ML20086H037
| ML20086H037 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 02/06/1975 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086H035 | List: |
| References | |
| AO-75-10, NUDOCS 8401130358 | |
| Download: ML20086H037 (1) | |
Text
h Q
g 7
LADELPHIA ELECTRIC COMPANY Peach Bottom Atomic Power Station Delta, Pennsylvania 17314 February 6, 1975 Mr. James P. O'Reilly, Director United States Atomic Energy Conamission Nuclear Regulatory Coantission 631 Park Avenue E
m King of Prussia. Pennsylvania 19406
Subject:
Abnormal Occurrence 24-Hour Notification _
Confirming W.
T. Ullrich's conversation with Mr. Walt Baunack, A.E.C.
Region 1 Nuclear Regulatory Cossaission 4 on February 6,1975.
Roference:
License Number DPK-56 Tachnical Specification
Reference:
Table 3.2.B Report No.:
50-278-75-10 Rspart Date:
Pebruafy 6,1975 -
Gecurrence Date:
Pabruary 5,1975 Pccility:
Peach Botton Atomic Power Station
=
R.D.
- 1. Delta, Pennsylvania 17314 y
Idantification of Occurrence:
Setpoint shift on RCIC Steam Line Hi Plow Isolation Switch dP15-3-13-83 Conditions Prior to Occurrence:
Unit 3 shutdown.
7 D23cription of Occurrence:
During routine instrument surveillance testing, dPIS-3-13-83 was found to trip at 512 inches H20 The Technical Specification limit is < 450 inches H2O
(
differential.
w ignation of Apparent Cause of Occurrencet Binding between the can followe; roller skirt and the can; unevenness of the roller on the can follower.
j ilysis of Occ,urrence:
The safety implicati_ons are minimal since this switch was operable at less than the design limit of 300% flow (600 inches H2O differential), each switch acts independently to isolate the systers,, and the cc wanion switch was tested and found to trip within the Technical Specification limits.
crrective Action:
-Investigation tevealed two' things:
(1) there was some apparant binding between h
the can follower roller skirt and the can (2) unevenness in the roundness of the roller which causes setpoint shift.
The ceta follower was replaced; properly aligned; setpoint calibrated; and the switch che cked for proper calibration per tb applicable surveillance test.
Faif.ure Data:
Similar setpoint shif to reported as Abnormal Occurrences 50-277-74-41, 50-278-74-2 and 50-277-74-49.
ary truly yours, 8401130358 750215 PDR ADOCK 05000278 S
paa REGULATORY OPERATIONS pfe 9ppygd T. Ullrich, Superintendent FILE COPY t,
L ye
. y Q y, <.t.... ' b.~
,+l=J.g'3 4 f -(. 7 gf.s. A y y.
t
.. [
~