ML20037C854
| ML20037C854 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/07/1981 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20037C853 | List: |
| References | |
| NUDOCS 8103030322 | |
| Download: ML20037C854 (15) | |
Text
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Seaver '!ailey P:wer Stati:n, Unit i.
1 :tetenta-tor.s o.r..e.e::mendations 7:r
.ux,.liary.-ee:wa ar systems I.
int-edue:'en and Sack round The Three '4 iia !sianc Unit 2 (l'i!-2) acciden: and subsecuent investigations and s udies hignlign ed the importance of :ne Auxii'aey Teedwater System (AF.-:S) in.ne mitigation of transients and acciden s.
. s tar: :" cur assessmen: Of
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-aving nuclear steam su: ply sys ams (NIII) :esignet :y Westingne. se (WRE3 051.
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'2) Assessed ne eia:ive relf ab'ii y :# :ne various AF4 sys:ams un:er var'Ous a
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3 nis review will c0nsiderably imprcve t e reliacilf y of the A.ri sys em fur h
.ee..ine, pt.an.
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The folicwing generic rec:mendations did not acply to this plant: GS-1,
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a c:ndi f on imposed by the.:P.0 f
-he Beaver '! alley ?:wer Stati:n Unit ~,
Ocarating License and.eas ne: due :: water hammer pr::lems ex:erier:ec curing operatien. Also, this ::ndition was :: be. recoved when Ouquesne Light Company demonstrated tha secondary side fica instacility.(water hammer) does not result in unacce;;acle c:nsequences. The licensee c.a.a u e s '.a d '."..$ '. '5i s ca.r.#..'.e n '.a.
d.e 'i e.a.d. #r.
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since 'Jni; i has the "J" :::e cdification o One s earc janerator "sec.
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?.ec menda ':n 35 ' - L Ergen:y r:Cadures 'Cr rEnsier*ing 51 er-2.. -...y
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- Ine :ase in wni:h -he rimary water su: ply is not initially avail-able. The procedures f r -his casa sncuid include any operator actions required to pro ect the AFM system pumps against self-damage before water #iew is initiated; and,
- The case in which the primary water supply is being depleted. The crocedure for this case should provice f:r ransfer : the alternate water sources arter o crair.ing of the primary wa er su:cly.
n res:ense o this rec : enda-i:n. r.e l':er.see ine :sted in.1 le::er d
cated :lovember li,1979, tha Or::edures would :e :evei :ec before re urn to power 0; era-icn frc: ne present shu:::wn (Fall,1950).
These or0cedures will inf:r ne :: era or wnen anc in wna: Order ::
transfer to ne alternate s:ca:es of water. The precedures wiii cever teth Of the above :sses: Orica y wa er s urce not avafiacie and primary water source being de:ie:ed. We ::nclude that re :: eaca:icn 35 2 is
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3.
F.e::: enda 'en 35-6 The licensee shoul: ::n'i r?. .:w :a-h avafia:ility of an AFW system ficw train na: has been out Of service to :erform
'ceriodic testing or main anacce as follows:
o
- 3rocedures snculd -de i lerer. ed. :: recuire an 0; era cr :: de er:f r.e
-ha: -he AF'J systen valves are Orc:erly aligned an: a see:nc c: era :r to in:e:en:ently ver fy ra-ne valves are 3r::erly ali;ned.
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The licensee sh:uid :r::cse'Technt:11 S:e:fficati:ns i: assure tha:'
prior :: plant star:u f: ': wing an ex ended c:1d snutdown, as ficw test wculd be performed.:: verify the normel flew path frem the primary AFW system water s:urce :: the steam genera: Ors. The flew test should be c nducted with AFW system vaives in :nef r normat alignment..
In a letter date: November 15, 1979, the If:ensee ::mmt::ed :: medf-fying his crocedures :: recutre an ad:t:f:ral :: era cr :: verify r::er alf;nment f the AFW sys am vaives. The it:ensee 'naicated -he Ort:e-dures wculd be mocified ri:r :: return :: Ocwer ::eration fr m -he
- resentsnu:d:wn(Tait-i!!;l.
