ML061940439
| ML061940439 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 01/15/2003 |
| From: | Harrelson G Johnston Pump Co |
| To: | Vorpahl D Nebraska Public Power District (NPPD), Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0007, R4-5A16 | |
| Download: ML061940439 (2) | |
Text
JOHNSTON PUMP COMPANY Nuclear-Srace J Divisionr.
J" Ja uary. 15,2003 Cooper Nuclear Station
- P.O. Box.9$
'Brown sville, NE 683.22 ftRefereacz:- Service.Water Gland. Water Att'ention-Dwight Vorpah.
Fax: -4021925-5175 Per your reque.t, pleaset rev g:ewhe foo1ig QUESTION 1:
'ased on existing.Flowseivc vendor m.laflia guidance, the recomm..endea normal operating fow' ange for glan~d waxer. :injec:t~ionto th~e :ev Water.Pumps is 1.5 GPM io.6 GPM. NPPMdesires. to incmase the gland water eflw abo.ve :6 GPM in assu=re hat the 1 SGPM miimumismaintilned during Service Water system evoludonsristhat change the overall system flOw demand. What.is the tnaxiurn-recommcnded gland waver injection flow rate for long t.rm operation, and how does ýaiy increase in th.mraximum:flow impaict:recommended pump-componn~it/mnaiinteniance :intervals?
QUESTION I - RESPONSE:
Jo).nston Pum'p.Comp.n.y typically recommentds.hat g..i d.wt. 'law
.b..nintai.ned in a: rane.of 10.
GP.M.Uo. 1s. dPM For pumps of this design. 'Since this is in Increase:from the current flow. rate. the increued flow velocify has the.potential to increase the wear. ra*t.of ihebearings:anAdin:thie tnsionnut.to sleeve.cleaanco.-area..This w.ar is generally not excessive, based on. our experiencte -bat should be consideredl when.establishinig the pump overhaul frequency..
QUETSQN:2:*
As a follow-on'to Question T, what is the minimum.:aceptable gland iaier jection ýflow -forlong-term pump operation h:(Can t be: reduced to luss than :the current I.(GPM?)
QUESTION2, RESPONSE:
The. dcjign. -of thia pt..mp re quire.; gland Witer* flow -to ass.re 'ericieft" lubrication of the bearings A
minimhum gland water flow of 1.,S(PM iis aceptable fr laongterm.operaionn and.should not be redtced.
OUESIION'3-.
- WhI' is the irinpact on serice Water Pump co.nponri!ts and'p'mp operation. if gland wae floW is reduced to zc.eoi flowfor; a p..od of 30mimAtes, and then r*st*red to normal7 gUEsTION 3 -:RESPONSE:'.
With no gland water flow, the temperature of the Water in the: enclosing tube wiflincrease and the beatingo Wilt xgti be 6 Wkffkhtly luib.rlkt6c;. This wwould likdly ztin damage to iel bearings.
Howe~rc Wdo n.t antieipat.a catastr-ophic faihue f.the pump in hiss.cenario. Although the bearings.
- may be -dam aged, -we -would expect'thet the. pump -would contimit to pc*form its hydraulic'funtion: for at:
least"30 days (dependet on thue enDfiton of 'the pump prior to -the. event). Ifia shorttvrrn-mlos ogfgland
-2601 Puts 34th Svpt' 0 Chatteiiooge, Tennessee 31407 FAX 42316981.447 Telepboanv: 473I6"29-'14Ji HOT'l
-8lPO. 2V-201.6
- waiterflow Oezurs, the pump sh~ould be monitored ~ater ibe :e~v.nt to mreymie if vibration lvels :hve.
- in~.cosedd If so, the vibmtibh levtLs should be nionitored and he pupAould be siedtilcd fur overbmuJ.
- Pleae do note csiatc to call if you need furhcr 4iifortrration.
Regard.,
NuGleDr AcCOunt I1Jnaner