ML19332E884

Speech Entitled, NRC Piping Design Research, Presented at 890814-18 SMiRT-10 Conference in Anaheim,Ca

ML19332E884
Person / Time
Issue date:	08/14/1989
From:	Guzy D NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To:
References
NUDOCS 8912130105
Download: ML19332E884 (7)

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SM1RT-10 Date & Place:

August 14 - 18. 1989 -- Anaheim, California 9

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J int,s..etten in recent

,e.,s, the et. office of toties, tes.iete,, te.ootch hos s,enee,ed end completed severet teseerth projects to evolvete nwetest plemt ptplag design precedures for dyneels loods. this reseetch is letsely in response to the teteesendettens of the att piping teview Cemettlee, speelffed in SURIS teet Wolvoes I, 4, end 5 (tef erences 1*3). the fosoittee concluded that the piples dymeett lead design etttette and ptottlees tes they esisted in the old*1930'el este evetty.conservettve. it recessereed eleost twenty tegutetery and tesserth et'. tens that were intended to lead to leproved dymeals need design. This paper will sweeertte the attasponseted reseerth estivttles. for este inforeetten en the isoves behind this reseerth end its plomming, the i

teeder should ref er to the att piples teseerth prestos plan (Ref erence 4).

Pipe Deeping At the time of the piping tevlev tessittee's evolwetten (1983*1935), lepteve*

oente to dymeelt response cettelettent seeeed to provide the best etternettves for toducimg emnetessary comeervollees in the piplag desten protese. Thus e vett6ty of etenderde end teseerth estivities address tes emelytitet response cetteetten technteves were sede. these involwing the use of highet deeping velves have been thewn to be the most inftwentist, both in a tethaltet sense (tetetente l) and in a reputatory sense. While severet teettittlems have been edded, the endorsement of Alat Code Case t*411 throwgh tevlelems 24 end Il of l

Sepuletery guide 1.84 le the tenet ttee8 e only totessended regulatory attlen effecting the seteele desten of piping that hos been leptemented genertselly.

Until recently, the att* sponsored pipe gespleg Study project et idehe sottenal (melmeettes Lebaratory (1985) has been the esjet tesserth centelbutor in the eres of pipe desping. lett studies tieferences 6 through 13) supported both the developeent of the pytt pipe desping critorie (teferentes 11 end it) and ii. este,ionte by ihe ste, in additten, lett...i..a high fre...ty pi,.

d.oping d.i.

<tefer. ate i3) and proposed a nem deeping surve that in effect raises the pVit's curve to 31 Weepthy in the high fre.wenty reglee end eatends its ronge wp to top 88. the evet technical and Stetting Coselttees en piping Systees sedereed this proa posed criterte end rettesended that it be tensidered in the Altt's revisten of Appendla 8 (distwesed below).

In other tests, letL het provided stettstiset deettipttens of pipe desping teeferente

1 tot use in probabilistle studies, and hos evolveted pipe 4

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-Q Weaples in the high streth replee (tetetemte it). The letter study helps Jwstifying the preelte that low estlestes of pipe desping ett selfasertettime.

• L that is, eithewsb e Sectiewter piples system's desping eight be tevet then j

stee generle volve used for declan lood levels, very high desplog will be prodyted bef ote f ellure levet s ete opptoothed. 1981 continwee to tellett end s

evolvete sospime date free new bigh Levet dybests teste of piples systees.

f the Alti tesh Steep on gespied new is revleing the pipe deepthe criterte given th Appendit e of lettlen Ill of the Albt geltet end pressure vesset tode. This a

thente will supettede tode tese e.411. A totent tell/gethlet evolvetten of the 1

taisting pipe Weepins dote bees (teference 16) tes sede to support thle I

offert. It to heped that eventwetty begulatety $ wide 1.61 tem be tevised to teferente this meu pipe desplag setterte. The ett etsff end 1884 ore following end contributtrig to the Atut effett, i

Independent support gotten method the lhdependent $wpport Wetten ll8N) eethod le used to estlette Wymeals reopense for teses whete the leaptent tospense spectre Wlffet for the verleve growps of esppetts in a piping systes. It to owpposed to yletd eere satutete resette then eenventlenet envetepe seestre methods, and it is hoped that the letteeted emelytitel fleet involved would be toesteed by teseet requited tospense sergies.

A speelfte 189 procedure was reteesended in Vetwee 4 of tutt$ 1961. Sewever there since beve been unresolved questleet ebewt its use in tenjunction with Code tese ga411 and suggestions that the square *reet**f*theasws*efatheastwetes (4t88) procedure be weed in ptete of the obsolute sus (Agt) procedure fet toebining suppett group tesponses. These 18m loswee beve been resolved for specific licensteg asses, but het en e gemette bests.

greethoven Wettemet Laboratory (64L) wee fwnded to revisit theft previews llu study (Refetence 17) and evetvete the effects of Code tese W*411 desplete plus l

io iees ee,e tes,,themsivei, ei the.B. ve,sw..g grew, sweesiion isswe. ihe

.ew est sted, it<fe, ente ig) tentiwded ihei the i. esihed used i tenjunction with code tese 8 411 desping produces relative response eergin tremde sieller to those seen previewsly, and that, evtpristmely, the ISN/SB4S procedute gives resulte toppetable to the senventlenet enveloped spectre eethod.

