ENS 43369: Difference between revisions
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| event date = 05/17/2007 12:30 EDT | | event date = 05/17/2007 12:30 EDT | ||
| last update date = 06/26/2007 | | last update date = 06/26/2007 | ||
| title = Degraded Condition - Degradation | | title = Degraded Condition - Degradation of Principal Safety Barrier | ||
| event text = Under 10CFR50.72 (b)(3)(ii)(A), the following event has been determined to be reportable. This section concerns the condition of the nuclear power plant, including its principal safety barriers, being seriously degraded. This criteria was determined to apply to material problems that cause abnormal degradation of or stress upon a principal safety barrier (in this case, Reactor Coolant System). | | event text = Under 10CFR50.72 (b)(3)(ii)(A), the following event has been determined to be reportable. This section concerns the condition of the nuclear power plant, including its principal safety barriers, being seriously degraded. This criteria was determined to apply to material problems that cause abnormal degradation of or stress upon a principal safety barrier (in this case, Reactor Coolant System). | ||
On 5/17/07, a Nine Mile Point Unit 1 shutdown was in progress for forced outage inspection and repairs of the Turbine Lube Oil system. Prior to the shutdown, a discrepancy was being experienced between Reactor level readings from channel 11 and 12 Reactor Level columns. A step change increase of 2 inches of Reactor level had occurred on May 6th, 2007 on Reactor Level column 12. This change was coincident with an increase of 18 [degrees] F of the reference leg and 2 [degrees] F decrease of the variable leg. The level difference was then 5 inches with a Technical Specification limit of 6 inches based on current Drywell temperature. The condition was documented in the Corrective Action Program, compensatory actions were taken, and an Integrated Response Team was formed to investigate and determine the cause. Calculations by engineering determined a leak of 4 drops per minute could explain the observed indications. | On 5/17/07, a Nine Mile Point Unit 1 shutdown was in progress for forced outage inspection and repairs of the Turbine Lube Oil system. Prior to the shutdown, a discrepancy was being experienced between Reactor level readings from channel 11 and 12 Reactor Level columns. A step change increase of 2 inches of Reactor level had occurred on May 6th, 2007 on Reactor Level column 12. This change was coincident with an increase of 18 [degrees] F of the reference leg and 2 [degrees] F decrease of the variable leg. The level difference was then 5 inches with a Technical Specification limit of 6 inches based on current Drywell temperature. The condition was documented in the Corrective Action Program, compensatory actions were taken, and an Integrated Response Team was formed to investigate and determine the cause. Calculations by engineering determined a leak of 4 drops per minute could explain the observed indications. |
Latest revision as of 22:16, 1 March 2018
Where | |
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Nine Mile Point New York (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
Time - Person (Reporting Time:+3.88 h0.162 days <br />0.0231 weeks <br />0.00531 months <br />) | |
Opened: | Matthew Minnick 20:23 May 17, 2007 |
NRC Officer: | Gerry Waig |
Last Updated: | Jun 26, 2007 |
43369 - NRC Website
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