RBG-47166, Requests for Relief RBS-ISI-016 & RBS-ISI-017, Requests for Relief from ASME Code Section Xl Inservice Inspection Requirements for Pressure Retaining Welds in Control Rod Housings and Pressure Retaining Welds in Pumps & Valves

Requests for Relief RBS-ISI-016 & RBS-ISI-017, Requests for Relief from ASME Code Section Xl Inservice Inspection Requirements for Pressure Retaining Welds in Control Rod Housings and Pressure Retaining Welds in Pumps & Valves

ML11221A164
Person / Time
Site:	River Bend
Issue date:	08/03/2011
From:	Clark J Entergy Corp
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RBG-47166
Download: ML11221A164 (21)

Text

Entergy River Bend Station 5485 U.S. Highway 61N St. Francisville, LA 70775 Tel 225-381-4157 Joseph A Clark Manager, Licensing RBG-47166 August 3, 2011 U. S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555-0001

REFERENCES:

River Bend Station, Unit 1 - Requests for Relief RBS-ISI-016 and RBS-ISI-017 Requests for Relief from ASME Code Section Xl Inservice Inspection Requirements for Pressure Retaining Welds in Control Rod Housings and Pressure Retaining Welds in Pumps and Valves Docket No. 50-458 License No. NPF-47

1. NUREG-0989; "Safety Evaluation Report Related to the Operation of River Bend Station," Supplement 3, Appendix L, Dated May 1984.

2. NRC Letter; "River Bend Station Unit 1-Evaluation of Relief Requests For Second Ten-Year Interval Pum and Valve Inservice Testing," Dated March 9, 2000 (TAC No. MA4546)

Dear Sir or Madam:

Pursuant to 10 CFR 50.55a, "Codes and Standards," paragraph (g)(5)(iii), Entergy requests relief from certain American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPV), Section Xl, Sub Article IWB-2500 Inservice Inspection (ISI) requirements for Examination Category B-O, Pressure Retaining Welds in Control Rod Housings and Examination Category C-G, Pressure Retaining Welds in Pumps and Valves. This relief is requested for the second 10-year interval of the Inservice Inspection Program for the River Bend Station (RBS).

These requests for relief are being submitted beyond the 12 month timeframe following the second 120 month interval as specified under 10 CFR 50.55a(g)(5)(iv). This condition has been addressed in Entergy's Corrective Action Process.

In accordance with 10 CFR 50.55a(g)(6)(i), the proposed relief to the referenced requirements may be approved by the NRC giving due consideration to the burden upon the licensee that could result if the requirements were imposed on the facility. Entergy believes full compliance with the ASME Code, Section Xl requirements is not practical.

The specific details of the requested relief are enclosed in Attachment 1 and Attachment 2.

A01~b

RBG-47166 Page 2 of 2 The NRC previously granted relief for these examinations in the Safety Evaluations listed as References 1 and 2 above.

There are no new commitments in this letter.

If you have any questions concerning this letter, please contact me at (225) 381-4177.

Respectfully'y Manager, Licensing River Bend Station - Unit 1 JAC/bmb Attachments:

1. Attachment 1 - Second 10 Year Interval Inservice Inspection Program Request For Relief - RBS-ISI-016

2. Attachment 2 - Second 10 Year Interval Inservice Inspection Program Request For Relief - RBS-ISI-017 cc:

Regional Administrator U. S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 NRC Senior Resident Inspector P. 0. Box 1050 St. Francisville, LA 70775 U. S. Nuclear Regulatory Commission Attn: Mr. Alan B. Wang MS 0-8 B1 Washington, DC 20555-0001 Department of Environmental Quality Office of Environmental Compliance Radiological Emergency Planning and Response Section JiYoung Wiley P.O. Box 4312 Baton Rouge, LA 70821-4312

RBG-47166 Page 1 of 1 RBG-47166 RBF1-11-0104 File codes; G9.5,

ATTACHMENT I TO RBG-47166 RIVER BEND STATION - UNIT 1 SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-016 to RBG-47166 Page 1 of 8 RIVER BEND STATION - UNIT 1 SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-016 Component(s) Affected:

See Table 1 below Code Class:

ASME Code Class 1

References:

ASME Section XI 1992 Edition, 1993 Addenda, Table IWB-2500-1 Inspection Program B Examination Category:

B-O, Pressure Retaining Welds in Control Rod Housings Item Number(s):

B14.10, Welds in CRD Housing Unit / Inspection Interval River Bend Station (RBS), Second (2nd) 10-year interval Applicability:

December 1, 1997 through May 31, 2008 I. Applicable Code Requirement(s)

ASME Code, Section Xl, 1992 Edition, 1993 Addenda, Table IWB-2500-1, Examination Category B-O, Pressure Retaining Welds in Control Rod Housings, Item B14.10 requires volumetric or surface examination of 10% of peripheral CRD housing welds.

