ML23233A150

Extent of Condition Request for 2023 Confirmatory Survey

ML23233A150
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	08/11/2023
From:	Amy Snyder Reactor Decommissioning Branch
To:	Hazelhoff A Exelon Generation Co
References
Download: ML23233A150 (1)

Text

From: Amy Snyder To: Amy C. Hazelhoff Cc: Shaun Anderson; Greg Chapman; Karen Pinkston; Louis Caponi (He/Him); David Hills; Bill Lin

Subject:

Zion Confirmatory Survey Extent of Condition Date: Friday, August 11, 2023 11:18:00 AM Attachments: FINAL Summer-converted using Microsoft print PDF.pdf image001.png Hi Amy, Based on the risk-informed survey evaluation criteria developed prior to the 2023 Zion Confirmatory Survey (ML23221A243, attached), NRC staff have assessed the factors discussed using the available confirmatory surface data and other information. One concern that staff currently have is that whether detectable particles may still be present in portions of the site that were not scanned at 100% with discrete radioactive particles (DRP) data quality objectives ( DQOs), particularly at or near the Southeastern portion of the site.

Given:

the pattern of DRPs and activated material found and removed since 2020 the results of the 2023 Zion Confirmatory Survey at or near the South portion of the property surrounding several survey units that were not hand scanned using the ZS Survey Plan DQOs or included in the scope of the confirmatory surveys (SU 10221 and 10211) (See maps below) and the past rail waste loading activities that occurred at the south end of the site an evaluation of extent of condition for the Southeastern portion of the site is needed consistent with the ZS Confirmatory Survey Criteria (see page 11, column 3 of the ZS Confirmatory Survey Criteria attached).

One approach for the evaluation of the extent of condition that would be acceptable to the NRC:

To ensure that cross contamination of DRPs in SU 10221 and 10211 did not occur as a result of rail loading of waste at or near the south rail loading area, hand scanning SUs 10221 E,F,G,& H and 10211 A&B at 100% coverage to ensure that there are no gaps in the extent of condition to identify and remove DRPs could be done.

Additionally:

A sample collected from SU 12101 had Eu-152 at 5.19 pCi/g. There are no Derived Concentration Guideline Levels (DCGLs) for EU-152 in soil only for concrete in the power block. Staff have a concern whether Eu-152 should be a radionuclide of concern (ROC) for soil in this, and possibly adjacent, survey units.