ML20035A970

Responds to Discussing Televised Rept by WSSB-TV (CBS) Re Faulty Equipment Imported from China & Used at Plant.Nrc & Board Continuing to Review Info Re Flange Problem.Info Notice 92-068 Encl

ML20035A970
Person / Time
Site:	Seabrook
Issue date:	03/18/1993
From:	Taylor J NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
To:	Lieberman J SENATE, ENVIRONMENT & PUBLIC WORKS
References
CCS, IEIN-92-68, NUDOCS 9303300296
Download: ML20035A970 (4)

Text

1. p* '* %

E h'e UNITED STATES S.7.,

NUCLE AR REGULATORY COMMISSION i

nasmorcN,o c.rms March 18, 1993 9

41 The Honorable Joseph Liebernan, Chairman

'+*4 Suwrat+co en r ea" 9'r M Van Oegulat ;u Comittee on Environment and Public Works United States Senate Washington, DC 20510

Dear Mr. Chair an:

7 I am responding to your letter of February 15, 1993, in which you referred to a televised report by WSSB-TV (CBS), Hartford, Connecticut, concerning faulty equipment imported from China and useo at the Seabrook Station, Seabrook, New Hampshire.

You also requested a reply that addressed our analysis of this issue and its effects en all U.S. Nuclear Roulatory Cemission (NRC) licensees, our coordination of this issue with other Federal and State agencies, other NRC licensees that reported having flanges that could be substandard, and the steps we are taking to address any safety issues.

On December 7, 1992, Mr. Cole of WSSB-TV contacted the NRC and inquired about the NRC's acticns regarding China flanges at the Seabrook Station.

Mr. Cole was provided a verbal overview of the NRC's actions regarding the flange issue, as well as specifics on NRC fellcw-up activities at Seabrook.

On September 10, 1992, the NEC issued Information Notice (IN) 92-68,

• Potentially Substandard S'ip-On, Velding Neck, and Blind Flanges * (copy enclosed), to all power reactor licensees, with copies provided to all non-power reactor licensees, agreement states, and major vendors supplying the nuclear industry.

Additional NRC licensees will be notified of the flange problem if it is found to be aprrepriate during the course of our ongoing review.

The IN alerted recipients to problems that could result from substandard flanges teported from the People's Republic of China and enclosed an analysis of this issue.

Power reactor licensees use the largest number of flanged assemblies in applications with the greatest safety significanct this IN, iht 'nRC stated that the National Board of Boiler and Pressure vessclIn 3

nspetters (Beard) of Columbus, Ohio, received numerous reports of flanges tarked ' China' that containeo cracks, inclusions, and slugged weld repairs and that were constructed from two pieces of material.

The suspect flanges were marked as stael forgings that comply with the American Society for Testing and Materials (ASTM) Standard A-105, ' Specifications for forgings, Carbon Steel, for Piping Components,* and the American National Standards Institute (ANSI) Standard 816.5, " Dimensional Standards for Steel Pipe Flanges and Flanged fittings."

When the 1N was issued, the NEC did not have evidence that any suspect China flanges had been installed in U.S. nuclear pc er plants.

However, since that IN was issued, the licensees listed in the enclosure have verbally advised the NRC of finding suspect China flanges in uninstalled piping assemblies for use in planned mocifications or installed in nonsafety systems.

Because lhs do 9303300296 930318 PDR ADOCK 05000443 n 11 U

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E Letter to Senator Lieberman dated P. arch 18, 1993 Distribution:

i Jiaylor JSniezek Hlhompson JBlaha JKnubel I

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(Kamerer TIMartin, RI CERossi RZimerman SECY OCA TMurley l

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t Senator Lieberman t- !'

i not require licensees to take specific action or respond in writing, this list may not bound the extent of the problem but our inspection experience has been that licensees take the actions necessary to address the safety issue.

