ML20215F320

Safety Evaluation Supporting Proposed Preventive Maint Program for CRD & Orificing Assemblies,Per Util 860203 & 0916 Submittals

ML20215F320
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/17/1986
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20215F308	List: ML20215F305 ML20215F320
References
TAC-61066, NUDOCS 8612230353
Download: ML20215F320 (3)

Text

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3 w( (4p, UNITED STATES l

s, . , NUCLEAR WASHING REGULATORY TON, D. C. 20555 COMMISSION {

n o.<* j Enclosure t SAFETY EVALUATION BY THE OFFICE O R REACTOR REGULATION RELATING TO PREDICTIVE AND PREVENTIV C

R00 DRIVE AND ORIFICI PUBLIC SERVICE COMPANY OF COLO u

i-FORT ST. VRAIN NUCLEAR N GENERA D_0CKET No. 50-267

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I.0 I_NTRODUCTION a

Company of ColoradoBy letters dated February 3 and Sept er 19, 1986 version of their prop (osed revised predictithe of the licensee final program for the Control Rod r Drive cin and O ifive and preve the Fort St. Vrain Nuclear Generatin function is to assure proper insertiog Station.g Assemblies (CRD shutdown. The main CRD0A safety safe operation of the CRDOA.The n of the objective control rodsof theforprogram reactoris history of the CRD0A and It ison the experie based on the maintenanceureand failp Refurbishment Program which eence was gained compl from the tCRDOA d

in June of 1985

- The predictive and preventive maintenan performance components of inspection and maintenancece program includes of the CRD0A.

to the activities specified plant. Theseinactivities the Techwill i be performed ioperations 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 ve rogram for reviewed The staff's evaluation was limited n relia of the inspections and the level to adequate. ofdetermining preventi,if however,ble the nature op 2.0 for which considerably nmore backgrou d iIt did not inc n y EVALUATION nformation would be required.vidualy p

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The revised consists of two predictive parts: and preventiv '

e maintenance program for the CRDOA maintenance activities. predictive maintenance procedures and p program, data about the status of the CRD0AIn the predictive eventive e

main are collected.

These data come P

'2-from the 3/4.1.1, to surveillance 3/4.1.2 and 3/4 t obtain performance par.1.3, and fromests specified predictivethe determine maintenance scope ameters.p other tests echnical Specifica arts of The information the CRD0Aofisrequired onperformedhigh is preventiveobtained degree maithe sequently t from of det program observed, then a ntenance activitiec.o If a 3 discusses theptember modificatiIn 19, 1986 the complete February refurbishme justification for them submittal I

the Interim Technical ons made In the predictive to thepart Slicensee programdiscussed ands, the li e newly proposed provides e

previously reviewed and predictive tesnot ts.ofdithe program, the gs pecifications were and torques in the approved shim by the staff motmaintenance tests are m

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surements scussed The newly proposed becaus 5-

? for trending ocontrol or/ brake r dThe assembly licensee and gear ra in, conclu tof ges

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routine basis for drive performanceat shim motor wa f to malfunctionsmovementssteady state conditions on s' could be used wa

. Ccilectionng of data on a to S Similarly back could be reviewed against erformance thestablish base R is baseline pe. Changes due E

>x performanc,e the an torque delivered once-EMF additional important e at th motor par u voltage t@ts wo to rformante.

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drive performance rotor and the motory developed.

provided in the su. ameter in determining the Measurement

/ brake assemb o comprehensive approach inaccessible bmittals electro toanical monitoring/ and mech the determinedThe escriptionsoverall operatithat of they y is control rod represent s

components.

performed bThe licensee specified n onal status of normally

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the program.ased on the results from thumerous maintenance someperformed be Underat pres #1b d e Qormal circumstanc E

components occur times. e predictive maintenance pes req operations will be pe\ priorShould toesthe u thesched a maintenance l

significant de ortion of es willactiviti The preventivp mainten[

categories 1

,3ce inspection,imai activiti licensee identSfied the f l n enance,es

e. tgormed ance d sample analysis e

Since the purpoteback-EMF qperationsmeasusm(en.g., and ereplaceme wipeo lo activities:

t andsinsulation)testinsamples , torque determina The of inQction g of motor onvisual inspection, for motors, performed relative to somscomponent described by the licenss gn function, all iactivities is tocan perfo determine a given 4

ee in the September These 19 acceptance e criteria

, 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 The case, the preventive maintenance components of the activities CRD0A.specified by the licensee include all the major

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 proposed program for CRD0A status monitoring and trending during outages. and component inspection and replacement during plant operation, 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 on the CRDOA safety function. in sufficient time to preclude an adverse impact program to be acceptable. The staff, therefore, finds the proposed 4

Principal Contributor: K. Parczewski, PEICSB

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E Dated: December 17, 1986

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