ML13038A420

Safety Guide 19, Nondestructive Examination of Primary Containment Liners

ML13038A420
Person / Time
Issue date:	12/29/1971
From:	Office of Nuclear Regulatory Research, US Atomic Energy Commission (AEC)
To:
References
SG-19
Download: ML13038A420 (8)

Text

Dc:cemeber 9 97* ......* .... ...* .... " : 4SAET 3II 19 -NNgTITVE.

EXA9NTIN F RIMALRY CONTAINMENT.

LINERS ..'General h~ig Crteio rqure-thatt compnnts1 important to ,...safety fbe fri atid --toquality-stana rdsd 'co insurýt:vi.th the... 1Y7ýktai AV... a.. urke..imp*.r.anee. .of the fuI ion ý b",!to be pfoteo -hie ýheaktiiht qI4~ e e. re'4.......I...

I .inte~grityo the.- primary containment lIne nd ito penetrations.

is 1n s cfeky..eva luatioins.

This guideldsr ibes.., accep" a -..prc oures fo'r:implemtin.

.:this criteri on by the use -of'Koude-atru tv'thod to exaninte the velds In %thliesan j.*--p~ertowOf.

ýp iasryreactor contilai~nmeta of- concrete#

con trcio 44 .'Ca Ya. p____There a, no.: d~etly :ap a -Pd.r codes that coer the 44-i 14 Be--;- ,omesru R.e dntor 'oapconaien stee lie nd.eet o-'voids iC94conerete co tainuents Curren r-idutr practic s Afgeeray nase uoteapiation of oroion 'C of SctinI-ins fa: re" sit'- ' a ope ra.i n I; ..... * ...... ' th se p.ct..e .avAi f tred. .. ..4!..

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These procedures'

.viiprovide ua unfrmqaity level cnistn w*ith theýs~afety wil e a.. f:1 :.hn qu : fuctvioa oOf-conta-inment.

liners. K Seamwels n". ,b~ stel .iner.-of.

conventional-ly reinoce :'or .stressed:

ednrete .reactor containment st-rUctures tshoud.be.nondestruc-tively exaM.ed using the fo.-lowing.

'.." 1. ~ z -odetrcive Ewandn.Ation.:of ,Lin Stain Welds a. For eadh welder and welding positi-on (flat:t, c, hiorkzontal, and. overheiad)', the: fi-rst 10 feet of...eld, -and ane apot (not les~s :than 12: inches, in leng-th) in:each-.

addi-!!tional 50, foot increment of weld. f(weld; t. t u ).orv frlact ion the~reof should be examined radiogaphically in.SCcodmce

.... .-ith :the techn-iques prescribed in 'Section V of e.Boiler and- Pressure Vessel Co~de :(ASME A&PV Code)-No"aestructive,:

Ex..ination.

In .any case., a of 2 .:percen of al liner. -ie"m wvelds should.be examined .,by radiography,., g. .f.i~re r intion ,of liner seamve.d.

is.not -.feasible or wh.re.* the-ld i* ...ted in areas: .hih viý.i.not-be accessible6 after: construct-ion., ýthe:etie length of:-1 7.-. ..19.2:.;{" y* .'.

.

wel shodi xam"i'n>d

.... thd' ......i ri eto:" "" ' b "':.' "" .. ." -" * * -, , '" , , 'F ' "" " 4'i" ~ f... ." 4F " ; "T ',h " < '--,, t e.'F,,~j by the ult-rasaonc lithod in accordance wthth 't'chni que prescribed in Sectioni V of the ASAE R&PV 'Code, for suc examination method~s.c., All liner seam weldb ýshould be tes-ted. for leak tih'ssi accordance with the following, -method (or other ueýhdds of eq~uivalent sensitivity):

lindiately preceding the test, a soap soluition

(or F other appropriate solution) should be-a applied t h weld. A vacuum box containing a viewing window sh'ouldF be pl-aced over the area to be teste ~d.-n evacuated to produce at. least a 5 psi -dif ferential-:with, the amo Fspheric pressurez.

