ML20245A316

Requests Approval to Use Type 420 Stainless Steel Matl for Plugs in Unit 2 Main Feedwater Regulating Valves for Eliminating Excessive Wear Found on Original Components

ML20245A316
Person / Time
Site:	Beaver Valley
Issue date:	04/14/1989
From:	Sieber J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-72923, NUDOCS 8904250140
Download: ML20245A316 (15)

Text

{{#Wiki_filter:,_ 4 aver Valley Power Station Shippingport, PA 15040004 j c Pr se Nuclear Grop W2) 643 6256 April 14, 1989 U. S. Nuclear Regulatory Commission Attn: Document Control Desk pq (' 71 W Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Feedwater Regulating Valve Plug Material; Proposed Alternative to 10 CFR 50.55a(g) Gentlemen: The purpose of this letter is to request approval under the provisions of 10 CFR 50.55a(a) (3) to use Type 420 Stainless Steel material for plugs in the Beaver Valley Unit No. 2 main feedwater regulating valves. The reason for this material change is to eliminate.the excessive wear found on the original components. This was initially discussed on April 6, 1989, with Mr. R. Hermann and Mr. P. Tam of the NRC's staff and Mr. S. Sovick of my staff. ASME Section XI, Article IWD-7000, Replacements, states that materials shall meet the requirements to which.the original plant component or part was constructed. The material originally used for these valves is ASME SA-479, Type 304L/ Stellite weld overlay surface for the plug and anti-rotation pins and ASTM A 276, Type 420 SS for the valve cage. Previous experience has shown that ASTM A 276 Type 420 SS would eliminate wear concerns.

However, this material is not ASME Code approved for use as disks (plugs).

We

are, therefore, requesting approval to use the Type 420 SS material as an alternative to the Code accepted material for the plug in our feedwater regulating valves.

The Unit No. 2 feedwater regulating valve is an ASME III, ) Class 3 construction which utilizes materials permitted by ASME

III, Article ND-2000.

The normal operating function of this valve is to regulate the flow of feedwater to the rateam generatcrs. The safety function of 'chis valve is to servs as the redundant j feedsater isolation valve as detailed in the Unit No. 2 UFSAR Section 10.4. 1 0 8904250140 890414 PDR ADOCK 05000412 I l P PDC u

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• Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Page 2 During Unit No.

2's first operating

cycle, there feedwater regulating valves showed significantly greater wear and deterioration than was expected.

Figure 1 is a sketch of the Copes-Vulcan 12 inch Class 900 valve used at Unit No. 2. The excessive wear is associated with the anti-rotation pins which are designed to prevent the plug from rotating within the cage and potentially disengaging from the valve stem. Similar problems had been encountered in Unit No. 1 and were successfully corrected by utilizing a Type 420 SS material for the valve plug and anti-rotation pins. Since startup of Unit No. 1 in

1976, the main feedwater regulating valves have gone through a number of modifications to the trim in an effort to improve valve reliability.

In 1983, the present configuration was installed which was essentially a cavitation control design made of ASTM A 276, Type 420 SS cage and plug. This was acceptable since the Unit No. 1 feedwater piping was constructed to the ANSI B 31.1 Power Piping Code. From that time to the present, the three (3) main feedwater regulating valves' reliability has shown remarkable improvement in its wear resistance capability, especially around the anti-rotation pin area of the plug. This is the location where most wear has been experienced. Review of the maintenance history for these valves since 1983 shows that most repair / replacement activities occurred during the period from 1983 to

1985, when the anti-rotation pins' design was changed from a

mechanical attachment joint to a shrink fit arrangement. Since 1986, the valves have performed well with little maintenance related to the present trim / anti-rotation pin design. Recent inspections have shown excellent wear resistance by the ASTM A 276, Type 420 SS plug and anti-rotation pins. In order to determine material acceptability for the feedwater regulating valve

plug, we reviewed the applicable ASME III construction Code and Code Case N-62-4.

