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| number = ML14084A383
| number = ML14084A383
| issue date = 03/14/2014
| issue date = 03/14/2014
| title = Millstone Power Station Unit 2, Response to Second Request for Additional Information for Alternative Request RR-04-16 for the Use of Encoded Phased Array Ultrasonic Examination Techniques (Paut) in Lieu of Radiography (TAC MF2520)
| title = Response to Second Request for Additional Information for Alternative Request RR-04-16 for the Use of Encoded Phased Array Ultrasonic Examination Techniques (Paut) in Lieu of Radiography
| author name = Sartain M D
| author name = Sartain M
| author affiliation = Dominion Nuclear Connecticut, Inc
| author affiliation = Dominion Nuclear Connecticut, Inc
| addressee name =  
| addressee name =  
Line 13: Line 13:
| document type = Letter
| document type = Letter
| page count = 10
| page count = 10
| project = TAC:MF2520, TAC:MF2520
| project = TAC:MF2520
| stage = RAI
| stage = Request
}}
}}


=Text=
=Text=
{{#Wiki_filter:Dominion Nuclear Connecticut, Inc.5000 Dominion Boulevard, Glen Allen, VA 23060Web Address: www.dom.comMarch 14, 2014U.S. Nuclear Regulatory CommissionAttention: Document Control DeskWashington, DC 20555DOMINION NUCLEAR CONNECTICUT. INC.ADominiontSerial No. 14-145NLOS/WDC RODocket No. 50-336License No. DPR-65MILLSTONE POWER STATION UNIT 2RESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION FORALTERNATIVE REQUEST RR-04-16 FOR THE USE OF ENCODED PHASEDARRAY ULTRASONIC EXAMINATION TECHNIQUES (PAUT) IN LIEU OFRADIOGRAPHY (TAC NO. MF2520)In a letter dated August 1, 2013, Dominion Nuclear Connecticut, Inc. (DNC) requestedrelief from the requirements of the American Society of Mechanical Engineers (ASME)Boiler and Pressure Vessel Code Section III for Millstone Power Station Unit 2(MPS2). Specifically, DNC requested approval to use encoded Phased ArrayUltrasonic Examination Techniques as an alternative to radiographic examination forASME Class 2 carbon steel circumferential pipe weld joints to satisfy nondestructiveexamination requirements. In a letter dated October 1, 2013, the Nuclear RegulatoryCommission (NRC) transmitted a request for additional information (RAI) to DNCrelated to the alternative request. In letters dated November 22, 2013 and February27, 2014, DNC responded to the RAI. On March 12, 2014, the NRC transmitted asecond RAI related to the alternative request.The attachment to this letter contains DNC's response to the RAI.If you have any questions regarding this submittal, please contact Wanda Craft at(804) 273-4687.Sincerely,Mark D. SartainVice President -Nuclear EngineeringAttachment:1. Response to Second Request for Additional Information for AlternativeRequest RR-04-16 Proposed Alternative to ASME Section IIICommitments made in this letter: NoneA-0c47 Serial No. 14-145Docket No. 50-336Page 2 of 2cc: U.S. Nuclear Regulatory CommissionRegion I2100 Renaissance BlvdSuite 100King of Prussia, PA 19406-2713James S. KimProject ManagerU.S. Nuclear Regulatory CommissionOne White Flint North, Mail Stop 08 C2A11555 Rockville PikeRockville, MD 20852-2738Mohan C. ThadaniProject ManagerU.S. Nuclear Regulatory CommissionOne White Flint North, Mail Stop 08 B 111555 Rockville PikeRockville, MD 20852-2738NRC Senior Resident InspectorMillstone Power Station Serial No. 14-145Docket No. 50-336ATTACHMENTRESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION FORALTERNATIVE REQUEST RR-04-16PROPOSED ALTERNATIVE TO ASME SECTION IIIMILLSTONE POWER STATION UNIT 2DOMINION NUCLEAR CONNECTICUT, INC.
{{#Wiki_filter:Dominion Nuclear Connecticut, Inc.
Serial No. 14-145Docket No. 50-336Attachment 1, Page 1 of 7BackqroundIn a letter dated August 1, 2013, Dominion Nuclear Connecticut, Inc. (DNC) requestedrelief from the requirements of the American Society of Mechanical Engineers (ASME)Boiler and Pressure Vessel Code Section III for Millstone Power Station Unit 2 (MPS2).Specifically, DNC requested approval to use encoded Phased Array UltrasonicExamination Techniques (PAUT) as an alternative to radiographic examination forASME Class 2 carbon steel circumferential pipe weld joints to satisfy nondestructiveexamination requirements. In a letter dated October 1, 2013, the Nuclear RegulatoryCommission (NRC) transmitted a request for additional information (RAI) to DNCrelated to the alternative request. In letters dated November 22, 2013 and February 27,2014, DNC responded to the RAI. On March 12, 2014, the NRC transmitted a secondRAI related to the alternative request. This attachment provides DNC's response to theRAI.Question 1Describe the radiographic testing procedure used to characterize the specimensdescribed in the letter dated February 27 in detail. Identify if the radiographic testingprocedure used single or double wall viewing and how many shots and angles weretaken per weld.DNC ResponseThe radiographic examinations were performed with the examination personnel havingno knowledge of the location or type of flaws implanted within the mockups. Theradiographic testing procedure used to characterize the mockups consisted of ASMESection V, Article 2 radiographic examination techniques, typical of examinationsperformed in the plant. The examinations were performed using an Iridium 192 sourcewith the direction of the central beam of radiation centered on the area of interest andperpendicular to the film, to the extent possible. Each weld consisted of four film views;0 to 90 degrees, 90 to 180 degrees, 180 to 270 degrees, and 270 to 0 degrees, withadequate overlap to provide complete coverage of the entire weld length. Single wallviewing was used to interpret the film.
