ML102770417
| ML102770417 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 09/29/2010 |
| From: | Wheelwright F Dresser |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML102770417 (5) | |
Text
0913012010 U.S. Nuclear Regulatory Commission Operations Center Event Report Pa,-e I General Information or Other (PAR)
Event#
46289 Rep Org: DRESSER MASONEILAN Notification Date / Time: 09/29/2010 15:00 (EDT)
Supplier: DRESSER MASONEILAN Event Date / Time: 09/29/2010 (EDT)
Last Modification: 09/29/2010 Region:
1 Docket #:
City: AVON Agreement State:
Yes County:
License #:
State:
MA NRC Notified by: FRANK WHEELRIGHT Notifications: MEL GRAY R1DO HQ Ops Officer: ERIC SIMPSON MARK LESSER R2DO Emergency Class: NON EMERGENCY STEVE ORTH R3DO 10 CFR Section:
THOMAS FARNHOLTZ R4DO 21.21 UNSPECIFIED PARAGRAPH PART 21 GROUP EMAIL POTENTIAL ISSUES WITH CERTAIN REGULATOR MODEL 77N-40 AIR REGULATORS Dresser Masoneilan initiated a 10 CFR Part 21 investigation because of the failure of three (3) Air Regulators (model number 77N-40) at the PSE&G Salem Station within three months of being installed. Upon testing and evaluation, Dresser Masoneilan concluded that the internal O-ring used for pressure isolation in the Air Regulators were damaged during factory assembly contributing to the failure of the units to regulate pressure. Dresser Masoneilan has developed a corrective action plan and an in-service test method and acceptance criteria to determine if a unit is experiencing pressure loss due to the issue. Due to the volume, age and distribution of these models, Dresser Masoneilan is issuing a general notice to all utilities.
Contact Bill Comeau of Dresser Masoneilan at (508) 941-5477 with any questions concerning this notification.
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ntmi ~sk To W~hon it Ma4y Concern' DYrnssem NVasoncu Ian initiated
.10 Ocm Par 21 0v:&fi-sjqt p o~iz 61:s dth' ft itro fIth~~~
{moodla: numrber 771R40). (the "Reuaos) at the PS'*E&G: ýSa'e tto ihntr~mnhn bin insalled, P$S &C-nctdfiod our 1f'acilitY of the failues; on July 27,-2010.
Upon:.testitg a nrd bvalda:io, naDses erMa."(1ilanl :concdtided that the, ifternl: 0kiring used. foi piessue isolation in :the Reguatr wereA damged. du.ring factory asmbly Oontribij~fin to::ttea~ilture of the: Ubit to regulate pressure. Because of* thpe.*age t
(the O%.ib.
the.Regulators h ad exce mive intertal leaage wCh impacte te abHiity4t mnirtai th et Oress'e thsinrasing the IUpw patt:0lefVleai aUsing an itc'rease~d flwIrr h eifhl.Tedetails:o~f. thp vlainadtsig~dtecretv action pilan are, described in sAttachrnerit o thi notficton, Theme have been no* repoited: falllures: of: theý Model -77N-4,. but: this mopde shas :like. cono~ns d poeswhich exposes the product to the satrte po~tetial d~efects, This model Reguiator hlas been sold for use on our. equipment fromi the. md., :980's to the present.. We believe that similar-model air rtegulator:sthat exhibit no. detedoratýon of thewability.toegulato pressure do, ýnot have the same prob!e.ms. with the 0-rin
" g,. This.is based boon :the fact that we. have nt received other complaints OfVfailures and the fact :that them failues:that are.the-subject of this.notification ocurre. in a: short amopnt of time, afer installatio.h.
In, addit~on to the correcti.e adtion plan described i.n Attachment A, Dresser:Masoneilarf has developed a estb method :and.accep~tance-citeria..as described: in Attachmet
. inspectio:ns.an: be performed o. i-setrvice R-tegulators. to: determine if. the unt is expeiencing pressure loss due.to:these: described i-ssues. Due to the volmeageand d;5tributi'd.n of thmese models Drse Masnia
'Is iilgthaena tice to. all utilities.
(X81:111-r Masoneilan does not: have, adequatie kniowledge of all the. service applictatiois. to deteri~nie whether failure of these products could create a "*ubstanMiat sýafety ha4zatrd' asý defirned by IOCFR 21.:.3ý hence we subMit this r*o.ificatibn unde the: provi,*
s' of I.OGFH R_;,) 1.2 1.