Acti-f:nally, _ :ne 11cer.see t.:f:stad that he wculd :r:::se Te:P.nical 5:ecificatt:n- : assure tha pri:r :: ::an: startu: _ feil: wing an extence: ::ic snu::iwr. 1 'I:w tes; wcui: :e :erf:rmed :: verf #y -
- ne n:rmai flew ;a:n fr:r ne :r ary AFW sys e. wa pr s:ur:e :: the d
1 steam genera::es. The l':ensee indicatec ne Tecanfea' S e:ffica:f:ns woule :e sutr.1 :ed ;rf:r : e urn :: ?:wer :: era-ice 'Fa'i 1930T.
- n a Ie: e:-
dated.4ay I*,1980. -he if:ensee ransmi-ed ne :r :cse: Te:nni:ai S:ecift:aticns.
We have reviewed -he If eensee's res:ense and Tecnni:11 5:eef ficati:n Amen:cen-anc c:n:lu:e nat See:mmen:a-f en 35-6 is ace:uate*y e and.
-neref:re, the [f:ersee's res::nse : 15 ~ is,a::ects:ie.
?
h.
5 1
Re::n ecda-fen 15-7 "The if:ensee shcuid verify tha: tel aut::a-ic start AFa* system signals and ass::f ated cir:af try are safety grade.
If this cannot be verified, the AFW system aut::atic initiation system should be modified in the short-term t: meet the functienal require-ments listed belcw. For the longer term, the aut:matic initia:fon signals and cir:uits should be u; graded :: meet safety-grade recuire-ments as indicatec in Recnm=endati:n G'.-5.
(1} The casi;n s5cuid pr: vide f:r the aut: a-f: initia fon of the auxfitary feedwater system flew.
(2) The aut: a:f: int ia:f=n signals and :f r:uits sh:uid he dest;ned s: ina: a single faf;ure wfil not resui: in the 1:ss cf auxiliary feedwatar system func:f =n.
(3) Testability of the initia-i:n signals and :f r:ui s shall be a
- eature of tr.e design.
(1} The initf a-icn st;nais and :f r:uit sh:uid be ::wered fr:m the l
emergency :uses.
(5) Manual capabilf:y :: inf tf ate the auxiliary feedwater systam fr:m the c:n r:1 reem should be 3:ained and sh:uld be f ;1e ented so that a single failure in tha unual :ircuf:s will n:: resuit in the 1:ss Of system fun::1:n.
(i) The altarna:fng current s:::r-defian ;ue:s and valves in the auxiitary feecws:ar systam'sh:uld be inciuced in the au ::ati:
ac va:f n (simui aneous and/ r sequen-f ai) of -he icads :: -he ecer;ency buses.
L
(7) The au: matic initia-f:n signals and :fr:uits shali.be designec so that their fatiure will not resui: in :ne io:s of manual capability to initiate the AFW sys em fr:m the control rocm."
In response to this re::mmenda-icn. the licenses stated in a letter dated Mar:h 25, 1980. that the present AFW aut:matic start signals and
. cci:icnal'y, the licensee a'ssociated circuitry are ::n:rci grace.
- mmitted :c u: grading the au :matic init'a 'en ins rumentation ::
safety grade :y w.anuary.i,. ci.
ice.. :=rses,s res:ense ::,se:: -
endation 35-7 's ac e::a:'t. The 1:ng_:e - : ur. er:ar Of nis rec:mmenca:icn, GL-5, will te reviewed by :ne 's.s r;ments-i:n in:
C:n:rol 5/ stems 3ran:n and a safety evaluatien will be reviced a-a later ca:e.
5.
Ree:mmencatt n - The. :rmally : : sed man'. ally :: era:ec sue:f:n valves
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.g Tecnnical S:ecificati:n : tr::rt: rate nese Or:vistees.
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n:rmally cicsed anually 0; era ad suction valves fr m One river wa:er system would be periodically tes e: and their :esition veri #ied. The
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Or:cecures accid he a:;r:ved nr.: a Techni:a; 5:ecificati n cr::csec.::
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Scecift:a:icns scecify a 31 day :es frecuency for the normally ci:se:
manually coerated suction valves # rem One river weter sys en t: -he AFWS. -In a le::er datec May 1c,1950, the licensee transmittec the procesed Technical Specifica:fcn which included a 31 day test frecuency i
for the nertally closed valves.
