ML20010J011
| ML20010J011 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 08/28/1981 |
| From: | Stonehocker V COLT INDUSTRIES, INC. |
| To: | |
| Shared Package | |
| ML20010J008 | List: |
| References | |
| VTS-985-082881, VTS-985-082881-01R, VTS-985-82881, VTS-985-82881-1R, NUDOCS 8109290498 | |
| Download: ML20010J011 (6) | |
Text
l
- w....m.
~
ATTACHMENT 1 ynE 1
P-***,,I,,
ENGINEERING REPORT ser i or 5 No-5 l
d Fairbanks Morse RILE VTS-985-082881-01R Engine Division DM AUGUST 28,'1981 svarEcr ENGINE PRELUBE/KEEPWARM SYSTEM REQtilREMENTS PREPARED av V.T. STONEH0CKER N LE/RSTkbB tr TS 0
'G ES) g{g GENERAL This report covers modifications to be made to the OP skidded engine units to provide an engine more readily prepared to make fast starts such as are required in Nuclear service.
In the previous engine skid designs, the unit was provided with two systems to precondition the engine lube oil system. The one referred to as the keepwann system, consisted of a motor driven pump and a heater thru which a small flow of lube oil was run while the engine was not in operation.
The oil was pumped fran the L.O.
c~p, thru the heater and back into the opposite end of the sump. The heater was thenaostatically controlled to attempt to maintain the L.O. sump at a moderate temperature. The other system consisted of a somewhat larger capacity pump which was used irrediately prior to operating
~
the engine to fill the engine with lube oil in preparation for an engine start.
This arrangement was used when ever the engine was started for testing or maintenance operations.
In the event of a need for emergency service, startup was made without prelubing the engine.
Research work was undertaken to see if it was possible to derive a system which would allow the engine to be continuously luhricated but not to the point of over-oiling the upper crankline. Work was done at a coanercial power plant having a skidded engine unit similar to those in nuclear applications to develop such a system. This report covers the results of that work and explains the modification to be accomplished on nuclear units in the field.
RESULTS OF THE DEVELOPMENTAL WORK Field testing was done that demonstrated that a system could be made to provide oil flow to the engine while at rest without filling the upper crankline. The test work demonstrated that with a properly sized L.0. circulating pump, with the oil at the proper temperature, an oil level could be maintained somewhat above the lower crankline, but below the level of the upper crankline. With such a system, oil was more readily available to the upper crankline upon fast startup of the engine. The leakage rate of the oil thru the bearings of the lower crankline, oil spitters, and return flow thru the main (engine driven)
L.O. pump could be controlled by the oil temperature (viscosity) to the point of keeping the engine full to a level just above the lower crankline. However, it i
was discovered that if lube oil circulation was reinitiated immediately af ter the engine was shut down, without allowing some oil drainback from the upper i
l 0109290498 810921 l
PDR ADOCK 05000364 P
pop _
L
G.p ~...
Pa!E
.hA..
E ".
ENGINEERING REPORT smr 2 5 2
Fairbanks Morse nLE NUMedTS-985-082881-01R Engine Division DATE AUGUST 28, 1981 sustrer EllGINE PRELUBE/KEEPWARM SYSTEM REQUh7MENTS PREPARzo BY V.T. STONEH0CKER REPORT KEEPWARD L.0. SYSTEM MODIFICATION
,,,,oyg, NUCLEAR STANDBY UNITS (OP ENGINES) sg g crankiine, the upper crankline could still be overfilled when the engine came to rest.
It was demonstrated that if a period of 6 to 10 minutes was allowed before circulation was commenced, that the overfilling of the upper crar.kline could be prevented.
Figure 1 shows the final system arrived at resulting from this development program.
In sunnary, the lube oil circulating system was modified so that oil was delivered to the system at a point near the engine driven pump discharge, thru a check valve. The L.O. circulating heater was increased in capacity from 6 to about 15KW in order to maintain L.0. temperature (viscosity) and to account for tt.e greater losses in the L.0. system because of the increase in the extent of pipin; thru which the oil would then flow, The selected changes to the system and engine are covered in two parts; modification of the systems external to the engine, and internal modifications.
