ML17252A019

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Summary of Meeting with Commonwealth Edison Co., Regarding the Dresden, Unit 3, Feedwater Nozzle and Control Rod Drive Return Line Nozzle Inspection for the Coming Refueling Outage
ML17252A019
Person / Time
Site: Dresden Constellation icon.png
Issue date: 03/24/1978
From: Bevan R
Office of Nuclear Reactor Regulation
To: Lear G
Office of Nuclear Reactor Regulation
References
Download: ML17252A019 (15)
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MEMORANDUM fO.R:*. George i..ear.. ;* c~*1:if~'.,pperad~g 0 Re.~ctorS Branc.h.113; DOR

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SuBJEc.y '*: *.*,. =~~2fT~~~i1:iN~~w~~~~~gNN~~rXNo CONTROL ROD DR'rVE RETURri LINE 'NOZZLE INSP°ECTION.FOR.

  • '.-THE COMING REFUElING OUTAGE~.. ". :. *
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    • 9'0 February_ 28,
  • 1978, * ~*presentat1vfil; of Co-nwealth Edi.son: Company
  • (CECo) met \\dth. the *ijRC *staff to *dis.cuss their :proposed feedwater *and c*ontrol 'rod drive return 1.ine (CRO-jiL).*. nP?.zle .inspectlon,progralll for *
  • the coming '.Pre~den tJntt N(). 3 refue_H.ng outage *. _, A Jis:t.of ~tteµd~es..
  • and.transpa*rencies used* ln the.presentation ar~. enclosed.-..-. * * '.

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.The CECO preseritation include~f a** re~iew.: of. :*thei'r '.f!ecent experience~

with the Dresden Unit 'NO~. z and Quad Cities _;Unit No~ '2 feedwater arid

. cno.. RL ~nozzle inspections~ C\\r;td *a,revi~w-'ot.-th~ir *experience *.using

.. _ 'ul.tra.sopic testing (:UT} prikedures on a. feedwater nozzle.mockup.

he NRC staff
*po~1ti~*:. ~s~--~sta~d *1-ri<r4u~G*-o~t2 ~~ould -~qµi~e *that the.

. feedwater_ a.nd CRP-RL.. noizle. be. dye penetrant tested and WQuJd re*quire the removal. {for. acc*ess. to tht:!. *bore) :Of 'at least one f eedWater sparger

, and the.thermal sleeve* from _th~ CRF-RL nozzle* fn. order to. perform the

  • Pl examination..Jhis' conservative position is.based on experience and *

. infon:nation ava1lable. ~as. of-early 1977..

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CECo proPQsed :that ;~n ~pproprhi.te*progra~*o{ i~~-pectio~* of. th~ f.eedwater.. *~

. nozzles/spar.ger,, w9urd' co_nsi'st of**remate TV inspection of *the 'visible portions* of th.e,* sparger.$*:,and,UT :examination.. of.. the ooz.tles* (blend

.. radius and 'bore),. no;izJe, safe. ends* *and. safe end w~lds~.,*The CRD-R(l*.

nozzle program*.wou_l.d consist of femote* TV inspec.~ion.of the thermal

  • . sleev~., and UT examination of the**nozzle blend radius.;' _nozzle safe ends and. safe end welds,, and the reactor *vessel just belov1 the nozzle.:

. In suppqrt. of.the_i~ **p~op;os.ed -pr6g~a~ -~c~-C~- :dis~~~sed ;thei.r extensive..

'developmet;t work usir)g. th,eir or ins,pec~io'ri techniques. on **a.~riQzz1e mockup and resµ) ts.of the*1r: *recent nozzle..inspections for Dresde~ Unit No.* 2*.

and Quad*Cities-Unit. <<o.* 3.- using. their UT teconiques as p~r-NUREG-0312.

Results Qf*,.these, inspe.c-~ions support their contention tha:t the 7sensiti.vity of *the, UT.'. techni_qu¢ as t~ey use it prdvldes adeq*u.ate. assurance that no

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  • NRC FORM 318' (9-76).'NR<;M' 0240 >'.... * *' ** :*.~:u_:*~, oov~RN~E~T ~~1~T-ING OFF;~E:.~t~;e~ e~e-82..

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. s*1gniffcant fla~ *will.be -undete.cted *.fn :th~.* f.nsp~cted. noziles'. :It

. was argued*-also :that:~. 'tif t~e *case ~of *the. feedwater nozzles....(1) the..

"1nte_rference... fit; spargers 1nsta11ed. fn 19?5* greatly* reduce-. the -..