Leaks in welds if Presentý, should bedtcted by formation.

of bubbles The:sltonue F ~~for the test should have bubble_'formato proets adequate for identification -of leaks:. The te -souion F should be~checked eve~ry,:hour,.

with asuitble t's lv kF~to verify the! bubble formation:

property of: th sluto FJF ~used.A. Mhore "-"k' chase. a. stem channels "r* inst-"lle .oe 'i or:e welds, chann.e.-to-liner-plat for S.pleaks ibeds by Se eosuriz.ti.S .o of the' ..hl.. to FF 19 jFFFF F IF'. * : * ..0, .... -'.F F .::~ F' "F-F "1F4F "><" i ...' ...... .. .. ... .." ,. ..." ..... ..- ,. .., .. " .-:' : :i: .:I: :,, ':* .c.. &U ~ ne 8e .. 8ho~l~.:..b .t .£ ..:.t~g!..tue F F::} F ,tv .l ut FuFt ':ty .*

F'.F., I m~.tl ~eelg te reeasa OU [n (r:;:,'FF-FF '. " £r:

di;~ sho Id be2 soa bubl- FAAtdi cora~evt:ti-bepoeue a ontAllwinbentwueen~

prnessre.o any retort Ap'"t ;pn framnelo tatirelocre anoccers Wpnng, 6hI.LLI -Aul~by the tad estwgauen thue chatnnl-to-liner wiels shouldobe

~fulap buablegtephed in accordance.

with the abovniqee pro edure. ,e In Son esrction Vxmnto of teAIEBPenCoetro.

Arok n Acs c., All ngwe-Ids in belw tyeepninAit~rvie.i a.Alwlsbtenpenetration andmbie oraprteinfarcing tolate, poonetr.resel.nsouldn plae akndt lin r, c peetorato rei frcn dlt airdP wex amined jgetcwl i t in accordance' with exmntinhtod fN.-lOe tehius rescri bedd in Section .V of the10 ASE B&PV .Code.fo 19A

.All "alds between flue fittings , and- pipe, lines: should

= i ograph.ed! ,in

!,f.:,

pr e.

h... :.: :,, i n S i V,!: =%.:i ,: of the ASME. B&P C ode.:

.

i. T i,/ ...**

.. All

velds ,in bellova type

:, ex an ion: provided: ;, in::/, i

...: ~i:':!:penetrat

• io or; appurtenancesi to the i : A .-": "'?!="!:' " * *" .sse..l .:hu d b m g e i * "ar "': "" .icle " " or li ui pen.' e. trant"--:,:.=:

tested :-

Ai'soap buuihee n tmgest weld is usccodae inth accordance withotedue:;i: i Mtechiqus pescrbedin ectin Vof SME &PVCod fo-; :. **A :'suchexadna io ethoc.t u ii~~i and A'A' A 2 19 ~ms o ~~ok:ad eces pnAg s4o .. ...i Al -2 A' ' .-! :- A n S'A o A At 1 SIE o e.:::ii !

4. g1mAsiftdAttion of. Weilde.ad edizrodre The qualificati ns iof Aeldrs adr beld ptf r*Oceu. shudb Wnesructve ezasiaioshldbpeord by' personn'J designated by-the Licensee or his agent and q ualif ied in accor-dance with %the provisions:

of Section V of the ASME. B&PV Code.5. SeLect-forn of Spots, for: Radio-sraphic.

Exami-nation The spots In liner sea, velds to be rad~iograph-ca~lly examined should be randowly se-lectted:

but no two spots in adjacent weld AD toot units should be: closer than 10 f eet and their location should: be recorded.6.Thpikls .of ELxsuizatijnl All' ezmmnatians should be performed an soon as pr .acticable af ter-the lineal increment of wld to be examined is: completed..

