ML14188C478: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
 
(5 intermediate revisions by the same user not shown)
Line 2: Line 2:
| number = ML14188C478
| number = ML14188C478
| issue date = 07/07/2014
| issue date = 07/07/2014
| title = 2014/07/07 NRR E-mail Capture - Draft RAI for Catawba RR 14-CN-001
| title = NRR E-mail Capture - Draft RAI for Catawba RR 14-CN-001
| author name = Miller E
| author name = Miller E
| author affiliation = NRC/NRR/DORL
| author affiliation = NRC/NRR/DORL
| addressee name = Rudy L J
| addressee name = Rudy L
| addressee affiliation = Duke Energy Corp
| addressee affiliation = Duke Energy Corp
| docket = 05000413, 05000414
| docket = 05000413, 05000414
Line 15: Line 15:


=Text=
=Text=
{{#Wiki_filter:1NRR-PMDAPEm Resource From:Miller, Ed Sent:Monday, July 07, 2014 2:30 PM To:'lawrence.rudy@duke-energy.com'
{{#Wiki_filter:NRR-PMDAPEm Resource From:                     Miller, Ed Sent:                     Monday, July 07, 2014 2:30 PM To:                       'lawrence.rudy@duke-energy.com'


==Subject:==
==Subject:==
Draft RAI for Catawba RR 14-CN-001 Attachments:
Draft RAI for Catawba RR 14-CN-001 Attachments:             DRAFT Catawba 1-2 RR 14-CN-001 RAI.docx
DRAFT Catawba 1-2 RR 14-CN-001 RAI.docxLarry, The NRC staff's draft RAI for the subject relief request is atta ched to this e-mail. The draft RAI is not an official NRC staff request and is being provided to you to facilitate a subsequent conference call to determine: 1) If the questions clearly convey the NRC staff information needs; 2) Whether the regulatory basis for the questions is understood; 3) Whether the information is already available in existing, docketed, correspondence; and 4) To determine an appropriate response time-frame. After you've had a chance to review the draft information request, please contact me to schedule the conference call.  
: Larry, The NRC staffs draft RAI for the subject relief request is attached to this e-mail. The draft RAI is not an official NRC staff request and is being provided to you to facilitate a subsequent conference call to determine: 1) If the questions clearly convey the NRC staff information needs; 2) Whether the regulatory basis for the questions is understood; 3) Whether the information is already available in existing, docketed, correspondence; and 4) To determine an appropriate response time-frame. After youve had a chance to review the draft information request, please contact me to schedule the conference call.
Ed Miller (301) 415-2481 1


Ed Miller
Hearing Identifier:   NRR_PMDA Email Number:         1413 Mail Envelope Properties   (9C2386A0C0BC584684916F7A0482B6CAFD30068935)
 
(301) 415-2481
 
Hearing Identifier: NRR_PMDA Email Number: 1413   Mail Envelope Properties   (9C2386A0C0BC584684916F7A0482B6CAFD30068935)


==Subject:==
==Subject:==
Draft RAI for Catawba RR 14-CN-001 Sent Date:   7/7/2014 2:29:42 PM Received Date: 7/7/2014 2:29:00 PM From:   Miller, Ed Created By:   Ed.Miller@nrc.gov Recipients:     "'lawrence.rudy@duke-energy.com'" <lawrence.rudy@duke-energy.com> Tracking Status: None  
Draft RAI for Catawba RR 14-CN-001 Sent Date:           7/7/2014 2:29:42 PM Received Date:       7/7/2014 2:29:00 PM From:                 Miller, Ed Created By:           Ed.Miller@nrc.gov Recipients:
"'lawrence.rudy@duke-energy.com'" <lawrence.rudy@duke-energy.com>
Tracking Status: None Post Office:          HQCLSTR02.nrc.gov Files                          Size                  Date & Time MESSAGE                        672                    7/7/2014 2:29:00 PM DRAFT Catawba 1-2 RR 14-CN-001 RAI.docx                    35125 Options Priority:                      Standard Return Notification:          No Reply Requested:              No Sensitivity:                  Normal Expiration Date:
Recipients Received:


