CPSES-200502474, Relief Request C-1 to the Unit 2 Inservice Inspection Program Plan from the 1998 Edition of ASME Code, Section XI, Through 2000 Addenda (Interval Start Date - August 3, 2004, Second Interval)

Relief Request C-1 to the Unit 2 Inservice Inspection Program Plan from the 1998 Edition of ASME Code,Section XI, Through 2000 Addenda (Interval Start Date - August 3, 2004, Second Interval)

ML053430215
Person / Time
Site:	Comanche Peak
Issue date:	12/02/2005
From:	Blevins M, Madden F TXU Generation Co, LP, TXU Power
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CPSES-200502474, TXX-05203
Download: ML053430215 (8)

Text

. I @ TX.U Power TXU Power Mike Blevins Comanche Peak Steam Senior Vice President &

Electric Station Chief Nuclear Officer P.O. Box 1002 (EO1)

Glen Rose, TX 76043 Ref: 10 CFR 50.55a(g)(5)(iii)

Tel: 254 897 5209 Fax: 254 897 6652 mike.blevins~txu.com CPSES-200502474 Log # TXX-05203 File# 10010 December 2, 2005 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NO. 50-446 RELIEF REQUEST C-I TO THE UNIT 2 INSERVICE INSPECTION (ISI) PROGRAM PLAN FROM THE 1998 EDITION OF ASME CODE, SECTION XI, THROUGH 2000 ADDENDA (INTERVAL START DATE - AUGUST 3,2004, SECOND INTERVAL)

TXU Generation Company LP (hereafter TXU Power) has determined that certain inspection requirements of ASME Section XI are impractical due to physical interferences and is requesting relief pursuant to 10 CFR 50.55a(g)(5)(iii).

TXU Power requests approval of the proposed Relief Request (RR) by the NRC staff.

The attached RR is for a component that did not meet the examination coverage criteria of ASME Subsection IWC-2500. TXU Power has reviewed the inspection documentation and determined that the high percentage of examination volume completed and the lack of any recordable indications establishes a high level of confidence in the continued structural integrity of the component.

A4ti7 A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

• Comanche Peak

• Diablo Canyon

• Palo Verde

• South Texas Project s Wolf Creek

TXX-05203 Page 2 of 2 This communication contains no new licensing basis commitments regarding Comanche Peak Steam Electric Station (CPSES) Unit 2.

TXU Power requests approval of this relief request by December 1, 2006. The approval date was administratively selected to allow for NRC review. If you have any questions or need additional information regarding this matter, please feel free to contact Jack Hicks at (254) 897-6725.

Sincerely, TXU Generation Company LP By: TXU Generation Management Company LLC Its General Partner Mike Blevins By:  ?)1{2' -

ed W. Madden Director, Regulatory Affairs JCH Attachment c- B. S. Mallet, Region IV M. C. Thadani, NRR Resident Inspectors, CPSES T. Parks, Chief Inspector, TDLR

Attachment to TXX-05203 Page I of 6 TXU Power Comanche Peak Steam Electric Station (CPSES), Unit 2 Second 10-Year Interval Relief Request C-1 Proposed Alternative in Accordance with 10 CFR 50.55a(g)(5)(iii)

Inservice Inspection Impracticality I. System/Component for Which Relief is Requested:

Excess Letdown Heat Exchanger, Head to Flange Weld (TCX-2-1 110-1)

II. Code Requirement for Which Relief is Requested:

At the time of the examination, CPSES Unit 2 was required to perform inservice examination of selected welds in accordance with the requirements of 10 CFR 50.55a, and ASME Code,Section XI, 1998 Edition through 2000 Addenda. The Code invokes the examination volume requirements of Figure IWC-2500- 1.

The subject weld is a full penetration weld and requires 100% volumetric examination of the head to shell weld per Table IWC-2500-1, Examination Category C-A, Item No. C1.20.

III. Impracticality of Compliance:

Interferences from the heat exchanger inlet and outlet nozzles and from the flange taper precluded ultrasonic examination of the volume required by Figure IWC-2500-1. Approximately 25% of the required weld volume did not receive the full code required examination volume. The examination included axial and circumferential scans in both directions. Examination coverage was 100%

circumferentially in both directions and approximately 50% in both axial directions. Refer to attached pages 3 through 6 for weld location and examination area configuration for weld TCX 1I10-1.