Properly implemented, NRC-required, Quality assurance programs should minimize the possibility that licensees have installed China flanges in safety systems.

i Only the licensee for the Seabrook Station reported finding flanges in a 3

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4 t h C d e g..... fl.:.g e i o.

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t ventilation) that could be substandard because they were stamped

• China.'

The licensee performed insitu evaluations of the flanges installed at the Seabrook Station to assess their quality, their safety function in a ventilation system. integrity, and ability to perform The licensee determined that the China flanges were acceptable for this particular installation.

4 The licensee's actions have not identified China flanges installed in any other sa fety system.

As documented in NRC Inspection Report 50-443/92-25, the NRC resident inspector determined that the licensee was taking sufficient actions 1

to address the issue, including the inspection of about 20 China flanges installed in nonsafety systems.

final results of the licensee action plan upon completion.The resident inspector wi i

During a meeting on August 19, 1992, of the Interagency Vorking Group for l

Problem Parts and Suppliers, the NRC's representative discussed the issue of flanges marked " China" that could be substandard.

6 lH 92-6B was issued through the Government-Industry Data Exchange Program (GIDEP) to its members in Agency Action Notice AAN-ll-92-Il5, September 24, 1992.

The Board, through its 1992 5pecial Edition of the Bulletin, i

Volume 48, Number 2, alerted its membership (state jurisdictional officials) and Bulletin subscribers of the results of j

its investigation of flanges marked " China.*

i t

The HEC and the Boare are ccntinuing to review information related to the

[

flange problem.

Further inspections are also planned to assess licensee and i

ver. dor actions associated with this issue.

work on a similar problem recently found by the federal Trade Cornission inIn additio

~

which stainless steel flanges and butt-welded pipe fittings imported from Taiwan could be substandard.

The NRC will continue to provide the industry 4

information on substandard parts, including an update to IN 92-EB, if l

appropriate.

}

Sincerely,

)

j Griginst signed by

~

Jaw V IEylof f

[

James M. Taylor Executive Director

]

for Operations l

Enclosures:

l 1.

NRC Licensees Reporting China Flar.ges 1

4 2.

Inforration Notice 92-65

{

cc: Senator Alan K.

Stepson i

• Distribution and concurrence see next page I

. ~ __ _ _ _

~ ~ -

f

l ENCLOSURE 1 s

NRC LICENSEES REPORTING CHINA FLANGES i

f 1.

Virginia Electric and Power Co. (North Anna Power h

Station /Surry Power Station) 2.

Wolf Creek Nuclear Operating Corp. (Wolf Creek Generating Station) 3.

Pennsylvania Power & Light Co. (Susquehanna Steam Electric Station) 4.

Arizona Public Service Co. (Palo Verde) i 5.

Southern California Edison Co. (San Onofre Nuclear Generating Station) 6.

Ceaha Public' Power District (Fort Calhoun Station) i 7.

Pacific Gas & Electric Co. (Diablo Canyon Nuclear Power Plant)

B.

Texas Utilities Electric Co. (Comanche Peak Steam Electric Station) i i

9.

Houston Lighting & Power Co. (South Texas Project) l 10.

North Atlantic Energy Service Corp. (Seabrook Station) s o

1 9

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ENCLO5URE :

UNITED STATES NUCLEAR REGULATORY COMMISSION OfflCE OF $1UCLEAR REACTOR REGULATION i

WASHINGTON, D.C. 20555 l

September 10, 1992 NRC INFORMATION NOTICE 92-68: POTENTIALLY SUSSTANDARD SLIP-ON, WELDING NECK I

AND BLIND FLANGES s'

t B

fdcressees All holders cf operating licenses or construction permits for nuclear powe reactors.

r i

Purrese

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The U.S. Naclear Regulatory Commission (NRC) is issuing this information welcing neck, and blind flanges. notice to alert licensees to problems with po; this information for applicability to theirIt is expected that recipients will review I

facilities and consider actions, as appropriate, to avoid similar problems.

this information notice are not NRC requirements; thereforeHowever, suggestions co j

action or written response is required.

