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Search Publications by: Dagistan Sahin (Fed)

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Displaying 1 - 25 of 59

NIST Neutron Source Pre-Conceptual Design

February 10, 2025
Author(s)
David Diamond, Abdullah Weiss, Osman Celikten, Jeremy Cook, Dagistan Sahin, Hubert King, Anil Gurgen, Joy Shen
A pre-conceptual design has been completed for a NIST Neutron Source (NNS). It would replace the existing facility at the NIST Center for Neutron Research (NCNR) to enable significantly more thermal and cold neutrons to be used in many more experiments

Calibration of a gamma ray Compton camera for radioactivity measurements

September 10, 2024
Author(s)
Heather H. Chen-Mayer, Dagistan Sahin, Bryan Remley, Steven Brown, David Goodman
A dual-plane Compton imaging detector previously developed for prompt gamma imaging has been further tested and calibrated for quantitative radioactivity determination, specifically to assess radioactive debris from a reactor fuel element containing

Alternative Reflectors for The NIST Neutron Source

June 18, 2023
Author(s)
Yaniv Shaposhnik, Osman Celikten, Jeremy Cook, Abdullah Weiss, Dagistan Sahin
A conceptual design of a replacement reactor at the NIST Center for Neutron Research (NCNR), referred to as the NIST Neutron Source (NNS), is underway in collaboration with the Brookhaven National Laboratory. The NNS reactor design favors the production of

Lessons Learned on NBSR Licensing Actions

June 18, 2023
Author(s)
Dagistan Sahin, Thomas H. Newton, Steven Dewey, Osman Celikten, Paul C. Brand, Lap-Yan Cheng
After the incident in February 2021, NBSR implemented three license amendment requests (LAR) to allow the restart of the reactor. The first LAR was to modify previous latch verification requirements in the Technical Specifications (TS). Originally TS

Quantifying Reactor Power Noise - A Case Study on NIST Research Reactor

May 26, 2023
Author(s)
Anil Gurgen, Dagistan Sahin, James R. Whipple
Water cooled reactors experience reactivity changes when voids are present in the coolant. The fraction of coolant in the core diminutions in the event of boiling, and the reactivity feedback can either be positive due to reducing neutron absorption in the

Radiation Monitoring System Upgrade for the NBSR

May 25, 2023
Author(s)
James R. Whipple, Dagistan Sahin, Yehonatan Zino
The Radiation Monitoring System (RMS) at the NIST Center for Neutron Research (NCNR) Reactor (National Bureau of Standards Reactor – NBSR) has demonstrated reliability issues due to outdated hardware and lack of vendor support. The existing radiation

Modeling Approach for the Design of the NIST Neutron Source

April 16, 2023
Author(s)
Abdullah Weiss, Osman Celikten, Anil Gurgen, Joy Shen, Dagistan Sahin, Yaniv Shaposhnik
The NIST Neutron Source, or NNS, is a proposed new research reactor at the NIST Center for Neutron Research to replace the currently operational, but aging, National Bureau of Standards Reactor (NBSR). The NNS is currently in the pre-conceptual design

Pre-Conceptual Design of the NIST Neutron Source

April 16, 2023
Author(s)
Dagistan Sahin, Osman Celikten, Jeremy Cook, Abdullah Weiss, Thomas Newton, David Diamond, Charles F. Majkrzak, Hubert King, Joy Shen, Anil Gurgen, Lap-Yan Cheng, Peter Kohut, Cihang Lu, Athi Varuttamaseni
The National Bureau of Standards Reactor (NBSR), a 20 MW thermal power Material Test Reactor (MTR), is located at the NIST Center for Neutron Research (NCNR), providing a safe and reliable neutron source for the thousands of visiting U.S. and international

The Statistic and Deterministic Kettle

April 16, 2023
Author(s)
Yaniv Shaposhnik, Abdullah Weiss, Dagistan Sahin
In some accident scenarios, a nuclear reactor could be assumed to be similar to a kettle. Namely, the water inside the core, or in this case in the kettle, is experiencing heating, and at some point, for a non-boiling reactor, the safety boundary may be

Proposed NIST Neutron Source User Facility

November 1, 2022
Author(s)
Jeremy Cook, Hubert King, Charles F. Majkrzak, Dagistan Sahin, Joy Shen, Osman Celikten, David Diamond, Robert E. Williams, Thomas Newton
ANS summary format (no abstract)