ML021220408
| ML021220408 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/19/2002 |
| From: | Hartz L Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 02-251 | |
| Download: ML021220408 (12) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 April 19, 2002 U.S. Nuclear Regulatory Commission Serial No.02-251 Attention: Document Control Desk NL&OS/ETS RO Washington, D.C. 20555 Docket Nos.
50-280 50-281 License Nos.
DPR-32 DPR-37 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS I AND 2 ASME SECTION XI REVISED RELIEF REQUESTS SR-27 AND SR-32 ALTERNATIVE REPAIR TECHNIQUE - REACTOR VESSEL HEAD AND SUPPORTING PROCEDURE QUALIFICATION RECORD In a letter dated December 3, 2001 (Serial No. 01-637B), Virginia Electric and Power Company (Dominion) committed to provide a welding procedure qualification record (PQR) to support the NRC review of Relief Requests SR-27 and SR-32 for Surry Units 1 and 2, respectively. These relief requests would permit the use of an alternative repair technique in the event that any flaws requiring repair in reactor vessel head penetrations were discovered during reactor vessel head penetration inspections. This letter submits the PQR and a revision to relief requests SR-27 and SR-32 to resolve the one item in the PQR that did not meet a previously identified material condition in the relief request.
The PQR met the conditions of the relief request in each area except one. Specifically, the relief request required that "the average values of the three HAZ impact tests will be equal to or greater than the average values of the three unaffected base metal tests."
However, testing indicated that at 30°F the average base metal impact test for mils lateral expansion was 50.3 mils compared to 47.7 mils for the HAZ. In lieu of running another PQR, Dominion is modifying the relief requests to use the PQR acceptance criteria in ASME Section III.
In this instance Dominion does not seek additional relief from ASME Ill, but rather requests use of the provisions of ASME III for acceptance of the welding PQR. to this letter provides the PQR and Attachment 2 provides the basis and additional acceptance criteria for the welding procedure qualification. Please substitute the revised acceptance criteria to complete your review of Relief Requests SR-27 and SR-32.
I
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Please contact Mr. Thomas Shaub at (804) 273-2763, if there are any questions about this submittal.
Very truly yours, Leslie N. Hartz Vice President - Nuclear Engineering Commitments made in this letter: None Attachments
- 1. Framatome ANP Procedure Qualification Record 55-PQ7183-01
- 2. Revision to Relief Requests SR-27 and SR-32 cc:
U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23 T85 Atlanta, Georgia 30303 Mr. R. A. Musser NRC Senior Resident Inspector Surry Power Station Mr. R. A. Smith Authorized Nuclear Inspector Surry Power Station
Attachment I Relief Requests 27 and 32 Ambient Temperature Temperbead Weld Repair Technique Framatome ANP Procedure Qualification Record Surry Power Station Units 1 and 2 Virginia Electric and Power Company (Dominion)
PROCEDURE QUALIFICATION RECORD 55-PQ7183-01 PROCEDURE QUALIFICATION RECORD PQ7183-01 PREPARED BY:
REVIEWED BY:
APPROVED BY:
SWE ENGINEER r-InJ SA3~
COGNIZA*T ENGINEER MANAGER, WELDttG SERVICES DATE:
0.ao o_
DATE:-/
DATE:
2
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February 20, 2002 Page 1 of 6 A
FRAMATOME ANP Page 1 of 6 February 20, 2002
55-PQ7183-01 RECORD OF REVISIONS DATE DESCRIPTION OF REVISION February 15, 2002 February 20, 2002 Original Issue Corrected toughness testing column headings (MLE & % shear)
February 20, 2002 Page 2 of 6 A
FRAMATOME ANP PROCEDURE QUALIFICATION RECORD REVISION 00 01 February 20, 2002 Page 2 of 6 A
PROCEDURE QUALIFICATION RECORD FRAMATOME ANP 55-PQ7183-01 WPS USED FOR TEST:
WP3/43/F43TBSC3-00 (Draft)
TYPE:
Machine WELDING PROCESS (ES):
GTAW JOINTS (QW-402)
Mateial pec:SA-53 toSB-I68 Psitin ofGrooe:63 1.50-Alloy 600 S3.6 25.