The specific investigation enumerated here, covers the Alabama Power units (F.M. S.O. 205917), but are generally also applicable to other similar units.
(Specific reports / instructions will be written for other contracts.)
MODIFICATION OF THE EXTERNAL SYSTEM Investigation has shown that to adapt this system to the units at Alabama Power would require the following:
Mechanical (Ref: Figure 1) 1.
Change the 6KW L.O. heater to 15Kd.
Infonnation from the most probable vendor indicates that a 15KW heater unit, not exceeding 15 watts per square inch of heater element, can be provided and can be occanodated on the skid in place of the present heater, using the same mounting arrangement. The new unit is about the same size as the present J.W. heater.
L.O. inlet would be ot the same location.
2.
Change the piping fran the discharge of the new heater to a point in the piping at the discharge of the engine driven pump (at the same location to which the prelube pump is now piped), including a check valve (same check valve as.
'd with the prelube piping).
Include a connection for location of i.he thennostatic switch (OHT) at the heater outlet.
1 1/2" piping is required.
3.
Block off the cross to which the old connection was made (drain to front of L.0. scmp).
A
Cellklau.u.f4 2-aA* p)
ENGINEERING EZPORT sm:r: 3 cr 5 no.
3 raos Ca w/
MLE "
Fairbanks Morse
" " "TS-985-082881-OlR Engine Division dan AUGUST 28, 1981 snarzer ENGIftE PRELUBE/KEEPWARM SYSTEM REQUIREMENTS enEPARED BY V.T. STONEH0CKER neroar KEEPWARD L.0. SYSTEM MODIFICATION appaoyzD "E
NUCLEAR STANDBY UNITS (OP ENGINES)
BYgf -(
Electrical (Ref: Figure 2) 1.
Pselocate conduit to heater connection and thennostatic switch connection as required (raised approx.12").
2.
Replace CB3 (20A) with a 50A unit (Same as CB1). (Our drawings do not indicate source on this item. Customer should identify circuit breaker unit manufacture so that it can be duplicated.)
3.
Replace M3 contactor with 11905926 (Cutler Haniner C20DN3A) (Same as M1).
4.
Replace wiring (3 wires each) between CB3 and M3 and between M3 and the heater (OH) with #8 AWG (was #12).
5.
Add a Time Delay Relay - TDX (FM #11904628 - Agastat 7012AH) in the circuit 6
as shown on the electrical schematic - Figure 2.
(One side of the coil to wire G, other side of coil to wire J7.
One side of switch to wire J7 [ removing J7 fran coil of fM]. New wire J7X between other side of switch [N.0. contacts] to coil of M (fran which wire J7 was removed.)
6.
TDX has a range from 3 to 30 minutes and should be set at 10 minutes.
MODIFICATION TO INTERIOR OF ENGINE (Ref: Figure 3)
This modification consists of rerouting the supply to the upper L.0. header such that the header will not readily drain (a loop of tubing up over the crankshaf t above the level of the header). See Figure 3.
Thi.; modification also consists of adding a lube oil booster / accumulator system to the upper crankline, similar to that used on the af t lower main bearing. This booster system fills with oil during normal engine operation.
The next time the engine is started, the lube oil accumulated in the cylinder assembly is forced by starting air pressure acting on thc opposite side of a piston, to be fed into the bearings along the upper crankline, thus filling the bearings with oil as the engine begins to be rotated in l
starting.
No external connections are required with this system as the air supply to the accumulator is tied internally to that of the aft main bearing booster system. The system is self regulating.
Parts for this system are identified on drawings and B/M #16403478 (Release PC3752).
M ML
4 arm o
[a ErnVTS-985-082881-01R narE AUGUST 28, 1981 ENGIrlE PRELUBE/KEEPWARM SYSTEM REQUIREMENTS Pauxam V.T. STONEH0CKER y
aDOa7 KEEPWARD L.0. SYSTEM MODIFICATION y,,oy, NUCLEAR STANDBY UtlITS (OP ENGINES) sy7g 0.P. ENGINE
_IEngine Driven L.0. Pump [L.0. Filter inlet
.I L.0. Sump (j
4
- f..
