ML19317F331
| ML19317F331 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/22/1972 |
| From: | Schwencer A US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8001100706 | |
| Download: ML19317F331 (2) | |
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I Note to Files OCONEE NUCLEAR POWER STATION - USE OF FLOW LIMITERS On December 20, 1972 Duke Power Company notified me of their decision to install flow limiters in the core flood nozzles of the reactor pressure vessel for all three Oconee Units. This decision was based by their nuclesr-steam supplier, B&W, and their conviction on advice that'it would improve system performance by leaving more water in the reactor vessel dn the early stages of reflood following a postulated break in the core flood line, i
The use of flow Jimiters had been presented as a possibility to the staff at a meeting earlier this month. B&W and Duke indicated that they have completed the design work necessary and plan to proceed I-with installation of these flow limiters as soon after cool down on Oconee Unit 1.
The cool down from the hot functional test is i
expected to start December 27, 1972 and renoval of the core aternals will probably take on the order of one week, therefore, installation is projected for the first or second week of January.
I indicated that preliminary discussions with staff personnel have suggested certain technical data that we will require in order to complete a review of this design modification.
In particular, i-information should be available describing the flow limiter, its composition, means of attachment inside the core flood nozzles, method of NDT inspection, analyses showing that resultant stresses to the reactor pressure vessel due to this
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modification will be acceptable comnitment to perform a new core i
flood test demonstrating performance using these flow limiters.
Appropriate accident analysis data to assure tht.t for the spectrum of breaks the resulting change in performance due to these flow limiters is acceptable.
It was' requested that they immediately proceed to gather this information and that we would contact them as soon as possible in the event i
-that additional data will.be requested for our review. The applicant 4
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stated that they would be prepared to meet with us to present this i
information orally as soon as the information can be gathered and a meeting date established.
1 In regard to impact on fuel loading, the applicant indicated even with installation of the flow limiters they are still scheduled to l
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-2 be ready for fuel loading January 26, 1972. As of December 20, 1972, they were five days ahead of schedule which would indicate that fuel loading would be a possibility by January 21, 1972.
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e 06'cAdudsL A. Schwencer, Chief Pressurized Water Reactors Branch No. 4 Directorate of Licensing cc: IAPeltier RCDeYoung
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