We have reviewed the licensee's rescense and Technical 5:ecifica-icn A: enc:ent and concluce -hat :nis rec:::entation is adecuately me. ~here-fer'e, :ne ifcensee's res:ense 's ac:e::':le.
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catac November 15, 1979, na :-Ocedures-for the locking f ne IF'i
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ne :rocacures by the Office of :nspe:-icn and Enfor:ecer.
F.ecommencation
.The lockec bicck valves in each AFW pump discharge o
line a. e aligned s0 tha: the ::::ined f'.cw from One cc :r-: riven :se:
s
- 1us One tr:ine-driven ;uma. 's su ci'ec :3-the steam genera Ors via
- na A.T.4 neacer while ficw fr:m :ne remaining to or-driven :t : 's sdopiied to the steam ;eneraters via :ne redundan AFW hencer. The
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- c== is re uire: : :revent drycut Of :ne 5 e=N ge e-a-
- rs. The If:enset se:uic review -he :resen; alignmen :# ne 1.rf pu D discharge bicek valves and Occify as necessary o provice :ne AFW flew required for normal. ransient, and ac:iden: c:ndi:fons.
In a le::er dated March 25, 1930, the licensee indicated that his
.ves a.tgr.cen for norma,i,
review or the a,_n. system disenarge bicek va.
i r
transient an: ac iten c:ncitions, including ne s#fects of Pign
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s Outage, were c:nsidered in :. e -eview. The a-2:ne: #1;Ur* was
- rovidec witn ne li:ensee's es:ense.
- c:it' nally,
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Stancard Review Plan.ect.:n t..-.J.
We nave reviewed the it:ensee's res:ense an: ::nc U:ec ne ali;n er-
- f the A W sys em cis:narge ::::k va'ves is a::s: acie f r n:r a!,
ransient anc ac:t:en ::nci-1:ns..i: wever, -Pe ::si-i:ns c# ne block valves : ntinues :: be Oncern wr.er. ne ?O::r-criven auxi'iP ry
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...s resen bicek valve a f gnmen-has ne remaining auxiliary fascwa er
- umos; a m.otor driven ?umo anc a turbine : riven cum:1 on a single heacer. We recues: :ne 'icansee.t: evalua a the need f:r a Tecnni:a;
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- icnr and Icw level alarms in -: e con rol reem for the AF.i system primary water su: ply to allcw the Operat:r to an:tcipate -he need to make up water or transfer to an alternate water supply and preven a low ;uma sue:fon pressura ::nci:icn fr:m eccurring. The low level alarm set;oint should allcw a: ".eas: 23 minutes f:r operator action, assuming that the lar;est :1:act y AF.4 :uma is operating.
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(2) Verify tha: the itcve level fr. dica:icns an: alarms are
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of non-Class 1E circuitry and pcwer supolies are at:eptable provided one trafn has a back-up ba :sey source. (3) Verify that the additional low-low level alarm will be redundant and t.se setpoints will aliew a: least 20 minutes for operator acti:n. assumfr.g tha the largest capacity AFW pumo is coera:fng.
r.
a l e +... r.a.., a e. e... _ e r :,
- s. e. e n.... e..... e e. i. n.s e.. s..s.
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.v resen: Beaver Valley demineralf:ed watar s:: rage tank ::ns'sts of two enannels f:r leve! fnct:a icn. Each enannei ::ntains 1 ransmi-e,
centrol r:cm level in icatten and high anc I w level annunciatten.
ne Itcensee, also, indica ec na-bo-h :hannels are su:clied fr:m vitai instrucent bus No. 2 wni:n is backed u: by ba: ary.No. 2.
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alarm system :: :e designed : safe y grace recuirecen s including
- ne use of Class lE. cf reuitry and' aower s.:pites.
t 2.
