ML20035A971

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

ML20035A971
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
Shared Package
ML20035A972	List: ML20035A971 ML20035C515 ML20035C520
References
IEIN-92-068, NUDOCS 9303300296
Download: ML20035A971 (4)

Text

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UNITED STATES

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WASHINGTON, D. C. 20555 h

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March 18, 1993 The Honorable Joseph Licberman, Chairman Subcommittee on Clean Air and Nuclear Regulation Committee on Environment and Public Works United States Senate Washington, DC 20510

Dear Mr. Chairman:

I am responding to your letter of February 16, 1993, in which you referred to a televised report by WSSB-TV (CBS), Hartford, Connecticut, concerning faulty equipment imported from China and used at the Seabrook Station, Seabrook, New Hampshire. You also requested a reply that addressed our analysis of this issue and its effects on all U.S. Nuclear Regulatory Commission (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 actions regarding China flanges at tne Seabrook Station. Mr. Cole was provided a verbal overview of the NRC's actions regarding the flange issue, as well as specifics on NRC follow-up activities at Seabrook.

On September 10, 1992, the NRC issued Information Notice (IN) 92-68, "Potentially Substandard Slip-On, We16ing 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 appropriate during the course of our ongoing review.

The IN alerted recipients to problems that could result from substandard flanges imported 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 significance.

In this IN, the NRC stated that the National Board of Boiler and Pressure Vessel Inspectors (Board) of Columbus, Ohio, received numerous reports of flanges marked " China" that contained cracks, inclusions, and slugged weld repairs, and that were constructed from two pieces of material. The suspect flanges were marked as steel 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 B16.5, " Dimensional Standards for Steel Pipe Flanges and Flanged Fittings."

When the IN was issued, the NRC did not have evidence that any suspect China flanges had been installed in U.S. nuclear power 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 e

in planned modificatiord or installed in nonsafety systems.

Because ins do l

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Senator Lieberman 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.

Only the licensee for the Seabrook Station reported finding flanges in a safety system (six 4-inch welding neck flanges installed in the control room 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, integrity, and ability to perform their safety function in a ventilation system.

The licensee determined that the China flanges were acceptable for this particular installation.

The licensee's actions have not identified China flanges installed in any other safety system. As documented in NRC Inspection Report 50-443/92-25, the NRC resident inspector determined that the licensee was taking sufficient actions to address the issue, including the inspection of about 20 China flanges installed in nonsafety systems.

The resident inspector wili be reviewing the final results of the licensee action plan upon completion.

During a meeting on August 19, 1992, of the Interagency W rking Group for Problem Parts and Suppliers, the NRC's representative discussed the issue of flanges marked " China" that could be substandard.

IN 92-68 was issued through the Government-Industry Data Exchange Program (GIDEP) to its members in Agency Action Notice AAN-U-92-115, September 24, 199?. The Board, through its 1992 Special Edition of the Bulletin, Volume 48, Number 2, alerted its membership (state jurisdictional officials) and Bulletin subscribers of the results of its investigation of flanges marked " China."

The NRC and the Board are continuing to review information related to the flange problem.

Further inspections are also planned to assess licensee and vendor actions associated with this issue.

In addition, the NRC is starting work on a similar problem recently found by the Federal Trade Commission in which stainless steel flanges and butt-welded pipe fittings imported from Taiwan could be substandard. The NRC will continue to provide the industry information on substandard parts, including an update to IN 92-68, if appropriate.

Sincerely, original signed by Jarns M. Taybt James M. Taylor Executive Director for Operations

Enclosures:

1.

NRC Licensees Reporting China Flanges 2.

Information Notice 92-68 cc: Senator Alan K. Simpson

• Distribution and concurrence see next page

Letter to Senator Lieberman dated March 18, 1993 Distribution:

JTaylor JSniezek HThompson JBlaha JKnubel HDenton

+

JScinto CKammerer TTMartin, RI CERossi RZimmerman SECY OCA TMurley FMiraglia WRussell JPartlow g 'rf AGody, Sr.

