ML20140B918
| ML20140B918 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 03/27/1997 |
| From: | Addy R CMS ENERGY CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9704010510 | |
| Download: ML20140B918 (19) | |
Text
{{#Wiki_filter:.. . - . . _ A CMS Energy Cornpany Big Rock PointNuckarPlant Kenneth R 9eners 10269(6-31 Norm Plant GeneralManager Charleoc, MI49720 March 27, 1997 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT - RESPONSE TO NRC REQUEST FOR CLARIFICATION - THIRD 10-YEAR INTERVAL INSERVIuE INSPECTION PROGRAN PLAN; REQUESTS FOR RELIEF. On March 11, 1997, the Big Rock Point staff and members of the Nuclear l Regulatory Commission staff, and one of its contractors, participated in a conference call with regard to the Big Rock Point Third 10-Year Interval Inservice Inspection Program Plan. The Big Rock Point staff agreed to submit l additional information to allow the NRC to complete their review of the program plan. Please find this information attached.
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gr \, Robert J Addy Plant Manager
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r CC: Administrator, Region III, USNRC g NRC Resident Inspector - Big Rock Point r I OLi ' i ATTACHMENT 9704010510 970327 5 i PDR ADOCK 0500 appuppppppy
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- CONSUNERS ENERGY CONPANY BIG ROCK POINT PLANT DOCKET 50-155 l
! RESPONSE TO NRC REQUEST FOR CLARIFICATION - THIRD 10-YEAR INTERVAL INSERVICE INSPECTION PROGRAN PLAN; REQUESTS FOR RELIEF. )
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' RESPONSE TO REQUEST FOR CLARIFICATION THIRD 10-YEAR INTERVAL INSERVICE INSPECTION PROGRAM PLAN l'- REQUESTS FOR RELIEF
- Reference (s)i
- 1. i Docket 50-155 - License DPR Big Rock Point Plant - Additional Relief Requests required
- for the Third Inspection Interval, dated July 18, 1996.
} 2. Docket 50-155 - License DPR Big Rock Point Plant - 60 Day Reply.to a request for , i additional information regarding the Big Rock Point Plant Third 10-Year Interval Inservice - l Inspection Program Plan Associated Requests for Relief, dated February 19,107. l
- 3. March 11,1997 telephone conference with Big Rock Point, NRC and INEL, requesting j
clarification relating to ultrasonic examination percentage of required volume coverage for ! j Relief Request (s) RR-16, RR AIS, RR-A19, RR-A20, RR-A21 and RR-A22. s i The following information is in response to the March 11,1997 telephone conference, request for j clarification, to allow the NRC to complete their review of the ISI Program Plan. In addition, to
- expedite the review process, a copy of this request for clarification is being sent to your contractor i
i: , INEL Research Center,2151 North Boulevard, P.O. Box 1625, Idaho Falls, Idaho 83415-2209, Attn: ; j Michael T. Anderson,
- fi
- The percent of the required volume (s) it' ntified are based on information taken from previous examination data. Big Rock Point and ransumers Energy Company ultrasonic level III, believe that !