5000 Dominion Boulevard, Glen Allen, VA 23060                    ADominiont Web Address: www.dom.com March 14, 2014 U.S. Nuclear Regulatory Commission                        Serial No. 14-145 Attention: Document Control Desk                          NLOS/WDC     RO Washington, DC 20555                                      Docket No. 50-336 License No. DPR-65 DOMINION NUCLEAR CONNECTICUT. INC.
Serial No. 14-145Docket No. 50-336Attachment 1, Page 2 of 7Question 2Did the radiographic testing procedure used to evaluate the specimens described in theletter dated February 27 meet the requirements of ASME Code Section V Article 2?DNC ResponseYes, the radiographic testing procedure used to evaluate the specimens described inthe letter dated February 27 meets the requirements of ASME Code Section V, Article2.Question 3Provide a table describing the implanted flaws used to qualify the ultrasonic inspectionprocedure. Include the flaw types and dimensions. The NRC staff understands thatreleasing this information may compromise the blind qualification testing. If thisinformation is proprietary include the necessary affidavit for the NRC staff to treat theinformation as proprietary.DNC ResponseTo maintain the integrity of the test qualification material, the information will be madeavailable for NRC review.Question 4Provide examples of successful ultrasonic detection of planar flaws in the 0.28 inchthick test blocks.DNC ResponseThe following Figures 1 through 5 provide examples of the ultrasonic data representingsuccessful detections and characterizations of typical fabrication flaws from theDominion procedure qualification data. These figures provide examples of lack offusion defects, lack of penetration defects, and cracks, which were implanted into the 6inch diameter, 0.28 inch thick welded mockups. These mockups represent the weldconfigurations and welding processes to be used for the replacement welds. The flawmap for each of these examples is included in the applicable figures. The planar flawsidentified in Figures 2, 3, and 4 were not detected with the radiographic examinationperformed.
MILLSTONE POWER STATION UNIT 2 RESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION FOR ALTERNATIVE REQUEST RR-04-16 FOR THE USE OF ENCODED PHASED ARRAY ULTRASONIC EXAMINATION TECHNIQUES (PAUT) IN LIEU OF RADIOGRAPHY (TAC NO. MF2520)
Serial No. 14-145Docket No. 50-336Attachment 1, Page 3 of 7Figure 1Weld 4 -Flaw 3, Incomplete PenetrationIt= 4r--..,, -i %v- , .Upstream Detection Using First Leg.~IIII=Down Stream Detection Using First Leg Serial No. 14-145Docket No. 50-336Attachment 1, Page 4 of 7Figure 2Weld 4 -Flaw 5, Crack*.."'PDown Stream (Near Side) Detection Using First Leg Serial No. 14-145Docket No. 50-336Attachment 1, Page 5 of 7Figure 3Weld 5 -Flaw 2, CrackI,,...Down Stream (Near Side) Detection Using First Leg Serial No. 14-145Docket No. 50-336Attachment 1, Page 6 of 7Figure 4Weld 5 -Flaw 4, Lack of FusionDon S-.4Down Stream (Near Side) Detection Using First and Second Leg Serial No. 14-145Docket No. 50-336Attachment 1, Page 7 of 7Figure 5Weld 5 -Flaw 5, CrackFLAW 5 r- 0, 105"Down Stream Detection Using Second Leg  
In a letter dated August 1, 2013, Dominion Nuclear Connecticut, Inc. (DNC) requested relief from the requirements of the American Society of Mechanical Engineers (ASME)
}}
Boiler and Pressure Vessel Code Section III for Millstone Power Station Unit 2 (MPS2).       Specifically, DNC requested approval to use encoded Phased Array Ultrasonic Examination Techniques as an alternative to radiographic examination for ASME Class 2 carbon steel circumferential pipe weld joints to satisfy nondestructive examination requirements. In a letter dated October 1, 2013, the Nuclear Regulatory Commission (NRC) transmitted a request for additional information (RAI) to DNC related to the alternative request. In letters dated November 22, 2013 and February 27, 2014, DNC responded to the RAI. On March 12, 2014, the NRC transmitted a second RAI related to the alternative request.
The attachment to this letter contains DNC's response to the RAI.
If you have any questions regarding this submittal, please contact Wanda Craft at (804) 273-4687.
Sincerely, Mark D. Sartain Vice President - Nuclear Engineering
 