, no specific Descrirtien of Circumstances of Boiler and Pressure Vessel Inspectors (Board) to disc People's Republic of China. investigation of problems associated with flanges that orig flanges marked " China

• The Board has received numerous reports of repairs, and that were constructed from two pieces of materizl.that conta

{

The suspect China flanges were sold to U.S. suppliers through several tradi companies.

Three of the trading companies identified were:

Company Limited of Hong Kong, Tain Gong Company, and Shanxi Province Overse Billiongold Trading Corporation.

The suspect flanges were marked as forgings that complied with the requirements of the American Society for Testing and Materials (ASTM) Standard A-105, " Specification for Forgings, Carbon Steel 4

Standard B16.5, " Dimensional Standards for Steel Pipe j

Fittings.*

welded to the inside diameter of the flange and the outer surface i

i machined.

melding or the two-piece construction. Consequently, a visual inspection would no weld repairs to the flange hub and still others failed to meet the materialOther specification requirements for thermal treatment, mechanical properties, or chemistry, i

i

-9?c99?ottt-i e.i

i j

i IN 92-68 i

September 10, 1992 i

Page 2 of 2 I

i t

OlsCus5109 l

The Ecard determined that one Chinese flange manufacturer, of the several known factories that supply the U.S., shipped r. ore than 110 tons of j

('w :. Int tNS) E16 rhina fl ancas t o this country.

The Board stated that over 7,000 f l anges are being r ec.v.ea t ren. ret int ries as,J pelv u tr.cn.it..

p.,, t >

as a result of failures that occurred during welding, bolting, and hydrostatic l

j and pre-crerational testing.

The Virginia Electric and Power Company infermed HEC staff inat China flanges are installed in two of its fossil power plants t

j and ethers are in its warehouse. At the time of discussion, Virginia Po.er nad not cetermined whether any suspect China flanges are installed in its nuclear pc-er plants.

i l

The NRC does not have esidence that any suspect China flanges have been

)

n. stalled in U.S. nuclear pc.er plants. Ho.ever, specif c examples and i

discussicns of ine problems are attached for information.

1 l

A potentially substandard ' China

• flange can pass between two or more I

ctstritutors before reathing the er.d-user facility.

A nuclear power plant

}

cculd buy a cor.mercial grade China flange from a distributor to dedicate the i

flange for safety-related use, er safety-related components or subassemblies i

that contain China flanges could be supplied by licensee-approved 5

manufacturers or fabricaters.

Establishing and verifying procedures to trace i

procured equipment and material to the original manufacturer or mill is an important prerequisite to inspecting and testing during the deditation process.

It is pcssible for a licensee to install potentially substandard cr defective e0uipment or material if it does not adequately verify that the product can te traced to the original manufacturer.

3 l

This informatten notice requires no specific action or written respense.

If

{

you have any questions accut this matter, please contact the technical contact listed telc., cne of the Ecard representatives listed on the attachments, or l

ine apprcpriate Naclear Reactor Regulation (NRR) project manager.

j Q :l e s f. Ro,1 [-m

.6-Char ssi. Director Divisicn of Operational Events Assessment Office of Nuclear Reactor Regulation 4

i tecnnical ccriact-Steven M. Hatir.c.

NRR

)

(301) 504-2191

3tt ents:

1 1992 EoBrd article. "failLre ar,alysis Gf a $11p-On flange.'

i 2.

