ML14128A113
| ML14128A113 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 06/28/2012 |
| From: | Pacific Gas & Electric Co |
| To: | NRC/FSME |
| References | |
| Download: ML14128A113 (131) | |
Text
PacificGas and ElectricCompanyQ Humboldt Bay Power Plant Report Decommissioning Capstone Document Prepared for Pacific Gas and Electric Company June 28, 2012
HUMBOLDT BAY POWER PLANT PacificGas.and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 201Z
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HUMBOLDT BAY POWER PLANT SPacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT ElectricCompany" JUNE ZoJZ Contents Acronyms and Abbreviations ............................................................................................... iv 1 PG &E Values ................................................................................................................... 1 2 Purpose of this Document ....................................................................................... 2 2.1 S cope Understanding ...................................................................................... .. 2 2.2 PG&E and Bidder Interface .............................................................................. 2 2 .3 A u d ie nce ........................................................................................................ .. 3 3 Scope of Work for Transitioning Site to Civil Works Projects ................................ 4 3.1 Transitioning to Civil Works Projects ................................................................ 4 3.2 Major C ivil Work Projects ................................................................................ 5 3.3 Reactor Caisson Removal Option ..................................................................... 6 4 Contracting Strategies and Opportunities .............................................................. 7 5 Key Project Milestones ............................................................................................... 9 6 Project Challenges ................................................................................................... 10 6 .1 We ath e r ......................................................................................................... *..... 10 6.2 Site Coordination and Congestion ................................................................... 11 6.3 Installation of a S lurry Wall .............................................................................. 11 6.4 Below G rade O bstructions .............................................................................. 12 6.5 D eep E xcavations ........................................................................................ .. 12 6.6 Demolition Debris, Soil, Sediment, and Cross Contamination Control ............ 13 6.7 Intake and Discharge Canal Remediation ....................................................... 13 6.8 Final Status Survey Interface .......... :........................ 13 6.9 License Term ination ..................................................................................... .. 14 7 Partnering and Safety ............................................................................................... 16 HBPP Civil Works Project Sketches ................................................................................... 17 C a m p u s Ma p ................................................................................................................... 18 Key Milestone 1 Turbine Building Demolition and Ancillary Infrastructure Projects ........ 20 Key Milestone 2 Demolition and Excavation to Support Slurry Wall Installation ...... 22 Key Milestone 3 Slurry Wall Installation for Groundwater Control .............................. 24 Key Milestone 4 Refueling Building Demolition and Spent Fuel Pool Wall Removal ...... 26 Key Milestone 5 Caisson Removal-Option .............................................................. 28 Key Milestone 6 Start of Site Wide Restoration ......................................................... 30 Key Milestone 7 Final Site Restoration and Administrative Closeout ......................... 32 Conceptual Site Restoration Plan .............................................................................. 36 Attachm ents ............................................................................................................................ A -1 A ttachm ent A C ontract D etails ...................................................................................... A -2 Attachment B Project to Completion Schedule ......................................................... B-1 Attachment C HBPP Decommissioning Permitting Strategy ..................................... C-1 HBPP Decommissioning Permitting Strategy ...................................................................... C-2 PAGE I III
HUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Elecic Company Acronyms and Abbreviations ACCM Asbestos-Containing Construction Material APCD Air Pollution Control District ATS Active Treatment System Bidder Bidder or successful Bidder/Contractor as the case may be.
BM P Best Management Practice BWR Boiling Water Reactor CCC California Coastal Commission CDP Coastal Development Permit CEQA California Environmental Quality Act CQC Contractor Quality Control CRDM Control Rod Drive Mechanisms CS' Construction Specifications Institute CST Condensate Storage Tank D&D Decontamination and Demolition DCGL Derived Concentration Guideline Level Demin Room Demineralizer Pump Room DFW Definable Features of Work DTSC Department of Toxic Substance Control ETD easy-to-detect FSS Final Status Survey GElS Generic EnvironmentalImpact Statement on Decommissioning of Nuclear Facilities GWTS Groundwater Treatment System HBGS Humboldt Bay Generating Station HBPP Humboldt Bay Power Plant HLSV High Level Storage Vault HVAC Heating, Ventilation, Air Conditioning IMRAW Interim Measures Removal Action Workplan ISFSI Independent Spent Fuel Storage Installation IT Information Technology ITS important to safety PAGE I IV
HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT 2012 Electric Compay "n JUNE LLW Low Level Waste LRW Liquid RadWaste Building LTP License Termination Plan NCUAQMD North Coast Unified Air Quality Management District NEPA National Environmental Protection Act NESHAP National Emission Standards for Hazardous Air Pollutant NOV Notice of Violation NPDES National Pollutant Discharge Elimination System NRC Nuclear Regulatory Commission ORISE Oak Ridge Institute for Science and Education PAPR Powered Air Purifying Respirator PEG Propane Engine Generator PG&E Pacific Gas and Electric POND Plan-of-Next-Day RCP reinforced concrete pipes REDT Reactor Equipment Drain Tank REDT Reactor Equipment Drain Tank REU restricted end-use RFB Refuel Building RFP Reactor Feed Pump RFP Request for Proposal RPV Reactor Pressure Vessel SF square feet SFP Spent Fuel Pool SPAMS Stack Particulate Alpha Monitoring System SREU semi-restricted end-use SSC structures, systems, and components SWH Solid Waste Handling SWPPP Stormwater Pollution Prevention Plan SWRCB State Water Resources Control Board TBDT Turbine Building Drain Tank TSI Thermal System Insulation WWM Work Week Manager PAGE I V
- HUMBOLDT BAY POWERPLANT Pacific ElectricGas and Company DECOMMISSIONING CAPSTONE DOCUMENT JUNE2012 1 PG&E Values Pacific Gas and Electric (PG&E) has established corporate Vision, Goals, and Strategies to be the leading utility in the United States and the Humboldt Bay Power Plant (HBPP) has derived compatible site level objectives to support them. Further, the HBPP Decommissioning Organization has developed Execution Goals and Planning Principles that are aligned with the HBPP Vision, Goals, and Strategies.
To achieve this Vision, PG&E's Goals are "Public and Employee Safety," "Delighted Customers,"
"Engaged Employees," "Rewarded Shareholders," and "Environmental Leadership." The Strategies to achieve these Goals include employees maintaining a "Customer Focus" and striving for "Operational Excellence." In 2009, PG&E established the following five "Business Priorities" to maintain corporate focus on the Vision, Goals, and Strategies:
- Improve safety and human performance
- Deliver on budget, on plan, and on purpose
- Improve reliability
- Drive customer satisfaction
" Champion effective regulatory and legislative policies The HBPP Site Vision is to "complete the decommissioning of HBPP in a manner that establishes a new benchmark for the nuclear industry." The Vision is aligned with the corporate The PG&E Pyramiddepicts the alignment of the HBPP Vision, vision to yield a leading position in the Goals, and Strategies with the PG&E Vision, Goals, and decommissioning realm for HBPP and to promote Strategies the corporate position of a leading utility.
PG&E views the HBPP Decommissioning Project as a long-term opportunity to develop a cohesive team that will accomplish many things. As one of the county's prominent employers, maintaining the company's standing in the local community is critical. In developing a close Partnering relationship that accomplishes our Decommissioning goals, PG&E and the Contractor teams will represent both of our business interests, relationships, and most importantly, reputation. As we move forward together, PG&E and the Contractor will develop and share mutual values that address the corporate Vision, Goals, and Strategies.
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- EHUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT Electri Companye ,
- JUNE 2012 2 Purpose of this Document 2.1 Scope Understanding PG&E is making a significant effort to develop Bid Specifications that are thorough and complete with clear definition of scope and strong emphasis on safety and environmental compliance. PG&E's Bid Specifications will include all HBPP safety and environmental expectations and specific requirements so Bidders clearly understand the culture that is paramount to successfully performing work at the HBPP Site. PG&E expects that all work is performed with safety at the forefront and built into every aspect of work execution, and that all work is accomplished in a manner that will protect the environment and assure the local community that the HBPP Site will be left in a condition that at least meets, if not exceeds all requirements.
The HBPP Unit 3 Demolition Project will present the Bidder with a number of unique challenges and obstacles (apparent, latent, physical, and political) that must be identified, clearly understood, and managed. The Bidder will be expected to understand these challenges, recognize when they may be relevant, and identify and implement constructive approaches and workarounds that will mitigate potential impacts. Project challenges summarized in this document coupled with the coordination, communication, and Contract interfaces, demand a complete and accurate understanding of the scope of work represented by each Contract. It is also incumbent upon each Contractor to have an understanding of work required of others that will interface with and have the potential to affect its work.
To help ensure each Contractor has a clear and complete understanding of its scope of work, each Contractor is required, at the time of bidding, to describe in appropriate narrative detail its understanding of the scope of work involved and to advise PG&E of areas where it feels further scope definition/clarification is needed. Each Contractor should also identify work required of others that will interface with and have the potential to affect its work.
2.2 PG&E and Bidder Interface PG&E desires to establish a positive, cooperative relationship with the Bidder based on openness, fairness, and agreement to work as a mutually productive, project focused team. PG&E believes the work can be performed as a partnership, with both organizations focused on supporting each other to complete the work activities and tasks in a safe, efficient, cost-effective, and compliant manner. PG&E feels that this type of working relationship can be developed through mutual trust, open communications, and establishment and tracking of clear expectations and deliverables, coupled with development and maintenance of a detailed activity-based schedule. This relationship will reflect each organization's good business practices and ethics, and focus on developing fairness to each other.
Additionally, PG&E has established clear expectations for the interface and coordination that will exist between the Bidder and PG&E. The Specification documents clearly identify these expectations, which include, but are not limited to, holding integration meetings (in compliance with ProjectCoordination Specification), coordinating for material sizing, containerizing, truck loading, and shipment of debris (in compliance with the Waste Management Specification), etc.
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HUMBOLDT BAY POWER PLANT PacificGas and
- a*Y*JUNE DECOMMISSIONING CAPSTONE DOCUMENT 2012 Electrioac Company UN 2.3 Audience PG&E developed this version of the Capstone Document (June 2012) to present key project tenets, principles, and requirements to the PG&E Executive Oversight Board, key internal stakeholders, and the pool of bidders who are interested in pursuing a long-term relationship with the company during HBPP Decommissioning. This document is purposefully focused on the critical work that is to be accomplished, as well as general relationships that the successful bidder will begin with HBPP staff as the Decommissioning Work goes forth.
After receiving initial Contractor proposals to conduct the Work, PG&E will better understand the unique approaches and insights those Contractors bring to the table. At that time, PG&E will update this Capstone Document to clarify roles, responsibilities, and expectations based on the information learned from the initial proposals. We will also add depth to the document to explain more fully the working relationships between HBPP departments, the Contractor, key subcontractors, and other consultants.
We will clarify the importance of working within the PG&E organizations to garner institutional knowledge that will be used to develop Contractor Work Plans and Engineering Evaluations to support the Work.
The next document update is planned for August 2012.
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- PHUMBOLDT BAYPOWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT ElectricCompany JUNE 2o,2 3 Scope of Work for Transitioning Site to Civil Works Projects Since HBPP Decommissioning began, and over the past four years, the majority of decommissioning work has been removal of systems and components, otherwise known as the Plant System Removal Phase. In this phase, PG&E established a self-perform arrangement in which PG&E provided direct supervision of a contracted work force performing work on a Time-And-Material basis or on a Cost-Plus basis. This type of contracting arrangement was necessary, and optimum, due to several factors including the dynamics of maintaining specific plant systems in service while others were removed from service and the configuration control that must be maintained; removal of large components with known high levels of radiation that required slow and methodical disassembly; and removal of contaminated systems under special engineering controls and requirements. Careful planning and special measures were taken to accomplish this work with maximum safety to the workers and the public. It is noted that a work scope of this nature, wherein uncertainty exists as to the exact effort that will be required to perform all tasks, lends itself to Time-And-Material or Cost-Plus contracting, which was successfully undertaken by PG&E.
The exception to this approach was Fossil Decommissioning in which the work scope was well defined with little uncertainty associated with system and component removal requirements. Having a well-defined scope with known requirements, PG&E elected to perform Fossil Decommissioning with a principal Firm Fixed-Price contract for the majority of the work. Fossil Decommissioning was very successful, achieving all safety, schedule, and budgetary goals and objectives.
3.1 Transitioning to Civil Works Projects As HBPP Decommissioning transitions from the Plant System Removal Phase, where work scope was dynamic with significant uncertainty, to the Civil Works Projects Phase, where work scope is well defined, a contracting plan similar to that used for Fossil Decommissioning will be implemented. Award of five major work scopes in various stages of development are planned as five separate contracts to five or fewer Contractors. These include Turbine Building Demolition, Nuclear Facilities Demolition and Excavation, Intake and Discharge Canal Remediation, Office Facility Demobilization, and Final Site Restoration, as described in the following section. Each work scope will be supported by detailed and high quality bid specifications with a clear and concise description of work, which will enable PG&E to solicit RFPs that are competitively bid and awarded as Firm Fixed-Price or Fixed Unit Price contracts.
While the scope will be well defined, uncertainties in the work execution details and requirements may exist that could significantly affect the work; the Contractors are expected to use their experience and judgment to anticipate these in preparing their proposals.
PG&E formed an interdisciplinary and broad-based subject matter expert team to develop and vet fifteen technical specifications accompanied by ten administrative specifications. The specifications developed by this technically focused group will define the requirements and criteria to complete the remainder of the decommissioning at HBPP, including a plan for final site restoration.
The Specifications Development Team met every week for twelve months and a Long Term Strategy Team met every week for seven months developing the Level 1 Long Term Schedule and Exit Strategy. A subsequent revision to this Capstone Document will be provided to the Bidders to facilitate transfer of knowledge from these teams to the qualified Bidders. The insights, challenges, and expectations these PAGE I4
HUMBOLDTBAY POWERPLANT Pacific Gas and CAPSTONE DOCUMENT DECOMMISSIONING Electic Company" JUNE 2012 teams achieved during development of the civil works projects will help the Bidders create responsive, well-thought-out bids to complete this complex undertaking safely and successfully.
3.2 Major Civil Work Projects Removal of the boiling water reactor steam and condensate systems from the Turbine Building was completed in early 2012. The contract for asbestos abatement and surface decontamination and demolition (D&D) of the Turbine Building is expected to be awarded in June 2012 with the work scope planned for completion in early 2013. The following five major civil work projects will span the next five years at HBPP:
Turbine Building Demolition-The scope of work includes asbestos abatement (primarily of the Reactor Feed Pump raceways and penetrations, 50,000 square feet of concrete surface decontamination, and open air demolition of a concrete structure, resulting in about 890 cubic yards of debris. It is noted that an RFP for this scope of work was issued April 2, 2012, with Bidder's Proposals due May 29, 2012.
Intake and Discharge Canal Remediation-This scope of work includes mechanical removal of radiologically and chemically contaminated sediment from the Intake and Discharge Canals, demolition of the discharge outfall and levee to Humboldt Bay, demolition of the intake and discharge structures, restoration of levee and coastal trail along the Bay, management and dewatering of contaminated sediments, and water treatment to meet discharge permit requirements. Removal of approximately 400 and 2,500 cubic yards of waste materials from the Intake and Discharge Canals, respectively, is estimated.
Nuclear Facilities Demolition and Excavations-This scope of work includes decommissioning and demolition of all remaining permanent plant structures and facilities identified for demolition.
Additionally, this scope of work includes installation of a slurry bentonite wall to the Unit F clay layer that will encompass the Reactor Building Caisson, Turbine Building foundation, and other deep structures in the Unit 3 area to provide groundwater control and isolation. Note that this scope of work will potentially include removal of the Reactor Caisson and Foundation Piles. The Nuclear Facilities Demolition and Excavations, including the removal of the Spent Fuel Pool, is a significant and diverse scope of work representing the principal contract of HBPP Decommissioning.
Office Facility Demobilization-This scope of work includes removal and/or demolition of office facilities, including buildings and structures owned and leased by PG&E. Most of buildings and structures to be removed are modular or trailer type construction. Leased trailers and structures are to be isolated, disconnected, removed from HBPP, and returned to the owner. Buildings and structures owned by PG&E are to be isolated, disconnected, demolished, and disposed as waste, unless released for salvage or recycle. This scope of work includes an estimated thirty-two (32) building units comprising approximately forty thousand (40,000) square feet.
Final Site Restoration-This scope of work includes development of site grading and drainage, placement of ground cover including vegetation and other surfacing, road construction and repairs, installation of fencing and site lighting, and other final site development work to achieve the required end state condition for PG&E's future industrial use. It includes demolition of remaining miscellaneous structures to support final site restoration plans. The parcel containing the restoration area is approximately one hundred two (102) acres. Main features of this scope of work include removal of buried asbestos containing materials; demolition of reinforced concrete settling basins, truck ramp, and associated piping; soil excavation, backfilling, and compaction; wetlands construction; finish grading; storm drain PAGE I 5
HUMBOLDT BAYPOWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT Eo PacNEi Gas1an Elecbic CompanyN system installation; topsoil placement; vegetation establishment; installation of erosion control features; ground cover installation; final surfacing; and removal of portal monitors and truck scales.
PG&E recognizes that these five large and diverse work scopes include some aspects that are not fully known at time of contract award or uncertainties in the work execution details that may change through unforeseen conditions and, therefore, appropriate contract provisions will be in place. Benefits realized by transitioning to the Civil Works Projects Phase with predominant firm fixed-price/fixed unit price contracting include single or multiple D&D contractors who can coordinate concrete shaving, liner removal, structural removal, and other demolition activities; streamline financial control; reduce PG&E overhead staffing; and provide a specialized Bidder Team with experience from other similar projects.
The overall approach PG&E has taken to complete HBPP Decommissioning has produced proven and successful results at other nuclear and chemical weapons demilitarization D&D projects and programs throughout the U.S.
3.3 Reactor Caisson Removal Option This scope of work involves removal of the Reactor Caisson and Deep Foundations, including subgrade sheet piling and timber pilings beneath Units 1, 2, and 3. This task would occur immediately prior to Final Site Restoration and would involve significant subgrade work (to E1.-66'). While technically feasible, challenges posed by this task include groundwater control, large volumes of soil requiring removal, and ground control around the work area.
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HUMBOLDT BAY POWER PLANT PacificGas nd *.
ODECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 ElectdtcCompany' UE21 4 Contracting Strategies and Opportunities PG&E is assembling approximately fifteen technical specifications accompanied by ten administrative specifications into five RFP packages that will be bid and awarded as five separate contracts. The contract types may be Fixed Overhead and Profit plus actual cost-recovery for direct cost; Lump Sum; or a combination of both, depending on the nature of the scope. Upon completion and approval of the specifications, other contract types and provisions may be considered, such as Unit Price, Target Price, Incentive Fee, etc. PG&E fully understands the complexity and dynamics of the overall work scope and will make contract provisions to address risk areas appropriately. PG&E strongly encourages Bidders to propose innovative approaches and to strategically team to provide a Decommissioning Bidder Team that has the depth, breadth, and expertise to perform all work scopes included in the five RFPs.
However, PG&E does recognize there are unique challenges and opportunities associated with each of the RFP scopes of work and will consider awarding multiple contracts should this be in the best interest of completing safe, environmentally compliant, and efficient work.
Bidders will be provided with a potential, comprehensive Completion Schedule that includes all major work scopes. This Completion Schedule, which PG&E developed through a major effort led by a professional scheduling consultant, includes activity durations and logic. The RFPs will clearly identify activities that must be performed in a specific sequence, key milestones, and coordination/interface activities. In addition to providing a baseline proposal consistent with the PG&E approach, Bidders are encouraged to provide innovative approaches and planning that will achieve the scope of work safely, on or ahead of schedule, and at or below budget. Bidders are encouraged to consider all scopes of work to identify synergies, parallel work paths, and other efficiencies that will achieve optimal execution of the mission.
The working confines of the HBPP site, the numbers of personnel having access to internal PG&E communications, and the available pool of Contractors currently performing and competing for work in support of the HBPP Decommissioning Project make segregation of RFP process and site work activities difficult. Because of this proximity and access to information, there exists a significant opportunity for violation of both the confidentiality and the ethical standards that are necessary to ensure the fairness and equity of the RFP process.
It is PG&E's policy that Bidders participating in an RFP are treated fairly, have equal access to information, and are not subjected to influence (positive or negative) or to offers to perform work under subcontract to Bidders, with the intent or appearance that such relationship will influence PG&E's award of work to a particular Bidder. Such influence extends to individuals who are working on the HBPP site making recommendations (solicited or unsolicited) to Bidders related to the use of specific subcontractors, consultants, or individuals (positive or negative) and/or soliciting Bidders directly for the opportunity to perform work covered under an RFP. If a contractor onsite or Bidder believes that such a recommendation is appropriate and necessary, it must be conveyed to Sourcing and, if PG&E agrees, will be issued by Sourcing to all Bidders in a manner so as not to influence the Bidders as to use, or none use, of such subcontractors, consultants, or individuals. Violations of this Policy shall subject the individual violating the Policy to immediate removal from the HBPP Site.
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HUMBOLDTBAY POWER PLANT SPacific EctricGas, and Company DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 To ensure that Bidders clearly understand the communication policy with respect to the RFP Process, the following instructions shall be included in all RFPs for HBPP Work:
RFP Communicationsbetween PG&E and Bidder- This RFP will be conducted using the PowerAdvocate Sourcing Intelligence Platform ("PowerAdvocate")for this sourcingevent. All communications, including but not limited to, RFP documents, information, announcements, and amendments, will be posted in PowerAdvocate. Likewise, questions or comments between PG&E and Bidders will use the PowerAdvocate Messaging Service. Proposalsand requested documents and information shall be provided by Bidders in PowerAdvocate, Tab No. 2, "Upload Documents," and properly identified as "Commercialand Administrative," "Technical Information," or "Pricing."
During the RFP process, a PG&E Sourcing Representative (to be named) shall be the Bidder's sole point of contact within PG&E. The PG&E Sourcing Representative may, in writing, designate one (1) or more PG&E Representatives to assist in the RFP process. Bidders shall not contact any other PG&E employee or consultantsfor questions regardingthe Projectduring the RFPprocess. Failure to comply with this requirement will result in disqualification.
For questions or matters of general interest raisedby any Bidder during the Q&A period via PowerAdvocate, PG&E will issue an answer during and after the closing of the Q&A period, as it deems appropriate.PG&E may, in its sole discretion, decline to respond to any e-mail or other inquiry outside of PowerAdvocate, and will have no liability or responsibilityto any Bidderfor failing to do so.
All communicationsbetween PG&E and Bidder, including all Bidder submittals (questions,uploads, drawings, etc.) in response to the RFP, shall be in English.
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HUMBOLDT BAY POWER PLANT EPacfic B1 Gas and ewcdcm"onany.
DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 5 Key Project Milestones From a field execution perspective, the D&D Work has been divided into the following key civil works milestones to depict the work and coordination required to exit from the site safely and efficiently.
Key Project Execution Milestones I IETN D SCRPTO 1 4Turbine Building Demolition and Ancillary Infrastructure Projects 2 Demolition and Excavation to Support Slurry Wall Installation 3 Slurry Wall Installation for Groundwater Control 4 Refueling Building Demolition and Spent Fuel Pool Wall Removal 5 Caisson Removal - Option 6 Start of Site Wide Restoration 7 Final Site Restoration and Administrative Close-out PG&E intends to accomplish the major procurement actions associated with the four remaining contracts, as shown in the following table. This table does not include the Turbine Building D&D Contract, which was issued for bid on April 2, 2012.
Remaining Civil Works Project Contracts ISUEF BIDR QU STO AND ANSWER PEROD PRPOAL STWAL DU CONTRACT TITLE Nudear Facilities D&D 28-JUN-12 18-JUL-12 29-JUN-12 through 15-AUG-12 20-AUG-12 Intake / Discharge Canal 28-JUN-12 18-JUL-12 29-JUN-12 through 15-AUG-12 20-AUG-12 Restoration Office Facility 28-JUN-12 18-JUL-12 29-JUN-12 through 15-AUG-12 20-AUG-12 Demobilization Final Site Restoration 28-JUN-12 18-JUL-12 29-JUN-12 through 15-AUG-12 20-AUG-12 PAGE 1 9
HUMBOLDT BAYPOWER PLANT PacificGas DECOMMISSIONING CAPSTONE DOCUMENT Elocflic Company" OE,,
2012 Ec~c C~ aq-JUNE
.10 6 Project Challenges The HBPP Decommissioning Project has unique challenges due to its specific design features, highly congested facilities and underground systems/utilities, contamination issues, limited access, high water table, etc. Furthermore, multiple operations conducted by separate entities (PG&E, various contractors, etc.) are and will continue to occur simultaneously throughout the course of the Project, requiring close coordination, communication, and interface between the parties.
6.1 Weather The climate of the greater Humboldt Bay region, including Eureka and the immediate coastal strip where the project site is located, is characterized as Mediterranean. Summers have little or no rainfall and low overcast and fog are frequently observed. Winters are wet, with frequent passage of Pacific storms, and temperatures are mild.
Eureka Maximum Rainfall Statistics and Several Calculated Return Periods
,0 - em I 00 - a ,Io ;II Average Annual Rainfall (inches) 38.87 1 n/a n/a I n/a Annual Maximum (inches) 67.23 [ 67.70 74.97 189.93 Hourly Maximum (inches) 1.20 1.25 1.47 3.48 Daily Maximum (inches) 5.04 6.19 7.25 17.20 Eureka receives about 75 percent of its average annual rainfall during the rainy season, generally October through April, with greatest monthly totals in December and January. Eureka's average annual rainfall over the 110-year period is 38.87 inches. BJ(, CA JWS Annually, 117 days have Average Monthly Rainfall Inches (a) average precipitation 8 greater than or equal to 638 0.01 inch and 8 days 6 have precipitation 5 greater than or equal to 1.00 inch, based on the 1971 to 2000 period. 3 The design storm event 2 at HBPP is based on a 1 25-year, 24-hour event and a corresponding Jan Feb Mr Apr May Jun Jul Aug Sep Oct Nov Dec rainfall amount of Month 5.1 inches.
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HUMBOLDTBAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT l tic mayJUNE 2012 The rainy season will EUREKA. CA - NWS affect the Bidder's m Mohy Rainfall (t ) ability to load waste 25 into shipping 21.2 containers. A covered 20o .49 waste management facility will be 15 1J3.4 constructed and will Ibe available for 10 packaging and shipping demolition debris and soils.
However, the size of the facility, the area Jon Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec available for staging Month empty and filled intermodals, and the ability for PG&E to ship intermodals during the rainy season may affect the rate at which the structures can be demolished.
6.2 Site Coordination and Congestion The site footprint is extremely small and constricted. There will be other contractors onsite for previously contracted or planned, scope-specific decommissioning activities through 2014. Coordination between all parties performing work onsite is critical for success. Very little space is available onsite for laydown areas, soil stockpiling, demolition debris, and equipment operation, including demolition machines and truck traffic. Significant delays or inefficiencies may be unavoidable due to interference and coordination with other site activities. The constricted space may limit the pace of demolition and excavation. A well-developed traffic plan is essential to optimal demolition sequencing and material handling/management. It should be noted that other contractors will be working within the Refuel Building (RFB). Access to the RFB must be maintained to allow other scope-specific decommissioning work to continue.
6.3 Installation of a Slurry Wall The removal of the Spent Fuel Pool Liner and three (3) of the concrete Spent Fuel Pool Walls are within the scope of work being sought by PG&E. The Reactor Caisson and Foundation Piles removal is part of a six-month feasibility study to develop a practical conceptual plan, schedule, and estimated cost
(+/ 25 percent). This study will be completed by September 2012, for a decision to remove or leave behind the massive concrete structure. However, from the investigative work completed to date, it appears that a slurry wall to approximately one hundred and seventy (170) feet below grade to the Unit F clay layer will be necessary in order to manage groundwater for the removal of the concrete Spent Fuel Pool and/or Reactor Caisson. Proposals should consider an early installation of the slurry wall to mitigate in-leakage to support the Spent Fuel Pool Liner removal in 2014.
The slurry wall and associated dewatering system will enable surgical removal of the contaminated portions of the Spent Fuel Pool concrete structures. Additionally, depending upon the geometry of the slurry wall, large-scale open excavation groundwater control would not be required for removal of the Unit 3 Turbine Building foundation or equipment and floor drains. Finally, early installation would allow dry removal PAGE 1 11
- aHUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT Electric Companyu of the pipe tunnel from the Liquid Rad Waste Building to the Unit 3 Refueling Building and RP Instrument Building. This will provide better control of contaminated materials being removed from below grade.
