ML20086B432

AO 50-267/74-12:on 740628,turbo-charger on Diesel Engine K-9205X Failed.Caused by Blower Lube Oil Leaking Into exhaust.Turbo-charger Assembly Replaced & Debris in Engine C Removed

ML20086B432
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/08/1974
From:	Mathie F, Swart F PUBLIC SERVICE CO. OF COLORADO
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086B430	List: ML20086B432 ML20086B439
References
AO-50-267-74-12, NUDOCS 8311170219
Download: ML20086B432 (4)

Text

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O public servlee company off Collerado P. O. Box 361, Platteville, Colorado 80651 l

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July 8, 1974 -

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Mr. Angelo Giambusso d I @! .

Deputy Director for Reactor Projects Directorate of Licensing U. S. Atomic Energy Com:nission Washington, D. C. 20545 REF: Facility Operating License No. DPR-34 Docket No. 50-267 Dec.r Mr. Cir.mhusso:

Enclosed please find 3 copies of Abnormal Occurrence Report No.

50-267/74/12, submitted per the requirements of the Technical Specifications.

Very truly yours, tc[CN u

Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES:11 4/

8311170219 740903 ,'v h.I PDR ADOCK 05000 /

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DATE June 28, 197, AB!iORMAL OCCURRE!;CE ']

FORT ST. VRAI!i NUCLT,.AR CENERATI!'G STATIO!!

PUBLIC SERVICE COMPANY OF COLORADO

. i P. O. BOX 361 PLATTEVILLE, COLORADO 80651 ,

REPORT !0. 50-267/74/12 -

Prelimin'ary 0_,

Final , @

IDEllTIPICATION OF OCCUltRE"CC: ,

The turbo-charger on dicsc1 engine K-9205X ("C" engine of "n" diesel generator) failed as the unit van being started for survyillance tccting Friday, June 28, 1974, at approximately 11: 00 a.m.

The failure is considered reportable under Item 2.1 (f) of the Technical Specifications.

- CONDITIO!;S PRIOR .

TO OCCl'RRENCE: Steady State Power, Routine Shutdown

!!Ot Sh:td'" a. 6 ton t i no eonn :nnngo Cold Shutdown Other (specify)

Refueling Shutdown Reacter shut-down in Ifelium Routine Startup atmosphere at atmospheric pressure.

The major plant parameters at, the time of the event were as follows:

Power PTR, 0 inith ELECT,' O IHlc Secondary Coolant Pressure O psig Temperature N/A F Flow none f/hr. -

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' Primary Coolant .

Pressure O psig )

0

• Temperature 135 F Core' Inlet I

• F Core OuticP.  ;

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Flow 0 #/hr. *

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P, age 2 DESCRIPTION OF ,

- OCCURRENCE: ,

. "B" standby generator unit (driven by "C" and "D" Diesel ' engines was being manually started and loaded for surveillance testing.

As the machine came to speed the,ro'on sta.rted filling with oil smoke from the exhaust system. The smoke was thich enough' that the ex'act source was unknown.

The operator shut the engines down, and notified maintenance, who determined that lube oil to the blower was leaking into the exhaust, on the West bank of "C" engine.

APPARENT CAUSE OF OCCURRENCE: Design Unusual Service Cond.

Jncluding Environ.

Manufacture X Component Failure Installation /Const . ,

Other (specify)

Operator Procedure .

The turbo-charger was dismantled and the following found: C (1) The inlet guide vanes on the exhaust side of the blower had two vanes broken off and missing.

(2) The impeller on the exhaust side was severely rubbed, with the blades f eld.ed over. .

(3) The drive shaf t was broken between the turbine (exhaust gas side) and the impeller (air-side). .

(4) The air side impeller was undamaged.

The danage was caused by interference between the turbine and the inlet vancs.. -

ANALYSIS OF OCCURRENCE:

It appears as if the inlet vanes cnt the exhaust gas side broke of f and entered the turbine, causing the damage to the turbine, and subsequent drive shaft breakabe.

The layrinth seal betucen the bearing and the exhaust gas side was

• severely' distorted during the rubbing of the turbine, allowing . lube oil to flow to the exhaust.

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The resulting smoke partially escaped the exhaust system, entering the

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C0bECTIVE .

.ACTIO:!:

The entire turbo-charger assembly was replaced with another unit.

l The turbo-charger on the East bank of "C" engine was opened to check for debris that night have f allen back f rom the exhaust af ter the units were stopped. Two small pieces were found and removed. .

FAIL 11RE DATA /SI!!ILAR REPORTED OCCURREl:CES

- The cause of the inlet vane failure is unknown. .

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Inspection of the turbo-chargers is scheduled on the annual inspection .

of the units.

No similar occurrences have occurred.

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PROCPE!ATIC I!! PACT No delay was caused by the failure.

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CODE I!! PACT Nonc i

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h~vh Frank Hathic, !!aintenance Engineer

m. _'

ederic E. Swart, Superintendent

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