ML17160A084: Difference between revisions
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* Agenda 2 | L ~~~~~~~~~~~~~ | ||
&~* Agenda 2 | |||
* HBPP Decommissioning Status and Schedule | * HBPP Decommissioning Status and Schedule | ||
* Gardian System | * Gardian System | ||
Line 22: | Line 24: | ||
* CSM Wall Description and Characterization Plans | * CSM Wall Description and Characterization Plans | ||
* Potential L TP Changes | * Potential L TP Changes | ||
* | * LTP Approval Schedule | ||
Decommissioning Status and 3 Schedule | |||
* Unit 2 excavation and remediation nearing completion | * Unit 2 excavation and remediation nearing completion | ||
* Hot shop above grade demolition complete | * Hot shop above grade demolition complete | ||
* SAS building above grade demolition complete | * SAS building above grade demolition complete | ||
* Currently removing RPV cut "windows" | * Currently removing RPV cut "windows" | ||
* Spent fuel pool liner removal progressing | * Spent fuel pool liner removal progressing I | ||
Decommissioning Status and Schedule (Cont'd) | |||
Decommissioning Status and 4 Schedule (Cont'd) | |||
* Gardian system installed for soil processing | * Gardian system installed for soil processing | ||
* Discharge canal isolated from the bay | * Discharge canal isolated from the bay | ||
* Ground water treatment and pre-treatment system operational | * Ground water treatment and pre-treatment system operational | ||
* Soil management facility complete and in use | * Soil management facility complete and in use | ||
* Final site permit and Remedial Action Plan nearly ready for submittal | * Final site permit and Remedial Action Plan nearly ready for submittal | ||
* July 2015 | &~ 2015 Schedule Milestones 5 | ||
* May 2015 | * July 2015 Discharge Canal Remediation Complete | ||
* January 2016 Complete Water Cutoff Wall | * May 2015 Pre-Trenching Complete | ||
* January 2016 Complete Water Cutoff Wall | |||
Soil Management and Pre-treatment 8 Facilities I Ji I 9 Groundwater Treatment Facility 10 | |||
* s Sheet Pile for Canal Isolation 11 * & Gardian System Installation 12 Unit 2 Remediation 13 * & Waste Shipment Gardian System TBD | 6 Hot Shop Demolition | ||
&~~ SAS Building Demolition 7 | |||
Soil Management and Pre-treatment 8 Facilities I Ji I | |||
9 Groundwater Treatment Facility | |||
10 | |||
*s Sheet Pile for Canal Isolation | |||
11 | |||
* & Gardian System Installation | |||
12 Unit 2 Remediation | |||
13 | |||
* & Waste Shipment | |||
14 Gardian System TBD | |||
* System previously used at Big Rock Point | * System previously used at Big Rock Point | ||
* Contains 4 Canberra In-Situ Object Counting System (ISOCS) characterized detectors. | * Contains 4 Canberra In-Situ Object Counting System (ISOCS) characterized detectors. | ||
* A complete Validation and Verification (V&V) of each detector's characterization file has been completed as part of pre-operational system testing. | * A complete Validation and Verification (V&V) of each detector's characterization file has been completed as part of pre-operational system testing. | ||
* The Big Rock Point Technical Basis Document (TBD) has been revised for Humboldt Bay Power Plant specifics. | * The Big Rock Point Technical Basis Document (TBD) has been revised for Humboldt Bay Power Plant specifics. | ||
* The TBD will be submitted to NRC for review. | * The TBD will be submitted to NRC for review. | ||
15 Caisson Removal Retaining Wall | |||
* Outer water cutoff wall with excavation to remove SFP and install sheet piling for lower caisson removal is the feasibility study provided to CPUC | * Outer water cutoff wall with excavation to remove SFP and install sheet piling for lower caisson removal is the feasibility study provided to CPUC | ||
* Contractor proposed a different alternative using CSM (Cutter Soil Mix) technology but award was bounded by feasibility approach | * Contractor proposed a different alternative using CSM (Cutter Soil Mix) technology but award was bounded by feasibility approach | ||
* PG&E is considering different configurations of CSM option | * PG&E is considering different configurations of CSM option | ||
* CSM alternative may be used in addition to water cutoff wall from the surface for caisson removal | * CSM alternative may be used in addition to water cutoff wall from the surface for caisson removal | ||
