ML18353B268: Difference between revisions

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* Hegulatory Dodtet File 1
Hegulatory Dodtet File 1
* consumers
* consumers
* Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201
* 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:
* 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
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 .
* there was no significant effect on safety .
Yours very truly, DAB/ds                                      Ralph B. Sewell Nuclear Licensing Administrator CC:  JGKeppler, USNRC
Yours very truly, DAB/ds                                      Ralph B. Sewell Nuclear Licensing Administrator CC:  JGKeppler, USNRC
*
                        **                                *
* ABNORMAL OCCURRENCE REPORT Palisades Plant
* 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
: 1. Report No:  A0-11-75, Docket 50-255 2a. Report Date:  May 30, 1975 2b. Occurrence Date:  May 29, 1975
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: 5. Conditions Prior to Occurrence:  Plant operating at steady-state 80 percent thermal power.
: 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.
: 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 set point was corrected .
The linear power channel drawer was replaced with a spare.
The linear power channel drawer was replaced with a spare.
: 7. Designation of Apparent Cause of Occurrence: Component Failure -
: 7. Designation of Apparent Cause of Occurrence: Component Failure -

Latest revision as of 15:00, 2 February 2020

06/09/1975 Letter Submitting Abnormal Occurrence Report AO-11-75 Which Involves Safety Setting on Linear Power Channel of Reactor Protective System
ML18353B268
Person / Time
Site: Palisades Entergy icon.png
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)
v • d • e


Text

,.

Hegulatory Dodtet File 1

  • 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 .

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 .

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