Prior to installation of the slurry wall, any remaining utilities, such as fire protection, would be relocated outside the slurry wall or, in the case of cold and dark power, re-routed to pass over the slurry wall. In addition, any radiological contaminated soil, including industrial contaminants along the slurry wall alignment, would need to be removed before the wall is installed to avoid contamination spread to lower levels. Other work to be completed prior to slurry wall construction will include geotech drilling to sample for contamination and to define the precise location of the Unit F clay layer, removal of liquid radwaste and piping in the area of the slurry wall, removal of creosoted piles in the slurry wall area, and removal of any foundations within fifteen (15) feet in either direction of the proposed location of the slurry wall.
6.4 Below Grade Obstructions Underground utilities and other underground commodities that have not been appropriately documented may be encountered during installation of a support of excavation system (e.g., slurry wall or piling) or during open-cut excavation. Original plant design drawings of underground utilities and commodities are available, but the installed configurations may not match the design drawings. Systems may have been added or altered without corresponding as-built documentation. Obstructions should be anticipated and contingency plans should be developed for unexpected obstructions in the excavations. The Bidder is responsible for subgrade investigation, identification, and mapping of obstructions to the excavation.
Previously unidentified areas of radiological or nonradiological contamination associated with unidentified underground commodities may also be encountered during excavations. This may require additional measures, including soil sampling and segregation of soil stockpiles, to be applied to appropriately manage potentially contaminated soil that was unexpected and will require increased coordination with PG&E in responding to such discoveries. Contingency plans developed by the Bidder should also anticipate and develop plans for addressing previously unidentified areas of contamination during excavations.
6.5 Deep Excavations Excavations deeper than (+) 8-foot elevation (approximately 4 feet below grade) will require water control. Numerous excavations will be deeper than 4 feet and the Bidder will be responsible for collecting and pumping the water into holding tanks provided by PG&E. Due to the depth of these excavations, shoring may be required for water intrusion and for stabilization of trenches.
Excavation spoils have to be sampled for hazardous constituents before disposition for reuse or offsite disposal. Spoils shall be stockpiled until sample results are received, generally a 14-day turnaround. Soil piles shall be maintained and managed to prevent water runoff and potential cross-contamination. Due to the small footprint of the Site, there is limited space for stockpiling soils. Additionally, PG&E's ability to ship soils will be a factor. Soil stockpiles may accumulate faster than PG&E can package and ship the soil offsite. An integrated plan for soil stockpile management and transportation on and offsite are key to optimal use of resources. In addition, PG&E is required to periodically report to state regulatory agencies on soil management activities, including tracking of soil from initial excavation, through stockpiling, onsite reuse, or offsite disposal. The Bidder is responsible for tracking excavated soil in accordance with regulatory requirements and providing the information to PG&E to be incorporated into required regulatory submittals.
In addition, the Bidder may be limited to the size and depth of excavations by water intrusion, if the volume of water exceeds PG&E's capacity for processing groundwater (~300 gpm). The contractor shall PAGE 1 12
HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT
- Electric Company Uf2, 2012 Elecic nJUNE provide any additional holding tanks or water handling and treatment systems that exceed the capacity of what PG&E provides. The 300 gpm processing capacity is for all water processing needs at the site.
6.6 Demolition Debris, Soil, Sediment, and Cross Contamination Control Demolition debris, soil, and sediment from the canals are likely to accumulate faster than PG&E can characterize, package, and ship the debris for disposal. To reiterate previous challenge statements, limited space for stockpiles could constrain the pace at which buildings can be demolished. Because of the small usable plant site, the Contractor is expected to have controls in place to prevent recontamination of previously cleared areas. This requirement may restrict work at times.
6.7 Intake and Discharge Canal Remediation Bidder challenges include excavation of contaminated sediment and soils in a wetland and coastal condition. This scope of work includes installation of a cofferdam or temporary water control structure to prevent influx of water from Humboldt Bay and other water during excavation and final status survey (FSS) activities. This water control structure shall remain in place until work is substantially complete and stormwater, groundwater, and liquid from dewatered sediment must be managed. Dewatering sediment, containing drip along the shoreline, and preventing cross contamination in a congested construction zone will be a challenge. The outfall pipes to the Bay include asbestos-containing materials that will require special handling and disposal. Excavated sediment is conservatively set at two (2) feet below the impacted portion of the Intake Canal and three (3) feet below the Discharge Canal (approximately 400 and 2,500 cubic yards, respectively) to bound the extent of known contamination.
The Discharge Canal is actively filling with sediment from the Bay and the volume of sediment to be removed and disposed has tripled in the past year. Permits and restrictions on work in wetlands will dictate what the Contractor must perform. These permit applications, which are yet to be prepared, must be submitted for approval.
6.8 Final Status Survey Interface An FSS is required of the site prior to license termination. Effective coordination is required with the FSS organization to schedule adequate time for PG&E to complete FSS work prior to placement of fill. The coordination includes verification work from the Nuclear Regulatory Commission (NRC) and Oak Ridge Institute for Science and Education (ORISE). The specifications provide Contractors with additional requirements for their submittals. For example, when the Contractor completes an excavation activity, they shall not place fill material or permanently obscure existing structures, ground cover, or existing site features until released to continue.
Typically, remediation sampling to confirm acceptable clean up levels will occur during excavations. Just prior to backfill, an FSS will be performed that will include between 25 and 100 percent surface scan of the area along with soil sampling. For smaller excavations, the time to perform will typically be about one day with adequate advance notice. Very large excavations, such as associated with the Spent Fuel Pool removal, could require 5 to 10 days. Close coordination on timing is required to ensure FSS planning and paperwork are prepared, a survey team is available, and adequate advance notice is provided to our regulators to allow for their oversight.
In addition to FSS work to confirm that radiological remediation has been completed, soil sampling for nonradiological chemicals of potential concern will also be required to confirm adequate remediation of nonradiological chemicals and to document the completion of nonradiological remediation to state PAGE I 13
HUMBOLDT BAY POWER PLANT PacificGas.and DECOMMISSIONING CAPSTONE DOCUMENT ElectrcCompany regulatory agencies. This work will be coordinated with the remediation and FSS sampling during excavations and prior to placement of fill.
6.9 License Termination 10 CFR 50.82 (a)(9)(i) requires licensees to submit a License Termination Plan (LTP) at least 2 years prior to the license termination date. HBPP's license probably will not be terminated until 2016 or later, so the HBPP LTP must be submitted to the NRC no later than early 2014. However, rather than wait, PG&E intends to submit the LTP by March 2013. The decommissioning plan regarding underground structures should be finalized by September 2012, and this is the only major item needed to complete the LTP.
After PG&E submits the LTP, the NRC will schedule a public meeting in the Eureka area, in accordance with 10 CFR 50.82 (a)(9)(iii). After PG&E submits the LTP, the NRC expects to take 2 to 3 months to determine if the LTP contains a sufficient level of detail to warrant a full NRC review. At that time, assuming the LTP contains sufficient information, the NRC will issue an LTP meeting announcement for a public meeting to occur within approximately 2 to 3 months. Therefore, if PG&E submits the LTP in March 2013, the public meeting will occur sometime between July and September 2013.
The NRC should take approximately 18 months to review and approve the LTP, which means the NRC will approve the LTP by September 2014. During this 18-month NRC review period, the NRC will most likely issue Requests for Additional Information (RAIs) to PG&E. Thus, PG&E needs to retain personnel during this period to respond to RAIs.
Characterization surveys performed to the rigors of a final status survey (FSS) can be performed prior to submittal of the LTP. After the LTP is submitted, these surveys will continue and are termed FSSs. Some risk is involved with performing surveys prior to the approval of the LTP; however, PG&E has discussed the concept with the NRC; the NRC concurs with this approach, and previous nuclear decommissionings have followed this protocol with success.
Typically for FSSs, survey area reports are submitted to the NRC as they are completed. Once the final FSS survey area is complete, a final gamma walkover is performed over the entire site and the final FSS report is submitted. In recent nuclear decommissionings, the final FSS typically occurs while final site restoration tasks are occurring (seeding, planting, etc.). The NRC will usually be reviewing a few survey area reports at that time.
Until the NRC approves the last FSS report, it is essential that personnel familiar with the HBPP FSS be available to answer questions, not necessarily onsite, but available. The timeframe from completion of the last FSS report until NRC approval of the entire FSS is typically 4 to 6 months. There should be a means for personnel to be able to retrieve archived data and surveys so as to best answer questions.
Based on lessons learned at other sites, one HBPP licensing person who has access to all the FSS information, and 1 or 2 engineers on retainer would provide the most efficient and cost effective staffing. During this time, the one HBPP licensing person will need to work on NRC required annual reports and other licensing issues that arise. However, this person may only need to work half-time onsite at HBPP. Clerical support will be needed to support the licensing effort, and this can be provided onsite at HBPP, or at DCPP.
Following is a realistic FSS milestone process summary:
- 1. Submittal of LTP (March 2013)
- 2. NRC acceptance review of LTP to determine if LTP is ready for NRC technical review, approximately 2 to 3 months after LTP submittal (May to June 2013)
PAGE 1 14
HUMBOLDT BAYPOWER PLANT
'Pacific as add- DECOMMISSIONING CAPSTONE DOCUMENT JUNE2012 Electric Company*h
- 3. Local public meeting, approximately 2 to 3 months after acceptance review determination (July to September 2013)
- 5. Completion and submittal of final FSS (2016 timeframe)
- 6. Gamma walkover (takes approximately 6 weeks after submittal of final FSS)
- 9. Submittal of final License Amendment Request (LAR) to terminate license, immediately after NRC approval of final report (2017 timeframe)
- 10. NRC terminates license, approximately 1 month after final LAR submittal (2017 timeframe)
PAGE I 15
HUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Elec.kic Cmpanj 7 Partnering and Safety PG&E fosters a safety culture and expectation of exemplary safety performance and we expect our Bidders to partner with PG&E and embrace our vision and culture. Protection of personnel and the environment while providing a safe workplace is PG&E's the number one priority. Discovery or identification of safety issues and concerns, injuries, accidents, or near misses are to be reported immediately to PG&E management or the designated point of contact. All personnel are given stop work authority for any activity they believe is unsafe or poses a risk to meeting regulatory requirements.
PG&E requires all PG&E contractor personnel and all sub-tier Bidder personnel to adopt and implement this safety culture in all aspects of work performance, behaviors, and personnel interactions. This philosophy and the continued emphasis on safety, environment, and regulatory compliance shall form the foundation of all activities planned and performed at the PG&E facility.
HBPP's core leadership team, composed of management and supervisors, was established in 2007 to prepare the plant for fuel transfer and they developed a strong leadership ability to perform the work safely and to schedule. The team expanded throughout the year to prepare for the fuel transfer that would transition HBPP into full-scale decommissioning.
Through a very difficult installation, testing, and operation of complex and heavy equipment, there existed a tremendous opportunity for injury.
With a strong management team and an infrastructure backed by a strong safety culture, the fuel transfer was performed safely without injury or incident. HBPP and its leadership team were recognized by earning the 2008 Shermer L. Sibley Award. The Sibley Award is by far the most prestigious PG&E award an organization can earn in recognition of their safety achievements. The Sibley Award has long been recognized as PG&E's highest acknowledgement for excellent safety and health performance. The award criteria are based not only on safety statistical performance, but also on the effectiveness of the organization's overall safety management program.
HBPP has demonstrated a genuine commitment to safety and has developed a strong safety culture throughout the organization. HBPP has subsequently earned the Shermer L. Sibley Awards in 2009 and 2010-three consecutive years.
PAGE I 16
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HUMBOLDT BAY POWER PLANT PacificGas.and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Company Attachments PAGE IA-I
HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Companys Attachment A Contract Details PAGE IA-2
HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Company-As described in the Capstone Document, PG&E intends to award five contracts that, when taken as a whole, will result in the complete demolition and remediation of HBPP Nuclear Unit 3,its support infrastructure and Fossil Units 1 and 2 substructures . To support the contracts, PG&E developed ten (10) administrative and fifteen (15) technical specifications that will apply to one or more of the anticipated contracts, as shown in Table A-i:
011101 Health and Safety Requirements X X X X X 013113 Project Coordination X X X X X 013119 Project Meetings X X X X X 013200 Progress Documentation X X X X X 013300 Submittal Procedures X X X x X 014516 Contractor Quality Control X X x X X 015000 Temporary Facilities and Controls X X X X X 015713 SWPPP Compliance X X X X X 01 57 19 Supplemental Environmental Protection Requirements X X X X X 017401 Waste Management X X X X X 024000 Asbestos Abatement X X X 0241 16.02 Structural Demolition - RCA Structures X 0241 16.04 Structural Demolition - Drywell Liner X 0241 16.05 Structural Demolition - Suppression Cell Liner X 0241 16.06 Structural Demolition - Spent Fuel Pool Liner X 0241 16.09 Structural Demolition - Non RCA Ancillary Buildings X X X 025100 Building Decontamination X 02 6000 Intake/Discharge Canal Remediation X X 02 61 00.01 Subgrade Structural Demolition - General X 026100.02 Subgrade Structural Demolition - Spent Fuel Pool X 02 61 00.03 Subgrade Structural Demolition - Reactor Caisson 3123 19 Dewatering X X X X 3123 23 Fill and Backfill X X X 315600 Slurry Wall Construction X 327100 Final Site Restoration X X Notes:
SWPPP - Stormwater Pollution Prevention Plan RCA - Radiologically Controlled Area PAGE IA-3
HUMBOLDT BAY POWER PLANT SPacific Gas and DECOMMISSIONING CAPSTONEDOCUMENT Ee ctrc CJUnNE 2UNE CONTENTS ATTACHMENT A CONTRACT DETAILS ......................................................................................... A.2 Section A.1 Turbine Building Demolition ....................................................................... A.5 Section A.2 Intake and Discharge Canal Remediation .................................................. A.7 Section A.3 Nuclear Facilities Demolition and Excavations ........................................ A.12 Section A.4 Office Facility Demobilization ................................................................... A.23 Section A.5 Final Site Restoration ............................................................................... A.25 Section A.6 Administrative Specifications ................................................................... A.30 Section 01 11 01 "Health and Safety Requirements". ................................................... A.31 Section 01 31 13 "Project Coordination". ...................................................................... A.32 Section 01 31 19 "Project Meetings" ............................................................................ A.34 Section 01 32 00 "Progress Documentation". ............................................................... A.35 Section 01 33 00 "Submittal Procedures". .................................................................... A.35 Section 01 45 16 "Contractor Quality Control". ............................................................ A.36 Section 01 50 00 "Temporary Facilities and Controls". ................................................. A.37 Section 01 57 13 "SW PPP Compliance". ........................................................................ A.37 Section 01 74 01 "W aste Management". ...................................................................... A.39 Table A-1. Contract Specifications ..................................................................................................... A.3 Table A-2. Discharge Canal Siltation Accumulating Above the 0' Elevation .......... A.Error! Bookmark not defined.
PAGE IA-4
HUMBOLDT BAY POWER PLANT Pacific Gas.and c.anyR
.Electric DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Section A.1 Turbine Building Demolition
Background
Unit 3, including the Turbine Building, was operational until 1976. The Turbine Building has a footprint of approximately six thousand, four hundred and ninety (6,490) square feet (SF). Predominantly reinforced concrete, the two-story structure previously housed the reactor condensers, auxiliary equipment, demineralizers, reactor feed pumps, and steam turbine. Additionally, the building housed the reactor control room and support rooms for access control, radiation protection, and monitoring. Within the Turbine Building, which is situated at E1.+12, the Condenser Bay and Turbine Bay enclose an area measuring approximately three thousand (3,000) SF on a subgrade floor at El.+6. In addition to demolishing the Unit 3 Turbine Building, this Scope of Work includes removing the remaining above grade steel and concrete structures associated with previously demolished Unit 2.
Summary Scope of Work Prior to the Contractor's Notice to Proceed, PG&E will have decontaminated and removed or radiologically fixed the Turbine Building's most highly contaminated areas and systems, such as equipment and floor drains. To achieve PG&E's goal of open-air demolition, the Contractor will remove control room and ancillary equipment and raceways to provide access to the building's walls, ceilings, and floors; abate hazardous materials, including asbestos, lead-based paint, and various universal wastes; and conduct gross decontamination activities (i.e., concrete shaving/scabbling) throughout the entire Turbine Building. Asbestos Containing Material to be removed as waste includes approximately 330 lineal feet of Thermal System Insulation (TSI) Remnant; caulk, wall board patch, or putty; 14,860 square feet of concrete masonry unit; 12 lineal feet of electric wire insulation; 742 square feet of electric pull box; mastic and sound insulation; 975 square feet of precast concrete; 2,082 square feet of vinyl and floor tiles; 4,012 square feet of roofing; 500 square feet TSI; and 1,500 square feet transite siding. An estimated surface area of thirty five thousand (35,000) SF requires decontamination.
Ten percent of surfaces are concrete shaved to a depth of 1/2", 20 percent are shaved to a depth of 1/4",
and 70 percent are shaved to a depth of 1/8".
When PG&E verifies a successful decontamination effort, the Contractor will demolish the Turbine Building. The end state will be concrete slabs at E1.+12 surrounding the approximately three thousand (3,000) SF of open pit remaining at El.+6. There will be a cover structure by PG&E to prevent rainwater from entering the open pit and the features that required protection will have been protected. Access to the adjacent Refueling Building from the Turbine Bay at El.+6 will have been sealed and protected throughout the demolition.
PG&E estimates that the demolition project will result in approximately eight hundred thirty (830) cubic yards of structural demolition debris requiring disposal as exempt, radiologically contaminated waste, or approximately eighty (80) intermodal containers.
Challenges, approach for resolution, and basis for decision Turbine Building Demolition will involve several challenges for the Contractor to address, and those challenges are described collectively in the Demolition Specifications.
Coordination of equipment removal, decontamination, and hazard abatement activities will be complex.
Many of the internal fixtures that must be removed cover areas that require decontamination or abatement. Asbestos abatement activities must be closely coordinated with the decontamination effort, and although PG&E has contracted for a comprehensive asbestos survey, it is anticipated that the Work PAGE IA-5
1Pacific Gas and HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT ElectricCompany" JUNE may uncover uncharacterized structural and ancillary Asbestos-Containing Construction Material (ACCM) requiring abatement.
One area that will require special attention is the Reactor Feed Pump (RFP) Room, which contains significant quantities of ACCM in cabling and pipe insulation. The Contractor must carefully sequence activities in the RFP Room to maintain ventilation controls for asbestos work within the ventilation envelope required for nuclear decommissioning work.
Maintenance of this ventilation envelope is critical, not only for decontamination efforts in the Turbine Building, but also for ongoing decontamination efforts in the adjacent and "downstream" Refueling Building. Any modifications to the building envelope will require close coordination with PG&E to ensure that downstream operations are not affected, and if they are, to allow PG&E to adjust ventilation controls to maintain a negative pressure envelope around the Refueling Building. PG&E anticipates that the Contractor may propose breaching this envelope during Turbine Building Demolition to remove equipment, and even to demolish structural features themselves, particularly the fifteen hundred (1,500) square feet of transite wall panels surrounding the Turbine Building's upper floor. Wall breaches may include building an airlock out of the Turbine Building, a sealable wall penetration, or replacement of large portions of the building envelope.
Decontaminating the structure by concrete shaving and scabbling involves many hazards. These hazards include working in cramped locations,. tripping hazards, vibration and repetitive motion injuries associated with shaving and hammering techniques, hearing protection, noise abatement, protection from hot or cold work conditions, working while in a kneeling squatting or supine position, work on and around scaffolding. The Contractor shall have a program for reviewing planned work, identifying hazards, applying mitigating controls and engineered barriers, obtaining worker feedback, and applying lessons learned feedback to improve work processes.
Another critical piece of the decontamination work includes embedded piping. As part of its earlier nuclear decommissioning efforts in the Turbine Building, PG&E decontaminated the more highly contaminated piping embedded in the concrete structure. Contamination levels may range from a few hundred dpm/cm' beta-gamma on painted surfaces up to a million dpm/cm2 in grouted embedded piping. Upon decontamination, PG&E grouted these piping runs with a lean concrete grout and painted their locations on floors and walls with green and black paint. PG&E spent considerable resources in developing the specifications to create isometric drawings of embedded piping systems and provide enough detail on the piping runs such that the Contractor will be able to assess and bid upon the contaminated piping runs from a human performance perspective, understand the critical nature of this work, and prepare detailed plans for their removal.
As the Contractor nears the completion of the decommissioning effort, PG&E expects to review an Engineering Evaluation-sealed by a California-licensed Civil or Structural Engineer-that addresses the manner by which the Contractor intends to segregate embedded piping in the structure. The Contractor must cut these piping runs from the building, taking care not to disturb the grout, and work under Radiation Protection controls to prevent any releases in the event that the grout did not fully penetrate the piping run before curing.
During Demolition, the Contractor also must protect several subgrade features, including two instrument vaults located near the southeast and southwest corners of the Turbine Building, an old concrete circulating water return tank, and the highly contaminated condensate pump well.
Additionally, the Contractor must protect the Refueling Building and newly installed heating, ventilation, air conditioning (HVAC) equipment in the former Propane Engine Generator (PEG) Room from damage.
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HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONEDOCUMENT JUNE 2012 nElectic Companyu The current Demineralizer Pump Room (Demin Room) at the northeast corner of the Turbine Building will be maintained in place and will continue to support operations in the Refueling Building during decommissioning of that facility. The Contractor must execute a sequencing plan to structurally isolate and protect these features from the Turbine Building, ensuring their functions are not interrupted during the structural Demolition Work.
To manage decommissioning and demolition wastes, the Contractor will be required to erect a temporary waste management structure capable of stockpiling the demolition debris. Prior to Demolition, the Contractor will load waste into PG&E provided containers and seal them under PG&E oversight. When bulk demolition begins, the Contractor will deliver debris to the waste management structure for PG&E packaging and shipment offsite. Under its existing waste management and disposal contracts, PG&E can dispose of approximately 2 to 8 intermodal containers per week (up to 12 in any one week of any month). As the Turbine Building demolition project proceeds, PG&E will work with its waste management contractors and disposal facilities to ramp up the shipping schedule such that future shipping campaigns are much more aggressive.
Contractor Requirements The Turbine Building demolition project is unique in that it will require the Contractor to "surgically separate" the Turbine Building from a licensed Nuclear Facility without causing any damage to that structure during the Demolition Work. To support PG&E Contractor selection for this Work, PG&E is requiring the Contractor-as part of the RFP process-to demonstrate the safe performance of similar Work at nuclear or other industrial facilities where selective demolition was required. Additionally, the Contractor must demonstrate a history of successful decontamination projects involving hazardous materials, asbestos, and universal waste abatement; concrete decontamination; coordination among multiple stakeholders; and interaction with RP and engineering controls.
Contracting Strategy PG&E recognizes that the decontamination work associated with Turbine Building demolition is difficult to scope, based on the unknown contamination levels that may be encountered as concrete shaving operations uncover historical contamination. It is unreasonable to require the Contractor to assume significant risk in the Contracting approach, so PG&E intends to award the decontamination work under a Cost-Plus-Fixed-Fee contracting structure. Structural demolition, being more straightforward and clearly defined, will be priced as a Firm-Fixed-Price task. This will allow PG&E to obtain competitive bids for that work. PG&E will award this contract on the merits of qualifications and price, with qualifications being significantly more important than price.
Section A.2 Intake and Discharge Canal Remediation
Background
There are three canal sections-the Fisherman's Channel, the Intake Canal, and the Discharge Canal.
Prior to shutdown of the HBPP in September 2010, the plant used water from Humboldt Bay (via the Intake Canal) for cooling. Approximately one million (1,000,000) gallons of water went through the plant each day. These three bodies of water are situated on Buhne Point on the eastern shore of Humboldt Bay and they are all considered "Waters of the State" by the State Water Resources Control Board (SWRCB). The canals are surrounded by a mix of residential, heavy industrial (HBPP), northern coastal salt marsh, northern coastal bluff scrub, and landscaped habitat. The bed surface of the Intake Canal is approximately -2.5 m (-8 ft) below sea level. A wetland salt marsh preserve to the northwest of the canal currently drains water into the Intake Canal and receives water from the Intake Canal during PAGE IA-7
HUMBOLDT BAYPOWER PLANT
'PacificGasAdd DECOMMISSIONING CAPSTONE DOCUMENT 2012 Qt .JUNE extreme high tides. The Discharge Canal is located on the northern portion of the HBPP property. There are four unscreened Outfall pipes (48 in. diameter) connecting the Discharge Canal to Humboldt Bay.
The bed surface of the Discharge Canal is approximately -2 m (-7 ft) below sea level. It is surrounded by higher elevation industrial lands to the west and a temporary construction laydown facility to the east.
Low levels of radiological and chemical constituents are known to contaminate the Intake and Discharge Canals. Cesium-137 is the primary radionuclide of concern and chemical contaminants include heavy metals, Polycyclic Aromatic Hydrocarbons in the Discharge and Intake Canals, and Total Petroleum Hydrocarbons (motor oil) in the Intake Canal. The contamination present in the Intake Canal was due to an event (Circa 1973) where radioactivity made its way into the North Yard Drain System and ultimately went to the Intake Canal. The activity present in the Discharge Canal is due to radioactive discharges among other events. Initial characterization identified activity at depths up to two (2) feet. Since then, two factors have entered into the equation altering the initial assumptions: radioactive discharges have continued which would likely have increased the activity present in the sediment; and silting has occurred in the Discharge so now the activity would likely be at greater depths. Remediation and restoration of the canals is planned for early 2014 when the permits are in place by PG&E.
The remediated canal end state is a canal similar in shape and dimension to the original configuration for transition to Final Site Restoration. There may exist an opportunity for this Contractor during or after the intake and discharge canals are remediated to bid an additional scope of work to dredge the Fisherman's Channel and repair the tidal gates and return the area to a system of salt, intertidal, and freshwater marshes.
Summary Scope of Work This Scope of Work for a qualified Contractor skilled in remediation of wetlands and tidal areas includes mechanical removal of clean and radiologically and chemically contaminated sediment from the Intake and Discharge Canals, demolition of the discharge outfall and levee to Humboldt Bay, demolition of the intake and discharge outlet structures, restoration of levee and coastal trail along the Bay, management and dewatering of sediments, transfer of water, and obtaining permits from regulatory agencies to perform the work. The Outfall consists of four (4) sixty (60) foot long forty-eight (48) inch diameter asbestos bonded pipes and concrete structure. PG&E estimates that the demolition project will result in approximately 6,488 cubic yards of structural demolition debris requiring disposal as exempt, radiologically contaminated waste, or approximately 590 intermodal containers.
As an option, the Contractor may be tasked with dredging the Intake Canal at Fisherman's Channel and repair of the tidal gate. The dredging project consists of removing the existing tide gates, demolition of the culvert and installation of two (2) new forty-eight (48) inch diameter tide gates. The estimated dredge quantity for Fisherman's Channel is 21,000 cubic yards based on a length of 933 yards, width of 20 yards and thickness of 1.1 yard at a depth of 7 to 10 feet. Dredged material is to be re-used to mitigate the Intake Canal and surrounding wetland areas.
It is expected that the Intake Canal may be remediated first after the Contractor has installed dewatering equipment. Space for equipment laydown and staging is provided south of the Intake Canal.
PG&E anticipates that a cofferdam or tidal wall will be constructed in the canal east of the walking bridge surrounding the known area of concern to prevent tidal flow into this portion of the canal. Prior to removing sediment, liquid in the dammed portion of the canal may be pumped over the cofferdam to the Bay side of the canal. Once soil remediation starts, liquid in the intake canal will be removed or pumped to the GWTS, and the water level will be managed to minimize freestanding liquid while maintaining moist sediment. The Contractor shall ensure turbidity is minimized to the extent practical PAGE IA-8
HUMBOLDT BAYPOWER PLANT Pacific Gas.and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 ec t pi for liquid transferred to the GWTS. PG&E expects that contaminated sediment up to a depth of two (2) feet below the bottom of the canal will require removal and dewatering on equipment outside the canal. Liquid may be collected and pumped to the GWTS or allowed to drain back to the canal and pumped to the GWTS, and the qualified Contractor shall ensure turbidity is minimized. Removal and disposal of the approximately sixty-seven (67) foot long by fifty-two (52) foot wide by twenty-six (26) foot tall concrete intake structure is included in the scope. PG&E anticipates that impacted riprap within the cofferdam area will be remediated. Replacement soil and riprap will be installed to return the canal to its former shape and dimensions and the Intake Canal will be returned to use.
Space for dewatering equipment laydown and staging is provided east of the Discharge Canal. PG&E anticipates that GWTS effluent will be rerouted to the Humboldt Bay during discharge canal remediation and a cofferdam or sea wall will be constructed in the Bay to prevent tidal flow to the discharge canal.
