ML19270H499

Safety Evaluation Supporting Amend 31 to License DPR-2

ML19270H499
Person / Time
Site:	Dresden
Issue date:	09/29/1979
From:	Office of Nuclear Reactor Regulation
To:
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ML19270H497	List: ML19270H496 ML19270H498 ML19270H499 ML19270H500
References
NUDOCS 7910160352
Download: ML19270H499 (16)

Text

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e. a-NUCLEAR REGULATCRY CCMMISSION i

e usm arcs c c.nsss SAFETY E'!ALUATION BY THE OFFICE CF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 31 TO FACILITY OPERATING LICENSE N0. OPR-2 COMMONWEALTH EDISON CCMPANY ORESCEN UNIT N0. 1 DCCKET NO. 50-10 INTRODUCTION Sy apolication dated November 2,1977,* and supplements thereto dated '4ay 16, 1978, Cune 9,1978, October 19, 1978 and March 7, 1979, Commonwealth Edison Comoany (the licensee) requested changes to the Technical Scecifications accended to Facility Ocerating License No. DPR-2 for the Dresden Nuclear Pcwer Station, Unit No.1 (the facility).

The procosed changes would replace

ne existinc inservice inspection crogram in Section 4.6.F with a program nat meets the recuirements of 10 CFR 50.55a(g).

This inservice insoection orogram is acclicable to the 20-c.cnth period that ccmmenced on March c,1977.

he rumo and valve testing cortion of the licensee's crocosed program will be addressed in a separate action when that ::ortion of the review is ccmolete.

The crocosed inservice inspection program includes request for relief from certain ASME Ccde requirements pursuant to 10 CFR Part 50.55a(g)(6)(i).

Evaluation of those requirements whicn the licensee has determined to be i ;:ractical for implementation at the facility and for wnich the licensee has requested relief are discussed belcw:

I.

C'.A55 1 CCMPONENTS 1.

Relief Recues: 3-1 Relief is recuested from the surface examination of the welcs for oranca pi::e connections wnica are covered wita reinforcing saccles.

(::em 5 c.7, Category 3-)).

Code Recuirement Pice oranch elcs less : nan 5 in. in ciameter snali ce surface examinec (25% eacn inscection interval).

Licensee's Basis for Recuestine Relief 2379

}88 These :ranca pipe connections are c:nstructec ica einforcement saccles.

These sacdles are 'ille:.elcec aver :ne ac.uai trancn :i::e c:nnection

-elc.

A v 1ume r c or sur' ace exa-ination : anne. :e c:ce :n ei ner One

anC.n

nnecti0n ae'c Or One saCcle ae'es.

/i suil e t a~i *ition d'I ' te ncuc *.e

• t'.;r" "g t.n e sy s ' a". 'ycr

• .e s : Or *.?e

• 'ac Sa cle oe'Os.

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Evalua:4:n Because cf tne cesign of tne branen pi:ing enica uses reinforcing sacdles, access :: *nese.eics 1s not poss10:e.

The licensee has committec to perform a visual examination Of ne saccle eics during the system nycrc:ast.

'aith ne cesign of One sys*er., no 0:ner noncestruc*.ive examinations are possible. Using reinforcer.ent saccles in :ne cesign of tne system recuces the stress 1:

P.e ripe connec-tiens.

This recuces the likelihced of failure fr: cverstress or fatigue.

ae 00nclude tnat the materials of construction, the system cesign, and the inspections outlined acove are acequate for rovicing an acceptacle level of safety and assurance that the structural in*egrity of the brancn

nnecticas will not be c:= premised during tnis ins:ection :eriod.

We,

-herefore, concluce that inis relief recuest te grantec.

2.

Relief Recues 3-2 Relief is recuested frem the volumetric examina:icn of ne sucecrt welcs attacning the fins to :ne 01pe on line O.0.,.a /-t,*.

(. em :

.:, uategory

,s

s i,.

• ce Recuirement Integrally weldec external succort attacaments saaii be volumetrically exanined (25% each inspection interval).

Licensee's Basis For Recuestinc Relief The hanger en line 0307-1 is actually several ' ins '-elced :: the cice

.nica ex and Outward in a aall penetration.

