ENS 55359

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v t e ENS Event
20:00 Feb 28, 2021
Title	Reactor Operated at Greater than 100 Percent Technical Specification Power Limit
Event Description	On February 28, 2021, [at approximately 1500 EST], following recalibration of the reactor power in accordance with PUR-1 Technical Specifications, the reactor operator operated the reactor at 8.5 kW (85% of nominal power) and noticed that the rate of temperature change of the coolant was greater than expected. Noting that this presents the possibility of the power being in excess of expectations, PUR-1 was shut down and has remained shut down to date. PUR-1 staff immediately notified the Committee on Reactor Operations (CORO) and developed a plan to perform an in-depth investigation. Since then, multiple independent assessments on the reactor power have been performed, which include: Hand calculations, Monte Carlo N-Particle code (MCNP) simulations, analysis on activity measurements of irradiated materials, a thermal-hydraulic analysis using a Computational Fluid Dynamic (CFD) model of PUR-1, and a more physical assessment using resistance heaters as heat sources to determine the coolant temperature change rate as a function of power and pool temperature, which has just been completed. These five independent evaluation methods performed to determine the core power during the experiment on February 28, 2021, suggest that the reactor may have been operated for about 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> at a power in the range between 118.3 percent to 129.2 percent of our 12 kW maximum allowable power (per TS 2.2). While the reactor was not operated outside the bounds of the Safety Analysis Report (SAR), this represents a potential need for reporting under TS 6.7.b.1.c.vi, 'An observed inadequacy in the implementation of procedural controls...'. Staff are currently evaluating several potential corrective actions including adjustment of the current power calibration constant, which relates the activity of the gold foil to the core power, by the most conservative factor suggested by these five analyses. There was no impact to the safety of the public or PUR-1 staff and the Safety Limit was not exceeded at any point. A formal report will be subsequently issued.

ENS 55359 +/-
Where
Purdue University West Lafayette, Indiana (NRC Region 0)
License number:	R-87
Reporting

Non
Time - Person (Reporting Time:+3378.78 h140.783 days <br />20.112 weeks <br />4.628 months <br />)
Opened:	True Miller 13:47 Jul 19, 2021
NRC Officer:	Donald Norwood
Last Updated:	Jul 19, 2021
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v t e Emergency Notification System
Purdue University with Non
WEEKMONTHYEAR2021-02-28T20:00:00 [Table view]
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