ML20249B612

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Forwards Request for Relief from Specific Requirements of Article IWA-4000 of ASME Section XI Code,1980 Edition,W/ Addenda Through Winter 1981 Addendum.Approval Needed in Order to Install Temporary non-code Repair on HPCI Sys
ML20249B612
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 06/17/1998
From: Geoffrey Edwards
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9806230376
Download: ML20249B612 (20)


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y,y June 17,1998 Docket No. 50-277 License No. DPR-44 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

Peach Bottom Atomic Power Station, Unit 2 HPCI Suction Drain Line Proposed Non-Code Repair

Dear Sir:

In accordance with 10 CFR 50.55a (g) (6) (i), attached (see Attachment A) for your review and approval is a request for relief from specific requirements of Article IWA-4000 of the ASME Section XI Code,1980 Edition, with Addenda through Winter 1981 Addendum.

Approval of this relief request is needed in order to install a temporary non-code repair on the High Pressure Coolant Injection (HPCI) System for the Peach Bottom Atomic Power Station (PBAPS), Unit 2. This issue was discussed in conference calls between PECO Energy Company (PECO Energy) and the U. S. Nuclear Regulatory Commission (USNRC) staff on June 15 and 16,1998. As described in the attached request, PECO Energy is requesting approval on an expedited basis to restore the HPCI system to operability and obviate the need to shut down the Unit.

Ifyou have any questions, please contact us.

Very truly yours, j ,

Garrett D. Edwards Director, Licensing (

' 7 Enclosure cc: H. J. Miller, Administrator, Region I, USNRC A. C. McMutray, USNRC Senior Resident Inspector, PBAPS CCN 98-14049

.v;:0 9006230376 980617 PDR ADOCK 05000277 p PDR

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. Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 1 of 8 Peach Bottom Atomic Power Station Unit 2 High Pressure Coolant Injection (HPCI) Pipe Leak Proposed Relief from ASME Section XI Code Requirements

Background

On June 11,1998, a through-wall leak was identified in a 1" drain line off of the Unit 2 HPCI pump suction line. The leak is at a socket weld connection where a 1" drain line connects to a half coupling attached to the 16" pump suction piping (see Figure 1 for plant configuration). The leak rate through the flaw is estimated )

to be approximately 19 drops per minute.

In accordance with Section 6.15 (" Operational Leakage") of Part 9900 of the NRC Inspection Manual (" Operable / Operability: Ensuring the Functional Capability of a System or Component"), the HPCI System was declared inoperable on June 11, 1998 as a result of the discovered indications discussed below. Declaring the HPCI I System inoperable resulted in entering PBAPS Unit 2 Technical Specification Required Action C.2. This action requires that the HPCI System be restored to the ,

operable status within 14 days. Upon conclusion of the 14 day required action, if  !

operability is not restored, the plant is required to be in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, and reactor steam dome pressure reduced to less than or equal to 150 psig within  ;

36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.  ;

l 1

Obiective  !

In accordance with 10 CFR 50.55a (a) (g) (5) (iii), PECO Energy Company (PECO Energy) has determined that conformance with certain Code requirements is impractical to achieve under current plant conditions. Accordingly, approval of relief from these Code requirements , in accordance with 10 CFR 50.55(g) (6) (i) is requested. Specifically, Article IWA-4000 of the 1980 Edition with Addenda through the 1981 Addendum of Section XI of the ASME Code describes the Code repair process. A Code repair requires the removal of the flaw and a subsequent weld repair. As also discussed in Generic Letter 90-05 (" Guidance for Performing Temporary Non-Code Repair of ASME Code Class 1,2, and 3 Piping"), for ASME Code Class 2 piping, a licensee is required to perform Code repairs or request USNRC to grant relief for temporary non-Code repairs on a case-by-case basis regardless of pipe size. The HPCI System is considered ASME Section XI Code Class 2 piping. Therefore, as discussed below, PECO Energy is requesting approval to install a temporary non-Code repair on an expedited basis to obviate the need to shutdown PBAPS, Unit 2. A permanent repair / replacement will be

o

. Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 6 of 8 The repair consists of a 2" ASTM A-106 Gr.B schedule 160 pipe which will encapsulate the 1" piping (including the flaw indication). All welds have been qualified for system design pressure ratings and stresses. Attachment B of this submittalis provided to document the structural integrity evaluation of the repair design.

