ML20148B832
| ML20148B832 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/04/1979 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| IEB-79-15, NUDOCS 8001240147 | |
| Download: ML20148B832 (4) | |
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MISSISSIP'PI F OWER &'llGHT COMPAF,
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JACKSON. U,15 S l 5 5 f P D ' 30200 December 4, 1979 raoouction oom a ru c s, United States Nuclear ite ulatory Co Q iggion D'
pf fice of Inspection t. rnforcement J rgJgfg g
t!a shing t on, D.
C.
20555 us.
ATTENTION: Director, Division of Reactor Construction Increc-s
Dear Sir:
S i'B J E CI :
Grand Cuii.. a e,.
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P, ( chte! ' e b ': >.
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i AECM-79/;37
!!RC 10 Bulletin 79-15 " Deep Draf t Pur.p 0"ticiencit - ".'c.
J em various problems encountered with the operation of cit n.. r.
m and requests that certain design and operational infor L.an ie r o v. '. m for any pumps of this 1;eneral design.
There are currently three non-::SSS p,
.ps of the assir;ned to cach unit o f the Grand Gul f ::nclea r ';'... ion O.
S t andby Se rvi ce Wa te r Punp.s and one llPD Fe: cice
- ct the information for the ECCS rump. ' 'a s f e rw rJeJ :o :. o ;
i.rt.,
AECM-79/125, dated Nover:ber 1, 1979).
All of the subject pumps are manufactured 1-n
.?
Vertical Punp Division.
The S t andby Se re i ce '.: i t e r l'u:
'r.
(
Model VITX-SD-24x30 BLC-2 ra ted a t 12.000 CP': ad the ! W :-
,n
.cc wt, Un r
are Coulds Model VITX-SD-10x14 JllC-2 rated at 1300 GP:'
Pump dimensions are as follow.s 1)
Standby Service Watar Pun:p a.
Suction hel] diameter -
2'-9" b.
Distance from mounting flanc Lo centeri n of discharge flange -
1'-8" c.
Distance f rom mounting f]:,nge tc, bottoa of
..u t..
bell - 55'-0" 2) llPCS Se rvice Wa te r Pump n.
Suct-ion bell diameter -
1'-2" b.
Distance from mounting flange to centerline of pump 1'-0" c.
Distance from mounting flange to bottw of sec t ion bel I
5 2 ' - 10';"
e Of the deep draft pumps f urnished for the CC::8 only the..it 1
U.,
Pumps have been ol' orated.
All Unit 2 pumps have rec e i ve d
.s t e: le
.a i. t e:.an c e i
per the Coulds Pumps Inc. instruction manual.
8001240 I M Member Middle South Utilitac< Syctem
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MISSISSIPPI POWEi. Ik LIGHT COMPANY 2_
t A summary of the maintenance, "La rtup, ami test in ', o f : i.e-l. :
pumps is given below:
A)
Routinc !!aintenance 1.
SSW Pump "A" a)
Visual inspection b)
Fill with storage oil - Detehe 2;, 1"77 c)
!!cnner motor - Oc tober 25, 1977, \\pril
.'6,
.J7 October 31, 1978, ?t:iy 2, 1979 d) llookup heaters - De tober 25, 1977 2.
SSW Pump "11" a)
Visual inspection b) llookup heaters - October 25, 1977 c) tienger motor - October 25, 1977,.ipril 29, i?
October 31, 1978, Stiy 2, 1979 d)
Fill with storage oil - October 25. 1977 3.
IlPCS Service Water Punp a)
Visual inspection b)
Fill with storar,e oil - Octobs : 21, !977 c) llookup heaters - Oc tobe r 25, i"77 d)
Mepger mot or - Oc tober 27, 1977, t'
tei.c: i.. I t' ! :.
fla y 2, 197S e)
Rotate - August 3, 1979, ::0vcel,er 1 1979 B)
Startup 1)
SSW Pump "A" - Pump has been run approx.
J. haar 2)
SSW Pump "13"
. Pump h:is been run appro:.:. 73 :.ci.rn 3) llPCS Service Wa ter Pump - Pump hat, not beci. run C)
Testing 1.
