ML20151W463
| ML20151W463 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 08/12/1988 |
| From: | GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20151U204 | List: |
| References | |
| NUDOCS 8808240360 | |
| Download: ML20151W463 (1) | |
Text
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3/4.9 RE, FUELING OPERATIONS BASES 3/4.9.1 BORON CONCENTRATION The limitations on reactivity conditions during REFUELING ensure that:
(1) the reactor will remain subcritical during CORE ALTERATIONS, and (2) a uniform boron concentration is maintained for reactivity control in the water volume having direct access to the reactor vessel.
The locking closed of the required valves during refueling operations precludes the possibility of uncontrolled boron dilution of the filled portions of the Reactor Coolant System.
This action prevents flow to the RCS of unborated water by closing flowpaths from sources of unborated water.
These limitations are consistent with the initial conditions assumed for the Boron Oilution Accident in the safety analysis.
The boron concentration value of 2000 ppm or greater ensures aKef t of 0.95 or less and includes a conservative allowance for calculational
-uccertaintics>' uncertaarty of /00pm berm.
3/4.9.2 INSTRUMENTATION The OPERABILITY of the Source Range Neutron Flux Monitors ensures that redundant monitoring capability is available to detect changes in the reactivity condition of the core.
3/4.9.3 DECAY TIME The minimum requirement for reactor subcriticality prior to movement of irradiated fuel assemblies in the reactor vessel ensures that sufficient time has elapsed to allow the radioactive decay of the short-lived fission products.
This decay time is consistent with the assumptions used in the safety analyses.
3/4.9.4 CONTAINMENT BUILDING PENETRATIONS The requirements on containment building penetration closure and OPERABILITY ensure that a release of radioactive material within containment will be restricted from leakage to the environment.
The.0PERABILITY and closure restrictions are sufficient to restrict radioactive material release from a fuel element rupture based upon the lack of containment pressurization potential while in the REFUELING MODE.
3/4.9.5 COMMUNICATIONS The requirement for communications capability ensures that refueling station personnel can be promptly informed of significant changes in the f acility status or core reactivity conditions during CORE ALTERATIONS.
02%h P
V0GlLE - UNIT 1 83/49-1 Proposed TS/02214/131