Selected 1992 E: arc ' HEE!n'eletterr (15! of Eecently Issued hk[ jnformat;;n Nctices i

j 1

1 i

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j Attachnent 1 IN 92-6B Septe.v.ber 10, 1992 Page 1 of 3 The installation ofa 14 ~ slip-on fange in a pipc.'lne tras rectn!!y ua 7 teilnessed by AlJustin. chief

'y*i..= 4 y

inspectorfor the 5 talc ofMinne-l

( f *,*, J ' 3 ?.A

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• sola. Thepange originally hada f

a 14 3/4~ inside diameter, tchich y;

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tvas reduced by tv-iding a 3/4 ~

4 [,,L,, Y ring and machine toelding. The

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ring, however, separatedfrom the y'

pl 9q pange.giving the appearance ofa crack. Thepangeis reported to 7

A N A LY S l S have been manufactured in the People's Rep OF A S Ll P-ON_

severai suchpange, have been reportedin theficid. siiins i"d"s"? sho"!d be on 'h'10' 'hes'9a"8es-FLANGE Thelo!!cwins is a report by cohimbus Meta!!ursicai servic failure analysis ofa slip-onflange.

t A "cTacked" 14~ diameter slip-on dange was non desvuttis cly i

magnene particle, dye per.stant and ultrasonic tes' methods. The Dang u

l checked for materialchemical ac lysis and mactr,and microstruct the results and obscavahons reported. *he follrwing conclusion is draw ~

n:

The subyct shp.on 04nge is not an integral forging or a casung fabncated by welding and machining a ring insen within a large dange. The dange cracked" because the welds between the ir. sert were inadequate to withstand the botting pressures.

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BACKGROUND

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The ~ctacked" slip-on dange w as recen ed by Columbus Meul

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Services. Inc. in one piece it had two diametncally oppoute crach

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located on pipe and gasket sides it has twn reported that rwl such Oanges are in the field. The sveiect Dange has the to!LwN

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f;,.gt,. N, engras ed markings on the outside diameter (OD) i s.*.

N-42,

[ $,'h*'\\.,.

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~14 XO SO RF B16 $ A105 648 CHINA 02f" s

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To idennfy the cause of the failure it was planned in perter.* e i

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F.gse 2 A ccse.gp Cf the penetrant, dry magnene particle. uttrasonic and raJegra; N n. -

b' posne$ s,ce swo eg t*.e

' crow ano.c onon

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AtIachment 1 IN 92-68 Septer.ber 10,199:

Page 2 of 3 t

k NON DESTRUCTIVE TESTS

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'l First. the Dange w as L'T tested from the t

og a

e OD The mdications wcre rather W-puzzling be<a uw the reCertions w cre k~*.

consistcrulv from a cylmdrical surface l

about 3 75'from the OD A dry mag-

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i netic particle caammation conhrmed L

that the cracks entended more or less I

contmuous!) in a circular Fath The

'Ig, #

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g ",p, M ^" ~ ~

4, 4,

l NDT cismmation was concluded with x

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e dye penetrant tests as shown m the phote. graphs in Figures 1 through 4 It F93* 3 Poe s,oe of c.onge w as quae endent that the Dange was

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not a smgle piece component A large mside diameter (ID: flange was reduced to a 14' ID unit by w c!dmg a 0 75 thick nng The w eldmg faces had been machmed

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CHEutcAL ANALYSES AND METAttc>cR Apsy The Cange w as sectioned mio four pieces to obram specimens for chemnen as w for rr. acro and microscopic c ammanon The ongnal engras ed markegs has e been.

retamed on ene of the segments The chemical analyses are as follow s 3

i C

Mn P

S Si Cu Sn Ni Cr Mo Al

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Mam Range Steel i

23

.62 2:4 IM 24 27 416 M4 CW I:6 Ke 003 Welded Irurt Steel 26 1 02 r17 0 39 25 I63 m3 S50 CA C3 COF- 00 ANSI / ASTM A 105 i

35 abC 1 CS I40 050 3!

Omed for reference ords ;

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J s '., L w a $1 s

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At tac! rent 1 IN 92-66 Septer.ber 10, 199:

Page 3 of 3 l

Figurt 5 shows the radial macro secnon

g. r ppy g,-3,rg

^3T. a p' N, d'y,4.?

of the Dange Note the ansert nng e

4.-? 6, W.1: Y,', ?.%'

M*)

welded to the masn nange. When k

another simstar piece was further sec.

