SUBJECT: BRAIDWOOD STATION, UNITS 1 AND 2; BYRON STATION, UNIT NOS. 1
Saturday, May 29, 2021
Exelon Fleet and The Associated Independent Spent Fuel Storage Installations - Extension of Comment Period for Notice of Consideration of Approval of Transfer of Licenses and Conforming Amendments and Opportunity to Request a Hearing
2021/05/24 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application (EPID L-2021-LLM-0000)
Subject: 2021/05/24 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application (EPID L-2021-LLM-0000)
Friday, May 21, 2021
Peach Bottom - UNUSUAL EVENT DUE TO A FIRE ALARM INSIDE THE DRYWELL
U.S. Nuclear Regulatory Commission
EVENT REPORTS FOR
05/17/2021 - 05/18/2021
|Power Reactor||Event Number: 55261|
|Facility: Peach Bottom|
Region: 1 State: PA
Unit:   
RX Type:  GE-4, GE-4
NRC Notified By: Brett Henry
HQ OPS Officer: Brian Lin
|Notification Date: 05/17/2021|
Notification Time: 13:12 [ET]
Event Date: 05/17/2021
Event Time: 12:38 [EDT]
Last Update Date: 05/17/2021
|Emergency Class: Unusual Event|
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared
GREIVES, JONATHAN (R1)
LEW, DAVE (R1 RA)
MILLER, CHRIS (NRR EO)
GRANT, JEFFERY (IR)
CASTELVETER, DAVID (PAO)
|Unit||SCRAM Code||RX Crit||Initial PWR||Initial RX Mode||Current PWR||Current RX Mode|
|2||N||Y||40||Power Operation||40||Power Operation|
UNUSUAL EVENT DUE TO A FIRE ALARM INSIDE THE DRYWELL
[Peach Bottom Atomic Power Station declared an unusual event due to a] "receipt of a single fire alarm in the Unit 2 drywell and the existence of the fire not verified in less than 30 minutes of alarm receipt."
The NRC Resident Inspector and State and Local Authorities were notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
* * * UPDATE ON 5/17/21 AT 1423 EDT FROM BRETT HENRY TO HOWIE CROUCH * * *
At 1355 EDT, the licensee terminated the notification of unusual event. The basis for termination was that the smoke has dissipated and there were no signs of fire.
The licensee notified State and Local Authorities and the NRC Resident Inspector.
Notified R1DO (Grieves), NRR EO (Miller), and IRD MOC (Grant). Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), FEMA NRCC THD (email) and FEMA NRCC SASC (email).
Sunday, May 16, 2021
NRC Public Workshop - Technical Basis for Guidance on Conducting and Evaluating Surveys of Residual Radioactivity in the Subsurface Soils of Licensee Sites
This will be a virtual-only meeting and attendance will be via Microsoft Teams (links to be provided at a later date). Detailed webinar information and other meeting details will be posted to the public meeting notice website: https://www.nrc.gov/pmns/mtg?do=details&Code=20210553
The agenda is still being developed. The current plan is to have a mix of pre-recorded presentations and open discussions. Parties interested in presenting should contact the NRC meeting organizers.
The purpose of this workshop is to gather information on the subject areas below. Discussion topics to be covered during this workshop may include:
1. Subsurface radiological surveys ranging from historical site assessments, scoping, characterization, remedial action, confirmatory, and final status surveys.
2. DCGLs for contaminants in the subsurface and use of multiple DCGLs for surface and/or subsurface layers. Evaluating elevated areas or hot spots (DCGLEMC) for potential doses to receptors including the inadvertent intruder.
3. Evaluation of sites with geospatial and statistical methods.
· Statistical methods and geospatial modeling tools and software to analyze contaminant distributions and optimize sampling and scanning of the sub-surface.
· Methods to determine the sample density, spatial distributions, depths, and volume to achieve a level of confidence and limit decision errors.
· Applicability of MARSSIM statistical tests and other alternative methods.
Treatment of uncertainty and data sufficiency.
Applicability of “composite sampling” or surrogate ratios.
4. Applicability of Scenario B for subsurface residual radioactivity and demonstrating indistinguishability from background.
5. Methods to survey large subsurface soil excavations and survey of soils for reuse in large excavations including use of conveyor belts and other methods.
The executive summary to a draft Technical Letter Report by SC&A (see link below) outlines some key issues related to sub-surface characterization and surveys for decommissioning, and in some cases suggests approaches to resolving those concerns. Attendees are strongly encouraged to have read or be familiar with the nomenclature and procedures of the MARSSIM document, as analogous terminology and many of the same concepts may be useful for subsurface surveys as well. This is already reflected in the discussion topics listed above, in NUREG/CR 7021, and the SC&A executive summary.
Executive Summary, “Guidance on Surveys for Subsurface Radiological Contaminants,” Draft Technical Letter Report,” SC&A April 2021. ML21123A229
NUREG-1575, “Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM),” Revision 1, issued August 2000 (NRC 2000). MARSSIM Rev. 2 is soon to be issued for public comment but is available for early download at the EPA’s Science Advisory Board website: https://yosemite.epa.gov/sab/sabproduct.nsf/RSSRecentAdditionsBOARD/E1D35FEB397932FF8525854D00836CFA
NUREG/CR 7021, “A Subsurface Decision Model for Supporting Environmental Compliance,” issued January 2012.
Nuclear Regulatory Commission
Office of Nuclear Material Safety and Safeguards
Division of Decommissionning, Uranium Recovery,
and Waste Programs