These fins ac to ancncr One cipe witnin :ne concrete wall.

An ultrasonic examination of tnese fins to pipe welds would be extremely difficult if not impossicle.

Evaluation Because 0,' :ne design of the ci:e hanger, access to t.9ese welds is limitec Oy One concrete at tr.e penetration anc by ne 5: acing etween the fins.

The licensee has stated tne fin :: pice welcs are 'ille*, ratner than full

enetration. elds.

The licensee nas ::mmittec :: attemc :: perfori a surface examination of

nese welds.

The ositi:n of :ne staff is ina a surface examir.ation is an accepta01e alternative for :he examination of 'ille*,

eles ahere meaningfu ultrasenic ins:cc*.icn cannot ce performed.

i e ::ncluce :na: :ecause f :ne raterials of ::nstru::ics an tne c::cenent Oe s i gn,

• ."e ' ns;eC'.i 0r s Ou".! ' 7ec 3 cve are iceCua te #0 r :r:'. li".g an 1 Ce::a le 'evel of sa'e".) and issurance *.na: One s!'uO*.urs' 'n*.egri".y :#

"nese 00:00901:s *ilI 9c*. :e 0:'":r:mi se cur #"g *.7is 'ns e:*.i0n Oeri:c.

' e *9#:re, *nis "elie# **eCues *. Say Oe ]Pinte:.

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3-3.

Relief Recuest C-1 Relief is requestec from tne vclumetric examinatien of tne icngitucinal and circumferential aelds in :ne core celtline regien.

(Item 31.1, Category 3-A).

Code Receirement Examination of the shell longitudinal and circumferential -elds (10 anc 5% of eacn weld respectively) 7.ay be performed at or near the enc of eacn ins:ection interval.

The lengtn of eld to ce examined snall be increased

at least 5C% of ne leng-h anen the longitucinal anc circumferegtial aeid have received an ex::nsure : neutron fluence in excess of 10" nyt.

Licensee's Basis For Recuestinc Relief The accessibility and inspectacility of the longitucinal and circum-ferential weids will be cetermined after tne enemical cleaning.

At that time, the type of ins;:ec-ion will ce ceterminec anc :regram aill be revised.

Currently, inscec.icn by remote ultrasenics anc/cr accustic emission is being investigatec.

Evaluation 3ecause of the nigh levels of c:n amination, access to the areas recuiring inscectica has been limited and, therefore, tne licensee states tnat degree Of conformance with tne recuirements cannct be determinec at this time.

The licensee stated in the basis for relief :nat the type of inscection will be determined after chemical cleaning t: recuce contami-natten levels.

Also, tne licensee in other.eiecons nas stated that remote ultrasonic inspection is being investigated for these welds.

Based on the limited inspections performed during tne long 0;:erating

eriod because of proclems with accessibility, tne staff believes that Onese welds should be examined to the fullest extent cossible to ascerta'n

neir integrity in accordance witn Section XI of tne ASME 3&PV Code.

The licensee has not demonstrated that tne ::erformance of the required ins::ections are imoractical for the facility with regard to state-cf-tne-art tecnnology in this fielc.

The :: asis which nas been 3rovided 0 cate f0r recuesting relief from the recuirements of Secticn X: is consicered insufficient s nce tne ef#ect of i

cecontamination in e:/'ng 43dinion level s cannc

e ete-rec.

ShCJ c *.he IiCensee ^: :u 9 *.e r aards'i:s in **e Ce'#'

arc?

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3I Cle3ni"C wni"" Crec Jdo *"ei r adhere" i

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?379 190 D**D "D

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_4 fuliy as recuired by Sectica C, accustic emission :es-ing :ur'rg tne vessel hycrostatic test shoulc ce consicere: c su;;ieren: 3e -ica C examinations.

4 Relief Recuest C-2 Relief is recuested from the volumetric examinaticn Of ne longitucinal anc circumferential welcs in the vessel snell and :f ne merici:nal anc

ircumferential bottom heac.eics.

(Item 5 1.2, Categ:ry 5-5).

Coce :ecuiremen.

_.ine exam,inaticns per,.ormed curing eacn inspection interva,i sna,ii :cver at least 10% cf the length of each longitucinal snell eic anc mericional heac weld and 5% of the length of eacn circumferential snell weld and head. eld.

