ML19350C689

Interim Significant Deficiency Rept 80-03 Re Linear Indications in Gib Gusset Welds in Reactor Vessel Structural Support,Initially Reported 810312.Vessel Will Be Moved from Point of Barge Delivery to Installed Location

ML19350C689
Person / Time
Site:	Beaver Valley
Issue date:	03/30/1981
From:	Woolever E DUQUESNE LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
2DLC-4002, NUDOCS 8104060606
Download: ML19350C689 (6)

Text

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March 30, 1981

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United States Nuclear. Regulatory Commission Q Office of Inspection and Enforcement p 1 Region I

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. ATTENTION: MR. BOYCE H. GRIER, DIRECTOR k

SUBJECT:

Beaver. Valley Power Station - Unit No. 2 Docket No. 50-412

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Linear Indications in Gib Gusset Welds it. Reactor Vessel Structural Support (Neutron Shield Tank)

Significant Deficienty 80-03 Gentlemen:

Refer to your letter dated March 5, 1981, on the subject of an NRC Independent Nondestructive Examination of the Beaver Valley 2 Neu.ron Shield Tank at - the Babcock'& Wilcox facilities in Mt. Vernon, Indiana. Following initial conversations with our Principal Inspectcr, Mr. R. Feil, March 10, 1981, a telephone ' conference call was arranged on March 12, 1981, between Messrs.

Sanders and Walton of the NRC and repr :dentatives of Stone & Webster, Babcock &

Wilcox and ourselves.

Inz accordance with your. requirements and as confirmed during the

' conference call, we are transmitting to Mr. Thomas T. Martin, Chief, Engineering Inspection Branch, the procedures and drawings' referenced in your letter under separate cover at a later. date. Appendix 1 to this letter shows the . details of

.the procedures and drawings originally and previously used for the examination of this~ vessel, and comments that may assist your staff in their review and use.

During the conference call, the present situation'of the vessel was discucsed in detail;-in summary, the vessel is considered to be inaccessible for

'the type of independent NDE examinations described without an adverse impact on the production activities. It is heavily scaf folded both inside the vessel and

, in the pit / vessel annulus in order to support a. working platform for the repair of the gibs:and. gussets presentlr i being performed. A further complication is that'the vessel ~is-subject to tamperature, and is cxpected~to remain in this

. condition for a considerable period of time.

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We considered that there would be a suitable time frame between the end of the basic repair activity and the post-weld heat treatment phase. During this period, our Contractor will be performing repairs designated by Noncon-formance and Disposition Reports initiated at the Beaver Valley Unit 42 Site.

During this time frame, the vessel will not be subject to continual preheat conditions and will also be more suitably scaf folded for your staff to perform the examinations they require.

Our basic estimate of the time frame at the time of the conference was sometime in August, 1981. We would emphasize, however, that this time frame could move to an earlier date, dependent upon the progress made by our Contractor, or a later date, dependent upon problems being found during the repair process. It was our understanding that subject to concurrence by the appropriate departmental management at the NRC, two weeks' notice of such a change in tine frame would be sufficient for your NDE group to be assigned to the Mt. Vernon ficility.

During the conference call, various possible contractual and/or legal problems were briefly discussed. These problems relate to local agreements entered into by our Centractor, radiation safety during any radiography performed by your group, associated liabilities, scheduling, and other related matters. In consequence, a letter has been transmitted to Babcock & Wilcox on March 18,1981, formally advising them of your intentions, and requesting them to provide us with any concerns with respect to commercial, legal and scheduling considerations relative to your activity. On receipt of their response and position, any problems they foresee will be reviewed by us and, if necessary, brought to your attention for discussion and mutual resolution.

As discussed in the conference call, we reiterate the importance of the installation of the repaired vessel; st is a controlling activity on the critica1' path of the project. Currently, we intend to move the vessel directly from the point of barge delivery to its final installed location. For this reason it is essential that the maximum coordination between the parties involved is achieved, and we will assist in any way in optimizing the coor-dination of your intended NDE activities to prevent any delay to the project.

We trust the approach we have taken meets with your satisfaction, and, if you have any further questions, please contact the undersigned.

DUQUESNE LIGHT CCMPANY By: &f kr(fy/

E. J. Woolever Vice President

-Attachment-cc: Mr. V. Stello, Director (15)

Office of Inspection and Enforcement U.S.' Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Thomas T. Martin, Chief (1)

Engineering Inspection Branch U.S. Nuclear. Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

3 e --. Page 1 of 4 SU3JRCT: Beaver Valley Power Station Unit 12 Docket No. 50-412 Linear Indicatiens in Gib Gusset Welds in Reactor Vessel Structural Support (Neutron Shield Tank)

Significant Jeficianty 80-03 Independent l'on-Cer.cructive Examination of the Neutron Shield Tank at the Bacccck & Wilcox Facilities in Mt. Vernen, Indiana APPE'.' DIX 1 INDEX OF PROCEDURES LiiD DRr4INGS

1. Non-Destructive Exa ination Proced'r * '- used by Newport News Industries:

DATE DESCRIPTION NUMBER REV. S &'J FILE NO .

-1.1 3/21/78 Magnetic Particle Inspection N-320/420 C1  % 610/009/001D Procedure 1.2 5/1/78 Magnetic Particle Inspection N-320/420 C2 2602.610/009/001E Procedure 1.3 7/17/78 Magnetic Particle Inspection N-320/420 C3 2603.610/009/0017

-Procedure 1.4 6/26/73 Liquid Penetrant Inspection N-330/430 E 2603.610/009/002F Procedure

'l.5 -7/17/ 8 Liquid Penetrant Inspection N-330/430 El 2603.610/009/002G Procedure 1.6- 4/13/78 Ultrasonic Fva-ination Procedure 203-7-241 I 2603.610/009/017C 1.7 9/1/76 Radiographic Procedure N-342/442/ Al 2603.610/009/003C (Technique) 542

• 1.8 6/25/76 -Radiographic Procedure N-343/443/ A 2603.610/009/0063 (Acceptance) 543

• NOTE: RT Procedure 343/443/543, Rev. A, refers to our Equip =ent Job Nu=ber, J.O. 5031-A, which directs the examiner to Appendix J for acceptance standards.