ASME III, Article ND-2121(c) does not recognize this material as acceptable for Class 3 valve components. Code Case N-62-4 recognizes Type 420 SS as acceptable material except when used for category 3 valve items (ie: discs and stems). Our present Unit No. 2 feedwater regulating valves use Tyne 420 SS for the stem retainer roll pin and cage. includes vendor drawings of the feedwater regulating valves for both units which illustrates the use of this material in each unit. We are pursuing, in parallel with this request, approval from the ASME Boiler Pressure Vessel Code Committee to use this material. It is our understanding that the NRC has reviewed and approved simi]ar requests to use materials prior to Code Committee approval of proposed Code case revisions (i.e. Public Service Electric and Gas Co. and Carolina Power and Light Co. requests in 1988 to use AL6XN material for service water piping. Code Case N-438-1 was subsequently approved in March of 1989 by the ASME Committees recognizing the use of AL6XN.)

4 Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Page 3 On April 6, 1989, we submitted an inquiry to the Secretary, ASME B&PV Committee, requesting a Code change which would permit the use of Type 420 S.S. (Attachment 1) We have requested that our proposed revisions to NB/NC/ND-2121(c) to Section III and Code Case N-62-4 be placed on the Section III and Main Committee agendas for the May 1989, meetings in Tulsa, Oklahoma. In preparing our inquiry for submittal to the ASME Committees, we discussed our proposed revisions with various members, chairmen and secretaries of the subgroup Materials, Fabrication and Examination, the Subcommittee on Nuclear Power (Section III), and the ASME B&P7 Main Committee. Strong support has been given to our proposed revisions since the acceptability of this material for valve plugs has been demonstrated in other applications. Copes-Vulcan provided the Type 420 SS plug for the Unit No. 1 valves. They were requested to provide additional documentation attesting to the acceptability of this material for this application. A letter from Copes-Vulcan, Attachment 2, documents successful testing and previous experience with this design. In summary, approval is requested to use Type 420 SS material for the plug in the Unit No. 2 feedwater regulating valves. Our request is based on successful use of this material in Unit No. 1 in the same application, vendor endorsement, and ASME Committee support. Our safety review has concluded that this change will not adversely affect valve operation and that it will continue to be able to perform its safety function. Since Unit No. 2 is currently shut down for refueling and our scheduled restart date is May 2, 1989, we request expedited review of this request. If you have any questions, please call me or members of my staff. Very truly yours, wD - 0% J. D. Sieber Vice President Nuclear Group cc: Mr. J. Beall, Sr. Resident Inspector Mr. W. T. Russell, NRC Region I Administrator Mr. P. Tam, Sr. Project Manager Director, Safety Evaluation & Control (VEPC3)

4 FIGURE 1 i 4 BODY / BONNET GASKET STEM BONNET j g I THIS HALF OF VIEW IS SHOWING THE PLUG AND CAGE '- ROTATED 90' ANO IN THE <CAGELOCK . OPEN POSITION. s ]_ gPLUG b ANTI- -ROTATION g "\\ PIN ROLL PIN j c r-UPPER O-R;NG W ( \\< FLOW i 16i iA -m- ' ',.' : : ' ',, ' l w p, ' ;,.' ' :

==?-. -*=== 4: ': = a -O T i' ? i 'i Y HUSH PORTING i' (LOWER RING \\_ CAGE s w VALVE BODY n ILLUSTRATION NO. 5 i

?.' sh des ' 'Af Duclues:1e Udit Nuclear Group Telephone (412) 3934000 P. o. Box 321 Shippingport, PA 15077-o321 ND3MNE:4721 Mr. G. M. Eisenberg, Secretary ASME Boiler and Pressure Vessel Committee United Engineering Center 345 East 47th Street (M/S 8E) New York, NY 10017 ASME III CONTROL VALVE DISC MATERIAL INQUIRY

Dear Mr. Eisenberg:

Duquesne Light Company currently operates two nuclear power plants. Beaver 'lalley Power Station (BVPS) #1 is an ANSI B31.1 Nuclear Power System, vhersas Beaver Valley #2 is an ASME Section III Nuclear Power System. BACKGROUND The high flow velocities which exist in nuclear power plants cause many i problems not previously encountered in fossil fired utility boiler systems. In the feedvater systems, the control valve disks (plugs) were supplied by the valve manufacturer as ASME SA-479, Type 304 stainless steel base material with Stellite veld overlay. This material selection was later changed to high strength material for the Unit #1 valve disks. For Unit #2, because the valves are ASME, Section III Class 3, it was not permitted by paragraph ND-2121 (c). However, at the completion of the first operating cycleton BVPS Unit #2, the ASME material showed significantly greater wear and deter'ioration than expected. I Ve are currently using ASTM A276, Type 420, 13% Chromium martensitic steel in the BVPS #1 plugs of the Main Feedvater Control Valveu as well as the cages and antirotation pins of both urei ts. The disk material has shown excellent results in performing its function in the cavitation control trim design. This material is used extensively in control valve applications by the entire industry. Failure of the plug material, which is enveloped by the cage, vill not result in failure of the valve pressure boundary material. The j valve is designed to fail safe in the closed position. It therefore l approximates the protected situation found in the safety valves excluded nov in paragraph 2121 (c). Even if the valve plug vere to fail open, flow control and isolation can be schieved by other valves in the system. l ( \\

<ND3HNE-4721 April 6, 1989 Page 2 INQUIRY Ve request two parallel actions for the committee's consideration. Revision 1 Due to our time constraints, we request urgent consideration of a proposed revision to Note (1) to Table 3.1.2-1, Code Case N-62-4, as shown in the attachment. The new note vill read: 1) Not to be'used for Category 3 Valve Items, except for: safety valve disks and nozzles, when the nozzles are internally contained by the external body structure; control valve disks, when the primary function of the valve is flow control; and line valve disks in valves with inlet connections NPS 2 and less. Revision 2 j \\ Ve request revision of paragraphs NB/NC/ND-2121(c) as shown in the attachments. This change vill' clarify that the 2 inch valve inlet restriction applies only to line valves. It vill also provide the same exemption from material specifications listed in Appendix I, now permitted for safety valve disk and nozzles in 2121(c), to plugs of control valves. Both revisions are urgently

needed, and Duquesne Light Company respectfully requests that they be placed on the Section III and Main Committee agendas for the May meetings in Tulsa, and letter balloted by SG MFE (SC III). Ve are scheduled to complete our first refueling outage prior to that time.

Please contact Mr. J. C. DiPerna (412) 393-5542, Mr. M. P. Pettigrev, (412) 393-5554, or myself at (412) 393-5600, if additional information is required. Very truly yours, / f ) \\ i N. R. Tonet, P.E., Managn I Nucles.r-Engineering Departaent ) f M"PP/ cal Attachment cc: R. L. Hansen M. P. Pettigrev V. S. Lacey J. R. Vasunick J. D. DiPerna G. S. Sovick L. Bussard (Factory Hutual) Central File (2) _j

CASE (continued) N-62-4 CASES OF ASME BOILER AND PRESSURE VESSEL CODE Revise Note (1) to Table 3.1.2-1 as follows: (1) Not to be used for Category 3 Valve Items, except for: safety valve disks and nozzles, when the nozzles are internally contained by the external body structure; control valve disks, when the primary fune-tion of the valve is flow control; and'line valve disks in valves with inlet connections NPS 2 and less. Notes to Table 3.1.21 u (1) '!:: :: b ' != ,: ; 2 "& - - - - ;' != 2 _: 2 *. =! h= : : 2 ;.r = -eane.-- (2) Welding of these materials is not permitted. (3) For thou materds in this table whidi do not hm allowshic stresses assigned, um 1/4 .r of room temperatum specirmed nununum tensile strength.up to 650 F indusive. (4) The material shd be identified with this Case number in addition to the identification requirements of 3.1.7.1 Where the tensile strength, ylmid strength, hardness, tempering temperatum or aging temperature listed in Table 3.1.21 differ from the requirements of the material specification, the minimum requirements listed in Table 3.1.21 shall apply. (5) The maximum tensile strength shd not exceed the specified mmunum tensile strength by more than 40.0 kai. (6) In addition to the requirements of 3.1.7.1 these materials shd be marked with the mini. mum specified tensile strength,in kai, and this Case number. (7) This material chd not be used at temperatures higher than 450 F. (8) Carbon content ehd not exceed 0.35%. l / A 189

