ML20101U042

From kanterella
Jump to navigation Jump to search
CRD & Orificing Assembly Proposed Preventive/Predictive Maint Program
ML20101U042
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 01/31/1985
From: Eggebroten J, Novachek F
PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20101U035 List:
References
PROC-850131, NUDOCS 8502060545
Download: ML20101U042 (12)
v • d • e


Text

-

ATTACHMENT 3 TO P-85040 CONTROL ROD DRIVE AND ORIFICING ASSEMBLY PROPOSED PREVENTIVE / PREDICTIVE MAINTENANCE PROGRAM Prepared by: [ (

Jtur Eggebroten Technical Services Engineering Supervisor Approved by:

Frank X Novach h Technical / Administrative Services Manager Public Service Company of Colorado Fort St. Vrain Unit #1

~~ 8502060545 850131 PDR ADOCK 05000267 P PDR

e .

2 l

l

'I. ABSTRACT-A review of source information to identify potential preventive l maintenance activities has been completed, and aspects of that program are being proposed. The detailed implementation of some parts of the program will be dependent -upon the results of currently underway Engineering studies. Evidence sugg'ests that a preventive _ maintenance -schedule based on the scheduled refueling cycle for normal. service rods (i.e., replacement of

. rods in refueling regions with refurbished assemblies), and for the regulating rod, in conjunction with predictive maintenance, ,

.is appropriate. Of.particular importance is the monitoring of shim motor performance, to identify and schedule maintenance other than normally scheduled maintenance.

II. DESCRIPTION OF TECHNICAL REVIEW .

A review of a variety of source information on Control Rod Drive and Orificing Assemblies (CRD0As) has been performed to identify aspects of maintenance for which preventive maintenance

consideration would be appropriate. The following sources of information were used:
1. Operations a'nd Maintenance Manual (GA-9806, May 1977)
2. ~ Completed Plant Trouble Reports from the STAIRS database
3. Open Station Service Requests (Plant Trouble Reports)
4. Plant Maintenance Personnel
5. Plant Maintenance Engineering Personnel
6. Proposed Modifications
7. Operational. Experience
8. D-1201 Drawings (DesignDrawings)
9. Surveillance Requirements 10.- Engineering Development Studies From this variety of information, a set of potential preventive maintenance activities has been identified. Each of these is
being' subsequently considered individually with regard to t

component failure history, service life, predictive maintenance-(PDM) test potential,-and other possibilities, to identify a set of preventive maintenance (PM) activities that.is appropriate.

A q

_ _ _ _ __ - . _ .__ - - ,,w. , , , ., __.

l 3

III. PREVENTIVE MAINTENANCE (PM) PROGRAM -

GENERAL OVERVIEW OF POTENTIAL PM ACTIVITIES l

A. SHIM MOTO.R/ BRAKE ASSEMBLY Visual Examination 11.

a. Pinion gear
b. Motor bearings
c. Brake pads
2. Test - as left
a. Dynamometer

.b. Torque to rotate - removed from CRD0A

c. Torque to rotate - installed on CRDOA
d. Back-EMF (scram generated braking voltage)

. 3. Shim Motor Bearings

a. Clean / replace as required i
4. Electrical
a. Megger motor (insulation test)
b. Dynamometer (load capability)
c. Megger brake windings (insulation test)
8. DRIVE TRAIN
1. Visual Examination of exterior
2. Torque - delivered (rods on) measurement
a. Torque to rotate - motor installed on CRDOA -

through shim motor rotor shaft (This is the same as. item A.2.c, above)

b. Back-EMF (scram generated braking voltage)

C. CABLE

, 1. Visual examination

2. Surface wipe analysis
3. Replace one cable'every.3rd refueling cycle to allow:

i l i

a. Detailed visual examination l

_b. Meta 11ographic examination

[ c. Pull test 1

I I

4 D. RESERVE SHUTDOWN SYSTEM

1. Hopper
a. Visual examination ,
2. Material
a. Sample removal - visual examination b ', Samole analysis - select CRDOAs
3. Pressure switch-
a. Functional test - Surveillance Requirement
4. -Valves
a. None
5. RSD System -

d

.a. Functional test (blow rupture disk) -

Surveillance Requirement E. POSITION POTENTI0 METERS - R00 PAIR

1. Visual Inspection
2. Test
3. Replace based on service
a. Number of shims
b. Rod travel
c. Anomalous indication
d. Other service parameters F. LIMIT SWITCHES (2 each -slack cable, in, out, retract)
1. Visual Inspection
2. Test
3. Replace based on service 4
a. Time in reactor
b. Moisture
c. Anomalous behavior i