DMCrutchfield

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NRR Mailroom (Green Ticket No. 0008598) o#ge,J Central Files (w/ incoming)

NRC PDR (w/ incoming)

PDR(w/ incoming).1p/[s(([J

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EDO R/F 0008598 3

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Tech Editor's comments have been incorporated 5#

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DATE 03/01/93 03/01/93 03/07/93 03/0hh 03/4 /93 h

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COPY YES N0 N0 491W VJ 0FFICE D:DRIL ADT:NRR DD:NRR A 4 p:NRR/fg EDO NAME C[R6 bib WRussell/ k FMira k N /

( f7Mu M JSniezek DATE 03/l/-/93 03/k/93 03/[/93

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YES N0 3 COPY

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NAME JBlaha JTayk Ok[

3/)k 3/kd[93 DATE 3/ /93 COPY YES NO YES NO YES NO YES NO YES NO OFFICE RECORD COPY DOCUMENT NAME:GT 8598

o ENCLOSURE 1 NRC LICENSEES REPORTING l

CHINA FLANGES i

l 1.

Virginia Electric and Power Co. (North Anna Power.

Station /Surry Power Station) 2.

Wolf Creek Nuclear Operating Corp. (Wolf Creek Generating I

Station) l 3.

Pennsylvania Power & Light Co. (Susquehanna Steam Electric l

Station) 4.

Arizona Public Service Co. (Palo Verde) 5.

Southern California Edison Co. (San Onofre Nuclear

]

l Generating Station) i i

6.

Omaha Public Power District (Fort Calhoun Station) 1 7

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

l 8.

Texas Utilities Electric Co. (Comanche Peak Steam Electric l

Station) 9.

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

North Atlantic Energy Service Corp. (Seabrook Station) i i

I

(

]

ENCLOSURE 2-UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION WASHINGTON, D.C. 20555 September 10, 1992 NRC INFORMATION NOTICE 92-68:

POTENTIALLY SUBSTANDARD SLIP-0N, WELDING NECK, AND BLIND FLANGES Addressees All holders of operating licenses or construction permits. for nuclear power reactors.

Purpose The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice to alert licensees to problems with potentially substandard. slip-on, welding neck, and blind flanges.

It is expected that recipients will review this information for applicability to their facilities and consider actions, as appropriate, to avoid similar problems.

However, suggestions contained in this information notice are not NRC requirements; therefore, no specific action or written response is required.

Descriotion of Circumstances On July 9,1992, the NRC staff met with a representative of The National Board of Boiler and Pressure Vessel Inspectors (Board) to discuss the Board's investigation of problems associated with flanges that originated from the People's Republic of China.

The Board has received numerous reports of flanges marked " China" that contain cracks, inclusions, and slugged weld repairs, and that were constructed from two pieces of material.

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

Three of the trading companies identified were:

Billiongold Company Limited of Hong Kong, Tain Gong Company, and Shanxi Province Overseas 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, for Piping Components," and the American National Standards Institute (ANSI)

Standard B16.5, " Dimensional Standards for Steel Pipe Flanges and Flanged Fittings." However, the suspect flanges were manufactured with ring-inserts welded to the inside-diameter of the flange and the outer surfaces were machined.

Consequently, a visual inspection would not detect either the welding or the two-piece construction. Other flanges were found with slugged weld repairs to the flange hub and still others failed to meet the material specification requirements for thermal treatment, mechanical properties, or chemistry.

0?O9930H4 ---

4 IN 92-68 September 10, 1992 Page 2 of 2 Discussion The Board determined that one Chinese flange manufacturer, of the several known factories that supply the U.S., shipped more than 110 tons of ASTM A-105, ANSI B16, China flanges to this country.

The Board stated that over 7,000 flanges are being removed from refineries and petro-chemical plants as a result of failures that occurred during welding, bolting, and hydrostatic and pre-operational testing.

The Virginia Electric and Power Company informed NRC staff that China flanges are installed in two of its fossil power plants and others are in its warehouse.

At the time of discussion, Virginia Power l

had not determined whether any suspect China flanges are installed in its nuclear power plants.

The NRC does not have evidence that any suspect China flanges have been installed in U.S. nuclear power plants.