==Attachment:==
: 1. Response to Second Request for Additional Information for Alternative Request RR-04-16 Proposed Alternative to ASME Section III Commitments made in this letter: None A-0c47
 
Serial No. 14-145 Docket No. 50-336 Page 2 of 2 cc: U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd Suite 100 King of Prussia, PA 19406-2713 James S. Kim Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 C2A 11555 Rockville Pike Rockville, MD 20852-2738 Mohan C. Thadani Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 B 1 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station
 
Serial No. 14-145 Docket No. 50-336 ATTACHMENT RESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION FOR ALTERNATIVE REQUEST RR-04-16 PROPOSED ALTERNATIVE TO ASME SECTION III MILLSTONE POWER STATION UNIT 2 DOMINION NUCLEAR CONNECTICUT, INC.
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 1 of 7 Backqround In a letter dated August 1, 2013, Dominion Nuclear Connecticut, Inc. (DNC) requested relief from the requirements of the American Society of Mechanical Engineers (ASME)
Boiler and Pressure Vessel Code Section III for Millstone Power Station Unit 2 (MPS2).
Specifically, DNC requested approval to use encoded Phased Array Ultrasonic Examination Techniques (PAUT) as an alternative to radiographic examination for ASME Class 2 carbon steel circumferential pipe weld joints to satisfy nondestructive examination requirements. In a letter dated October 1, 2013, the Nuclear Regulatory Commission (NRC) transmitted a request for additional information (RAI) to DNC related to the alternative request. In letters dated November 22, 2013 and February 27, 2014, DNC responded to the RAI. On March 12, 2014, the NRC transmitted a second RAI related to the alternative request. This attachment provides DNC's response to the RAI.
Question 1 Describe the radiographic testing procedure used to characterize the specimens described in the letter dated February 27 in detail. Identify if the radiographictesting procedure used single or double wall viewing and how many shots and angles were taken per weld.
DNC Response The radiographic examinations were performed with the examination personnel having no knowledge of the location or type of flaws implanted within the mockups. The radiographic testing procedure used to characterize the mockups consisted of ASME Section V, Article 2 radiographic examination techniques, typical of examinations performed in the plant. The examinations were performed using an Iridium 192 source with the direction of the central beam of radiation centered on the area of interest and perpendicular to the film, to the extent possible. Each weld consisted of four film views; 0 to 90 degrees, 90 to 180 degrees, 180 to 270 degrees, and 270 to 0 degrees, with adequate overlap to provide complete coverage of the entire weld length. Single wall viewing was used to interpret the film.
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 2 of 7 Question 2 Did the radiographictesting procedure used to evaluate the specimens described in the letter dated February27 meet the requirementsof ASME Code Section V Article 2?
DNC Response Yes, the radiographic testing procedure used to evaluate the specimens described in the letter dated February 27 meets the requirements of ASME Code Section V, Article 2.
Question 3 Provide a table describing the implanted flaws used to qualify the ultrasonicinspection procedure. Include the flaw types and dimensions. The NRC staff understands that releasing this information may compromise the blind qualification testing. If this information is proprietaryinclude the necessary affidavit for the NRC staff to treat the information as proprietary.
DNC Response To maintain the integrity of the test qualification material, the information will be made available for NRC review.
Question 4 Provide examples of successful ultrasonic detection of planar flaws in the 0.28 inch thick test blocks.
DNC Response The following Figures 1 through 5 provide examples of the ultrasonic data representing successful detections and characterizations of typical fabrication flaws from the Dominion procedure qualification data. These figures provide examples of lack of fusion defects, lack of penetration defects, and cracks, which were implanted into the 6 inch diameter, 0.28 inch thick welded mockups. These mockups represent the weld configurations and welding processes to be used for the replacement welds. The flaw map for each of these examples is included in the applicable figures. The planar flaws identified in Figures 2, 3, and 4 were not detected with the radiographic examination performed.
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 3 of 7 Figure 1 Weld 4 - Flaw 3, Incomplete Penetration It=     4r
  ,, -i ,
                                        %v-Upstream Detection Using First Leg
                                            .~IIII=
Down Stream Detection Using First Leg
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 4 of 7 Figure 2 Weld 4 - Flaw 5, Crack
* ..   "'P Down Stream (Near Side) Detection Using First Leg
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 5 of 7 Figure 3 Weld 5 - Flaw 2, Crack I,,...
Down Stream (Near Side) Detection Using First Leg
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 6 of 7 Figure 4 Weld 5 - Flaw 4, Lack of Fusion Don  S
-. 4 Down Stream (Near Side) Detection Using First and Second Leg
 