, Q ' ij.;,,, *;5, h_; l',",,

noned to retries e specimens for

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, f.g.;,

QY)U g?),*;y.f4 p mounnng and polishing. the insert

• g.tT;j.'*,Jj g,. gi',*p' ;y:.,

g:.g '4 Separared from the main Dange The

,r S.w'-1[kpg, j.

general meerostructure Iferntic pearlitic)

,J; of.

Mi-p - 0;s..,,

.I

,{,$*J;i,t', ;

at 15X (Nital etch) is shown in Figure 6.

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., yy YI.e.yM T$*':!5(*:p

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Vf A-!.y ql,}

Roc <wELL HARDNESS TEST

$75WM.fe s

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'k$~L""MO Main Flange:

R69.70 HRB As e.

F.gure o pnctosrc,,ng gone,oi 70 HRB m<res"uctute n tr.e m..n tonge oe.er Inse rt:

76.75.50 HRB As e =

P OO ese" (uCC er ho4 onc * **c me'o: : e 9 r

75HRB ec;;e) 25x.N.to: sten i

No funber *ork was deemed necessarp i

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f 9

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Attach ent 2 IN 92-68 September 10,199:

Page 1 of 4 C-

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Alert Continues for Flanges from China m Winter 1992 NatienalBed BJ!rtin included an article reguding a serious quired by the ANSI B16 specificanon, problem found to exist on 14* sifp-on.

although they do bear the B16 rnark_

raised face fianges.

NBBl advises double-checkjng a]! Ila nges Since publication,NBBIhas teamed tk with the markJng

• China." espec: ally problem descnbed is only one of rnany before these bnges are p!4ced m scruce.

assoested with flanges from the Peoples Certainly, flanges that ha ve wsible surface Republic cf China, discontinuities or incomplete markings NBB! has been prodded with a lab report rnay be easy to see. But the rnachined for a 4 weld neck flange SA 105N B16-5 surfaces of welded flanges can orJy be with a BHN (Brinell Hardness Number 1 of detected through a volumetne ferm of up to 500. AJu, rcrmaliting and chemis-NDE. The fallure to meet ka t trea t, try requirements do ret rneet SA 105 rnechanical or chemical requirements cf s

requirements.

the specifications can only be venfied through metallurpe eurnination, hse flanges ha ve been reported to have i

]

cracks and other surface dacentmuines This update is being distributed in the tha t rrught male them un!it for sernet. In interest of public safety. Future updares a ddition. there ! ve been reports tha t will be published as more laets areleamed.

1 scrr.e flanges do i i rneet thickness requirements. NBBI also has been ad vised Further questions or concems should de through erinspection reports that mme directed to A.M. " Doc' Ma nhe ws Jr. er bnges rnay not bear the markings re-R.D. Schueler, Jr. a t Na tional Bea rd hea d.

r quarters.

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At t a r_,5ent 2 IS 91-6B September 10, 1992 Page 2 of 4 NB B1dle. civetv-r i - suua a tv - sei<s2 I

Number of Suspect Flanges Growing at Alarming Rate The Na tiona) Board continues to receive reports of severa) different types of inspections }chn Mcl.ouglin, la te ir. May Ranges, ranging in sizes from 2

• to 20" in Be}ing to discrts the problern.

and marked 'O.ina." that do not appear to bein accordance with ANSI B16 as NBBl continues to ad use double-checking rnarkings.

all flanges with the marking

• China,"

especally before these flanges are placed in service, As the number of suspect Ranges contin-ues to grow, so does the different types of Ranges that have visible surface problems related to these Canges discontinuities or incomplete markings To date, over 7,000 ha ve been renoved may be easy to 5-e. But the machined surfaces of welded nanges can crJy be from semce. incJuding 1,6CO recently dncovered in a newly-insulied pipeline.

detected through a volarnetne ferrn of An injuncnon has been crdered to cease NDE. The failure to meet heat tres t, work on the pipeline untJ the Range med.a nical or chemical requiremer.ts of problem has been resolvet The remr.in-the spedfica tions can only be wnhed ing 5.20% flanges have been found through metallurgse examtnanort mostly in refmenes.

