ENS 43503: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
||
| Line 17: | Line 17: | ||
| event date = 07/18/2007 12:20 EDT | | event date = 07/18/2007 12:20 EDT | ||
| last update date = 08/30/2007 | | last update date = 08/30/2007 | ||
| title = Unanalyzed Condition - Vent Space Less | | title = Unanalyzed Condition - Vent Space Less than Design Basis | ||
| event text = During an inspection of the Unit 2 Reactor Building Steam Chase as a result of a similar situation being previously discovered on Unit 1, a storage gangbox was noted to be resting on one of the two hinged blowoff panels in the floor of the Steam Chase (elevation 130') and the hinged blowoff panels were determined to be restrained which would prevent their opening. The blowoff panels are designed to open to provide pressure and temperature relief between the torus room and 130 ft elevation of the reactor building for high energy steam line breaks. The 'as found' configuration of the blowoff panels hinder their capability to open, which constitutes a non-conforming and unanalyzed condition in that the vent area between the torus room and main steam chase in the reactor building is less than the area assumed in the analysis for a HPCI steam line break. | | event text = During an inspection of the Unit 2 Reactor Building Steam Chase as a result of a similar situation being previously discovered on Unit 1, a storage gangbox was noted to be resting on one of the two hinged blowoff panels in the floor of the Steam Chase (elevation 130') and the hinged blowoff panels were determined to be restrained which would prevent their opening. The blowoff panels are designed to open to provide pressure and temperature relief between the torus room and 130 ft elevation of the reactor building for high energy steam line breaks. The 'as found' configuration of the blowoff panels hinder their capability to open, which constitutes a non-conforming and unanalyzed condition in that the vent area between the torus room and main steam chase in the reactor building is less than the area assumed in the analysis for a HPCI steam line break. | ||
As such, for a HPCl steam line break in the torus room, the short term pressure across the torus room ceiling would likely be greater than 2.3 psid, which is the maximum differential pressure stated in Chapter 15A of the Unit 2 FSAR. There is no known analyzed limit for the differential pressure between the torus room and the 130 ft elevation of the reactor building. The actual differential pressure given the 'as found' condition is not known at this time. | As such, for a HPCl steam line break in the torus room, the short term pressure across the torus room ceiling would likely be greater than 2.3 psid, which is the maximum differential pressure stated in Chapter 15A of the Unit 2 FSAR. There is no known analyzed limit for the differential pressure between the torus room and the 130 ft elevation of the reactor building. The actual differential pressure given the 'as found' condition is not known at this time. | ||
Latest revision as of 22:16, 1 March 2018
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+2.38 h0.0992 days <br />0.0142 weeks <br />0.00326 months <br />) | |
| Opened: | Steve Brunson 18:43 Jul 18, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Aug 30, 2007 |
| 43503 - NRC Website
| |
Hatch with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |