ML20065K986

Responds to Request for Addl Info Re ASME Class 1 Block Forged Tees,Per 940218 Telcon Request.Fittings Meet ASME Code Requirements

ML20065K986
Person / Time
Site:	Vogtle
Issue date:	04/14/1994
From:	Mccoy C GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LCV-0226-B, LCV-226-B, TAC-M81760, TAC-M88385, NUDOCS 9404200213
Download: ML20065K986 (5)

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e. K. uccoy Georgia Power on n- ..

,. .(, , .+ a vin m spica; April 14, 1994 LCV-0226-B Docket Nos. 50-424 50-425 TAC Nos. M81760 M88385 U. S. Nuclear Regulatory Commission ATTN.: Document Control Desk Washington, D. C. 20555 Gentlemen:

VOGTLE ELECTRIC GENERATING PLA'.NT REQUEST FOR ADDITIONAL INFORMATION ASME CLASS 1 BLOCK FORGED TEES The issue concerning ASME Section III, Class I block forged tees was first reported by Georgia Power Company (GPC) pursuant to the requirements of 10 CFR 21 and 50.55(e),

on December 15,1988. During a conference call on February 18,1994, the stafT requested additional information concerning the January 14,1994 GPC letter on this subject.

Enclosed are responses to the staffs request for additional information relating to clarification of the material requirements of the forged fittings, and control of ASME Class 2 and 3 fittings in the warehouse. The block forged fittings which are the subject of this evaluation have been found to meet ASME Code requirements as documented in our previous letter. Any block forged fittings used in the future will also meet , he applicable ASME Code requirements.

Sincerel ,

C. K. McCoy l CKM/ JAB /gmb ,

Enclosure cc: (See next page) 0 0

4200213 94o434 Q ADOCK 05000424 \

PDR

G.+eorgia. Power n U. S. Nuckar Regulatory Conunission Page 2 cc: Georgia Power CompiinJ hfr. J. B. Beasley, Jr.

Mr. M. Sheibani NORMS U. S. Nuclear Regulatory Commission Afr. S. D. Ebneter, Regional Administrator Mr. D. S. Hood, Licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspector, Vogtle LCV-0226-B

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- ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION REGARDING AS3]E CLASS 1 BLOCK FORGED TEES

1. Ikqunl; As stated in ANSI B16.9, fittings covered by this standard shall be in accordance with ASTM Specifications A234, A403, A420 or the corresponding ASME Specification.

The Georgia Power Company response states that the base material for the ASME Section ill Class I large bore tees is SA-182. And, there are other small tees with a base material of SA-479 and SA-312; as indicated in letter BS: 7694 dated November .

14,1988. Please reconcile.

Repsas.e.;

The base material for the ASME Class I large bore block forged tecs is SA-182.

Other small bore fittings were supplied with base material as stated above. The ASME materials SA-182, SA-479 and SA-312 are permissible raw materials for SA-403 as shown in Table 1 (Permissible Raw Materials) and paragraph 41 of the 1974 edition of the ASME Boiler and Pressure Vessel Code2 , Section 11, SA-403 Material Specification A copy of this table and paragraph is included. Consequently, the use of raw materials SA-182, SA-479 and SA-312 is permissible.

2. ILe_qunl; Describe the controls necessary for ASME Class 2 and 3 forged fittings which may be in the warehouse.

Ruponse; The ASME Section 111 Class 2 and 3 fittings in the warehouse, have previously been verified to meet the requirements of the ASME Code, including the ANSI B16.9 dimensional and proof test requirements, and the Vogtle purchase order specifications.

I Material SA-479 Type 304L was used for several 2 inch tecs, and it meets the requirements of this paragraph.

2The Vogtle Electric Generating Plant ASME Section 111 Design Specification Matrix for Components, Partr, Appurtenances, and Piping systems, Document X4P0005 Revision 12; references the 1974 Edition through the Summer 1975 Addenda for the design specification and fabrication of Nuclear Senice Piping.

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ENCLOSURE (CONTINUED)

REQUEST FOR ADDITIONAL INFORMATION REGARDING AS.ME CLASS 1 BLOCK FORGED TEES 1

The ASME Code does not require thermal transient and fatigue analyses or special considerations for the use of forged fittings in Class 2 and 3 systems, as long as the fittings meet the Code requirements.

If the Class 1,2, or 3 fittings meet ANSI B16.9 dimensional and proof testing requirements, then ANSI B16.9/ASME Section 111 stress indices or stress intensification factors may be used. Further, the use of forged tees instead of extruded tees does not affect the allowables used in the stress analyses.

The allowables used in the Vogtle stress analyses are those for the lowest allowable pipe material listed in the Vogtle Piping Materials Classification document, drawing AX4DR001, for a particular pipe class. The pipe material allowables are equal to or lower than those of the fittings. Thus the allowables utilized were conservative.