Material All materials associated with the repair are consistent with original construction code requirements and ASME Section IX approved materials for welding. The following is a list of existing drain line and repair materials:

Item Material 16" Suction Piping Seamless Carbon Steel pipe, ASTM A-106, Gr. B,0.375" wall 1" Half Coupling 3000# socket weld, ASTM A-105 1" Drain Pipe Seamless Carbon Steel pipe, ASTM A-106, Gr. B, schedule 80 1" Drain Valve Body CarbonSteel, ASMESA-105 Welded Clamp Body Seamless Carbon Steel pipe, ASTM A-106, Gr. B, schedule 160 Plug 1/8" NPT, ASTM A-108 Welding All welding will be performed utilizing existing station procedures provided as Attachment C of this submittal.

During initial discussions with the USNRC on June 15,1998 and June 16, 1998, regarding the proposed repair, specific information regarding PECO Energy weld procedures and water backed welding were requested. The following discussion documents our reply to this initial inquiry.

. Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 2 of 8 performed during the upcoming PBAPS, Unit 2 outage currently scheduled for October,1998.

Basis for Request Code Repair The subject flaw is located in a drain line between the torus penetration and the suction line isolation valve. Since no isolation valve exists to block the o source of water from the torus, a Code repair could not be implemented with the unit in operation. A Code repair which requires flaw removal must be implemented with the suction line blocked from the torus strainer or a freeze seal applied to the suction piping outside the torus. Both of these options could not be implemented in the allowable out of service time for primary containment. Therefore, a plant shutdown would be required.

A final Code repair / replacement of the drain line defect will be performed during the next refueling outage scheduled for October 1998.

Consideration of Other Repair Options The use of other methods to address the leak on the HPCI drain line was considered. ASME Code Case N-523-1, " Mechanical Clamping Devices for Class 2 and 3 Piping, was determined not applicable to this application due to an exclusion in its scope related to repairs of items involving the containment boundary. Discussions with personnel who had been involved with the ASME work on this Code Case led to the understanding that the reason for this exclusion from applicability relates to the Code Case's objective to only control , as opposed to preclude leakage. As a parallel effort, however, PECO Energy investigated the availability of mechanical clamping devices and determined that such a device was not readily available for this application / configuration. Therefore, based on the limitations of Code Case N-523-1, and the technical attributes of the welded clamp repair, it was concluded that the requested welded repair technique is the preferred option.

Proposed Temporary Repair Authorization to install a temporary non-Code repair will provide an acceptable level of quality and safety, and eliminate the hardship and unusual difficulty that would result from shutdown of PBAPS, Unit 2. The proposed temporary non-Code repair has been designed to ensure the continued integrity of the piping, and ensure that the system adequately L _ _ _ _ _ _ _ _ _ - _ _ . _ _ _ - _ _ _ _ - _ _ _

. Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 3 of 8 E

performs its safety function until the permanent repair / replacement is

- installed during the upcoming PBAPS, Unit 2 refueling outage currently scheduled to begin in October,1998. Controls over the installation and welding processes have been established to ensure that the installation of the temporary non-Code repair will be performed in a safe and effective manner.

The following additional information and design summary support the request to perform a temporary non-Code repair of the identified flaw in the HPCI drain

~ line.

I' l

Defect Characterization / Root Cause l'

l The flaw is located in the weld connecting a 1" schedule 80 carbon steel (ASTM A-1% Gr.B) drain line to the half coupling (ASTM A-105) attached to the 16" piping header. Initial visual examination identified the leak to be through wall at approximately the toe of the socket weld, on the pipe side of the weld.

l An informational ultrasonic testing (UT) examination was performed on the socket weld. The weld was examined 360 degrees. An O.D. reflector _was detected at the location of the leak with both 45 & 60 degree angle, shear wave, transducers. The indication has an approximate length of .25". The two remaining socket welds on this drain line were inspected and no indications l, were identified.

The apparent cause of the flaw is believed to be vibration induced fatigue.

Although no vibration of the line is observed under normal plant operating conditions, minor vibration of the line has been noted with the HPCI system in operation. Failure analysis will be performed following removal of the flaw during the upcoming refueling outage.

Piping Evaluation l The identified flaw does not reduce the structural capability of the existing drain ,

line in its current condition or with the repair installed. The structural evaluation l of the as-found condition provided in Peach Bottom NCR 98-01471 bounds the l 0.25" length identified by the informational UT examination. The repair design  !

- does not take credit for integrity of the 1" drain piping. Therefore, the flaw size l will have no effect.

l

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Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 4 of 8 The welded clamp repair adds 3 pounds to the l" drain. Pipe stresses due to the additional dead weight are considered to be insignificant. Also, pipe expansion stresses are minimal since operating temperatures are low.