The Contractor shall provide an engineering analysis that evaluates cofferdams, filter presses, silt curtains, and other engineered features to minimize flow into the canal during remediation and turbidity in transfers to the GWTS. Liquid in the canal will require removal or pumping to the GWTS and the water level will be managed to minimize freestanding liquid while maintaining moist sediment. The asbestos containing outfall piping, the riprap around the outfall, and up to three (3) feet of sediment will require removal. The Contractor shall coordinate sampling and survey requirements closely with PG&E and shall allow up to ten (10) work days for sample results from PG&E. Remediation with Radiological and Chemical sampling will be conducted around the outfall to confirm License Termination Plan (LTP) and chemical remediation requirements are met. Sediment and riprap determined to meet FSS and LTP requirements may be used as fill material. The Nuclear Regulatory Commission (NRC)/Oak Ridge Institute for Science and Education (ORISE) will provide oversight and verification on canal remediation.
The canal will be returned to its former shape and dimension including an impermeable Geotextile on the canal side to mitigate or minimize future tidal flow into the canal.
Final site restoration of the canals includes restoration and mitigation of the surrounding site areas.
Restoration may include freshwater wetlands at or above the +12 foot elevation. The canals may be remediated from the +12 foot level with Upland Habitat sloping downward to Coastal Salt Marsh to Mudflats to areas open to Humboldt Bay. Restoration of the canals will require significant backfill (some excavated material from remediation may be retained and used as backfill), close interface with FSS/NRC/ORISE and is detailed in the section on Final Site Restoration.
The canals will be seined at the start of remediation to remove animals and sensitive species such as the tidewater Goby (Eucyclogobius newberryi) and relocate them to the Bayside of the canal. Permit conditions and integration with regulations such as Environmental Protection Agency Clean Water Act 316(b) apply specific restrictions on sensitive animals and plants. Any work done in the Discharge Canal would likely happen immediately after sediment removal so there would be no opportunity for special-status species to colonize the Discharge Canal. In addition, any eelgrass that may have been present in the Discharge Canal would be removed as part of the sediment removal and, because the loss of eelgrass would already be accounted for under the HBPP decommissioning permitting, there would be no further need for surveys or mitigation.
PG&E anticipates that contaminated sediment to the bottom of the discharge canal will require removal and that up to three (3) feet of clay liner and soil at the bottom of the canal is removed/remediated and dewatered. Contamination is not expected beyond the clay liner. Liquid from dewatering operations may be collected and pumped to the GWTS or allowed to drain back to the canal and pumped to the GWTS. The Contractor shall ensure turbidity is minimized to the extent practical for liquid transferred to the GWTS. Removal and disposal of the approximately twenty-seven (27) foot long by thirteen (13) foot PAGE IA-9
- iHUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT EBectdc Company- JUNE 2012 wide by eighteen (18) foot tall concrete discharge structure is included in the scope. PG&E anticipates that the general sequence will be to remove sediment from the outfall end of the canal toward the head end of the canal, then removal of the riprap. Riprap may be washed by the Contractor, surveyed by PG&E, and returned for use if FSS/LTP limits are met. Radiological and Chemical sampling will be conducted throughout the discharge canal during remediation activities to confirm LTP and chemical remediation requirements are met. The sides of the canal must be conditioned to meet minimum safe sloping per the Work Plan. Additionally, the surrounding areas will require reconditioning with slope and drainage toward the canal to prepare returning the canal to use.
Challenges, Approach for Resolution, and Basis for Decision Water management will be a challenge during remediation. Prior to canal remediation, PG&E and other Contractors will terminate, mitigate, or redirect all facility drainage to the canals to minimize active inflow to the canals except for groundwater, stormwater, or tidal flows. Contaminated runoff or discharge to the canals needs to be prevented after remediation to prevent re-contamination of the canals. PG&E will provide a GWTS and the Contractor shall provide the capability to pump or transfer up to one hundred (100) gpm groundwater, stormwater, and liquid from dewatered sediment with turbidity less than six hundred (600) NTU to the GWTS. The approximate distance from the Intake Canal to the GWTS is 1,300 feet. The Contractor shall provide temporary piping and pump or other transfer system to transfer liquid from dewatered sediment to the GWTS. The Contractor shall protect the piping system where it crosses roadways or other traffic areas. Initial dewatering the canals prior to disturbing sediment may be pumped to the Bay. Approximate volume of water in each canal is 1,000,000 gallons based on an average depth of seven (7) feet. The Contractor will be required to have a contingency capacity to handle and dispose Wastewater that cannot be routed to the GWTS. Underlying layers such as Hookton sands may affect the groundwater flow rate into the canals and the Contractor shall design the dewatering system, filter presses, cofferdam and silt curtains in sections if needed so as not to exceed the 100 gpm flow to the GWTS.
Due to active siltation of the canals, excavation of the waste volume is a challenge. The Outfall structure consists of asbestos bonded metal pipes and concrete structure. The volume of silt and sediment in the Discharge Canal has tripled in the past year as summarized in Table A-2. A percentage of the excavated silt, sediment, and riprap is expected to survey as clean material meeting FSS requirements and may be re-used as fill material at HBPP.
Table A-2. Discharge Canal Siltation Accumulating Above the 0' Elevation RAG(T PR211 JN 201 OC 201 FE 201 APR 201 I 0-1 1891 217 292 40 435 I 1-2 29 57 101 228 276 2-3 0 2 6 49 43 3-4 0 0 0 4 1 Total Yd3 218 276 399 685 755 Coordinating remediation work in wetlands habitats, maintaining compliance with permit conditions, and protecting personnel and the environment will be a challenge. Wetland habitats on and adjacent to the Site support a diverse assemblage of wildlife that forage, nest, and seek refuge in these habitats.
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HUMBOLDT BAY POWER PLANT PacificGas.and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Elec C Marine and shoreline habitats adjacent to the Site, including the intake canal and the discharge canal, serve as foraging and loafing habitat for a variety of birds dependent on aquatic habitats (e.g., osprey, cormorants, gulls, and herons). Harbor seals have been observed using the Site for resting or feeding.
Special-status plants and animals have been documented in the Site vicinity and include plants (Humboldt Bay owl's clover and Point Reyes bird's beak), and one species of special-status animal (Northern red-legged frog). Additionally, the California brown pelican and bald eagle have been observed foraging directly adjacent to the Site. Contractor shall protect wetlands and habitats in accordance with the requirements of regulations, permits, and authorizations applicable to the Project.
"Wildlife Observation Forms" shall be used to document wildlife encountered during Work.
Coordination and integration with demolition Work is a challenge. Surveying, stockpiling, and reuse of clean excavated material will be limited to available space. The end state for the canals is being negotiated with the stakeholders. This specification requires the post remediation canals be returned to a stable shape and dimension similar to the original configuration. The Discharge Canal levee and coastal trail is rebuilt and left in a configuration that is coordinated and turned over for Final Site Restoration.
Contractor Requirements The Contractor shall furnish materials, equipment, labor, and supervision necessary to set up and perform mechanical excavation of the impacted sediment until cleanup goals (referred to herein as Derived Concentration Guideline Limits) are achieved, and the specified permits are provided. Based on the accumulated sediment in the discharge canal, it is estimated that approximately 400 and 2,500 cubic yards of waste materials will require removal from the Intake and Discharge Canals respectively.
Removal or isolation of the intake and discharge circulation cooling water piping by PG&E or other Contractors are precursors to canal remediation. PG&E will provide limited cold/dark and temporary power but the Contractor shall provide all supplemental portable power. The Power pole at the head end of the discharge canal will be removed or rerouted by PG&E around the perimeter of the canal.
PG&E plans to have permits in place and approved to support canal remediation early 2014.
Remediation of the canal wetlands is unique in that it will require the Contractor to remove sediments methodically and carefully without causing damage to the environment. To support PG&E Contractor selection for this Work, PG&E is requiring the Contractor to demonstrate the safe performance of similar Work at nuclear or other industrial facilities where wetland restoration and remediation was required.
Additionally, the Contractor must demonstrate a history of successful remediation projects involving coordination among multiple stakeholders and interaction with regulatory permit and engineering controls.
PG&E recommends remediation of the canals under wet or moist conditions. The contractor shall propose wet or dry remediation alternatives for PG&E to evaluate and explain briefly why one option was not selected/preferred. If both are options are bid, the Contractor shall describe the advantages and disadvantages for consideration by PG&E.
Contracting Strategy The Contractor selected for this work requires extensive experience in obtaining permits from stakeholders/regulatory agencies for similar work in contaminated environments adjacent to wetlands.
Remediation of the canals is a unique situation because obtaining permits is arduous and complicated requiring experience in negotiating site-specific requirements that are implementable and acceptable.
For example, the final volume of clean and contaminated water, sediment, and riprap will evolve over time; the volume of contaminated material generated will need to be limited, but balanced with progress and cost; and the sequencing of events with the overall demolition project may affect means and methods. Once an area is considered remediated and ready for confirmation surveying and PAGE IA-11
HUMBOLDT BAY POWERPLANT DECOMMISSIONING CAPSTONE DOCUMENT
,EleatricCompaoJUE '1 JUNE2012 sampling, the Contractor dewatering system must be capable of maintaining the water level as specified over several days to perform this work. Prior to implementation of the work, the Contractor selected must prove their system will be successful through experience in very similar situations or with site-specific evaluations. This is necessary to prove the cesium-137 in the canals has been remediated to levels agreed to with regulatory agencies.
Additionally, Contractors need to demonstrate diverse qualification working with multiple stakeholders including regulatory agencies during demolition (numerous local, state and federals agencies, Department of Fish and Game, U.S. Army Corps of Engineers, etc). Obtaining consensus and buy-in from all the parties is essential to prevent delays and may require mitigation measures to be conducted.
Section A.3 Nuclear Facilities Demolition and Excavations
Background
HBPP Unit 3 was a 65 MWe Boiling Water Reactor (BWR). Initially licensed by the Atomic Energy Commission, the unit was constructed between November 1960 and August 1963 when it began commercial operations. Unit 3 was shutdown in July 1976 for refueling and seismic upgrades. The unit never restarted and, in June 1983, PG&E announced that the unit would be decommissioned. Prior to the Contractor's Notice to Proceed on this Scope of Work, PG&E will have substantially decontaminated and removed or radiologically fixed the most highly contaminated areas and systems within the RCA Structures, such as equipment and floor drains, primarily within the Refueling Building and the Liquid Radwaste Building.
It is PG&E's goal to achieve open-air demolition by a strategy of removing contaminated inventory from Unit 3, shrinking the contaminated footprint within the RCA in a systematic approach that reduces the square footage that requires management, and preventing cross contamination of remediated areas.
Removing contaminated materials includes the removal of all components, equipment and waste debris from the structures and buildings within the RCA. Next, all remaining equipment, materials, and components are removed and packaged in intermodals for waste disposal. Once cleared of equipment, the concrete surfaces of Unit 3 are concrete shaved and scabbled to remove the licensed radioactive material and meet the open air demolition limits. Work is coordinated and integrated with removal of the Suppression Cell, Drywell, and Spent Fuel Pool liners. Activated concrete around the drywell is removed along with other activated components. Building ventilation is maintained during the decontamination phase. The demolition project begins with the installation of a slurry wall around the Refueling Building and other structures to control the influx of groundwater during excavation and demolition of below grade structures. Water management during demolition of below grade structures will be a significant challenge to keep excavated areas from filling with water. Installation of the slurry wall is a precursor to removal of subgrade foundations and liners on walls against soil.
PG&E's proposed demolition of Buildings generally starts at the northernmost area of the RCA and moving south, which will allow the subgrade demolition work to follow the Work toward the plant's main access road. Working from the North or Upper Yard at elevation + 28 feet allows this area to be remediated before moving to areas in the South Yard at the +12 foot elevation. This sequence reduces the chance of contamination being entrained in debris and soil remediation and flowing from higher to lower elevations. Once the slurry wall is installed, groundwater intrusion minimized, and the liners removed, the below grade structures can be removed including the spent fuel pool walls.
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' f DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Elect Company Summary Scope of Work The Nuclear Facilities Demolition and Excavations work scope, which encompasses the majority of the work to be accomplished during the Unit 3 D&D Project, is a significant and very diverse Scope of Work, and represents the principal contract of the HBPP Decommissioning. This Scope of Work includes decontamination, decommissioning, and demolition of all remaining permanent plant structures and facilities, including removal of the Spent Fuel Pool. Additionally, this Scope of Work includes installation of a slurry bentonite wall to the Unit F clay level, approximately 170 feet below grade, which will encompass the Reactor Building Caisson, Turbine Building foundation, and other deep structures in the Unit 3 area. This slurry wall is required to provide groundwater control and isolation. Note that this Scope of Work will potentially include removal of the Reactor Caisson and Foundation Piles.
PG&E envisions the demolition project beginning with the installation of a slurry wall around the Refueling Building to control the influx of groundwater during excavation and demolition of below grade structures. Water management during demolition of below grade structures will be a significant challenge to keep excavated areas from filling with water. Demolition of Buildings generally starts at the northernmost area of the RCA and moving south, which will allow the subgrade demolition work to follow the Facility Demolition Work toward the plant's main access road. The Contractor may propose a different approach if it will meet project goals, protect the deep subgrade features that must be removed under a future contract, or provide conditions that are more favorable for the Work. Once the reactor pressure vessel drywell asbestos abatement is complete by other Contractors, removal of the drywell and activated concrete can start. After slurry wall installation, the spent fuel pool liner and concrete pool cell, and suppression cell liner are removed. Unless the Contractor proposes good reasons to do otherwise, the Refueling Building should be the last RCA Structure standing, because it shelters the critical deep subgrade structures.
The end state for this Scope of Work is that all identified buildings, structures, buried piping, soils, etc.,
as mentioned previously and described as follows, have been removed, the associated FSS surveys have been completed, backfilling is complete, and Site Restoration can commence. This Scope of Work does not include the FSS surveys or demobilization of office facilities except those that are an integral part of the permanent plant structures.
This specific work to be completed for the Nuclear Facilities Demolition and Excavation Project is described in detail in the following paragraphs.
Building Decontamination 02 51 00-This Scope of Work will include removal of hazardous, nonhazardous, and radiological contaminated materials associated with above grade and below grade buildings and facilities including, but not limited to, heavily reinforced concrete slabs, walls and ceilings, significant metal liners, various sub-grade tunnels and vaults, equipment, above ground and underground piping, electrical conduit, soils, paving, and debris. PGE has performed proof-of-concept trials and verified the effectiveness of a Pentex concrete shaving unit; this is the preferred method for decontamination of surfaces. Concrete surfaces in the Solid RadWaste Building, Low Level Waste Storage Building, High Level Vault, Liquid RadWaste Building, Refuel Building, and the Hot Machine Shop. With the exception of the Refuel Building and the SAS Building, all structures will be removed.
To meet open air demolition criteria, PG&E proposes that all contamination and potentially contaminated surfaces be shaved or scabbled a minimum of 1/8 inch, with the more contaminated surfaces being shaved up to a depth of Y1/2 inch. Approximately seventy thousand (70,000) square feet of concrete surfaces in Unit 3 require concrete shaving. Approximately ten (10) percent of concrete surfaces are shaved to a depth of Y2 inch, twenty (20) percent of surfaces to 1/4inch, and the remaining seventy (70) percent are PAGE IA-13
HUMBOLDT BAY POWER PLANT EPacific Gas AndJUE21 DECOMMISSIONING CAPSTONE DOCUMENT UNE Electric Companyq shaved to a depth of 1/8 inch. Surfaces that are not conducive to shaving will be physically decontaminated by hand wiping. Below grade facilities such as the Refuel Building will be decontaminated to meet Derived Concentration Guideline Limits to pass Final Status Survey and will be left in place.
In some areas where concrete shaving and scabbling is not possible, contamination may be fixed by sealants, fixatives, or plastic sheets. Embedded contaminated piping has been air gapped and grouted by PG&E. Removal of all contaminated piping will be accomplished under script radiological controls approved by RP.
Asbestos Abatement 02 40 00-Asbestos abatement is generally the first step in the demolition process and shall occur before decontamination of the concrete walls and demolition of the structures. The amount of asbestos containing material to be removed from Unit 3 structures is considerably less than the amount of asbestos in the Turbine Building. Asbestos Containing Material to be removed as waste includes TSI Remnant, caulk, penetration patch, wall board patch or putty, wall coatings, concrete masonry unit, electric wire insulation, mastic and sound insulation, precast concrete and asbestos bonded metal pipe, roofing, and transite siding. A complete list of asbestos containing materials will be made available to the Contractor. From a risk perspective, managing the radiological risks along with the risks associated with asbestos abatement, need to be coordinated and integrated through the Work Control Process. All applicable regulations, requirements and controls for mitigating asbestos, radiological, and other hazards apply for protecting workers and the public as well as safely managing the Work environment. Where conflicts exist, the more stringent regulation, requirement, or control shall apply. The intent of this Asbestos Abatement Work scope is to remove all asbestos and ACM from HBPP Unit 3 Buildings, Structures, Facilities, Systems and Components, pass visual inspections and air sampling tests, and make areas acceptable for occupancy or demolition with no PPE for asbestos.
The Contractor's Abatement Work Plan shall include an estimate of the volume and mass of asbestos waste expected to be generated along with an estimate of the volume and mass of secondary waste to be generated associated with the abatement Work. Any additional asbestos identified by the Contractor within the HBPP Buildings and Structures shall be removed so it will not be a source of asbestos fiber exposure during subsequent Work activities. Equipment, material, and facilities free of asbestos will be appropriately protected during the removal process so no present or future exposure may occur from the asbestos that is abated. The abatement Work shall constitute a portion of the Work. All Work required achieving the intent of this asbestos abatement Work shall be provided by the Contractor unless specifically assigned to PG&E or others.
The Contractor shall furnish all labor, materials (including scaffolding), services, insurance, license fees, and equipment necessary to carry out the abatement Work, including abatement operations and packaging of all asbestos material for disposal, in accordance with EPA, Air Pollution Control District (APCD), Cal OSHA, DOT, and applicable state/local regulations. Abatement Work within the RCA will include materials designated for one (1) time use. Once brought into or used in the RCA, and unless controlled and coordinated with RP for free release, all materials, clothing, tools, equipment, and other items will be disposed as radiologically contaminated secondary waste. Contractor shall not be entitled to additional compensation or consideration for any such items that RP determines is unsuitable for free release.
Structural Demolition - RCA Structures 02 41 16.02-A number of structures that exist within the RCA will be demolished to grade, with those Work activities coordinated with subgrade structures demolition and removal of contaminated soil. With the exception of the Caisson, most concrete structure and footings shall be removed by the Contractor.
Buildings included within the RCA Structures specification include the following:
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" Solid RadWaste Building, Upper Yard (44 tons)
" Low Level RadWaste Building, Upper Yard (100 tons)
- Liquid RadWaste Building, Upper Yard (160 yd 3; 320 tons)
- Recombiner/SAS Building, North Yard (165 yd 3; 322 tons)
- Plant Ventilation Stack Base, North Yard (38 yd 3; 75 tons)
- Refueling Building (650 yd 3; 1,300 tons)
- Hot Machine Shop (55 yd 3; 110 tons)
" Miscellaneous RCA Structures, including the Stack Particulate Alpha Monitoring System (SPAMS)
Shed, Ventilation Fan Base, HVAC Ventilation Fan and Appurtenances, Multi-Zone Fan in the PEG Room, Above Grade Pipe Racks and Conduit, Cold and Dark Power Systems, and Other Above Grade Utilities Together, these structures and systems include approximately 8,170 yd 3 of concrete, steel, and other demolition debris. In total, this is about 770 intermodal containers that will be shipped offsite.
Prior to the Contractor's Notice to Proceed, PG&E will have decontaminated and removed or radiologically fixed the Turbine Building's most highly contaminated areas and systems, such as equipment and floor drains. To achieve PG&E's goal of open-air demolition, the Contractor will remove equipment to provide access to the building walls, ceilings, and floors; abate hazardous materials, including asbestos, lead-based paint, and various universal wastes; and conduct gross decontamination activities (i.e., concrete shaving/scabbling) throughout the RCA Structures.
Structural Demolition - Drywell Liner 02 41 16.04-The dry well vessel is approximately sixty-seven (67) feet, ten (10) inches high and seventeen (17) feet, six (6) inches in diameter and resides in the center of the reactor caisson structure. The shell (0.61 inch thick), lower heads (reinforced steel one and one half (1%) inches thick), vent pipes, and ring header are constructed of SA-201 Grade B steel produced to SA-300 Specifications. The dry well is surrounded three hundred and sixty (360) degrees by reinforced concrete (Bioshield wall).
The Bioshield wall in most areas is three (3) feet, ten (10) inches thick, but thinner sections exist, backed up with higher density (lead) concrete to protect maintenance workers during reactor operation. Other areas facing north toward the access shaft have various thicknesses of extra dense lead concrete.
Some areas of the Bioshield wall are neutron-activated, specifically in a region extending from the reactor core radially outward. The activation concrete extends about eighteen (18) inches into the concrete and about two (2) feet above and below that core region (core region is from El. -24 to -30.7) representing a cylinder twelve (12) feet high.
The Dry Well Liner shall be removed, size reduced, and packaged, including the bottom-hinged hatch but not including the bolted top head, which was removed previously by others. There are several methods that can be employed to sequence the cutting, rigging, and removal of the Dry Well Liner. These include pieces being cut free, rigged and lifted individually; stacked and rigged and lifted in campaigns; or pre-cutting over entire vessel, lifting eyes attached and final cutting and lifting performed at the end. It should be noted that on the outside face of the dry well, there are two circumferential T-Beam "rings",
ST 12WF38, approximately located at -3'-4.125" and -7'-10.125". At each support, they are joined by a PAGE IA-15
HUMBOLDT BAY POWER PLANT Electic Company DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 6" x 3/8" thick steel plate. These T-Beams are in opposite orientation: One has the web welded to the dry well, the other has the flange welded to the dry well. The T-Beam rings provide a substantial point of connection between the liner and the Bioshield wall that will require appropriate methods in order to separate the liner from the wall. The activated portion of the concrete shall be removed to meet open-air demolition limits. Removal of other concrete within the dry well, such as the reactor vessel supports, is not planned. The remaining concrete surfaces will be decontaminated by shaving/scabbling of the remaining underlying concrete.
Concrete, steel, and miscellaneous appurtenances remaining within the Dry Well Liner shall be dispositioned. The embedded portions of the reactor vessel support anchors and the embedded portion of the nelson studs in the Bioshield Wall may remain and be cut off flush with the inner face of the Bioshield Wall. Piping stubs attached to the outside of the Dry Well Liner and projecting through the concrete Bioshield Wall will be dispositioned. Miscellaneous hazardous material consisting of lead and lead caulking outside the Dry Well Liner and within Bioshield Wall penetrations shall be removed.
Cooling Coils (one [1] inch schedule 80 ASTM A-53) embedded in grout on the Dry Well inner wall, in the approximate twelve (12) foot high cylinder area of activated concrete is to be removed. Decontaminate the inner concrete surface of the Bioshield Wall exposed after removal of the Dry Well Liner to an estimated depth of 1/8" (with the exception of the approximately eighteen (18) inches removed from the twelve (12) foot high cylinder around the fuel zone). A range of approaches to remove the activated concrete region include remotely operated demolition tool hung from the overhead crane on a platform or jacking a platform into place. A water misting system is anticipated to manage demolition dust. The material could be collected at height and removed, allowed to drop to the lowest level of the caisson or a funnel arrangement could be constructed to direct broken concrete into bags for removal or the bottom of the caisson could be closed off the work completed and then the bottom opened to allow loading into disposal bags/boxes.
When the dry well is turned over to the Contractor, the Reactor Pressure Vessel and associated systems will have been removed, asbestos in the dry well and removal of the Asbestos containment tents at EL 12' and EL -66' will be complete, mechanical and electrical systems within the dry well will be removed, and previously installed dry well scaffold system will have been removed. Thus, the Contractor will be required to design, supply, and installation of a scaffold/platform/ladder system that is easily removed by crane when not in use.
Structural Demolition - Suppression Cell Liner 02 41 16.05-The Suppression Pool and associated liners are part of the Reactor Caisson. The suppression chambers are twelve (12) feet six (6) inches wide by forty-nine (49) feet high with a four (4) foot exterior wall and a three (3) foot, ten (10) inch interior wall.
The suppression chambers are constructed of reinforced concrete and lined with carbon steel plate. The vertical carbon steel plates were used as an integral form for the concrete.
Personnel access to the Suppression Pool area is restricted and requires detailed planning to ensure optimal time on tools. Personnel access is via a man lift that is restricted to three (3) personnel at a time.
Equipment, materials, and waste load out is via a physically constrained approximately thirty (30)-inch by thirty (30)-inch opening, located in the access shaft, twelve (12) feet from the floor.
The Scope of Work for this task involves removal of the Suppression Pool Liners including attached steel commodities, shaving the underlying concrete (as required) to support open air demolition, removal of the concrete floor and French drain rock, removal of six (6) inches of the tremie seal, and sealing the system to prevent groundwater intrusion into the Suppression Pool area.
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HUMBOLDT BAY POWER PLANT Pacific Gas and Pafi GsAdJUNE DECOMMISSIONING CAPSTONE DOCUMENT 2012 ElecfticCompany~
Anchorages embedded in concrete shall be left in place. The suppression chambers, commonly referred to as the East and West suppression cells, are located concentrically around the reactor drywell creating a three hundred (300)-degree partial annulus. The suppression chambers extend from elevation minus seventeen (17)-feet zero (0)-inches to minus sixty-six (66)-feet zero (0)-inches. All surfaces of the suppression chambers, including floor, walls, and ceiling, are lined with 3/16 inch welded steel plate.
The carbon steel liner was originally installed to protect the concrete floor from blow down loads imposed by the Design Basis Accident. Currently, the liners serve to help prevent water from leaking into the suppression cells.
The suppression chamber walls provide structural support for the entire suppression chamber, reactor pedestal, refueling building, and plant stack. The Contractor's demolition approach shall ensure that the suppression chamber walls continue to provide required structure support.
When the suppression chamber is turned over to the Contractor, the equalizing header and downcomer pipes will have been removed and internal cleanout, housekeeping, and fixing any identified contamination will have been conducted. During operation, the water was maintained at El. -48 and the water was treated with potassium dichromate as a corrosion inhibitor. Trace amounts of potassium dichromate exist on the steel surfaces as well as radiological contaminants. The liner surfaces below El. -56 were painted with white epoxy paint to prevent spread of chromate contamination and improve lighting. Historically, the Suppression Chamber was a highly contaminated area; however, it is expected that the suppression chambers will have low dose rates.
There are two basic avenues to approach this work the first being from the bottom of the vertical access shaft (which may need enlarged) or one could gain access from the top by removing roof sections. It may be possible to install a 'construction' elevator. The work is expected to be challenging as the confined spaces are narrow, tall, have limited ventilation and lighting and, the work will be performed and all surfaces (walls, ceiling, floor).
Water management associated with the suppression pool liner removal activity will be a significant challenge. The Suppression Pool area historically had a groundwater inflow rate of 5 to 14 gallons per minute exacerbated by seismic activity. The flow was suppressed by installing a pumpable grout 'dam' into the French drain. The flow is expected to resume when the liner, concrete floor, tremie seal, and French drain are remediated. The assumed contaminated groundwater inflow requires management during work, at the end of shifts and at turnover back to PG&E. The slurry wall installation, described elsewhere, is expected to support mitigation of the water inflows.
Structural Demolition - Spent Fuel Pool Liner 02 41 16.06-The scope of this task is the removal of the Fuel Pool Liner and decontamination of the concrete structure making up the Fuel Pit and Cask Pit. The subgrade caisson wall adjacent to the pits and vaults must be left in place for sub-grade Fill and Backfill.
After Pool Liner removal, the wall behind the liner will be characterized by PG&E and decontaminated by Contractor to ensure levels do not exceed the open air demolition limits or Derived Concentration Guideline Levels (DCGLs).
The Spent Fuel Pool liner was installed in part to manage the outflow of water into the surrounding environment. The amount of groundwater that has flowed into the SFP concrete area is uncertain, however, it is known that it was transported and distributed into the concrete and surrounding soils.
The leaks were 'repaired' in part by placement of the liner. Historical test records indicate that water in-leakage reached 200 gallons per day and ranged from 2 to 35 gallons per hour (depending on tide levels) due to an earthquake in the mid 1960s after the liner had been installed. The water level in the liner gap (region between the steel liner and concrete wall), the pool water level and the surrounding concrete PAGE IA-17
HUMBOLDTBAY POWER PLANT Pacific GaS.and S- .aJUNE DECOMMISSIONING CAPSTONE DOCUMENT 2012 and soil is managed so that water flow is into the facility (and not into the environment). The average monthly water in flow has generally been less than 2 gallons per day since 1990. The Liner Gap (submersible) Pump positioned in half of the Cask Pit Sump requires protection to ensure that the water flow is in versus out into the environs of the spent fuel pool.
