ML21181A403
| ML21181A403 | |
| Person / Time | |
|---|---|
| Site: | Purdue University |
| Issue date: | 06/29/2021 |
| From: | Miller T Purdue University Research Reactor, Indiana |
| To: | Joshua Borromeo, Cindy Montgomery, O'Bryan P, William Schuster Office of Nuclear Reactor Regulation, NRC/OCIO |
| montgomery, cynthia | |
| References | |
| Download: ML21181A403 (1) | |
Text
From:
True W Miller To:
O"Bryan, Phil; Montgomery, Cindy; Schuster, William; Borromeo, Joshua Cc:
Kim, Seungjin; Stylianos Chatzidakis; Storz, David L
Subject:
[External_Sender] NRC meeting summary Date:
Tuesday, June 29, 2021 4:34:48 PM Hello all, This email is to summarize the discussion we had earlier today.
Since February 28th, 2021 when operator Clive Townsend noticed that the rate of temperature change of the coolant was greater than expected, PUR-1 hasbeen shut down and remained shut down. Since then, multiple independent assessments on the reactor power have been performed, which include: Handcalculations, MCNP simulations, analysis on activity measurement of the irradiated materials, and a thermal-hydraulic analysis using a CFDmodel of PUR-1.As the final and more physical assessment, we are currently in preparation for experiments using resistance heaters as heat sources. The goalis to submerge the heaters inside the reactor pool andmeasure the corresponding coolant temperature change ratesat various heater power levels. Then, compare those with the data recorded onFebruary 28th. Therefore, upon completion of the heater experiments, together with other assessment results, we will be able to draw a reliable conclusion on the actual reactor condition and the potential need for a new gold-foil calibration correlation.
We anticipate the heater experiments to be completed before August, 2021.
In view of all of this, we will not be operating PUR-1 until wehave a good understanding of the reactor condition and have a plan to conservatively restart PUR-1 once the issue isunderstood.
True Miller Reactor Supervisor N.E. Radiation Laboratory Coordinator PurdueUniversity mill1833@purdue.edu office: 765-494-5764 cell: 317-460-9633