TXX-6954, Final Deficiency Rept CP-87-50 Re Abnormal Thrust Bearing Temp on Turbine Driven Auxiliary Feedwater Pump.Initially Reported on 870727.Pumps Will Be Dismantled & Balancing Drum Installed.Records Will Be Available for Review After 880131
| ML20236P007 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/13/1987 |
| From: | Counsil W, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-50, TXX-6954, NUDOCS 8711170101 | |
| Download: ML20236P007 (2) | |
Text
-
y 1
M Lo
- TXX-6954-i 3
5 Fi e # 10110 j
c
=
=-
910.4 Ref #10CFR50.'55(e)
M# ELECTRIC November 13.-1987
. wmiam c. coumil Eucutive Vice Prnident U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, 0.C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 TURBINE ORIVEN AUXILIARY FEEDWATER PUMP BEARING' TEMPERATURE SOAR: CP-87-50 (FINAL REPORT)
Gentlemen:
On July 27, 1987, we verbally notified your Mr. H. S, Phillips of a deficiency involving abnormal thrust bearing temperatures on the Turbine Driven Auxiliary Feedwater Pump.
Our most recent interim report, logged TXX-6931 was submitted on November 6, 1987..After further evaluation we have determined that this is a reportable item under the provisions of 10CFR50.55(e), and the required information follows.
DESCRIP7 ION OF THE DEFICIENCY During the preoperational test of the CPSES Unit 1 Turbine Driven Auxiliary Feedwater Pump cpl-AFAPTD-01, an excessively high thrust bearing temperature was recorded.
Ingersoll-Rand (I-R), the pump manufacturer, was contacted to assist in determining the cause of the high temperatures. According to I-R, the problem of high thrust bearing temperatures is not uncommon to pump model HMTA, furnished for auxiliary feedwater service.
The reason for the abnormal bearing temperature appears in part to be improper installation and centering of the balancing drum.
Installation instructions in the pump manual are lacking in specific detail that would eliminate either misunderstanding of j
requirements or misinterpretation of design criteria.
1 SAFETY IMPLICATIONS The Auxiliary Feedwater (AFW) Pumps function to procide emergency cooling water to the Steam Generators during or following certain events that cause the -loss of main feedwater or create a need for addit ional makeup feedwater essential for safe plant shutdown.
Although this problem was discovered l
during a test of the Turbine-Driven AFW Pump on Unit 1, the Motor-Driven AFW l
Pumps utilize the same pump model.
Therefore, this condition creates the potential for the failure of all AFW pumps, possibly resulting in the complete loss of Auxiliary Feedwater.
This condition affects both Units 1 and 2.
9 8711170101 871113 7
PDR ADOCK 05000445 h
I s
PDR l
400 North Olise Street LB 81 Dallas, Texas 7520)
\\
__.____:__a__-__-_-_-__-..__._-__.-_-----_
_ _ _ - - _ _ - - -. _ _.. _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ - _ - - - - _ _ _ - = _ _ - _ -. _ _ _ _ _ _.
,,...,... - = - - -
= - -
c p
. c;.c y,3:'2'-
- u j 7,;
.TXX-6954 I November 13,'.1987
'Page 2 of 2;
' CORRECTIVE' ACTION e
'The AFW pumps will be dismantled and the b'alancing. drums installed in l
accordance with the,recently issued I-R. Technical Bulletin 60-87,.Which
?
provides~aLmore detailed description of. balancing drum installation.
This-l
,. action Lis: scheduled for completion by December-31,1987,.for al.1 ' AFW pumps on
- operatio. Final system ' testing _ prior to fuel. load will verify proper pump.
Unit 1.
n.
This same corrective. action will be performed on Unit 2 prior:to -
~
Unit 2 fuel = load.
L
. Records supporting the, implementation of corrective action on Unit I will be available'for your. inspectors to review at the CPSES site after January 31, 1988 Very truly yours,
&.b 0 L
W. G. Counsil By:
D. R. Woodlan Supervisor, Docket Licensing MCP/mgt-c - R. D. Martin, Region IV Resident Inspectors', CPSES (3) t i
l
_:_____-