I1. Impracticality of Compliance The as-installed configuration of the 36 peripheral CRD housings makes performance of the eight required examinations impractical for the following reasons. The housings are laterally proximate to the reactor vessel support pedestal, which limits access to the upper and lower welds on the outer circumference of the housings. Next, the subject welds are below the lower reactor insulation support structure where the housings pass through a series of closely-spaced CRD housing support beams and associated hanger rods, which further limit access to the welds in the upper portion of the housings. Access to both the upper and lower welds from below is further limited by a series of CRD housing support bars, grid plates and grid clamps. Access to the lower welds from the housing ID requires removal of the CRD mechanisms and sleeves. See Diagrams 1 - 5 on pages 5-9 of this relief request.

Ill. Proposed Alternatives and Basis of Use Relief is requested from performing the volumetric or surface examinations on 10% of the peripheral CRD housing welds. The subject welds will continue to receive VT-2 examination with the Reactor Coolant Pressure Boundary (RCPB) system leakage test conducted prior to startup from each refueling outage. Under-vessel Drywell leakage is also monitored during each operational cycle.

IV. Duration of Requested Relief Relief is requested for the second ISI Interval from December 1, 1997 through May 31, 2008.

V. Precedents Relief from the subject examinations was previously approved by the NRC Staff for the first ISI Interval as documented in NRC SSER 3, Appendix L following the preservice examination.

to RBG-47166 Page 2 of 8 RIVER BEND STATION - UNIT I SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-01 6 TABLE 1 - AFFECTED COMPONENTS COMPONENT NO CATEGORY ITEM NUMBER DESCRIPTION B13-D008-04/17-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-04/17-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-04/21-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-04/21-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-04/25-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-04/25-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-04/29-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-04/29-WELD-2 B-a B14.10 Welds in CRD Housing 813-D008-04/33-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-04/33-WELD-2 B-0 814.10 Welds in CRD Housing B13-D008-04/41-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-04/41-WELD-2 B-0 814.10 Welds in CRD Housing 81 3-D008-08/13-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-08/13-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-08/45-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-08/45-WELD-2 B-0 814.10 Welds in CRD Housing 813-D008-12/09-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-12/09-WELD-2 B-0 814.10 Welds in CRD Housing B13-D008-12/49-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-12/49-WELD-2 B-0 814.10 Welds in CRD Housing B13,D008-16/05-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-16/05-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-16/53-WELD-1 B-0 8314.10 Welds in CRD Housing 813-D008-16/53-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-20/05-WELD-1 B-0 814.10 Welds in CRD Housing B13-D008-20/05-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-20/53-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-20/53-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-24/05-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-24/05-WELD-2 B-0 814.10 Welds in CRD Housing B13-D008-24/53-WELD-1 B-0 B14.10 Welds in CRD Housing 81 3-D008-24/53-WELD-2 B-0 8314.10 Welds in CRD Housing B13-D008-28/05-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-28/05-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-28/53-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-28/53-WELD-2 B-0 B14.10 Welds in CRD Housing 813-D008-32/05-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-32/05-WELD-2 B-0 B14.10 Welds in CRD Housing to RBG-47166 Page 3 of 8 RIVER BEND STATION - UNIT 1 SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-016 TABLE I - AFFECTED COMPONENTS B13-D008-32/53-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-32/53-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-36/05-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-36/05-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-36/53-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-36/53-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-40/05-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-40/05-WELD-2 B-0 B14.10 Welds in CRD Housing B13-D008-40/53-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-40/53-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-44/09-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-44/09-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-44/49-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-44/49-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-48/13-WELD-1 B-0 B14.10 Welds in CRD Housing B13-D008-48/13-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-48/45-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-48/45-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/17-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-52/17-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/21-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-52/21 -WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/25-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-52/25-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/29-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-52/29-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/33-WELD-1 B-a B14.10 Welds in CRD Housing.