There were no recordable indications identified by the volumetric examination performed on the accessible portion of the weld volume.

IV. Burden Caused by Compliance:

The examination coverage is limited by physical interferences from the heat exchanger inlet and outlet nozzles and from the flange taper as indicated in the attached pages. These conditions make 100% examination coverage impractical for this weld. In order to gain access to this weld for examination purposes, the heat exchanger would require a design modification. Imposition of this requirement would be a significant burden to TXU Power.

Attachment to TXX-05203 Page 2 of 6 TXU Power Comanche Peak Steam Electric Station (CPSES), Unit 2 Second 10-Year Interval Relief Request C-1 (continued)

Proposed Alternative in Accordance with 10 CFR 50.55a(g)(5)(iii)

Inservice Inspection Impracticality V. Proposed Alternative and Basis for Use:

There are no proposed alternatives. TXU Power has examined a significant portion of the weld, obtaining approximately 75% coverage of the weld.

The subject weld was examined to the maximum extent possible. Based on the high percentage of the examination volume completed and the lack of any reportable indications, there is a high level of confidence in the continued structural integrity of the weld. There is no anticipated impact upon the overall plant quality and safety and the granting of the relief should not jeopardize the health and safety of the public.

VI. Duration of Proposed Alternative:

This relief is requested for the Comanche Peak Steam Electric Station Unit 2 second interval.

VII. Precedent:

1) Comanche Peak Unit 2 (Reference SER dated December 28, 1995, TAC No. M93334)

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NOTES: DESCRIPTIONt CS EXCESS LETDOWN HX TU ELECTR IC (TUBESIDE) .750-OSA-240 (SHELLSIDE).322x/SA-106 CPSES UNIT 2 INSERVICE INSPECTION LOCATION ISOMETRIC I

APPROVAL: f sw a' I ______ ___-_-__ _ _ TCX I10 IREV. I 1 09-01-94 x-O^s^.

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PDI Calibration Data Sheet 4-q O00 Plant/Unit COMANCHE UNIT 2 Data Sheet # 8UT12 I - - I _~~~ I Company WESDYNE Page of 3 . 6If -I--I _1 -rI____ >.

Comp/System cS EXCESS LEToowN HX I I _. I Procedure No. TX-ISI-214 Cal. Checks Time I I _ _ __ _ _I Rev/Chng. No. 3 / NIA Initial Calib. 0912 I I - - _~~ . . .}sX Wo Cal. Block No. TBX-08 Initial Calib. Date 04/02/05 I I I _W III Cal. Block Temp. 63F Comp.Temp. 770F Intermediate N/A 6El Therm S/N TU 2361 Intermediate N/A _ F_-I I'I I I IT'___

Size 8.0" Sch. 140/ 812' "T Final Calib. 1423 EFerritic lXJ Austenitic Final Calib. Date 04/02/05 Each Major CRT Div. = .47 1.27" Search Unit #1 Search Unit #2 Cal.Direction Axial Circ. X Both Couplant Manufacturer KBA Manufacturer: MEGASONICS Scan Area: I to Weld Type: ULTRAGEL II Serial No.: 0145RV Freg.:2.25 MHz Serial No.: P0520 Freg.:2.25 MR PI to Weld Batch: 03125 Size: .375" Shape: ROUND Size: 2 (0.14x0.30) Shape: RECT.

