ML17174A440

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Discusses BWR Automatic Depressurization Sys Operability Requirements for Facilities.Automatic Depressurization Sys Must Meet Seismic Category I Requirements.Electromatic Valves Would Survive Earthquake
ML17174A440
Person / Time
Site: Dresden, Quad Cities  Constellation icon.png
Issue date: 01/30/1980
From: Jordan E, Tedesco R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE), Office of Nuclear Reactor Regulation
To: Harold Denton, Stello V
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE), Office of Nuclear Reactor Regulation
References
NUDOCS 8002130615
Download: ML17174A440 (4)
v • d • e


Text

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  • -.i'MUARY

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3 0 1980

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.~1EMORANDUM f OR:. Haro l<i R. Denton, Di rectQr Office of Nuclear.Reactor *Regulation < ::

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":THRU:.. *..,_ _*..

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  • .- V.ictor Stello,. Jr., Di.rector.... '.

"<of.f1ce*>of. In~pectlon. and :Enforcement*_.'... ;

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Darrell G. Eisenhut, Acting Director.

.. Di.vi s1 on, of Operat1 ng :Reactors. '. *

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N*~rman Mo~eley, otrectQr*.

.. ~-'* D_h~s1.on; of Reactor Operatfons Ipspe,~t-ion...

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SUBJECT*:*.

Background

.. Robert*L *. *Tedesco, Ac.ting *o.eputy Director. * ;..

Divisio,n of_.Ope.ratfog*Reac.tors.:*'".. !.:

--~~iard.Jc$rdan,* *Ass1 stapt: 01 rector,for_.

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      • Technical Programs *

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  • Dtvi sion *of Reactor Operations 'lnspect1on -... -*<'.** -.-'*<:::: :*

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. *.. :.. :B~4R"A~TOMATIC ~-0EiRESSU~IZAT~

0 0N *.i~~TE~ -~~~R~:t~:ITY-.:-:*~~, --~/-*_:.\\' :, '.*>,.<'>_ -~* :~:-.,.-.

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  • REQUIREMENTS APPLICABILITY. TO. DRESDE:N 2 AND. 3.
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., "AND QUAD CITIES. LA~D 2 *.~

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.Qh Jar)uar/-.1.0>1*980,*NRCwa~ noffried thatp.~ach Bottom'U.nit2.was shutti~g

. : ~**,.. :_ * *dowri-because -~hey had concluded that.. :they might not have an. operable ADS

,.. :* *-_. -,assuirifnga seismicev_e*nt.-* The conclu~ion was* based on the.'.h1gh leakage*.rate-.*
.,._* ".*nieasured.-during tests on-the.ADS air~supply syst.erriatid the fact.that the air..

supply and.its piping up to_the'ch~ckvalve was.n(>t*s~ismi.cally qualified.' '_. '-~

ln an effort to detennine the deg~~*towh1_ch this problem*"!as generic.

to other.B WRs, PMs. were re*qu.es ted to".~a 1l their l1 cerisees *<' Subsequent.

to these*calh it.was decided. to. issue an l&E Bulletin. to~au. licensees---

with.pl1eumat1clly op*~rate_d ADS, (I&~* Bulletin sq..;01 tsst.ie~ 01/l~l~O).~ * *"...

. On January_ J1, 19ao, Commonwe~lth* Edi son Company (CECoh** the-_ l~ctmse~ t'or":.

the Dresden and Quad.Cities units, concluded that one of the five A[)S *v~lve.s.

  • reqi~ire(l an ai.r supply to operate. *Since this air ~upply (p1p1ng, check.

valves-, and accumulator) \\1as not.seismicall.Y QMalified1 this ADS.'valve. wa~. *.-.. :*

declared *inoper~ble *. *under such a condition the Techn1ca1*specif1'cat1ons":

would have. placed a u7 day" Limiting Condition for Operation *. :Subsequent "..

action on*this matter is discussed below.

The other four valves in the.

.. -Ao*s are electro~tic (EM)' type.. manufactured by. Dresser.

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Harold R~ Denton Vi.ctor Stello, Jr.*

- 2 JANUARY 3 0 100{J From a-systems.viewpoint, the Dresden Units 2 and 3 rely upon an isolation condenser_ and HPCIS for safe. shutdown capability for an earthquak~. Thus re:liance on ADS for this event. (\\*dthout LOCA) is net required.

As stated previously, ADS is-a *part of the ECCS.and works fo conjunction with the low

_pres~ure co~ling systems;*(;.e'., core ~p_ray.a*nd low pressure,injection).

On the other hand, Quad c i tJes l ana 2 do not'"" have an i.so 1 ati on condenser~ 'and therefore hav~ only_-a HPCIS for shutdown assuming a seismic* event~ Thus.the issue of seismic requirements for ADS-is more significant for Quad Cit.ies to ensure s*ingie failure protection.,:-

Discussion Su~sequent discussions with CECo (the licensee) re~ealed that the origi.nal.

, design basis.for: the ADS did not requ1r~ seismic qualification because. a.

s.eismic event *concurrent with a LOCA was not-postu.lated.

  • Therefore, CECo beli-eved*th*at. the ADS wou-ld meet the original design basis and was not.

required to be seismically qualified.

This includes the four electromatic

. and one* Target Rock relief valves\\used in the ADS.

The NRC (DOR and I&E.),

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, advised the licensee that *we could not agree that the ADS.is not required

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to.be* seismically qualified since it is part of the ECCS wh1ch_is required*-._\\

to be sei srni ca lly qua 1 ifi ea. It was agreed that for the near term that we

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- ~wu l d concentrate art the safety aspects and not to resolve these issues

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as ~a-wording and inten't..i_n the*FSAR.