B13-D008-52/33-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/37-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-52/37-WELD-2 B-a B14.10 Welds in CRD Housing B13-D008-52/41-WELD-1 B-a B14.10 Welds in CRD Housing B13-D008-52/41-WELD-2 B-a B14.10 Welds in CRD Housing to RBG-47166 Page 4 of 8 DIAGRAM 1 General Configuration FUEL ASSELIBUES CONTROL BLADE CORE PLATE PUMP I RECIRCULATION WATER INLET RECIRMULATION WATER OUTLET VESSEL SUPPORT SKIRT SHIELD WALL CONTROL ROD DRIVES COIROL ROD DRIVE HYDRAUC UNES IN-OORE FLUX MONITOR Reactor Vessel Support Pedestal ASSEMBLY to RBG-47166 Page 5 of 8 DIAGRAM Elevation Vi i

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CRD Housing Support Beams to RBG-47166 Page 6 of 8 DIAGRAM 3 CRD Housing Support Structures NOTE:

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INCORE & CRD.-HOUSING COORDINATES to RBG-47166 Page 8 of 8 DIAGRAM 5 CRD Housing Weld Map

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ATTACHMENT 2 TO RBG-47166 RIVER BEND STATION - UNIT I SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-01 7 to RBG-47166 Page 1 of 8 RIVER BEND STATION - UNIT 1 SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-01 7 Component(s) Affected See Table 1 below Code Class:

ASME Code Class 2

References:

ASME Section Xl 1992 Edition, 1993 Addenda, Table IWC-2500-1 Inspection Program B Examination Category:

C-G, Pressure Retaining Welds in Pumps and Valves Item Number(s):

C6.10, Pump Casing Welds Unit / Inspection River Bend Station (RBS), Second (2nd)10-year interval Interval Applicability:

December 1, 1997 through May 31, 2008 I. Applicable Code Requirement(s)

ASME Code, Section Xl, 1992 Edition, 1993 Addenda, Table IWC-2500-1, Examination Category C-G, Pressure Retaining Welds in Pumps and Valves - Inspection Program B.

Item C6.10 requires surface examination of 100% of welds in all components in each piping run examined under Examination Category C-F each inspection interval. For extent of examination, Note 1 applies, where in the case of multiple pumps and valves of similar design, size, function and service in a system, the examination of only one pump and one valve among each group of multiple pumps and valves is required.

II. Impracticality of Compliance Insufficient access exists to perform the required examination of the subject welds due to the close proximity of twenty-four adjacent nuts/washers that fasten each upper pump casing to the lower (embedded) casing.

Ill. Proposed Alternatives and Basis for Use Relief is requested from performing the surface examination of the DH-1 weld as depicted in Diagrams 1-6 for the pumps listed in Table 1 - Affected Components.

The required examinations will be performed if the subject pumps are disassembled for maintenance to the point were the subject welds are accessible. The subject welds will continue to receive VT-2 examinations with the associated system leakage tests. The remaining weld examinations for the subject pumps were either performed or prior relief was approved.

IV. Duration of Requested Relief Relief is requested for the second ISI Interval from December 1, 1997 through May 31, 2008.

V. Precedents Relief from the subject examinations was approved by the NRC Staff for the first ISI Interval as documented in NRC SER dated March 9, 2000, which included RR1-0003 revision 3 (TAC No. MA4546).

to RBG-47166 Page 2 of 8 RIVER BEND STATION - UNIT I SECOND 10 YEAR INTERVAL INSERVICE INSPECTION PROGRAM REQUEST FOR RELIEF RBS-ISI-017 TABLE 1 - AFFECTED COMPONENTS COMPONENT NO CATEGORY ITEM DESCRIPTION NUMBER E12-PCO02A-DH-01 C-G C6.10 Pump Casing Welds E21-PCO01-DH-01 C-G C6. 10 Pump Casing Welds E22-PCO01-DH-01 C-G C6. 10 Pump Casing Welds to RBG-47166 Page 3 of 8 DIAGRAM I Pump E12-PCO02A

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ITQ 5WELD MAP DISCHARGE HEAD & SUCTION BARREL to RBG-47166 Page 4 of 8 DIAGRAM 2 Pump E21-PCOOI LEG EN~D wLSEXEMPT fROM EANTO WELDO REQUIRING XMWTN PER AWE 6ECTION X1.

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I M 5 WELD MAP DISCHARGE HEAD & SUCTION BARREL to RBG-47166 Page 5 of 8 DIAGRAM 3 Pump E22-PCO01 LEGEN LIZI-LD EXEMPT fROMEXMNTO QIID-WELDS RQUIRIN6 EXAMINATION PER AW~E 6ECTION MI.

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jP.,,,P,,-,-,4-WELD MAP DISCHARGE HEAD & SUCTION BARREL to RBG-47166 Page 6 of 8 DIAGRAM 4 Pump Bolting Configuration (Typical)

DIAGRAM 4

Pump Bolting Configuration (Typical)

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BOLTING ARRANGEMENT to RBG-47166 Page 7 of 8 DIAGRAM 5 Pump Bolting Configuration (Typical)

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'R, a Z-f WSv!vM to RBG-47166 Page 8 of 8 DIAGRAM 6 Pump Bolting Configuration (Typical)

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