[ g t

  • 5 G. ORIFICE DRIVE MOTOR ASSEMBLY
1. Visual
2. Bench Test
3. . Clean and lube (dry)
4. Replace support nut H. ORIFICE DRIVE LEAD SCREW ,
1. Visual - as found
2. Clean physical
3. Dye Penetrant testing
4. Lubricate and exercise I. LOWER SEAL
1. Visual
2. Clean physical, wipe
3. Clean - body housing J. PRIMARY SEAL - 600 ASSEMBLY
1. Visual - both surfaces
2. Clean - wipe
3. Clean - mating surface, penetration and 600 Assembly
4. Lifetime evaluation possible replacement K. PRIMARY SEAL - 200 ASSEMBLY
1. Visual
2. Clean - wipe
3. Clean - mating surface-  !

i

4. Lifetime evaluation possible replacement j l

L. CHECK VALVES - (RSD, CRDOA Purge)

1. Visual l

.2. Test 1

o

  • 6 M. CABLE SEALS
1. As determined by observed elevated / abnormal housing temperatures N. ORIFICE MOTOR PLATE SEALS
1. Visual
2. Clean - wipe '

O. WINDOW SEALS

1. Visual
2. Clean - wipe
3. Gasket material - evaluate for lifetime P. MCC CAPACITORS
1. Test
2. Shelf life / service life evaluation Q. ELECTRICAL - POWER
1. Megger shim motor (test insulation deterioration)
2. Bench test shim motor (load capability) i
3. Megger brake windings (test insulation deterioration)

Bench test brake solenoid (load capability) 4.

5. Bench test stepping motor (load capability)

R. ELECTRICAL - INDICATION

1. In/Out Limit Switch Function - test redundancy when made up
2. Slack Cable - test redundancy when made up
3. Full retract - N/A - normally not both made up S. BOLTS - EXPOSED TO PRIMARY COOLANT
1. Visual on selected bolts

% 5

T. ABSORBER STRINGS

1. Visual
2. Lifetime evaluation possible replacement
3. Shock absorber only replacement IV. PREDICTIVE MAINTENANCE (PDM) PROGRAM A. SHIM MOTOR / BRAKE ASSEMBLY AND GEAR TRAIN ,
1. Wattage - outward shims - as found/as left t inward shims - as found/as left t
2. Back-EMF voltages -

during scram (and/or equivalent) - as found/as left

3. Delivered torque at motor - as found/as left
a. After CRD removed from PCRV during PM
b. Static - complete rotation, both directions
4. Scram times (SR 5.1.la-A)

, a. Gross performance parameter (really monitors motor variation if done with constant capacitances)

5. Rod drop rate (SR 5.1.lb-M)
a. More sensitive than Item 4., but less than Item 2.
6. Torque to rotate motor / brake assembly - as found/as left

! a. Removed from -CRDOA (hence reflects motor bearings only)

b. Static - complete rotation i

J

    • ~,

, ..n- r - , , - ,

ATTACHMENT 4

' ~4*

- TO P-85040 FORT ST. VRAIN STATION CONTROL ROD DRIVE AND ORIFICING ASSEMBLY REFURBISHMENT PROGRAM RADI0 ACTIVE WASTE HANDLING ANALYSIS .

T .

2 PUBLIC SERVICE COMPANY OF COLORADO FORT ST. VRAIN NUCLEAR GENERATING STATION 4

PREPARED BY: bdwc/rA.dcrtse

Frederick J.'iorst Support Services Manager /

Radiation Protection Manager

.5 l

1

> Ow FORT ST. VRAIN STATION CONTROL ROD DRIVE AND ORIFICING ASSEMBLY REFUR8ISHMENT PROGRAM RADI0 ACTIVE WASTE HANDLING ANALYSIS Introduction The radioactive waste genera ted as a result of the Fort St.

