ML20084S226

AO 50-265/75-27:on 750729,during HPCI Monthly Surveillance Operation Only Able to Attain Pump Flow Below Tech Spec Limit.Caused by Improper Pinning of Pilot Valve Lever Arm. Lever Arm Adjusted

ML20084S226
Person / Time
Site:	Quad Cities
Issue date:	08/08/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20084S228	List: ML20084S226 ML20084S229 ML20084S232
References
AO-50-265-75-27, NJK-75-406, NUDOCS 8306160270
Download: ML20084S226 (3)

Text

y- p

' ~ ' I lth Edis:In m Yi O '. dComm: Quad Citic Post Othco lear Power Station 216 I i V

e' '

! Cordova !!hnois61242 s-

/ Tc!cphone 303/654-2241

~..

s

. s h

t 7g -

NJK-75-406 ., ,

N'

\

~ U j u.d August 8, 1975 ~

Ofrcctor of Office of Nucicar Reactor Regulation ,

U. S. fluclear Regulatory Commission Washington, D. C. 20555

Reference:

Quad-Citles fluclear Power Station Docket No. 50-265, DPR-30, Unit 2 -

Appendix A, Sections 1.0.A.2, 3.5.C.1, 6.6.B.I.a Enclosed please find Abnormal Occurrence Report flo. 50-265/75-27 for quad-Citics Nuclear Power Station. This occurrence was previously reported to Region lit, ,

Directorate of Regulatory Operations by telephone on July 29, 1975 and to you and Region III, Directorate of Regulatory Operations by telecopy on July 29, 1975 I This report is submitted to you in accordance with the requirements of Technical l Specification 6.6.B.I.a. .

' Very truly yours, COMit0NUEALTil EDIS0ll COMPAllY QUAD-CITIES tlUCLEAR POWER STATl0tl 4 /

N. J. Kalivianakis '

Station Superintendent l NJK/LLH/rhb cc: Office of Inspection and Enforcement .

G. A. Abrell Q gA&j  !

f" J 8306160270 750000 (10PY !ENT REGT'ON

/ N j PDR ADOCK 05000265 i 8 PDR l

fy e, P 9 -

e

.g .o b1 REPORT tlVMBER: A0-50-265/75-27 REPORT DATE: August 8, 1975 OCCURREllCE DATE: July 29, 1975 .

FACILITY: Quad-Citics fluclear Power Station Cordova, Ill. 61242 IDEllTIFICATI0tt 0F OCCURREllCE:

Unit 2 liigh Pressure Coolant inJcction (IIPCI) system pump low flow.

C0tlDITl0NS PRIOR TO OCCURREf1CE: i Unit 2 was operating steady state at 603 Mwe.

DESCRIPTION OF OCCURREtiCE:

At 4:45 AM on July 29, 1975, the Unit 2 High Pressure Coolant injection (HPCI) monthly surveillance was being performed. The operator was only  :

able to attain a pump flow rate of 4860 gallons per minute instead of the '

required flow rate of 5000 gallons per minute. The Reactor Core isolation Cooling System (RCIC), Low Pressure Coolant injection (LPCI) mode of the Residual licat Removal System (RHR), both Core Spray Loops, and the Auto-matic Pressurc Relief system were tested and proven operable.  ;

DESIGNATl0t1 0F APPAREllT CAUSE OF OCCURRENCE; E_QUIPMEf1T FAILURE - Improper ; inning of the pilot valvo lever arm during

.i n i t i a l installation is designated as the apparent cause of this occur- 1 rence. it was determined that the speed control linkage was not properly restrained to maintain the adjustment necessary to allow the turbine to operate at high enough speed. Tiis lower than adequate speed caused the pump to deliver slightly less than its' required flow. A General Electric Company field representative, along with station personnel, carried out the investigations and determined that the lever arm was out of adjustment and was thus limiting turbine speed.

The similar linkage on the Unit I HPCI turbine was inspected and found to be properly pinned.

ANALYSIS OF OCCURRENCE:

The safety implications were minimal since the flow rate was only 3% less  ;

than the required 5000 gpm flow rate. Additionally the RCIC, LPCI mode of RHR, j Core Spray loops Ar,0, and the Automatic Pressure Relief system were all operable.

At no time was there any undue safety hazard present to the public or plant personnel.

I u c .%

f

~

/

( ,

• f Q' . ' I CORRECTIVE ACTION:

f*

The corrective action was to prove RCIC, LPCI Mode of RHR, Core Spray loops l

A&D, and the Automatic Pressure Relief system operable.

Corrective action to prevent reoccurrence was to adjust the lever arm on the pilot valve to allow a turbine maximum speed of 4350 RPM and the motor gear unit high speed stop was adjusted to 43a0 RPM. The HPCl unit was then retested and proven operable at II:10PM, July 29, 1975 Flows rates in excess of 5000 gpm were achieved.

FAILURE DATA: ,

There have been no similar low flow occurrences in the past at Quad-Cities.

Increased HPCI turbine capability should preclude any further occurrences of this type.

o O

4 e