For aelcs on :ne reactor vessel, examinati ns may be performec at er near tne enc Of eacn inspection interval.

Licensee's Basis For Recuestinc Relief The a :essibility anc inspectacility Of :ne longitt inal anc circum-ferential vessel shell welds will :e determined a'ter :ne cnemical cleaning.

At :na time, the type of inspection or alternative means cf ins ection

.111 :e :etermined and tne Or: gram will be revised:

If the special i,spection tecnnicues being c:nsicered for ins:ec-ion of ne :eit'ine regica.eles prove successful, tnese tecnnicues will be a.; emoted on the vessei snel,i welds.

The accessibility and inspectacility of the meridi nal anc circumferential bc tem head welds will be determinec after chemical cleaning.

The accessi-cility of the bottcm head welds is not known at this time cue to the uncertainty of the bot:cm nead insulation configuratien.

Sufficien information :n the insulation is not availa:le.

Evaluation The :csi-ion of the staff fcr :nis relief re uest is basically tne same as :na statec for relief recues: 0-1.

The licensee nas 9c: ce :nstra:ec

na the :erformance of the recuired inscettiens are i::ractical for tre facility after the :nemical c',eaning.

No relief fr:a :ne examinations

an :e grante: at nis.ite :asec :n.re inf:rmati:n :resen ac.

5.

Rei'e' :e:uest :-3 Re!'e' s scuestac ' m :ne /:'; e:ri: examina: ice :'.ne.assel-c ' ange e ' :.

(::em 3'.3

atag:ry 3-0 777Q 101 L- //

l /l

)

j

. C0ce Recuirement The examinations :erformed during eacn ins:ection interval snali cumula-tively cover 10C% of eacn circumferential neld.

Licensee's Basis for Recuestina Relief Inscection of the vessel-te-flange weld can only be performed fr:m the flange surface at this time.

Therefore, cue to st.d cit noles in the flange surf ace, only the areas cetween the stuc nc'.es can :a examinec.

Hcwever, an attemet will :e mace to ins ect tnis weld # rem insice One vessel by remote UT to cover 100% of the weld.

I-2210 recuires ultransonic inspection with a straight beam (C*) and two angle eams (45, 50 ).

Inspection witn a straign: beam (0") cnly from tne flange surf ace provices a more sensitive exam taan angle team inscection frcm tne vessel all.

This is cermitted by tne : revisions f LA-2240.

Evaluation The licensee nas stated that tne longitudinal wave examination (C )

provic~es a more sensitive examination than the examination ecuirec by ne ASME de,Section XI because of the Or:ca:!e crientati:n of discen-tinuities asscciated ith the vessel-00-flance. eld.

Mcwever, the arc;;csec C* examination neither covers 100% of tne weia nce provices an examina-tien onica can identify cssibly unfavorably crientec cisc:ntinuities.

Therefore, the examination pro csed is not scuivalent 0 tnat recuired y tne Coce.

If the examination of the weld is cetermined t ce imoractical, tne licensee shcuid sucmit the detailed tecnnical information f:r reconsidera-tien so that resciution can be reacned ;:rior to tne end of the utage for cnemical cleaning.

The licensee should feel free to conduct the C* examinatien frca the flange surf ace to sucolement ne Code examination in lign: Of the stated confidence for the alternative examination.

No relief can be grantec at this time.

5.

Relief secuest 0-a Relis# is recuestec 'rCm ine V0lume*ric exami a.i:r Of

.s

c'es inc nc: le. vessel ae'es 17.he reac*.Or vessel

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a.j OCe eCu f "e"e N *.

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1. eacn 9:::'e snal' ::ve" 1

.n s.' I ' me ii, L.

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. 0 :e ins:ectec as s.,.cwn in rigure :,n, 4.cu s,.

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.s i. nc::,ies snaia be

,c,e examined curing eacn ins:ection interval.

Licensee's Basis For Recuestinc Relief (1) Reacter Vessel No::les:

12 - 16" Steam Cutlet; a - 10" Instrument; 2 - 10" Unicacers; 1 - 1" ?cison; 5 - 2" Instrument Cue c no::le gecmetry, s ecial UT tecnnicues and crocacures will nave to be ceveicped.