Serial No. 14-145 Docket No. 50-336 Attachment 1, Page 7 of 7 Figure 5 Weld 5 - Flaw 5, Crack FLAW 5             r- 0, 105" Down Stream Detection Using Second Leg}}

Latest revision as of 22:24, 5 February 2020

Response to Second Request for Additional Information for Alternative Request RR-04-16 for the Use of Encoded Phased Array Ultrasonic Examination Techniques (Paut) in Lieu of Radiography
ML14084A383
Person / Time
Site: Millstone Dominion icon.png
Issue date: 03/14/2014
From: Mark D. Sartain
Dominion Nuclear Connecticut
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
14-145, TAC MF2520
Download: ML14084A383 (10)
v • d • e


Text

Dominion Nuclear Connecticut, Inc.

5000 Dominion Boulevard, Glen Allen, VA 23060 ADominiont Web Address: www.dom.com March 14, 2014 U.S. Nuclear Regulatory Commission Serial No.14-145 Attention: Document Control Desk NLOS/WDC RO Washington, DC 20555 Docket No. 50-336 License No. DPR-65 DOMINION NUCLEAR CONNECTICUT. INC.

MILLSTONE POWER STATION UNIT 2 RESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION FOR ALTERNATIVE REQUEST RR-04-16 FOR THE USE OF ENCODED PHASED ARRAY ULTRASONIC EXAMINATION TECHNIQUES (PAUT) IN LIEU OF RADIOGRAPHY (TAC NO. MF2520)

In a letter dated August 1, 2013, Dominion Nuclear Connecticut, Inc. (DNC) requested relief from the requirements of the American Society of Mechanical Engineers (ASME)

Boiler and Pressure Vessel Code Section III for Millstone Power Station Unit 2 (MPS2). Specifically, DNC requested approval to use encoded Phased Array Ultrasonic Examination Techniques as an alternative to radiographic examination for ASME Class 2 carbon steel circumferential pipe weld joints to satisfy nondestructive examination requirements. In a letter dated October 1, 2013, the Nuclear Regulatory Commission (NRC) transmitted a request for additional information (RAI) to DNC related to the alternative request. In letters dated November 22, 2013 and February 27, 2014, DNC responded to the RAI. On March 12, 2014, the NRC transmitted a second RAI related to the alternative request.

The attachment to this letter contains DNC's response to the RAI.

If you have any questions regarding this submittal, please contact Wanda Craft at (804) 273-4687.

Sincerely, Mark D. Sartain Vice President - Nuclear Engineering

Attachment:

1. Response to Second Request for Additional Information for Alternative Request RR-04-16 Proposed Alternative to ASME Section III Commitments made in this letter: None A-0c47

Serial No.14-145 Docket No. 50-336 Page 2 of 2 cc: U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd Suite 100 King of Prussia, PA 19406-2713 James S. Kim Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 C2A 11555 Rockville Pike Rockville, MD 20852-2738 Mohan C. Thadani Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 B 1 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station

Serial No.14-145 Docket No. 50-336 ATTACHMENT RESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION FOR ALTERNATIVE REQUEST RR-04-16 PROPOSED ALTERNATIVE TO ASME SECTION III MILLSTONE POWER STATION UNIT 2 DOMINION NUCLEAR CONNECTICUT, INC.