Exam Anqle: 45* Model: MSWQC Exam Angle: 70' Model: CGD Recordable Measured Angle: 45' Measured Angle: 70*

Access Indications Exam Sens. Wedge Style: MSWQC Wedge Style: INTEGRAL Examination Area/Weld Yes No Geom Search Unit Cable Search Unittable TCX-2-1 110-1 1-SIDED X . Type: RG-174 Type: 2 (RG-174)

- Length: 6_ No. of Connecters 0 Length: 6 No. of Connecters 0

. .- Instrument Settings Instrument Settings

_ Make/Model: KBA / USN-52R Make/Model: USN-52R Remarks/Reasons for Inco mplete Scan(s) Serial No: 009404 Serial No: 009404 Delay: 5.613 ps Range: 4.776" Delay: 4.765 us Range: 2.7"

• EXAM SENSITIVITY 45-*47.6 dB /70' RL 60.6 dB Mu CalNel: .1239 ps Pulser: SINGLE M't CaWel: .2301 ps Pulser: DUAL 25% NOT EXAMINED DU E TO NOZZLES. SEE PSI DATA. Damping: 1000 () Reject: 0% Damping: 1000 0 Reject: 0%

NOTE: LOW AMP. ID GE OMETRY ON CIRC. SCAN FROM DIVIDER Rep. Rate: HIGH Freq.: 2-8 MHz Rep. Rate: HIGH Freq.: 2-8 MHz PLATE, VERIFIED ON MekNU)iACTURER DRAWING. Filter: FIXED Mode: FULLWAVE Filler: FIXED Mode: FULLWAVE Examiners: PAUL BLECl- 11 Date Ivel 04/02/05 Reference Sensitivity (Sens.) Reference Sensitivity (Sens.)

Axial: 25.6 dB Circ. 31.6dB Axial: 54.6 dB Circ. N/A Level N/A Date N/A SDH Sensitivity: N/A DH Sensitivity: NMA N/ARei we :I Reviewer: goK an~~ Date FtFurther Evaluation Required', Yes No Tt FJecttle ltmkIm/ Date 1.eI fit Reiew I Date Aad'91 6 r 4hlor 4/q/elc~Sr c-7A],.- 1.5b t(;-

0 >

PROFILE OF THE EXAMINATION 12 9

!EPORT NO. 8UT12 STATION COMANCHE PEAK UNIT 2 PAGE 7. OF 3 " 8 ff 1-011, a

iYSTEM CS EXCESS LETDOWN HX COMPONENT HEAD TO FLANGE DRAWING NO. TCX-2-1110 IDENT NO. 1 0 PROFILE SECTION f-A DIAMETER 8.0" WELD LENGTH 25.2" CROWN WIDTH 1.2" CROWN HEIGHT 0.1" LONG SEAM LOCATION(S) N/A 0

CENTERLINE WELD HEAD FLANGE

.76" .76" .76" .76" .84' .80' .90" 1.1" 1.3"

+ 1n2 . 1" 4112" TOE CIL TOE

• 12" + 1"

• 112' UPSTREAM FLOW DOWNSTREAM MEASUREMENTS START AT CIL OF THE WELD, THEN TOE OF WELD AND THEN liT FROM TOE. *1" AND .1 lIr ON BOTH SIDE OFWELD ASAPPLICABLE PROFILE EXAM COMMENTS PROFILE TAKEN AT 45S COVERAGE ACHIEVED SECTION XI x RISK INFORMED AUGMENTED PREVIOUS DATA REVIEWED YES TYPE UT EXAMINER Paul S. Blecha DATE 04102105 EXAMINER - _ ///x DATE /

REVIEWER $Z 5? DATE REVIEWER DATE e ./Q?

cT. 744 u-/7dY.5-

I Attachment to TXX-05203 Page 6 of 6 WESTINGHOUSE NUCLEAR SERVICE DIVISION INSPECTION SERVICES LIMITATION TO EXAMINATION PLANT COcrnAkCHE 1Rk - UNIT a_ _ SKETCH TCX - ' //O P Ji. 0 SYSTICOMP ExCeSm LETfOptJ PEAT rcmiyg PROCEDURE TX'SI pOC rE I EXAMINER AA4. 1 ei DATE a -. c -_0 0 EE3 I I RELATED TO: U/T. .X.P/T M/T VIT ITEMIS3 L)ELO I PROVIDE GENERAL INFORMATION TO DESCRIBE APPROXIMATE SIZE. LOCATION AND TYPE OF LIMITATION.

-4 EXAMISCAN SURFACE AREA

-DIRECTION 7 IOR0 R."5J' !oI 1 30 SURF.'

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