Since the Class 1 tees have beenjustified/ qualified as documented in GPC's previous letter, then the Class 2 and 3 fittings are also qualified for the following reasons: ,

a) The ASME Section 111 stress indices were acceptable for use in the Class 1 evaluations, and no special factors were developed or required, i b) Allowable stress values used in the analyses are conservative, c) Class I analyses are comparatively more strenuous. The basis for determining allowable stresses can be found in Appendices 1 and 2 of ASME Section II, part D. The Class 1 analysis is more sophisticated and consequently the analysis considers the specific weight and wall thickness variations that may be affected by block forged tees.

Therefore, since the ASME Code requires no difTerent factors or analyses for forged fittings that meet the Code requirements, no special controls are required for ASME Section Ill Class 2 and 3 fittings which may be in the warehouse.

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, . 3 ENCLOSURE (CONTINUED)

REQUEST FOR ADDITIONAL INFORMATION REGARDING ASME CLASS 1 BLOCK FORGED TEESV

- S A-403 SECTION 11, PART A MATERIAL SPECIFICATIONS

4. Material 4.1 The steel for fittings may consist of blooms, billets, slabs, forgings, forging quality bars, plates, seamless or welded pipe, or tubes that conform to the requirements for melting process and chemical composition and are capable of conforming to the mechanical property requirements of the ASTM speciri, cation for the particular grades referred to in Table 1.

TAbt.E I Pesedadhee new Mosestals Permissib6e Ree Mstenals' ,

Martimg* Type of Matenal Pipe- Plate Bar Forging WP 304 . 304 (18 8) A 312. Grade TP 304 A 240. Type 304 A276 Type 304 A 182. Grade F 304.

UP 304H . 304H (18 8). carbon 0 04 to A 312. Grade TP 304H A 240, Type 304' A276 Type 304 A 182. Grade F 304H 010 percent WP 304L . 304L (18-81. carbon 0 035 per- A 312. Grade TP 304La . A 240. Type 304L' A276 Type 304Ld A 182. Grade F 304L Cent maa WP 309 A 312. Grade TP 309 A 240. Type 3095 A276 Type 309S a CfP 310 . . .. A 312. Grade TP 310 A 240. Type 310S A276 Type 310S - A 182. Grade F 310 WP 347 347 (18 8 Cb plus Tal A 312. Grade TP 347 A 240. Type 347 A276 Type 347 A 182. Grade F 347 WP 316 . . 316 (18-8. Mol A 312. Grade TP 316 A 240. Type 316 A276 Type 316 A 182. Grade F 316 WP 316H . 316H (ll.8. Mo), carbon 0 04 A 312. Grade TP 316H A 240. Type 316' A276 Type 316/ A 182, Grede F 316H to 0.10 percent CfP 316L . 316L (18-8. Me), carbon 0.0M A 312. Grade TP 316Le - A 240. Type 316L* A276 Type 316Ld A 182. Grade F 316L percent, ms:

WP 317 317 (184. Mol A 312. Grade TP 317 A 240. Type 317 s

• OP 321 . . . 321 (184. Til A 312. Grade TP 321 A 240. Type 321 A276 Type 321 A 182. Grade F 321 WP 321H . 321H (18 8. TD, carbon 0 04 to A 312. Grade TP 321H A 240. Type 32i' A276 Type 32t/ A 182. Grade F 321H 010 pere.ent WP 347H . M7H (18-8. Ob + Tal. carbon A 312. Grade TP 347H A 240. Type 347' A276 Type 347I A 182. Grade F 347H 0.04 to 010 percent WP 348 348 (18 8. Cb) A 312, Grade TP 348 A 240. Type 348 A216 Type 348 A 482. Grade F 348

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• When fittings are of mewed constructen, the symbol sheen shall be supplemented by the letter "W."

' See 2.1.

• Metenats in accordance seith $pecificapons A 358. Class 1. or A 376 may be specified ehev required as shernates to Specification A JI2.

8 f.scept that the minimum tensile strength shall be 63.000 pai(448 M Pa) and the minimum yield strength shall be 23.000 ps:(l?2 M Pat

'On pierced tubing the nicast may he il 00 to 16 00 percent provuled that the chrom 4um is adjusied to ensure fully ausienius structare.

8 Eacept that the carbon content shall be 0.04 to 0.10 percent.

8 Esme as Specificanon A 276. Type 316. eacept molybdenum shall be 3.00 to 4 00 percent and chromaum shall be 18 00 to 20 00 percent

• No ASTM speesficapon is avadable The chemical and mechanical propetues shall be the same as the corresponding bar values.

3From the 1974 Edition of the ASME SA403 SM% tion for Wrought Austenitic Stainless Steel Pipe Fittings. <

• The 2 inch tecs with base material of SA-479 meet the chemical and inechanical property requirements of ASTM Material A 276 as allowed for in paragraph 4 of the SA403 Material Specification and are therefore acceptable (Type 304L).

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