The Fuel Pool steel liner extends from the plus twelve (+12) foot, six (6) inch elevation to the minus twenty-four (-24) foot elevation. The Fuel Pool is twenty-six (26) feet by twenty (20) feet with a deeper cask pit that extends from the minus fourteen (-14) foot elevation to the minus twenty-four (-24) foot elevation and is ten (10) foot by twelve (12) foot, six (6) inches. The liner is made of ten (10)-gauge sheet steel with welded cove corners. The floor is one/quarter (1/4) inch plate. The liner has fixed and removable surface contamination. The concrete walls behind the liner are also contaminated. The liner was added due to seismic induced cracks in the concrete and, therefore, water intrusion shall be addressed. The integrity of the liner is also questionable and may have allowed water to leak into the annular space between the concrete wall and the backside of the liner.
The scope includes scabbling of three thousand, four hundred fifty-nine (3,459) square feet of concrete walls and fifty (50) feet of cracks. Seventy (70) percent of the walls will be scabbled nominally to a one/quarter (1/4) inch depth and thirty (30) percent will be scabbled to a one/half (1/2) inch depth. The planned fifty (50) feet of cracks will be "chased" to a depth of one (1) inch.
The liner shall be removed in segments sized to fit into the disposal bins (seven [7] feet by seventeen
[17] feet) or removed and downsized to fit in the bins. Removal methods include using a rod mill to cut liner free from the fixed welded connections, using a remotely operated mechanical tool, use of nibblers or perhaps reciprocating saws.
Subgrade Structural Demolition -General 02 61 00.01--Subgrade structures includes the Work involved in removal of hazardous, nonhazardous, and radiological Contaminated Materials, which include paving, concrete slabs, subgrade structures, embedded pipe, soils, and debris. Contaminated subgrade structures and soil remediation will be a challenge around the site in areas that are not well characterized. Past spills and leaks are documented in PG&E document HBAP D-500 "Documenting Site radioactive Contamination." The Contractor's Work plans shall include a description on how the Contractor will minimize the generation of wastes. Removal of subgrade structures and contaminated soils includes the following:
- Units 1 & 2 slabs and subgrade structures
- Condensate Pump Pit and four (4) Casings
- Oily Waste (sumps, pits, pipe trenches)
" Unit 3 Turbine Building slabs and subgrade structure and removal of the Condensate Pump Pit and two (2) Pit Casings
" Liquid RadWaste Handling Building slabs and subgrade structures. A portion of the Liquid RadWaste Building will be removed and the retaining wall and footing will be used to retain the north hillside during slurry wall installation.
" Sump and trenches
- Hot Machine Shop slab and subgrade structures and the pit casing
- Recombiner SAS Building and sump. The SAS has a deep basement with an access shaft to the Offgas tunnel. These subgrade areas will need protection during slurry wall installation.
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HUMBOLDT BAY POWERPLANT Pacific
.ElectricGas ando Pac~c Ga addDECOMMISSIONING oso,. ASG 00 N CAPSTONE DOCUMENT Comp.anf*2, 2012 Se~ic. CopanyJUNE
- High Level Storage Vault
- North and South Yard Drainage Stormwater drain system
- Underground Radwaste and utility piping
- Off Gas Tunnel
- Circulation cooling water intake and discharge water piping up to the canals
- Firewater protection pipe on the north and east side of Unit 3
- Another area of concern to PG&E is protecting the remainder of the Liquid RadWaste Building after structural demolition work is complete. The interior walls and the exterior wing walls are actually part of the earth retaining structure that is the LRW Building's north wall. The Contractor will need to perform a structural analysis to ensure they leave enough support to hold the earth back, or to provide a method for demolishing the entire thing or otherwise supporting the hillside while allowing for the slurry wall equipment to pass through.
All contaminated buried and embedded piping within the RCA boundary shall be removed. There are below grade embedded piping between the Offgas tunnel and the Turbine building and the Offgas tunnel and the refueling building that require removal by the Contractor. Some piping is highly contaminated, air gapped and grouted by PG&E. The Contractor shall remove the piping under radiological controls approved by RP. The Contractor shall excavate or remove subgrade areas based on the fifteen (15) mrem/year case as the base case, which equates to approximately 537,138 ft 3 waste volume. A percentage of the excavated soil will be clean and once monitored and surveyed by PG&E, the Contractor shall stage or stockpile the clean material for reuse onsite as fill material. Contaminated soil and debris shall be loaded into waste containers by the Contractor and disposed offsite by PG&E.
Cs-137 and Co-60 are the primary nuclides of concern for Site soils. These easy-to-detect (ETD) radionuclides are presumed dominant in the areas demolished and removed.
The issue of tunnels, conduits, and Cold and Dark Power running across the potential "circle" of the slurry wall is also an issue requiring close coordination. Some utilities, but especially Cold and Dark Power, must be maintained while the Refueling Building is decontaminated and decommissioned, and this will likely require Cold and Dark Power relocation during slurry wall installation.
Sub-grade Structural Demolition - Spent Fuel Pool 02 61 00.02-The scope of this task is to remove the Spent Fuel Pool concrete walls and contaminated soil around the pool cell. The Refueling Building to the plus twelve (+12) foot elevation per Section 02.41.16.02, "Refueling Building Demolition" will be demolished by others. Access Control will be modified by PG&E to minimize impacts due to the deep excavation per other specifications. The Spent Fuel Pool and the contaminated soil and concrete are to be removed to a depth of approximately thirty-five (35) feet. The Spent Fuel Pool shall be excavated to a depth at elevation minus twenty-five (-25) feet. The Spent Fuel Pool excavation is to be filled or backfilled and returned to the nine (9) foot elevation per Section 1.23.23.01, "Fill and Backfill."
The Fuel Pool steel extends from the plus twelve (+12) foot, six (6) inch elevation to the minus twenty-four (-24) foot elevation. The Fuel Pool is twenty-six (26) feet by twenty (20) feet with a deeper cask pit that extends from the minus fourteen (-14) foot elevation to the minus twenty-four (-24) foot elevation and is ten (10) foot by twelve (12) foot, six (6) inches. The walls enclosing the Spent Fuel Pool are two (2) foot, six (6) inches to three (3) foot thick with rebar (see drawings for specific rebar configuration). The floors are one (1) foot thick concrete on a six (6) inch gravel base over a three (3) foot (minimum) tremie seal. The walls are set over sheet pilings.
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HUMBOLDT BAY POWER PLANT Elcc Gas SPacific Compaand DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 The north wall of the Fuel Pool, which traverses above the Refueling Building Subgrade Caisson, will be removed by PG&E to the plus nine (+9) foot elevation to support Fill and Backfill.
After the north yard is excavated down to the zero (0) elevation to remove the Off Gas Tunnel and buried piping (see "Subgrade Structures" section 02 61 00.01), the Spent Fuel Pool shall be removed.
The Contractor shall construct a containment tent or ventilated negative air pressure enclosure around the Spent Fuel Pool and remove the contaminated concrete structure and surrounding contaminated soil. Contractor shall assume concrete pool and contaminated soil removal will be made in a HEPA ventilated containment tent constructed by the Contractor, and personnel potentially exposed to contamination shall be wearing full face powered air purifying respirators (PAPRs). HEPA ventilated containment, if required, shall be coordinated with and approved by PG&E prior to use. The Spent Fuel Pool liner and coating between the liner and concrete wall is removed and internal surfaces decontaminated by others.
In addition to the water management issues discussed it is expected that the concrete can be wire sawed into pieces and lifted out or broken with hydraulic impact hammers. The outer walls have soil against them that require stabilization or removal to prevent it from falling into the work area. The use of an excavator with impact hammer with sufficient reach could be used to break up the concrete and with other attachments such as a bucket for loading waste or shears to cut reinforcing steel may be proposed. It is anticipated that misting sprays would be used to manage dust generated during demolition efforts.
Slurry Wall Construction 31 56 00-This Scope of Work will include installation of a slurry bentonite wall down to the Unit F clay layer that will encompass the Reactor Building Caisson and other deep structures in the Unit 3 area to provide groundwater control and isolation. The contractor will provide design of a slurry wall and dewatering system (described elsewhere) to provide ground water control.
The contractor will be required to design the thickness, mix design, and installation criteria for slurry wall construction. A number of underground obstructions will need to be removed by the contractor prior slurry wall installation, including abandoned utilities and utility chases, some of which are contaminated and must be managed accordingly.
Installation of the slurry wall will require installation of several geotechnical borings to verify the top of the so-called "Unit F," which is a thick clay layer at about EI.-170' that separates the upper and lower groundwater aquifers at the Site. This is necessary to ensure that the slurry wall is designed to "lock" into the impermeable clay, allowing for groundwater control during subgrade work within the slurry wall.
Subgrade Structural Demolition - Reactor Caisson 02 61 00.03-This potentialScope of Work includes removal of the Reactor Caisson and Deep Foundations, including subgrade sheet piling and timber pilings beneath Units 2 and 3. PG&E will have decontaminated the Reactor Caisson as part of the Nuclear Facilities Decommissioning task. PG&E has commissioned a study to evaluate a potential option to remove the concrete caisson. This task would occur immediately before Final Site Restoration and would involve significant subgrade work (to EI.-66) that may be conducted by the same Contractor conducting the Nuclear Decommissioning task.
Upon slurry wall completion, the Contractor will install dewatering wells or well points will allow for the removal of groundwater to a level beneath the Spent Fuel Pool and, later, the Reactor Caisson itself.
Once in place, the dewatering system must be maintained continuously to keep groundwater levels below the elevation of any active excavations that are part of the Nuclear Decommissioning subgrade demolition tasks.
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HUMBOLDT BAY POWER PLANT PaifiCGas,mid oDECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Removal of the caisson will require installation of several geotechnical borings to verify the top of the so-called "Unit F," which is a thick clay layer at about EI.-170 that separates the upper and lower groundwater aquifers at the Site. This is necessary to ensure that the slurry wall is designed to "lock" into the impermeable clay, allowing for groundwater control during subgrade work within the slurry wall. Upon slurry wall completion, the Contractor will install dewatering wells or well points will allow for the removal of groundwater to a level beneath the Spent Fuel Pool and, later, the Reactor Caisson itself. Once in place, the dewatering system must be maintained continuously to keep groundwater levels below the elevation of any active excavations that are part of the Nuclear Decommissioning subgrade demolition tasks.
Removal of the central portion of the Reactor Caisson will be conducted upon installation of sheet or other piling to act as ground support from the bottom of the Spent Fuel Pool, to the bottom of the Caisson. Ring beams installed around the circular piling system will provide structural stability as the excavation proceeds to depth, with the caisson being removed as the site is excavated, in a top-down manner.
Upon removal of the Reactor Caisson, the resulting excavation will be backfilled to the surface, and all removable ground support structures will be removed as part of the project.
Dewatering 31 23 19-This potential Scope of Work includes design, installation, operation of a dewatering system, as well as monitoring of ground water levels to allow for excavation and removal of various facilities such that water levels will be below foundation excavation levels, including excavations for Units 2 and 3, SAS building, and the Offgas Tunnels, and various utilities.
The dewatering system will need to be designed around the needs of slurry wall installation, excavation of below grade foundations, and in some cases discharge lines re-routed during construction to allow for specific phases of work. Monitoring wells will need to be installed to provide for real time knowledge of water levels in comparison with planned excavations on site. The dewatering system will need to meet the discharge volumes noted elsewhere in the specifications.
Challenges, Approach for Resolution, and Basis for Decision The Nuclear Facilities Demolition and Excavations project presents a number of unique challenges and obstacles that must be clearly understood and managed. The Bidder will be expected to understand each of these challenges/obstacles thoroughly, recognize when they may be relevant, and identify and implement constructive workarounds that will mitigate potential impacts.
Personnel access to the below grade areas of the reactor caisson (suppression cells, drywell, access shaft, etc.), is restricted (confined space and radiation area) and requires detailed planning to ensure optimal time on tools. Additionally, the number of personnel working below El. -14 in the RFB must be minimized due to space restrictions and limited egress / ingress. Contractor shall provide a plan for PG&E's approval that reflects the number of personnel planned to be below El. -14 and methods to optimize productivity.
Underground utilities that have not been appropriately documented may be encountered during installation of a support of the excavation work activities (e.g., slurry wall or piling) or during open-cut excavation. Original plant design drawings of underground utilities and commodities are available, but the installed configuration may not match the design drawings. Systems may have been added or altered without corresponding as-built documentation. Obstructions should be anticipated and contingency plans should be developed for unexpected obstructions in the excavations. The Contractor is responsible for sub-grade investigation, identification, and mapping of obstructions to an excavation.
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HUMBOLDT BAY POWER PLANT
' .PacificJUNE DECOMMISSIONING CAPSTONE DOCUMENT 201G
.Elect Company Excavations deeper than (+) eight (8)-foot elevation (approximately four (4) feet below grade) will require water control. Numerous excavations will be deeper than four (4) feet and the Contractor will be responsible for collecting the water and pumping it into holding tanks provided by PG&E. Due to the depth of these excavations, shoring may be required to prevent water intrusion and for stabilization of the trench walls.
Excavation spoils have to be sampled for radioactive and hazardous constituents before disposition for reuse or offsite disposal. Spoils shall be stockpiled until sample results are received, generally a fourteen (14)-day turnaround. Spoils piles shall be maintained and managed to prevent water runoff and potential cross-contamination. Due to the small footprint of the site, there is limited space for stock piling soils. PG&E's ability to ship soils will also be a factor. Soil stockpiles may accumulate faster than PG&E can package and ship the soils offsite. An integrated plan for soil stockpile management and transportation on and offsite are key to optimal use of resources.
From the investigative work completed to date, it appears a slurry wall to approximately one hundred and seventy (170) feet below grade to the Unit F clay layer will be necessary in order to manage groundwater for the removal of the concrete Spent Fuel'Pool and/or the Reactor Caisson. An early installation of the slurry wall is planned, to mitigate groundwater in-leakage during the removal of the Spent Fuel Pool liner in 2014. Early installation of the slurry wall and associated dewatering systems will allow for surgical removal of the contaminated portions of the Spent Fuel Pool concrete structures, and depending on the geometry of the slurry wall construction, removal of the Unit 3 Turbine Building foundation, equipment and floor drains in a dry environment, as opposed to having to provide large scale open excavation groundwater control. In addition, early installation of the slurry wall will allow for "in the dry" removal of the pipe tunnel from the Liquid RadWaste Building to Unit 3 Refueling Building and RP Instrument Building.
This will provide better control of contaminated materials being removed from below grade.
The climate of the greater Humboldt Bay region, including Eureka and the immediate coastal strip where the project site is located, is characterized as Mediterranean. Summers have little or no rainfall and low overcast skies and fog are frequently observed. Winters are wet, with frequent passage of Pacific storms, and temperatures are mild.
During the rainy season, generally October through April, Eureka receives about 75 percent of its average annual rainfall, with greatest monthly totals in December and January. The average annual rainfall over the 110-year period at Eureka is 38.87 inches.
The rainy season will affect the Contractor's ability to load waste into shipping containers. A covered waste management facility will be constructed and available for packaging and shipping demolition debris and soils. However, the size of the facility, the area available for staging empty and filled intermodals, and the ability for PG&E to ship intermodals during the rainy season may affect the rate at which the structures can be demolished. Close coordination between the Contractor and PG&E is required to ensure waste loading and shipment offsite is integrated to minimize impacts to scheduled activities. The rate at which the Contractor can load waste container will exceed PG&E's ability to ship waste offsite. This schedule constraint must be acknowledged by the Contractor.
Contractor Requirements The Contractor selected for this work requires significant experience in deep excavation as well as heavy construction and demolition projects, along with the expertise required to provide dewatering planning design and execution. Due to the proximity of Humboldt Bay to the north and an operating power plant to the south, as well as being located in an active seismic zone, the selected Contractor must demonstrate experience with similar projects to ensure success.
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HUMBOLDT BAY POWER PLANT Pac~ifi Gasand DECOMMISSIONING CAPSTONE DOCUMENT Electdc Cempany" ,eieJUNE 2012 Selecting one Contractor for all the in-ground work near the Reactor Caisson will minimize project risk by placing responsibility on one contractor to account for and address interaction of the slurry wall, other ground support systems, monitoring wells, and dewatering system within the work area, as well as active demolition within the slurry wall footprint as part of the Nuclear Decommissioning task. Other risk mitigation resulting from selection of one Contractor includes reduced liability for unanticipated groundwater conditions, ground subsidence, slurry wall permeability, and the possibility of having one Contractor's operations interfering with-and possibly damaging-another Contractor's work. The small project footprint not only makes coordination amongst multiple contractors difficult, but also raises risk to the project in the event of damage to the dewatering systems or ground support structures. This is especially important considering the risks involved in deep excavation in the area surrounding the Reactor Caisson and Spent Fuel Pool.
For these reasons, from a sequencing perspective, PG&E believes that installing the slurry wall and groundwater control systems concurrent with the Nuclear Decommissioning task will allow for the least-risk approach to completion and will provide several benefits in terms of scheduling.
Contracting Strategy As previously discussed, PG&E has assigned a very qualified team to develop the bid specifications for this major scope of work. This team has performed extensive research, reviewed historical data, undertaken numerous technical reviews and studies, performed field sampling and characterization in an effort to produce bid specifications and other work scope documents that will specify, guide, aid and assist the selected contractor to safely and efficiently perform all aspects of the work. Based on having clear and concise work scope documents, PG&E intends to accomplish this scope of work under a firm fixed-price contract that includes provisions to share risk for aspects of the work that may include unforeseen or other conditions that may not be fully known at time of contract award. PG&E fully understands the value of forming a strong alliance and teaming relationship with the contractor for a scope of work with this magnitude and diversity, and therefore will take every reasonable measure to ensure that risk is identified and appropriately shared by PG&E and the Contractor through the procurement process.
Section A.4 Office Facility Demobilization
Background
Demolition and restoration of the HBPP site will involve a major change in site operations and facilities.
The HBPP site consisting of one hundred forty-two and nine/tenths (142.9) acres of land contains numerous leased and owned buildings, trailers and structures used for office space, personnel access and equipment storage. All structures will be removed to three (3) feet below grade and be turned over for Final Site restoration.
Summary Scope of Work The Scope of Work includes removal and or demolition of office facilities, including buildings and structures owned and leased by PG&E. Most of buildings and structures to be removed are modular or trailer type construction. Leased trailers and structures are to be isolated, disconnected, removed from HBPP, and returned to the owner. Buildings and structures owned by PG&E are to be isolated, disconnected, demolished, and disposed as waste, unless released for salvage or recycle. (Note: Assets will be dispositioned by Lessor or PG&E Investment Recovery prior to removal from the site under this specification). An estimated thirty-two (32) building units having approximately forty thousand (40,000) square feet are included in this Scope of Work.
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HUMBOLDT BAY POWERPLANT Pacffc Ga andDECOMMISSIONING CAPSTONE DOCUMENT 2012 JUNE PG&E anticipates that the Scope of Work will be accomplished in three phases. Phase I will include the New Generation Area and is anticipated to be available mid-2014, Phase II includes the balance of the Scope of Work, except Buildings 13A and B, and is anticipated to be available late-2015, and Phase Ill, which includes Buildings 13A and B, will be available mid-2016.
Some buildings and structures are owned by PG&E and some are leased. The buildings and facilities included for removal are the Administrative Area Buildings 7, 8, 9,10A, temporary warehouse tent, sea vans, Gate B entrance and components, and walking bridge; New Generation Area Trailers 22, 24A-F, 24J, Load Center 50, concrete containment area, utilities, sub panels, handicap ramps, parking, and concrete walks; Decommissioning Support Area Trailers 12-1 through 12-7, Trailer 25, sea vans, Building 26, exercise area, Load Center 24, Peg Area, stairs, hazardous waste storage, and fuel pipe stanchion; Count Room Area Trailers 13A and 13B, guard shack, and temporary transformer power shed; and miscellaneous Area including sea vans, sewage lift station, RUBB Tent, Access Control Building 35, and Buildings 19, 20, and 32.
The Scope of Work will include removal of sewer and water lines, and other buried utilities serving the structure excavated and removed to a depth of three (3) feet below grade; removal of all unattached internal furnishings; removal of all decks, stairs, steps, ramps, railings, piers, and wing walls; removal of concrete walkways and landings; removal of pressure treated wood timbers; and removal of fencing and fence posts to a depth of three (3) feet.
Challenges, Approach for Resolution, and Basis for Decision Sequencing of Work and close coordination with demobilization of buildings and structures becomes critical to meeting scheduled commitments. Personnel relocation and asset recovery need to be completed prior to demolition of buildings. Current staffing levels at approximately 350 persons will fluctuate during the Demolition Project with staffing at a minimum level in five (5) years. Demolition and relocation of structures will need to be closely coordinated with PG&E as staffing levels change. PG&E anticipates that completion of the following Project Milestones will serve as major staff reduction points:
Nuclear Decontamination Substantially Complete / Phase I Demobilization Available Occupancy 170 Slurry Wall Installed Potential Staff Reduction:
Trailers and Structures at Trailer City and the New 350 to 175 Generation Area can be removed SFP Liner Removal, Concrete Decontamination and Phase II Demobilization Available Occupancy 80 Survey Complete Potential Staff Reduction:
Trailers and Structures on the North Hill and the 175 to 65 RCA support trailers can be removed.
Site Restoration Complete Phase HI Demobilization Available Occupancy 100 Remaining trailers around the Count Room and the All Remaining Personnel Portal Monitor and Weight scale can be removed. Demobilized Asset recovery must be coordinated with PG&E and the leasing company. Most Information Technology (IT)equipment (computers, phones, WIFI, satellite) will be demolished and removed. Some sewer systems, utilities, monitoring wells, infrastructure, and IT equipment for the ISFSI and HBGS must be preserved and protected. Available drawing will be provided to the Contractor but the Contractor shall be responsible for verifying configuration control prior to terminating utilities and infrastructure and documenting the "as left" condition. The Contractor shall have experience working in a complex and congested site to ensure critical utilities to be preserved are not interrupted.
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HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Company.
Some Buildings and structures are owned by PG&E and some are leased. The Contractor shall coordinate with both parties to ensure all Contract conditions are met, asset recovery is complete, prior to removal of demolition. Mobilization and demobilization of equipment and personnel at HBPP is critical to successful Work at the site.
Contractor Requirements The Contractor shall furnish materials, equipment, labor, and supervision necessary to perform utility isolation and removal and demobilization and/or demolition of buildings and structures. PG&E will provide limited temporary power and the Contractor shall provide all supplemental portable power. To support PG&E Contractor selection for this Work, PG&E is requiring the Contractor to demonstrate the safe performance of similar Work at nuclear or other industrial facilities where demolition or demobilization of structures and buildings in a complex and congested environment is required.
Additionally, the Contractor must demonstrate a history of successful demolition and demobilization projects involving coordination among multiple stakeholders and interaction with oversight groups and engineering controls. The Contractor shall also possess demonstrated experience in movement and transportation of salvageable and non-salvageable modular buildings and structures over public roads and highways with no impact to the environment and the general public. This shall include knowledge and use of all permits, notifications, signage, warnings, etc. required by City, County, State, and Federal regulations to travel and transport to and from the HBPP Site.
Contracting Strategy The end state for this Scope of Work is all identified Buildings and Structures identified in Table A-2 have been demolished or removed from the HBPP site, and the site is stabilized and turned over for Final Site Restoration. The Contractor shall propose a strategy that meets schedule commitments in construction environment with changing conditions. Removal of structures shall be coordinated with PG&E when the structure is no longer needed and removed from the site in a manner that does not affect other demolition activities. PG&E anticipates that a local contractor that has a proven record of being a self-starter requiring little oversight will be best suited for this scope of work. A reputation for responsiveness and knowledge of local and state requirements will be key factors considered in selecting the contractor for this scope of work. Successful completion of Office Facility Demobilization will represent a final exit Milestone for HBPP Decommissioning, and therefore, PG&E intends to screen and select the successful bidder for this scope of work with the same rigor and diligence as that which is used to make all other contractor selections.
Section A.5Final Site Restoration
Background
The goal of the final site restoration work is to prepare areas of the site for continued use by PG&E operations, including ISFSI security, transmission, and the Humboldt Bay Generating Station (HBGS).
Additionally, to compensate for natural resource impacts from the original construction of the HBGS and completion of decommissioning, PG&E is committed to restore specific areas of the site to pre-construction conditions. The final restoration plans for the decommissioned HBPP site will require approval by the California Coastal Commission.
The HBPP restoration site is contained on a parcel covering approximately one hundred and two (102) acres. There are several Coastal Development Permits that establish conditions or require approval of plans for the final restoration of the site. Additionally, certain conditions of the CEC decision on the HBGS Application for Certification establish conditions for final restoration of the HBPP property.
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HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT
,ElectrcCompany PG&E has previously reviewed and compiled information from various CDP permits and the HBGS license relevant to final site restoration conditions. PG&E has additionally completed an evaluation of alternatives for restoring the Intake and Discharge Canals. The scope of work for the final site restoration considers this previous work and relies on assumptions that the restoration plans will be deemed by regulatory agencies to satisfy previous restoration commitments. Ultimately, the final site configuration will require agency approval.
To summarize the areas subject to restoration, areas are delineated as restricted end-use (REU) areas and semi-restricted end-use (SREU) areas (see Conceptual Site Restoration Plan). REUs are more prescriptive in nature and specifically detail the restoration requirements, such as the end state conditions (e.g., wetlands), vegetation requirements (e.g., native ground cover, trees, wetlands species),
and deed restrictions that set aside areas for specific use (e.g., trails, wetlands preserve). SREUs are less restrictive than REUs and provide some flexibility for restoring these areas by allowing PG&E to propose specific mitigation measures to the permitting agencies and then, if necessary, negotiating with them to develop an acceptable plan. However, in either case, proposed restoration or development of these areas requires approval of the permitting agency.
Although much of the site will be restored to a natural state (e.g. coastal wetlands/vegetation), there will be ongoing PG&E operating areas for continued management of the Independent Spent Fuel Storage Installation (ISFSI) facilities, HBGS and electric/gas operations. Site Services has expressed interest in the environmental count room area; HBGS has requested the footprint previously occupied by Units 1, 2, and 3; and the Transmission division would like access to the LFO area, Assembly Building parking lot, and Buildings 5 and 6.
Summary Scope of Work The final site restoration includes the following general activities: demolition, asbestos removal, backfilling, final grading, storm drain installation, road construction and repairs, topsoil placement, ground cover establishment, fencing, lighting, and surfacing of areas for future PG&E use. The following paragraphs describe these general areas according to specific permit areas as shown on the Conceptual Site Restoration Plan.
" Area A - Public Access Shoreline Trail: All work has been completed to construct the trail and record a deed restriction.
" Areas B and G - Office and Laydown Area East of Discharge Canal: Work in this area includes removal of asbestos containing materials subsequent soil remediation from an area near trailer 22.
Two existing settling basins will be exposed and demolished, existing drainage piping and appurtenances removed, soil remediation completed, and backfill material placed. The entire area will have the existing surfacing and fill materials removed to the approximate original grades. There were approximately 3,600 cubic yards of fill material placed to construct this laydown area. This area will require finish grading and establishment of vegetation to create freshwater wetlands consistent with coastal commission regulatory definition for coastal wetlands.
- Areas C and D - Restoration work in this area consists of removing the existing portal monitors and their foundation and removing the existing truck scales and foundations. This equipment will be stockpiled onsite by the contractor at a location specified by PG&E. Removal of underground conduits for electrical power and telecommunications lines are included as well as removal of the oily-water separator and drain line coming into it from the truck scale basin. These areas will receive backfill and be surfaced or revegetated to match the surrounding areas.
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HUMBOLDT BAY POWERPLANT Pacffc Gasand-DECOMMISSIONING CAPSTONE DOCUMENT
.Electuic ComaEy
- Area E - Office Areas and RCA Access: Work in this area will consist of removing all surfacing materials and finish grading to establish drainage and then revegetating the areas.
- Area F - Bay View Road / NE Truck Turn-Around: Bay View Road is to remain in place to provide access to the ISFSI. The portal monitors, their foundations, and associated electrical and telecommunications conduits will be removed. Asphalt and base rock surfacing in the NE Truck Turn-Around area is to be removed. There is an existing fill area at the NE corner of the turn-around that will be excavated and returned to approximate original contours. The volume of fill material to be excavated is about 2,600 cubic yards. This excavation will involve removal of an existing drainage inlet and piping and backfill of the resulting trench. All these areas are to be finish graded to establish drainage toward existing storm drain systems. These areas will be seeded to stabilize them.
- Area H - Buhne Point Wetland Preserve: The majority of the restoration work has been completed.
What remains is to return the southern half of the existing parking lot to wetlands. This will require removing the existing base rock surface, finish grading to drain towards the south into the existing wetlands, and establish wetlands vegetation. The north half of the existing parking lot is to be graded to drain north into the existing swale and surfaced with a 4-inch layer of compacted base rock. This portion of the parking lot is to remain for public use to access the shoreline trail, provide parking for tsunami evacuation, school bus parking, and overflow parking for the King Salmon residents.
