ML20236A869
| ML20236A869 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 03/07/1989 |
| From: | Callan L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Morris K OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8903200196 | |
| Download: ML20236A869 (2) | |
Text
{{#Wiki_filter:,. % M ^? 9 ') v,, } v. -. M. -{ lggg. i 4 In Reply Refer-To: i H Docket: 50-285' l -l' 1 -0maliaPublicPower. District ATTN: Kenneth J.. Morris, Division. Manager- _ Nuclear Operations '1623 Harney' Street Omaha, Nebraska 68102 Gentlemen: Thank you for your letter of January 9,1989, documenting the telephone conversation held on December 21, 1988, between OPPD-and NRC Region IV-personnel. During this. conversation, OPPD's decision to defer plans to . overhaul the motors in containment cooling fans VA-3A, -38, -7C, and -70 J was discussed. This decision was contrary to the.information provided-to our. 9 inspector during;the review and closeout of Unresolved Item 285/8705-13. It is our understanding that this deferral was evaluated by OPPD based upon new-your contractor. J infonnation provided by Joy Manufacturing, the equipment vendor and a review by . p 3ased on this telephone conversation and our review of your. letter,~we have no further questions at this time on your proposed actions and Unresolved q Item 285/8705-13 viH remain closed. Sincerely, l Cl h m!. ado 4 L. J. Calian, Director Division of Reactor Projects cc:: Fort Calhoun Station ATTN: W. G. Gates, Manager P.O. Box 399 Fort Calhoun, Nebraska 68023 Harry H. Voigt, Esq. LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, NW .( Washington, D. C. 20036 Nebraska Radiation Control rogram.Di or h af D RIV:RI%d C:PSS D P JBoardman/cjg TStetk1 JL ilhoan LJ(allan 7 3 3/89 $/h/89 y /7 /89 g / 5 /J /89 I { 8903200196 890307 ( PDR ADOCK 05000293 Q PDC g
y- _.A. c, > "l.; t, e, c 'a. q ';OmahaPublic'PowerDistrict 1 q bec to DMB (IE01)' -j ..q .bcc distrib. by RIV: Ej !..Dt Martin,-RA' ' Section Chief (DRP/B). -RPB-DRSS .RIV File MIS System DRP RSTS Operator-Project Engineer, DRP/B Lisa Shea, RM/ALF DRS P. Milano,LNRR Project Manager-(MS: 13-0-18) RRI J. Boardman iT. Stetka; 4 l 4 l i .1 1 i w- -_-.-____---____----_._._----_-A. - - - _ _ - - - - - - - _. ~. _ .___._____.__-,___________1_ ,,_aw__ __.a -_a,
I EL**- p 1 = - a. e..- A [* f ' i Omahe Public Power Olstrict 1623 Hemey Omana. Neo: ssma 68(02 2247 j .02/s364000 January 9, 1989 LIC 88 1115 l U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station P1-137 l 1 Washington, DC 20565 Docket No. 50-285 R, L. Andrews) f
References:
1. Letter from NRC (J. E. Gagliardo) to OPPO (/37-05-1 2. dated May 8, 1987 (Inspection Report 50-285 Letter from NRC (L. J. Callan) to CPPD (K. J. Morris) September 19,1988(InspectionReport 50 285/88 25) 3. { Gentlemen: Planned overhaul of Containment Coolirg Fans VA 3A, VA 35, VA-7C,
SUBJECT:
and VA 70 The purpose of this latter is to inform you of Omaha Public Power District;s (OPPD's) decision to alter plans to remove the containment cooling fan ) Recent additional information has resulted in Calhoun Station for overheui, the decision to defer actions. 21, 1988 between OPPD licensing A telephone conversation was held on Decemberand engineering OPP 0's decision to Harrell, Fort Calhoun Station Senior Resident Inspector. defer discussed. 285/8705 13. In August 1988, the NRC reviewod the status of Unresolved Item The Lubrication of Containment Cooling Fan Motors and Limitorque coerators. A 50-285/68-25. A concern wt.s I review was documented in NRC Inspection Report expressed that the periodicity of lubrication of containment cooling fan m would not allow operating hours plus the time required for PosteL0CA fan i This concern Was fostered by information provided to the operation. Inspector during the inspection. The statt*s update of Unresolved Itain standing of the situetion at the time, concluded with a statement of verba t to the manufacturer for oyerhaul during the 1988 refueling outage. 8705-13 / The overhkul issue was reevaluated by 0 PPD engineering and maint Primary data psed in the reevaluation was new information provided b I the aavipment vendor, and c review performed by Sargent & P Manufacturing,ing is a summary of the infonsation used in the dec<ston to de Follow Lundy. overhaul of the cooling fan units. i j 5*u* 4,al* wawona w
(, 4i U'.' S. Nuclear Regulatory C9amisston LIC 88-1115 .Page.2
- 1. 'A more recent reevaluation of the bearing life by.the Vendor (
l Manufacturing)blished that the VA-3 motor bearings should last throughout The Minimum Expected Life for the 1988) has esta the projected plant operating life. l outboard bearing is 2.93 stilinn hourst the Minimum Expected Life for the There times are well in excess of the . inboard bearing is 250,000 hours. The renuits of the Joy study have also been expected fan operating time. reviewed and supported by Sargent & Lundy, OPPD reviewed the lubricatic.n frequency and has implemente 2. lubrication schedule. These conditions crNrespond to the H cool-(less than 100* F) environment. vendor definition of " Standard" envircnnent. The VA-3 fans operate on a cycled basis between VA-3A and VA-38. vendnr prescribed lubrication interval is now of,e year for this combinati OPPO has established a lubrication l of environment and operating time. interval of nine months for the VA-3 fans. OPPD has l The VA-7 fans are each operated less. than 50 hours j based on the itght duty cycle of the equipment. The revised lultrication schedule was conservatively estabitshed.<se that i sufficient time would be available for Post-LOCA operation. With regard to evah.aths prcjected bearing life on the basis of past lubrication practices, B-10 for L-10). bearing life / Because of the ) correlated to past lubrication amount ar21 interval. relatively smaH amount of lubrication required in anti friction ball hearings, the optimum lubrication amount and freceaney for a bearing Civen sat of operating ar.d load conditions is probably as much e I basis as it is scientific. f 1 The decision 'to overhaul all four units would reint i 4. Also, significant risk involving personnel and reliability function. equipment along with additional radiation exposur$ gain reliability of questionable value. Baseline vioration osta for these motors will be taken a Data outage with sucsequent readings taken during succ 5. motor /beaHng 1ife. l
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I W. s. Nucloak Regulatory Consission At!Ce881115-j 4' D Page 3 OPPD maintains two spare motors onsita for the containment cooling units.Our rev 4 i Periodic maintenance is perfomed on these units. requirements was extended to cover the spare motors. Past lubrication Procedures have been practices have probably resulted in over lubrication. obtained from the motor manufacturer (Reliance Electric) f This work will be considerations for long-term storage of these motors. accomplished post-outage. l It is our fim belief that the dwision to defer plans to overhaul the ~ containment cooling fans is prudent, in keeping with a the. plant. If any further information is required, please contact us. Sincerely, l e / tris Division Manager Nuclear Operations KJM/sa LeBeeuf, Lamb Leiby & MacRae R. D. Martin, NRC Regional Meinistrator c: P. D Milano, NRC Project Manager P. H. Harrell, NRC Senior Resident Inspector t i. j *f i.. 2 h A .}}