ML18283B110
| ML18283B110 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/24/1975 |
| From: | Eric Thomas Tennessee Valley Authority |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| BFA0-50-260/752W | |
| Download: ML18283B110 (6) | |
Text
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AEC DISTRI-UTIG,I FOn'PART50 DOCI ET MAi;ilAL tTEl'.iPQI1ARY FOAi'.I)
CQiVTRO L NO:
4 R E'~
907 Mr, Edson G. Ghse CLASS UNCLASS PROP INFO
'DESCRIPTION:
Ltr trans the following:
FRO. >. Tennessee Valley Authorit Chattanooga, Tenn E,F ~ Thomas TO DATE OF DOC 1-24-75 ORIG 1-signed INPUT DATE R EC'0 LTR RPT OTHER 1-28-75 CC OTHER NO CYS REC'D I
ENCLOSURES:
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xxxx SB DOC~"-T iVO'0-260 Abnormal Occurrence fP752W on 1-24-75 concerning the RCIC turbine tripped during operation.
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TEPKlESSEE VALLEYAUTHSIIW CHATTANOOGA) TENNESSEE 0
RVAD7 January 24, 1975
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ANNIVERSARY OF PEOPLE IN PARTNERSHIP Mr. Edson G. Case Acting Director of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20545
Dear Mr. Case:
TENNESSEE VALLEYAUTHORITY -
BROWNS FERRY NUCIZAR PIANT UNIT 2-DOCKET NO. 50-260 - FACILITY OPERATING LtICENSE DPR ABNORMAL OCCURRENCE REPORT BFAO-50-260/752W The enclosed report is to provide details concerning the RCIC turbine which tripped. during operation and is submitted. in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973.
This event occurred.
on Browns Ferry Nuclear Plant unit 2 on January 16, 1975.
Very truly yours, TENNESSEE VALLEYAUTHORITY ector of Power Production Enclosure CC (Enclosure):
Mr. Norman C. Moseley; Dizector U.S. Nuclear Regulatory Commission Regional Office 230 Peachtree
- Street, NW., Suite 818 Atlanta, Georgia 30303 r
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..BNORMAL OCCURRENCE REPORT Report No.:
BFAO-50-260/752W Repor't J)ate:
January 24, 1975 Occurrence Date January 16> 1975 Faci.lity:
Browns Ferry Nuclear Plant unit 2 Identification of Occurrence The RCIC 4urbine tripped during operation.
Conditions Prior to Occurrence The unit was in hot shutdown condition and the RCIC was being operated to remove decay heat from the reactor.
Descri tion of Occurrence The RCIC was operating at a steady state and tripped.
Resetting of the steam inlet throttle valve from the control room could not be accomplished.
An inspection of the turbine was made, and movement of the overspeed linkage allowed the turbine to be reset and. manually started.
The RCIC was inoperable for 25 minutes.
Desi nation of A arent Cause of Occurrence The apparent cause of the RCIC turbine trip was the misposition of the mechanical overspeed emergency tappet nut.
The flat surface on the tappet nut had rotated out of alignment with the emergency head lever, thus allowing the mechanical overspeed tappet and. ball to raise when the electric solenoid trip was actuated.
Vibration from turbine operation could cause a partially raised overspeed tappet nut to disengage with the head lever and trip the turbine.
Ana sis of Occurrence There was no damage to any systems, components, or structures as a result of this occurrence nor were there any adverse effects to the public health and safety.
Other core cooling equipment was available if it had been required.
The RCIC turbine was restored to service in 25 minutes and was satisfactorily operated during the cooldown of the reactor.
Corrective Action The overspeed emergency tappet nut was rotated for proper alignment with the emergency head. lever.
The proper engagement between these parts was checked and found to be satisfactory.
The overspeed actuating linkage was checked for freedom of movement, and a slight binding in one connection was removed.
The electric solenoid was actuated several times with no movement of the tappet nut observed.
Set screws on the actuating linkage were checked for tightness with levers in their proper position.
Failure Data Unit 2 RCIC Pump Drive Terry Steam Turbine Co.
Hartford., Connecticut
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