ENS 52980
ENS Event | |
|---|---|
19:49 Sep 19, 2017 | |
| Title | Reactor Bay Ventilation Inoperable |
| Event Description | The following was received via email:
The exhaust plenum monitor (EPM) was sent out for calibration a couple of weeks ago. It was received back on September 17, 2017, and returned to service. [On 9/20/17,] one of the senior reactor operators noticed that the noble gas detector was not responding properly. It was turned off. A relay on the EPM controls reactor bay ventilation, which is required to be operable per Technical Specifications. If the EPM alarms, ventilation is turned off. This relay was rewired to use only the two operating EPM detectors. Despite this, the reactor bay ventilation was observed to not operate as expected. The problem was traced back to a separate faulty relay, which was subsequently bypassed. The senior reactor operator had access to a control room breaker, and planned to manually cut power to the ventilation system if the EPM or continuous air monitor alarmed. An experiment was installed that has the potential to release radioactive gases; the reactor was started up at 1449 CDT and shut down at 1743 CDT. No increases in radiation levels were observed during or after operations. The ventilation system was operating during reactor operations. As previously mentioned, reactor bay ventilation is required to be operable per Technical Specifications. Operable is defined as being capable of performing it's intended function in a normal manner. Manually cutting power to the ventilation system via control room breaker is not considered normal operation for the ventilation system. According to Technical Specifications, the reactor may be operated with the ventilation system inoperable, but reactor experiment operations with the potential to release radioactive gases or aerosols must be secured. While the apparatus was secured according to the definition in Section 1 of the Technical Specifications, the experiment was still performed, and so experiment operations were not secured in accordance with the Limiting Condition of Operation. |
| Where | |
|---|---|
| Kansas State University Manhattan, Kansas (NRC Region 0) | |
| License number: | R-88 |
| Reporting | |
| Non | |
| Time - Person (Reporting Time:+17.4 h0.725 days <br />0.104 weeks <br />0.0238 months <br />) | |
| Opened: | Amir Bahadori 13:13 Sep 20, 2017 |
| NRC Officer: | Steven Vitto |
| Last Updated: | Sep 20, 2017 |
| 52980 - NRC Website
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Kansas State University with Non | |
WEEKMONTHYEARENS 544212019-12-05T00:00:0005 December 2019 00:00:00
[Table view]Non Annual Surveillance Not Completed ENS 538052018-12-22T06:00:00022 December 2018 06:00:00 Non Surveillance Not Done Due to Inadequate Procedure ENS 529802017-09-19T19:49:00019 September 2017 19:49:00 Non Reactor Bay Ventilation Inoperable ENS 491172013-06-13T20:39:00013 June 2013 20:39:00 Non Failure of In-Core Thermocouple ENS 462832010-09-22T12:40:00022 September 2010 12:40:00 Non Unexpected Changes in Restricted Area Dose Rates 2019-12-05T00:00:00 | |