. poten~ial: for *crapk~ng* and:crac.k propagation and* (2) the refinement of

  • station oparat1on P!:OCe<fures.. has *'gre*atly~reduced_ thennal cycli_ng of the
nozzles. thus*redudllhg the ~riv'.lng force for cracking. in the case Qf the *cRO-RL. ~noztl~,* the therntal **sleeve *,has been *dem0nstrated to. lessen,
  • *the potential. for. nozz.le cracking.and; 1n 'addition-, the. l1 ne has been

. valved *out Of* service SO that* no cold wate*r-passes thru the nozzle.*

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. :. *Al~o discussed. were'.CECo's _plans f'o{removal_-of th~~ nozzle. cladding. **

  • * -..(recomme.nded by the vendor.~.GE,.as.red~c1ng the tendency for.<;racking),

instal.lation of.iiripro'.ved spargers,' *and removal: of~ the thermal sleeve.

from the CRD-RL nozzle-to improve bo}"e inspectability.

  • CECo.stated._
  • their intention t<;)'perfo~*alJ -of the above* during one of.the two*

-Mark I CotJta1nment outa.ges for Ores~en Unit Noi 3. *These will occur

. dur,1ng:*th~ next two refue1,1ngs_, w~1~h *\\'1_111 be Fan.1979 and Spring 1.981.

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After some d1scuss*1on, th.e NRC 'staff concluded~ that*, based.on a

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. consideration of all pert1n*ent fact~rs* and evidence presented by CECo,.

{/ *. ". *the proposed prog*ram was adequate-to assure safe operation f'or the 1'._;

coming operating.cycJe..Final appr-ova1 o.f ttie "program *w{)uld be t;".*
  • contingent *up*on *their* 'providing,; a written description pf *their shor:t.

. term and 1ong *term ~-programs as presented at *the m.eeting;.a.. sa.fety. *.

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evaluation for operatlon.of Un1.t N(). -~ for_ the coming operating *cycle *. *

. and a *commitment to perfonn the follow,ng action:

(1) removal o.f.'the.

thermal sleeve from-the CRD-RL -nozzle.at the *'ne.xt refue,1ng outage scheduled for Fall 197*9, and (2) removal of cla_dding from the feedwater

. nQzzles' and :1nstallat1on of arr improved sparger -design at one of the.

. next two _refueling outages_,.schedul_ed. for*Fall _1979 and Spring 1981.

CEco*agreed to the :c~itments *and Jt was*:*agreed. that.the.:abo've submitta:1s* should be inad~ as soon* a~ poss~bl~. <:.'-

.,..,. ~ orl'ginal signed by

'.* Roby,.'Bevan.-~-Projec*t Mana,ger

.-:... *.. Operating* Reactors Bt'.'anch* #3 Division of Operating. Reactors*

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Enclosures*:

1. List of.Attendees
2. Transparencies DISTRIBUTION:*.

See attached sheet OFFICE~

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SURNAME~

DATE~

. NRC *FORM 318 (9-76) NRCM 0240

. ~f:r U.: fil* ~o~ERNME;NT PRINTING OFFicEs-.. 197&.;.. e2e.6U.

Name J. B. Martin L. DelGeorge E. Potter B. Shelton C. Reed R. Bevan R. E. Johnson G. Cwalina R. Snaider P. O'Conner W. J. Collins W. Hazelton B. Bue kl ey G. Lear J. Reece ENCLOSURE l LIST OF ATTENDEES DRESDEN UNIT NO. 3 FEEDWATER AND CRD-RL NOZZLES INSPECTION MEETING Organization CE Co CE Co CE Co CE Co CE Co NRC NRC NRC NRC NRC NRC NRC NRC NRC NRC

~Co~ N,f'C, //'eETIN' reb~i*hR.y.2 e, 19 78

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UNITED STATES e

NUCLEAR REGULATORY COMMISSION W~SHINGTON. 0. C. 20555 Corrunonwealth Edison Company ATTN:

Mr. C. Reed Assistant Vice President P. 0. Box 767 Chicago, Illinois 60690 Mr. John W. Rowe Isham, Lincoln & Beale Counselors at law One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 Anthony Z. Roisman Natural Resources Defense Council 917 15th Street, N. W.

Washington, D. C.

20005 Morris Public library 604 liberty Street Morris, Illinois 60451

~---*-----~-------------------------------------------~---------------------------------------

~File S-0

  • 02 l\\~

NRC PDR Local* PDR NRR Rdg ORB#3 Rdg L G. Case V. Stello D. Eis.enhut A. Schwencer D. Ziemann G. Lear R. Reid L. Shao R. Baer W. Butler B. Grimes D. Davis Project Manager OELD OI&E (3)

  • S. Sheppard NRC Participants ACRS (16}

T. B. Abernathy J. R. Buchanan D. Thomps"o~

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