However, specific examples and discussions of the problems are attached for information.

A potentially substandard " China" flange can pass between two or more distributors before reaching the end-user facility.

A nuclear power plant could buy a commercial grade China flange from a distributor to dedicate the flange for safety-related use, or safety-related components or subassemblies that contain China flanges could be supplied by licensee-approved manufacturers or fabricators.

Establishing and verifying procedures to. trace procured equipment and material to the original manufacturer or mill is an important prerequisite to inspecting and testing during the dedication process.

It is possible for a licensee to install potentially substandard or defective equipment or material-if it does not adequately verify that the -

product can be traced to the original manufacturer.

This information notice requires no specific action or written response.

If you have any questions about this matter, please contact the technical contact listed below, one of the Board representatives listed on the attachments, or the appropriate Nuclear Reactor Regulation (NRR) project manager.

(CharlesI.s_R.l Director br.d 7M7

Rossi, Division of Operational Events Assessment Office of Nuclear Reactor Regulation Technical contact:

Steven M. Matthews, NRR (301) 504-3191 i

i Attachments.

I 1.

1992 Board article, " Failure Analysis of a Slip-On Flange."

2.

Selected 1992 Board "NBBinfoletters."

3.

List of Recently Issued NRC Information Notices l

1 l

l i

IN 92-68 September 10, 1992 Page 1 of 3 The installation ofa 14" slip-on pange in a pipeline was recently 3

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toitnessed by AlJustin, chief inspectorfor Ihe State ofMinne-( b", (" '. )j

..a sota. Theflange originally had a f

i 5,, I 14-3/4" inside diameter, tchich y'

'b [,L.Y, Y tuas reduced by welding a 3/4" ring and machine welding. The

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y; ring, however, separatedfrom Ihe FAlLURE 9""E E'"'"E "* "PPearance of a g?

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crack. Thepange is reported to A N A LYS i S have been manufactured in the People's Republic of China.

OF A several suchpanges have been reported in thefield. Allindividuais in the SLlP-ON

!"d"s? sho"!d be 0" 'he a"for Ihesepanges.

FLANGE Thefollowing is a report by columbus uetailurgical services. Inc. on the failure analysis of a slip-onflange.

A " cracked" 14" diameter slip-on flange was non-destructively inspected by usmg magnetic particle, dye penetrant and ultrasonic test methods. De Gange w as also checked for material chemical analysis and macro and microstructure. On the basis of the results and observations reported, the following conclusion is drawn: '

The subject slip-on flange is not an integral forging or a casting. It has been fabncated by welding and machining a ring insert within a large diameter flange. The flange " cracked" because the welds between the flange and th insert were inadequate to withstand the bolting pressures.

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". f The " cracked" slip-on flange was received by Columbus Metallurgical

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k Services,Inc. in one piece. It had two diametrically opposite eracks

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a located on pipe and gasket sides. It has been reported that -es eral such flanges are in the field. The subject flange has the follow mg

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engrased markings on the outside diameter (OD):

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s, "14 300 50 RF B16.5 A105 S48 CHINA 02F"

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To identify the cause of the failure it was planned to perform Jt e h.

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^--E penetrant, dry magnetic particle, ultrasonic and radiographic te s en Fig,re 2 A close-uo of the the subject flange, gosset sice showing the

'C'Oc k' inciC Of son.

4 IS 92-68 i

September 10, 1992 Page 2 of 3 l

I NON-DESTRUCTIVE TESTS te. W~e -

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First. the flange was UT tested from the

,D OD. The indications were rather k ~

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puzzimg because the reflections w ere consistentiv from a cylindrical surface I

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I about 375 from the'OD. A dry mag-k:.

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netic particle examination confirmed that the cracks extended more or less X

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,, 8,m.,;, # V continuously in a circular path. The 5

f NDT examination was concluded with Dx t dye penetrant tests as shown in the

'

• MW' Z" photographs in Figures 1 through 4. It Figure 3: Poe sce et fonge.

was quite evident that the flange was not a single piece component. A large inside diameter (ID) flange was reduced to a 14~

l ID unit by welding a 015" thick ring. The welding faces had been machmed.