SSW Pump "A" a)
Satisfactory vibration data was taken with purp o;.
recirc at approx. 10,000 CP.'t b)
Pump performance checked.igainst f l e.. curve 2.
SSW 1,' ump "B" a)
Satisf actory vibration data taken with pur..p en. recire at approx. 10,000 GPM b)
Pump performance checked against flow curve 3.
IIPCS Service Water Pump a)
No testing performed
MISSISSIPPI POWEl' & LIGHT COMP ANY D ooD oD 3-}
3_
.b.
oc o
a 3
Operational problems and major repair el for u, a:.: oc i.:.s
! h t h.
Unit 1 pumps are summarized as follows.
A)
Operational Problems 1.
SSW Purnp "B" a)
On initial purnp run the mechanic.tl seal fa11cd due to improper installation.
b) on subsequent pump run after the w i...!c.
had been replaced, the new nea l 1 caked ar;.re ni-mately 1/4 cup / min.
i 1
c) l)u ring addit iona l operat ion of ' t he pi was drawing current above the :.e. '/ i c e a
pump was shut dot:n a f te r t h i s finding
.i a:a:.
.1-d)
The pump was operated while su'ncm' low pil volume of water (due to additiaa
.9
. ' c e:
amounts of sulphuric acii!) causin.; corro a
parts of the pumps.
Corrosion of the b as' under the lineshaft coup] Ing re t a : r..-r-: e i < /e screw resulted in vertical displacen, si t.,
p t.m' lineshaft.
'lhis displaccrent led to t !.
i.
wear ring and the lower casi:
- 1. a s ri:
u:n: '.
t s
c)
Disassembly and inspection of tne pu ::s rere.!ca t he lower cas in:; vear ring hasi f u.
Le
.:pel!s wear ring causing the overleadi;.
the or 2.
I o operational problems have been experienced u.
- tne re-maining pumps.
B)
Major Repair Efforts - SSW Pump "1;"
The pump was sent back to t.he f actory.m ; t he purp v. idor i t ::a:,in-ing it to determine the extent of repair ru;ui red.'.:d t he e: <.c t cauae o f the wear ring f usion.
A summary of the history of operation e the Lt.a 'Jn i t 1W' p u':.p s in pre-r sented below:
A)
Operability 1.
S SW l'u mp " A" a) lias been operable since Oc tober 29, 1979 b) lias been run 3 times since the above date 1) 2.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> - recirc - 10,000 cp.'1 2)
I hour - at a p p ro:;. 11,000 Ci"4 3)
.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> - at approx. 11,000 ci'"
c) lias not been run at rated flow
MISSISSIPPI POW El ' & LIGHT COMPANY
+
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4 2.
SSW Pump "ll" a)
Was first operable on September 12, l'J 79 b)
Was run 4 times before pump f ail. ire 1)
I hour - rec ire - 5,000 GP:
i 2) 70 hours8.101852e-4 days <br />0.0194 hours <br />1.157407e-4 weeks <br />2.6635e-5 months <br /> - recirc - 5,0C0 CP::
3)
I bour - recirc - 7,000 GP:t 4)
I hour - recire - 10,000 Gi"*
c) lias not been run at rated fles.
3.
llPCS Service Water Purp This pump has not been ope:oted te d.ac.
Yours truly,
,/
/
1..
F.
Dale Nuclear Project '.. i n a r e t RTE /JDR:pa bec:
Dr.
D. C. Gibbx cc:
!!r. !!. L. Stampley Mr. A. Eaccaria Mr.
R.
15. McGehee I'Ir. J. !i. Ward Mr. T. B. Conner Mr. D. :1. Lake Mr.
R.
L. Scott Mr. J. P. O'Reilly, Director McCau3 y, Jr.
h Mr. J.
P.
Of fice of Inspection !. Enforcement M#' W' l' I;"il U. S. Nuclear Regulatory Commission Mr. T.
E.
Reaves Region 11 Mr. P.
W.
Sly 101 Ma riet ta St reet - Suite 3100 Mr.
C. K. McCoy i
Atlanta, Ccorgia 30303 File Mr. Victor Stello, Pirector Division of Inspection and Enforecnent U. S. Nuclear Regulatory Commission Washington, D. C.
20555 t:
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