- the documented percent of volume (s) f the 45 degree scans that are performed from the shell/ head ,
- side towards the flange or nozzles for nese requests for relief are conservative, and in most cases i
, actual examination coverage would probably be higher. l i j Big Rock Point also believes that it is not necessary to reedculate the percent of required volume t l coverage from the shell/ head side, even though the 45 degree scans may increase by several l percentage points. This is based on the personnel labor and radiation exposure required for i scaffolding installation / removal, insulation removal / replacement and retaking actual measurements on ' the component (s), when the percentage of the required volume examined would not substantially , increase and relief from code requirements would still be necessary. l la V r s
Request For Relief: RR-16 Comoonent Identification Code Class 1 Code Reference IWB-2500 Table IWB-2500-1 Examination Category B-A Item Number Bl.40 Component Description Reactor Pressure Vessel - Closure Head - Head to Flange Weld Weld Number: 806 2 Code ReauiremeD1 Table IWB-2500-1, Category B-A, Item Bl.40 requires a volumetric and surface examination of 100% of the weld length. Basis For Relief Due to component design configuration (reference previously supplied Drawing E-201-806-4) relating to the weld and flange proximity, the ultrasonic examination which is performed is limited in that the l code required volume cannot be achieved in all scanning paths. The percent of required volume l identified are based off of examination data. The axial angle beam scan from the head side with the beam direction towards the flange will allow examination of approximately 45% of the required volume for both the 45 and 60 degree search units. The head flange is in close proximity to the weld (806-2), so the scan lengths are limited in the axial angle beam scan from the flange towards the head. The required volumetric examination is limited to approximately 15% for the 45 degree search unit and 5% for the 60 degree search unit. , The total examination volume for the axial angle beam scans with two direction coverage will be 5%. l This is based on the use of a 60 degree search unit which is the most limiting angle. [ The 0 degree ultrasonic examination of the weld required volume is limited to approximately 45% l coverage. The limitation for this scan is a result of the design configuration where there is not a i constant parallel back surface (loss of backwall signal). The transverse scans (clockwise and counterclockwise) are not limited based on using Code Case N-460. These scans are performed by oscillating the search unit approximately i20 degrees.
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I l l Proposed Alternative Examinatinn
- The accessible weld volumes as identified above will be examined in lieu of the 100% volumetric examination requirements.
]
The required surface examination will be performed on the entire weld length as required by Section ! XI. i ! i
- Pre Startup Hydrostatic test.
Anorooriate Regulations l l This Request for Relief is being submitted in accordance with 10 CFR 50.55a(g)(5)(iii). Providing j access to obtain the required examination would necessitate a redesign of the closure head. Even j after a redesign, complete compliance with the requirements of Section XI probably could not be l achieved. l ( e 1
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i Request For Relief: RR-A18 Component identification i Code Class 1 Code Reference IWB-2500 Table IWB-2500-1 Examination Category B-D l Item Number B3.90 Component Description Reactor Pressure Vessel - Closure Head - Nozzle to Head Welds Weld Number (s): 807-2A,807-2B,807-3, l 807-1 A and 807-1B ' I Code Reauirement Table IWB-2500-1, Category B-D, item B3.90 requires a volumetric examination of all nozzle to vessel welds each inspection interval. Basis For Relief Due to the configuration of the nozzles and adjacent nozzles (reference previously supplied drawing l E-201-806-4 and E-201-807-4) relating to these limitations, the ultrasonic examination which is performed is limited in that the code required volume cannot be achieved in all scanning paths. The percent of required volume identified is based off of examination data. The axial angle beam scan with the search unit going towards the nozzles will allow examination of approximately 45% of the required volume for both the 45 and 60 degree search units. The axial angle beam scan with the search unit going from the nozzle towards the head will allow examination of approximately 15% for the 45 degree search unit and 8% for the 60 degree search unit. The total examination volume for the axial angle beam scans with two direction coverage will be 8%. This is based on the use of a 60 degree search unit which is the most limiting angle. The 0 degree ultrasonic examination of the weld required volume is limited to approximately 45% coverage. This limitation is a result of the design configuration where there is not a constant parallel back surface (loss of backwall signal). The transverse scans (clockwise and counterclockwise) are not limited based on using Code Case N-460. These scans are performed by oscillating the search unit approximately i20 degrees.
, . . . . - . - - - ~ . _ . - . _ - . - . . . . - ~ _ - . . . - - - . . ..
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- . . .. 1 Prooosed Alternative Examination
, The accessible weld volumes as identified above will be examined in lieu of the 100% volumetric i examination requirements. 1 4 Pre Startup Hydrostatic test. j Acorooriate Regulations 1
- This Request for Relief is being submitted in accordance with 10 CFR 50.55a(g)(5)(iii). Providing I access to obtain the required examination would necessitate a redesign of the closure head. Even after a redesign, complete compliance with the requirements of Section XI probably could not be achieved.
