ML13038A420

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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)
v • d • e


Text

Dc:cemeber 9 97 4SAET 3II 19 - NNgTITVE. EXA9NTIN F RIMALRY CONTAINMENT. LINERS . .

'General h~ig Crteio rqure-thatt compnnts1 important to ,.

.. safety fri fbe atid --toquality- stana rdsd insurýt:vi.th

'co the imp*.r.anee. .of the s*af*ety fuI ý ion b",!to be pfoteo -hie ýheaktiiht qI4~ e e. re'

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I .inte~grityo the.-primary containment lIne nd ito penetrations. is 4.......I...

cfeky..eva 1n s luatioins. This guideldsr ibes..,

accep" a -..prc fo'r:implemtin. oures .: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

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destructivee apedainat*e.aoof Suchlatý.d.tight mebranes. These procedures' viiprovide unfrmqaity ua level cnistn w*ith theýs~afety wil e a.. f:1 qu  :.hn fuctvioa oOf-conta-inment. liners.

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,b~ .iner.-of. conventional-ly reinoce  :'or * -r** .

stressed: ednrete .reactor containment st-rUctures tshoud.be.nondestruc-tively exaM.ed using the fo.-lowing. gpro.cedures*: '.."

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1.-odetrcivez 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. tu ).orv frlact ion the~reof should be examined radiogaphically in.SCcodmce . ... .-

ith :the techn-iques prescribed in 'Section V of the* e.

Boiler and- Pressure Vessel Co~de :(ASME A&PV Code)-No"aestructive,:

Ex..ination. In .any case., a i*nimum of 2 .:percen of al liner. -

ie"m wvelds should.be examined .,byradiography,.,

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g. r ographidc* intion ,ofliner seamve.d. is.not - .

feasible or wh.re.* the-ld ... i* ted in areas: viý.i. .hih not-be accessible6 after: construct-ion., ýthe:etie length of:-

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wel shodi :lie* xam"i'n>d thd' i ri eto .... ......

,, 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-aapplied 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 -differential-:with, the amo Fspheric pressurez. Leaks in welds if Presentý, should

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IF'. bedtcted by formation. of bubbles The:sltonue "F-F "1F4F"><" *i!

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F ~~for the test should have bubble_'formato proets F::} F ,tv FuFt ':ty adequate

.l ut for identification

. -of leaks:. The te souion

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I m~.tl ~eelg te reeasa OU [n (r:;:,'FF- F., F' should be~checked eve~ry,:hour,. with asuitble t's lv kF~

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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 weld.gshouýld.be*t1.est.d for S.pleaks ibeds Seby eosuriz.ti.S of the'.o hl.. to ..FF 19 jFFFF F

di;~ sho Id be2 soa bubl- cora~evt:ti-bepoeue FAAtdi a ontAllwinbentwueen~ prnessre.o any retort ;pn Ap'"t

ii~*::.**:*.,** ".'**.!*.:.6* . framnelo All tatirelocre between flue anoccers "alds fittings Wpnng, and-

, - pipe,6hI.LLI lines: should .*:*/. be*/.'*!-:*:=**

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i ograph.ed!

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accord.:a..nce* w.*-ith,*/ the**:/ techni..ques/*. pr e. scr**/:*

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...***:::** ;'*' i-:i* *'*IL:%!c.. : All velds  :*  ::,:*****': bellova  ::; type::,

,in ex an ion: jo*::*i ntsi:* provided: /./*  ;, in::/,!**'=!-::::i: *!*'. i

... : ,* ~i:':!:penetrat

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  • io estwgauen assemblies*,. thue or; chatnnl-to-liner appurtenancesi  :*/!-i*i: wiels to the shouldobe conta::/*!

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.icle pen.' e. trant"--:,:.=: tested fulap buablegtephed in accordance. with the abovniqee pro edure. ,e "I*~*:'!.**

Ai' Inesrction Son Vxmnto of teAIEBPenCoetro. Arok n Acs c., All ngwe-Ids in belw tyeepninAit~rvie.i

  • soap buuihee n tmgest weld is usccodae inth accordance withotedue:;i: -*l!i i a.Alwlsbtenpenetration andmbie oraprteinfarcing tolate, poonetr. M

techiqus pescrbedin ectin Vof SME &PVCod fo resel.nsouldn plae akndtlin r, peetorato c rei dlt frcn airdP

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suchexadna io ethoc.t u wexeino~*=&*I~e ii~~i amined jgetcwl accordance' and inIterpeetra.*io.

with i t exmntinhtod r~t*f*--ctigi~pk-:fN.-lOe [*A- A

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~ms tehius o rescri ~~ok:ad inbedd Section 19 the10 eces V ofASE pnAg

. s4o Code.fo B&PV dA:*ly

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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 qualif ied in accor-dance with %theprovisions: 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

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AD toot units should be: closer than 10 f eet and their location should: be recorded.

6.Thpikls .of ELxsuizatijnl af ter-All' ezmmnatians should be performed an soon as pr .acticable the lineal increment of wld to be examined is: completed..

[bre 7.it I the seak werld' is judged a~cc table in ac Ivwth, the rfradstnrs

dam fN310of section 111 o1- the ASHE EPV. Code., the entlire vidld test unit rep-resented-by this spot radiograph is acceptbe

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SeaI . el-dse.iminedby II .. ultraloniccom I tpl**e i icle-meIthods I i II I pr,6*ýk.44, 6 a e a c 14-ar4ccepal rvddte xmntosaeatablal by he st refrne e ' iandards 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 166r S earsWldsExamined by aiaah When a radiogi aphed .-Spot. filsi to ets the 0pecIfid'

.... tce y xaMnai L.0 tit ' additional: spots shoultd be. radiograph- 4.

id In ,the: saue weldi test un it At lociiatin -a t4 4:- .... , : .

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AII e) fro m t he .o r i gi n a l spo t . "... ..' :':+' +:

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leart: Ohm-foot remoed- (an:each sid4

Me oca0toans of that* additional s'pots should be determined by the ezn.air. Using the same:.proc edure folloed: in the selection: of the original spot for: examinationand the exiamlition results. should deterain e the following corrective actlons:

(1) If the tao additionalspots oxwdined meet the specified .

acceptance standards, the enti re weld unit represented by the three spot radiographs is acceptable. Hovever, the defective welding disclose dby the first of the three radiographs should be re 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 NN 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*.

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Cbontainrent 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

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