '.'.. - :..

J volts-o screads delined in first c.uestien.

o The capability of all saf:ty : lated loads, control a=2 ',:" ~

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instru= ant rion ci=uits to perfors their safety function:

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first question.

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Spacific d= sign features incorporated in the plen::

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.sy::te:n, i.c., t:c..sfo=er on load /officad tcp ch2 agers, valt.:g Ic3alators, c::c., to assure that acceptable voltaga 1s are naintatued at the sr.futy rul t:d huscs far all 10, ::

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Provide a description of the procedures used to naintain grid con,.2.gurat..cn and oj:eration an a condit:.on wa2.cy a.,.waya, satisfies the limits identified in Questica 1.

Also, provide :

p the following; bas-on the grid systes stchility analyses,

results:

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A.' - Describe how the ooerator is made aware of the oueration ; -.

of the grid in regard to the limits identified in* Question 1.-

B.

Tne effects of loss of th's n.cclear generating unit en off. f, ', i-sita povar sourca whila operating at tha li=its identified....

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The ef:.ects or loss o: tha largest gr:.d load on or

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power sourcs whila op'erating at the limits identified in.'

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Questien 1.

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Identify cny restrictions placed en the grid ope: ation.

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that res.=.res.spw.2.:.= sp1nnzng rese::e (either reai or reactive pcNer) to be available with.in a dedicated distsace

,from the nuclear statien in order to naintain ene o::s:.te.

pcueE source within the li=its identifed in q=estion h. '

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Describe the specific design provisions included in the plant. -'...

Class 1E power systems, to assure continued operability of.

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safetf equip =ent,.shculd the offsite power system charecycristi=s,,-...

exceed the li=its identified in first questica due to abnor al '

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systen co.:'.icions. Tne response should also specifically include the fc11cving:

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A.

The design basis and criteria for identifying the offsite power system deg adstion and isola:: ion of the plant i

electrical power systens from the offsite power system.

B.

The design bases and criteria of systens used by the control room operator to identify the condition,of all safety

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relatedbuses and other safety related equipment during an... '.

offsita power systes degradation.

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A list identi9 ing those'honitors used by the control room -.. l '... ~J C.

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. ~ operator in (B) above.. This should' also specifically

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include meters, indicator types, alar:a setpoints, ani..

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recorders.1 6

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Provida a descriptien of the method which will be ecployed

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to ver'ify the adequacy of the P ant design befo e reactor operation..

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