Attachment_2_Task_Order_No_2_Statement_of_Work.pdf

TASK ORDER NO. 2

STATEMENT OF WORK

1. PROJECT TITLE

Multi-Source Integrated Site PRA

2. BACKGROUND

A full-scope integrated site Level-3 Probabilistic Risk Assessment (PRA) for a commercial nuclear power plant site can provide valuable insights into the relative importance of various risk contributors by assessing the risks of accidents involving one or more major site radiological sources, including: reactor units, spent fuel pools (SFPs), and dry cask storage (DCS). These insights can be used to further enhance regulatory decision making and to help focus limited agency resources on issues most directly related to the agency's mission to protect public health and safety.

Although Level-3 PRAs have been performed to some extent within both the U.S.

and international nuclear industries, the NRC has not sponsored development of a Level-3 PRA for a nuclear power plant site since NUREG-1150.1 In the more than two decades that have passed since the NUREG-1150 Level-3 PRAs were performed, numerous technical advances have been made that were not reflected in the NUREG-1150 PRA models. The staff has also identified additional scope considerations not previously considered that could be addressed by performing a new full-scope integrated site Level-3 PRA.

During the Annual Commission Meeting on Research Programs, Performance, and Future Plans on February 18, 2010, the staff proposed a scoping study to evaluate the feasibility of performing a new full-scope integrated site Level-3 PRA for a nuclear power plant site. On March 19, 2010, the Commission expressed conditional support2 for Level-3 PRA related activities and directed the staff to provide the Commission with various options for proceeding with this work that included costs and perspectives on future regulatory uses for Level-3 PRAs. On July 7, 2011, the NRC technical staff responded to the Staff Requirements Memorandum (SRM) by providing three proposed options for proceeding.3 These three options consisted of:

(1) maintaining the status quo (i.e., continuing with evolutionary development of PRA technology); (2) conducting focused research to address identified gaps in existing PRA technology before performing a full-scope integrated site Level-3 PRA; and (3)

1 NUREG-1150, "Severe Accident Risks: An Assessment for Five U.S. Nuclear Power Plants," Vol. 1, December 1990 (ADAMS Accession No. ML120960691).

2 SRM 100218, "Staff Requirements-Briefing on Research Programs, Performance, and Future Plans," dated March 19, 2010 (ADAMS Accession No. ML100780578).

3 SECY-11-0089, "Options for Proceeding with Future Level 3 Probabilistic Risk Assessment Activities," dated July 7, 2011 (ADAMS Accession No. ML11090A039).

conducting a full-scope integrated site Level-3 PRA for a selected nuclear power plant site. On September 21, 2011, the Commission approved a modified version of the third option, which extended the completion schedule from three years to four years.4

3. SCOPE

The objective of this task is to expand and update Probabilistic Risk Assessment (PRA) methods used in nuclear regulatory activities, in compliance with the 1995 Nuclear Regulatory Commission (NRC) policy statement for implementing risk-informed regulation.

4. SPECIFIC TASKS

The contractor shall provide technical assistance as requested by the to support the NRC in development of a multi-source integrated site PRA model. This model shall encompass all major site radiological sources for a specified commercial nuclear power plant site, including all operating reactor units, SFPs, and DCS. This support shall include participation in the following work activities:

Selection and implementation of a method for multi-source integrated site PRA model development and integration

Multi-source integrated site PRA model accident sequence delineation

Multi-source integrated site PRA model accident sequence quantification

The contractor shall provide support for the above work activities in consideration of:

the Level-1, Level-2, and Level-3 analyses; all hazards; all modes of operation; and all major site radiological sources, including all operating reactor units, SFPs, and DCS. This support shall also include necessary interfacing with the relevant personnel supporting the development of the multi-source integrated site PRA model for each of the prior tasks. Following the conclusion of the contractor's support of a given work activity, the contractor shall provide a letter report detailing the contractor's analysis and support of that work activity.

The contractor shall provide reports of the work performed for a given work activity.

These reports shall include, at a minimum, the following elements:

Sources of information used and a description of each information source

Information about any data that was used (e.g., parameter values, uncertainty distributions, basis for a given parameter value and uncertainty distribution)

Modeling assumptions including the bases for a given modeling assumption and the impact, potential or actual, on the PRA

4 SRM-SECY-11-0089, "Staff Requirements-SECY-11-0089-Options for Proceeding with Future Level 3 Probabilistic Risk Assessment (PRA) Activities," dated September, 21, 2011 (ADAMS Accession No.

ML112640419).

Sources of model uncertainty, a description of the sources of model uncertainty, and the impact on the PRA from a given source of model uncertainty

The NRC shall provide the relevant documentation templates to the contractor, which include the minimum report requirements, as described above. Following the conclusion of the contractor's support of a given work activity under Task 2, the contractor shall provide a letter report detailing the contractor's analysis and support of that work activity.

5. DELIVERABLES AND DELIVERY SCHEDULE

A Monthly Letter Status Report (MLSR) shall be provided by the contractor by the 20th of each month. This report will be used by the Government to assess the adequacy of the resources proposed by the contractor to accomplish the work contained in this contract and provide status of contractor progress in achieving tasks and producing deliverables. The report shall include contract/order summary information, work completed during the specified period, milestone schedule information, problem resolution, travel plans, and staff hour summary. The MLSR shall be delivered via email in PDF format.

6. LEVEL OF EFFORT

The estimated Level of Effort for Task Order 2 is 700 Hours.

7. PLACE OF PERFORMANCE

It is expected that the work will be performed at the contractor’s site.

8. TRAVEL

Estimated travel to NRC Headquarters in Rockville, Maryland, for Task Order 2 is shown in the table below.

Meeting Title Estimated Date Number of Contractor Personnel to Attend Meeting

Kickoff Meeting At Start of Task 1

Progress Meeting No. 1 3 Months After Start of Task 1

Progress Meeting No. 2 6 Months After Start of Task 1

Draft Report Presentation 8 Months After Start of Task 1

Final Report Presentation 12 Months After Start of Task

Meeting Title Estimated Date Number of Contractor Personnel to Attend Meeting

Contingency Meeting No. 1 Unspecified 1

Contingency Meeting No. 2 Unspecified 1

9. PERIOD OF PERFORMANCE

12 Months from effective date of task order.

10. SECURITY

The work to be done under this contract is UNCLASSIFIED.