ML18353B268: Difference between revisions
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{{#Wiki_filter:,. | {{#Wiki_filter:,. | ||
* | * Hegulatory Dodtet File 1 | ||
* Area Code 517 788-0550 Directorate of Licensing US Nuclear Regulatory Commission Washington, DC 20555 | * consumers | ||
* Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201 | |||
* * | * Area Code 517 788-0550 Directorate of Licensing Re: Docket US Nuclear Regulatory Commission License DPR-20 Washington, DC 20555 Palisades Plant - A0-11-75 Gentlemen: | ||
* | Attached is Abnormal Occurrence Report A0-11-75 which in-volves a safety setting on the linear power channel of the reactor protective system. The analysis of the occurrence concluded that | ||
* there was no significant effect on safety . | |||
Palisades Plant, Covert, Michigan 4. Identification of Occurrence: | Yours very truly, DAB/ds Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC | ||
Linear power channel reactor protective system setting above technical specifications set point. 5. Conditions Prior to Occurrence: | * | ||
Plant operating at steady-state 80 percent thermal power. 6 | |||
While performing monthly surveillance cedure MD-1, it was found that Channel NI-005 trip point was above the Technical Specifications limit, Table 2.3.1, of less than or equal to 106.5 percent by 0.3 percent. The set point was corrected . The linear power channel drawer was replaced with a spare. Designation of Apparent Cause of Occurrence: | ** * | ||
Component Failure -Channel, Internal Positive 15-Volt Power Supply. Analysis of Occurrence: | * ABNORMAL OCCURRENCE REPORT Palisades Plant | ||
The reactor protection system is a 2 out of 4 system. Inasmuch as only one channel was affected, the system remained functional. | : 1. Report No: A0-11-75, Docket 50-255 2a. Report Date: May 30, 1975 2b. Occurrence Date: May 29, 1975 | ||
In addition, the set point was at plus 106.8 percent whereas the safety analysis, FSAR Section 14.1, assumed a power level of 112 percent. We have concluded that this occurrence had no cant effect on plant safety. Corrective Action: Repair failed component. | : 3. Facility: Palisades Plant, Covert, Michigan | ||
Our records indicate that this is only the second failure out of 13 units in 6 years; thus, we have concluded no further action is required. | : 4. Identification of Occurrence: Linear power channel reactor protective system setting above technical specifications set point. | ||
Failure Data: a. Previous Failure -Similiar Unit 10/5/72. b. Equipment Identification | : 5. Conditions Prior to Occurrence: Plant operating at steady-state 80 percent thermal power. | ||
-Technipower Power Supply Model 227-4170 .}} | : 6. Description of Occurrence: While performing monthly surveillance Pro-cedure MD-1, it was found that Channel NI-005 trip point was above the Technical Specifications limit, Table 2.3.1, of less than or equal to 106.5 percent by 0.3 percent. | ||
* The set point was corrected . | |||
The linear power channel drawer was replaced with a spare. | |||
: 7. Designation of Apparent Cause of Occurrence: Component Failure - | |||
Channel, Internal Positive 15-Volt Power Supply. | |||
: 8. Analysis of Occurrence: The reactor protection system is a 2 out of 4 system. Inasmuch as only one channel was affected, the system remained functional. In addition, the set point was at plus 106.8 percent whereas the safety analysis, FSAR Section 14.1, assumed a power level of 112 percent. We have concluded that this occurrence had no signifi-cant effect on plant safety. | |||
: 9. Corrective Action: Repair failed component. Our records indicate that this is only the second failure out of 13 units in 6 years; thus, we have concluded no further action is required. | |||
: 10. Failure Data: | |||
: a. Previous Failure - Similiar Unit 10/5/72. | |||
: b. Equipment Identification - Technipower Power Supply Model 227-4170 . | |||
I . | |||
*}} | |||
Revision as of 08:57, 20 October 2019
| ML18353B268 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/09/1975 |
| From: | Sewell R Consumers Power Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| LER 1975-011-00 | |
| Download: ML18353B268 (2) | |
Text
,.
- Hegulatory Dodtet File 1
- consumers
- Area Code 517 788-0550 Directorate of Licensing Re: Docket US Nuclear Regulatory Commission License DPR-20 Washington, DC 20555 Palisades Plant - A0-11-75 Gentlemen:
Attached is Abnormal Occurrence Report A0-11-75 which in-volves a safety setting on the linear power channel of the reactor protective system. The analysis of the occurrence concluded that
- there was no significant effect on safety .
Yours very truly, DAB/ds Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC
- *
- ABNORMAL OCCURRENCE REPORT Palisades Plant
- 1. Report No: A0-11-75, Docket 50-255 2a. Report Date: May 30, 1975 2b. Occurrence Date: May 29, 1975
- 3. Facility: Palisades Plant, Covert, Michigan
- 4. Identification of Occurrence: Linear power channel reactor protective system setting above technical specifications set point.
- 5. Conditions Prior to Occurrence: Plant operating at steady-state 80 percent thermal power.
- 6. Description of Occurrence: While performing monthly surveillance Pro-cedure MD-1, it was found that Channel NI-005 trip point was above the Technical Specifications limit, Table 2.3.1, of less than or equal to 106.5 percent by 0.3 percent.
- The set point was corrected .
The linear power channel drawer was replaced with a spare.
- 7. Designation of Apparent Cause of Occurrence: Component Failure -
Channel, Internal Positive 15-Volt Power Supply.
- 8. Analysis of Occurrence: The reactor protection system is a 2 out of 4 system. Inasmuch as only one channel was affected, the system remained functional. In addition, the set point was at plus 106.8 percent whereas the safety analysis, FSAR Section 14.1, assumed a power level of 112 percent. We have concluded that this occurrence had no signifi-cant effect on plant safety.
- 9. Corrective Action: Repair failed component. Our records indicate that this is only the second failure out of 13 units in 6 years; thus, we have concluded no further action is required.
- 10. Failure Data:
- a. Previous Failure - Similiar Unit 10/5/72.
- b. Equipment Identification - Technipower Power Supply Model 227-4170 .
I .