ML22200A072
| ML22200A072 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/21/2022 |
| From: | Lopez B PG&E Corp |
| To: | Office of Nuclear Material Safety and Safeguards |
| Marlayna Doell, 301-415-3178 | |
| Shared Package | |
| ML22200A069 | List: |
| References | |
| Download: ML22200A072 (18) | |
Text
Diablo Canyon Power Plant Post-Shutdown Decommissioning Activities Report, Site-Specific Decommissioning Cost Estimate, and Irradiated Fuel Management Plan Presented by:
Brandy Lopez Decommissioning Licensing Supervisor July 21, 2022
Purpose / Goals Provide an overview of the Diablo Canyon Power Plant (DCPP) decommissioning plans described in the Post-Shutdown Decommissioning Activities Report (PSDAR),
Site-Specific Decommissioning Cost Estimate (SSDCE) and Irradiated Fuel Management Plan (IFMP).
Includes the initial submittals from 2019 and updates submitted to the NRC in 2021.
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DCPP Decommissioning Planning PG&E is currently working on decommissioning planning activities necessary to support direct transition to decommissioning upon permanent cessation of operations.
Plans continue to evolve as DCPP Units 1 and 2 progress closer to permanent cessation of operations.
This evolution will drive future updates in accordance with the NRC process.
PG&E continues to plan for decommissioning independent of current state policy discussions around continued operations.
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NRC Notification Requirements 10 CFR 50.82(a)(7) - PSDAR In taking actions permitted under §50.59 following submittal of the PSDAR, the licensee shall notify the NRC, in writing and send a copy to the affected State(s), before performing any decommissioning activity inconsistent with, or making any significant schedule change from, those actions and schedules described in the PSDAR, including changes that significantly increase the decommissioning cost.
10 CFR 50.54(bb) - IFMP The licensee shall notify the NRC of any significant changes in the proposed waste management program as described in the initial notification.
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Timeline 2018 11/2018 PG&E Notifies NRC of Permanent Cessation of Operations 12/2019 PG&E Submits PSDAR SSDCE IFMP 12/2018 PG&E Files 2018 NDCTP with CPUC 01/2020 PG&E Submits Settlement Agreement in 2018 NDCTP 03/2020 COVID-19 Pandemic Delays Public Meeting 09/2021 CPUC Approves 2018 NDCTP Settlement Agreement 10/2021 PG&E Files NRC Update Notification 2019 2020 2021 2022 07/2022 Public Meeting 12/2021 PG&E Files 2021 NDCTP 3Q/2022 PG&E Plans to Submit Updated PSDAR, SSDCE, and IFMP NDCTP: Nuclear Decommissioning Cost Triennial Proceeding CPUC: California Public Utilities Commission PSDAR: Post-Shutdown Decommissioning Activities Report SSDCE: Site-Specific Decommissioning Cost Estimate 5
2019 PSDAR and SSDCE - Planned Activities and Schedule Period Title Start Finish General Description
- 1) Pre-Shutdown Planning Dec.
2010 Oct.
2024 Consists of detailed planning, engineering, licensing, and permitting efforts, the bulk of which will take place 2017 - 2024.
- 2) Power Block Modifications Nov.
2024 Apr.
2027 Transitions the plant to a decommissioning configuration to support safe and efficient decommissioning.
- 3) Wet Storage May 2027 Jun.
2032 Designates the timeframe when spent nuclear fuel (SNF) is cooling in the spent fuel pools (SFPs) and/or is being transferred to the DC Independent Spent Fuel Storage Installation (ISFSI).
Concurrently, preparations are being made for major decontamination and dismantlement (D&D) in period 4.
- 4) Building Demolition Jul.
2032 Apr.
2035 Consists of D&D of radiological systems, structures, and components. Also includes removal of several ancillary (non-radiological) structures.
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2019 PSDAR and SSDCE - Planned Activities and Schedule (continued)
Period Title Start Finish General Description
- 5) Site Restoration May 2035 Dec.
2038 Includes demolition of non-radiological structures, conduct of final radiological surveys to support license termination, and restoration of non-ISFSI areas. Period ends with 10 CFR 50 license termination.
- 6) ISFSI Operations Jan.
2039 Aug.
2067 Designates the timeframe after 10 CFR 50 license termination where SNF and greater than Class C (GTCC) waste are stored only at the DC ISFSI and transferred to the Department of Energy (DOE) for storage at a permanent off-site repository.
This period also includes biological monitoring of the plant site restoration.
