ML23136A605
| ML23136A605 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/12/2023 |
| From: | Scott W Constellation Nuclear |
| To: | Scott Rutenkroger NRC Region 1 |
| References | |
| Download: ML23136A605 (1) | |
Text
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To be successful, reactor pressure must be controlled following the initial transient without the use of Safety Relief Valves (SRVs).
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Automatic cycling of the SRV(s) that may have occurred as a result of the initial transient would result in a No response, but automatic cycling of the SRV(s) subsequent to the initial transient would result in a Yes response.
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Additionally, the SRV(s) cannot fail open.
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The failure of the pressure control system (i.e. turbine valves / turbine bypass valves / HPCI /
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If operating prior to the scram, did Main Feedwater cease to operate and was it unable to be restarted during the reactor scram response? The consideration for this question is whether Main Feedwater could be used to feed the reactor vessel if necessary. The qualifier of not recoverable using approved plant procedures will allow a licensee to answer NO to this question if there is no physical equipment restraint to prevent the operations staff from starting the necessary equipment, aligning the required systems, or satisfying required logic circuitry using plant procedures approved for use that were in place prior to the scram occurring.
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The operations staff must be able to start and operate the required equipment using normal alignments and approved emergency, normal and off-normal operating procedures. Manual operation of controllers/equipment, even if normally automatic, is allowed if addressed by procedure. Situations that require maintenance or repair activities or non-proceduralized operating alignments will not satisfy this question.
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Additionally, the restoration of Main Feedwater must be capable of being restored to provide feedwater to the reactor vessel in a reasonable period of time. Operations should be able to start a Main Feedwater pump and start feeding the reactor vessel with the Main Feedwater System within about 30 minutes from the time it was recognized that Main Feedwater was needed.
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