R 1/1 6 0.625" SA-533 G r B Class1 Material Spec:
SA-533 to SB-1 68 Position of Groove:
3G Welding Progression Type & Grade:
Grade B Class 1 to UNS N06600 (Vertical):
Vertical up P-No. / Gr. No.
P-3 Group 3 to P-43 Other:
None Thickness of Coupon:
P-3 = 3.625*, P-43 = 1.5" Diameter of Coupon:
N/A POSTWELD HEAT TREATMENT (QW-407)
Backing Materials:
N/A Soak Temperature:
None Other.
SA-533 material was stress relieved Time at Temperature:
N/A for 66 hrs. R 11 50°F before welding.
Heating/Cooling Rates:
N/A Weld cavity has 6" of BM restraint Other:
None SA-533 Heat Number.
B9064-4 SB-168 Heat Number:
34985-1B February 20, 2002 Page 3 of 6 Page 3 of 6 February 20, 2002 A
PROCEDURE QUALIFICATION RECORD "FRAMATOME ANP 55-PQ7183-01 FILLER METALS (QW-404)
ELECTRICAL CHARACTERISTICS (QW-409)
Weld Metal Analysis A-No.:
N/A Electrode Type:
EWTh-2 Filler Metal F-No.:
43 Electrode Size:
1/8" diameter SFA Specification:
SFA-5.14 Pulse Current (Freq/Width):
All Layers (2.0 pps / 40%)
AWS Classification:
ERNiCrFe-7 (Code Case 2142)
Arc Voltage Control:
Automatic Maximum Pass Thickness:
1 1s Layer - 0.080" Electrode Extension:
1/8" to 314" 21 Layer- 0.110" Current-Polarity:
DC-SP (Electrode Negative) 3rd Layer- 0.110" Layer Voltage:
Amps (P/B)
Travel (ipm)
Consumable Insert:
N/A 1
9.5 210/115 4.5 Deposited Thickness:
1.5" 2
9.8 280/120 4.0 Size of Filler Material:
.035" diameter 3
10.0 280 1120 4.0 Heat Number:
HT# NX2424JK Bal 10.0 310/130 3.8 Wire Feed Speed (ipm):
Heat Input /lin) = (A x V x 60) / TS Layer Primary Background.
Layer Heat Input (J/In) lst 40 30 1st 19,380 2-60 50 2 nd 27,048 3rd 60 50 3ro 27,600 Balance 60 50 Balance 31,895 Maximum PREHEAT (QW-406)
TECHNIQUE (QW-410)
Preheat Temperature:
690 F Minimum String or Weave:
Stringer Interpass Temperature:
99.40 F Maximum Bead Width:
.270" to.420" Other:
Water backing was utilized on the Single/Multiple Electrode:
Single backside of the weld Single/Multipass (per side):
Multipass GAS (QW-408)
Orifice I Cup / Nozzle Size:
- 12 Purge Gas:
N/A Flow Rate:
N/A Peening:
None Shield Gas (CFH):
Argon Flow Rate:
35 CFH Bead Overlap:
50% +/- 25%
Trailing Gas:
N/A Flow Rate:
N/A Welding System:
Dimetrics MPC & F Head Gas Composition:
Welding Grade Argon Other None Other:
None page 4 of 6 February 20, 2002 PROCEDURE QUALIFICATION RECORD FRAMATOME ANP 55-PQ7183-01 TAlI(WNF
TFT
(OW 17O
MILS DROP SPECIMEN NOTCH SPECIMEN SIZE TEST TEMP.
FT. LBS LATERAL
% SHEAR WEIGHT NO.