Vibration of the subject piping was considered in the evaluation. The l" drain l line, including the 2" clamp, is judged to be more resistant to vibration induced fatigue since the section modulus increases with the addition of the clamp.

Therefore, the overall rigidity of the drain line is improved.

Additional Monitoring & Augmented Inspection The ongoing monitoring described in Generic Letter 90-05 is not considered necessary since the repair will be leak-tight. Also, periodic NDE of the flaw is not practical because the flaw will be covered by the repair. To provide input to the root cause evaluation of the flaw, vibration data associated with the Unit 2 HPCI pump suction piping will be obtained during scheduled surveillance testing of the HPCI system. Upon ultimate Code repair during the next refueling outage, the subject piping will be examined to complete the root cause evaluation of the through-wallindication.

Auemented Inspection In accordance with Generic Letter 90-05, expanded augmented examinations are being performed to assess the overall condition of the drain line, and to investigate the generic implications of the as-found indication. MT or PT examinations of the remaining drain line welds are being performed. The same drain line on the Unit 3 HPCI system has been walked down with no observable indications. As part of the augmented inspection, welds of similar configuration on both Units 2&3 have been selected for additional MT or 17T inspection.

During performance of augmented inspections on June 17,1998, a linear indication was identified at the half-coupling to 16" HPCI suction pipe weld (the opposite end of the subject half-coupling). This indication is at the toe of the weld, on the 16" pipe side. This indication will be dispositioned in accordance with the requirements of ASME Section XI prior to implementation of the repair proposed in this submittal.

L_____-_______.

Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 5 of 8 Proposed Repair Design Requirements The HPCI pump suction piping was designed in accordance with USAS B31.1-1%7. The piping is classified as ASME Class 2 for inspection in accordance with Regulatory Guide 1.26. The pressure / temperature ratings for the HPCI Pump suction piping are as follows:

Pressure Temperature Design 150 psig 300*F Normal 7 psig 100*F Operating Maximum 70 psig. 170'F j Operating 1 Based on the maximum operating pressure and temperature described in the above table, the subject drain line is considered to be moderate energy.  ;

The repair design has been evaluated against the original construction code (B31.1). 1 The ASME Section XI Code currently applicable to Peach Bottom Unit 2 is the 1980 Edition, including Addenda through the Winter 1981 Addendum.

The welded clamp repair is designed for a 360 ' through-wall flaw.

Therefore, structural integrity and pressure boundary integrity of the line will be maintained, should the crack propagate through the full l

circumference of the weld.

l Clamping Device The proposed temporary non-Code repair is shown in Figure 2. The repair L consists of a welded clamp design which will be placed between the half ,

coupling and the l" drain line valve. The welded clamp design will maintain the system pressure boundary and structurally replace the l" drain piping should the flaw propagate 360 * .

s

Attachment A Peach Bottom Unit 2 HPG Leak Repair Page 7 of 8 The question whether our existing carbon steel welding procedures cover the parameters of the planned repair involve the issue of the effective heat sink from water backed welds. In response the following explanation is offered:

1. Current PECO Energy Welding procedures are qualified to all thicknesses of fillet welds. The effective heat sink of thick materials is similar to welding with water backing. B31.1 does not specify any preheat for materials up to 1 in. thick.
2.Section IX allows welding to be performed without requalification provided that the preheat temperature (in this case 70F) is not more than 100F below the value recorded in the welding procedure qualification record. There are no parameters in Section IX pertaining to heat sink welding. It is based upon the weldability of the materials only.
3. We are not using this procedure for inducing compressive stress in the piping which was the basis for developing this technique for mitigation of IGSCC in stainless steel piping.

Metallurgical Implications of Water-Backed Weldine Extensive testing was performed at the EPRI NDE Center to support the ASME Section XI Task Group development of an overlay repair Code Case for carbon steel. Microstructural analysis was performed on many carbon steel test coupons to determine hardenability. These coupons were welded in a water-backed environment. The hardenability of thin sections when welding with water backing was not significantly greater than when welding without water backing. The results of these tests are contained in an EPRI Repair Replacement Applications Center Final Report entitled,

" Weld Overlay Repair of Erosion and Corrosion Mock-up Testing - Phase II", dated April 20,1995.

Third Party Review of Welded Repair Plan PECO Energy had a third party review of the welded repair plans. Welding Services, Inc. (WSI) performed an independent assessment of PECO's technical position with respect to the water-backed welded repair. WSI concurred with the repair technique from a welding procedure and implementation standpoint.

Attachment A Peach Bottom Unit 2 HPCI Leak Repair Page 8 of 8 Repair Mock-up To demonstrate proper fit up and the ability to perform all welds required by design, an installability mock-up was performed on June 15,1998. This mock-up was performed satisfactorily.