- Area I - Walking Trail into HBPP / Alpha Road / Parking South of Intake Canal: The walking trail from the parking lot in Area H, above, to the Assembly Building parking lot will have the existing gravel surface and retaining boards removed. All signs marking the trail will also be removed. The area will be graded to blend into the adjacent contours and seeded. This area will be re-vegetated with plant species consistent with those typical in the coastal Eureka/Humboldt area. Wetlands vegetation species are not required in this area. Alpha Road and the parking lot south of the intake canal will have the existing surface removed, will be graded to match surrounding contours and drain toward the south, and be seeded. There is an area identified as REST-i that will be revegetated with wetlands species once the surfacing material is removed and grading completed.
- Area J - Landscape Buffer along Public Access Shoreline Trail: These areas will have existing surface materials removed and be graded (see Areas F and G) prior to being revegetated with native plant species to create a buffer zone between the shoreline trail and PG&E property.
- Intake Canal: Final configuration of the intake canal will include areas of open water, mud flats, northern coastal salt marsh, high elevation northern coastal salt marsh, and upland habitat. Final elevations for these individual areas have yet to be established. As a result, the conceptual plan provides for filling the canal at a constant slope from the King Salmon Avenue Bridge to approximately the +12 elevation at the current location of the intake structure. Upon removal of the Alpha Road (see Area I), a portion of the former road area will be contoured to provide additional salt marsh area. In addition, excavation will be done to connect the open water area of the canal to the existing salt marsh area south of the canal. Each area will be revegetated according to the plant species typical of these areas. Design will incorporate features that will minimize siltation back into the Fisherman's Channel.
- Discharge Canal: Configuration of the discharge canal will include areas of open water, mud flats, northern coastal salt marsh, and upland habitat. Final elevations for these individual areas have yet to be established. As a result, the conceptual plan provides for filling the canal at a constant slope from about the current outfall location to approximately the +12 elevation at the current location of the circulation water pipe discharge structure. Each area will be revegetated with plant species PAGE IA-27
HUMBOLDT BAYPOWERPLANT
-. Pacific Gas andJUE21 DECOMMISSIONING CAPSTONE DOCUMENT
,JUNE 2012 Ele;ctri Cmpanf~
consistent with coastal wetlands in the Eureka/Humboldt region. There are areas onsite considered to be unrestricted use areas, with no pre-existing permit restoration requirements from regulatory agencies. These areas include the LFO area, Assembly Building parking lot, area previously occupied by Units 1, 2, and 3, area along the slope from approximate elevation +12 to about +30. These areas will continue to be used for utility purposes into the future. Final site restoration for these locations include the following:
LFO / Assembly Building Parking Lot Areas: This area is currently set aside for use by the Transmission division for equipment and material storage. The Assembly Building will be demolished which includes removal of asbestos containing materials, building demolition, foundation demolition, removal of water and sewer lines, soil remediation, backfill, and surfacing the area with base rock. The LFO area will be finish graded at an approximate slope of about 4 percent from the south end of the area up towards the existing Count Room Road. Drainage of this area will generally be directed to the south. An access road will be constructed from the Assembly building parking lot to the LFO area with the same base rock surfacing. The access road will include a storm drain to allow water to flow south towards the existing wetlands area. The final surface for this area will be 4 inches of compacted base rock.
Units 1, 2, and 3 Areas: This area is currently set aside for use by the HBGS facility. The Units 1, 2, and 3 area will be finish graded to drain towards the south and surfaced with a 4 inch layer of compacted base rock. The area encompassing the slope north of the Units 1, 2, and 3 will be finish graded and contoured. The slope area will be seeded to stabilize against erosion.
- Count Room: Site services will occupy this area. Work in this area is completed as part of Areas and D above.
Miscellaneous areas of the site restoration project include the following:
- 60kV Switchyard: This facility will be constructed east of the existing intake structure. All work for this project will be complete prior to beginning site restoration.
- HBGS Warehouse: This facility will be located in the old MEPPs yard. Work for this facility will be coordinated by the HBGS group and is not included in the site restoration project. Access to this warehouse is by Bravo and Decom roads into the main entrance of HBGS, then through the HBGS site to the warehouse.
- Storm Drain System: PG&E needs to develop a comprehensive post-construction stormwater management program for the post-decommissioned HBPP site to address the Regional Water Quality Control Board, CCC, and USACE's emphasis on low impact development, water conservation, water retention, and other measures to protect water quality. The Regional Water Quality Control Board has required PG&E to include a strategy to keep all stormwater runoff onsite and maximize water quality protection. To facilitate this requirement, the intent of the site restoration is to grade most of the site to surface drain towards the south to be collected in a new storm drain system (which may include drainage inlets, piping, swales, etc.) which conveys the water to the restored freshwater wetlands east of the discharge canal.
- Roads to Remain: Access roads for this site to remain include Bravo, Decom, RCA Way, Bay View Drive, Count Room, Donbass, and Charlie. Existing roads to remain that primarily serve HBGS area to be repaired and re-paved. These roads include Bravo and Decom. Roads serving the ISFSI area shall be repaired to match the existing structural section and surfacing as the original road. These roads include RCA Way and Bay View Drive. The remaining roads on site shall be spot repaired and receive an asphalt overlay. These roads include Donbass and Count Room.
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HUMBOLDT BAYPOWER PLANT
- DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 The Site condition that should be expected upon commencement of this Scope of Work is that the majority of demolition and earthmoving activities to decontaminate and remediate the site have been completed and that only minor structures (such as settling basins and portal monitors) remain.
Aboveground structure demolition will be essentially complete (except for the removal of the Assembly Building, #10), most subgrade structures have been removed, excavations have been backfilled to the level of adjacent grades, intake and discharge canals have been remediated, and rough grading is complete.
Prior completion of the Nuclear Facilities Demolition and Excavations Scope of Work is designed to remove the majority of the radiological and environmental contamination from structures and soils.
Primary features of the site restoration work (including quantities of the significant) include the following activities:
- Installation of approximately twelve hundred (1,200) linear feet of new storm drain system, restoration of areas requiring approximately fourteen (14) acres of clearing and grubbing, approximately seventeen thousand (17,000) cubic yards of earthmoving and finish grading, placement of approximately fifty-seven hundred (5,700) cubic yards of topsoil, mulching and seeding, and placement of crushed aggregate and other surfacing materials
- Installation and repair of perimeter fencing and gates
" Construction and repair of thirty-four thousand (34,000) square feet of asphalt roads requiring approximately sixteen hundred (1,600) tons of asphalt
- Installation of site lighting and fencing Challenges, Approach for Resolution, and Basis for Decision The final site restoration configuration is an iterative process with the permitting agencies. To receive their approval, the final configuration will likely differ from that currently represented in this discussion.
As the Decommissioning project has progressed and greater consideration given to future utility operating requirements it has become apparent that the original end state plans required amendment.
The three most significant changes to be resolved are retention of the count room, HBGS access road, and use of base rock instead for asphalt pavement in many future operating areas. Agency consideration of the significance of these deviations from the original permit conditions will determine whether additional mitigation measures will be required to offset any long-term impacts. Originally, the permit covering the count room installation required it be removed upon completion of the HBPP decommissioning and demolition project. Because the original permit indicated no long term negative impacts associated with installing the count room, no mitigation measures have been proposed to offset keeping the count room. The CCC will most likely require some compensation to offset the area now occupied by the count room. Another primary feature to be resolved is the final configuration of the Intake and Discharge Canals. A study was prepared describing three alternatives for each canal. For the purpose of this bid proposal process, , the canal alternative with the most extensive environmental features is reflected on the current restoration plans and specifications. Finally, to provide areas for future use by PG&E, it was decided to provide these areas with a base rock surfacing suitable for equipment and material storage. Although subject to compliance with SWPPP requirements, base rock, rather than asphalt pavement, was selected to provide stabilization for these areas.
Another aspect for final development of this site may include coordination with HBGS, Site Services, and Transmission departments to determine their future uses of the site. There may be opportunity to install underground services to specific areas they intend to develop, prior to completing final site restoration.
This would lessen the amount of area to be disturbed in the future.
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HUMBOLDT BAY POWER PLANT Electric And Pacific Gas.Company DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Contractor Requirements This scope of work is a major site development project involving excavation, backfill, road construction, finish grading and other aspects normally associated with completion of a large industrial facility. PG&E intends to select a contractor that has extensive experience in major high visibility site development projects. The selected contractor must have demonstrated experience in large earth moving projects involving soil remediation, extensive SWPPP management.
Contracting Strategy PG&E expects that this scope of work will be clear and well defined appropriate for firm fixed-price contracting. PG&E also realizes that a scope of work of this nature inherently involves unknowns such as unforeseen conditions, regulatory changes, and stakeholder driven changes that can affect the baseline quantities and design. Accordingly, the contract issued for this scope of work will include applicable unit rate pricing for additions and deletions in scope.
Section A.6Administrative Specifications In developing the specifications required to carry out the HBPP Civil Works projects, PG&E retained the services of two consulting firms specializing in heavy civil construction and demolition projects at nuclear, power, chemical weapons demilitarization, and other heavy industrial facilities. Gaining an understanding of the unique requirements of the types of firms that would bid upon the types of work envisioned at HBPP, PG&E developed the specifications organized in the Construction Specifications Institute (CSI)
MasterFormat TM , which is the construction industry's "gold standard" for detailed specifications.
MasterFormatTM isthe master list of titles and numbers used to organize specifications and other project information for most commercial building design and construction projects in North America. By standardizing such information, MasterFormat MT facilitates communication among architects, specifiers, contractors, and suppliers. This standardization helps the team them meet Owner requirements, timelines, and budgets by providing a commonly understood format and organization for Owner information.
As HBPP developed these administrative specifications over the past 12 months, the specification writers identified and applied standards in use throughout the industry. The purpose for this was to ensure that potential bidding contractors clearly understand the Work in a familiar context; are aware of the methods and protocols by which work is to be conducted; and can develop Work Plans, Engineering Evaluations, and other deliverables to accurately portray how work will be executed to meet PG&E requirements and expectations. During this period, the specification writers incorporated peer review comments from site-wide department level reviews at 30, 60, and 90 percent milestone completion dates.
The administrative specifications provide a commonality between the five (5) Civil Works contracts, and create the administrative link between the technical work to be conducted by the contractors, and the HBPP PG&E Owners Group that will administer the contract(s) and provide technical oversight.
Considerable effort went into developing the administrative Sections, with the major PG&E stakeholder organizations providing critical input and guidance on their requirements. Internally, HBPP stakeholders spent more than six (6) months in the latter twelve (12) month effort holding round table meetings and reviewing drafts of the specifications to ensure that important issues were identified, clarified, and resolved within the specifications.
The bid strategy developed by PG&E included development of alternatives for demolition sequencing and approach, and the Request for Proposal specifically asks the contractors bidding on each Civil Works project to identify alternate approaches to that envisioned by PG&E. The goal of the decommissioning project is to build effective teams in partnership with our contractors. We recognize we must impose PAGE IA-30
HUMBOLDT BAY POWER PLANT Pacific Gas,and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electic Compny certain constraints upon the Civil Works projects, but realize that contractors with an array of decommissioning experience may have unique approaches developed on other projects with which we are not familiar, and we are open to modifying the specifications and the Contract documents through negotiations with the selected bidder(s) to ensure the Decommissioning Project is carried out in a safe, technically achievable, and cost-conscious manner.
Section 01 11 01 "Health and Safety Requirements" Pacific Gas & Electric (PG&E) fosters a safety culture and expectation of exemplary safety performance and at PG&E's HBPP Site, Safety is our number one priority. This expectation is demonstrated by a fundamental requirement to Work Safely, Every Person, Every Task, Every Day. PG&E and HBPP are committed to fulfilling its mission of safely decommissioning and releasing the Part 50 NRC license. To meet this commitment, safety must always be foremost in the mind of each Contractor and his or her employee.
Regardless of how much PG&E emphasis is placed on safety and how many rules are instituted, the bottom line is that safety is up you. The best way to prevent accidents, injuries, and illness is to develop and maintain a constant awareness of safety and a positive attitude while implementing well planned work. Discovery or identification of safety issues and concerns, injuries, accidents, or near misses are to be immediately reported to PG&E management or designated point of contact. All personnel are given stop work authority for any activity they believe is unsafe or poses a risk to meeting regulatory requirements.
PG&E requires this safety culture be adopted and implemented by all PG&E Contractor personnel, and all sub-tier Contractor personnel in all aspects of work performance, behaviors, and personnel interactions.
This philosophy and the continued emphasis on safety, environment, and regulatory compliance shall form the foundation of all activities planned and performed at the PG&E facility.
All work activities are to be conducted safely, and work activities are to be planned with adequate detail and time to allow for the required coordination in order to work the plan as written. It is PG&E's goal that all potential safety concerns relating to work conducted at HBPP is approached from a preventive, not reactive, perspective.
During the planning phase, PG&E expects the Contractor to proactively identify potential safety challenges, and implement measures to mitigate or completely avoid these challenges. Contractor Site Safety Representative(s) must utilize human performance tools to achieve safety goals, have a daily presence in the field to observe work, maintain situational awareness, and be available for support. The Safety Supervisors will cooperate and coordinate with PG&E's Safety Staff.
All "near-hits" are to be reported, trended, and addressed to improve performance and avoid incidents and accidents. The Contractor shall self-identify incidents and adverse trends, evaluate root causes, and implement corrective actions utilizing HBPP's Problem Identification and Resolution Procedure. In a spirit of openness and cooperation, PG&E and the Contractor will cooperate and involve each other in this process, and the Contractor will use the process to supplement its own Safety Program.
The Contractor's proposal shall include adequate oversight and safety staffing to demonstrate their understanding of strategies for the effective use of resources, communication, and personnel when it comes to ensuring safety oversight and expectations from their workers. The Contractor shall have a minimum of one full time safety officer/representative at HBPP with no other responsibilities as approved by PG&E. Additional safety reviews, audits, and/or inspections shall be performed at least quarterly by Contractor's home office staff or consulting safety specialist. Quarterly reports evaluating work performance and recommendations for improvement shall be submitted to PG&E Management within thirty (30) days following the end of the quarter.
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Ei HUMBOLDT BAY POWER PLANT PacificGas and
- CopanyJUNE DECOMMISSIONING CAPSTONE DOCUMENT 2012 Electrc Companyf; Contractor shall include safety communications protocol instructions to supervisors, stressing effective communication between PG&E's Managers and Contractor's Supervisors that emphasizes the timely identification, discussion, and review of safety issues and concerns.
To ensure our values are in alignment, PG&E requires certification from Contractor's senior safety officer that Contractor understands PG&E's safety culture and is committed to meeting the safety expectations.
Section 01 31 13 "Project Coordination" HBPP is located on a very small industrial footprint, surrounded by wetlands and other sensitive environments, Humboldt Bay, and the community of King Salmon. The currently active areas of the site include decommissioning activities within the Refueling Building (including the segmentation of the reactor internals and subsequent segmentation of the reactor vessel shell); ISFSI (consisting of five (5) stored nuclear fuel casks and a Greater than Class C cask to be loaded in early 2013); a one hundred sixty-three (163)-Megawatt HBGS operating facility; and construction of several industrial buildings supporting a new 60kV switchyard upgrade and a new GWTS in 2012. Existing nuclear Unit 3 operational systems include Main Vent Plant and Stack alpha monitor, Liquid RadWaste System, Fire Water System, Radiological Monitoring, Temporary Power System, Groundwater Monitoring Well System, Yard Drainage System, Refueling Building, Administration Buildings, Communications, and other Utility Systems.
All work conducted at the job site requires significant levels of coordination amongst PG&E organizations, not to mention the myriad of contractors onsite supporting operations and decommissioning work with a varying degree of changing priorities. The magnitude of the Civil Works program cannot be understated. As HBPP transforms from a self-performing nuclear decontamination organization to a contracted work force conducting demolition and earthwork activities, the Contractor must manage a complex series of changes in human, equipment, and built environmental resources.
PG&E expects that the Contractor will form its teams prior to submitting its bids, and will work closely with its team to clearly develop an understanding of how Work will be carried out. After Contract award, PG&E expects that the Contractor Team will formalize their roles and make arrangements to participate in one or more Partnering sessions with HBPP organizations. Partnering is going to be key to project execution success, and PG&E expects the Contractor to join us as part of an integrated project delivery team.
After Contract award, PG&E expects that the Contractor Team will formalize their own roles and develop formal team-building exercises with key PG&E stakeholders. The concept of formal Construction Partnering is not new, but few projects take advantage of this type program. By bringing project stakeholders together, getting to know one another, and making one-on-one commitments to each other, Partnering builds high-performing teams that simply execute better. Successful Partnering brings the team together, builds trust, increases collaboration, and breeds a high level of success across all project metrics. PG&E wants to work with a Contractor team that not only understands this concept but embraces it.
PG&E envisions that multiple Civil Works projects will be ongoing at any given time, particularly during the Nuclear Decommissioning Contract to install a slurry wall from ground surface to one-hundred and seventy (170) feet below grade surrounding the Unit 3 nuclear structure in 2014. Multiple decommissioning activities will require close coordination, including decontamination, waste packaging and management, and heavy equipment and earthworks across the entire site. To complicate matters, until the NRC license has been terminated, Structures, Systems, and Components (SSC) deemed "important to safety" (ITS) under the Part 50 license must be protected via a mechanical ventilation envelope. Any disruptions to the PAGE IA-32
HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT Elecc Company- JUNE 2012 ventilation envelope around these SSCs (Turbine Building, Refueling Building, Liquid RadWaste Building) require temporary work shutdown within the affected structure(s), which can be complicated and time-consuming to re-engage from an engineering perspective. Removal of the Drywell, Suppression Chamber, Spent Fuel Pool Liners, and concrete surface contamination in the ventilated structures will require this ventilation to be in service, and possibly additional local ventilation and containment where required.
Because of the amount of site activity at HBPP, coordination is imperative to job success. Required daily planning represents significantly more coordination effort than the typical demolition contractor is accustomed to, particularly in the earlier stages of the project when PG&E is conducting gross decontamination on systems and components, and toward the end of the Civil Works projects as subgrade structural demolition, earthworks, and site restoration activities begin to "back out" of the site from east to west.
PG&E has in place an established control system that carefully considers all activities onsite; evaluates interfaces for potential conflicts; prioritizes access to roadways, entry points, and work areas; and ensures that Radiation Protection and other departments are able to monitor personnel and equipment effectively; and to release waste for offsite shipment. The demolition Contractor shall keep PG&E management, planning, and operations staff aware of its day-to-day requirements to prevent adverse impact to work beyond the Contractor's scope.
Overall project coordination includes detailed long term schedules and work plans, near term implementation schedules, and day-to-day coordination activities including:
" Plan of the Day meetings
- "Tailboard" meetings conducted at the beginning of each work day to address activity level planning
- Post job reviews
" Attendance at PG&E Plan-of-Next-Day (POND) meeting to assess the day's work, identify the next day's work, and coordinate with all other projects at HBPP For any work requiring excavation or soil penetration (including driving stakes or ground rods),
Contractor must obtain and comply with excavation permits; address overhead and underground electrical or communication lines; and coordinate with the FSS organization to adequately schedule the time necessary for PG&E to complete FSS work prior to placement of fill.
The Contractor will be expected to work closely with the PG&E Work Week Manager (WWM), who oversees the daily work coordination process as it relates to the work being performed during the workweek at HBPP. On the first workday of the week, the WWM will provide a schedule of the T-O through T-2 workweeks for review. This period is considered as the schedule scope freeze. All Contractor representatives will review and ensure that the week's scheduled activities are correct. The WWM coordinates emergent work, authorizes significant changes to the daily schedule inside the scope freeze, approves work additions, and provides an interface with management to address any specific problems that may arise in the assigned workweek. Any addition to the schedule will require WWM approval. This will only occur after all coordination has been arranged and approved by impacted departments.
Emergent work request during the two-week period may also require Manager's approval. This does not apply to emergency or urgent work dealing with safety, environment, security, or plant systems status.
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HUMBOLDT BAY POWER PLANT SPacific Ga
... GaS, and
.. and ' DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Elecfic Cman.~JNEZl Section 01 31 19 "Project Meetings" Supporting Project Coordination, this Section addresses the requirements for meetings, and makes available to PG&E contractual tools for sharing information, providing direction to the contractors, and addressing change via a process that identifies and mitigates change as early as possible in any given Civil Works contract. The Contractor is encouraged to engage fully in regular schedule meetings to ensure communications between Stakeholders are well understood. If necessary, meetings should also be scheduled in prompt to any issues that may affect Contractor's safety and environmental performance or any impacts to cost or schedule impacts. The Contractor is expected to exercise his or her chain of command to ensure senior level meetings are held to mitigate any undue impacts to the project.
If necessary, meetings should also be scheduled in prompt to any issues that may affect Contractor's safety and environmental performance or any impacts to cost or schedule impacts. When change is inevitable, PG&E maintains high expectations that the Contractor will be prepared to substantiate that change, using schedule or financial baseline data with clearly described and well documented impacts to the schedule or budget. The Contractor is expected to exercise his or her chain of command to ensure senior level management is engaged at the appropriate level to mitigate any undue impacts to the project.
At HBPP, PG&E has in place an established control system that carefully considers all activities on site; prioritizes access to roadways, entry points, and work areas; and ensures that Radiation Protection and other departments are able to monitor personnel, equipment, and wastes for offsite shipment effectively. The Civil Works contractors will be required to keep PG&E management, planning, and operations staff aware of day-to-day requirements to avoid adverse impact on ongoing operations beyond their scope. Detailed "tailboard" meetings are conducted at the beginning of each workday, addressing the plan-of-the-day, potential safety and performance concerns, definable features of work to be performed, waste packaging and shipping issues, environmental concerns and requirements, and lookaheads that provide "big-picture" information to the demolition work team.
At the end of each day, plant-wide POND meetings are held to assess the day's work, identify the next day's work, and coordinate with all other projects at HBPP. These meetings allow each contractor the opportunity to coordinate activities and develop long-range work planning in a manner that minimally affects other projects and PG&E organizations with operational missions.
Meetings specific to Health and Safety, Quality Control, Contractor Performance, and Change Management will be scheduled regularly and can be called by PG&E or the Contractor at any time to address specific issues that require additional attention. For each meeting, all participants should be prepared to identify and address the specific goals of the meeting. From planning through execution, stakeholders must be able to identify their concerns, known unknowns, risk to the project, and potential mitigation strategies. The work pace will be hectic, so meetings must be planned to be effective and valuable to all attendees.
After the successful completion of the Fossil Decommissioning activities in 2011, HBPP lessons-learned include the understanding that PG&E stakeholder involvement is critical for scoping, planning, daily work, and contract status meetings. The PG&E Contract Manager and Owners Group will work as a team to effectively administer the contracts and drive the scope of work to completion. A preconstruction conference will set the tone and pace of each contract. Weekly and monthly contract management meetings with each contractor will address project requirements and track contractor progress against schedule and budget, allowing PG&E to monitor progress across all contracts using the HBPP integrated schedule.
PAGE IA-34
-HUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE OCUMENT BEicc Companf JUNE Section 01 32 00 "Progress Documentation" As with any significant industrial plant project, steady progress toward the desired end state requires considerable attention to and maintenance of the project schedule. Progress made on each of the Civil Works projects will be measured against baselines provided by the contractors and vetted by PG&E (and the other contractors) against planned work on all Civil Works projects.
Within 30 days after NTP, the Contractor is required to establish an initial baseline progress schedule showing complete interdependence and sequence of construction and Project related activities reasonably required to complete the Work. Schedules shall clearly identify the work of separate stages, other logically grouped activities, and critical path of activities. The schedules shall reflect sequences of the Work, restraints, delivery window, submittal review times, contract times, and project milestones. The Contractor is required to submit regular narrative progress reports to include schedule and cost performance indices; force reports; radiological issues; identification of potential Contract changes, description of actual or potential delays; changes to activity logic or critical path, steps taken to recover the schedule from any delays, etc.
PG&E expects Contractors to team with PG&E in developing successful projects that meet corporate requirements safely and efficiently. For Civil Works projects, PG&E requires that contractor teams include highly experienced schedulers, who will work directly with and provide regular updates to the PG&E Work Week Managers, Schedulers, and Program Management Team.
To achieve consistency in the development and management of contractor schedules, this Section articulates PG&E's requirements in terms of standards developed by the Project Management Institute for management metrics, and the Associated General Contractors of America for schedule using the Critical Path Method. As each contractor develops, refines, and tracks his Civil Works project schedule, PG&E will be able to integrate it into the HBPP P6 schedule in a "plug and play" style, allowing evaluation of impacts to other onsite operations based on contractor requirements or needs, as well as in-course changes to existing plans to better accommodate overall project needs.
The Contractor shall work closely with the PG&E Work Week Manager (WWM) who oversees the daily work coordination process as it relates to the work being performed during the workweek at HBPP. On the first workday of the week, the WWM will provide a schedule of the T 0 through T-2 workweeks for review. This period is considered as the schedule scope freeze. All Contractor representatives will review and ensure that the week's scheduled activities are correct. The WWM coordinates emergent work, authorizes significant changes to the daily schedule inside the scope freeze, approves work additions, and provides an interface with management to address any specific problems that may arise in the assigned workweek. Any addition to the schedule will require WWM approval. This will only occur after all coordination has been arranged and approved by impacted departments. Emergent work request during the two-week period may also require Manager's approval. This does not apply to emergency or urgent work dealing with safety, environment, security, or plant systems status.
Section 01 33 00 "Submittal Procedures" The HBPP Decommissioning Project has learned through prior work conducted at the site that contractor submittals for project planning and execution are extremely important. Proper, complete, and appropriate documentation is necessary to record project decisions, the basis for planned activities, execution of the Work, and conformity with project plans and specifications. For the Civil Works contracts, PG&E will not accept subpar deliverables. We are requiring the contractors to certify the quality of their deliverables through their Contactor Quality Control (CQC) Manager, and we have created the appropriate tools to reject submittals that do not "meet the grade," at no cost or delay to PG&E.
PAGE IA-35
HUMBOLDT BAY POWER PLANT
,ElectricGas andJUE21 DECOMMISSIONING CAPSTONE DOCUMENT EPacific Company UN Recognizing that the submittal review process is a two (2)-way street, we have also educated our key stakeholder staff to the importance of timely reviews. We are committed to conducting initial submittal reviews within three (3) working days of delivery of all required submittals, notifying the contractor if the submittal is unacceptable. We are committed to holding early partnering meetings to achieve agreement on submittal requirements and content; conducting full review of all submittals within two (2) weeks; and working closely with the contractor(s) to resolve technical issues with the required submittals.
Upon contract award, PG&E expects the contractor to continue the planning started during the RFP phase, developing a very high-level Project Execution Plan that will communicate to PG&E and the entire contractor team the project goals, roles and responsibilities, coordination and handoff, and the personnel and management tools that will be utilized to deliver a quality product to PG&E.
At the work execution level, PG&E expects the Civil Works contractors to conduct rigorous work planning for so-called "Definable Features of Work," which are discrete work steps required to execute a task fully.
To that end, contractors will develop well thought-out Work Plans that describe these Definable Features of Work, with appropriate detail, expectations, and hold points necessary to conduct the tasks safely. The Work Plans will be submitted to the Document Control Specialist working for the Decommissioning Engineer, who will ensure that they undergo detailed review by the Owner's Group. Key reviewers and approvers within the Decommissioning organization include the Decommissioning Engineer, Demolition Specialist, Radiation Protection and RadWaste, Industrial Hygiene, Fire Marshall, Environmental Coordinator and other Environmental staff, and Special Projects personnel, including Work Planners, Schedulers, and others responsible to ensure that daily work activities at HBPP are well coordinated.
Similarly, some of the Definable Features of Work involve steps that will affect code or permit conditions and requirements. For those tasks, PG&E is requiring that the contractors develop Engineering Evaluations sealed by a California-licensed Civil or Structural Engineer. These Engineering Evaluations will document how code or permit requirements will be maintained and how the contractors intend to maintain structural stability and seismic support, ventilation control of radiologically contaminated structures, ground support, water control and management, and other changes to the site that could potentially endanger workers, the adjacent community, or the environment.
PG&E expects submittals to be reasonablystaggeredfor PG&E review and approval.PG&E is committed to providing timely reviews and quick notificationsfor submittals that cannot be accepted as submitted We are well aware of the impact that Owner-initiateddelays could potentially have on the Contractor and are committed to minimizing-if not eliminating--suchimpacts. To aid in PG&E's review, for key submittals of significance technicalchallenges or key project submittal milestones, PG&E expects a presentationby key technical Contractorpersonnelto help facilitate the review and understandingof the submittal.
Section 01 45 16 "Contractor Quality Control" Most heavy civil works contractors are familiar with the project quality requirements of the US Army Corps of Engineers. The Corps has developed a three-phase quality program that overlays any work planning process utilizing Definable Features of Work, as described above.
- Prior to conducting any task, the contractor will lead a Preparatory Phase meeting to describe the means, methods, staffing, and engineering and RP controls that will be in place to achieve each task.
This meeting will be led by the contractor's CQC Manager, and attended by the contractor's CQC team and PG&E's technical team, as appropriate to the task.
