ML20086H031
| ML20086H031 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 02/15/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086H035 | List: |
| References | |
| AO-75-10, NUDOCS 8401130351 | |
| Download: ML20086H031 (2) | |
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\\cc February 15, 1975 Mr. A. Giambuseo Director Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Cmmission Washington, D.C.
20555
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, Off1ce of Inspection and Enforement, Region 1, United States Huclear Regulatory Ccr:: mission on February 6,1975 Written notifitation was made to Mr. James P. O'Reilly, Office of Inspection and Enforument, Region 1, United States Nuclear Regulatory Cmmission on February 6, 1975.
In accortlance with Section 6 7.2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottcm Atmic Power Station, the following report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence:
Reference:
License Number DPR-56 Technical Specification
Reference:
Table 3 2.B Report No.:
50-278-75-10 Report Date:
February 15, 1975 Occurrence Date:
February 5,1975 Facility:
Peach Bottom Atomic Power Station R.D.1, Delta, Pennsylvania 1731h Identification of Occurrence:
Setpoint shift on RCIC Steam Line Hi Flow Isolation Switch dPIS-2-13-83.
Conditions Prior to Occurrence:
Unit 3 shutdown.
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.Mr. A. Giambu F;bmery 15, 5
j P ga 2 Descriotion of Occurrence:
During routine instrument suiveillance testing, dPIS-3-13-83 at 512 inches H 0.
The Technical Specification limit was found to trig 2 2
is g h50 inches 0 differential D_esignation of Apoarent Cause of Occurrence:
Binding between the cam follower roller skirt and the cam; unevenness of the roller on the cam follower.
Analysis of Occurrence:
The safety imnlications are minimal since this switch was operable at less than the design limit of 300% flow (600 inches H O 2
differential), and the companion redundant switch was tested and found to trip within the Technical Specification limits.
Corrective Action:
Investigation revealed two things:
(1) there was some apparent binding between the com follower roller skirt and the cam (2) unevainess in the roundness of the roller which causes setpoint shift. The cam follower was replaced; properly aligned; setpoint calibrated; and the switch checked for proper calibration per the applicable surveillance test.
Failure Data:
Similar setpoint shifts reported as Abnormal Occurrences 50-277-7h-bl, 50-278-7h-21, and 50-277-7h-h9 Very truly yours, M.
. Cooney A s't Gen'l Superintendent Generation Division cct Mr. J. P. O'Reilly l
Director l
Office of Inspection and Enfortement Region 1 United States Nuclea2 Regulatory Car. mission i
631 Park Avenue King of Prussia, PA 19h06 l
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