ML20086H889
| ML20086H889 | |
| 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 | |
| ML20086H892 | List: |
| References | |
| AO-75-34, NUDOCS 8401200311 | |
| Download: ML20086H889 (2) | |
Text
F L. x' n*
p)
(,)
s PHIL'ADELPHIA ELECTRIC COMPANY 23O1 M ARKET STREET
. ~, -.
PHILADELPHIA. PA.19101
/Q grp
,/Qf
< ;, g, / j,'/,
'(, \\
tzis 0414000
\\' f IC
.Cg,f*c ;! ll f'i May 23,1975
?
t 3
-As 1
".c
\\
Mr. A. Giambusso Director Y -
r
.'J' Division of Reactor Licensing Of fice 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 Enforcement, United States Nuclear Regulatory Commission on May 16, 1975 Writ ten notification was made to Mr. James P. O'Reilly, Region 1, Office of Inspection and Enforce-ment, United States Nuclear Regulatary Commission on May 16, 1975 In accordance with Section 6.7.2. A of the Technicel Specifications, Appendix A of DPR-44 f or Unit 2 Peach Bottem Atomic Power St at ion, the following occurrence is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-44 Technical Specification
Reference:
4.S.G Report No.:
50-277-75 Report Date:
May 23,1975 Occurrence Date:
May 15, 1975 Facility:
Peach Bottom Atomic Power Station R.D. I, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of LS-4221 to operate (RHR loop
'A' high point vent) on, low accumulator level.
Conidtions Prior to Occurrence:
Unit 2 at fulI power.
de.277 Descript ion of Occurrence:
3p d " /
4 During routine local leak rate testing of RHR system valves, it was noted that the low level alarm did not operate and vent solenoid valve SV-4221 did not open.
COPY SENT REGION _
8401200311 750523 PDR ADOCK 05000277 S
PDR r, n q i,
s-vr
.m'
j o f*
- (
' 30-277-75-34 Mr. A. G i ambusso
- Page 2 May 23,1975 Designation of Apparent Cause of Occurrence:
Apparent binding in the switch assembly.
Ij Analysis of Occurrence:
l The safety implications are minimal since the system was found l
to be full at the start of the local Icak rate test.
Corrective Acticn:
the During the time the solenoid valve was out of service, high point vent was checked to ensure a full system. The pressurizing system remained in service during this time.
Investi]ation revealed caused that switch binding, along with misalignment of the switches, The switches were replaced and aligned to give the optimum the failure.
trip ahd reset actions. The switch assembly was then functionally tested several times to verify consistent operation.
Failure Data:
Two previous, reported as A0-50-277-75-4 and A0-50-278-75-20.
i 8
Very truly yours, 97 M. J' Cooney ff Ass t Gen't Superintendent Generation Division cc: Mr. J. P. O ' Re i l l y Director, Region 1 Of fice of Inspecti on and Enf orcement United States Nuclear Regulatory Cannission 631 Park Avenue King of Prussia, PA 19406 r-7
,