ML20086J213
| ML20086J213 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 11/29/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086J217 | List: |
| References | |
| AO-74-25, NUDOCS 8401230321 | |
| Download: ML20086J213 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA, PA.19101 1 ~
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y November 29, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrenca was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on November 20, 1974.
Written notification was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on November 20, 1974.
In accordance with Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification Reference Table 4.2.B Repor t No.:
50-278-74-25 Report Date:
November 29, 1974 Occurrence Date: November 19, 1974 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania Identification of Occurrence:
Failure of a torus high water level switch LS-3-23-91A to operate. This switch cperates to transfer the HPCI suction from the condensate storage tank to the suppression pool.
Conditions Prior to Occurrence:
Unit 3 at greater than 90% power.
Description of Occurrence:
During a routine instrument surveillance test, LS 23 - 91 A pl d7 j' failed to operate.
e d55-y Designation of Apparent Cause of Occurrence:
The switch assembly flapper arm was found - to interfere slighplyp..
with the switch case.
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November 29, 1974 Page 2 Analysis of Occurrence:
LS-3-23-31A and LS-3-23-91B operate independently to transfer the HPCI suction from the condensate storage tank to the suppression pool. LS-3-23-918 had just been tested and found to function properly.
Because the f ailure of LS-3-23-91A to operate would not have interfered with the' proper operation of the system, the safety implications are minimal.
Corrective Action:
The switch was reacjusted to allow proper operation of the switch. The switch was cycled a number of times using water to lif t the float to ensure reliable operation. and then rechecked using the appro-priate instrument surveillance test.
Failure Data:
No previous failures on this type of switch.
Very truly yours, I. 1 j k(['.l' i -:i " ' c -
Cooneyf MJ Ass't Gen'1 Superintendent
' Generation Division cc:
Mr. J. P. O'Reilly Director, Region 1 United _ States Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406 l-I l
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