Vrain Control Rod Drive Refurbishment Program will fall into two general types: relatively low activity, high volume waste such as anticontamination clothing, ~

g loves, wipes, cleaning materials, reserve shutdown material, and the like; and relatively high activity, low volume waste including the control rod clevis bolts, cable and fittings, and control rod cables.

a The handling methods for each of the two waste types will differ and are described below.

Low Activity, High Volume Waste For the most part, 'this waste will be handled in accordance with existing plant procedures relative to collection, transport to

! the on-site compacting building, compaction, and staging prior to shipment off-site for disposal. At the current time, Fort St. Vrain does not have an approved low level waste disposal program satisfying 10CFR61 requirements. This was identified in NRC Inspection 83-28 as Open Item 04 and is being tracked as Corrective Action Request (CAR)84-005 by PSC. An approved program will be in place prior to shipment off-site for disposal. Currently the PSC Office of Executive Staff Assistant is evaluating via CAR 84-006 the Fort St. Vrain on-site waste staging facilities (NRC Inspection 83-28, Open Item 05) to determine an acceptable activity content for staging. At no time will the activity placed in the staging area exceed the acceptable quantity as determined in response to CAR 84-006.

Reserve shutdown material will be handled on a case-by-case basis to ensure proper handling and staging techniques are followed.

ATTACHMENT 5 l

.-. TO P.85040 FORT ST. VRAIN STATION CONTROL R00 DRIVE AND ORIFICING ASSEMBLY INTERIM SURVEILLANCE PROGRAM PUBLIC SERVICE COMPANY OF COLORADO FORT ST. VRAIN NUCLEAR GENERATING STATION PREPARED 8Y: -

o//

Charl'es~H. Fuller Station Manager

-e r

- s um id: 1 .r.. n

Elements of Test for Partially Inserted Rods

1. Obtain analog and digital position.
2. Verify " Rod Out", " Rod In", and " Slack Cable" lights are not lit.

'3. During the drop, obtain back EMF data.

4. Obtain analog and digital position.
5. Withdraw the rod to its previous position.
6. Obtain analog and digital position.

Elements of Test for Fully Inserted Control Rods

1. Obtain analog and digital position.
2. Verify " Rod In" light on; verify " Rod Out" and " Slack Cable" lights off.

Elements of the Test for all Control Rods

1. Obtain CRD motor temperatures.
2. Obtain purge flaw if installation on individual rods can be achieved pr or to startup.
3. Verify that to " Slack Cable" lights are lit.

Discussion The obtaining ard comparison of analog and digital position indication confi rms the sati sfactory operation of the associated potentiemeters. The acceptable deviation between the indication will be 10" which is well within the

deviation assumed in the FSAR for different control rods within a group (2 + 1 foot per Fage 3.6-19, Page 7.2-9, and Section 7.2.2.1). Deviations greater than 10" will be resolved by calibration if possible, or comparison with operable position switch indication. If this is not successful appropriate corrective action will be taken to ensure compliance with Technical Specifications.

4 A rod drop of approximately 10" is performed by deenergizing the control rod brake for a specified time. This portion of the test confirms that the brake assembly is operating properly, and that deenergi:ation (such as during a scram) will in fact result in brake release. .

Quarterly Surveillance Objective - To supplement information obtained on the weekly surveillance; to verify redundancy of selected control rod position limit switches.

Methodology - Check redundancy.

Elements of Test for Fully Withdrawn Rods

1. Determine which of the two redundant " Rod Out" limit switches has actuated.
2. Bypass this switch to allow further rod withdrawal.
3. Withdraw the rod further until the second switch actuates.
4. Confirm operation of rod motor deenergization interlock with second switch actuation.

f 5. Return rod to original position and remove bypass.

, Elements of Test for Partially Inserted Rods Not Applicable - Partially inserted rods will not have " Rod In", " Rod Out", or " Slack Cable" lights lit. Weekly 4

surveillance will compare analog and digital indication.

Elements of Test for Fully Inserted Rods i Not Applicable - Technical Specifications prohibit the withdrawal of these control rods out of sequence. Such I withdrawal would be necessary to confirm limit switch redundancy. The weekly surveillance will compare analog and digital indication, and that the control rod " Rod In" light is lit. Fully inserted rods are already performing their design function.

l

- -

Retrieved from "https://kanterella.com/w/index.php?title=ML20101U042&oldid=2799218"