4 l
i i l Request For Relief: RR-A20 Component Identification Code Class 1 Code Reference IWB-2500 > Table IWB-2500-1 Examination Category B-D l Item Number B3.150 Component Description Emergency Condenser - Nozzle to Shell Welds : Weld Number (s): 103N,103S,104N and 104S I l Code Reauirement Table IWB-2500-1, Category B-D, item B3.150 requires a volumetric examination of all nozzle to vessel welds each inspection interval. Basis For Relief l l Due to the configuration of the nozzles, lifting lugs and insulation lugs (reference previously supplied ] drawing 132-533C) relating to these limitations, the ultrasonic examination which is performed is ' limited in that the code required volume cannot be achieved in all scanning paths. The percent of required volume identified is based off of examination data. The axial angle beam scan with the search unit going towards the nozzles will allow examination of approximately 45 percent of the required volume for both the 45 and 60 degree search units. The axial angle beam scan with the search units going from the nozzle towards the shell will allow examination of approximately 15 percent for the 45 degree search unit and 5 to 10 percent for the 60 degree search unit. The total examination volume for the axial angle beam scans with two direction coverage will be 5 percent. This is based on the use of a 60 degree search unit which is the most limiting angle. The 0 degree ultrasonic examination of the weld required volume is limited to approximately 45 percent coverage. This limitation is a result of component design configuration where there is not a constant parallel back surface (loss of backwall signal). The transverse scans (clockwise and counterclockwise) are not limited based on using Code Case N-460. These scans are performed by oscillating the search unit approximately i20 degrees.
' Prooosed Alternative Examination The accessible weld volumes as identified above will be examined in lieu of the 100% volumetric examination requirements.
j Pre Startup Hydrostatic test. Anoropriate Regulations 4 This Request for Relief is being submitted in accordance with 10 CFR 50.55a(g)(5)(iii). Providing access to obtain the required examination would require design modifications or replacement of the l component. Even after these changes, complete compliance with the requirements of Section XI probably could not be achieved.
Request For Relief: RR-A21
- Component Identification Code Class 1 Code Reference IWB-2500 Table IWB-2500-1 Examination Category B-D ltem Number B3.150 Component Description Clean-up Demineralizer Tank - Nozzle to Shell Welds Weld Number (s): 212,213,214 and 215 Code Reauirement Table IWB-2500-1, Category B-D, Item B3.150 requires a volumetric examination of all nozzle welds each inspection interval.
Basis For Relief Due to the configuration of the nozzles (reference previously supplied drawings Y30-4P58-1 and Y30-4858-3) relating to these limitations, the ultrasonic examination which is performed is limited in that the code required volume cannot be achieved in all scanning paths. The percentage of required j volume identified is based off of examination data. The axial angle beam scan with the search unit going towards the nozzle will allow examination of approximately 64 percent of the required volume for the 45 degree search unit and 52 percent for the 60 degree search unit. The axial angle beam scan with the search unit going from the nozzle towards the shell will allow examination of approximately 50 percent of the required volume for the 45 degree search unit and 35 to 40 percent for the 60 degree search unit. The total examination volume for the axial angle beam scans with two direction coverage will be 35 percent. This is based on the use of the 60 degree search unit which is the most limiting angle. The 0 degree ultrasonic examination of the weld required volume is limited to approximately 80
. percent coverage. This limitition is a result of the component design where there is not a constant i parallel back surface (loss of backwall signal).
The transverse scans (clockwise and counterclockwise) are not limited based on using Code Case N-460. These scans are performed by oscillating the search unit approximately i20 degrees.
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1
- ' Proposed Alternative Examination
] The accessible weld volumes as identified above will be examined in lieu of the 100 percent
- volumetric examination requirements.