PAGE IA-36
-i aHUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT
ý,EVidc .Comppany. .JUNE 2012
" Immediately before the contractor begins working upon each Definable Feature of Work, an Initial Phase meeting will be held. This meeting will involve the CQC team and PG&E, as before, but also the Craft that will perform the work tasks, as well as PG&E's RP and RadWaste oversight staff, as appropriate.
- The Follow-Up Phase includes daily review of the Work by the CQC Manager or designee, reporting back to PG&E, and resolving any identified issues through work process modification, addition of staff or controls, or other agreed-upon means. Any changes necessitated by the Follow-Up Phase will require Work Plan modifications, and the three-phase process must begin anew for these changes.
As noted above, the CQC Manager is responsible for verifying that all plan submittals meet the requirements of the Contract documents. PG&E expects CQC Manager verification and signature on all such submittals, certifying the documents are complete, that coordination with PG&E staff has been conducted to PG&E's satisfaction, and that anticipated technical issues have been adequately characterized to PG&E during those coordination meeting (i.e., "no surprises").
Finally, because the Contractor will plan and execute Work with the potential to affect structures, systems, and components (SSC) at an NRC-licensed facility, PG&E will provide quality verification audits, assessment, inspection, and testing, and will screen all Work Plans and other planning documents, in accordance with license requirements including Title 10, Part 50 of the Code of Federal Regulations (10 CFR 50), "Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants." CQC programs will address the safety requirements of 10 CFR 50 Appendix B, Criteria 1, 2, 5, 6, 16, 17, and
- 18. In addition, PG&E management and supervisory personnel will observe the execution of the work through the recently implemented Management Observation Program and provide feedback directly to the crews and Contractor project management.
Section 01 50 00 "Temporary Facilities and Controls" The purpose of this Section is to provide the Contractor with information about regulatory community and PG&E requirements as regards permits and approvals for facilities, structures, and engineered solutions necessary to support the Civil Works Projects. Because of the dynamic nature of the Work, a variety of temporary systems will be necessary, including utilities, laydown areas and structures, and protective systems and barriers. In addition, the Civil Works contractors must develop plans addressing temporary and changing situations, particularly with respect to noise and dust control, traffic and pedestrian routing, and other field logistics as work amongst the various Civil Works contracts progresses around the site.
The requirements of this section relate strongly to PG&E's business interests, relationships, and reputation.
With HBPP and HBGS clearly visible from US-101 entering Eureka, and as one of the county's most prominent employers, maintaining the company's reputation in the local community is critical. As temporary facilities are erected to satisfy the requirements of the Civil Works project, the Contractor may be required to deal with Humboldt County and with the California Coastal Commission, both of whom regulate temporary structures that are erected at HBPP and HBGS. PG&E expects the Contractor, working with PG&E Environmental, to acquire all necessary permits for the construction of temporary facilities, follow the permit requirements precisely, and conduct itself as an agent of PG&E during permit negotiations.
With the exception of some power during the earlier portions of the Civil Works Projects, PG&E is requiring the contractors to provide utilities to meet their needs, including compressed air, water, fuel, and power in excess of the amount outlined in the Specifications for the Turbine Building and Nuclear Facilities PAGE IA-37
HUMBOLDT BAY POWERPLANT DECOMMISSIONING CAPSTONE DOCUMENT
" G addJUNE 2012 Decommissioning. By November 2010, with the exception of the Liquid Radwaste Building and other ancillary waste handling buildings in the upper yard, PG&E converted all structures within the Unit 3 footprint to "Cold and Dark Power," which is a temporary power system that the contractors can access to conduct the Work.
The contractors must closely coordinate the use of Cold and Dark Power with PG&E operations to ensure that critical power needs within the structures are met. The contractors also must be prepared to sequence out of using Cold and Dark Power, particularly during Nuclear Decommissioning, when power is cut back to the principal load centers surrounding Unit 3, as the Nuclear Facilities are air gapped.
This section also requires that the contractors coordinate their planned activities closely with PG&E and the regulatory agencies that control HBPP permits. As the landowner, PG&E holds ultimate responsibility for ensuring that construction and demolition activities on its property are compliant with all federal, state, and local requirements. To that end, the specifications provide a table that identifies which party has the primary responsibility for obtaining and maintaining various permits. The Contractor's focus will be on those permits necessary for the operation of its own temporary air pollutant sources (e.g., small engines), building permits from the local building department, and PG&E excavation permits and other Procedural approvals.
Construction and demolition operations, by their very nature, generate nuisance conditions to plant workers and the public. To minimize and help mitigate such conditions, PG&E is requiring that the contractors develop plans to control nuisance conditions from its operations, including noise, dust, utility disruptions, and traffic and pedestrian routing disruptions. PG&E will require that these plans are submitted and approved prior to starting each Definable Features of Work (DFW) that will cause the nuisance condition, and that their contents are discussed at POND meetings immediately before execution of each DFW or before any change to the proposed plan. Through close coordination, PG&E hopes to keep contractor operations out of the way of HBPP personnel conducting other ongoing activities.
Section 01 57 13 "SWPPP Compliance" One of the biggest environmental challenges at HBPP is preventing sediment from entering Buhne Slough and Humboldt Bay during heavy rainstorms. The facility is governed by discharge permits, and during demolition, additional requirements will apply to PG&E and the contractor teams working at the site. To meet permit requirements, HBPP has developed and manages its operations in accordance with a site-specific Stormwater Pollution Prevention Plan (SWPPP) and a variety of "Best Management Practices" that prevent site operations from adversely affecting receiving bodies. As the Decommissioning Project evolves, multiple contractors will be responsible for adopting and modifying the SWPPP, if appropriate to address contractor impacts to stormwater flows.
PG&E is extremely sensitive to the issue of SWPPP compliance. Local regulators routinely inspect the site, and recent contractor-caused Notices of Violation (NOV) have created a challenging regulatory environment. With its contractor team, PG&E has developed and implemented corrective actions that will go a long way toward preventing future occurrences. Throughout the bidding process, PG&E will lead an open dialogue about its concerns relative to stormwater permits and violations, and PG&E expects the Contractor to understand and proactively implement measures to protect its work from affecting receiving bodies of water.
In addition to actively partnering and interacting with the contractors from the outset of the Civil Works program, PG&E will provide lessons-learned and guidance throughout the project. The contractors must understand that they are serving PG&E stakeholders, including regulators, nearby residents, and the public at large, many of whom recreationally use the waters surrounding HBPP. To effectively manage these relationships and comply with environmental requirements, contractor SWPPP teams must be fully aware of current site conditions, weather forecasts, and lessons learned by previous and current PAGE IA-38
HUMBOLDTBAYPOWERPLANT Pacifid Gas.add ODECOMMISSIONING CAPSTONEDOCUMENT JUNE 2012 Electric Company contractors, as well as PG&E work crews. With years of experience dealing with the stormy weather of Humboldt County, there is no reason for the contractors to "learn as you go."
The contractors must all understand that the demolition and earthwork tasks will create opportunities to seek creative methods to prevent permit violations. In addition to the movement of hundreds of thousands of cubic feet of soil necessary to expose and demolish subgrade structures and utilities, as well as complete final site restoration work, the demolition will generate a significant amount of concrete debris. Concrete dust creates difficult-to-manage environmental conditions if not handled in the dry. This fine particulate matter material can impart high levels of turbidity and pH to stormwater, potentially leading to NOVs, even using typical BMPs. Part of the contracting strategy that PG&E will utilize for the Civil Works projects includes stipulated damages for any NOVs received by PG&E as a result of contractor activities.
PG&E developed the Turbine Building demolition specifications to include construction of a temporary structure within the Units 1 and 2 footprint, which will allow for most or all of the waste management work to be conducted in the dry. However, ifthe contractor manages rubble, soil and/or canal sediment outside the temporary structure, measures must be taken to keep runoff from concrete demolition rubble or high turbidity soil or sediment from being released to yard drains. During later phases of decommissioning, other management structures may be required, and PG&E will look to the contractor team(s) to support PG&E's environmental requirements in carefully managing demolition debris as well as stockpiled fill and backfill materials.
Section 01 57 19 "Supplemental Environmental Protection Requirements" In addition to the environmental requirements addressed in Sections 015713 "SWPPP Compliance" and 017401 "Waste Management," as well as some of the permitting requirements addressed in Section 015000, "Temporary Facilities and Controls," this Section provides PG&E's expectations for the myriad of other environmental and public interfaces that contractors must make.
One of the most important of these interfaces is the public. The contractor, upon entering and exiting the HBPP campus, is publicly acting as an agent of PG&E. The communities of King Salmon and Fields Landing, as well as other towns in the vicinity, pay close attention to the activities of PG&E. Therefore, it is incumbent upon the contractors to act professionally in all of their dealings with the community.
Transporting equipment into the area may require permits from the local communities and/or the California Highway Patrol, depending upon contractor needs. PG&E expects the contractors to interact with.these agencies, and the public, with courtesy and professionalism.
From a hazardous materials perspective, depending on their activities, the contractors may be required to develop addenda to various plans, including PG&E's site-specific Hazardous Materials Business Plan and Hazardous Materials Spill Response Plan. Similarly, changes to the aesthetic profile of the facility require compliance with the Coastal Development Commission permit. Finally, soil excavation and reuse requires that the contractors review and understand how doing so is bounded by the requirements of the HBPP Interim Measures Remedial Action Workplan (IMRAW). Because PG&E is frequently audited by regulatory agencies or has a required schedule for submitting periodic monitoring reports or plan updates, we have required these updates as Action Submittals, and they must be approved before PG&E can submit the required regulatory submittals to the involved agency.
Onsite resources require protection, and PG&E has on staff and on contract a team of environmental professionals, including an Environmental Coordinator who will serve as the contractors' primary environmental point of contact within the organization, and an Environmental Remediation Project PAGE IA-39
HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT Pacifc Ga andJUNE 2012 Electlv c Company Manager who will serve as the point of contact regarding issues relating to nonradiological soil remediation and soil management. Other staff include Biological Monitors, Cultural Monitors, and various Environmental Technicians who support the environmental team.
Biological resources on the HBPP campus include special, threatened, and endangered species, as well as wetlands and waterways. Impacts to avian resources, particularly during the Canals and Site Restoration tasks, must be carefully managed, especially during the breeding season (March 1 to May 31 each year). PG&E expects the contractor to observe these resources and work closely with the PG&E Biological Monitor prior to and during construction work to ensure that these resources do not nest and breed in proximity to work areas during the Decommissioning Work. PG&E has experienced several projects where the discovery of biological resources near the work area has halted work for months. We do not have the time to stop the Decommissioning Work for any reason, especially if the situation could have been prevented.
Section 01 74 01 "Waste Management" Management of demolition waste generated at a Nuclear Facility is subject to considerable monitoring for disposal. As such, the contractors selected for the various Civil Works projects will be confronted with a variety of wastes, subject to various requirements and regulations, and acceptable for disposal at one or more facilities depending upon waste constituents and condition. The small physical footprint at HBPP and PG&E's ability to process waste off site are likely to have the largest impact on the contractors' waste management operations. Similarly, waste disposal requirements at the nuclear waste disposal facilities will play a key role in waste management decisions and operations.
HBPP utilizes two disposal facilities for nuclear waste. The lower-cost option for the disposal of low-level radioactive waste (LLRW) is at the US Ecology Inc. site in Idaho. PG&E currently holds a master services agreement with US Ecology for the disposal of exempt and regulated LLRW. Higher level wastes are disposed at the Energy Solutions facility in Clive, Utah. In developing the overall disposal strategy for the decommissioning work, PG&E selected decontamination methods that serve to remove highly contaminated surface from the substrate, concentrating the contaminated material into 55-gallon drums for disposal as regulated waste. That approach leaves much of the remainder of the building materials to be disposed as exempt (i.e., non-placarded) LLRW.
Through the Work Planning process, PG&E expects the Contractor to work closely with RadWaste to develop approaches to decontamination and waste management that reduces overall project cost by concentrating radioactive waste and allowing for the disposal of larger quantities of unregulated waste at the US Ecology site.
During the Turbine Building demolition, the contractor will deliver bulk demolition debris to PG&E at a temporary Waste Management structure constructed for the purpose of managing demolition debris.
PG&E can only process 2 to 8 intermodal containers per week (average up to 12 in any one week of any month), far less than the amount of waste the Turbine Building contractor is expected to generate at the height of demolition operations. Because the disposal facilities require that waste contain no free liquids, PG&E is seeking contractor-proposed methods to manage the material in the dry, either in the temporary structure or in other facilities constructed for that purpose, or using other means that achieve the required disposal parameters.
As the program matures, PG&E expects the contractors to propose Engineering Evaluations and Work Plans that address the methods by which large quantities of waste will be generated, handed off to PG&E for packaging and management, and delivered to the waste disposal facilities under full PAGE IA-40
HUMBOLDT BAY POWER PLANT tricGags.
Pacifc Add Cmpany01 DECOMMISSIONING CAPSTONE DOCUMENT compliance with their requirements (i.e., no free liquids). Particularly during the Canals Remediation and subgrade Nuclear Decommissioning tasks, as well as at any time during the extremely wet rainy season, the Contractor will be faced with soil/sediment dewatering requirements to meet disposal criteria. Soil and sediment must be brought into a dry area for the dewatering operation to prevent precipitation from entering the waste stream. PG&E expects the Contractor to provide an approach to waste management that mitigates concerns about delivering wet soil to the disposal facilities.
PG&E will also look to the contractor to understand limitations for the management of liquid wastes, given the operation of PG&E's Groundwater Treatment System (GWTS) near the Discharge Canal.
Dewatering liquids and collected rainwater may be discharged to this system at a maximum flow rate of three hundred (300) gallons per minute and meeting certain pollutant limits. Water not meeting the influent requirements must be managed off site at considerable cost, so PG&E is looking to the contractors to develop methods to manage water legally, safely, in compliance with regulations, and at minimum cost to PG&E.
The movement of waste around the site and ultimately, to off-site disposal facilities, throughout the Demolition operations is perhaps one of the biggest challenges the contractors will face. PG&E hopes to engage problem solving from its contractors as plans for the Demolition operations are developed.
Some of the key challenges that PG&E anticipates include identifying ways to condense processing space, reduce processing time, ship more quickly, reduce waste quantities, and reuse soil and other waste streams where appropriate and technically feasible.
PAGE IA-41
HUMBOLDT BAY POWER PLANT SPacific Gasand DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012
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Attachment B Project to Completion Schedule PAGE IB-I
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HUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT ElecticCompany0 B.4 HBPP Project Completion Schedule. Description Introduction PG&E has developed its "Project to Completion Schedule" to assist in the long range planning and coordination for the Project. PG&E's "Project to Completion Schedule" provides relatively detailed planning of major tasks, including work that is to be performed by PG&E and by independent Contractors, and generally illustrates the level of interface and coordination that will be required on the Project. PG&E's "Project to Completion Schedule" identifies anticipated constraints and/or special considerations for planning/scheduling purposes, but is not to be considered all inclusive. PG&E's "Project to Complete Schedule" has been developed to facilitate long range planning for the Project but also to help vet out and identify potential obstacles to construction and to demonstrate approaches to mitigate the same. However, PG&E recognizes that the selected Contractor(s) may view potential obstacles otherwise based on its expertise and/or the means, methods, and manner of operations that it chooses to employ. Whereas each independent Contractor is required to develop and be responsible for its own detailed planning, scheduling, and work coordination, PG&E's "Project to Completion Schedule" is to be used as a reference and should not be considered as complete and/or mandatory.
Project Facilities Descriptions For the purpose of this writing, the following general descriptions of facilities to be decommissioned are provided. Refer to Attachment B.6, Other Relevant Illustrations, for depiction of the subgrade structures by System requiring excavation for a better understanding of the routing of underground utilities and extent of excavation required.
" Refueling Building (RFB) including the following:
o Reactor Pressure Vessel (RPV) and internals o Access Shaft contains reactor equipment/instruments that include piping, valves, instruments, etc., and is accessed through an Access Shaft at the +12 Elevation of the RFB to the -66 Elevation. The components within this area are subdivided by those components that are not attached to the RPV; and, those attached to the RPV. Removal of components attached is dictated by the water level in the RPV.
o Reactor Caisson o Drywell liner and activated concrete o Spent Fuel Pool (SFP) liner and three walls o RFB/SFP Area (+12) Operating Floor o East and West Suppression Chambers--includes Ring Header, Downcomers, and Liners
- Turbine Building including the following:
o Turbine Building Valve Gallery located beneath the Refueling Building at Elevations -14.
o Demineralizer Room Equipment, Piping, and Structure, divorced from the Turbine Building to maintain functionality of the equipment for SFP water cleanup. Located on the south wall of the RFB and immediately west of the railroad bay door.
- Units 1 and 2 Area-includes Units land 2 foundation slabs and sub-grade tanks, sumps, and trenches
- Upper Yard including the following:
o Solid RadWaste Handling Building (a lightweight, metal frame and siding structure) and Low Level Waste Building (a masonry block structure) s o High Level Storage Vault-a three-compartment, sub-grade, cast-in-place, reinforced concrete containment, with a footprint size 11 ft by 23 ft by 8 ft deep. The top of the PAGE IB-4
HUMBOLDT BAY POWER PLANT Pacific Gasand DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 vault is at grade elevation in the upper yard. The Contractor will remove the entire vault.
- North Yard including the following:
o Liquid RadWaste Building o Abandoned RadWaste Discharge Line and Abandoned RadWaste Tankage Drain Line-runs East short distance toward Discharge Canal, then runs South under RFB Crane Bay, then parallel to the Turbine Building. The abandoned discharge line dumped into Anchor Block "Y" under the southeast corner of the Hot Machine Shop. The abandoned tankage drain line continues southward, then parallels the circulating water discharge lines, terminating at the east side of the discharge structure considered South Yard piping).
o Liquid RadWaste Discharge Line (active)-runs from the LRW Building east, under RCA Way, then south, parallel to the road, then east to the Discharge Canal.
o East West Electrical Duct Bank-emanates from LRW Building, then runs west parallel to the LRW.
o LRW Offgas Tunnel-Emanates from LRW Building, then runs south toward RFB.
o East-West Offgas Tunnel-emanates from RFB toward LRW Building for short distance, then runs east-west parallel to RFB, and into SAS Building.
o SAS Building, a reinforced concrete structure originally constructed as a plant modification to house the hydrogen recombiner system. Unit 3 was not restarted after the system was installed; therefore, the structure is radiologically clean.
o Stack Base, a three-level reinforced concrete structure housing out-of-service gas monitoring piping and ventilation ducting. Piping and equipment will be removed by PG&E.
o Ventilation exhaust structure and SPAMS o Condensate Storage Tank (CST)-currently being removed by others.
o Fire Water Protection Lines o Storm Water Drain Lines
- South Yard including the following:
o Turbine Building Foundation Mat-Approximate overall size 90 ft wide by 110 ft long by 3 ft, 6 in. thick (nominally, thickness varies). The mat sits atop approximately 110 timber and concrete piles. (Ref. Plant Dwgs. 55420, 55421, and 55423).
o Offgas Tunnel from under RFB Crane Bay, then parallel to the Turbine Building.
o Southernmost section of Discharge Tank and LRW Abandoned Discharge Lines.
o Fire Water Protection Lines o Storm Water Drain Lines o Below Grade Electrical Lines
- Lower Yard including the following:
o Hot Machine Shop-CMU construction on a cast-in-place concrete slab with a bridge crane. This facility also houses a twenty-eight (28) ft deep, shielded source well. The well is an assembly of a lead-encased pipe in a grouted pipe sleeve. (Ref. Plant Dwg. 55473 for details) o Unit 3 Discharge Lines upstream of Anchor Block Y o Fire Water Protection Lines o Storm Water Drain Lines o Below Grade Electrical Lines
- Unit 3 Discharge Lines downstream of Anchor Block Y PAGE IB-S
Pacific Gas and HUMBOLDTBAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT Elecbic oupan'--
- Circulation Water Lines including the following:
o Units 1, 2, and 3 Intake Lines o Oily Water Separator
- Discharge Canal including the following:
o Structure/bridge on Bay side of Canal o Head Structure at point of discharge into Canal
- Intake Canal including the following:
o Intake canal Head Structure
- Unit 1 & 2 Area including:
o Unit 1 & 2 Foundation Slabs 0 Ancillary Structures outside of the RCA The following narrative provides a general overview of phasing for the Project, followed by a year-by-year description that summarizes the sequence of operations as they are currently envisioned by the "Project to Completion Schedule." This narrative uses words such as "shall," "will," and the like for the ease of writing, but it must again be reiterated PG&E's "Project to Complete Schedule" is not mandatory, as each independent Contractor is required to develop and be responsible for its own detailed planning, scheduling, and work coordination.
Outside of transferring the RPV internals to the SFP and segmenting thereof, work that has been performed to date on the HBPP Decommissioning Project can be generally described as PG&E self-performed component/equipment removals and decontamination efforts. However, starting with the award of major contracts for demolition of the Turbine Building to grade level in 2012 and the start of Intake Canal remediation work beginning 2014, the Project will transition into a contractor performed major civil works project. During this period, PG&E will continue with its component/equipment removals and decontamination while independent contractors develop detailed planning for the demolition/removals of above and below grade structures, systems, and utilities.
2014 begins with significant civil works activities with installation of a Slurry Wall around the North Yard, RFB, and Turbine Building slab as a means for controlling groundwater in below grade excavations. The Slurry Wall will encompass the RFB, North Yard, South Yard, and Turbine Building Slab and be constructed to a depth of approximately 170 feet to mitigate the intrusion of subsurface water into below grade excavations including, but not limited to, Offgas Tunnels removals, LRW related Discharge Lines, Stack/SAS Buildings foundations, Turbine Building Slab Removal, etc.
Construction of the Slurry Wall is anticipated to start at approximate station 550+00 and proceed in a counterclockwise direction through the Unit 2 Slab area, around the south end of the Turbine Building Slab, then northward. This will allow for demolition of the LRW to +12 to take place concurrent with the Slurry Wall installation with the LRW demolition completing prior to the Slurry Wall arriving at that location. It is intended that the Slurry Wall will be placed abutting the southern portion of the LRW slab to provide for North Yard removals to take place with protection from groundwater intrusion into excavations.
The Hot Machine Shop grade slab and the circulating Intake and Discharge pipe that runs between Anchor Blocks "W" and "Y" (under the Hot Machine Shop) will be removed to support installation of the Slurry Wall. Anchor Blocks "W" and "Y" remain in place based on the methodology approach for removal of the circulating water pipe, which leaves the anchor blocks in place. The anchor blocks, especially PAGE IB-6
HUMBOLDT BAY POWER PLANT Pacific Gas And DECOMMISSIONING CAPSTONE DOCUMENT Electric C yJUNE 2012 Anchor Block "X" located beneath the northwest corner of the Hot Machine Shop, may have to be removed to facilitate installation of the Slurry Wall.
Once the Slurry Wall is in place by mid-2014, demolition and/or removals of above and below grade structures, systems, utilities, etc. will proceed in earnest. Concurrent with operations taking place within the RFB, below grade structures, systems, and utility removals within the Slurry Wall will be advanced, starting at the North Yard and generally progressing southward in a clockwise fashion around the RFB, at which point the Turbine Building slab will be removed starting toward the latter part of 2014.
Thus, below grade structures, systems, and utilities that surround the RFB will be removed by the end of 2014, providing greater access to what remains of the RFB, including the SFP and the Reactor Caisson. At the conclusion of Drywell Liner and Activated Concrete removal, RFB structure removals will begin mid-2015, to be followed by removal of the SFP and backfill of the Reactor Caisson, which will continue through the summer of 2016.
Current planning envisions dredging/remediation work on the Project's Intake Canal to take place the first half of 2014 concurrent with the installation of the above mentioned Slurry Wall. Inasmuch as the Intake Canal runs parallel and adjacent to the sites primary access road, exceptional planning and coordination will be required of the Canal Remediation Contractor for placement of equipment, materials, spoils, etc., to limit interference with ongoing site operations including those of other contractors. The requirement for exceptional planning and coordination by the Canal Remediation Contractor also holds true for the dredging/remediation of the Discharge Canal that is planned to take place in succession with Intake Canal remediation work and into 2015.
Another major civil works scope of work on the Project includes the removal of Circulating Water Lines.
The Circulating Water System provided once-through cooling water to the Units 1, 2, and 3 steam condensers. The intake lines are paired runs of reinforced concrete pipe (RCP) with diameters of 30 inch for Units 1 and 2; and 39 inch for Unit 3. The discharge lines are single runs of 42 inch and 54 inch diameter RCP; the 54 inch pipe serving Unit 3. System construction is standard slip-joint RCP with thrust anchor blocks at directional changes to prevent pipe section separation.
The Final Site Survey Department has recommended the Circulating Water System piping be removed, based on the historically-high costs associated with cleaning, surveying, and grouting of similar systems in the industry.
In general, Circulating Water Systems piping will be removed in four phases. The first phase is being undertaken by PG&E and includes the removing approximately 150 lineal feet of the two Unit 3 Circulating Cooling Water Intake Lines and backfilling the open excavation with clean fill material by August 2012 to support installation of the new HBGS 60kV switchyard, which includes three new buildings. The location of the new HBGS 60kV Switchyard overlies the abandoned intake cooling water lines for Unit 3. The intake lines are a pair of 39-inch diameter, reinforced concrete pipes (RCP). The inlets to these pipes lie below the mean low water elevation in the Intake Canal.
In the second phase of Circulating Water Systems removals, the Civil Works Contractor will remove the sections of the Unit 3 Intake and Discharge Lines that emanate from the most southern end of the Turbine Building slab to Anchor Blocks "W" and "Y". This work will be performed in concert with the demolition and removal of the Hot Machine Shop and is predecessor to completion of Slurry Wall installation diminishing the availability of schedule float. Furthermore, the removal of these sections of the Unit 3 Intake and Discharge Lines and the Hot Machine Shop will be complicated by numerous underground systems and utilities in the area that will also be removed as part of these operations and high groundwater table conditions.
PAGE IB-7
HUMBOLDT BAY POWER PLANT Pacific faii: GaS a and d DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electri Companym After the pipe sections are removed, access to the massive anchor blocks will be greatly improved allowing them to be cleaned, surveyed, and grouted. Adjacent soils will be readily accessible for sampling and characterization. This approach offers little or no uncertainty as to the FSS condition required to justify leaving the anchor blocks in place and backfilling above them.
The third phase will entail the removal of Unit 3 Discharge Lines from the Discharge Canal to Anchor Block Y (adjacent to the Hot Machine Shop area) that is currently planned to begin in 2015 in succession with the completion of the Discharge Canal Remediation. It is anticipated that this work will begin at the Discharge Canal and progress westward.. This work will pose some extraordinary challenges due to the volume of soils to be excavated, the depth of the excavations, and the groundwater conditions that will be encountered. Furthermore, this work will severely limit access to RFB and the entire east end of the Project and, for this reason, should be completed prior to the start of SFP removal operations to limit interference with truck traffic.
For the last phase of Circulating Water Systems removals that is planned to take place during the last half of 2015, the Civil Works Contractor will remove the Units 1 & 2 Circulating Cooling Water Intake and Discharge Lines from the Anchor Block "Y" that sets underneath the southeast corner of the Hot Machine Shop to the Intake Structure and up to the Unit 1 & 2 slabs. This phase will also see the removal of the remaining Unit 3 Intake Lines up to Anchor Block "W" that sets adjacent to the Hot Machine Shop. Here again, it is intended that his work is will begin at Anchor Blocks "W" and "Y" and progress westward.
By mid-2016, most all structures, systems, and utilities will have been removed and final Site Restoration activities will take place until the conclusion of the Project in November 2016.
FSS-Each line item in the current "Project to Complete Schedule" was evaluated to determine if, and to what degree, radiological disposition surveys were required during excavation and decontamination efforts as well as post-excavation radiological FSS. When it was determined such surveys were required, corresponding individual activities were added to the "Project to Complete Schedule". The anticipated durations for each of the radiological survey activities added into the schedule were estimated, based on the experiences of the Radiological Control personnel involved including, but not limited to, experiences gained at the Yankee Rowe decommissioning project for soils work and the Fermi Plant decommissioning project for structures work. The durations assigned to each area requiring FSS was evaluated based on parameters such as surface area to be surveyed, potential for contamination, radiological characteristics of potential contamination, etc. Of particular note, the size of the SFP removal site and the characteristics of potential contamination associated with the SFP warranted the inclusion of a 2-month duration FSS activity into the schedule. This two month duration .FSS activity was included as a successor activity to post-SFP removal soil remediation activity that includes ongoing radiological disposition surveys. The aggregate duration for FSS activities is 31 months and is integral to the schedule as depicted.