The success Of these exams canect be de armined until ney are attemoted.

If possi:le, alternative exams will be im:lementec anc the crogram revised.

(2) 4 - 22" Recirculation Inlets:

(Inner Radiused Section)

The no::le gecmetry would recuire a mock : calibraticn s andard to provide a meaningful UT exam.

Because tne ac::le is not su: ject to significan thermal cifferentials, the ac::le-:0 vessel weld inscecticns are believed to be adequate to ensure ac::le integrity.

(3) Head Nc::le Welds:

9 - 2" Instrument The no::le configuration coes not previde fcr a meaningful tolumetric exam and tnere is not a no::le-to-vessel.eic A surface exam ' rem botn the insice arc outsice sur' aces will be performed.

(a) 1 - IS" Core Spray No::le:

A surface exam of tne inner radiused section will be per'Ormed in

..ileu of a volumetric exam because if cracks were to form, ney woulc initiate fr0m tne inside surface.

Theref:re, the surface exam is onsicered sucerior to tne volumetric exam (IWA-22:0).

3 valuation (1) The licensee has stated anc the staff concurs that tne gecmetric c:nfigura-icn Of ne ac::les in tne /essei.snell anc 9eac are cif'icult to ins:ect using conventional ultrascnic acnniques anc recadures.

The licensee nas contrac ec 'cr tne cavel:cment :' ecui: ment to era: e inscection of vessei eles anc ;::er nc::les ' :m ne /essel

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. This recuest for relief is, therefore, denied.

(2) The 22" recirculation no::les are located in tne lower portion of the reactor vessel and are not accessible for Cerfo ming volumetric or licuid penetrant examinations from the vessel interior.

Because of the nor:les' geometry, ultrasonic examination of the inner radiused sections would be difficult to perform from the vessel exterior and the results even more difficult to inter: ret without a full scale mock-up of the nor:les.

Examination of the nor:les' welds and heat affected zones will be performed from the exterior surfaces.

Because of the low themal differential at t'e nozzles, they would not be subject to thermal shock and other known conditions which could cause flaw growth.

'eie conclude that the examination of the no::les' welds from the exterior surface, the existing thermal and nydraulic conditions, and *.he conservative vessel design are adequate for providing assurance tnat the structural integrity of the recirculation inlet no::les is maintained and will not be comoremised.

Therefore, relief may be granted from the volumetric examinaticn of the eci culation iniet nc::les.

(2)

'he licensee nas stated that the no::le c:nfiguration f One 2" instrument no::les in tne sessei neac =recluce a meaningful volumetri:

examination.

The staf', newever, Oces not centur ita the statement tnat tnere is net a no::le-to-vessel welc.

We c:ncluce that tne al arnative examinations wnica will :e :erformec, i.e.,

surface examination from the insice anc :utsice, are acecuate f0r providing an acce ta:le level of safety anc assurance that the structural integrity Of the 2" instrument no::les in tne vessel heac will not be c : remisec.

This relief recuest ':ay De granted.

(c) The licensee has c mmitted to :erform a surface exam (licuic pene-trant) in lieu Of -he volumetric examinaticn for One inner radiusec section 'of tne : Ore scray no::le.

This metncc of examination has

een requirac :n an augmentec casis for tne ins:ection :f no::les nere tne :resence of crac<s nas been sus:ectec.

We : nclude that the alternative ex2minati:n ;r:cosed s acecuate

'Or Or0 Vicing an acce:ta:1e level Of safety anc assurance taa*. One s t ry:*.u" a I ' S ta gr # ~.',, Of *.ne If' C re s ray "O!!Is =1

O e Sai n'.ai".eC.

~ is "elief *ecuest ay 29 grantec.

n 7773 cs !7

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Y l

. 7.

Reid ef Recues-C-5 Relief is recuestec from the vclume ric anc surface examina:icn of :ne ac::le-:c-safe end welcs in :ne reacter vessel.

(: tam i 1.3, Category 3 :).

ce Recuirement

=loiumet-ic in: sur#3:e examinations :erformed durinc ea: "nstection interva: sna. :o;er the circumference of 1005 of t"e ne cs icensee's Easis ;cr Recuestinc Relief (1) (a).

