ML24102A188

Omaha Public Power District Presentation Given at the March 27, 2024 Public Meeting on Submittal of Phase I Final Status Surveys for the Decommissioning of Fort Calhoun Station, Unit 1

ML24102A188
Person / Time
Site:	Fort Calhoun
Issue date:	03/31/2024
From:	Baker A Omaha Public Power District
To:
References
Download: ML24102A188 (1)

Text

Phase I Final Status Sur vey Repor tFor t Calhoun Station Pre-Submittal Meeting

March 2024

1 Purpose of the submittal & Basic Process Information

Submittal Over view A genda

Timeline & Schedule

Closing and Q&A

2 FCS Phase 1 FSS Pre-Submittal Meeting Purpose

• To discuss the basics of our submittal and the timeline for review

• Fo r the License Termination process, the site is broken into smaller land units

• Radiation sur veys are per formed on those units based on their impact classification (I, II, or III)

• Class III units are the least impacted by radiological activity of the 3 classifications

• The sur veys involve a high volume of paper work to document all the required data

• 1000s of pages

3 Final Status Sur vey Basics

Final Status Sur veys (FSS)

Measurements and samples are collected to determine the final radiological conditions of remaining structures, basements (including penetrations), soil, buried piping, and fill that was used during demolition at the time of License Termination

4 Final Status Sur vey Basics Radiological Criteria for License Termination Criteria for Unrestricted Use in 10 CFR 20.1402:

• Dose Criterion:residual radioactivity that is distinguishable from back ground radiation results in a Total Ef fective Dose Equivalent (TEDE) to an average member of the critical group that does not exceed 25 mrem per year, including that from groundwater sources of drinking w a t e r.

• ALARA Criterion: residual radioactivity has been reduced to levels that are as low as reasonably achievable (ALARA).

5 Final Status Sur vey Basics

• Given the large volume of paper work

• Data is submitted in phases

• Makes reviews and documentation easier

• The For t Calhoun Station (FCS) 1st phase is ready for submittal

• Will be followed by at least three more

• The final submission will be af ter removing the last radiological material from site

6 Methodology, Tec hnical Input & Regulator y Guidance Utilized to Develop the Phase I Repor t The Phase 1 Final Status Sur vey Final Repor t (FSSR) and Sur vey Release Records (SURs) were developed in accordance with the following documents:

• NUREG-1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance

- Characterization, Sur vey, and Determination of Radiological Criteria,

• NUREG-1575, Multi-A gency Radiation Sur vey and Site Investigation Manual, (MARSSIM),

• Chapter 5 of the For t Calhoun Station Decommissioning Project License Termination Plan, and,

• LT/FSS Group Plans and Procedures.

7 Phase I Repor t Over view The Phase 1 Final Status Sur vey Repor t (FSSR ) addresses 1 2 open land area (OLA) sur vey units

S u r vey U n i t Size (m2)

S u r vey U n i t Ty p e Description Class

8101 OLA Nor th OCA 3 9 9, 210 810 2 OLA Nor th OCA 3 74,685 810 3 OLA Nor th OCA 3 58,497 810 4 OLA Nor th OCA 3 99,971 810 5 OLA Nor th OCA 3 99,994 810 6 OLA Nor th OCA 3 99,788 810 9 OLA Nor th OCA 3 98,266 8110 OLA Nor th OCA 3 105,611 8202 OLA Nor th OCA 3 54,169 8203 OLA Nor th OCA 3 99,184 8305 OLA Nor th OCA 3 98,059 8 3 07 OLA Nor th OCA 3 90,659

8 Phase I Repor t Over view Major Elements of Phase I FSSR:

• Final Status Sur vey Program Over view

• Final Status Sur vey Protocols

• Instrumentation Utilized for Sur veys

• Sur vey Types

• Sur vey Findings

• Summar y/ Conclusion

• Individual Release Records for Each Sur vey Unit

9 Phase I FSSR Sur vey Results

• The sur vey units addressed in the Phase I FSSR have met the DQOs of the FSS sample plans developed and implemented for each unit.

• In each sur vey unit, all identified radionuclides of concern (ROC) were used for statistical testing to determine the adequacy of the sur vey unit for FSS, and sample data passed the Sign Test.

• No judgmental or investigational measurements exceeded the sum of fractions (SOF) of one when compared to the Operational DCGL (OpDCGL).

• A Retrospective Power Cur ve showed that adequate power was achieved.

10 Phase I FSSR Sur vey Results

• The sur vey units addressed in the Phase I FSSR have met the DQOs of the FSS sample plans developed and implemented for each unit (cont)

• No anomalies were identified during the per formance of the FSS.

• Each of the sur vey units was properly classified.

• In accordance with the LTP Section 5.10, all the Phase 1 sur vey units meet the release criteria.

11 Phase I Final Status Sur vey Re p o r t Lessons Learned and Precedents The Project incorporated the following Lessons Learned when developing the Phase I FSSR:

• Added multiple layers of reviewers, up to the corporate level, to ensure accuracy of documentation.

• Limited the number of sur vey units in each phase. We are challenged by the schedule in the later phases of the FSSR but are evaluating ways to break phases III

& IV into more manageable repor ts.

• Added Radiological Assessment (RA) data to release records like data for excavation RAs that happened beneath the soil of a sur vey unit.

Submittals will closely resemble the LaCrosse BWR FSS Repor ts

12 Phase I FSS Re p o r t Review Timeline

• Timeline for review and feedback

• Licensee would like to request that comments or information requests be provided at least a month prior to the submittal of the Phase II FSS Repor t

• This will ensure that we can implement any learnings from the NRC review and incorporate them into the Phase II FSSR

• The Phase II FSS repor t is currently scheduled for submittal by the licensee at the end of July 2024

• Repor ts for phases III and IV are scheduled to be submitted in July 2026 and September 2026, respectively

13 Phase I FSS Final Repor t Review Timeline Review Documentation

• Licensee would like to discuss how the NRC will document their review of each phase submitted

• Due to lessons from previous submittals

• Long project timelines (year s)

• Staf f turnover s (industr y -wide)

• Dif ficulty in remembering such detailed information over time

14 Phase I FSS Final Repor t Pre-Submittal Meeting

• Questions:

• Methodology?

• Submittal specifics or submittal method?

• Timeline?

• Reviews?

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