ML20086H852
| ML20086H852 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/23/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20086H854 | List: |
| References | |
| AO-75-35, NUDOCS 8401200295 | |
| Download: ML20086H852 (2) | |
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'J PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET PHILADELPHI A. PA.19101
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May 23,1975
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Mr. A. Giambusso
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Division of Reactor Licens,ing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Don Caphton, Region 1, Office of Inspection and EnforceJnent, United States Nuclear Regulatory Commission on May 16, 1975 Written notification was made to Mr. James P. O'Rei l ly, Region 1, Of fice of Inspection and Enforce-ment, United States Nuclear Regulatory Commission on May 16, 1975 In accordance with Section 6.7.2.A of the Technical Specifications, Appe nd ix A of DPR -44 f or Uni t 2 Peach Bottom Atomic Power Station, the following occurrence is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-44 Technical Specificat ion
Reference:
Table 3 2.A Report No.:
50-277-75-35 Report Date:
May 26, 1975 Occurrence Date:
May 16, 1975 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsy vania 17314 Identification of Occurrence:
Reactor Water Cleanup System High Temperature Isolation Switch TS-2-12-99 tripped at higher than acceptable values.
Conditions Prior to Occurrence:
Unit 2 at full power.
sc2 Description of Occurrence:
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During a routine instrument surveillance test, T S 12-()9 was found to trip at 215 F, which is a higher setpoint than its allow-able Iimit of 1400F.
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8401200295 750523 PDR ADOCK 05000277 COPY SENT REGION _
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('l 50-277-75-35 May 23,19J5 A'
Page 2 Designat ion of Apparent Cause of Occurrence:
The instrument is mounted on a local rack in an open hallway which has been heavily traveled due to pump maintenance work in the area. The setpoint knob adjustment protrudes from the front of the device and was apparently inadvertently moved.
Analysis of Occurrence:
Safety significance of this incident is minimal.
The function of this switch is to prevent damage to the demineralizer resin from high temperature by isolating the system when the demincr-a l i zer inlet water temperature reaches 1400F.
Correcti ve Action:
The switch was immediately reset and checked in accordance with the applicable calibration check type of surveillance test.
A full front protective cover will be installed over the setpoint knob to prevent it from being inadvertent ly moved.
Failure Data:
One previous, which occurred on September 22, 1973 Very truly yours,
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M.
Cooney As t Gen'l Supe intendent Generation Division ec:
Mr. J. P. O'Reilly Director, Region i Office of Inspection and Enforcement United States Nuclear Regulatory Commission 631 Park Avenuc King of Prussia, PA 19406 m-