Nc::le-:0-safe enc welcs:

1 - 22" Recirculation Inlet; 12 - 16" Cutie:s; 2 - 1C" Unicacers; 4 - 10" Ca::ed Instruments; 1 - 4" Pcison.

(2).

Dissimilar "e:al Moz:le "elas: 5 - 2" Instrumen Due to nign raciation fielcs, :ne ins:ectacili y of :nese sa~. enc welcs will be ceterminec after :ne caemical cleaning.

At na: time, ne me ned of inscection or alternative test methed w;il be.cetarmined anc :ne inservice inscecticn program wi,ll :e revisec.

(2) Reac:or Cicsure Head Dissimilar "etal No::le 'cleids: 9 - 2" The nc::le configuration does not cravide access t: :erform a r.eaningf;l volumetric exam.

' sur# ace exam fr m the cu: side sur#ic:

will orovice an adecuate tes: ef weld integrity.

vaeuation (1) At present, the licensee has not sa-isfactorily ce:cnstratec :nat the examination of the safe end welds a e im ractical after enemic:i cleaning nas :een c:mpleted.

Since nigh radiation fields have been prctiematic in tne past with regarc to inscecting tnese.eics, ne position of the staff is that all nc::ia-::-safe end welcs :e examinec fellcwing ne :nemical cleaning.

This ;elief ecuest is, nerefore, deniec.

he cc::'es' size (2-incn), gecnetry, ard design :reven-neani ;#;i /:1 metric examination and tre Ti =nsee cas

r cse: s;r# ace examination as an alterna-'ve exan'ra:' n metnod. 3ecause Of the no::les' design and conditions to wnich they ;re subjected, the staf# finds that the croccsea surface examiasticn will rovide adecuate infor ation a

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3.

Relief Recuest C-6 Relief is recuested from tne volumetric examina icn of ne 56 reactor vessel closure nuts.

(Item 31.5 Ca.egory E-G-1).

Code Recuirement All the reac ce vessel closure nuts are :c receive a surf ace anc solumetric examination during :ne inscecticn interval -nen disasseacled.

Licensee's Basis :cr Recuestinc Refief For closure nuts, flaws critical to tne nut integrity woulc be criented longitudinally.

To cetect 'iaws with UT, a circumferen-ial scan soulc nave to be performed.

However, a circumferential scan would be meaningless cue 0 the tr.reacs interfering with the scund path.

On closure nuts, shculc cracks form, :ney woulc ini'tiate from :ne cutside surface.

Therefore, a surface exam is acequate to insure integrity.

Evaluation The licensee has stated :nat longitucinally crientec flaws (s71itting) would recuire an ul rasonic examina.icn performec frem :ne circumference of the nut to detect their presence.

Furtnermore, the licensee nas statec that the threads of nuts would interfere witn :ne scend cath anc acid precluce a meaningful examination for a circumferen.ial scan.

The staff concurs with this position.

The staf' considers the icngitudinal failure of the closure nuts of greater consecuence tnan a transverse failure emulating frem the thread of ne root.

The longitudinal failure cause the nut c lese i.s ability to perform its function wnere the transverse failure consequences :.re not as severe.

Later ecitions of tne ASME Ccce have changec recuiremen 3 te surf ace examinations as a result of tne problems in cerforming the volumetric examinations and the ability of the surf ace examination c de act cotantial flaws with safety significance.

This relief request may be grantec.

9.

?e'ie' Recuas:

-7 Relie' i s ecuestec " cm :ne volume:r'c examina:icn :f :ne N - 3ct:c-

~.'e s s e I anc * - T0c Vessel 3Lcccr:5.

Ccce TeCui ement

.re case :' s c:::r: 1.g at:acrments. ICCT, f =e e'ci g to :ne <essel s r.al

e exam' rec.

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.i:e-see,s as:s.-ar secuestir.c

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s ite.

Tne scacing between eacn bot:cm succor :ac 4: 11 net allow an angle :eam exam of the base metal tenea:n :ne support.elc.

Shouic cracks form, iney will initiate fr:m *ne surface On weicec sue:cr attachments, therefore, a surface exam woui: :s su:erior Oc a volumetric exam.

