ML19317F474
| ML19317F474 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/11/1973 |
| From: | US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19317F468 | List: |
| References | |
| NUDOCS 8001140705 | |
| Download: ML19317F474 (2) | |
Text
- .,.
f OCONEE 2 & 3 DOCKET NO. 50-270/287 SUPPLEMENT TO Tile FINAL SAFETY EVALUATION MECllANICAL ENGINEERING BRANCH ACTIVE VALVE OPERABILITY ASSURANCE Active valves whose operation. is relied upon to safely shutdown and maintain the plant in a safe condition in the unlikely event of a safe shutdown earthquake or a loss-of-coolant accident must be designed and tested to criteria which assure that these components will function properly during and after all design basis events.
The applicant has identified the active valves within the reactor coolant pressure boundary and listed the applicable design and operation conditions.
Seismic analyses for the specific piping systems in which these valves are located were performed to determine the severity of seismic loads.
Vibration testing was utilized to confirm the capability of certain valve operators to sustain dynamic loading.
Environmental tests, including heat, steam, and chemical effects, were conducted in some instances on complete valve assemblies and most significantly, on all appropriate electric motor operators.
In addition, hydrostatic testing, leak testing, and perfornance cyclic testing was also conducted. We find.that the design and test programs utilized provide acceptable assurance that.the active valves identified are inherently capable of performing their design safety functions under the mechanical loads and environmental conditions associated with the design basis events
- for Oconee Units 2 and 3.
The applicant has further agreed to remain cognizant of industry efforts to identify potential valve operability s
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a generic problems and to incorporate, if necessary, appropriate raodificat. cas that could iciprove or correct active valve performance under conditions required for their intended design safety function.
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