. &r CSM Cutter Head 18 19 . s CSM Installation | 16 CSM Installation Water/Cement Injected Water/Bentooite Injected | ||
. &r Water/Soil Excess Removal | ~ | ||
* Discharged Material 22 CSM Wall with Ring Steel x 2.8 S<: IL | Foons CSM Loosens ~ Wall and Sizes Soil Equ1>fnent Side View | ||
-----* Potential CSM Wall Example Diagram 110' WITH 3 METER THICK WALL | |||
17 | |||
* & Cutter Soil Mix (CSM) Machinery | |||
.&r CSM Cutter Head 18 | |||
19 | |||
.s CSM Installation | |||
20 | |||
.&r Water/Soil Excess Removal | |||
21 Completed Panel | |||
&~* Discharged Material 22 | |||
23 CSM Wall with Ring Steel x 2.8 S<:IL 1111 p | |||
El.. 6 El. 1 o* ( .) | |||
El.. 16 El. | |||
El. 4 q *- o El. 56 El. | |||
El.. 16 El. a | |||
-t io* c::H rr 0 1** I- | |||
----------~ - ---- | |||
&~* Potential CSM Wall Example Diagram 24 110' C~LL WITH 3 METER THICK WALL | |||
~ | |||
rei=ITTER OF REACTOR AND CAISSON | |||
25 Reasoning for Potential CSM Wall | |||
* Prevents un-shored excavations | * Prevents un-shored excavations | ||
* Installed completely from ground level | * Installed completely from ground level | ||
* Minimizes on-site excavation equipment | * Minimizes on-site excavation equipment | ||
* Reduces volume of material to be handled | * Reduces volume of material to be handled | ||
* Encompasses the spent fuel pool | * Encompasses the spent fuel pool | ||
* Challenges to CSM Wall Installation | |||
&~* Challenges to CSM Wall Installation 26 | |||
* Wall construction utilizes displaced soils as part of the construction material | * Wall construction utilizes displaced soils as part of the construction material | ||
* CSM wall will be left in place at license termination | * CSM wall will be left in place at license termination | ||
* Residual activity within the CSM wall will potentially affect future groundwater dose | * Residual activity within the CSM wall will potentially affect future groundwater dose | ||
27 CSM Wall Soil Sampling | |||
~- Soil impacted Geo probe by CSM wall sampling in soils around where CSM wall will be placed | |||
Calculating Future Groundwater 28 Dose | |||
* Core bore sampling could assess the activity inventory in the CSM wall to remain and characterize soil outside of the wall | * Core bore sampling could assess the activity inventory in the CSM wall to remain and characterize soil outside of the wall | ||
* A basement fill model could be used to determine the potential dose contribution to groundwater from the CSM wall | * A basement fill model could be used to determine the potential dose contribution to groundwater from the CSM wall | ||
* The dose contribution from the CSM wall would have to be included with any other dose pathways in demonstrating the area meets the License Termination Rule of 25 mrem/yr plus A LARA NRC Approvals Requirement | * The dose contribution from the CSM wall would have to be included with any other dose pathways in demonstrating the area meets the License Termination Rule of 25 mrem/yr plus A LARA I_ ~ | ||
: 1) If no activity found in soil, no approval required. | |||
: 2) If activity less than soil DCGL, treat wall as soil and no approval required. | 29 NRC Approvals Requirement | ||
: 3) If activity greater than soil DCGL, use a basement fill model to determine potential dose to groundwater pathway. For number 3, PG&E would submit a request to the NRC for approval of the basement fill model methodology. | : 1) If no activity found in soil, no approval required. | ||
Supporting technical information will be provided in a Technical Based Document (TBD) requiring NRC approval. | : 2) If activity less than soil DCGL, treat wall as soil and no approval required. | ||
: 3) If activity greater than soil DCGL, use a basement fill model to determine potential dose to groundwater pathway. | |||
For number 3, PG&E would submit a request to the NRC for approval of the basement fill model methodology. Supporting technical information will be provided in a Technical Based Document (TBD) requiring NRC approval. | |||
30 L TP Approval Schedule | |||
* Any Outstanding NRC Items Needing Resolution to Approve L TP Revision 1? | * Any Outstanding NRC Items Needing Resolution to Approve L TP Revision 1? | ||
* Projected Date for NRC Approval | * Projected Date for NRC Approval}} |
Latest revision as of 17:21, 4 February 2020
ML17160A084 | |
Person / Time | |
---|---|
Site: | Humboldt Bay |
Issue date: | 11/19/2014 |
From: | Pacific Gas & Electric Co |