An additional mock-up repair is currently being performed. A drain line was fabricated and will be filled with water during welding. A flaw was induced into the mock-up drain line to simulate actual field conditions and test the ability to maintain the weld area dry by scaling the flaw to prevent water from seeping into the weld area. All clamp welds are to be made, and associated NDE performed to demonstrate the welds to be satisfactory.

Any unexpected results will be properly addressed.

NDE & Pressure Testing Magnetic Particle (MT) or Liquid Penetrant (PT) testing will be performed .

on the completed welds. Although welded repairs of piping 1 inch nominal pipe size and smaller are exempt from the Section XI post-repair pressure testing requirements per IWA-4400 (b), a pressure test will be performed following installation of the repair clamp.

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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . ._____ ___ ____________ - __________ ___ a

, ~TMCMM6 M h ELDING PROGRAM c.

[, p.9^+.f4 7 WELDING P OCEDURE. SPECIFICATION EXHIBIT 9.3

. ssRvicE DOCTYPE 793 46f g' SHEET 1 OF 2 WPS NO. :E1.1-C REVISION NO. : 0_ .

SUPPORTING PQR :E1.1-E-2" PROCESS (ES) :SMAW TYPE (S): Manual PREPARED BY: [ te: Ay g APPROVED BY: g Ogb Date:

g ,

JOINTS (QW-402)

Joint Design :See GWP Dara. 10.1.4, .7, .8, .10, .12, .13 BASE METALS (QW-403) -

P No. :1 Group No. : A_1_1 to P No. :1 Group No. :b_11 Thickness Range: Groove :1/16"-0.686" Fillet :All Pipe Dia. Range: Groove.: All Fillet :All Other :No nonmetalic or nonfusine metal retainers used FILLER METALS (QW-404)

F-No. :1 Other :None A-No. :1 Other :None Spec No. (SFA) :5.1 AWS No. (Class) :E7018 Si::e of Filler Metals :3/32"-1/8" -

Electrode Flux (Class) :EZh Flux Trade Name :EZA Qualified Deposited Weld Metal Thickness (es) (t) :

0.686" Consumable Insert : Ho_.t to be used Other :No pass thicker th'an 1/2" POSITIONS (QW-405)

Qualified Positions Groove : All Weld Progression : Up :ves Down :p_o Fillet:h.11 Other :Nono

                                                                                                                                                • v PREHEAT (QW-406) ,

r Preheat Temperature (Minimum) :5.0 Degrees F.  !

l/ Interpass Temperature (Maximum) :400 Degrees F.

Preheat Maintenance : Immediately Before Weldina l

l Other :None ,

e*

p

. ' Amce, c, WELDING PROGRAM

. q+d Nee4 W PR DURE SPEC EXHIBIT 9.3 4 . SE RVICE **

DOCTYPE 793 cy g' SHEE"" 2 OF 2 WPS NO. ': E1.1-C REVISION NO. : 0_

POSTWELD HEAT TREATMENT (QW-407)

Temperature Range :None .

Degrees F. -- - - - -

Time Range :E/_&

Other :None GAS (QW-408)

Shielding Gas (es) :None  % Composition (Mix) :E/_A Flow Rate :E/_4 Gas Backing :N/A Flow Rate:N/A Trailing Shielding Gas Composition :Not to be used Other :None l l ELECTRICAL CHARACTERISTICS (QW-409) l Tungsten Electrode Size and Type :M l Mode of Metal Transfer for GMAW :E/_h l Electrode Wire Feed Speed Range :E/_&

Other :None _

Fillers Dia. Current Amps Volts Travel Speed 4 IPM IPM ,

l IPM

~

E7018 3(32 DCRP 65-95 15-24 5-7 l E7018 1/8 DCRP 95-140 23-28 5-6 IPM IPM

--- --- --- --- --- --- IPM i l

TECHNIQUE (QW-410) l Stringer or Weave Bead :Strinacr and weave Orifice or Gas Cup Size :H/_Ah Initial and Interpass Cleaning : Grind and/or wire brush Method of Back Gouging :If used crind and/or wire brush Oscillation :Four times core wire dia:ceter manmta Contact Tube to Work Distance :N/A Multiple or Single Pass (per side) :Multiole Multiple or. Single Electrode : Sincie ,

Travel Speed Range : See matrix above '

j Peening :Not Dermitted l Other :E/_A O

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  • hg WELDIND WELDING PROGRAM

. *:smned" . PROCEDURE Exhibit 9.1 l r>

QUALIFICATION RECORD Page 1 of 3 DOCTYPE 792

\

PQR Number E1.1-E-2" Revision Number 3 l WPS Date 8/10/83 )

Original WPS E1.1-E-2" l Process (es) SMAW Type (s) Manual  ;

JOINTS (QW-402) .

