ML19329B928
| ML19329B928 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 05/10/1977 |
| From: | Batch S, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B920 | List: |
| References | |
| NUDOCS 8002060913 | |
| Download: ML19329B928 (2) | |
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. SUPPLEMENTAL INFORMATION FOR LER NP-32-77.1 DATE OF EVENT: April 28, 1977 FACILITY:
Davis-Besse Unit i d
e IDENTIFICATION OF OCCURRENCE:
Installing incere detectors in violation of Technical Specifications 3.9.2, 3.9.5 and 6.2.2e.
Incore instrumentation was being installed without the direct supervision of a Senior Reactor Operator licensed person: there was no com=unication between Control Room and personnel at the refueling station; no audible source range indication in Containment and Control Room.
Conditions Prior to Occurrence: The plant was in Mode 6 with the Reactor Vessel i
Head off.
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Description of Occurrence: At 0830 on April 28, 1977, began installing incore I
instrumentation.
After the nineteenth incore detector was installed at 1035, it was recognized this action was in violation of Technical Specifications.
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The work was i=cediately suspended and a meeting of the Station Review Board was called to review the event.
Designation of Apparent Cause of Occurrence: This event has been determined to have been caused by procedure inadequacy in IC 2001.04, "Incore Detector Handling" and Replacement".
Analysis of Occurrence: The effect on reactivity coefficient of inserting the incore detectors into the initial core is insignificant.
It is therefore con-cluded that the event.did not result in a threat to the health and safety of the public or to station personnel.
Corrective Action: A modification was made to the procedure to meet the Technical Specifications and allow the work to continue.
Failure Data: No previous similar events have occurred.
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DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-1 DATE OF EVENT:
April 28, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:
Installing incore detectors in violation of Technical Specifications 3.9.2, 3.9.5 and 6.2.2e.
Incore instrumentation was being installed without the direct supervision of a Senior Reactor Operator licensed person; there was no communication between Control Room and personnel at the refueling station; no audible source range indication in Containment and Control Room.
Conditions Prior to Occurrence: The plant was in Mode 6 with the Reactor Vessel Head off.
Description of Occurrence: At 0830 on April 28, 1977, began installing incore instrumentation. Af ter the nineteenth incore detector was installed at 1035, it was recognized this action was in violation of Technical Specifications.
O The work was immediately suspended and a meeting of the Station Review Board t
1 was called to review the event.
V Designation of Apparent Cause of Occurrence: This event has been determined to have been caused by proc 2 dure inadequacy in IC 2001.04, "Incore Detector Handling" and Replacement".
Analysis of Occurrence: The effect on reactivity coefficient of inserting the incore detectors into the initial core is insignificant.
It is therefore con-cluded that the event did not result in a threat to the health aid safety of the public or to station personnel.
Corrective Action: A modification was made to the procedure to meet the Technical Specifications and allow the work to continue.
3 Failure Data:
No previous similar events have occurred.
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