Evaluation 3ecause of the cesign of the vessel su or:s, at: ass :: the aeles is

,,mitec,.or performing volumetric examination.

Fur nermore, ne ne,ics are fillet welcs wnica are not amenacle to meaningful ultrasonic ins:ection.

...ne,ifcensee nas committac to cer,.orm surface examinations as an al:arnative to ne recuired examination.

The surface examination is caca:le of ce:e::ing inci ient crac.<ing at *ne more nigniy stressec regicas at the surface.

'se, therefore, conclude 'nat the alternative inspections are acequate # -

cravidirs an acceptacle level of safety 3rd assurar.ce that the structurai tegrity of the con:crent will not be compromised during tr.is ins:ecticn e n.a. a.

w r

n this basis, we :cnc'ade that the -elief reques: ta/ :e ; ranted.

seitef,ecuest u*3 w.

s Relief is recuested # rom the volumetric examination of :ne inner raciusec section of the feedwater condensata return anc manway nc::les in the steam drum.

(Category 3-0).

Code Recuirament The extent of examination of each no::le snali ::ver 1C0% of :ne volume to be inspectec as shewn in Figure Pn8-25CCD.

All no::les snall be examined curing eacn ins:ection interval.

L':ersee's Basis : r Recuestice Relie#

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. (2) 2 - 5" Concensate Return No::les Oue :: the no::le gecmetry anc configuration, it is act cossi le ::

exam the inner raciused section of tnese nc::les.

(3) 2 - 15" Manway Nc::les

' resent plans are 0 remove One tanway c: vers :nus gaining ac:ess ::

One ac::le inner raciusec section.

A sur' ace exam i 'e erf rmed in lieu of volumetric examina icn.

Shoulc cra:.<s 'Orm, tney wcuid initiate from :ne I.D. surface; therefore, a sur' ace exam is su:erior

the volumetric exam.

..:va watien (1) The licensee nas stated tnat the geccetry f the feecwater no::les recluce tneir eaningful UT examination witncut s:ecial tecnnicues.

The staff c:ncurs with this position.

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feecwater ac::les is consicered i :ortant anc -he licensee nas not satisf actorily cemonstrated taa the examinations using special tecnnicues are imcractical.

We concluce tna the examination shculc ce cerformed. At this time, One need for relief has not been satisfactorily demonstrated; :nerefore, no relief can be granted.

(2) 7he licensee has demonstrated tnat the emergency c:ncensate return ac::les are inaccessible for :erforming surf ace examination Of tne inner raciused section and of a gecmetric c:nfiguration no: amena le to ultrasonic examination.

Consicering the facts that:

(a) The ac::le inner radiused sections extenc in 0 tne 3 eam crum and are not cart of the pressure bcuncary.

(b) The nc::les are under water in tne steam drum and during heatup, cooldewn and normal 0:eration are maintained at "ne steam cr'.m tem erature.

(c) During ac:icen* concitions, :ne *.nermal cifferences Oe*. ween :ne steam Crum and the returning concensa a f :

ne emergency concenser are 1 w.

The nosition of :ne staf# is that tne exanination

1. tre emercency condensate return nozzlas is not recuirec.

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. For this reason, we conclude that the request f:r relief may be granted.

(3) ne licensee has mitted t: :erform a surf ace examina-ica of tne manway no::les in :ne steam crum in lieu of :ne scluretri: examina-tion recuired by the ASME S&PV Coce,Section X'.

The pcsition of the staff is tnat surface examination Of tha nc::le inner raciused section is an acce:ta le alter ative to Ne sciumetric examination recuirec Oy ne ASME S&PV Cace.

Surface examinati:n is the ac:e:tec metnod utili:ed to perform ne aucmentec 'ns:e:-icns recuired :y NUREG-0312 for the detec-icn of cracking in EnR fee: water anc ::n rol rod crive return line nc::les.

We ecccluce that the materials of ::nstruction, tne cc.:enent casign and ne inscections outlined 1:cve are adecuate for previcing an acceptacle level of safety anc assurance tna; tne s ru ural integrity of tnese ccmconents will not be c:moromised curing tnis ins:ection pericc.