ARTICLE NB-2000 MATERIAL NB-2100 GENERAL REQUIREMENTS NB 2'I20 PRESSURE RETAINING 4 FOR MATERIAL MATERIAL NB-2121 Permitted Material SpeciSestioes (a) Pressure retainmg material and material' welded thereto, eacept as permitted in NB-4435, and except.. for weldmg, brazmg, and hard surfacing metals and cladding which is 10% or less of the thickam== of the base material (NB 3122), shall confonn to the require-ments of one of the speci5 cations for matenal given in.- l Tables I 1.0 and to all of the special requirements of this Aracle which apply to the product form in which i. the materialis used. (b) The requirements of this Article do not apply to (c) Material made to specifications items not associated with the pressure retainmg other than those specified in function of a component, such as shafta, stems, trim, Tables I-1.0 may be used for the spray nozzles, bearings, bushings, springs, and wear following applications: plates, nor to seals, packing, gaskets, valve seats, and ceramic insulating material and special alloys used as (1) Safety valve disks and seal material in electrical penetration masamblies. nozzies, when the nozzies (c) Matenal made to speci8 cations other than those are internally contained by spectaed in Tables I 1.0 may be used for safety valve the external body structure, disks and nozzles, when the nozzles are internally

• contained by the external body structure, and for valve (2) Control valve disks and cages,

' disks in line valves whose inlet connections are 2 in. when the primary function of nommal pipe size and less. the valves is flow control. (d) Material for instrument line Attiags, 1 in. noaunal pipe size and less, may be of material made to (3) Line valve disks in valves sphtions other than those listed in Appendix L whose inlet conraections are Provided that the Attings are in confonnance with the NPS 2 and less, requartments of NB-3671.4 and the mateniel is deter-inised to be adequate for the service conditions by the P P ng sywem designer. ii (e) Weldag and brazmg raatanal used in the manufacture of items shall comply widi an SFA l spmArenan in Section II, Part C, except as otherwise permitted in Section IX, and shell also oc:nply with the appbcable requirements of this Article. The requiremeuE of this Artcle do not apply to mktetial used as backing rings or backing strips ia welded joints. 9 l

I I 1 i ARTICLE NC-2000 l MATERIAL NC 2100 GENERAL REQUIREMENTS of the casting excluding flanges and sections designat-FOR MATERIAL ed by the designer as nonpressure-retaining. 4 NC 2120 PRESSURE RETAINING MATERIAL NC 2121 Permitted Material Specifications (a) Pressure retaining material shall conform to the requirements of one of the specifications for materials given in Tables I-7.0 and to special requirements of this Article which apply to the product form in which the material is used. For vessels which are designed in accordance with NC-3200, the materials shall be restricted to those materials listed in Tables I 1.0 and to the following clad prcduct specifications, provided they are composed of materials listed in Tables I l.0: SA 263 Specifiestion for Corrosion-Resisting Chromium-Steel Clad Plate, Sheet, and Strip SA 264 Specification for Cctrosion-Resisting Material made to specifications Chromium Nicke! Steel Clad Plate, Sheet, and Strip (c) other than those specified in SA 265 Specification for Nickel and Nickel-Base Tables I-7.0 may be used for the Alloy Clad Steel Plate following applications: (3; lhe requirements of this Article do not apply to items not associated with the pressure retaining (1) Safety valve disks and nos.zles, fenetion of a component such p shds, stems, trim, when the nozzies are intern-spay nurjew bearing bushings, springs, wear plates, l ally contained by the external nor to seals, packing, gaskets, vr.lve seats, and cerartic body structure

• insulating mater?,als and special alloys used as seal matenals in electrical pene(ration assemblies.