I NBBl will continue to publish upda tes as The president of the China Association of informa tion is learred. This update is Boiler and Pressure Vesse] inspetoon, distnbuted in the interest of pubhc ufery.

Center of Boiler & Pressure Vesselinspec-Further questions or concerns should be

.,on ic Research of the MtrJstry of Labour, PAC., Wang Hannuo. has a gned to meet directed to A.M. D:>c" Ma tthews.Jr. or R.D. Schueler,)r at Na tional brd mth Na conal Board Asustant Director ofteadquarters.D i

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Sep t e.r.ber 10. 1992

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Ju=r im Flange Update: McLoughlin Meets Chinese t

Boiler / Pressure Vessel Officials John D. McLcmghlin, aasistant director of hrpections,rnet with several a geroes of the Met.cughlin by Mr. Su Rung ji, v of Chie.a. Mr. Mel.cughlin tret with Mr.

Chinese goverrenent during his recent visit to the Peoples Republic of CMna. The visit Zheng You Mei, director of the Re wa : to discuss pro blems with fla nges ma nu.

Bureau, State Comc2, P.R.C., Ms. Tan Jia factured in China (and dismbuted b the Niars assistant direc1er of the Reerption US.h resu, and several members of the Center of Bouer arsd Pressure Vessel Inapection aid Research (representing the Min.is:ry of La.

Two meetings were held in Beijing.

bor). C3PVIR has been auistng the Na-tional Bcard in its Investiption.

C5 May 211992, McLoughlin met with officials of the Center of BoUer ard Pressure t

Vessel inspec. on and Aesearch, as we!! as The director of the Reception Bureau i given ceptes ofinforma tion acrumula ted dur-representatives of Shanxi %ince Over-tng the coune of Mr.McLoughlin's investi-uu Tra din g Corpo rs rion.Tian Cey Com-ga tien a nd provided with a bnef pany and CLa.r Xir. ant Nan X.i U nar.ge of the docurnents ard the sign 1&2

Company, each.

Mr. McLoughlin learned that IXng Xinang I

Ns.n Xi Li has shipped seven to eight con-Mr. Zheng You Mei repented th Rung J; has a grrst interest in sne f.ange tair.crs (each with 17 sons of wrious types situation. He said the govemmen i

ard sizes of flanges) to the US. thmugh sted the information provided by the N whatisbelieved tobelachonvme DnMa S hipping was reportedly provided by Sha nxi tiona15c.ard. Mr.Zheng Yeu Me that a ecmplete repert of the meeting would Provsnce, Tian Cong ard Ei!!iongeld (a be provided ) Mr.Su Rung Ji.

Hong Kong trader with Beijing of!ic-s).

Mr. Yang U Min of Shanxi Province C%r-The meeting conclw ded after Mr. Mc L~a provided Mr.Zheng You Mes mth tr:om-seu Tra ding Corporation reported tha t the base rnatenal for these fianges wu 25 MN mendatiens en strps the government coul tale to assure that steel trdits and forging a nd possibly 16 MN (both Chinese forging malers produce rnaterial and f.anges tha spectications) and not the A105 identfied rneer ASTM ard AN5! rpecfi:2nora. The e n both the f.a nges a nd rna tenal tesi reports. NanonaJ Bc.ard wi!! be advised when or if It wu sta ted by Mr. Yang U Min that rntnu-these recommenda tions wi: be irnpe facturing identification en the fianges wa: Upon his rerum to the US., Mr. McLeugh specfied by Eilliengold (the Hong Kong rectived the labora toryresvits el bhrd e.a ender) ard not the flange rnanufacturer.

and slip on flange tests that wert orderrd prior to his departure. Results of these tescs A secord rnetting wu arranged for Mr. are as follows:

i

h Atta: Ment 2 IN 92-68 September 10, 1992 i

Page 4 of -

N B Bidf.:::ci vewu r i uuk e r s t e

.,v

ins:

T'aages enthwl 1.B!md Cange with anIdentier of 77 aM ma: Led A1C6 s repened to be a phte mate-1 na!.