3ased on the above, this relief request may te granted.

11.

Relief Recuest C-9 Relief is recuested frcm tne volumetric anc surf ace exanination :f ne nc::le-to-st'e end welcs in the steam drum.

(! am E 3.3, Ca eg:ry 3 -).

Cece Recuirement

.ine examination per, rmed during each inspection interval sna.l :over tne i

ircumference of 10C% of the welds.

Licensee's Basis For Recuestinc Relief No::le-to-Safe End 'delds:

12 - 16" Risers 10 - 16" Ocwncemers 2 - 3" Isolation :endenser 2 - 5"

• solation Cancenser 2 - 10" Feecwater Stand-of' insulaticn callars pr:nicit examinati:n of ne e d. i E/57;at :n a.

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. 3asec en ne 'ac-na: tne removal of :ne s anc-of' ::llars are feasicle, no relief from :ne examinatien recuirements is neecac a :nis t'me.

'2.

Relief Recuest C-10 Relief is recuested frcm the volumetric examinations Of tne steam crum su;; ort e.ds.. (. tem w 3. e, categcry :..).

2 i

-n

.v:ce,ecuirement s

In :ne case of vessel succort skirts, the examination :erformed during eacn inscection interval snali cover, at least, IC% of :ne circumference of tne welc to :ne vessei In :ne case of sup; ort 'ug attacnments,100%

of tne we!cing to tne vessel snall :e examinec.

Licensee's Basis cr Recuestinc Relief The /essel su:corts are fillet welced :: :ne vessel.

A meaningful volumetric exam of taese welcs is no; cssicle.

A surf ace exam oculc ce mere satisfact:ry since One cracks in 'illet welced succorts aculd :cs: likely initiate frc :ne 0.0. surf ace.

Evaluatien Secause of tne cesign of tne weld joint, tne vessel su::cr: is act amenable to meaningful ultrasonic ins:ecticn.

The licensee nas ::mmitted to perform a surf ace examination of :ne welcs.

The position of tne staff is that surface examination is an accectacle alternative examination of fillet welds wnere meaningful ultrasonic inscection is imcractical.

'We c:ncluce nat the materials of c:nstruction. One ccm:enent cesign anc tne inscections outlined above are acecuate 'cr :rovicing an acce :able levei of safety and assurance :na: ne structurai integrity of nese welcs will no; te comoromised curing tnis inscection pericc.

This reifef request may, therefore, be granted.

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3:=nsee's Basis :cr :ecuestinc Relief Nc::'e-::-Safe Enc 'aeics:

1 - 22" Recirculati:n 'niet 1 - 18" Recirculation Ou 'et

anc-0,.,. insulation co,ilars pronibit examinati:n of rese,e.cs.

valua 1cn

ee.selier Request

,-r.

his relief recuest is cenied at :nis time.

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Relief Recuest C-12 Relief is recues ec ' 0.m surf ace anc visual exami a:i:n racuirecen 3 'or

ne calcading heat excnar.ger cuno suoports.

(I:ea C 3.3 & C 3.2, Categcries 0-E-1 and C-E-2).

' ce secuirements

-..ne examinations :erformed curing eacn inssec-ion i, arval sna,i.

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.ine examina:1cn cer,.croec during each ins;a:: en interval saal.

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ver all sue:cr: c:mconents.

.icer.see's Basis er Recuestinc Relief

.in,.ormation ::ncerning um: sue:cr:s is not avaliacie.

ne cum:s are in a nign -adiation fiele making it im:cssible to ma<a a fiel neck of the succerts.

After the enemical cleaning, the :umo su::cets will :e verifiec anc, if :ossible, the c:ce recuirements.ill ce met.

c ce recui ements cannot be met, a relief recuest er al ar a ive exam

:e su:-i te: f:r 10 r: val.

Iva'uation

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Relie' Re uest '-13 Relief is recuested from the volumetric examination recuirements for :ne fallcwing welcs in :ne nuclear steam su:Oly, main steam and primary feecwater systems (*:em 34.5, Category 5-0) (::em C2.1, Ca egories C-G, C-?).

