ML18353B231: Difference between revisions
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{{#Wiki_filter:I * | {{#Wiki_filter:I ~ | ||
--. | consumers | ||
* Area Code 517 788-0550 Division of Reactor Licensing | * . . | ||
Re: Docket 50-255 License DPR-20 Palisades Plant UE-75-2 Attached is Unusual Event Report UE-75-2 which covers the failure of Control Rod No 30 to drop properly. | /:0j :~:.. ~-t~. -- . | ||
This failure occurred during testing with the plant in hot shutdown and there was no effect on plant operation. | ~ | ||
The Palisades Technical Specifications permit plant operation with an inoperable control rod. Very truly yours, DAB/ce Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC | Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201 | ||
* * | * Area Code 517 788-0550 Division of Reactor Licensing Re: Docket 50-255 US Nuclear Regulatory.Commission License DPR-20 Washington, DC 20555 Palisades Plant UE-75-2 Gentlemen: | ||
* Attached is Unusual Event Report UE-75-2 which covers the failure of Control Rod No 30 to drop properly. This failure occurred during testing with the plant in hot shutdown and there was no effect on plant operation. | |||
Palisades Plant, Covert, Michigan 4. Identification of Occurrence: | The Palisades Technical Specifications permit plant operation with an inoperable control rod. | ||
Control Rod No 30 failed to drop properly during rod drop timing test. 5. Conditions Prior to Occurrence: | Very truly yours, DAB/ce Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC | ||
The reactor was in the hot shutdown condition. | * | ||
: 6. Description of Occurrence: | * 1. Report No: | ||
On March 29, 1975 CRDM torque and control rod drop testing was being conducted. | UNUSUAL EVENT REPORT Palisades Plant UE-75-2, Docket 50-255 2a. Report Date: April 1, 1975 2b. Occurrence Date: March 29, 1975 | ||
During the testing, Control Rod No 30 failed to drop properly when the clutch switch was opened. Successive testing showed rough operation coupled with slow or incomplete rod drops. 7. Apparent Cause of Occurrence: | : 3. Facility: Palisades Plant, Covert, Michigan | ||
An apparent cause of the event has not been termined. | : 4. Identification of Occurrence: Control Rod No 30 failed to drop properly during rod drop timing test. | ||
Further investigation will be conducted at the next cold shutdown | : 5. Conditions Prior to Occurrence: The reactor was in the hot shutdown condition. | ||
: 6. Description of Occurrence: On March 29, 1975 CRDM torque and control rod drop testing was being conducted. During the testing, Control Rod No 30 failed to drop properly when the clutch switch was opened. Successive testing showed rough operation coupled with slow or incomplete rod drops. | |||
PRC review of the incident concluded that plant tion can continue per Technical Specifications Section 3.10.4.b. | : 7. Apparent Cause of Occurrence: An apparent cause of the event has not been de- | ||
The control rod is mechanically operable but is classified as "inoperable" because it not be satisfactorily tripped. 9. Corrective Action: The following corrective action was taken or will be taken: a. It was recommended that this control rod not be further exercised or ated unnecessarily and so noted in daily orders in shift supervisor's office. b. Continue the investigation into the cause of the malfunction. | * termined. Further investigation will be conducted at the next cold shutdown * | ||
Engineering assistance is to be provided to follow up on the repair of the drive unit. 10. Failure Data: a. There is no record of any previous malfunctions of this type on any of the CRDMs. b. Control Rod Drive No 30 manufacturer is Combustion Engineering, Inc and the piece number is J-2966-163-001 | : 8. Analysis of Occurrence: PRC review of the incident concluded that plant opera-tion can continue per Technical Specifications Section 3.10.4.b. The control rod is mechanically operable but is classified as "inoperable" because it can-not be satisfactorily tripped. | ||
: 9. Corrective Action: The following corrective action was taken or will be taken: | |||
: a. It was recommended that this control rod not be further exercised or oper-ated unnecessarily and so noted in daily orders in shift supervisor's office. | |||
: b. Continue the investigation into the cause of the malfunction. Engineering assistance is to be provided to follow up on the repair of the drive unit. | |||
: 10. Failure Data: | |||
: a. There is no record of any previous malfunctions of this type on any of the CRDMs. | |||
: b. Control Rod Drive No 30 manufacturer is Combustion Engineering, Inc and the piece number is J-2966-163-001 * | |||
*}} | *}} | ||
Revision as of 08:57, 20 October 2019
| ML18353B231 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 04/10/1975 |
| From: | Sewell R Consumers Power Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| LER 1975-002-00 | |
| Download: ML18353B231 (2) | |
Text
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consumers
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/:0j :~:.. ~-t~. -- .
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Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201
- Area Code 517 788-0550 Division of Reactor Licensing Re: Docket 50-255 US Nuclear Regulatory.Commission License DPR-20 Washington, DC 20555 Palisades Plant UE-75-2 Gentlemen:
- Attached is Unusual Event Report UE-75-2 which covers the failure of Control Rod No 30 to drop properly. This failure occurred during testing with the plant in hot shutdown and there was no effect on plant operation.
The Palisades Technical Specifications permit plant operation with an inoperable control rod.
Very truly yours, DAB/ce Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC
- 1. Report No:
UNUSUAL EVENT REPORT Palisades Plant UE-75-2, Docket 50-255 2a. Report Date: April 1, 1975 2b. Occurrence Date: March 29, 1975
- 3. Facility: Palisades Plant, Covert, Michigan
- 4. Identification of Occurrence: Control Rod No 30 failed to drop properly during rod drop timing test.
- 5. Conditions Prior to Occurrence: The reactor was in the hot shutdown condition.
- 6. Description of Occurrence: On March 29, 1975 CRDM torque and control rod drop testing was being conducted. During the testing, Control Rod No 30 failed to drop properly when the clutch switch was opened. Successive testing showed rough operation coupled with slow or incomplete rod drops.
- 7. Apparent Cause of Occurrence: An apparent cause of the event has not been de-
- termined. Further investigation will be conducted at the next cold shutdown *
- 8. Analysis of Occurrence: PRC review of the incident concluded that plant opera-tion can continue per Technical Specifications Section 3.10.4.b. The control rod is mechanically operable but is classified as "inoperable" because it can-not be satisfactorily tripped.
- 9. Corrective Action: The following corrective action was taken or will be taken:
- a. It was recommended that this control rod not be further exercised or oper-ated unnecessarily and so noted in daily orders in shift supervisor's office.
- b. Continue the investigation into the cause of the malfunction. Engineering assistance is to be provided to follow up on the repair of the drive unit.
- 10. Failure Data:
- a. There is no record of any previous malfunctions of this type on any of the CRDMs.
- b. Control Rod Drive No 30 manufacturer is Combustion Engineering, Inc and the piece number is J-2966-163-001 *