2012 Of the many working and planned activities for 2012, a number have associated risks and challenges that should be noted. For all projects except those in the LFO area, unanticipated radiological contamination can cause delays, potentially affecting downstream critical path activities. The Critical Path activities for 2012 begin with Specialty Contractor Removal of the RPV Internals from the Reactor PAGE IB-8
HUMBOLDT BAY POWER PLANT Pacfic Gas n DECOMMISSIONING CAPSTONE DOCUMENT JUNE22 Electrc CompanyR Vessel. The RPV Internals will be removed from the RPV and placed into the Spent Fuel Pool (SFP) for final surveys and packaging. Some of the internals will be downsized inside the RPV, while others are downsized within the SFP prior to packaging.
The transfer of the Reactor Core assembly (Chimney) to the SFP has been completed. Maintaining the water level in the RPV for shielding purposes, removal/relocation of the remaining RPV Internals is currently underway and scheduled to be completed by November 2012.
Present work in the RPV includes removal of the Upper Core Guide (UCG), the process of removing the 4-hole Fuel Support Plates and the Control Rod Blade (CRB) guide tubes commenced. The Fuel Support Plates are packaged with no further downsizing required, while the CRB guide tubes are required to be cut in 2 sections for packaging. The Upper Shroud will be downsized in the RPV prior to transferring to the SFP for storage and subsequent loading in a special GTCC Waste Container (GWC) and Cask 6.
The beams and rod sections of the Lower Core Support are then cut out in the RPV and transferred to the SFP for packaging. This allows access for removal of the Control Rod Drive Index Tubes and later, removal of the Lower Shroud. Both the guide tubes and Lower Shroud are further downsized in the SFP.
The Feedwater Sparger and Peripheral Control Rod Drive piping are then downsized in the RPV and transferred to the SFP for packaging, while the remainder of the chimney is final down-sized in the SFP.
The RPV can be cleaned and drained at that time, to allow air gapping of the nozzles and removal of the Control Rod Drive Mechanisms.
Most of the RPV Internals components are packaged into 8-120 SFP liner baskets located in the SFP, awaiting final transfer into an 8-120 liner and cask, followed by shipment to an authorized off-site waste facility. The GTCC components (Upper Shroud, Upper Core Guide and Chimney Hangers) remain staged in the SFP until they are loaded into the GWC and Cask 6 along with the ISC-18 Processed Waste Container. The strategy to segment, consolidate and ship and/or store A/B/C waste created by the internal segmentation of the Reactor Vessel follows the anticipated activities associated with the scheduled contingency plans 1, 2 & 3. This consists of the following steps; (plan 1) the use of nine (9) B-8-120 liners to accommodate the generated waste during segmentation and the use of the industry standard B type cask for shipment to a Certified disposal site. Contingency Plan 2, would involve the building of a B/C waste containment facility (ISFISI Style facility) at the Humboldt Bay Power Plant (HBPP) site in the interim period awaiting a disposal plan and facility, and the Contingency Plan 3 which would entail the development of a "dufrane" style facility to shield the concentrated B & C waste also in the interim period awaiting a qualified disposal facility.
In preparation for Cask 6 loading the new HOLTEC GWC container redesign and manufacture may take longer than initial estimates. Moving the GWC requires the use of the VCT from Diablo Canyon Power Plant (DCPP). Its availability is based on current planned DCPP outages, which can last up to 3 months.
The proposed process by the off-site contractor may not withstand the testing criteria of PG&E and therefore delay.the completion of our ISC-18 waste.
The project risks associated with the above activities and subsequent waste removal activities are as follows: Delays in segmenting (downsizing) caused by contractor equipment problems, lack of RPV water clarity, or loss of the Refueling Building Crane would ultimately delay RPV shell segmentation and SFP draining which would result in a delay in the demolition of the Refueling Building. A Radiological contamination event inside the RFB or a radiological exposure resulting from the segmentation activities or transfer of components would result in a delay of work activities. Lack of an authorized off-site PAGE IB-9
HUMBOLDT BAY POWERPLANT SPacific ElcticGasCas andny DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 waste facility for Class B/C waste would require additional project funds and resources to build an on-site facility to hold the waste and could result in delays in SFP draining and demolition of the Refueling Building. Lack of 8-120 B casks would result in similar delays since numerous waste liners require the "B" cask for shipment of the liners to the off-site waste facility.
As the RPV Internals are removed/relocated to the SFP, the RPV will then be drained and fixatives applied planned for completion in January 2013.
Concurrent with the Reactor Vessel Internals transfer and segmentation work, PG&E will perform non-Critical Path removals of piping, valves, instruments, etc., from the Reactor Access Shaft Chamber through the Access Shaft at the +12 Elevation of the RFB. The removals from within the Reactor Access Shaft Chamber in 2012 will initially be limited to those components that are not directly connected to the RPV. As Energy Solutions completes its RPV Internals removals and the RPV is drained (approximately 9,000 gallons) during the months of November through mid-January 2013, PG&E will begin removing the remaining components connected to the RPV from the Reactor Access Shaft Chamber. PG&E will also initiate removal of Ring Headers and Downcomers from the Suppression Chambers starting mid-2012.
Through the first half of 2012, PG&E will continue its removal of equipment and components from the Turbine Building, including the remainder of the main steam and feedwater lines from the Valve Gallery at the interface of the Turbine Building and RFB. At this point, PG&E will install a six (6)-ft. high CMU wall to isolate the Valve Gallery from the Turbine Building. A sliding metal door will be installed to provide an exit path for dismantled valves and piping. A mobile crane will be positioned on the Reactor Feed Pump Room floor slab to lift commodities within and out of the valve gallery. Construction of the Isolation Wall is scheduled for completion July 2012. The selected Turbine Building demolition Contractor will then proceed with asbestos abatement and concrete surface decontamination (or scabbling) in the Turbine Building, followed by demolition of the Turbine Building to the +12 elevation (i.e., slab level) planned for completion February 2013.
PG&E will continue with its Phase 1 Equipment/Pipe Removals from the Liquid RadWaste Building (LRW) that consists of out-of-service or abandoned process waste tanks including the Condensate Storage Tank through December 2012. LRW Phase 1 Equipment/Pipe Removals work in 2012 is on a parallel Critical Path for the Project as this work and subsequent partial demolition of the LRW Building to +12 elevation is preparatory work for Slurry Wall installation.
PG&E will also continue with its Equipment/Pipe Removals from Offgas Tunnels and the Stack located in the North Yard area through 2012.
A new SFP Water Processing System will be installed, and a new system with water storage tanks in the yard will be installed to ship the processed SFP water off-site.
The existing site roadways were designed to support the operational and maintenance needs of the HBPP fossil and nuclear generating facilities. The heavy truck and equipment traffic experienced during the decommissioning of the fossil and nuclear units exceeds the original design expectations and has resulted in severe deterioration of the roads, which has created safety concerns for pedestrian as well as vehicular traffic. In addition, this degradation of the roadways has led to serious environmental consequences, including sediment runoff and elevated turbidity levels in stormwater discharges, to the point that a Notice of Violation (NOV) has been issued to HBPP this year. In 2012, a modification to the graveled entrance and exit at the Portal Monitor and Truck Scale located in the Count Room Parking Lot will be completed. The objective is to minimize the potential for sediment runoff during rain events in PAGE IB-10
HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT Efrclc CompanyJ order to avoid future Environmental NOVs. The project will remove 6 inch to 8 inch of existing soil and gravel from the roadway. Clean, crushed, and washed aggregate will be installed and compacted. In addition, a vehicle bypass around the portal monitor will be installed, as well as a pedestrian walkway.
Ongoing road repairs are planned to be performed in the third and fourth quarters of 2012. The work will be performed in phases to permit adequate ongoing access to critical locations. The repair work will consist of excavation and removal of the existing asphalt and road base, installation of upgraded sub-base, road base, and asphalt. Stormwater control features are included in the road redesign. Temporary environmental controls will be implemented and maintained during the construction activities to minimize any environmental impacts.
Road improvements after 2012 will be minimal and will be sequenced as necessary to avoid affecting truck movement during periods of peak debris shipments.
2013 The Project Critical Path will remain with the draining and application of fixatives planned for completion in January 2013. Once Energy Solutions demobilizes its RPV Internals Equipment from the RFB/SFP Area (+12) Operating Floor in May 2013, its existing RFB decontamination facility will be removed and a new RPV containment structure will be erected over the Reactor Caisson by August 2013. The new RPV containment structure will allow Siempelkamp to proceed with its segmentation and removal of the RPV Vessel from the Reactor Caisson that will continue through April 2014.
The RPV shell is segmented by Siempelkamp following draining and application of fixatives inside the vessel. Following the draining of the RPV PG&E will remove those components (Control Rod Drive Mechanisms (CRDMs), etc.) and air gap nozzles located beneath the RPV with planned completion in June 2013. PG&E will also construct a Drywell Containment Structure. The process chosen for the segmentation is the window tendon method with five elevations identified. Once RPV shell sections (windows) on the lower three shell elevations are removed, the vessel insulation will then be removed and the RPV nozzles will then be air-gapped. Following supporting of the lower head of the reactor, the tendons (and nozzles) will be removed. The vessel support ring and support rods will then be removed, concurrent with removal of the two upper RPV sections. Following installation of a support platform in the drywell, the remaining two upper RPV sections will be downsized. Finally, the lower head of the reactor will be removed from the bottom of the drywell, and packaged into a special shipping container.
The vessel shell sections will be loaded directly into shipping containers as each section is removed from the vessel.
The project risks associated with the RPV shell segmentation activities are as follows: Removal of the Control Rod Drive Mechanisms from the RPV bottom will be performed in a high-dose area with the possibility of resulting high exposures. Coordination of multiple contractors (segmentation and insulation/asbestos removal) could result in schedule delays for RPV removal, and would subsequently delay drywell equipment removal. The RPV nozzles and portions of the drywell piping have asbestos insulation, and abatement and removal of the asbestos could cause schedule delays. Removal of the insulation and the air-gapping of the vessel nozzles will require working in a high dose radiological environment due to activation of the RPV cladding in the belt-line of the RPV. Contractor delays in equipment design, fabrication, and mockup testing of the specialized equipment would result in schedule delays. Contractor equipment used for the RPV shell segmentation is very sophisticated and is PAGE IB-11
HUMBOLDT BAY POWER PLANT Pacific Gds and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electoic COmpany custom built, consequently, damage to this equipment requiring replacement or fabrication could result in schedule delays.
Once Energy Solutions demobilizes its RPV Internals Equipment from the RFB/SFP Area (+12) Operating Floor in May 2013, PG&E will decontaminate and/or apply fixatives to the area. RFB Concrete Scabbling operations will then begin in December 2013, to be completed by June 2014. Concurrent with RFB Concrete Scabbling operations, PG&E will remove the Turbine Building Drain Tank (TBDT) and decontaminate/isolate the Reactor Equipment Drain Tank (REDT). Final disposition of the REDT will be a part of Caisson final remediation.
Concurrent with Siempelkamp's RPV segmentation operations, PG&E will continue to remove the Ring Header and Downcomers from the Reactor Suppression Chambers with completion planned for December 2013. PG&E will also continue and complete removing components connected to the RPV from the Reactor Access Shaft Chamber once the RPV is drained, with completion planned for February 2014. PG&E will also proceed with the removal of asbestos from pipe and equipment in the Reactor Drywell, with completion of this work planned for February 2014.
The parallel Critical Path for the Project will continue with Phase 2 Equipment/Pipe Removals from the Liquid RadWaste Building (LRW) that is planned for completion in October 2013, followed by scabbling of contaminated concrete within the LRW scheduled for completion December 2013. Removals and concrete scabbling in the LRW are predecessor to partial demolition of the LRW structure and the construction of a Slurry Wall more fully discussed below for work performed in 2014.
Currently, the Low Level Waste Storage Building (LLW) and the Solid Waste Handling Buildings (SWH) in the Upper Yard are being used to support the packaging and shipping of Equipment/Pipe Removals from the LRW. Upon completion of Phase 2 LRW Equipment/Pipe Removals, decontamination and demolition of the LLW, and the SWH structures and removal of the High Level Storage Vault (HLSV) in the Upper Yard can begin and, hence, have Early Start dates in October 2013 with scheduled for completion in early 2014. (Note: The HLSV is close to the sub-grade, north retaining wall for the Liquid RadWaste tank vault. If the tank vault and the HLSV are not demolished concurrently, protection of the LRW tank vault retaining wall may be necessary.) However, once the Upper Yard facilities are no longer used to support the packaging and shipping of LRW Equipment/Pipe Removals, the decontamination and removal of the Upper Yard structures are relatively independent of other operations and thus have considerable schedule float providing great flexibility in scheduling.
Concurrent with Phase 2 Equipment/Pipe Removals from the LRW in the North Yard, PG&E will remove components from within the Stack, grout embedded piping in the Stack, and remove the Stack to the
+12 elevation planned for completion April 2013. This will be followed by complete removal of SAS Building that sets adjacent to the Stack down to elevation +9 and backfill of the excavation site. While not on the Project's Critical Path, this work is also predecessor to construction of a Slurry Wall that will take place in 2014, as it will remove above grade obstructions to Slurry Wall construction equipment.
In further preparation for Slurry Wall installation in 2013, equipment/components will be removed from the Hot Machine Shop, followed by decontamination efforts (including concrete scabbling) and building demolition to +9 elevation. The Hot Machine Shop demolition will take place in conjunction with Unit 3 Intake/Discharge Lines removals between Anchor Blocks "W" and "Y" as will the removal of below grade systems, utilities, etc., in the immediate vicinity and has very limited schedule float. Backfill of the area will take place after Final Status Survey (FSS) and will run concurrent with the start of Slurry Wall installation. Correspondingly, partial removal of the Unit 2 slab (and associated timber pilings) will be removed to accommodate installation of the Slurry Wall.
PAGE IB-12
HUMBOLDT BAY POWERPLANT Pacific Gasand DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electic Compan JN Ž1 Turbine Building demolition to +12 elevation (i.e., slab level) is planned to start in November 2012 and be completed February 2013. Upon completion of the Turbine Building demolition, PG&E will resume its removal of equipment and components from the Valve Gallery at the interface between the Turbine Building and RFB, with planned completion in November 2013.
2013 will also see the Civil Works Contractor remove sections of the Unit 3 Intake and Discharge Lines that emanate from the most southern end of the Turbine Building slab to Anchor Blocks "W" and "Y".
This work will be performed in concert with the demolition and removal of the Hot Machine Shop and is predecessor to completion of Slurry Wall installation diminishing the availability of schedule float.
Current planning has the removal of Unit 3 Intake and Discharge Lines between the southern end of the Turbine Building slab to Anchor Blocks "W" and "Y" occurring in January 2014. As such, this work will run concurrent with the start of Slurry Wall installation requiring increase planning and coordination effort.
Remediation of the Intake Canal is also planned to initiate in December 2013 and continue into 2014.
2014 The Liquid RadWaste Building (LRW) is located within the area known as the North Yard. An independent contractor provided an assessment of demolition methods and durations, which is included for convenience of the bidder:
The building is composed of two distinct structures. The first is the steel building that was built over the Liquid RadWaste Storage area. The storage area is composed of Tanks and heavily reinforced concrete storage vault. The building will be decontaminated prior to release for open air demolition.
" Review and Develop/Quantities of Materials:
- 1. Quantities were developed from plans of the building.
- 2. Phase 1:To +12 Steel Bldg. and Concrete Vault - Steel 32 tons Concrete 274 cubic yards
- 3. Phase 2:To +9 Retaining Walls, Slab and Footings - Concrete 559 cubic yards
- 4. Container Quantity Intermodals - 1,698 ton/16 ton each = 106 intermodals
- 5. Phase 1: 36 Intermodals
- 6. Phase 2: 70 Intermodals
- Suggested methods of Removals:
- 1. Removal to +12: Excavators equipped with hydraulic shears, hammer, concrete pulverizers, and bucket/thumb attachments.
- 2. Removal to +9: Excavators equipped with hydraulic hammers, pulverizers, and bucket/thumb attachments.
- 3. Removal of 18 in. Piling: Excavators equipped with hydraulic shears to cut piling to +9 Elevation
- 4. Use of debris trucks to haul debris to waste management facility
" Suggested material handling and debris flow:
- 1. The schedule for Installation for new waste handling facility, this activity is in the development phase and is anticipated to have no impact on the removal of the LRW Building.
- ROM Task Durations:
- 1. Phase 1: Remove LRW to +12 Elevation - 24 Days
- 2. Phase 2: Remove Slab Retaining Walls and Footings +9 Elevation - 35 Days PAGE IB-13
HUMBOLDT BAY POWER PLANT PacificGag anid DECOMMIBSIONING CAPSTONE DOCUMENT JUNE 2012 The Project Critical Path continues in the RFB with removal of asbestos from Drywell Pipe/Equipment, Drywell Systems Removals, and removal of asbestos from Drywell Liner penetrations planned for completion November 2014. The Critical Path will then continue through Drywell Liner Removal beginning in November 2014 and continuing to April 2015.
As stated previously, draining of the SFP is preferred to occur prior to completion of the Slurry Wall with fixatives being applied to the SFP Liner completing in January 2014. Work will advance with SFP Liner Removal from January to May 2014 then shaving of the SFP concrete walls and floor from May until August 2014. At this point, work in the SFP will await Drywell Liner Removal and subsequent activities in 2015.
Coinciding with the completion of SFP Liner removal operations, removal of the SFP Bridge Crane and decontamination/isolation of the Reactor Equipment Drain Tank (REDT) that is embedded in the tremie concrete at the bottom of the Reactor Caisson at -66 elevation will proceed and is planned for completion January 2015 (final disposition of the REDT shall be considered as part of Caisson remediation).
Concurrent with operations in the Drywell and SFP but not on the Project Critical Path, the Suppression Chamber Liners will be removed between January and May 2014.
The parallel Project Critical Path in 2014 continues with the partial demolition of the LRW Building to the
+12 elevation (north, east, and west walls are to remain as they serve as retaining walls for the adjacent hillside) and the construction of the Slurry Wall slated to occur between January and July 2014.
As noted above, construction of the Slurry Wall is anticipated to start at approximate station 550+00 and proceed in a counterclockwise direction through the Unit 2 Slab area, around the south end of the Turbine Building Slab, then northward. This will allow for demolition of the LRW to +12 to take place concurrent with the Slurry Wall installation with the LRW demolition, completing in February 2014 prior to the Slurry Wall arriving at that location.
Likewise, removal of Unit 3 Intake and Discharge Lines between the southern end of the Turbine Building slab to Anchor Blocks "W" and "Y" and subsequent soil remediation and backfill of the area will complete in February 2014. Anchor Blocks "W" and "Y" and intermediate Anchor Block "X" remain in place based on the methodology approach for removal of the circulating water pipe, which leaves the anchor blocks in place. The anchor blocks, especially intermediate Anchor Block "X" that is located underneath the northwest corner of the Hot Machine Shop, may have to be removed to facilitate installation of the Slurry Wall.
Simultaneous with the operations taking place within the RFB and after the Slurry Wall has been constructed, below grade excavations/removals in the North Yard including, but not limited to, LRW Tunnel removal, Offgas Tunnels removals, Electrical Duct Bank Removals, Stack, and Condensate below grade structures/slabs removals, Fire Water Protection Lines, Storm Water Drain Lines, etc. will proceed.
It is anticipated that the North Yard removals will be completed in December 2014.
Below Grade excavations/removals will generally proceed from July to October 2014 through the South Yard with the removal of any remaining sections of the Abandoned Liquid RadWaste Discharge Line to Anchor Block "Y," the Abandoned Tankage Containment Drain Line, and the Liquid Radwaste Discharge Line not removed to support installation of the Slurry Wall. With a planned start in September 2014, the South Yard Offgas Tunnel (excluding the section that runs under the RFB) will be removed in concert with the removal of the Turbine Building Slab from September to December 2014.
PAGE IB-14
HUMBOLDT BAYPOWER PLANT uPacific Gas And- DECOMMISSIONING CAPSTONE DOCUMENT UE21 Electric Company JUN Remediation of the Intake Canal will continue through June 2014 followed by remediation of the Project's Discharge Canal from June 2014 through March 2015.
2015 Critical Path work in 2015 will remain with removal of the Drywell Liner scheduled for completion April 2015 followed by removal of Activated Concrete from the Drywell that will continue through July 2015.
At this point, demolition of the RFB Building structure to +12 elevation and removal of the RFB+12 Slab at the Crane Bay will occur and be completed November 2015. Thereafter, demolition of the SFP will take place completing in February 2016.
Outside of work in the RFB, remediation of the Discharge will continue through April 2015 at which time the removal of Unit 3 Discharge Lines from the Discharge Canal to Anchor Block Y (adjacent to the Hot Machine Shop area) will begin. It is anticipated that this work will begin at the Discharge Canal and progress westward. This work will severely limit access to RFB and the entire east end of the Project and, for this reason, is planned for completion August 2015 prior to the start of SFP removal operations in November 2015 to limit interference with truck traffic.
Following the removal of Unit 3 Discharge Lines from the Discharge Canal to Anchor Block Y,the Civil Works Contractor will remove the Units 1 & 2 Circulating Cooling Water Intake and Discharge Lines from the Anchor Block "Y"that sets underneath the southeast corner of the Hot Machine Shop to the Intake Structure and up to the Unit 1 & 2 slabs. This phase will also see the removal of the remaining Unit 3 Intake Lines up to Anchor Block "W" that sets adjacent to the Hot Machine Shop. Here again, it is intended that his work is will begin at Anchor Blocks "W" and "Y" and progress westward. Albeit that this last remaining component of Circulating Cooling Water Lines removals has planned Early Start in August 2015, alternate access around the excavation site (e.g. through the Unit 1 & 2 area) should be available at this time by thoughtful phasing of this work affording additional flexibility through utilization of schedule float.
2016 The Project Critical Path runs through Soil Remediation (including ongoing radiological disposition surveys) at the SFP removal site during February and March 2016 followed by FSS of the SFP removal area. The size of the SFP removal site and the characteristics of potential contamination associated with the SFP warranted the inclusion of a 2-month duration FSS activity into the schedule. At the conclusion of the SFP area FSS, backfilling of the Reactor Caisson, removal of the remaining RFB +12 Slab, and backfill of the SFP removal area to proceed and be complete August 2016. Concurrent with the start of SFP backfill operations, final Site Restoration activities will be initiated. Thus, the Project Critical Path consists of Site Restoration activities schedule for completion November 2016.
While not on the Project Critical Path, the remaining portions of the LRW slab will be removed to +9 elevation in conjunction with final Site Restoration as will the removal of remaining Site Drainage Systems.
PAGE IB-15
HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 ElecticCompanyR B.5 HBPP P6 Critical Path and Schedule Considerations Decommissioning of the Refueling Building (RFB), which houses the Reactor Pressure Vessel (RPV),
drives the current Critical Path for the Project. It is important to note that a key milestone driving the Critical Path is the removal and transfer of Reactor internals to the SFP where they are segmented and packaged under the shielding water of the Spent Fuel Pool (SFP). In this same regard, segmentation and removal of the RPV cannot commence until all the necessary transfers are made and the RPV drained.
Structure demolition including, but not limited to, SFP concrete walls/floor demolition, RFB demolition, etc., cannot be initiated until all of the RPV and Drywell Liner and systems components are removed and the SFP is drained following completion of segmenting, packaging, and removal of all components from the SFP. Moreover, SFP concrete walls/floor demolition and its successor activities are additionally subject to potential in-leakage of groundwater and, thus, will not take place until a Slurry Wall is installed around the structures.
The current "Project to Complete Schedule" sequences the draining of the SFP to initiate after internals and legacy waste are processed out of the SFP but prior to the completion of Slurry Wall installation around the structures. Sequencing the SFP draining in this fashion provides valuable schedule float to deal with uncertainties associated with SFP removals and demolition as discussed below. Similarly, the removal of Suppression Chambers Liners are also planned to occur independent of Slurry Wall installation. Additionally, the draining of the RPV that is not subject to potential groundwater in-leakage is planned to start immediately after RPV components have been segmented and removed independent of Slurry Wall installation.
PG&E's "Project to Completion Schedule" incorporates results from a constructability review of how best to remove the SFP Liner conducted by a specialty contractor including development of a schedule/sequence with durations. Under the planned sequencing, the SFP will have been drained and fixatives applied to the SFP Liner to hold in place any removable contamination, the overhead bridge crane will be removed in preparation for SFP Liner removal. The SFP Liner removal will take place under cover with the Refueling Building still be in place.
The SFP Liner material to be removed consists of 3,012 sf walls of 10-gauge sheet steel (16,867 Ib) and 520 sf floor of X" plate (5,200 Ib). Removal methods include using a rod mill to cut the SFP Liner free from the fixed welded connections, using a remotely operated mechanical tool, using nibblers, or reciprocating saws. To prepare the work area, rod mill cut places of the liner to gain access for the Brokk, and use the Brokk to pry the liner away from the wall. Cut the wall liner into small pieces (approximately 3 foot by 3 foot) that can be placed within the SFP into smaller boxes; floor removal, rod mill the floor into larger pieces that can be directly rigged into full size disposal container; rigging/removal of floor plate sections; clean-up work area; and a 15 percent contingency. The SFP Liner segments shall be sized to fit into the 7 foot x 17 foot disposal bins or removed and downsized to fit in the bins.
The specialty contractor depicted a 72-day workday schedule for removal of the SFP Liner. However, Contractors are alerted to concerns that cracking, which occurred in the SFP prior to liner installation during early operations of the HBPP, could impede the SFP draining process from groundwater in-leakage. That being said, it is anticipated that the selected Contractor(s) should anticipate employing measures to mitigate water in-leakage (injecting sealant into SFP walls, etc.) if it elects to remove Liners and/or have the SFP drained prior to the completion of Slurry Wall installation.
An alternate approach would involve the draining of the SFP and application of fixatives and removal of the SFP Liner as successor to the installation of the Slurry Wall. This alternative approach would place PAGE IB-16
HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT Elecic Company JUNE 2012 the draining of the SFP and the subsequent removal of the SFP Liner, and shaving of the SFP walls/floor on the Critical Path of the current "Project to Complete Schedule". The current "Project to Complete Schedule" also anticipates a November 2016 Project Completion date. If the selected Contractor chooses to have the SFP drained after Slurry Wall installation, analysis of the Project to Complete Schedule indicates Project completion would not occur until several months later.
Another potential drawback to delaying draining of the SFP, until after Slurry Wall installation is the prolonged interface and coordination requirements related to significant radiation control work taking place within the SFP, Drywell, and Suppression Chambers. Hence, risks associated with integrating civil works projects with significant radiological control work would be protracted and the transition to a major civil works construction project would be impeded. Recognizing the inevitable consequences and risks of this integration, PG&E's "Project to Complete Schedule" places great emphasis on completing significant radiological control work early.
Notwithstanding the relationship between SFP draining and Slurry Wall installation that must be contemplated in Contractor planning and scheduling, the Contractor must also take into consideration "Hot Spots" detected in SFP Floor Liner (some up to 1000R) in planning its work including, but not limited to, when to have the SFP drained. Likewise, the Contractor's planning should evaluate remediation of the 1 Y2"perforated drain line that Plant Drawing's show embedded in a 6" gravel base (French Drain situated between the SFP Floor and Tremie Seal. The valuable schedule float garnered through draining of the SFP prior to Slurry Wall installation may prove to be essential in dealing with these challenges.
As noted above, the Drywell Liner does not communicate with the surrounding water table and resides within the inner concrete cylinder of the concrete caisson as noted above. Therefore, the Drywell Liner can be removed immediately after the drywell systems and cavity are removed and abated from asbestos.
A specialty contractor conducted an independent review on how best to remove the Drywell, including development of a schedule/sequence with durations. Under the planned sequencing, the RPV will already have been removed with the Refueling Building still in place and the overhead crane operational. The Drywell Liner structure needs to be cut into reasonable sized pieces and loaded into disposal boxes that will be staged on the refueling floor level +12 El.).
If the Drywell Liner and Suppression Chamber Liners are removed at the same time, the work zones are very close to each other and may use the same exit points for materials and personnel access. Rigging of items above vertical shafts is intrinsically dangerous, hence interactions such as this need to be rigorously scheduled. Emphasis should be placed on the actual methods for removal.
The specialty contractor depicted a 110-day workday schedule for removal of the Drywell Liner to prepare the work area, break out concrete within bottom section of Drywell Liner; cut bottom free from structure; cut vertical lines within structure; perform horizontal cuts; pick and remove; clean-up of work area; and a 15 percent contingency.
A specialty contractor conducted an independent review of how best to remove the east and west Suppression Chamber Liners, including development of a schedule/sequence with durations. The Reactor Suppression Chambers, commonly referred to as the East and West Suppression cells, are located concentrically around the Reactor Drywell, creating a 300-degree partial annulus. The remainder of the annulus is a vertical access shaft on the north side of the Reactor Caisson that connects the Refueling Building with the equipment compartments and the bottom of the Caisson. The Suppression Chambers are approximately 12 ft, 8 in wide and 49 ft tall (minus 17 to minus 66). Planning for this work PAGE IB-17
HUMBOLDT BAYPOWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT
,ElectrcCompany Ue2, JUNE2012 included preparing the work area including air management systems and installation of equipment; cutting roofing Liners (cut into manageable pieces that can be man-handled); inner and outer wall panels gross removal (cut into larger sheets and sized further at floor level); wall clean-up (burn flush with concrete all imbedded material); floor panel removal; remove improvements and clean project area; and a 15 per cent contingency.
