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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O public Service ('ompany CF Callwsde P. O.
Box 361, Platteville, Colorado 80651 May 12, 1975
.5 Mr. E. Morris Howard, Director
'N Nuclear Regulatory Commission
-f Region IV
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Office of Inspection and Enforcement 611 Ryan Plaza Drive
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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, D
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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 J' 8311020194 750512 gDRADOCK 05000267 PDR 56H pupy gg.gi. ggj;ing 7
o 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 of "B" standby generator) a broken clutch disconnect mechanism was j discovered which rendered the declutch mechanism inoperable. g This'is identified as an Abnormal Occurrence, per Section 2.1, para (f) of the Technical Specifications. CONDITIONS PRIOR TO Routine Shutdown Steady State ?awer OCCURRENCE: Routine Load Change Hot Shutdown Cold. Shutdown X Other (specify) Refueling Shutdown Steady state power of 1.3% l -f I l _ Routine Startup Mwth during "B" series ( startup testing. The major plant parameters at the time of the event were as follows: l l Rtr. 1.3% MWth f Power t Elcet. O MWe Secondary Coolant Pressure 1185 .Paig ' Temperature 300 'F 200,000 '#/hr. -Flow n Primary-Coolant Pressure 408 psig a
- F Core inlet
] Temperature-317.5 _ 'F Core Outlet- -Flow 69,,000 __#/hr.
(* f) R a.. 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: All other enh nes have already' been
- inspected and have no pin failuren.
i The pin will be replaced and the' frequency of lubrication increased'to keep'the collar from chattering. y
'l ge 3' ~ 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 / N 'C4(l Approved: 1 0< 1 C' FrpdericE.Swaet- -Superintendent Nuclear Production Public Service Company of Colorado ~
- --... t p p DISASSEMCLY AND ASSEMULY e v v REMO'VE COLLAR AND SLIDING SLEEVE ~ A w w.. ,"g '~~~ ,e start by: I I r a) remove clutch disc and hub assembly ~ '. h$ _. M Hose 'I y*,. ,1
- 1. Disconnect the grease fitting (2) from the clutch housing.
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- 2. Itemove the two collar bolts (3) and spacers
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- 3. Move"the clutch control lever forward until ff;
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- 4. licmove the other half of the collar (5) and
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- 1. Install the sliding sleeve on the shaft.
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- 2. Install the collar (3), collar bolts (2) and o ix,
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- 3. Connect the grease fitting (4) to the housi1g.
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- 4. Fill the. cDar and sliding sleeve with grease
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