ML20090F401

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Part 21 Rept Re Defective Auxiliary Feed Pump Governor. Initially Reported on 770930.Governor Modified at Woodward Governor Co Facilities
ML20090F401
Person / Time
Site: Davis Besse, Crane  Constellation icon.png
Issue date: 10/11/1977
From: Roe L
TOLEDO EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20077K886 List:
References
REF-PT21-77, TASK-03, TASK-3, TASK-GB B&W-0247, B&W-247, NUDOCS 8307050435
Download: ML20090F401 (4)
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october 11, 1977 Lovet: t. c. R0.2.-

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Serial l'o. 391 i

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  • k. Mr. James C. K sppler Re;ional Director. Region III Office of Inspec:1on & infor:ests:

U.S. !*uclear Ec;ula:ory Co:::.issi:

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  • 799 *Acosevelt Road Clen Ellyn. Illinois 60137 Des.: Mr. Keppler:

This let:e supersedes my let:e; :o you on this subject dated Cc:ober s.

1977.

21.21(b), this is s repor: of a defec':*is In accordance vish 10 CTA Par:

a composent installed in the D: 1.s-nesse :*ucles: ?sver 5:aci:n Uni: No., 1.

%e component favolved l's :he geva:no; on the aur.iliary fact pur ps.

~

'De auxiliary feed pu=ps ve:t su;;11 d,by Syros hekson ? ump Divisten..

De stess drives pump :urbine was su; plied by Terry Corp =racion :o Syron Jackson. Io, turn..the tu:bine ;overnor v:s supplied :o T+:ry Corporation by 1.*oodward Coverno; Co=p =y.

Tb turbine ;overror is iden:ified as a

  • type PC-P!.. which has a servor.otar c= t:o1 =cploying a Lodine Elec:;ic

.~

Co=pany motor.

The def ect involves a potential far the ;overnor'to bind unde: cer :ia d

.. conditions and preventin; the tu:bine !;os cc in; up :o desi;n spee.

  • %e opr sting procedures f or this cruip:en called for th: :overnc; to be placed in the hi;;h spa:4 stop positier. prior to shu: ting deva the

'tuthine. Ir.vesti;::fon hs: thos.

tha: vi:h the 3 dise serve:.o:or drivin; 8

t a;: ins: the hi;h speed stop. a mis:11;n=en: for:e is ap211ed to the T ba:

of the ;overno; linka:e. This misali;.=ca: forcs creates a potentist for the governor to bind n: a speed posi: fos Icss :han desi;n speed upon a.

turbine startup. This e.isalign=:n: farce does not always cause the l

gavernor to bind and :his mis:li;n= n: for:e can be recoved by driving,.

24

. the Eodine servo stor* :vsy !: ors the hi;h speci stop.

i The safc:y ha:ard whicli could be cre::ed is the poten:ial for both auxil-fary feed pumps to fat) to co: up to dest;n speed upon s:artup. Dis.

could result in a substanti:1 loss of aux 1114 y iceduster (Ic. to tha stears ;caerators when such flow was cce,3 ired. This in cu:n er.wid csuse sad si:nificant rese:or coolan sys:cs pressure /tc pcraturc transient..

g-signi!! cunt belling in the reactor cool:nr. systces il subst:stial decay heat were prrscat in the resc:or core.

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  • The evalia:1pr. :-id
  • der.tifics:!an of this def ec:'vas provided to et on
  • S e p : c-t,c 30, 1977 and was 'diseu:seg vi h Mr. T. l'arp :c: of your oggic.

on Septc=5c 30, 1577.

There are two idencie:1 auxiliary feed pumps vi:b the :uthine governors, y

' described above', ins::11.:d in the :: avis.3csce :*ucicar ?c se: Sts:1:n Uni:'

l'o. 1.

The corecc fva ac:ian c: hen was to codify the gove:nor including the rer.ov.a1 of portiens of the pncu:acic speed-settin: = chasis: :s assure that the gove:no vill pro;ctly cspond :o speed dc=and si;;nals. The pnevostic speed-se::i=; : chaniss v:s never an inte ::1 par: of the functionin; of the governor, bec:=se tha go serno c ployed serves =:o

\\ control. This modift:a: ion ves acec=;11shed :: the tioeduard coveras:

  • 'Cperany facill
    tes. Subseque.: c'es:in; :: :hese facili:ics has preved the prope:. unctiot.i:: of the ga.se::::. Th: :sdifica:1cas vere co pleted.
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prior to the cur:cr.: uni: sca :up. The ;ove:nors have been tested f :

f proper fusetfor.in?,c: auxiliary s:e'a. and :he surveill nce :ss: v11,1-v.

be completed.during Mode 3' of :he ca::en: s:ar:up.

Tours verf truly, s:.~,f a w*

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.f. Sys:e: Ac:ua::en. res 1:1 ; 1: Reac:c ::17, t 7 and Safety Tea:tres Ac:sa:1:= } 2343.- Pla=: s:able a: 1500 ;sig 7,3 + 523'T i sept. 25 0415 - 5:arted Pla : Cocide s 0645 - Co=ple:ed ici:ial se: eey of Co==ai =an: ~ Sept. 26 Clea.nup and s; airs be;.=: Sept. 30 co=ple:ed repai; and :eplact e:.: of =irror insula:ie: on ::o. 2 5:es.: Centra:c Oct. 3' Au:riliary Teed;;=p Cava:.::s re:oved a:d se:: to * %*oodward Ccver:o: Ta:: cry Quench Tank Ru;:ure *:isc repla:cd . Oct. 5 Ye::ed Raac::: Csola.: Sys:e= asd ::: ?.eatter C elas: Ps:=ps to ge: da:a :o evalus:e s:a:us of p :.ps and seals. r Cet. 6 S:arted Teedva:e C*.aa v; in ;;epara:io: for 7.e c:or Coolan: Sys:e= hea:vp 7 1830 - Received ::2C a;;: oval := proceed vi:5 plan: Oct. s:artup .Cet. E 1530 - Checkcu: of Au*ill 7 Tecipu=ps (usi 3 .,1 Aux. ilia:y 5:er.d c =;14:ad . 4 ~* Cet. 11 Arte=pted to :es: p;es:uri:e; ;over relief valve. Unsuccessful due to electrical cir:ut: proble=s. Oct. 12 7:essuriac: power relief velve cen::a1 cir: i: vo: king, s: o.cd valva and it s:vek cpen again WWM. q-&., sof4%.f. WI'..q:'%/*.}.g':r)a)..',.I:*{ e?.f. [:e.?,J **~ TR. ..l, B W i n. n@ $ @ d h $ W J. s.w., x e '. n. R . n. z.,. .- n**$a .w.,.. ....>... u.n... :,.c -...... n. ...c n ....=. u. .w .?.' A**. A 'IA & N. A. l* .'.*.',.D. . 'l ;* ** s:. e., s ;,,P..j; 'Qe v..,.;&.;.,n:.'.

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