ML20085L648
| ML20085L648 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 05/12/1975 |
| From: | Brey H PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| AO-50-267-75-10, NUDOCS 8311020194 | |
| Download: ML20085L648 (7) | |
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, public Service ('ompany CF Callwsde P. O. Box 361, Platteville, Colorado 80651 May 12, 1975 .,,
. .5 Mr. E. Morris Howard, Director Nuclear Regulatory Commission
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-f Region IV '
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Office of Inspection and Enforcement . . ,,,, ,,
611 Ryan Plaza Drive ' [,r
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Suite 1000 *^',#
Arlington, Texas 76012 REF: Facility Operating License No. DPR-34 Docket No. 50-267 _
Dear Mr. Howard:
Enclosed please find one copy each of Abnormal Occurrence Report '
No. @ U:267/75/1 @and Unusual Event Report No. 50-267/75/9, finals, submitted per the requirements of the Technical Specifications.
Very truly yours,
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.u.s s . ,f vq H. Larry Brey Superintendent-Operations Fort.St. Vrain Nuclear Generating Station ,
HLB:il ec: Mr. Angelo Ciambusso y aVI . .
l 8311020194 750512 gDRADOCK 05000267 J'
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9 _ ABNOPJ!AL OCCURRENCE REPORT DATE: May 7, 1975 OCCURRENCE DATE: May 1, 1975 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/75/10
^ Final l
IDENTIFICATION OF OCCURRENCE: I ' During a routine 6 months Preventive Inspection of K-9206X ("D" engine j of "B" standby generator) a broken clutch disconnect mechanism was g discovered which rendered the declutch mechanism inoperable. This'is identified as an Abnormal Occurrence, per Section 2.1, para (f) of the Technical Specifications. CONDITIONS PRIOR TO Routine Shutdown OCCURRENCE: Steady State ?awer Routine Load Change Hot Shutdown Cold. Shutdown X Other (specify) Refueling Shutdown Steady state power of 1.3% l ' I l _ Routine Startup Mwth during "B" series -f ( startup testing. The major plant parameters at the time of the event were as follows: l l 1.3% MWth Power Rtr. f t O MWe Elcet. Pressure 1185 .Paig Secondary Coolant 300 'F
' Temperature
-Flow 200,000 '#/hr. n Pressure 408 psig Primary-Coolant -
a Temperature- 317.5 _ *F Core inlet ,
]
'F Core Outlet-
-Flow 69,,000
__#/hr.
(* a . . f) R G O Page 2 DESCRIPTION OF OCCURRENCE: When the declutching mechanism of K-9206X was examined during a routine 6 months Preventive Maintenance laspection, one end of the pin holding the declutch-collar to the clutch me danism was found to be sheared off. The pin fits through one end of p' art (5), of the bottom picture, page 1 of attachment. Assembly is Part No. 6F6580, page 2 of attachment. There was no damage to any.other components. APPARENT CAUSE OF OCCURRENCE: Design Unusual Service Cond. Including Environ. Manufacture X Component Failure Installation /Const. ' Other (specify) e, Operator Procedure Through repeated operations the pin had failed. The collar has a tendency to " chatter" on the shaft, giving a. load cycling effect on the pin. Being in a het location, lubrication tends to flow off, increasing the tendency of the collar to " chatter". e ANAhYSIS OF OCCURRENCE: With one end of the pin sheared it is doubtful that the disconnect mechanism would have worked successfully if called on to do so. The collar would probably have " skewed" and may have resulted in damage to the fork mechanism. CORRECTIVE ACTION: i All other enh nes have already' been
- inspected and have no pin failuren.
The pin will be replaced and the' frequency of lubrication increased'to keep'the collar from chattering. , y
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FAILURE DATA / SIMIIAR REPORTED OCCURRENCES: None PROGRA!NATIC IMPACT:
.None CODE IMNCT:
None Recommended: Frank M. Mathie
,' Superintendent-Maintenance Fort St. Vrain Nuclear Generating Station i
/
Approved: 1 0< 1 C' - N 'C4(l FrpdericE.Swaet-
-Superintendent Nuclear Production Public Service Company of Colorado
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pv p DISASSEMCLY AND ASSEMULY v A REMO'VE COLLAR AND SLIDING SLEEVE ~ w'~~~ w.. start by:
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