ML19324B502
| ML19324B502 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 09/10/1979 |
| From: | William Cahill CONSOLIDATED EDISON CO. OF NEW YORK, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| IEB-79-15, NUDOCS 8911060467 | |
| Download: ML19324B502 (4) | |
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William J. Oshill, Jr,j j
v.co Premie,ni Ifk 1
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Consolidated Edison Company of New Y
- Inc, s -
4 Irving Place, New York, N Y 10003 W--
Telephone (212) 460 3819 s
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September 10, 1979 Indian Point Unit Nos. 1 and 2 Docket Nos. 50-3.
Sd-247 s
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U.
S.' Nuclear Regulatory Commission #
l0ffice-of Inspection and Enforcement
'Wcshington,-D.
C.
20555 C.
Attention:
Director, Division of Reactor Construction Inspection
~Daar Sir, l'
This letter is being provided in response to a July 11, 1979 letter Thich~ forwarded IE Bulletin No. 79-15.
This^ bulletin requested in-L formation regarding deep draft pumps in safety relate'd systems in
- the Indian Point Unit Nos. 1 and 2 plants.
i L{.Vithrespect to. Indian Point Unit No. 1, the unit was shutdown on
~ Oct_ober 31,. 1974~ and is presently in the defueled condition awaiting o decision'by the Company whether or not to install an emergency c..
core cooling system'.in accordance with the. Commission.'s regulations.
The.information requested in the bulletin will be provided if an
.cffirmative' decision is reached to return the unit to service.
~
With respect to; Indian Point Unit No.
2, the requested information l'
for deep draft. pumps in safety related systems is presented below:
'Sarvice Water pumps
'1; Number
-Six 2.
Manufacturer
-Layne-Bowler Model
-350-SW20K2 Vertiline Life-Line A (vertical 3-stage centrifugal)
Capacity
-5000 gpm at 220 TDH Plant application
-Supply river cooling water to various heat loads in both the safety related and non safety related portinns of the plant.
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Overall pump dimensions 38 1/2' length, excluding motor 14" suction and discharge l
E flanges t
y 20-7/8" max.
0.D.
of bowl assembly i
i 1 15/16" shaft diameter j
36"'sqare and 44" square mounting j
plates
- approximately 29" height, suction j
to discharge 28" minimum submergence 13" diameter of impeller j
4 and 5.
The summary of startup, testing, routine maintenance history, operational problems and major repair efforts are listed below t
1
.for the service water pumps:
l Pump I
a)
Darage to pump shafts (3 occurrences).
shafts were replaced; with new shafts new upper and lower wear rings (bowl) were made.
(Excessive vibrations were noted just prior to damage of pump shafts).
b)
Shaft bearings replaced, c)
Pump seals replaced.
(
d)
Packing rings replaced, stuffing box repacked.
- 6.
The longest interval _that each pump has been available for i
operation without corrective maintenance appears below.
Longest Operating Pump No.
Interval 21 1 yr. 10 mos.
22 9 mos.
23 2 yrs. 7 mos.
24 3 yrs. 8 mos.
25 2 yrs. 2 mos.
26 1 yr.
8 mos.
a r
The data for number of cycles of operation, duration of cycles, etc. is not in a readily accessible form.
Four (4) new pumps fabricated by the Aurora Pump Company are availabe for installation at the Indian Point Unit No. 2 plant.
The four (4) new pumps have improved features c
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j which are eypected to reduce maintenance and incrpase f
the operating interval; these new pumps will be placed j
into service on a maintenance schedule basis.
The Aurora i
Pump Company has acquired the Layne Bowler Co., which was The pump improve,-flou the manufacturer of the original pumps.
characteristics remain unchanged, and the d maintenance features are listed below:
a)
Hard surfaced (colmonoy) packing box sleeves added to improve wear resistance.
-b')
' Type 304L stainless steel impellers replacing bronze impellers to improve resistance to erosion and permit welding repairs.
c)
Column pipe casing wall thickness increased to 1/2" from 3/8" to reduce vibrations.
d)
Open line shaft design changed to enclose line s
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shaft'with colmonoy hard surfaced shaft sleeves and cutless fluted rubber bearings.
e)
Laval separator used,for bearing water filtration is nickel plated inside and outside.
Installation valving and piping is stainless steel.
For normal power operation, at least one (1) service water pump.of three on the essential header, and at least two (2) service water pumps of three on the non-essential header,.are operating continuously.
The operation of the service water system during normal power operation is in effect a long term-continuous test of the service water pumps.
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-4 i
'Rheirculation' Pumps
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1 Number Two 2.
Manufacturer Ingersoll Rand Company, Cameron Pump Division
(
)
Model 24 APK - 3 Stage t
o capacity 3000 GPM at 350 TDH l
Plant application Recirculation inside containment of primary coolant from the re-circulation sump to RHR system and into the reactor vessel fol-lowing a postulated LOCA.
3.
Overall pump dimensions Approximately116' length, ex-cluding motor 36" square mounting plate 23" max.
0.D.
of bowl assembly 2 3/4" shaft diameter 18 3/4" diameter of impeller f
~ 4, ' S & 6-The recirculation pumps are not used during normal power operation.
A surveillance test of approximately 20 minutes duration at minif1.v conditions is performed during each refueling outage. (The miniflow test is a reduced flow test where water-is drawn from the recirculation sump into the recirculation pump and then discharged.into a 2" miniflow line and then returned to the' recirculation sump).
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There have been no problems or repairs for the recirculation.
pumps since the plant began operation in 1973.
Should you have additional questions, we would be pleased to discuss them with you.
Very truly yours, d
William J.
'ahill, Jr.
Vice President cc:
Mr. Boyce H.
Grier
'ector s
i Off. ice of Inspection and Enforcement U.
S.
Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA. 19406 U.
S.
Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D.
C.
20555 l
5
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Mr.
T.
Rebelowski, Resident Inspector.
L U.
S.
Nuclear Regulatory Commission P.
O.
Box 3B.
u,_
- Buchanan, N.
Y.
10511
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