ENS 54507
ENS Event | |
|---|---|
16:50 Feb 1, 2020 | |
| Title | |
| Event Description | EN Revision Imported Date : 3/17/2020
LOW PRESSURE CORE SPRAY INOPERABLE At 1150 EST on 2/1/2020, it was discovered that the Low Pressure Core Spray System was inoperable due to a divisional battery voltage being out-of-specification. Therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). The Low Pressure Core Spray is a single train safety system in Modes 1, 2, and 3. Low Pressure Core Spray was restored to operable, restoring function at 1230 on 2/1/2020. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.
On February 01, 2020, event notification (EN-54507) was made to the NRC for Low Pressure Core Spray (LPCS) inoperability. This notification was made due to high DC bus voltages resulting in LPCS being declared inoperable which resulted in a loss of safety function. An Engineering Evaluation Request (EER) was performed to determine an upper limit for DC bus voltage. This EER determined that LPCS could perform its required functions with a voltage increase of up to 150V DC if the duration was not greater than two hours. The elevated voltage was experienced for approximately 59 minutes. The maximum voltage experienced was 147.07V DC. Therefore, LPCS remained operable and no loss of safety function existed. The NRC Resident Inspector has been briefed on the evaluation results and informed of this retraction. Notified R3DO (Hanna). |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.35 h-0.0146 days <br />-0.00208 weeks <br />-4.7943e-4 months <br />) | |
| Opened: | Clifford Jones 16:29 Feb 1, 2020 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Mar 16, 2020 |
| 54507 - NRC Website
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