ML20215F320
| ML20215F320 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 12/17/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20215F308 | List: |
| References | |
| TAC-61066, NUDOCS 8612230353 | |
| Download: ML20215F320 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION l
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WASHING TON, D. C. 20555
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j Enclosure t
SAFETY EVALUATION BY THE OFFICE O RELATING TO PREDICTIVE AND PREVENTIV R REACTOR REGULATION R00 DRIVE AND ORIFICI PUBLIC SERVICE COMPANY OF COLO C
FORT ST. VRAIN NUCLEAR GENERA N
u D_0CKET No. 50-267 i-
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I.0 I_NTRODUCTION a
Company of ColoradoBy letters dated February 3 and Sept version of their prop (osed revised predictithe licensee er 19, 1986 program for the Control Rod Drive and O ifive and preve of the final the Fort St. Vrain Nuclear Generatin r
cin function is to assure proper insertiog Station.g Assemblies (CRD shutdown.
The main CRD0A safety safe operation of the CRDOA.The objective of the program is n of the control rods for reactor history of the CRD0A and on the experie It is based on the maintenance and failp Refurbishment Program which was compl t d nce gained from the CRDOA ure ee The predictive and preventive maintenan in June of 1985 performance of inspection and maintenancece program includes components of the CRD0A.
to the activities specified in the Tech i These activities will be performed ioperations plant.
accomplished and the criThe licensee outlined in the submittaln maintenance operations. teria to be met in performing the preve its adequacy toward achieving safe a dThe staff has reviewed The staff's evaluation was limited ve n relia rogram for of the inspections and the level of preventi, however,ble op to determining if the nature adequate.
for which considerably more backgrou d iIt did not inc EVALUATION nformation would be required.vidual p n
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The revised predictive and preventiv consists of two parts:
e maintenance program for the CRDOA maintenance activities. predictive maintenance procedures and p program, data about the status of the CRD0AIn the predictive main eventive e
are collected.
These data come P
'2-from the surveillance t 3/4.1.1, 3/4.1.2 and 3/4 obtain performance par.1.3, and fromests specified to predictive maintenance p echnical Specifica determine the scope other tests ameters.
The information the CRD0A is performedhigh degree of de arts of obtained from t of required preventive maithe program on is sequently t observed, then antenance activitiec.o discusses the modificatiIn the February 3 complete refurbishme If a ptember justification for them 19, 1986 the Interim Technical Slicensee discussed ons made to the program ands, the l submittal In the predictive part I
provides e newly proposed previously reviewed and tes ts.of the program, the pecifications were not di e
predictive scussed becaus approved by the staff and torques in the shim motmaintenance tests are m gs The newly proposed surements for trending control r dThe licensee conclu or/ brake assembly and gear tof
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5-drive performanceat shim motor wa routine basis for ra in, ges
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o to malfunctionsmovements could be used to steady state conditions. Ccilectionng wa
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f could be reviewed against thestablish base on s' of data on a Similarly erformance back S
performanc,e once-EMF voltage t@ts wo is baseline pe.
Changes due R
the torque delivered at th rformante.
>x an additional important par E
drive performance e motor u
to rotor and the motory developed.
Measurement o 4
ameter in determining the / brake assemb provided in the su.
bmittals and determinedThe s I
comprehensive approach inaccessible electro / mech escriptionsoverall control rod y is to monitoring the operatithat they represent of performed bThe licensee specified n anical components.
onal status of normally the program.ased on the results from thumerous maintenance be performed at pres #1b d Under Qormal circumstanc
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e predictive maintenance pes req E
some components e
es the maintenance activiti occur times.
operations will be pe\\ prior to the sched l Should a significant de ortion of categories 1 inspection,imai tgormed d u
es will The preventivp mainten[
,3ce licensee identSfied the f l n enance,es activiti e.
ance qperations and replaceme sample analysis Since the purpoteback-EMF measusm(en.g., wipeo lo e
e t andsinsulation)testinsamples, torque determina activities:
The performed relative to somscomponent can perfo visual inspection, of inQction g of motor on for s gn function, all iactivities is to determine
- motors, described by the licens ee in the September 19 acceptance criteria a given These 4
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, 1986 submittal. criteria 'were e.
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Maintenance operations for different components, as described by the licensee, are limited to cleaning and lubrication.
straightforward procedure and is clearly specified by the licensee.This is a rela Replacement of components is implemented either when they reach the end of their design life, or when inspections indicate a need for their replacement because of the degree of their deterioratien.
decision to replace is based on specific criteria.In the later case, the The preventive maintenance activities specified by the licensee include all the major components of the CRD0A.
3.0 CONCLUSION
S Based on t'ne considerations discussed above, the staff concludes that the proposed CRDOA predictive and preventive maintenance program provides a comprehensive approach to monitoring and maintaining the operational status of usually inaccessible electro-mechanical components in order to ensure their reliability.
This conclusion is based on the licensee's
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proposed program for CRD0A status monitoring and trending during operation, and component inspection and replacement during plant outages.
The staff further concludes that once the program is implemented, the licensee will have an effective method for monitoring the operational condition of the CRD0As.
This program will also identify potential malfunctions in sufficient time to preclude an adverse impact on the CRDOA safety function.
The staff, therefore, finds the proposed program to be acceptable.
4 Principal Contributor:
K. Parczewski, PEICSB
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E Dated: December 17, 1986
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