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 1 of 7 Backqround In a letter dated August 1, 2013, Dominion Nuclear Connecticut, Inc. (DNC) requested relief from the requirements of the American Society of Mechanical Engineers (ASME)

Boiler and Pressure Vessel Code Section III for Millstone Power Station Unit 2 (MPS2).

Specifically, DNC requested approval to use encoded Phased Array Ultrasonic Examination Techniques (PAUT) as an alternative to radiographic examination for ASME Class 2 carbon steel circumferential pipe weld joints to satisfy nondestructive examination requirements. In a letter dated October 1, 2013, the Nuclear Regulatory Commission (NRC) transmitted a request for additional information (RAI) to DNC related to the alternative request. In letters dated November 22, 2013 and February 27, 2014, DNC responded to the RAI. On March 12, 2014, the NRC transmitted a second RAI related to the alternative request. This attachment provides DNC's response to the RAI.

Question 1 Describe the radiographic testing procedure used to characterize the specimens described in the letter dated February 27 in detail. Identify if the radiographictesting procedure used single or double wall viewing and how many shots and angles were taken per weld.

DNC Response The radiographic examinations were performed with the examination personnel having no knowledge of the location or type of flaws implanted within the mockups. The radiographic testing procedure used to characterize the mockups consisted of ASME Section V, Article 2 radiographic examination techniques, typical of examinations performed in the plant. The examinations were performed using an Iridium 192 source with the direction of the central beam of radiation centered on the area of interest and perpendicular to the film, to the extent possible. Each weld consisted of four film views; 0 to 90 degrees, 90 to 180 degrees, 180 to 270 degrees, and 270 to 0 degrees, with adequate overlap to provide complete coverage of the entire weld length. Single wall viewing was used to interpret the film.

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 2 of 7 Question 2 Did the radiographictesting procedure used to evaluate the specimens described in the letter dated February27 meet the requirementsof ASME Code Section V Article 2?

DNC Response Yes, the radiographic testing procedure used to evaluate the specimens described in the letter dated February 27 meets the requirements of ASME Code Section V, Article 2.

Question 3 Provide a table describing the implanted flaws used to qualify the ultrasonicinspection procedure. Include the flaw types and dimensions. The NRC staff understands that releasing this information may compromise the blind qualification testing. If this information is proprietaryinclude the necessary affidavit for the NRC staff to treat the information as proprietary.

DNC Response To maintain the integrity of the test qualification material, the information will be made available for NRC review.

Question 4 Provide examples of successful ultrasonic detection of planar flaws in the 0.28 inch thick test blocks.

DNC Response The following Figures 1 through 5 provide examples of the ultrasonic data representing successful detections and characterizations of typical fabrication flaws from the Dominion procedure qualification data. These figures provide examples of lack of fusion defects, lack of penetration defects, and cracks, which were implanted into the 6 inch diameter, 0.28 inch thick welded mockups. These mockups represent the weld configurations and welding processes to be used for the replacement welds. The flaw map for each of these examples is included in the applicable figures. The planar flaws identified in Figures 2, 3, and 4 were not detected with the radiographic examination performed.

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 3 of 7 Figure 1 Weld 4 - Flaw 3, Incomplete Penetration It= 4r

,, -i ,

%v-Upstream Detection Using First Leg

.~IIII=

Down Stream Detection Using First Leg

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 4 of 7 Figure 2 Weld 4 - Flaw 5, Crack

  • .. "'P Down Stream (Near Side) Detection Using First Leg

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 5 of 7 Figure 3 Weld 5 - Flaw 2, Crack I,,...

Down Stream (Near Side) Detection Using First Leg

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 6 of 7 Figure 4 Weld 5 - Flaw 4, Lack of Fusion Don S

-. 4 Down Stream (Near Side) Detection Using First and Second Leg

Serial No.14-145 Docket No. 50-336 Attachment 1, Page 7 of 7 Figure 5 Weld 5 - Flaw 5, Crack FLAW 5 r- 0, 105" Down Stream Detection Using Second Leg

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