CHEMICAL ANALYSES AND METALLOGRAPHY l

t The flange was sectioned into four pieces to obtain specimens for chemistry, as well as

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for macro and microscopic examination. The original engrated markings has e been retained on one of the segments. The chemical analyses are as follows:

e C

Mn P

S Si Cu Sn Ni Cr Mo Al V

i Mam Flange Steel

.23

.62

.024

.038

.24

.27

.016

.094

.079

.026

.006 003 Welded Irisert Steel i

.26 1.02

.017

.039

.2S

.063

.003

.050

.0+6

.032

.005

.000 ANSI / ASTM A 105 l

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.601.05 NO

.050 35 (hsted for reference only)

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the poe l#

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section eene snew,ng gr.z n-ene w

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IN 92-68 September 10, 1992 Page 3 of 3 Figure 5 shows the radial macro section

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m.

g("g,, y. TR. f42

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< 8%-

of the flange. Note the insert ring M,,,; g:#f.!, ~

welded to the main flange. When z g;g 4-3 p.x;3 A. g?

another similar piece was further sec-3-

noned to retrieve specimens for

. Lt. T g't.I a J,.;,

Wd* * 'c th*[kh My'( "'g, gcV.(;. c.

mounnng and polishing, the insert 12 gj

-9.y*cg.,.4 separated from the main flange. The g,g;41 general microstructure (ferritic-pearlitic)

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1 li ic 'v at 25X (Nital ete:4) is shown in Figure 6.

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ROCKWELL HARDNESS TEST

..,9 Main Flange:

72.69,70 HRB Ave =

F Q ure 6: Photo snowing general 70 HRB microstructure 4n tne mo:n ftonge Ocwer Insert:

76,78.60 HRB Ave =

ho:f). insert (vocer hoif) one wec meforceft ecge). 25X. Nitol eten.

78HRB No further work was deemed necessary+

BuuE':N/Wwn 1992 W

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Attachnent 2 IN 92-68 Septe.mber 10, 1992 Page 1 of 4

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Alert Continues for Flanges from China

'Ihe Winter 1992 National Bocrd Bunctin quired by the ANSI B16 specification, included an article regarding a serious although they do bear the B16 mark.

problem found to exist on 14" slip on, raised-face Ranges.

NBBI advises double checking all flanges with the marking " China," especally Since publication,NBBI has leamed the before these flanges are placed in sernee.

problem described is onlyone of many associated with Ranges from the Peoples Certainly, flanges that have usible surface Republic of China.

discontinuities or incomplete markings may be easy to see. But the machined NBBI has been provided with a lab report surfaces of welded flanges can on!y be for a 4" weld neck flange SA-105N B16-5 detected through a volumetric form of with a BHN (Brinell Hardness Number) of NDE. The failure to meet heat treat, up to 500. Also, normalizing and chemis-mechanical or chemical requirements of try requirements do not meet SA-105 the specifications can only be venfied requirements.

through metallurgic examination.

These flanges have been reported to have This update is being distributed in the cracks and other surface discontinuities interest of public safety. Future updates

'p that might make them unfit for service. In will be published as more facts are lear ed.

addition, there have been reports that 3

some flanges do not meet thickness Further questions or concems should be requirements. NBBI also has been advised directed to A.M. Doc" Matthews. Jr. or through reinspection reports that some R.D.Schueler,Jr.at National Board head-flanges may not bear the markings re-quarters.

l

Attachraent 2 IN 92-68 September 10, 1992 Page 2 of 4 NB BinfdeneT/ VoLuwE 1 - NUMBER 17 - 5/1/92 Number of Suspect Flanges Growing at Alarming Rate The National Board continues to receive Inspections John McLouglin, late in May reports of several different types of in Bejing to discuss the problem.

flanges, ranging in sizes from 2 to 20" and marked ' China," that do not appear NBBI continues to advise double <hecking to be in accordance with ANSI B16 as all flanges with the marking China,"

markings.

especially before these flanges are placed in senice.