If:you ha.e::ny.*uetiuns concerning Ci:iflciiiosh.pleas ontact Bill Colneau:at (50a) 941-5477,.
J\\ra:r, Wee".i*gn*"
(;, Ai t
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Ds~ t ~ II f.:k, Avo
Masoneilan 9/29/2010 3:00:08 PM PAGE 4/006 Fax Server Attfaciment A Evb atiow Uipown notific*atieonwe p.it I hold '0n ii
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Uie.tion. Ws hladtelo the;:
Reg u.laors in ouir in*vLo"Yr retreýtec and cla.amloned ý.Intif wvEe.
com*ioted our invfr-'s1igaui1>n. Ae of the 8etlto in oux intiypcd utsiqA hat poiril ni npewsd ~enl~
o wabS found io theý (tflng orhflefief Valve $eat.
10r&
Ili~dt ave theirl stci kretured to~rs Thdnela.i f.r-valuation~
h alonk with a reps. se.tm.ive fotnes ng.*asse:by arid assevbI:utsi It was distcovereiad during INt osesou
- fn that ihý: 0 nwue-a whl ichSeala.'z istthe.
pre'sure chambe.rs c-an beogme t
daomiaged duning The a proeslsy prociss Asrevt e w
of isetirna[ procadures found.
thatfheý 0-ring initestn wiiin ms assoembk-i in
,.setcia~red p.sihn of visiblelo durigthe Trocss The refVore the ming haq e potential t-he 01niaq-ei: by the threiefade s
atain part.
it1 wasr~
alacie t
s hgipe
)ha o
... ain,...at.e.found that the sutpplier of theopo:e.t ieaerngd to a.q ther"BodV' #3.% 0f) bhd otr properly d-burred tb contained the seqkiinreeitsace of the 0-Ring On some" compon.ents. Th..
lresultinge sharp edge can be anothersourc.e of potential dam:age o t 0~rihg.
The ReliefVave.sen-at had indic:ations of daMage that were founidtobe caused by On assembly tachnianue refer-red t0 as::;cdiriii4. Int) this pro cezssthe ýRelief valve point is 8alignled wiith the Relief Valve seatan usig echnialimpact, the: s~eats conform to one another to. provide altight s~aI Our invesitigaion,
,showed that. it m.iisalignment occurred demng:the process the seat would-susti**n damage CauSing the s abt to quickly:de.terorate se.ice.
pe tin af:he.e O
alv h~u inventory....
The Relief Valve seat mnay have contained burrs. Inspcin ofteRle avesasiorinnty indicateod the supplier was: not properly prepared the, seatinig surfa-ce. Approxiately 30% of the-invehotery Corrective actions by Dres~ser Masonteitan :.to date:
Inspection wasladde Cto the-Bodly boroe edgo in our dedicationr plan.
Inspection w1"as adde loth Relief Va.lve sect ii ou r de dication plan1.
- Procedbures ahnd intructions welre updated to ensure thiet the 0-Ring wa sebled such: thrat the tech n ician can aisibly setecmoet and ensure: the. 0-Rling iS not amaged during the assemnbly process..
,:We reviewed the use of the gtechnique. an.d elirnirated the practice from th current pro.e:.
Thet. chnici:n.isno:ir....t::.:.:.t assemble and test the R*
- ..or with::.t..
If thle Regulator does not pas13s thle reurdtesing the3 Regiulator will be. disassembled and the aeiief valv?\\ carnponentG rtiplac'ed unittl-an acceptaobl combilnatoil ptt3sec' tes"t.
The v-,-.isting irventoryv vui iuor to the corre( tlvve actions: above.
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'a m Reli~ef.H~ole Ffgur 3:Fgure-4 Atteptable Uacpal Apply leak deteckn fluid40 the Relief hole:as sh own. Acceptabe bubble. size is shown in Figure 4, The acceptable ieakrate of he. bubblesis. -t.o 3 per secOnd, ULnacceptable. bubble size. is::sjoew* n Figjre. 5 o r: bu b b les -th at forim.at a "ra ite of m or:e "th "an S o b
~mor:ie p er seco nd.
ne p ion e::
ti*-
- Prseond,
- t. Turn the austing screwdcockwise until 20:psi is reachedfor the 77N.4.a-ir sýet or 40:psig is
-re8OcheOJor the U7N40- air set
- 2. C hock -Vith a flow meoter to see thait th am cnupinslssta20sandardwccmin.
I.
B3lock the telie poeb snga ir (Lir' suitable meanis). andl bock all flow.. The outputpressure must not icrease :more than twO opsig in fou.r sqconds.
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