To: | NRC Region 1 |
References | |
Download: ML17160A084 (31) | |
Text
I I
L ~~~~~~~~~~~~~
&~* Agenda 2
- HBPP Decommissioning Status and Schedule
- Gardian System
- Caisson Removal Retaining Wall Option
- CSM Wall Description and Characterization Plans
- Potential L TP Changes
- LTP Approval Schedule
Decommissioning Status and 3 Schedule
- Unit 2 excavation and remediation nearing completion
- Hot shop above grade demolition complete
- SAS building above grade demolition complete
- Currently removing RPV cut "windows"
- Spent fuel pool liner removal progressing I
Decommissioning Status and 4 Schedule (Cont'd)
- Gardian system installed for soil processing
- Discharge canal isolated from the bay
- Ground water treatment and pre-treatment system operational
- Soil management facility complete and in use
- Final site permit and Remedial Action Plan nearly ready for submittal
&~ 2015 Schedule Milestones 5
- July 2015 Discharge Canal Remediation Complete
- May 2015 Pre-Trenching Complete
- January 2016 Complete Water Cutoff Wall
6 Hot Shop Demolition
&~~ SAS Building Demolition 7
Soil Management and Pre-treatment 8 Facilities I Ji I
9 Groundwater Treatment Facility
10
- s Sheet Pile for Canal Isolation
11
- & Gardian System Installation
12 Unit 2 Remediation
13
- & Waste Shipment
14 Gardian System TBD
- System previously used at Big Rock Point
- Contains 4 Canberra In-Situ Object Counting System (ISOCS) characterized detectors.
- A complete Validation and Verification (V&V) of each detector's characterization file has been completed as part of pre-operational system testing.
- The Big Rock Point Technical Basis Document (TBD) has been revised for Humboldt Bay Power Plant specifics.
- The TBD will be submitted to NRC for review.
15 Caisson Removal Retaining Wall
- Outer water cutoff wall with excavation to remove SFP and install sheet piling for lower caisson removal is the feasibility study provided to CPUC
- Contractor proposed a different alternative using CSM (Cutter Soil Mix) technology but award was bounded by feasibility approach
- CSM alternative may be used in addition to water cutoff wall from the surface for caisson removal
16 CSM Installation Water/Cement Injected Water/Bentooite Injected
~
Foons CSM Loosens ~ Wall and Sizes Soil Equ1>fnent Side View
17
- & Cutter Soil Mix (CSM) Machinery
.&r CSM Cutter Head 18
19
.s CSM Installation
20
.&r Water/Soil Excess Removal
21 Completed Panel
&~* Discharged Material 22
23 CSM Wall with Ring Steel x 2.8 S<:IL 1111 p
El.. 6 El. 1 o* ( .)
El.. 16 El.
El. 4 q *- o El. 56 El.
El.. 16 El. a
-t io* c::H rr 0 1** I-
~ - ----
&~* Potential CSM Wall Example Diagram 24 110' C~LL WITH 3 METER THICK WALL
~
rei=ITTER OF REACTOR AND CAISSON
25 Reasoning for Potential CSM Wall
- Prevents un-shored excavations
- Installed completely from ground level
- Minimizes on-site excavation equipment
- Reduces volume of material to be handled
- Encompasses the spent fuel pool
&~* Challenges to CSM Wall Installation 26
- Wall construction utilizes displaced soils as part of the construction material
- CSM wall will be left in place at license termination
- Residual activity within the CSM wall will potentially affect future groundwater dose
27 CSM Wall Soil Sampling
~- Soil impacted Geo probe by CSM wall sampling in soils around where CSM wall will be placed
Calculating Future Groundwater 28 Dose
- Core bore sampling could assess the activity inventory in the CSM wall to remain and characterize soil outside of the wall
- A basement fill model could be used to determine the potential dose contribution to groundwater from the CSM wall
- The dose contribution from the CSM wall would have to be included with any other dose pathways in demonstrating the area meets the License Termination Rule of 25 mrem/yr plus A LARA I_ ~
29 NRC Approvals Requirement
- 1) If no activity found in soil, no approval required.
- 2) If activity less than soil DCGL, treat wall as soil and no approval required.
- 3) If activity greater than soil DCGL, use a basement fill model to determine potential dose to groundwater pathway.
For number 3, PG&E would submit a request to the NRC for approval of the basement fill model methodology. Supporting technical information will be provided in a Technical Based Document (TBD) requiring NRC approval.
30 L TP Approval Schedule
- Any Outstanding NRC Items Needing Resolution to Approve L TP Revision 1?
- Projected Date for NRC Approval