ML19329B577
| ML19329B577 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/20/1977 |
| From: | Batch S, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B498 | List: |
| References | |
| NUDOCS 8002050712 | |
| Download: ML19329B577 (2) | |
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@l The Reactor Protection System (RPS) had been placed in shutcioun bypass t
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DAVIS-BESSE UNIT ONE NUCLEAR POLTER STATION
- SUPPLEMENTAL INFORMATION FOR LER NP-33-r-8_
DATE OF EVENT: May 20, 1977
- FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: The Reactor Protection System (RPS) high flux set-
' point was discovered to be set at 3.5% of ra'ted thermal power while in shutdown bypass in' violation of Technical Specification 2.2.1.
Conditions Prior to Occurrence: The plant was in Mode 5.
Power:
MWT-0, MWE-0 Description of Occurrence: The RPS had been placed in shutdown bypass during the cooldown after Hot Functional Testing.
The high flux setpoint was not reset to
$! 5% at this time in order to facilitate RPS and Nuclear Instrumentation Pre-Operational Testing. This violated Tc'chnical Specification 2.2.1 after Fuel Load.
Designation of Apparent Cause of Occurrence: The high flux setpoint was inadver-
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tently neglected to be reset prior to initial Fuel Load as a result of a personnel
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Analysis of Occurrences:
Since all of the cont.rol rod drive breakers were open (all rods fully inserted) and the RPS tripped, the RPS was in a safe condition; creating no health or safety hazard to the public or station personnel.
Corrective Action: The RPS was returned to normal status and further similar occurrences will be avoided since the shutdown procedure requires we lower the flux setpoint to SES%.
Failure Data:
No previous similar events have occurred.
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