As the number of suspect flanges contin-ues to grow, so does the different types of Flanges that have visible surface problems related to these flanges.

discontinuities or incomplete markings may be easy to see. But the machined To date,over 7,000 have been removed surfaces of welded flanges can only be from service, including 1,600 recently detected through a volumetric fonn of discovered in a newly installed pipeline.

NDE. The failure to meet heat treat, An injunction has been ordered to cease mechanical or chemical requirements of -

work on the pipeline until the flange -

the spedfications can only be venfied problem has been resolved. The remain, through metallurgic examination.

ing 5,200+ flanges have been found mostly in refinenes.

NBBI will continue to publish updates as information is learned. This update is The president of the China Associatir.1of distributed in the interest of public safety.

Boiler and Pressure Vessel Inspection, Center of Boiler & Pressure Vessel Inspec-Further quesnons or concems should be t2on & Research of the Ministry of Labour, directed to A.M." Doc'Matthews.Jr.or P.R.C., Wang Hannuo, has agreed to meet R.D. Schueler,Jr. at National Board with National Board Assistant Director of headquarters."1

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IN 92-68 September 10, 1992 Page 3 of 4

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Flange Update: McLoughlin Meets Chinese Boiler / Pressure Vessel Officials John D. McLoughlin, assistant director of McLoughlin by Mr. Su Rung Ji, vice premier inspections,metwithseveralagenoesof the ~ of China. Mr. McLou5hlin gnet with Mr.-

Chinese government during his recent visit Zheng You Mei, director of the Reception to the Peoples Republic of China. The visit Bureau, State Council, P.R.C., Ms. Fan Jia was to discuss problems with flanges manu. Nian, assistant director of the Reception Bu-factured in China (and distributed to the resu, and several members of the Center of Boiler and Pressure Vesad Inspection and U.S.).

Research (representing the Ministry of La-Two meetings were held in Beijing.

bor). CBPVIR has been assisting the Na- -

tional Board in its investigation.

On May 28,1992, McLoughlin met with of5cials of the Center of Boiler and Pressure The director of the Reception Bunau was Vessel Inspection and Research, as weII as given copies ofinforma tion accumuh ted dur-representativer of Sharud Province Over-ing the course of Mr. McLoughlin's tnvesti-seas Tra ding Corpora tion, Tian Cong Com-gation and provided with a brief erplana tion pany and Qine Xinane Nan Xi Li Flartgr of the documents and the significance of Company.

each.

Mr. McLoughlin learned that Ding Xinang Mr. Zheng You Mei reported that Mr. Su Nan Xi Li has shipped seven to eight con-Rung Ji has a great interest in the Dange tainers (each with 17 tons of various types situation. He said the govemment appreci-and sizes of flanges) to the US. thmugh ated the information provided by'the Na-what is believed to be lacksonville. Dndda-tional Board. Mr.Zheng You Mei also said Shipping was reportedly provided by Shanxi that a complete report of the meeting would Province, Tian Cong and Bi!!iongeld (a be provided to Mr.Su Rung Ji.

Hong Kong trader with Beijing offices).

The meeting concluded after Mr. McLoughlin prov ded Mr.Zhen5 ou Mei with recom-Mr. Yang U Min of Sharud Province Over-i Y

seas Trading Corporation reported that the mendations on steps the government could base rnaterial for these flanges was 25 MN take to assure that steel mills and forging and possibly 16 MN (both Chinese forging makers produce enaterial and Danges that specifications) and not the A105 identified rneet AShi and ANSI specifications. The on both the nanges and rna terial test reports. National Board will be advised when or if these recommenda tions wi!! be implemented.

It was stated by Mr. Yang U Min that manu-faeturing identification on the Danges was Upon his return to the US, Mr. McLoughlin specfied by Billiongold (the Hong Kong received the labo ra to ry results of blind na nge trader) and not the flange manufacturer.

and slip on flange tests that were ordend prior to his departure. Results of these tests A second meeting was arranged for Mr. are as follows:

l IN 92-68 September 10, 1992 l

Page 4 of 4

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1 NBBlnfokcerivowwe i.wu..e. i.su a i.,-

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l E1anges contheued 1

1. Blind flange with an identifer of "PF" and marked A105 is reported to be a plate nate-.

nal.

