ML20086G951
| ML20086G951 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/10/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086G954 | List: |
| References | |
| AO-75-19, NUDOCS 8401130081 | |
| Download: ML20086G951 (2) | |
Text
{{#Wiki_filter:_ _. o o 4 PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHI A. PA.19101 (215)8414000 April 10, 1975 Mr. A. Giambusso Director / Division of Reactor Licensing l '[ e Of fice of Nuclear Reactor Regulations y. ' ' p ' l ': ,, W5 - United States Nuc lear Regulatory Commission Washington, DC 20555 'A t ? '\\
Dear Mr. Gia.,
busso: Q_v
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Eldon Brunner, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Comission on March 31, 1975 Written notification was made to Mr. James P. O'Reilly, Region I, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on April 1, 1975 In accordance with Section 6.7.2.A of the Technical Specifica-tions, Appendix A of OPR-56 f or Unit 3 Peach Bottom Atomic Power Station, the follcwing report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification
Reference:
Table 3 1.1 Report No.: 50-278-75-19 Report Date: April 10, 1975 i Occurrence Date: March 31, 1975 Facility: Peach Bottom Atomic Power Station R. D. 1, Delta, Pennsylvania 17314 Identification of Occurrence: Setpoint of condenser low vacuum scram pressure switch PS-3 llA found to be outside the, Technical Specification limit. Conditions Prior to Occurrence: Unit 3 at full power. Description of Occurrence: During a routine instrument. surveillance test, PS-3-5-llA was found to trip at 22.4 in. Hg. The Technical Specification limit is greater than or equal to 23 in. Hg. OOPY SENr REGION hgd 8401130081 750410 / j;. ; n G PDR ADOCK 05000278 M g PDR j
m 's Mr. A. Giambus> 50-278-75-19 April 1,0, 1975 Page 2 i Designation of Apparent Cause of Occurrence: Setpoint shift. i Analysi s of Occurrence: The contacts of this device are arranged in a one-out-of-two t twice trip logic. The setpoint of this device, not the trip function, was unsati sf actory. All other devices monitoring the parameters of condenser vacuum were immediately tested and found to be operational ] and correctly calibrated. Because of the above, this occurrence has minimal safety implications. Corrective Action: The out-of-tolerance pressure switch was immediately recali-brated to within the allowable limits of the Technical Specifications and calibration checked in accordance with the applicable surveillance test. The other three devices monitoring the same variable were tested and found to be satisfactory in both function and setpoint. Failure Data: Seven occurrences of this type have been previously reported A0-50-277-74-1, A0-50-277 19, A0-50-278-74-24, A0-277-74-35, as: A0-50-277-74-43, A0-50-277-75-1, and A0-50-277-75-19 Very truly yours, i j M. Cooney As 't Gen't Superintendent j Generation Division. I I cc: Mr. J. P. O'Rei lly Director Region I -Office of Inspection and Enforcement United States Nuclear Regulatory Commission ~ t 631 Park Avenue l King of Prussia, PA 19406 l m-e y--*=vm1----*e--' mew wwg T y c-+ =Wm ~. er**+- ww*,my f f-WO-
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