The pVet test Growp on lla was thertered to provide induetty guldence end hos teviewed the twe 884 studles along with other reseerth studies (References te end 8t) and Licenstes teses. An lopettent contlwolen of the task grepp to that how toppett grewps are defined is es algnitttemt es that stowp swoottlen precedures are used. In hindsight, it has been found t h -a t $st's grouplmg pretedures were imepptopflete end this towsed etypitet teswits. Newevet, pette i

of teferentes 17 and is are beleg used to owpport the test group's totesten*

j dettene, new undet development.

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vh. evec test stew, en tsa mes reised emother point not futty undersieed when i

the peptes leview teselttee sede its evenwetten. ihet to, the lam nethod shouts be used for enty a very Limited esewnt of piping omstysis problese, enty these beving very signifteent differences in support growp impwt spectre.

The pWtt task group thewld provide twidente en the lle method in 1989. It is hoped that thle gwidente will be estoptobte to the ett end eventually could be teferenced in settlen 3.g.2 of the stenders Review plan.

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l Ctes4.y*Speted and tigh frequency pedes to address reseetch reteneemded in volume 4 of tutts 1961, StL has been evolveting proposed response spectre technleves to better etteunt for elesely*

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e dybeelt leeds steled il to 30 times higher then typleet desten voices. the fellvte mothentses note diffetent then what ses easweed when the tuttent Alpt Code piplag design twies weFe developed. That 16, plples twptwtg ses due to 4,

retchetting end felleve effects omd stess'settlemet tettspse did met estur, Sometal tiettels is mes develeples e flest proposet for tevistas the piples dymente feed ettees atiterle given in settlen lit of the Aset gettet end pressute vesset tede. ser sehtepts for piping design twies have been discussed i

5 with stemdatas stowps end the ett stoff. A ptopesed tede rettelen should be A

Introduced fotootty to the aset in the felt of 1930. All fleeL toporte fet t%e j

pipime end fitting gymeale get tsbility prestes should be published by 1935 in 1930.

the ett het eLee tentributed to the high levet piples test et the gDy fetitity (gefetente 23). While the piples itself ess met tuptwted, it eso shown that selsett Leeds et least eight stoes greater then design (Level D) volves tould be sosteined.

piping 4etthevoke tapettente Sete l

i there is en estensive end greeles Jete base of settbewebe espettente fet l

piping in heavy ladustrlet f atitttles (tef orences to end 30). The reesttable success tete f or shove *gtowns solded ateel plplet het been fettered inte the developeeht of mov selsett evettetten procedures (i.e.,

setsott pgA's,

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settels setgles revleus

• gef orente 34, and Usl A*46. Referente 32), and hoe c

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been used duciitotiveir to sweport actions leiended to tenen piping seisois l

design etsietis. ee.ev.t. ibis deie is yet to be weed direttiv in the nutiest pipime desten process.

The'006 gldge tellemet Leberatory (Dett) and its comttesters et. twerently investigating the possible use of Ull &*46 type bounding spectre fet piping Wesign, desweentime the design precedures weed for the piples in the date l

bese, and duentifying sletteeltles 6mW diftetemaet between nom *mwelter end I

muttest plemt piping. thle study alti be toepleted la tege end ety teed to e signifteemt departure free tuttent emolylitelly*besed design prettless.

sessie end granth tennettlen Deslen the piping geview tessittee recessendes that recesteh to develop leproved l

resign guldente en not Le stress lletto end flesibility. OlbL het toopleted

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l three related studies (teforences 33*35), and is mov finishlag new guldente en nettle fie.lbliny.sitteiien. The i.iie, she id heip i.,reve the design of j

ylples eyeteos that ete connected to tenke end thin

• wetted pressute vessels.

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sisteselon end Constwetene as e resvit of the ett piping Review teselstee's tenterne end reste emdettens, the Of fice of tutteer Regulatory gesesteh hos sponsored severtl projects to evoluete end lepteve the dyneels lead design of mutteet power plant piples.

The mejerity of these testetth projette have been toepleted, et will be completed in lege.

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White the new research results have retted technitet leswes. most leportantly j

that fetteve et fatigue tetthetting (not tellepse) is the bounding felture l

l eettonism for test dynsett lead cases, they fortweetely else have desenstested very large sorgthe*te*f eilute f or piples subjected to dyneels lhettle leads.

ge. high tevel tesis and the revle of eerihevote emperiente e.to heve done euch in the test four years to leprove eve opprettetten of the inhereet robustness of welded stael piping. This kneeledge hos been weed in the dev.

elopment of new selselt evetwetten procedures (e.g.,

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