The specialty contractor depicted a 91-day workday schedule for removal of the Suppression Chambers Liners. Contractors are alerted to concerns that cracking, which occurred in the Suppression Chambers during early operations of the HBPP, could impede the Suppression Chambers Liner removal operations from groundwater in-leakage. Accordingly, Contractors should consider appropriate mitigative measures when planning for this work.
An independent review of how best to remove the band of activated concrete in the wall of the Reactor Caisson around the fuel zone was conducted by a specialty contractor including development of a schedule/sequence with durations. Under the planned sequencing, the Reactor Vessel and the Suppression Chamber and Drywell Liners will have been removed. The refueling building will still be in place and the overhead crane will be operational.
The specialty contractor depicted a 69-day workday schedule for removal of the Drywell Activated Concrete to: prepare the work area and Brokk stage and seal lower area (close of doorway access into -
66' El. zone); hammer surface concrete exposing reinforcing steel (remove approximately 6 inches of concrete surface); survey the reinforcing steel and first cut surface; replace hammer on Brokk for shear and cut the reinforcing steel, allowing it to drop to the lower level; replace the hammer and remove a further 6 inches of concrete; survey the concrete surface at 12 inches; hammer the next 6 inches of concrete; (survey the concrete surface at 18 inches; if required and structurally reasonable continue spot concrete removal; final survey; remove seal of doorway from - 66' El.; load out debris; clean-up work area; and a 15 percent contingency. In accordance with a structural analysis conducted on behalf of PGE by URS in June of 2012, up to 21 inches of concrete can be removed while maintaining required structural integrity of the facility.
An independent review of how best to remove the SFP walls was conducted by a specialty contractor including development of a schedule/sequence with durations. The SFP is a poured-in-place concrete vault. Rough internal dimensions are 20 ft wide by 26 ft long by 26 ft deep. One corner of the SFP has the cask pit, which is a further 10 ft deeper (i.e., 36 ft deep) and measures approximately 13 ft by 10 ft.
A portion of the cask pit has a shared wall with the Suppression Pool Caisson wall. The walls range from 2 ft, 6 inches thick up to 4 ft, 6 inches thick (thickest wall is on the south side at the connection to the Drain Tank Vault. The concrete is reinforced predominantly with a rebar mat just below the inner and outer wall surfaces). All concrete is to be removed with the exception of the west SFP wall. Hence, there is approximately 350 cubic yards of concrete to remove (approximately 700 tons).
Prior to SFP wall demolition, contamination found in cracks needs to be investigated and removed. The SFP is below grade; hence, its removal is contingent on water control during the process. This analysis assumes the Slurry Wall has been installed. Concrete of this size can be wire-sawed into pieces and lifted out or broken with a large hydraulic impact hammer. Wire-sawing is slow, expensive, and produces a cutting slurry, which is difficult to control. The preferred approach is focused on using hydraulic impact hammers.
The outer walls that have soil on one side of them would be excavated to allow successful breaking of the concrete and to prevent the soil from failing into the work area. A mid-sized excavator (45 ton) with a 12,000 ft/lb impact hammer can reach and break material up to 30 ft below ground surface PAGE IB-18
HUMBOLDT BAY POWER PLANT Pacific Gas and DECOMMISSIONING CAPSTONE DOCUMENT Eiectric Company" JUNE 2012 (depending on the angle and reach of the machine). Thus, the machine can break all the walls from the
+12 level and the base slab. The machine will bench down a few feet to complete the work in the Cask Pit. The same machine can remove the material and load a disposal box by switching the hammer for a bucket or another machine can be used. A shear mounted on the same or other machine is used to cut the rebar reinforcing steel.
The specialty contractor depicted a 44-day workday schedule for removal of the spent fuel pool walls to prepare the work area; excavate and remove soil from north and east walls; hammer walls (north, east, south) and remove material as progress is made; bench down to allow access to cask pit; hammer and remove cask pit; clean-up work area; and a 15 percent contingency applied.
Remediation of the Intake and Discharge Canals are currently scheduled to take place starting on the Intake Canal in December 2013 and working continuously through completion of the Discharge Canal currently planned for April 2015. The Canals remediation process will generate considerable quantities of soils that will have to be processed for reuse or processed for waste shipments. Contractors are reminded that the canals remediation work is scheduled to run continuously through the regions rainy seasons and must make appropriate provisions in its planning and scheduling of this work to address weather concerns either through adoption of process facilities and/or judicious use of schedule float.
The aforementioned concerns for working in wet weather conditions also applies to other work activities requiring excavations including, but not limited to, removals of Units 1, 2, & 3 Intake and Discharge Lines especially the removal of Discharge Lines downstream of Anchor Block "Y".
In succession with the completion of the Discharge Canal Remediation, removal of Unit 3 Discharge Lines from the Discharge Canal to Anchor Block Y (adjacent to the Hot Machine Shop area) is currently planned to begin in 2015. It is anticipated that this work will begin at the Discharge Canal and progress westward. This work will pose some extraordinary challenges due to the volume of soils to be excavated, the depth of the excavations, and the groundwater conditions that will be encountered.
Furthermore, this work will severely limit access to RFB and the entire east end of the Project and, for this reason, is planned to be completed prior to the start of SFP removal operations to limit interference with truck traffic.
For the last phase of Circulating Water Systems removals, the Civil Works Contractor will remove the Units 1 & 2 Circulating Cooling Water Intake and Discharge Lines from the Anchor Block "Y" that sets underneath the southeast corner of the Hot Machine Shop to the Intake Structure and up to the Unit 1
& 2 slabs. This phase will also see the removal of the remaining Unit 3 Intake Lines up to Anchor Block "W" that sets adjacent to the Hot Machine Shop. Here again, it is intended that his work is will begin at Anchor Blocks "W" and "Y" and progress westward. It is anticipated that at the time this last phase of Circulating Water Systems removals takes place that alternate access around the excavation site (e.g.
through the Unit 1 & 2 area) should be available at this time by thoughtful phasing of this work affording additional flexibility through utilization of schedule float.
The Contractor must take into consideration the close coordination requirements of the Circulating Water Systems removals with other work on the Project.
PAGE IB-19
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HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Company' Attachment C HBPP Decommissioning Permitting Strategy PAGE IC-2
HUMBOLDT BAY POWER PLANT PacificGas and ,
- DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electrc Company -
HBPP Decommissioning Permitting Strategy Project Information County Humboldt PM OP Order Number JCN Project
Title:
HBPP Decommissioning Completion Schedule Project Manager: Kerry Rod Phone #: 707) 444-6504 Environmental Manager Suresh Chandnani Phone #: (707) 444-6505 Land Planners: Marvin Penner Phone #: (415) 816-1216 Ernie Ralston (415) 973-3215 Project Summary:
PG&E is currently in the process of full decommissioning and license termination for its former power generation facilities at the 143-acre Humboldt Bay Power Plant (HBPP) site in Humboldt County, California. The HBPP decommissioning effort will transition into a major civil works project as PG&E nears the successful removal of radiologically significant plant systems from the buildings.
The purpose of this document is to provide a planning level strategy for securing development permits needed to support elements of the planned decommissioning work that has not been authorized through prior permitting efforts.
The five major civil work projects that will span the next five years at HBPP are as follows:
- 1. Turbine Building Demolition-The scope of work includes asbestos abatement primarily of the reactor feed pump raceways and penetrations, 50,000 square feet of concrete surface decontamination, and open air demolition of a concrete structure.
- 2. Intake and Discharge Canal Remediation-This scope of work includes mechanical removal of radiologically and chemically contaminated sediment from the Intake and Discharge Canals, demolition of the discharge outfall and levee to Humboldt Bay, demolition of the intake and discharge outlet structures, restoration of levee and coastal trail along the Bay, management and dewatering of sediments, and water treatment.
- 3. Nuclear Facilities Demolition and Excavations--This scope of work includes decommissioning and demolition of all remaining permanent plant structures and facilities, including significant subgrade structure excavation. To provide groundwater control and isolation, removal of the spent fuel pool will necessitate installation of a bentonite slurry wall to the clay layer that will encompass the Reactor Building Caisson and other deep structures in the Unit 3 area. Note that this project will potentially include removal of the Reactor Caisson and Foundation Piles.
- 4. Office Facility Demobilization--This scope of work includes removal and/or demolition of office facilities including buildings and structures owned and leased by PG&E. Most of buildings and structures to be removed are modular or trailer type construction. Leased trailers and structures are to be isolated, disconnected, removed from HBPP, and returned to the owner. Buildings and structures owned by PG&E are to be isolated, disconnected, demolished, and disposed as waste, PAGE IC-3
HUMBOLDTBAY POWERPLANT Pacific GAs. and DECOMMISSIONING CAPSTONE DOCUMENT JUNE2012
.Electric COmpany unless released for salvage or recycle. This scope of work includes an estimated thirty-two (32) building units comprising approximately forty thousand (40,000) square feet.
- 5. Final Site Restoration--This scope of work includes any final remedial actions contained in the Remedial Action Plan as necessary to restore the site to industrial uses. The primary scope of work will include restoration of specific land areas to functioning wetlands (see attached figure),
establishing final grade and surfacing of roads and industrial use areas, and potentially land improvements needed to support ongoing industrial operations at the site to include transmission department storage and operations, independent spent fuel storage installation (ISFSI) security operations, and ongoing power production of the Humboldt Bay Generating Station (HBGS).
Eventually, these items will need to be defined in detail for permitting purposes.
In addition to these civil works projects, PG&E is pursuing permits to perform dredging of Fisherman's Channel in the neighboring community of King Salmon. The project is a community outreach project aimed at improving navigational access across PG&E property to private boat slips connected to the channel. Moreover, a project to perform maintenance dredging of the discharge canal has recently been proposed and will require permitting. While these two efforts are not included in the description of the planned civil works projects, they will require permitting efforts and are described herein.
Regulatory Framework Lead Agency-Nuclear Regulatory Commission (NRC)
Lead Development Agency-California Coastal Commission (CCC)
Key Supporting State Agencies:
Department of Toxic Substance Control (DTSC) (Remediation)
Regional Water Quality Control Board (Industrial Wastewater and Stormwater)
Key Approvals In order for the decommissioning project to proceed beyond the current level of authorization, the NRC must approve the license termination plan and CCC must issue Coastal Development permits for developments not included in CDP E-09-010 (see following discussion). An additional key approval is needed from DTSC of the Remedial Action Plan in order to establish final remedial actions and clean up criteria.
Other Agencies: Authorizations and/or consultations with several other federal, state, and local agencies may be necessary for specific elements of the project. The focus of this strategy document is the development permits and associated environmental reviews required to proceed with the planned work.
Permitting Status Federal: The NRC has authorized PG&E to commence decommissioning activities in accordance with its post-shutdown decommissioning activities report. The NRC concurs that federal environmental review (National Environmental Protection Act [NEPA]) requirements have been adequately addressed through the Final Generic EnvironmentalImpact Statement on Decommissioning of Nuclear Facilities (GElS) and updates. Based on the analysis contained in the GELS, PG&E's evaluation of site-specific issues, and the supplemental analysis contained herein, PG&E continues to conclude that Unit 3 decommissioning will be accomplished with no significant adverse environmental impacts. For NRC to terminate PG&E's license, PG&E must submit, at least 2 years in advance of license termination, an LTP for review and PAGE IC-4
HUMBOLDT BAY POWER PLANT DECOMMISSIONING CAPSTONE DOCUMENT Electic Comppany approval by NRC. The license termination plan is scheduled to be submitted in 2013. Chapter 8 of the LTP contains a summary of the environmental setting and potential impacts.
California Coastal Commission: On December 10, 2009, the CCC approved Coastal Development Permit (CDP) CDP E-09-010 for decommissioning the HBPP. All work is authorized to proceed with the exception of the following:
- Work in the intake or discharge canals
- Removal of the Spent Fuel Pool and Reactor Caisson
- DTSC Remediation Activities not addressed under the Interim Measures Removal Action Workplan (IMRAW)
- Construction of a waste storage facility for Class B&C Wastes
- Final Site Restoration, including final grading and surfacing, wetlands restoration, and permanent developments On September 9, 2011, CCC approved CDP E-11-018 for construction of a storage facility for Class B&C Wastes. The storage facility has been designed but is unlikely to be constructed in lieu of shipping the wastes offsite.
Regional Water Quality Control Board: The Water Board authorizes discharges of low-level liquid radiological wastewater under an existing National Pollutant Discharge Elimination System (NPDES) permit. The Water Board additionally administers the project's Construction General Storm Water Permit. Current work with the Water Board includes the addition of an Active Treatment System (ATS) to the Stormwater Pollution Prevention Plan (SWPPP). The ATS will manage water collected in excavations associated with removal of subgrade structures and soil. No permits or formal authorizations are anticipated beyond approval of the SWPPP revisions.
Department of Toxic Substances Control (DTSC): An Interim Measures Removal Action Work Plan detailing procedures for handling and disposing of incidental soil generated as a result of decommissioning activities has already been completed and is in place. Additional documents anticipated include ecological and human health risk assessment reports, a feasibility study that will evaluate remedial options for soil and groundwater, and a remedial action plan that will provide details on the selected remedial solution. The DTSC will administer the California Environmental Quality Act (CEQA) compliance process for the applicable site investigation and remedial activities.
Local Permits and Authorizations: Humboldt County has issued numerous building permits, grading permits, and demolition permits for qualifying activities. Such permits will continue to be obtained as necessary work plans and designs are completed. Additionally, several asbestos National Emission Standards for Hazardous Air Pollutant (NESHAP) notifications have been filed with the North Coast Unified Air Quality Management District (NCUAQMD) for asbestos abatement work and a permit for discharging collected excavation water to the Humboldt Community Services District sewer system is in place.
Summary The following table summarizes the permitting status as applicable to the civil works projects planned.
The section that follows identifies issues and recommends an approach for each permitting effort.
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W HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electrc CWmpa"y Turbine Building Demolition CDP E-09-010 authorized demolition of CCC Permit is in place. Project can I the turbine building proceed.
Nuclear Facilities Demolition and CDP E-09-010 authorizes most project CCC CDP Amendment for SFP and Excavations elements except SFP removal and Caisson Removal caisson removal.
Intake and Discharge Canal Remediation CDP CCC Remedial Action Plan DTSC CWA Section 404 Permit USACE CWA Section 401 Certification Regional Water Board Environmental Review NMFS USFWS DFG Office Facility Demobilization CDP E-09-010 authorizes removal of Coastal Commission Permit is in place.
temporary facilities. Project can proceed.
Final Site Restoration Coastal Development Permit CCC Remedial Action Plan DTSC CWA Section 404 Permit USACE CWA Section 401 Certification Regional Water Board Additional Consultations/Approvals NMFS, USFW, DFG, Humboldt County, Harbor Distinct Fisherman's Channel Dredging Harbor District Permit Humboldt Bay Harbor District Coastal Development Permit CCC CWA Section 404 Permit USACE CWA Section 401 Certification Regional Water Board Additional Consultations/Approvals NMFS, USFWS, DFG Notes:
CCC = California Coastal Commission CDP = Coastal Development Permit CWA = Clean Water Act DFG = California Department of Fish and Game DTSC = Department of Toxic Substance Control NMFS = National Marine Fisheries Service SFP = Spent Fuel Pool USACE = U.S. Army Corps of Engineers USFWS = U.S. Fish and Wildlife Service Recommended Permitting Approach to Support Decommissioning Completion Schedule The following outlines the permitting work planned to support the proposed completion schedule for the HBPP Decommissioning Project.
As of the current completion schedule, five distinct development permitting efforts are necessary to support the completion schedule:
- 1) Maintenance Dredging for the Discharge Canal: This permit is to support maintenance requirements and is not directly related to supporting the civil works projects.
- 2) Fisherman's Canal Dredging: This is a community outreach project and is not directly related to supporting the civil works projects.
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HUMBOLDT BAY POWER PLANT PacificGas,and DECOMMISSIONING CAPSTONE DOCUMENT Electic CmUNaE21
- 3) Remediation of the Discharge and Intake Canals (Includes DTSC Remedial Action Plan): This permitting effort supports the civil work project to remediate the canals.
- 4) CDP Amendment for Spent Fuel Pool/Slurry Wall and Caisson Removal: This permitting effort supports the civil works project to perform nuclear facilities demolition and excavations not already covered by CDP E-09-010.
- 5) Final Site Restoration Permitting: This permitting effort supports the civil works project to perform final site restoration.
Basis for Segregation of Permitting Efforts and Opportunities for Synergies There are opportunities to combine certain permitting elements, particularly with respect to agency scoping meetings, data gathering, sampling, and surveying in support of work inside the discharge and intake canals. However, the permitting efforts listed previously are being managed as individual permitting efforts for the following reasons.
Maintenance dredging of the discharge canal is an immediate need with an isolated impact footprint within the existing industrially developed property. As described in the following text, it is hoped to obtain maintenance exclusion for the work under Section 30610 of the Coastal Act. Combining this effort with other permitting efforts would complicate and delay the maintenance work unnecessarily. It is understood, however, that agencies working on multiple permits will need to be briefed on the sequence of unrelated permitting efforts in order to reduce confusion and maintain transparency.
Fisherman's Canal dredging is a navigational improvement project outside the PG&E-controlled area of HBPP. Dredging for the sole purpose of navigational improvement may be exempt from coastal development permitting per Section 30610 of the Coastal Act. The Humboldt Bay Harbor and Recreation District is the lead agency for this permitting effort. This is the only permitting project that is a navigational improvement project and is the only permitting project whereby the Harbor District is the lead agency; therefore, we are proposing to manage it as an independent permitting effort. Moreover, since this project is community driven and potentially involves work on private parcels, it will be important that the project be permitted separately and have a separate public involvement campaign.
The placement of dredge spoils will be an important consideration if future restoration projects will require fill and, as such, this effort will be coordinated closely with Permitting Tasks 3 and 5.
Remediation of the Discharge and Intake Canals is integrated with the DTSC Remedial Action Plan for the site in that cleanup levels and remedial actions must be authorized through a DTSC issued RAP prior to obtaining CCC authorization. It is further anticipated that DTSC will perform a CEQA analysis and determination for the project. While permitting the final restoration of the canals in concert with remediation would be logical, the final restoration plans have yet to be concluded. The timing of final site restoration is driven by Final Status Survey activities and agency acceptance of the final site restoration plan, while the remediation effort is driven primarily by DTSC and CCC permitting. To avoid further complication and delay of the remediation project permitting, permitting for the final site restoration plan is proposed to be managed as a separate permitting effort.
The CDP Amendment for Spent Fuel Pool/Slurry Wall and Caisson removal project is anticipated to be very similar to the process that was completed through CCC to authorize the B&C storage facility. The original CDP E-09-010 for decommissioning contains a discussion of the Spent Fuel Pool/Caisson removal project and requires PG&E to apply for an amendment to the CDP once decisions and plans were completed for the disposition of the Spent Fuel Pool and Caisson. If specific elements of the final site restoration efforts are scheduled to occur prior to the scheduled issuance of the final restoration plan PAGE IC-?
HUMBOLDT BAY POWER PLANT Pacific Gas And DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Company permits, those elements could be brought into this amendment process, assuming there are no significant environmental issues.
The final site restoration plan permitting is estimated to be the longest duration and the most complex in terms of agency review and negotiations. The final site restoration plans will involve all the agencies included with the previous permitting efforts and will additionally require CEC coordination and authorization. Additionally, at least two agency deliverables are integral to the final site restoration plan-a post-construction stormwater plan and a final site restoration plan. Further consideration must be given to the myriad of permit and license conditions that limit reuse options for portions of the site (ISFSI security perimeter, Buhne Point Preserve, coastal access trail, etc.). Discrepancies between existing permit conditions and proposed end state are likely to require a mitigation plan that must be approved as part of the final site restoration permitting. For these reasons, this permitting effort is being managed as a stand-alone CDP permit.
While each permitting effort will be managed as an independent project, there will be opportunities to take advantage of common resources and activities to gain efficiency and accelerate the schedule. For example, sampling and biological surveys needed to support work in the canals could be combined to support each of the three permitting efforts involving canals. Additionally, there are opportunities to establish mitigation plans that will compensate for multiple projects, or alternatively, restoration performed under one project could be used to mitigate impacts from another project. It is envisioned that the mitigation plan prepared for the final site restoration effort will consider the compensation needs for the overall decommissioning project. The plan will strive to provide a balance between PG&E's operational requirements going forward (e.g., maintaining a temporary roadway permanently for site access) and the agency's requirements for natural resource impact compensation (e.g., creation of additional wetland or marsh areas).
The basic strategy for each of the individual permitting efforts is outlined in the following text.
Maintenance Dredging for the Discharge Canal This immediate permitting need recently surfaced as the result of sedimentation build-up in the discharge canal that must be removed to avoid potential flooding and to comply with dilution specifications contained in the facility's offsite dose calculation method document.
Lead Agency-California Coastal Commission Supporting Agencies-Humboldt Bay Harbor and Recreation District, USACE, USFWS, NMFS, DFG Approach Seek concurrence from CCC that the maintenance exclusion under the Coastal Act applies and that there are no potential environmental impacts. Seek concurrence from the Humboldt Harbor District that Coastal Commission is lead permitting authority. Obtain necessary USACE nationwide (NWP 3) permit, if determined applicable.
Target Schedule
- Initiate discussions with agencies: June 2012
" Collect required biological, water quality, and characterization data: June-July 2012
- Obtain necessary permits and authorizations by September 2012 PAGE IC-8
HUMBOLDT BAY POWER PLANT EPacific Gas, AndJUE21 DECOMMISSIONING CAPSTONE DOCUMENT Elecc JUNE 2012 Fisherman's Canal Dredging This project, which involves navigational improvements to the community of King Salmon, is driven by public demands for improving access to private boat docks that are affected by sedimentation of the canal.
Lead Agency-Humboldt Bay Harbor and Recreation District Supporting Agencies-CCC, USACE, USFWS, NMFS, DFG Approach Obtain required permits for dredging through traditional means, including required environmental surveys, sediment characterization, and bathymetry survey. Explore options for dredged spoil disposal to include saltwater marsh habitat creation in the intake canal. Public outreach activities will continue as needed to support the schedule.
Target Schedule
- Initiate discussions with agencies: June 2012
" Collect required biological, bathymetry and characterization data: July 2012 - February 2013
" Obtain necessary permits and authorizations by November 2013 Remediation of the Discharge and Intake Canals This project involves remediation of the Discharge and Intake Canals. The Intake Canal remediation is expected to be limited to radiological constituents. The Discharge Canal may contain both radiological and chemical constituents that require removal.
Lead Agency-CCC (CDP)/DTSC (RAP)
Supporting Agencies-USACE, DTSC, Regional Water Quality Control Board, USFWS, NMFS, DFG Approach Obtain required permits for dredging through traditional means, including required environmental surveys, sediment characterization, and bathymetry survey. DTSC authorization required via approved Remedial Action Plan. CEQA analysis will performed by DTSC. Dredged spoil management assumes disposal at US Ecology, ID.
Target Schedule
- Initiate discussions with agencies: June 2012
- Collect required biological and characterization data: August-October 2012
- Obtain necessary permits and authorizations by December 2013 CDP Amendment for Spent Fuel Pool/Slurry Wall and Caisson This project involves the installation of a bentonite slurry wall for groundwater control during Spent Fuel Pool removal operations and includes the removal of the Spent Fuel Pool structure. This permitting effort will additionally include removal of the Caisson if a decision is made to permit its removal.
Lead Agency-CCC Supporting Agencies--Regional Water Quality Control Board (water management, treatment, and discharge PAGE 1C-9
HUMBOLDT BAY POWER PLANT PacificGas and DECOMMISSIONING CAPSTONE DOCUMENT JUNE 2012 Electric Companya Approach Develop project description and apply for an amendment to CDP E-09-010. Address water management and discharge needs through ATS provisions of the General Construction Stormwater Permit.
Target Schedule
- Develop Project
Description:
June -September 2012
" Prepare and Submit Application Materials: October 2012 -February 2013
" Obtain necessary permits and authorizations by October 2013 Final Site Restoration, Including Final Grading and Surfacing, Wetlands Restoration, Permanent Developments This project establishes the final end use of the site post-decommissioning and obtains the necessary authorizations for development supporting the selected end use. The required post construction stormwater plan and DTSC remedial actions outside the canals will be included in this permitting effort.
Lead Agency-CCC (CDP)/DTSC (RAP)
Supporting Agencies--Regional Water Board (Post Construction Stormwater Plan),
USFWS/DFG (Wetland Creation), DTSC (Final Remedial Actions and Industrial Reuse Requirements)
Approach Develop final site restoration plan with endorsement by various PG&E departments. Prepare and gain approval of post-construction stormwater plan. Negotiate trade-offs with CCC (e.g., keep the count room and mitigate elsewhere).
Target Schedule
- Prepare preliminary final site restoration plans: June -October 2012
- Develop and review ancillary plans and negotiate trade-offs: October2012 -July 2013
- Obtain necessary permits and authorizations by December 2014 Summary of Key Milestones in Support of the Completion Schedule Detailed activity schedules have been prepared for each permitting activity and have been integrated into the decommissioning completion schedule. The following table contains a summary of key milestones and anticipated dates.
Permit Name Milestone Target Critical Path Notes Complete Date Date 1 Canal Maintenance Dredging Project Start 6/4//12 6/8/12 Completion schedule at risk. Not started as of 6/8/12.
Application Submittal 8/22/12 8/29/12 Project start on critical path per current completion schedule.
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HUMBOLDT BAY POWER PLANT PacificGas and GJUNE DECOMMISSIONING CAPSTONE DOCUMENT 2012 Permit Name Milestone Target Critical Path Notes Complete Date Date Permit Complete 9/26/12 - Project physical work has no schedule, critical path undetermined.
2 Fisherman's Canal Dredging Project Start 6/4/12 7/10/12 Project physical work has no schedule, critical path may change.
Application(s) Submittal 5/2/13 6/15/13 Critical path date based on permit completion schedule.
Permit Complete 11/13/13 - Project physical work has no schedule, critical path undetermined.
3 Canal Remediation Project Start 6/28/12 7/16/12 Application(s) Submittal 5/16/13 7/1/13 Coastal Commission Application Permit Complete 12/9/13 1/5/13 Canal remediation scheduled for February 2014.
4 CDP Amendment SFP/Caisson Project Start 6/25/12 8/30/12 Application(s) Submittal 2/18/13 7/10/13 CDP Amendment application.
Permit Complete 10/1/13 3/12/14 Slurry wall install scheduled for April 2014 5 Final Site Restoration Project Start 7/12/12 7/5/13 Application(s) Submittal 5/23/13 5/21/14 Permit Complete 12/16/14 1/16/16 Restoration scheduled to start February 2016.
Basis of Schedule Estimates The permitting efforts described herein have not been initiated as of June 8, 2012. The detailed schedules and milestone summary rely on several that have yet to be validated. Key assumptions that are subject to change due to circumstances and that assumptions may have material impacts on the overall completion schedule include the following:
- Estimated project start dates are contingent on assignment of PG&E resources and procurement of necessary external resources within the timeframes estimated to support project start dates.
- Pre-application (scoping) meetings are assumed to occur within 30 days of the project start dates.
The schedule for pre-application meetings and subsequent agency meetings are subject to change based on the availability of agency resources.
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HUMBOLDT BAY POWERPLANT EPacific Gas andJUE21 DECOMMISSIONING CAPSTONE DOCUMENT Fi Electric CompanyU
- Estimated application submittal dates are contingent on agency concurrence with the proposed permitting approach, including assumed applicability of permits and approval of proposed exemptions or exclusions.
- Estimated application submittal dates are contingent on availability of complete project descriptions needed to support scoping meetings, environmental reviews, and permit applications.
- Completion and acceptance of environmental reviews within periods estimated rely on assessment findings that support mitigated negative declaration or lesser level of project impacts. None of the projects will require a full Environmental Impact Report.
- USACE Nationwide permits are assumed the applicable permit vehicle where USACE permits are required. Discovery of endangered species or their habitats in the project areas and availability and effectiveness of avoidance measures may have significant impacts on the project schedules.
- Project schedules do not account for significant changes in the project descriptions during the permitting phases of work. For example, if the project area is expanded, scope is added, or additional developments are proposed during the permitting process, the schedule will require revision.
- Each of the permitting efforts identified will require public review and comment processes. The schedule assumes that public outreach efforts will be performed to mitigate the potential for significant public concern or issues that could delay the permitting efforts.
- Agency resources are assumed adequate to manage multiple environmental reviews and permit applications concurrently.
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