LOCATION EXPANSION BREAK (Y / N)
BMDW-1 Base Metal 5/8" x 2" x 5"
-40*F N/A N/A N/A Yes BMDW-2 Base Metal 5/8" x 2" x 5"
-300F N/A NIA N/A No Break BMDW-3 Base Metal 5/8" x 2" x 5"
-30*F N/A N/A N/A No Break BMCVN-4 Base Metal
.394 x.394 x 2.165
+201F 54 48 30 N/A BMCVN-5 Base Metal
.394 x.394 x 2.165
+20°F 46 43 30 N/A BMCVN-6 Base Metal
.394 x.394 x 2.165
+20°F 55 54 30 N/A BMCVN-2 Base Metal
.394 x.394 x 2.165
+201F 47 40 20 N/A BMCVN-3 Base Metal
.394 x.394 x 2.165
+20°F 51 44 30 N/A BMCVN-7 Base Metal
.394 x.394 x 2.165
+301F 59 53 20 N/A BMCVN-8 Base Metal
.394 x.394 x 2.165
+300 F 54 51 30 N/A BMCVN-9 Base Metal
.394 x.394 x 2.165
+30°F 61 47 20 N/A HAZCVN-1 Heat Affected
.394 x.394 x 2.165
+301F 82 41 65 N/A HAZCVN-2 Heat Affected
.394 x.394 x 2.165
+30°F 95 48 70 N/A HAZCVN-8 Heat Affected
.394 x.394 x 2.165
+30°F 94 54 70 N/A HAZCVN-6 Heat Affected
.394 x.394 x 2.165
+35°F 95 49 45 N/A HAZCVN-7 HAZCVN-9 Heat Affecte Heat Affecte
.394 x.394 x 2.165
+351F 84 52 d
.394 x.394 x 2.165
+35°F 95 50 55 N/A Comments: Base Material RTNDT = -30oF.
The average absorbed energy and mils lateral expansion values obtained for Heat Affected Zone specimens 6, 7 & 9, at test temperature of +35°F equals or exceeds the base material average absorbed energy and mils lateral expansion values for Base Metal specimens 7, 8 & 9 at a test temperature of +30°F. When welding with this procedure 50F should be added to the RT1DT of the base material on which welding is performed.
All Charpy V-Notch specimens were removed at a depth of.750" transverse to the maximum working direction of the plate, which is equivalent to /2 the weld groove depth. All base metal specimens were machined with the V - notch perpendicular to the plate surface. All HAZ specimens were machined with their longitudinal axis inclined so that the V-notch would contain as much HAZ as possible.
All Base Metal Drop Weight specimens were also removed at a depth of.750".
Page 5 at b February 20, 2002 A
Page 5 of 6 N/A
- d 35 A
PROCEDURE QUALIFICATION RECORD FRAMATOME ANP 55-PQ7183-01 WIDTH THICKNESS AREA ULTIMATE TOTAL ULTIMATE UNIT TYPE OF FAILURE &
SPECIMEN NO.
(inches)
(inches)
(sq. inches)
LOAD (lb.)
STRESS (psi)
LOCATION RSTT-1 1.4406 0.74920 1.079297520 102,474 95.0 Ductile I Weld RSTT-2 1.5074 0.75065 1.131529810 104,612 92.5 Ductile / Weld Comments: Specimens machined per figure QW-462.1(a)
GUIDED BEND TESTS (QW-160)
SPECIMEN NO.
TYPE FIGURE NUMBER RESULTS TSB-1 Side Bend QW - 462.2 Acceptable TSB-2 Side Bend QW - 462.2 Acceptable TSB-3 Side Bend QW - 462.2 Acceptable TSB-4 Side Bend QW - 462.2 Acceptable Comments:
FOTHER TESTS & INFORMATION:
Type of Test:
Metallographic examination of the HAZ of three (3) weld cross-section specimens was performed. No evidence of untempered martensite was observed per WMT&R report 2-21455.
WELDER (S) NAME:
Don VanSteen / Neil Whaley ID/STAMP NO:
V1i124 / W9849 TEST CONDUCTED BY:
Westmoreland Mechanical Testing LABORATORY TEST WMT&R 2-20928 NO:
We certify that the statements in this record are correct and that the test welds were prepared, welded and tested in accordance with the requirements of ASME Section Xl and Code Case N-638.