Post Office:  HQCLSTR02.nrc.gov Files    Size      Date & Time MESSAGE    672      7/7/2014 2:29:00 PM DRAFT Catawba 1-2 RR 14-CN-001 RAI.docx    35125 Options  Priority:    Standard  Return Notification:    No  Reply Requested:    No  Sensitivity:    Normal  Expiration Date:      Recipients Received:
DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING CATAWBA NUCLEAR STATION, UNITS 1 AND 2 RELIEF REQUEST SERIAL NUMBER 14-CN-001 LIMITED VOLUMETRIC EXAMINATION OF CLASS 1 WELDS DOCKET NOS. 50-413 AND 50-414 By letter dated February 20, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14052A387), Duke Energy Carolinas (Duke) submitted relief request 14-CN-001. Pursuant to 10 CFR 50.55a(g)(5)(iii), the request sought relief from the volumetric examination coverage requirements of the ASME Code, Section XI. In order for the NRC staff to complete its review of the relief request, the following additional information is requested.
ENCLOSURE DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING CATAWBA NUCLEAR STATION, UNITS 1 AND 2 RELIEF REQUEST SERIAL NUMBER 14-CN-001 LIMITED VOLUMETRIC EXAMINATION OF CLASS 1 WELDS DOCKET NOS. 50-413 AND 50-414


By letter dated February 20, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14052A387), Duke Energy Carolinas (Duke) submitted relief request 14-CN-001. Pursuant to 10 CFR 50.55a(g)(5)(iii), the request sought relief from the volumetric examination coverage requirements of the ASME Code, Section XI. In order for the  
===RAI 1===
The NRC compared the volumetric examination coverage amounts obtained during the third 10-year inservice inspection (ISI) interval for the nine welds identified in Table 1 in Duke Energys Relief Request 14-CN-001, and compared them to the coverage amounts obtained during the second 10-year ISI interval examinations. The NRC noted significant differences in the coverage amounts for the CNS Units 1 and 2 pressurizer surge nozzle to head welds, as summarized in Table 1.
: a. Explain the rationale for using the different scan angles to examine the pressurizer surge nozzle to head welds for both CNS units that led to the significantly different amount of coverage observed for these welds.
: b. Explain the capability of the 35 degree scan angle to adequately detect flaws in the pressurizer surge nozzle to head welds compared to the standard 45 degree and 60 degree scan angles.
: c. The figures in 14-CN-001 associated with this component indicate welds that have been ground flush. Clarify the surface condition of the welds and whether credit was taken for scans performed over the welds.
ENCLOSURE


NRC staff to complete its review of the relief request, the following additional information is requested. 
Table 1. Pressurizer Surge Nozzle to Head Weld Examination Coverage Amounts 2nd ISI Interval 3rd ISI Interval CNS                                            Coverage and Scan         Change Weld      Coverage and Scan Unit                                                  Angles          in Coverage Angles (1)
 
[Date of Exam, Source]
RAI 1  The NRC compared the volumetric examinati on coverage amounts obtained during the third 10-year inservice inspection (ISI) interval for the nine welds identified in Table 1 in Duke Energy's Relief Request 14-CN-001, and compared them to the coverage amounts obtained during the second 10-year ISI interval examinat ions. The NRC noted significant differences in the coverage amounts for the CNS Units 1 and 2 pressurizer surge nozzle to head welds, as summarized in Table 1.
1   1-PZR-W1             81.4 %                     77.2 %           + 4.2 %
: a. Explain the rationale for using the different scan angles to examine the pressurizer surge nozzle to head welds for both CNS units that led to the significantly different amount of coverage observed for these welds.
[2005, September 8, 2005 Relief Request (ML052590564)]
: b. Explain the capability of the 35 degree scan angle to adequately detect flaws in the pressurizer surge nozzle to head welds compared to the standard 45 degree and 60 degree scan angles.
Scan angles used:         Scan angles used:
: c. The figures in 14-CN-001 associated with this component indicate welds that have been ground flush. Clarify the surface condition of the welds and whether credit was taken for scans performed over the welds.
35&deg;, 45&deg;, 60&deg;                35&deg;, 45&deg; 2   2-PZR-W1             81.2 %                     42.8 %           + 38.4 %
Table 1. Pressurizer Surge Nozzle to Head Weld Examination Coverage Amounts CNS Unit Weld 3rd ISI Interval Coverage and Scan Angles (1) 2nd ISI Interval Coverage and Scan Angles [Date of Exam, Source]Change in Coverage 1 1-PZR-W1 81.4 %
[2001, December 20, 2001 Relief Request (ML0203300121)]
Scan angles used: 35&deg;, 45&deg;, 60&deg; 77.2 % [2005, September 8, 2005 Relief Request (ML052590564)]
Scan angles used:         Scan angles used:
Scan angles used: 35&deg;, 45&deg;  
35&deg;, 45&deg;, 60&deg;                60&deg;, 70&deg; Note:   (1) Source: Relief Request 14-CN-001 (ML14052A387).}}
+ 4.2 % 2 2-PZR-W1 81.2 %
Scan angles used: 35&deg;, 45&deg;, 60&deg; 42.8 % [2001, December 20, 2001 Relief Request (ML0203300121)]
Scan angles used: 60&deg;, 70&deg; + 38.4 %
Note: (1) Source: Relief Request 14-CN-001 (ML14052A387).}}