- 7) ISFSI Restoration Sep.
2067 Jan.
2076 Consists of removal of ISFSI structures, conduct of final radiological surveys for ISFSI license termination, restoration of affected areas, and biological monitoring of ISFSI restoration.
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Significant Changes Wet Cooling Time for Spent Nuclear Fuel (SNF)
Spent Fuel Pool Island not needed due to reduced time until fuel transferred to ISFSI Cold and Dark Modifications Reduced scope and delay of full implementation until final SNF offload Reduced number of Security Modifications 8
Significant Changes Repurposing Breakwater and Intake Proposed to serve as barging terminal for shipment of vast majority of decommissioning waste 9
Current Future Barge
Significant Changes Elimination of Offsite Power Supply Modifications Utilize existing 230kV lines and switchyard in lieu of bringing 12kV power into the site from an available offsite source, requiring new distribution lines.
Shipment of Waste via Pismo Beach Railyard (Contingency only)
Changed from principal shipping location to a contingency facility only because of the shift to barging.
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Significant Changes Revised Waste Transportation Strategy PG&E has determined that a plan which uses a blended approach of barges and trucks is best for the shipment of bulk waste from DCPP.
Barging is proposed for shipping the majority of bulk waste offsite during decommissioning.
This blended approach significantly reduces risk and environmental impacts while also reducing total overall costs for transporting waste during decommissioning.
Consistent with the recommendations included in Section IV.I of the Diablo Canyon Decommissioning Engagement Panel Strategic Vision Document.
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Reduction Drives Significant Changes Significant changes result in a cumulative reduction in decommissioning project duration, costs, and environmental impacts.
Reduction in environmental impacts such as the following:
Federally endangered or threatened species Emissions Total Waste Earlier termination of the 10 CFR Part 50 licenses Significant reduction in estimated costs to decommission DCPP 12
Significant Change to PSDAR Environmental Report PG&E has responsibly managed significant cultural resources within the Diablo Canyon lands for more than 40 years and is committed to continuing into decommissioning.
Ongoing consultation with Native American Tribes DCPP Land Stewardship Committee PG&E evaluated the impacts of decommissioning activities on Cultural, Historical, and Archaeological Resources.
Initially concluded that impacts within the DCPP operational area are small and bounded by the Decommissioning Generic Environmental Impact Statement (GEIS).
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Significant Change to PSDAR Environmental Report Based on the number of known cultural resources within the operational area and subsequent review of proposed decommissioning activities, PG&E identified the potential to have large impacts1 on cultural, historical and archaeological resources.
1 Significance level as defined in NRC Decommissioning GEIS 14
Significant Change to PSDAR Environmental Report PG&E will verify that decommissioning activities that impact cultural, historical, and archaeological resources are bounded by previously issued environmental impact statements or seek appropriate regulatory approval if needed prior to performing the activity.
A comprehensive Archaeological Resources Protection Plan (ARPP) will be developed as part of decommissioning.
ARPP will inventory the cultural resources and develop a monitoring and mitigation plan.
Additional mitigation measures will be required through permitting approvals and will involve Native American monitoring.
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Pre-Shutdown Planning PG&E made the decision many years in advance to retire DCPP Units 1 and 2 upon expiration of the current operating licenses.
Provides a unique opportunity to streamline the decommissioning effort, accelerate the decommissioning schedule, and reduce overall decommissioning costs by proceeding with substantial decommissioning planning activities.
NRC granted PG&E an exemption request to allow withdrawal of $187.8 million ($2017) from the Diablo Canyon Nuclear Decommissioning Trust to fund planning activities prior to permanent cessation of operations.
Plans will continue to evolve as DCPP Units 1 and 2 progress closer to permanent cessation of operations and we progress through the state permitting process.
This evolution will drive future updates in accordance with the NRC process. 16
Future Updates PG&E plans to provide the NRC an updated PSDAR, SSDCE, and IFMP in 3Q22.
Update will reflect plans as submitted to the CPUC in the 2021 NDCTP.
In 2022, PG&E executed a contract with Orano TN Americas for spent nuclear fuel and Greater-Than-Class-C waste dry cask storage systems. All cost and schedule updates associated with implementation of the new system have not been finalized. PG&E will provide a future update to reflect implementation of the new systems at DCPP.
PG&E will continue to provide the NRC notification of significant changes as required by 10 CFR 50.82(a)(7) and 10 CFR 50.54(bb).
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Thank You 18