- ace renda:'on
'he if censes shculd perf:rn a 72 hcur erdurance tes:
.sr.g sys..m.....s e.g.... a
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inciuce camenstrating :na: ne ;um:s remain wi-nin design limits wi:n respec: to bearing efi tem; era ures and vibration and that ;umo reem ambien ncitions (temperature, humidity) do not exceed environmenta!
qualification limits for safe y-related equi; ment in the room.
In res:ense to this rec 0 menca-i:n, tne if censee in a letter dated November 15,1979, in:1:ated that he wcui: :erform the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> pume encurance tes: u;:n c:m:leti:n :f :ne :FW system enange wnf en is sOneduled juring One *resen:.efuelf.ag snu!dOwn.
- ~ 0 l #. ".* *.. s *. *. W a.
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- na: ne licensee's res:ense :: :nis re::mr.enda:icn was ac:er asie
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the AFN *um3 test results 00 Confirm.1at the AF'i$ ;LC;s tra 3C~e*** bit.
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- ee: mencation - The licensee sn:uld im lement the f lio' wing recuire-nents wnich are identical t: ! ec 2.1.7.bf0f NUREG-0 73:
" Safety-grade incication of AF4 flew :: each steam generator should be provided in the control recm. The auxiliary feed-water ficw instrument channels should be ;;wered fr0m the emergency ;cwer diversity recuirements for tne auxiliary feed-
- xiliary. stems ancn sechnica,t sy ar water system se
- or n in n.
P si.:on 1m..
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r.n r s-nns e... u -
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....s Se::em er 30, 13EC, :cr.it ed : u: grace tne AFi systen flow 'ref:a-1:n
- safety-gra:e.
.ne,. s ruren a-,.:n anc. n:rci :ys ars aranen w...
review :nis res:Onse and wii' :-: vide a safe y evalua-fon 1 a ia:er
.a.s..
1
- e::- enca:':n
.i:ansees at n : an s ani:n -scuire 10:31 nanual realignment of vai/es : ::ncu: :eriodic :est: :n one Ari sys em train anc wni:n nave :n:y :ne remaining Ari rai avai'ta ie f r :: era-
-ion, sncuic Orc:csa e:hai:a; 5:ecificati:ns previce -ha a cedicatec indivicual wne is in ::mmuni:a-icns with tne con:rci r:c te stationed a One manual valves. ); n ' ins ruc-icn from -he ::n rol recm, this a
era :r wouldz realign :St valves 19 One 'Fi sys~en rain from ne 6
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- munica: fens be ween the ::r:r:1 rocn and ne auxiliary feec uro room wni:e any normal discharge valve is closed curing surveillance testing."
Ne have reviewed the licensee's response and Technical Specification Amendment and conclude that this recommendation is adecuately met.
Therefore, the licensee's res; nre is.acce::able.
L:ne Tern teccenencatiens 1.
Recernenca-f:n GL The licensee snou'.: ;;;ra:e re AFU sys em au::-.
ca:ic initiation signals anc c'ecuits to et safe y-grade recuire-Tents.
- n res:ense :: this recermanda-i:n, the licensee ::::10:ed in a Ie ter s......... 9:. 9. :20..o a--.=.=.
.9a.,..-W s.y s.am...a u.-..=.. c i. n i..'..=.'. e n a
. - 1.
ine signals and Of r:uits to sa,a:y ; race :y w=nuary
,4
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. = ".. ~.... =...
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initia-1:n s'gnais an: Of r:ui s and orevice a safe y evalua:f on a 1 a
i
....r.....
2.
3.ec =rencation - The l an recu'. res #10w f-m -a:
Ot r-driven :ue:s
~
or one turbine-criven pumo for accident Onditions. This design does I
no: ee: the high energy line treak crf aria in SRP 10.2.9 and 3rancn a
9 i
L _
f T=... a. ', c.= i :. : s '..'..a n i..',,...=..el.v. '..=... =.2 :i..
