ML20112H542

Requests Relief from Exam Coverage Requirements of ASME Section XI ISI Program

ML20112H542
Person / Time
Site:	North Anna
Issue date:	06/13/1996
From:	Kansler M VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
96-274, NUDOCS 9606180277
Download: ML20112H542 (11)

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- 4 Vinom1A ELucriuC ann Powen COMI*ANY RicunoNo,VrHOINIA 20261 June 13, 1996 l

I Serial No.96-274 United States Nuclear Regulatory Commission NL&OS/EJW Docket No. 50-338 Attention: Document Control Desk Washington, D.C. 20555 License No. NPF-4 Gentlemen:

ylBGJNIA_E1ECTRIC AND POWEfLQOMPANY NORTH ANNAP_RWERSTATION UNIT _1 1RSIR_YKLE INSPECTION PROSRAM RELIEF d ten year REQUESTS North Anna Power Station Unit 1 is currently in theiththird ASME period of its sec interval. The component examination program is conducted has been mination in accordan f

Section XI 1983 Edition, Summer 1983 Adden coverage of class 1 and class 2 welds. the hi Six examinations performed during the 1996 ASME Refueling Section XI h

Outage did n required Code.

examination coverage of ASME Code Case i l i in the examination coverage requirements of ASME Sectio current second interval program for North Anna Unit 1. t Justification for the proposed exemptions fromhave the provedimpractical ex are provided in the attached relief requests. These any relief requests h by the North Anna Station Nuclear Safety and Operating Commi questions or require additional information, please contact us.

Very truly yours,

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cc: United States Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.

Suite 2900 Atlanta, GA 30323 Mr. R. D. McWhorter NRC Senior Resident inspector i North Anna Power Station l

ELELIEF RE_ QUEST NDE-21

1. IDENTIFICATION OF COMPONENTS Mark / Weld # Line# Drawing Class SW-32 6"-RC-21-1502-01 11715-WMKS-0109G-2 1 SW-41 12"-RC-24-1502-01 11715-WMKS-0109G-2 1 SW-43 6"-RC-20-1502-01 11715-WMKS-0109G-2 1 II. IMPRACTICABLE CODE REQUIREMENTS The 1983 edition summer 1983 addenda of ASME Section XI Table IWB-2500-1, examination category B-J, item number 89.31 does not allow any limitations to the required volumetric or surface examinations. Code Case N-460, Altemative Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%.

Ill. BASIS FOR RELIEF The components listed above have been examined to the extent practical as required by the Code. The Code required volumetric examination coverage was reduced due to nozzle configuration, weld joint geometry, and the material type from which the components are constructed. The scope of volumetric examination coverage completed for the above listed welds is listed in Table NDE-27-1. The required surface examinations had no limitations. Figure NDE-27-1 is provided detailing the limitations experienced. Alternative components could not be substituted for examination due to the mandatory selection requirements of the Code.

IV. ALTERNATE PROVISIONS lt is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.

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Tcble NDE-27-1 North Anna Unit 1 Examination Coverage Estimates .

11715-WMKS-0109G-2 -

Category B-J, item B9.31 9 UT Coverage % Surface Examination Mark / Weld # _2 3 1 3 Coverage % Reason for Partial Examination SW-32 80 0 28 28 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. Due to change in configuration around the nozzle, the percent of volume varied around the circumference. The weld was examined to the maximum extent practical using the RTD search unit from the loop pipe side. Approximately 80% of the lower 1/3 of the weid was covered in the 2 direction.

SW-41 83 0 28 28 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. Due to change in configuration around the nozzle, the percent of volume varied around the circumference. The weld was examined to the maximum extent practical using the RTD search unit from the loop pipe side. Approximately 83% of the lower 1/3 of the weld was covered in the 2 direction.

SW-43 76 0 28 28 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. Due to change in configuration around the nozzle, the percent of volume varied around the circumference. The weld was examined to the maximum extent practical using the RTD search unit from the loop pipe side. Approximately 76% of the lower 1/3 of the weld was covered in the 2 direction.

UT Scan Direction Definitionsf 2 - Axial scan,180 degrees from isometric flow direction (weld count).

5 - Axial scan, the same direction as the isometric flow (weld count).

7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.

8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.

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l BELIEF REQUEST NDE-23

1. IDENTIFICATION OF COMPONENTS Mark / Weld # Line# Drawing Class l 32 31"-RC-8-1502-Q1 11715-WMKS-01093-1 1 33 271/2"-RC 9-1502-Q1 11715-WMKS-0109G-1 1

11. IMPRACTICABLE CODE REQUIREMENTS The 1983 edition summer 1983 addenda of ASME Section XI Table IWB-2500-1, examination category B-J, item number B9.11 does not allow any limitations to the required volumetric or surface examinations. Code Case N-460, Altemative Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%.

Ill. BASIS FOR RELIEF The components listed above have been examined to the extent practical as

. required by the Code. The Code required volumetric examination coverage was reduced due to weld joint geometry, and the material type from which the components are constructed. The scope of volumetric examination coverage completed for the above listed welds is listed in Table NDE-28-1. The required surface examinations had no limitations. Figures NDE-28-1 and NDE-28-2 are provided detailing the limitations experienced. Altemative components could not 1 be substituted for examination due to the mandatory selection requirements of the i Code.

IV. ALTERNATE PROVISIONS It is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.

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Tcble NDE-28-1 North Anna Unit 1 Examination Coverage Estimates .

11715-WMKS-0109G-1 -

Category B-J, item B9.11 .

UT Coverage % Surface Examination Mark / Weld # _2 3 .Z 3 Coverage % Reason for Partial Examination 32 0 100 100 100 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting limit the use of an extended V-path examination. The weld was examined to the maximum extent practical using the 45' RTD search unit from the loop pipe side.

Approximately 100% of the lower 1/3 of the weld was covered in the 5 direction. ,

33 97 0 50 50 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. The weld was examined to t the maximum extent practical using 45' and 60' RTD search units from the loop pipe side. Approximately 97% of the lower 1/3 of the weld was covered in the 2 direction.

i UT Scan Direction Definitions 2 - Axial scan,180 degrees from isometric flow direction (weld count).

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8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.

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RE_ LIEF REQUEST NDE-29

1. IDENTIFICATION OF COMPONENT Mark / Weld # Line# Drawing Class SW-32 2"-RC-220-1502-01 11715 WMKS-0103BH 1 II. IMPRACTICABLE CODE REQUIREMENTS The 1983 edition summer 1983 addenda of ASME Section XI Table IWB 2500-1, examination category B-J, item number B9.21 does not allow any limitations to the required surface examination. Code Case N-460, Alternative Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%.

Ill. BASIS FOR RELIEF The component listed above has been examined to the extent practical as required by the Code Case. The Code required surface examination coverage was reduced due to the interference with a steel beam above the weld. This interference limited the examination of the weld to 6%" of the total 8", 81.25%. ,

Figure NDE-29-1 is provided detailing the limitations experienced. Altemative l components could not be substituted for examination due to the mandatory l selection requirements of the Inservice inspection Program for Class 1 piping I welds which requires all welds adjacent to integral attachments to be examined. I l

IV. ALTERNATE PROVISIONS It is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.

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