2 Slip on flange with an identifier of USC or USIO and a heat #1406 contains alu5ged weld repan. The W weld repair indicator y

required by A105 is not stamped on the i

flange. The chemistry does not sneet A105.

l The mi11 report does not indicate any type of heat treat even thou5h the flangeis marked

% h.

A105N and has also been

• weld repaired."

Finany, photo mioographs indicate plate

{

0l$5-l material. The flange makers name is Shou I

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Cang Machisery ragm Company.

Th*N8"M 38 P'N **"D l

According to Mr. Mei.oughhn: "This office The Nationalloard of Bocer and Prunauw i

has Probably accomP shed allit can at this ves 11 rep.cors.1055cnapper Avenue..-

l h

Point, with the resouras availabh. N cohunks, Ohio 43*.29,(6141sas4:zo

-e National Board wiD publish a speda! edition i

of The Nationst Boert Bulletin that will ad-^

O_g, w r: m dress this problem. HopefuDy, we will be Easruher omster A.M. " Doc" ManhewsJr.,-

able ta report steps the Chinese government Assutmit Esarwher Dmster are taMng to insure that their flange psod.

F.D. Bennan, E ucts sneet spoofication.*

Dw everofcommwdcatuwe i

C The National Board wiD be providing vari-g ous a ppropriate agences of the US. govern-snent with information it has acquired through the investigation processO a

f f

i n

-+

'b IN 92-68 September 10, 1992 Page 1 of 1 LIST OF RECENTLY ISSUED NRC INFORMATION NOTICES Information Date of Notice No.

Subject Issuance Issued to 92-67 Deficiency in Design 09/10/92 All holders of Ols or cps Modifications to Ad-for nuclear power reactors.

dress Failures of Hiller Actuators Upon A Gradual Loss of i

Air Pressure 92-66 Access Denied to NRC 09/01/92 All holders of Ols-or cps-Inspectors at Five Star for nuclear power reactors Products, Inc. and and all recipients of.

Construction Products NUREG-0040, " Licensee, Con-Research, Fairfield, tractor and Vendor Inspec-Connecticut tion Status Report" (White Book).

92-65 Safety System Problems 09/03/92 All holders of OLs or cps Caused by Modifications for nuclear power reactors.

That Were Not Adequately Reviewed and Tested 92-64 Nozzle Ring Settings 08/28/92 All holders of OLs or cps on Low Pressure Water-for' nuclear power reactors.

Relief Valves 92-63 Cracked Insulators in 08/26/92 All holders of OLs or cps ASL Dry Type Transformers for nuclear power reactors.

Manufactured by Westing-house Electric Corporation 92-62 Emergency Response 08/24/92 All U.S. Nuclear Regulatory i

Information Require-Commission licensees'.

ments for Radioactive Material Shipments 92-61 Loss of High Head 08/20/92 All holders of OLs or cps Safety Injection for nuclear power reactors.

92-60 Valve Stem Failure 08/20/92 All holders of OLs or cps Caused by Embrittlement for pressurized water reactors (PWRs).

OL = Operating License CP - Construction Permit

,,ys ucy 8 '

o, UNITED STATES

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't NUCLEAR REGULATORY COMMISSION Q

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WASHINGTON, D. C. 20555 j;;

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EDO Principal Correspondence Control FROM:

DUE: 03/11/93 EDO CONTROL: 0008598 DOC DT: 02/16/93 FINAL REPLY:

S:in. Joseph I. Lieberman, Chairman Subcommittee ori Clean Air and Nuclear Regulation TO:

James Taylor FOR SIGNATURE OF:

• • PRI CRC NO:-

Executive Director DESC:

ROUTING:

REQUEST IN-DEPTH ANALYSIS OF METAL FLANGES MADE BY Taylor PEOPLES REPUBLIC OF CHINA AND USED AT NUCLEAR Sniezek POWER PLANTS Thompson Blaha DATE: 02/18/93 Knubel Denton, IP i

ASSIGNED TO:

CONTACT:

Scinto, OGC NRR Murley Kammerer, IP SPECIAL INSTRUCTIONS OR REMARKS:

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