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- =. '..a... - *.
s ca:abfit:y :: su::iy. e recut-ed AFA ficw : --e steam genert Or(s) assuming a.cipe break anywhere in the AF4 ;um: :ischarge lines c:n.
current.dth a single active failure. 7.ae licensee should : mciete an evaluation assuming such an event and.(1) ce:emine any Ar7 system rr,odificatiens or pr:cedures necessary :: main ain the required M*J flow :: the steam generat:r(s) Or (2) describe h w tr.e plant can be br:ught t: a safe snutd:wn c:ncitien by use :# ::ner avatiable sys ams f liewing suc. a.:cstula a: event.
- 4..r..,..'s to. 4.....s..w..
+.
se...,a.
..s e.ec.....,-
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.v cneck valves were instailec ::wnstream O' :.e : ce Ocerated vahes
". s =. d.
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.a..= e.=.>..
. =. *. =. r.=. a. r. The *...=.aa..
Addt ':nally,
- igure shcws the ic:sti:n Of
.e new :.ect vai tes.
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- a q s i d e r'. - c..=.. =. = k '. a.. s.'..=..
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N. a..ha va. r a.v f =. a e.....=. '. i.. =.e..s =.=. - - =.s a. a c s =. =..
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2.
systen meets :ne nign energy line break critavia in SRP '0.2.g an:
=
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- 3.
Re:Ormendation - Cur investi;a:icn of :he AFW sys em incica es that'tne
~
mot:r-driven auxiliary feedwe ar pumps may nc de environmen ally quali fied. The two motor-driven auxiliary feedwater pumos anc :ne turbine-driven auxiliary feedwater pump are located in the AFW pump recm and the steam su: ply lines to the turbine of the turbine-driven puma are 00ntinuously under main stean ' pressure. A break in the steam line su:plyin the turtine-driven pumo could resul; in a steam environment in the AFW pum:
racm which would disa:le all three auxiliary feedwa er pum:s.
in order : cre eeiy assess the c:ndit,. n of ne
.,,ra.
s tne licensee is recuested o cr: vide. emeera ure anc :ressure Or: files f:r the AFW puma recm 'or c:ncitions whf en-wcuid result from a line
'reak in the steam lir.e feeding the tur:ine-criven ;umo. The if:ensee
's, aise, escueste :: Orovide 013f cg diag?ams and lay-cut-crawings shewing all ofping and Orctactive barriers in the AFW :un: recs.
- . Ta::.7 en:1-i: 'Eas's #:r aux'*fa-v ree:ua a i-em 7 :a :ec.;f-e e- : -
as a ress'.: : recen: staf' reviews :f c art:deg ::an -uxiliary ree:wa s*
sys 3ms v,.-.,.rns,,
ne - a.
conc:uded tna-tne cesi;n bases ar.d riteria z.
Or v'de: 3y if:ensees #0c es abitshi g AFWS recui e en s f:e ei w ::
- na steam generator (s) to assure adecuate removal Of reac Or cecay heat are not weil deffned or documented.
We recuired tha- -he licensee provice AFWS ficw desi;n :ases information s
as a::i':a:la :: the design :as:s ransients an at:iden: ::nci:ier.s 'er
- ne 3eaver '!ailey ::an,
e 9
4 e
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y mc..+
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..a recommendatien. These res;cnses showed that suf'f:f ect 2FI! ficw :: aid be delivered oy tne AFW system cesign c meet the minimum heat rem.cvai requirements folicwing any design basis transien er ascident anc assuming one wors: case' single active failure. The licensee indicated in. order fo" the AFW system to meet the minimum f*cw requirements for tne Feecline.;up ure and tne maximum flow recuire ants 'or the 4ain Steam Line 3reak Inside C:ntainment, acerator inte-vention iscia:e '
th.e treak wi-nin 10 minutes is recuired.
We have reviewee :ne licensee's res:cnse anc re resui s of Oneic ana:<sss wnich snew :.9at the -inimum flew can :e. met by :r.e 550 ;cm m: :r dr'ven
?ume. Mcwever, i-is Our :csition that the 1. l system mee: '::w eccire-E en s ai ncu ccera cr in:arvention f:.r :0 minutes. The ifcensee shcuic confirm that -he Beaver " alley AFW system can pr: vide recuirec flew f:r.
-he ~eecline Ruc ure ar.d 'or ne 'ain 5:aan.ine 5ces?. *nsice :nta'-me -
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