[bre 7.it I the seak werld' is judged a~cc table in ac :dam Iv wth, the rfradstnrs fN310of section 111 o1- the ASHE EPV. Code., the entlire vidld test unit rep-resented-by this spot radiograph is acceptbe:-,C ,' ,-.. ..:-,.-,.'-

,,,. .g , ; , ' -;':':' : r "L""' .,,.I ""m '"'.- :- --':' -i :" -' '.::': : .:'" :: ' ' '/ ': ' '

4- , -.. .--4 p4- : SeaI .II el-dse.iminedby

.. ultralonic com I i icle-meIthods I i II I pr,6*ýk.44, 6 14- a e a c ar4ccepal rvddte xmntosaeatablal by he st e ' iandards refrne or. such 'examkiniatio mehds NE-5120 olf Section 11-1 of the, ASME B&PV tCode.c. Soapý;. Bbleý Leak %Tests',o~f Contini ent -L iner Weldsp 4-4 Liner welds are acceptAb~le provided.

no lekge.: isde. ce 4,by; soap bubb-le tests (or by other methods of equivalenit Ii sensitivity).

d. Penetration, Airlock anid::Access ,Ooend.Oiu Welds, Penetration, airlock,.

and access openinge welds are acceptable4 provided the exwainations are acceptable by the: referen~ced standard of NIE-5120 of Section III of the A.SH! B&PV Code.Welds. in bellows type expansion Joints are% :acceptable, if the.exraminattions meet. the acceptance satindards referenced:

for 4 l44 Magnetic particle and liquid penetrant methods in ftaE5l'20 of Sect-ion 111.A.* Coitaisen:

LlI When a radiogi....y tce xaMnai 4:- .... , : .Li 4 4-.. , v.4 .. ' --166r S aphed L.0 tit id In ears WldsExamined by aiaah.-Spot. filsi to ets the 0pecIfid additional:

spots shoultd be. radiograph-4.,the: saue weldi test un it At lociiatin -a t4 19.6.. '* 4-.:... ..-', 44,4.:. .4.-4" 4.., ..

--44 ... .. .. : ,- 4 4 :' ::-;:

AII leart: Ohm-foot remoed- (an:each sid4:Me oca0toans of that* additional s'by the ezn.air. Using the same:.proc selection:

of the original spot for: exiamlition results. should deterain actlons: (1) If the tao additionalspots ox acceptance standards, the enti by the three spot radiographs the defective welding disclose three radiographs should be re e ) f r o m t h e .o r i g i n a l s p o t ." .....' : ' : + ' +: + .-i + i -+ : ;pots should be determined edure folloed: in the examinationand the e the following corrective wdined meet the specified

.re weld unit represented is acceptable.

Hovever, dby the first of the paired by welding..(2) If either of the two additional spots examined fails to weewt the specified acceptance standards, the entireweld tost unit is not acceptable.

The entire untccepteadweld should be removed mnid the Joint should be rewelded or, optionally,, the entire weld unit may be completely radiographed and:.defective welding only need be repaired.(3) Repair welding should be performed using a qualified procedure as specif.ied underSection C .3 of this guide.The weld repaired areas in each weld test it sahould be spot radlegraphad at one selected location to meat the acceptulce criterti specified in Sections 7a. or 8w. (1)of this Said*.NN

• :,i,

......... ...... .. .........

... ......,. .,.:. .: Cb ontainrent Liner Seam Welds Examined b:y Magietic, Par.t"cle When a weld which has been -2xamined.

does not c:mp lywi.th".the specified acceptance standards, the weld should be:.;repaired and reexamined in accordance with the provisions

.of Section III of the ASME B&PV Code.C. Soap Bubble Tests of Containment Liner Welds.Welds jud'ged unacceptable in accordance with the standard's of Section C.7..c of this: guide should be repaired.

Repair '"9 welding shoul.d be performed using a qualified procedure as.specified under Section C.3. The weld repa-ired areas should'be reexamined by the same methods used previously, e.g., radiography, magnetic particle, etc., in conjunction with 'soap bubble leakage retesting.

.d. Penetration, Airlock and Access Opening Welds i9 ...: '.2 i ,? 'Welds judged unacceptable in accordance with Section C.7.d,.of this guide should be repaired.

and reexamined.in c 'with the provisions of Section III of the ASME B'&PV Code-. , 9. 9 9. Records .,.Records of radiographs and other nondestructive examinations including the-se for repaired defective welds should be ret.a-ine'd.

' 'r -by the licensee in compliance with the provisions of Section X'Vcib , Quality Assurance Records, Appendix B of 10 GFR Part 50.19.8 d..9 .* ...!q

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