Class 1:

2:11-10 Class 2:

0701-13, weld 19NA; 0702-13, elc 195A; 1612-10, weld 24 Cace Receirenent Com=onents snall be examined in acc:rcance sitn :ne recuirements specifiec in Ta:les :%B-2500 anc :'WC-2520.

Categories 3-J, C-F anc C-G shall :e volumetrically examined Over 10C% :f the eld.

Licensee's Basis for Recuestin Relief

~he eles. are cartial penetration welcs anc canno: :e examined volumetrically.

Surface ins:ection 4ill :e performed as an alterna-ive examina-icn.

Evaluation The staf#'s positi:n is tna: r.e welcs statec a:cve snould :e examinec as picing welcs, Categories 3-J and C-F/C-G.

he we,ics in cuestien are partial :enetrat:cn we,ics wni:n are not amenac,ie t

to volumetric ins:ection. These types of welcs are not as hignly stressac as full penetration welds.

The 20re nignly stressed Ocrtien of tne elds will receive a surf ace examination wnica will locate any cisc:ntinuities

.nica may te present.

The staff consicers that this level of examina icn sill provice acecuate assurance tna :ne integrity :f tne c mconent will Oe maintained during tais inspection pericc.

Cn this tatis, the relief recuest may be grantec.

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ne :na ;es : -he ecnnical 5:eci#ications for the inservice ins ection ort on recuested in :ne licensee's acclication dated November 2, 1977, i

nfern :: :ne sanole Tecrnical Scecificaticos enclosed wi:n cur letter ta :ne licensee da:ec ';ril 22, l?75.

The revisec 'echnical 5:ecificarians recuire all inservice inscecticns to be cer#crmed in accoccarce with Section

(:

1. :ne 'SME Sciler inc ressure '!essel C:de anc acclicable adder.ca as recu irec ;) 10 : :

ar-50, Iection 50.55a(;', exce t <,nere sceci#ic wri::en re'ief has been ;rinted oy :ne C:nnission cursuant :o Section

50. 55a l ;. 6 ' f i ', :e#' ec in : arts :, :: anc ::: of this Safety Evaluation.

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53 9A;M - INSE:?! ICE I1SPECTION PROGRAM We find tna: :ne Inservice Inspection Program (excluding pumos and valves) for :ne Dresden Station Unit No.1 meets the requirements of caragrach (g) of 10 CFR Part 50.55a, " Inservice Inscection Requirements," and that the pectosed changes to the Technical Specifications are acceptable.

Pursuant to 10 CFR Part 50.55a(g)(5)(i), we have granted relief frcm scecific recuirements, stated in :ne ASME 3&PV Code,Section XI,1974 edition including the Sumer 1975 Addenda, which we have concluded to be imcractical for this facility because of the component or system design, gecmetry, or materials of construction of the components.

In some cases, relief was granted only af ter imcosing the alternate inscection requirements.

On this basis, we find the requested relief is authorized by law, will not endanger life or property or the comon defense and security and is otherwise in the public interest giving due consideration to the burden upon the licensee that could result if the requirements were imposed on the facility.

ENVIRONMEFAL CCNSIDERATION

'.le have determined that the amendment and the granting of the recuests for relief do not authorize a change in effluent tyces or :ctal amcunts nor an increase in power level and will not result in any significant environmental in::a c t. Having made this determination, we have further concluded nat the amendment anc relief involve actions wnich are insigniticant from the stand-coint of environmental inpact and, pursuant to 10 CFR !51.5(d)(J), that an environmental imcact statement or negative declaration and environmental imcact acoraisal need not be orecared in connection with the issuance of these actions.

CCNCLUSION We have concludec, based on the considerations discussed above, that:

(i} because the amencment does not involve a significant increase in the cr:bability or consecuences of accidents creviously considered and does not involve a significant decrease in a safety margin, the amendment dces not involve a significant hazards consideration, (2) there is reasonable assurance ina: :ne healtn and safety of the Cublic will not be encangered by Ocerati:n in the cr000 sed manner, and (3) such activities will De

rcucted in : noliance with tne C mission's regulations ano tne issuance of this amercment will not be inimical 50 9.e conren defense and securit, Or :0 :ne nealth and safetv of the ::ublic.

23:e:

Se: tenter 23, 1979 M 7.9

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