2. Non-Destructive Exa,1 ation Procedures used by Duquesne Light Coupany and/or Stone & Webster at the Beaver Valley Unit #2 Site:

DLC/SQC 2.1 Radio rachy - DLC/SQC utilized Newport News Industries Radiographic Procedure.N-342/442/542, Revision Al and N-343/443/543, Revision A -

Appendix J, for its re-radiography of welds on the vessel in order to si=ulate conditions applied in the original radiography.

DATE DESCRIPTION NL73ER 2.2 9/5/73 Magnetic Particle. Inspection MT-10 General Require =ents

.1/15/S0 Magnetic Particle Inspection MT-10 General Require =ents ,

APPENDEX 1 Page 2 of 4 I DATE DESCRIPTION NUMBER 2.3 8/15/79 Magnetic Particle Inspection MT-11 Dry Powder Method 9/23/80 Magnetic Particle Inspection MT-11 f- Dry Powder Method 10/17/80 Magnetic Particle Inspection MT-11 Dry Powder Method 2.4! 11/1/79 Liquid Penetrant Inspection PT-10

-12/2/80 Liquid Penetrant Inspection PT-10 2.5 8/13/80 Ultrasonic Inspection -

Investigative - per N&D #1396 NOTE:- Radiography was perfor=ed as part of a verification program of radiography previously perfor=ed by NNI. The MI examinations were perfor=ed in response as par of the disposition of various

-N&D's. Liquid Penetrant was utilired to confir= and/or investigate certain MT indications as part of the investigation.

Stone-& Webster-DATE DESCRIPTION NLIMBER 26 11/1/79 Ultrasonic Inspection QAD-9.54 0 NOTE: UT Procedure QAD-9.54, Rev. 0, was utilized on a 5% rando=

inspection' basis at the 7" ring and shell to 7" ring.

3. l Assembly Drawings Weld Joint Design and. Weld Locations WeldcJoint Identification Drawings:

REV. S&W FILE'NO.

• 3.1 ~ -249586- ~F .200.3.610/009/023E 3.2 249587- E- 200.3.610/009/024F 3.3 ' 249588: :A: '200.3.610/009/0253

-* NOTE: EThis drawing shows original NDE require =ents.

LWeld Joint Design Drawines

( 3. 4 , L249575 K 200.3.610/009/027G'

> : 3.5 ~ 249577 H' 200.3.610/009/029fi i

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.c -.; APPENDIX 1 Page 3 of 4 3.6. 249578 G 200.3.610/009/030F 3.7 249579 D 200.3.610/009/031D

.3.8 '249580 H 200.3.610/009/032F

~3.9 249581- E 200.3.610/009/033E 3.10 249583 E 200.3.610/009/034D

4. Weld Procedures Newport News Industries DATE DESCRIPTION NUM3ER REV. S&W FII E NO.

4 ~1 5/29/78- . Standard Operation Precedure 062-19.72 D 260.3.610/009/004I 4.2 10/6/78 -

062-19.72 D-1 260.3.6'10/009/023A 4.3 110/17/78 062-19.72 D-2 260.3.610/009/024A 4.42 8/30/68 PQR 122-110-?HISPI 260.3.610/009/013A 4.51 8/1/68 ~PQR; 122-110-?HI 260.3.610/009/014A 4.6 10/14/77.1?QR 701.1-5N A 260.3.610/009/0153 4.7 '-10/14/77: PQR. 122-110-?HII A 260.3.610/009/0163

'4 . 8 12/15/77 PQR ?01.4-3N- 260.3. 610/009 /019A 4.9 6/7/78 Post Wald Heat Treat.ar: 'NNI.19-900 .A 260.3.610/009/0223

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Beaver Valley-Unit #2 ~ Site Weld ~ Procedures - Tech. Sheets and PQR's

' Extracted from Schneider Inc. SPSV-100, Revision 10 DATE" - DESCRIPTION FILE NO.

-4.10' 4/21/80 Tech'. Sheet WPTS-S?37-705F -(y?QR) 2606.260-920-300J

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T4.11 '4/21/80  ; Tech. Sheet WPTS-S?3V-705M (+?QR) 2606.260-920-800J

-NOTE: ; Weld' Procedure. Technique Sheet #705F was used for the skire to-base. ring repairs and trunnion pads; Sheet #705M was used for ~weldingLthe =inor excavations on the shell perifery.

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APPENDIX 1 Page 4 of 4

-5.- Schedule of Work Activities at 3G 5.1 critical Path - Neutron Shield Tank - Revision 1 dated 1/20/81 NOTE: Tais schedule has been submitted to fulfill your request and to

- give a general overview of the repair program only. The schedule

-is currently under revision to give a = ore accurate reflection

. of the sequence and to include the post weld heat treat =ent phase

- which is not shown on the original and also the possibility of a pre-delivery painting activity which is still under discussion.

Toldate, the =ajor change in sequence relates to the welding of the' gibs and gussets. On receipt of a more accurate schedule, a; copy will be forwarded. -It is requested that this schedule

- is not used as a vehicle for the selection of the ti=e frame for the NRC NDE activities and the various =arkings on the schedule should be ignored.

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