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  • cECo p'rovided a letter to the staff on Jaf}uary 24, 1980, requesting relief.')\\

on the basis of seismic adequacy and ECCS evaluation.

We agreed to consider:\\

an emergency Technical Specification change that would allow continued *

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operation. with four electromatic valve~ opel'.'able in the AUS.until CJl/31/80

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provided that this could be supported by appropriate ECCS analysis.

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For continued opera ti on aft~r 01 /31 /80 -we required furt_her confi rma:tory

  • analyses that would demonstrate.electromatic valve operabil'ity following a sei-smic event.

I&E believes that the EM. valves w~re* acceptable,. NRR-

took their position on the basis of the CEC6 analysis for seismic and ECCS aspects.

. T.he Engineering B*ranch, DOR, discusse*d the_ question of ope_rability of-the ADS electromatic relief valves in a conference call with CEco* and Ge.neral Ele.ctric on January 24*, 1980*.

CEto stated that no formar documentation could be found demonstrating operability-during an SSE; however, although no'formal documentation could be found demonstrating operability of the valves, -these valYes have funttioned during SRV discharge events in the past and the discharge t,ransient forces on the valve are much greater than.

any postulated.ea.r.thquake loadings at the plant sites.

r'&E agrees_ to this.

basi_s.

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  • u.*. aOvsRNMU:NT P~INTtNG ~~*c*' t.,. "I. 100...,...

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Harold R. Denton Victor Stello, Jr.

JANUARY. 3 O

  • 1980.
  • *s1 nee the electromat_1c relief valves *are. relatively rigid elemen_ts ttiat. have_***-.:-.:_-
  • been demonstrated to rema1 n functional *during SRV d1schai"ge. transtt.mts which *.
  • c~use h1gf) :Cb'namic lo~dtng~ on* ~.he valves~ the Eng1ne~ring* Branch has.

concluded that reason~ble "assur~nc~ of.valve operabi ltty can. b,e demonstra~ed by* analysfs and :1nt~r1m operation *i.mttl tt)e *analysis 15* completed ls... -

. warranted.-..'.. :.

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_Staff Requirements.

we plan to contact CECo.. and request'* th~{ folJowing *-1.nforn1~~1'o~ 'and_._act1ons*. *:

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>>:A~',. ECCS Analysis 1.:

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The license~:p,ans* to oper~te**with a -.~reduce.d 11.number *of fully, operable*

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  • ADS valves/:i.e.*,." four~.-valves histead of... fhe that 'a.re bel teve_d.. ~o*. *
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..-meet setsm1c -requirelJie~t~~ ~Th~- analysts.~Pon wh1ch th~ 'plants; were*

  • licensed is *based on Appen~_1x K calculations~ assumif:tg the* operation *, :
  • *.* _*, of five valves *.,CECo has: stated, that/ a LOCA analysts has. -been,_;*.. ~:... ".'...

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  • ** dorie uslng ;four v*a1ves. Consequently the lic.eosee shoutd:prov1de:th~.: *:*-*. -

>.:*,re_sults of*the analysis for :our rev1ew *to_*.'ens\\Jre.*'confo~.nce*:to:

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.. Appendix i< requ1 rements *us1 ng curr:ently :.approved_ ~cc*s m0d~J s* and*.....

.. assuming appropri!lt~

  • si.ngl~.~'fai Jure.s~* *e.g*; -oc** pe>wer *syppJy* *_fa1lure:..
  • resulting;.1.~ fatlur~ of* the H_RCl,.* and* affected low pres~ure* coolfng: -.*

systems, *and that*.these,analyses i°eS,ult in calculated peak.clad... *

-temperatures no~ *in excess.::of "the. 10.CFR 50.46 l1m1~. (2290~F).. ---:-'.. *, *

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'pf-10~\\~ resta~t -~i

  • Q~~cf Cities. un1t*J(and *_at the *~:e.xt pla~ned. shutdown'~:,* -....

... * **of the.. o:ther_* uni ts. *~11~ a1 r acciJmuJ:e:it.ors:- an.cf a.ssoc1 at~d p1p1_ng_ needed * '. * :* "~:.*. -.

to assume Op~ratton: of the: "targei.rock *valve~

11 should t>e niodi'f1ed to :'.*

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.... meet. S~tsmic.qa~sbeing satisfactory, O~esden 2*-.and 3 and.Quad C1t1es*-1 and 2* *should be able to** :-

opera~e-u~t1l the ~u1table doc~mentat1on,1s -prov.1ded. and action~.are. take~, by:_*

  • *. CECo a.nd *the *staff *.~view *is'. completed.... * **

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,*NRR w111: submit a ~etter to CEC~---ad~h1~9. of* ~ur ~q~ire~nts"on*\\h~ vaYves * ". -

and the need *~or. E'CCS

  • anaJy_~i~. whe_re. necessary.

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Rob~rt L*~ Tedesc~*. 'Atiing_.[)ep~ty. Ofrec*t~i ~ -.*.*.*.

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Edward Jordan*, Assistant 01 rector for

  • Technfcal. *Programs D 1.v1s1 on** of: Reactor Opera t1 oris; 1nspec;i1 on : *
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_-~.. Qockets "(5* Z 9 *~*:50-254/265).'..
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('JRC FORM 318 (9-76) NRCM 0240

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