Pre Startup Hydrostatic test. Aooropriate Regulations This Request for Relief is being submitted in accordance with 10 CFR 50.55a(g)(3)(iii). Providing access to obtain the required examination would require design modifications or componu2t replacement. Even after these changes, complete compliance with the requirements of Section XI probably could not be achieved. l l i
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i Request For Relief: RR-A22 l Comnonent identification
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Code Class 1' Code Reference IWB-2500 l Table IWB-2500-1 Examination Category B-D Item Number B3.150 Component Description Cleanup Regenerative Heat Exchanger - Nonle to Shell Welds Weld Number (s): A-7, B-8, C-8 and D-7
' Code Reauirernent ,
Table IWB-2500-1, Category B-D, Item B3.150 requires a volumetric examination of all nonle welds each inspection interval. Basis For Relief i Due to support lugs and noule configuration (reference previously supplied drawing DM-86366)
. relating to these limitations, the ultrasonic examination which is performed is limited in that the code l required volume cannot be achieved in all scanning paths. The percentage of required volume -
identified is based off of examination data. , The axial angle beam scan with the search unit going towards the nonle will allow examination of approximately 92 percent of the required volume for both the 45 and 60 degree search units. ! The axial angle beam scan with the search unit going from the nonle towards the shell will allow examination of approximately 50 percent of the required volume for the 45 degree search unit and 35 percent with the 60 degree search unit. The total examination volume for the axial angle beam scans with two direction coverage will be 35 percent. This is based on the use of the 60 degree search unit which is the most limiting angle. The 0 degree ultrasonic examination of the weld required volume is limited to approximately 70 percent coverage. This limitation is a result of the component design where there is not a constant parallel back surface (loss of backwall signal). The transverse scans (clockwise and counterclockwise) are not limited. These scans are performed by oscillating the search unit approximately i20 degrees. 1
- Proposed Alternative Examination The accessible weld volumes as identified above will be examined in lieu of the 100 percent volumetric examination requirements.
Pre Startup Hydrostatic test. Anoropriate Regulations This Request for Relief is being submitted in accordance with 10 CFR 50.55a(g)(5)(iii). Providing access to obtain the required examination would require component replacement or design modifications. Even after these changes, complete compliance with the requirements of Section XI probabl3 could not be achieved.
j 0 Request For Relief: RR-A19 Component Identification Code Class 1 Code Reference IWB-2500 I Table IWB-2500-1 , Examination Cctegory B-D ' Item Number B3.150 Component Description Steam Drum Steam Outlet Nozzle to Shell Welds l Weld Number (s): D-1, D-2, D-3 and D-4 i Code Reauirement i Table IWB-2500-1, Category B-D, item B3.150 requires a volumetric examination of all nozzle to vessel welds each inspection interval. Basis For Rel!ef Due to nozzle configuration and insulation lugs (reference previously supplied drawing E-230-101-9 and drawing E-230-103-6 attached) relating to these limitations, the ultrasonic examination which is performed is limited in that the code required volume cannot be achieved in all scanning paths. The percent of required volume identified is based off of examination data. The axial angle beam scan with the search unit going towards the nozzles will allow examination of approximately 45 percent of the required volume for both the 45 and 60 degree search units. The axial angle beam scan with the search unit going from the nozzle towards the shell will allow examination of approximately 15 percent for the 45 degree search unit and 5 percent for the 60 degree search unit. The total examination volume for the axial angle beam scans with two direction coverage will be 5 percent. This is based on the use of a 60 degree search unit which is the most limiting angle. The 0 degree ultrasonic examination of the weld required volume is limited to approximately 45 percent coverage. This limitation is a result of the design configuration where there is not a constant parallel back surface (loss of backwall signal). The transverse scans (clockwise and counterclockwise) are not limited based on using Code Case N-460. These examinations are performed by oscillating the search unit approximately 20 degrees. i
. - - ...- -. - ~ . . _ ~ . - . - . . ~ - - - . - - - _ - - - - . _ . . - _ . ~ . . - ..
1* . i Proposed Alternative Examination ! } The accessible weld volumes as identified above will be examined in lieu of the 100% volumetric ;
- examination requirements.
. Pre Startup Hydrostatic test. j t i Acoropriate Regulations , This Request for Relief is being submitted in accordance with 10 CFR 50.55a(g)(5)(iii). Providing , access to obtain the required examination would require component replacement or as a minimum, l design modifications. Even after these changes, complete compliance with the requirements of { Section XI probably could not be achieved. ; i i l
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