ML20090F401
| ML20090F401 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Three Mile Island  |
| 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 * *
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Serial l'o. 391 . . .
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- k. Mr. Re;ional James Director.C. K sppler Region III * -,
Office of Inspec:1on & infor:ests: .
- . . U.S. !*uclear Ec;ula:ory Co:::.issi: *
- 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. . .
In accordance vish 10 CTA Par: 21.21(b), this is s repor: of a defec':*is 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.
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- . '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
.. conditions and preventin; the tu:bine !;os cc in; up :o desi;n speed .
. *%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 ,
8 * 'tuthine. Ir.vesti;::fon hs: thos. tha: vi:h the 3 dise serve:.o:or drivin;
- 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 24 gavernor to bind and :his mis:li;n= n: for:e can be recoved by driving , .
. 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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- 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:'
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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 .
- 4* 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- -
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be completed.during Mode 3' of :he ca::en: s:ar:up. .. .
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'e 1830 - Turbine-senera:o :ake: off the line :o repai; ] 7
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2343.- Pla=: s:able a: 1500 ;sig 7,3 + 523'T . s sept. 25 0415 - 5:arted Pla : Cocide , , 0645 - Co=ple:ed ici:ial se: eey of Co==ai =an:
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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.
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Cet. 6 S:arted Teedva:e C*.aa v; in ;;epara:io: for 7.e c:or
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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:
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