(2) Control valve disks and cages, (c) Material made to specifications other than those' when the primary function of speci$ed in Tables I-7.0 may be used for safety valve the valves is flow control. disks and nodles, when the noulas are internally

• " contained by the external tody structure, and for valve (3) Lino valve disko in valves i

disks in line valves whose inlet connections are 2 in. whose intot connections are

comma! mice size and lew.

l NPS 2 and less. (d) Msterial for line fittings,1 in, ncmina.) pipe size I ' and less, may be of material made to specifications 9 l

9 ARTICLE ND-2000 MATERI AL I f the essring, excluding flanges and rections designat. ND-2I00 GENERAL REQUIREMENTS ed by the designer as nonpressure-retammg. FOR MATERIAL ND 2120 PRESSURE RETAINING MATERIAL ND-2121 Permitted Material Speci6 cations (a) Pr:aure retaining material shall conform to the i requirements of one of the speci6cauons for materials i listed in Tables I 7.0 and I-8.0 and to the ?pecial requirements of this Article which apply to the product form in which the material is used. (b) The requirements of this Article do not apply to items such as thafts, stems, trim, spray nozzles. bearings, bushings, spring;s, and wear plates, nor to seals, packing, gaskets, valve seats, and ceramic insulating materials and special alloys used as seal materials in electrical penetration assemblies. (c0 Etterial made to specifications (c) Matenal made to specification: other than thos( mher than those specified in specified in Tables I 7.0 and I 8.0 may be used for "sbles I-7.0 and I-8.0 may be used safety valve disks and nozzles when the nozzles are Lor the following applications .es internally contained by the external body structure and for valve disks in line valves whose inlet connec-(1) Safety valve disks and nozzles, tions are 2 in. nominal pipe size and less. when the nozzles are intern-(d) Material for line nttmgs,1 in. nominal pipe size ally contained by the exter-and less, may be of material made to specifications nal body structure. other than those !isted in Appendix I, provided that i the fittings are in conformance with the requirements (2) Control valve disks and cages, of ND-3671.4 and the material is determined to be when the primary function of adequate for the service. conditions by the piping the valves is flow control. system designer, j (c) Welding and brazing materials used in manufac-(3) Line val e disks in valves I ture of items shall comply with an SFA specification whose inlet connections are j in Section II, Part C, except as otherwise permitted in NPS 2 and less. Section IX, and shall also' comply with the applicable requireme, pts of this Article. The requirements of this Article do not apply to matenals used as backing rings or backing strips in welded joints. 9 i

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\\ P.O Box 577 LAKE CITY, PENNSYLVANIA 16423 PHONE B14 /7744161 TELEX: 91-4414 April 12, 1989 Duquesne Light P.O. Box 321 Shippingport, PA 15077-0321 ATTN: Mark Pettigrew FAX No.: (412)393-5536 SUBJ: Feedwater Plug Stress Analysis

Dear Mark,

A complete stress analysis for the feedwater plug. P/N 299794 in use at Duquesne Light Company, Beaver Valley Unit No.1. does not exist. This plug has been designed using proprietary guidelines developed in analysis and test of prototypes of similar design. The prototype analysis and testing serformed used static and dynamic loads equivalent to actual service conditions of tiis application. 'In addition, thousands of hours of satisfactory performance for plugs of this design under similar service conditions ensures that the plug design is acceptable for this application. F Very truly yours, COPES-VULCAN, INC. f.t.r A' R. L. Fetterman Sr. Applications Engr. l RLF/ cat _ _ _ _ _ _ _ _ _ _ --. _ _ _ _ - _ _ _}}