The High Pressure Coolant Injection (HPCI)
System |
|---|
|
|
| | Site | Start date | Title | Description |
|---|
| ENS 57444 | Perry | 26 November 2024 16:58:00 | Division 3 Diesel Generator Inoperable | The following information was provided by the licensee via phone and email:
At 1158 EST on 11/26/24, the Division 3 diesel generator was declared inoperable due to failure of the right bank air start motor during a planned monthly surveillance run. Troubleshooting of the issue is in progress. This condition could prevent the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). All other emergency core cooling systems were operable during this time.
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The Division 3 diesel generator supports high pressure core spray, a single train system. | | IR 05000416/2024003 | Grand Gulf | 6 November 2024 | Integrated Inspection Report 05000416/2024003 | | | IR 05000373/2024003 | LaSalle | 6 November 2024 | County Station - Integrated Inspection Report 05000373/2024003 and 05000374/2024003 | | | IR 05000458/2024003 | River Bend | 31 October 2024 | Integrated Inspection Report 05000458/2024003 | | | IR 05000440/2024003 | Perry
07200069 | 30 October 2024 | Integrated Inspection Report 05000440/2024003 and 07200069/2024001 | | | ENS 57406 | Perry | 29 October 2024 15:52:00 | Inoperability of Division 3 Diesel Generator Supporting High Pressure Core Spray | The following information was provided by the licensee via phone and email:
At 1152 EDT, on 10/29/2024, the division 3 diesel generator was declared inoperable due to variations in steady state voltage during a planned monthly surveillance run. Troubleshooting of the issue is in progress. This condition could prevent the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). All other emergency core cooling systems were operable during this time.
There was no impact on the health and safety of the public or plant personnel. The NRC resident inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
Limiting condition for operations (LCO) 3.8.1.b was entered as a result of this event. | | ML24290A114 | Columbia | 17 October 2024 | CGS FPTI 2024011 | | | L-24-208, License Renewal Application for the Perry Nuclear Power Plant - Responses to Request for Additional Information - Round 1 (Set 2) | Perry | 2 October 2024 | License Renewal Application for the Perry Nuclear Power Plant - Responses to Request for Additional Information - Round 1 (Set 2) | | | ENS 57349 | Grand Gulf | 27 September 2024 23:22:00 | High Pressure Core Spray Injection Inoperable | The following information was provided by the licensee via phone and email:
At 1822 CST on September 27, 2024, Grand Gulf Nuclear Station (GGNS) was conducting surveillance testing on the high pressure core spray (HPCS) division Ill diesel generator. Following initiation of the test signal, the HPCS pump room cooler start time exceeded the surveillance procedure allowance of less than or equal to 20 seconds. The HPCS pump room cooler started in 26.2 seconds. HPCS was already inoperable for performance of the surveillance testing.
The event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as an event or condition which could have prevented the fulfillment of a safety function.
Troubleshooting is in progress. HPCS, a single-train system, will remain inoperable until the condition is corrected.
All sources of offsite power are available. No other safety systems are inoperable. Reactor core isolation cooling was verified to be operable per GGNS technical specification 3.5.1.B.1.
The NRC Senior Resident Inspector has been notified.
- * * RETRACTION ON 11/25/2024 AT 1333 EST FROM JEFF HARDY TO IAN HOWARD * * *
Investigation of the delayed start time of the HPCS pump room cooler indicated that the condition would not have challenged the ability of the room cooler to maintain temperatures less than the temperature limit of 150 degrees Fahrenheit. As a result, HPCS remained capable of fulfilling its safety function. Therefore, EN 57349 is being retracted.
The NRC senior resident inspector has been notified of this retraction.
Notified R4DO (O'Keefe) | | ENS 57338 | Grand Gulf | 25 September 2024 03:04:00 | High Pressure Core Spray Inoperable | The following information was provided by the licensee via phone or email:
On September 24, 2024, at 2204 CDT, Grand Gulf Nuclear Station (GGNS) was conducting surveillance testing on the high pressure core spray (HPCS) division III diesel generator. During testing, the HPCS pump breaker unexpectedly tripped after the HPCS diesel generator started and powered the safety bus. The breaker performed its motor protection function and tripped due to an over-frequency indication.
The event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as an event or condition which could have prevented the fulfillment of a safety function.
Troubleshooting is in progress. HPCS, a single-train system, will remain inoperable until the condition is corrected.
All sources of offsite power are available. No other safety systems are inoperable. Reactor core isolation cooling was verified to be operable per GGNS Technical Specification 3.5.1.B.1.
The NRC Senior Resident has been notified. |
|