L-24-263, Nuclear Power Plant - 30-Day Voluntary Report in Accordance with Industry Groundwater Protection Initiative
| ML24332A080 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 11/27/2024 |
| From: | Penfield R Vistra Operations Company |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-24-263 | |
| Download: ML24332A080 (1) | |
Text
L-24-263 Page 2 cc:
NRC Regional Administrator - Region III NRC Project Manager NRC Resident Inspector Ashtabula County Emergency Management Agency Geauga County Emergency Management Agency Lake County Emergency Management Agency Ohio Radiological Branch Chief
Enclosure L-24-263 30-Day Voluntary Report in Accordance with Industry Groundwater Protection Initiative
30-Day Voluntary Report in Accordance with Industry Groundwater Protection Initiative Description of Event On October 14, 2024 at the Perry Nuclear Power Plant (PNPP), manipulation of a lid upon a container holding radiological waste displaced radiologically contaminated water from the container. This container was in Perrys On-Site Storage Container (OSSC) outside yard, and the water spilled onto the ground. Subsequent research determined that, since January 2024, approximately 78.5 gallons of contaminated water had spilled to the ground.
Analysis also determined that the cobalt-60 and manganese-54 activity concentrations exceeded the sites 15 picoCuries/Liter voluntary reporting threshold that was established by the site procedure NOP-OP-4705, Response to Contaminated Spills/Leaks. In accordance with the NEI 07-07, Industry Groundwater Protection Initiative - Final Guidance Document revision 1 guidance, on October 29, 2024, PNPP reported to the required agencies, including the NRC, the local counties Emergency Management Agencies (EMAs), and the State of Ohio EMA Radiological Branch.
The following information is provided, consistent with the NEI reporting guidelines (Objective 2.3, Thirty-Day Reports):
- i.
A statement that the report is being submitted in support of the Groundwater Protection Initiative.
This voluntary special 30-day report is submitted in accordance with NEI 07-07, Industry Groundwater Protection Initiative - Final Guidance Document, revision 1.
ii.
A list of the contaminant(s) and the verified concentration(s).
An isotopic matrix of the spill source indicates these contaminants and concentrations:
manganese-54 at 2.52E-04 microCuries/milliliter (µCi/mL), and cobalt-60 at 1.91E-01 µCi/mL.
iii.
Description of the action(s) taken.
The radioactive storage container (source of the spill) was removed from the area and relocated to an on-site building to prevent impacts to the environment. Sampling has been performed to identify and quantify dose in the impacted area. A storm drain in the area has been covered to prevent migration into the storm water system. A sampling plan has been instituted for continued monitoring of an adjacent stream that was impacted by the spill. The station has solicited involvement of a third-party vendor, who specializes in spill recovery, to perform additional monitoring and cleanup activity.
iv.
An estimate of the potential or bounding annual dose to a member of the public.
The amount of spillage that occurred during this event was conservatively calculated to be 78.5 gallons with most of the spillage likely deposited in the immediate area of the OSSC yard. As a bounding calculation, while only a small fraction of the spillage is likely to have entered the environment and none has been detected beyond the site boundary, conservative calculations have been performed that show any dose at the site boundary would be a small fraction of site boundary limits. For calculation bounding purposes, conservatively assuming all spillage enters the environment and results in dose at the site boundary, the dose to the public would be nominally 1 mRem for the total body liquid dose and 1.5 mRem for liquid organ dose. As stated previously, the majority of contamination remained in the OSSC yard, and the actual dose to the public would be far below these conservative, bounding numbers.
- v.
Corrective action(s), if necessary, that will be taken to reduce the projected annual dose to a member of the public to less than the limits in 10 CFR 50 Appendix I.
The public has not received an annual dose above the allowable limits in 10 CFR 50 Appendix I.
Furthermore, corrective actions have, as stated in (iii) above, prevented further migration into the storm water system.