- w j

% N/r '

=-@ l 1

. p 1 BASE METALS (QW-403) to P No. 1 Group No. 1 Spec SA 106 Gr B P No. 1 Group No. 1 Spec SA 106 Gr B Plate Thickness:'N/A Pipe Thickness: 0.343"

' ' Pipe Dia.: 2" NPS Other No pass thicker than 1/2" FILLER METALS (QW-404)

F-No. 4 other N/A A-No. 1 Other N/A  ;

Spec No. (SFA) 5.1 AWS No. (Class) E7018 Size of Filler Metals 3/32" Deposited Weld Metal Thickness (t) 0.343" Consumable Insert Not Used Other N/A POSITIONS (QW-405)

Position (s) of Groove 6G Weld Progression: Up y.g.p_. Down ng___

! PREHEAT (QW-406) Degrees F l Preheat Temperature (Minimum) Ambient Interpass Temperature (Maximum) 600 Degrees F POSTWELD HEAT TREATMENT (QW-407) Degrees F Temperature Range None Time Range N/A

mycwgC, y 4/r w

WELDIN3 1 WELDING PROGRAM s E'

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  • PROCEDURE Exhibit 9.1 QUALIFICATION RECORD Page 2 of 3 3

i PQR Number E1.1-E-2" Revision Number 3 l GAS (QW-408)

Shielding Gas (es) Nene Mixture % N/A i Shielding Gas Flow Rate N/A l Gas Backing Egne Flow Rate N/A  !

Trailing Shielding Gas Composition None i Other N/A l l

ELECTRICAL CHARACTERISTICS (QW-409)

Current (AC or DC) DC Polarity Reverse Amps (Range)70-120 Volts (Range) 17-23 ,. .

TECHNIQUE (QW-410) )

Stringer or Weave Bead Strinaer and Weave Oscillation Not' Recorded Multiple or Single Pass (per side) Multiole 'j

  • Multiple or Single Electrode Sinale Travel Speed Range 3 to 8 inches / minute TENSILE TEST (QW-150)

Soecimen 1 Suecimen 2 Width or O.D. .743 .758 Thickness or I.D. .290 .255 Area (square inches) .215 .193 Ultimate Load (lbs) 15.225 13.500 Ultimate Stress (psi) 70.814 69.948 Character of Failure ductile ductile Location of Failure base metal base metal GUIDE BEND TEST (QW-160)

Tvoe and Floure Numoer Results

1. Face OW-462.3(a) No Defects
2. Root OW-462.3(a) No Defects

,2, Face OW-462.3fa) Ep Defects

4. Root OW-462.3(a) No Defects

A h C l 4

, A,vwm- C,nW

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7 / #<a WELDING l 1 WELDING PROGRAM  !

f*

! s y* PROCEDURE Exhibit 9.1 QUALIFICATION RECORD Page 3 of 3

(

I PQR Number E1.1-E-2" Revision Number 3 I NOTCH TOUGHNESS TEST (QW-170) i Soecimen i Soecimen 2 Soecimen 3 Notch Location --- ---

Notch Type --- --- ---

Test Temperature --- - --- ---

Impact Values (ft-lbs) --- ---

l Lateral Exp. (% Shear) --- ---

l Lateral Exp. (Mills) --- --- ---

l Drop Weight (Break) --- ---

l Drop Weight (No. Break) --- ---

... p l . . . - - . . _ _ . . . - _ - . , _ . . . . - . - _ . . _ . . . ...... -... . _ ...- -..,. ._ . . . . .

DELTA FERRITE TESTS j Schaeffler Diagram Prediction for Filler Metals N/A l Magnetic Ferrite Indicator Reading for Weld Deposit N/A l Chemical Analysis of Undiluted Weld Metal Deposit N/A i

Welder's Name Ronald Sammler Payroll Number 227404 Symbol 409 (Who by virtue of these tests meets performance requirements) l i l We certify that the statements in this record I

are correct, and that the test welds were prepared, welded, ,

and tested in accordance with requirements of Section IX of l ASME Code Edition and Addenda in effect at the time of PQR  !

Qualification.

l This revised PQR is th'e same as was generated on 5/18/84.

1 Prepared by/Date

/

/ //

Approved by/DateO

, L.&. udWA , .

thaks.

l L________________.____. _ _ _ . .1