Latest revision as of 05:22, 5 December 2019

NRR E-mail Capture - Draft RAI for Catawba RR 14-CN-001
ML14188C478
Person / Time
Site: Catawba  Duke Energy icon.png
Issue date: 07/07/2014
From: Ed Miller
Division of Operating Reactor Licensing
To: Rudy L
Duke Energy Corp
References
Download: ML14188C478 (4)
v • d • e


Text

NRR-PMDAPEm Resource From: Miller, Ed Sent: Monday, July 07, 2014 2:30 PM To: 'lawrence.rudy@duke-energy.com'

Subject:

Draft RAI for Catawba RR 14-CN-001 Attachments: DRAFT Catawba 1-2 RR 14-CN-001 RAI.docx

Larry, The NRC staffs draft RAI for the subject relief request is attached to this e-mail. The draft RAI is not an official NRC staff request and is being provided to you to facilitate a subsequent conference call to determine: 1) If the questions clearly convey the NRC staff information needs; 2) Whether the regulatory basis for the questions is understood; 3) Whether the information is already available in existing, docketed, correspondence; and 4) To determine an appropriate response time-frame. After youve had a chance to review the draft information request, please contact me to schedule the conference call.

Ed Miller (301) 415-2481 1

Hearing Identifier: NRR_PMDA Email Number: 1413 Mail Envelope Properties (9C2386A0C0BC584684916F7A0482B6CAFD30068935)

Subject:

Draft RAI for Catawba RR 14-CN-001 Sent Date: 7/7/2014 2:29:42 PM Received Date: 7/7/2014 2:29:00 PM From: Miller, Ed Created By: Ed.Miller@nrc.gov Recipients:

"'lawrence.rudy@duke-energy.com'" <lawrence.rudy@duke-energy.com>

Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 672 7/7/2014 2:29:00 PM DRAFT Catawba 1-2 RR 14-CN-001 RAI.docx 35125 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING CATAWBA NUCLEAR STATION, UNITS 1 AND 2 RELIEF REQUEST SERIAL NUMBER 14-CN-001 LIMITED VOLUMETRIC EXAMINATION OF CLASS 1 WELDS DOCKET NOS. 50-413 AND 50-414 By letter dated February 20, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14052A387), Duke Energy Carolinas (Duke) submitted relief request 14-CN-001. Pursuant to 10 CFR 50.55a(g)(5)(iii), the request sought relief from the volumetric examination coverage requirements of the ASME Code,Section XI. In order for the NRC staff to complete its review of the relief request, the following additional information is requested.

RAI 1

The NRC compared the volumetric examination coverage amounts obtained during the third 10-year inservice inspection (ISI) interval for the nine welds identified in Table 1 in Duke Energys Relief Request 14-CN-001, and compared them to the coverage amounts obtained during the second 10-year ISI interval examinations. The NRC noted significant differences in the coverage amounts for the CNS Units 1 and 2 pressurizer surge nozzle to head welds, as summarized in Table 1.

a. Explain the rationale for using the different scan angles to examine the pressurizer surge nozzle to head welds for both CNS units that led to the significantly different amount of coverage observed for these welds.
b. Explain the capability of the 35 degree scan angle to adequately detect flaws in the pressurizer surge nozzle to head welds compared to the standard 45 degree and 60 degree scan angles.
c. The figures in 14-CN-001 associated with this component indicate welds that have been ground flush. Clarify the surface condition of the welds and whether credit was taken for scans performed over the welds.

ENCLOSURE

Table 1. Pressurizer Surge Nozzle to Head Weld Examination Coverage Amounts 2nd ISI Interval 3rd ISI Interval CNS Coverage and Scan Change Weld Coverage and Scan Unit Angles in Coverage Angles (1)

[Date of Exam, Source]

1 1-PZR-W1 81.4 % 77.2 % + 4.2 %

[2005, September 8, 2005 Relief Request (ML052590564)]

Scan angles used: Scan angles used:

35°, 45°, 60° 35°, 45° 2 2-PZR-W1 81.2 % 42.8 % + 38.4 %

[2001, December 20, 2001 Relief Request (ML0203300121)]

Scan angles used: Scan angles used:

35°, 45°, 60° 60°, 70° Note: (1) Source: Relief Request 14-CN-001 (ML14052A387).

Retrieved from "https://kanterella.com/w/index.php?title=ML14188C478&oldid=2234497"