Framatome ANP I
C l..,
t I
Company FRA-ANP Date IWelding Engineer Dt February 20, 2002 Page 6 of 6 TENSILE TESTS IOW-1 501 Page 6 of 6 February 20, 2002 Revision to Relief Requests 27 and 32 Ambient Temperature Temperbead Weld Repair Technique Surry Power Station Units I and 2 Virginia Electric and Power Company (Dominion)
Discussion of the Revision to SR-27 and SR-32 for Welding Procedure Acceptance Criteria The welding procedure qualification record (PQR) complies with Relief Requests SR-27 and SR-32 in each area except one. Paragraph 2.1 (g) of the SR-27 and SR-32 states "the average values of the three HAZ impact tests will be equal to or greater than the average values of the three unaffected base metal tests." At 30°F the average base metal impact test for mils lateral expansion was 50.3 mils compared to 47.7 mils for the HAZ. In lieu of running another PQR, Dominion is modifying the relief requests to use the PQR acceptance criteria in ASME Section III.
In this instance, Dominion does not seek additional relief from ASME Ill, but rather requests use of the provisions of ASME III for acceptance of the welding PQR. Specifically, the applicable portions of ASME III (1989 Edition) found in subsubparagraphs NB-4335.2 (b)(2) and NB-4335.2(b)(3) will be used. The changes to the ASME III wording are summarized below:
- 1. The sentence in subsubparagraph NB-4335.2 (b)(3) which referred to determining RTNDT per NB-2331 and NB-2332 for the base materials to be welded in production was modified to reflect that the nil ductility (RTNDT) temperature of the base materials to be welded was determined using the original construction Code.
- 2. The final three sentences of subsubparagraph NB-4335.2 (b)(3) are deleted since they would not be needed to support utilization of the Framatome PQR (the PQR produced a positive temperature adjustment).
When using the revised relief request wording to evaluate the Framatome PQR the average mils lateral expansion for the HAZ at 350F equaled that of the average for base metal at 30 0F. This yields an RTNDT adjustment temperature of +50F. In the case of the SPS 1 repairs this will result in the adjusted RTNDT for the affected RV head base metal being increased from +0°F to +50F. The increased RTNDT for the head will have no impact on the operability of the head because other parts of the head and RV have higher RTNDT values.
In conclusion, revising relief requests SR-27 and SR-32 to include the criteria identified above will continue to assure sound permanent repair welds and an acceptable level of quality and safety.
Revised Wording for Relief Request SR-27 and SR-32 Insert new text after existing paragraph 2.1 (g) on page 20 of 34 in Enclosure 1 of to the October 30, 2001 letter. (Serial No. 01-637A)
(h) If the average Charpy V-notch lateral expansion for the heat affected zone of 2.1(g) above is less than that for the unaffected base material, and the qualification test meets the other criteria of acceptance, the Charpy V-notch test results may be recorded on the Welding Procedure Qualification Record. Data shall then be obtained as specified in 2.1(i) below to provide an additive temperature for any base material for which the welding procedure is being qualified, and shall be included. Alternatively, the welding procedure qualifi cation may be rewelded and retested.
(i) The data for use in 2.1 (h) above shall be developed by performing additional Charpy V-notch tests on either the welding procedure qualification heat affected zone or the unaffected base material, or both, at temperatures which provide lateral expansion values equal to or greater than 35 mils. The average lateral expansion data for the heat affected zone and the unaffected base material shall be plotted on a lateral expansion-temperature chart. The temperatures at which these two sets of data exhibit a common lateral expansion value equal to or greater than 35 mils shall be determined. The determined temperature for the unaffected base material shall be subtracted from the similarly determined temperature for the heat affected zone. This difference shall be used in 2.1 (h) above as the adjustment temperature. The adjustment temperature shall be added to the highest nil ductility temperature (RTNDT) temperature established by the tests from the original construction Code for all of the base material to be welded by this procedure in production.