2.Sbp en thage with an identife of USC er USIO a.nd a but #14A contains absged weld repairs. The W we3d repair indicator regaired by A105 is not sta.:: ped on the Cange. The cAc:Gtry does act zwt A105.

j

-l The mill report does tot indicate any type of J

1 but trast even though the Car.gr k marked Zh AICfN a.nd hAs aho been "wid repased.*

rmsy, p>ot:, -acrographs ucate put,

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matcriel The ihnge ma.kers name b Shou Ol'." "'

Cang Machinery Er gineering Cetrpasy.

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Ac:=rding 1o Mr.Melmghlir. This Cf$ce b

N

~7 D The Naneral k.a.rd of kMn aid Prena.n hu probably ac:=mphshed allit cza at this y,,,,3 g,,,p,e,,,, 953 g,y 7p, g,,,,

po nt, mth the res.:nece avaihbie. The NA, % c,(61o m NatenA! Board m3 yabhsh a sped edition i

cf The Nstesa! Roerd Buffrth that w!!! ad-p.}. Mhg i

dress this proble:n Mepc'd, we will be Ez n e m D m rse-f

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alle to report :teps the Chir.ese governme-J AM,*DW Ma tuwws, Jr, a.it taking to inrare that ther Langt prod.

AsnsW Esnew h t

ucu meet sp?clatior."

F D I N^^^^ M I

pnets ef C-w6cm Na w The Natier.tl Beard mD be previtang vari-C[

g ous appreprate age-c.es of the U.S gevem-mer.t mth informatten it has acquired l

thieugh the investgsten procas.']

I i

i 1

9 Y

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enape.qug

• 6,-.

r; IN 92-6B September 10, 1992 Page 1 of 1 LIST OF RECENTLY ISSUED NRC INFORMATION NOTICES t

Ir. formation Date of Nctice No.

Subject issuance Issued to 92-67 Deficiency in Design 09/10/92 All holders of Ols or cps I

Modifications to Ad-dress failures of for nuclear power reactors.

Hiller Actuators Upon A Gracual Loss of Air Pressure 92-55 Access Denied to NRC 09/01/92 All holders of OLs or cps Inspectors at Five Star i

Products, Inc. and for nuclear power reactors Construction Products and all recipients of Research, Fairfield, NUREG-0040, " Licensee, Con.

Connecticut tractor and Vendor inspec-tion Status Report" (White Book).

j S2-55 Safety System Problems 09/03/92 All holders of Ots or cps l

Caused by Modifications That Were Not Adequately for nuclear power reactors.

^;

Reviewed and Tested t

92-64 Nozzle Ring Settings 08/28/92 All holders of Ols or cps on Low Pressure Water-Relief Valves for nuclear power reactors.

52-53 i

Cracked insulators in 08/26/92 All holders of Ols or cps ASL Ory Type Transformers Manufactured by Vesting-for nuclear power reactors

+

house Electric Corporation 92-52 Emergency Response 08/24/92 Infcrmation Require-All U.S. Nuclear Regulatory ments for Radioactive Commission licensees.

i Material Shipments t

92-51 Loss of High Head 08/20/92 All holders of Ols or cps i

Safety injection for nuclear power reactors.

92-50 Valve Stem Failure 08/20/92 All holders of Ots er cps Caused by Embrittlement for pressurized water reactors (PWRs).

OL Operating License CP Construction Permit

~~

. -...,