' i-
~
CHECK l
P re-L ube -
VALVE L.0. Cooler Strainer
,k Pump l
7 -l f ew Connection N
f Original Connection ELECTRICAL SYSTEM L.0. Temp Switcq (Use existing)
REF: 11867337
~~1 1/2" piping (Rerouted)
L.O. HEATER -15KW (was 6KW) 3
/KEEPWARM PUMP - 10GPM (use existing)
, d-- ---- ----
208 volt
_ _ _.e_
bus CR3 CB4 CIRCUIT
{
[ (l [l BREAKER 50A No Change (Was 20A)
,. 7,
- 8 AWG _
"~
~
~
WAS #12
__. 7
. -.s f
- : 1
~
~[7 "
FIGURE 2 CONTACTOR 45 M4 ELECTRICAL SYSTEM MODIFICATION SIZE 2 J7fRR REF: 11867708 WAS SIZE O
- -)
Wqp SHEET 2 GHT TDX SK 1 WAS 6KW OH TDX
Mk i;3
'^ 'N PAGE
./:..
(2 z)
ENGINEERING REPORT surrr 5 er 5 x2.
5 w/
Fairbanks Morse rn.t Engine Division NUMBM S-985-082881-01R DATE AUGUST 28, 1981 sua m ENGINE PRELuoE/KEEPWARM SYSTEli P.EQUIREMENTS Parranzo BY V.T. STONEH0CKER ntP at KEEPWARD L.O. SYSTEM MODIFICATION APPaovro NUCLEAR STANDBY UNITS (OP ENGINES)
BY gpg l
NEW SUPPLY PIPE
$...f JUMPER TO EACH UPPER MAIN BRG UPPER LUBE OIL HEADER B0OSTER SUFPLY "O
,j
.j f1 HEADER i
\\
/
i 8
upper crank / '
=
SUPDLY LINE N PREVIOUS SUPPLY PIPE e
,' /
's
.-_q I
~'
ACCUMULATOR CYLINDER (BOOSTER) 2 gal, capacity 7 __.,
PISTON Y7 f
(at rest)
F j
l I
>=>
To Aft Main Bear;ing Booster Air supply from y
air start header-
/
FIGURE 3 - ENGINE INTERNAL MODIFICATIONS LUBE OIL SUPPLY & B0OSTER SYSTEM x
~-
-p.--_
g 4
g.
y
_m y
n,
ATTACHMENT 2 Colt Industries Fairbanks Morn Engine Division 701 Lawton Avenue Beloit. Wisconsin 53511 608/364-4411 August 28, 1981 Detroit Edison Company 3331 W. Big Beaver Detroit, MI 48084 Attention: Mr. John Green 318 ECT Cubject: Detroit Edison Co. P.O. lE90236 Fairbanks Morse Diesel Gen Sets
Dear Mr. Green:
Enclosed is our engineering report with schematics on the proposed lube oil system modification for the emergency diesel generator sets at Fermi Nuclear II. The report is directed toward Alabama Power Company Farley Nuclear Plant with mention of similarity to the Fermi diesel generator sets.
The only obvinus difference is that Alabama Power voltage is 208 versus the 460 volts at Fermi.
You will note in the report that the mechanical modification is recommended along with the exterior system modifications.
The exterior piping change and lube oil heater sizing change will provide continuous oil flow to the engine lower crankshaft.
This will exceed the initial consideration of providing a supplementary lube oil pump to be activated upon start up. The improvements being; an essentially filled skid lube oil piping system and running oil to all engine lower bearings.
The mechanical modification proposed will go one step further. The engine upper header will be filled with trapped lube oil and supplementary spitters will supply oil to all upper bearings upon a start signal.
Mechanical designs are essentially complete and further testing will be done on the spitter system. The exterior system components are being selected and drawings should be available shortly. We propose to furnish the exterior system components with wiring and piping modifications to be done by the customer.
If you have any additional quest'.ns, please contact the writer.
Yours very truly, COLT INDUSTRIES OPERATING CORP.
0,RJ3ENGINEDIVISON tY y
. W. Tangy Manager, Nu':l ea Parts Dept.
JW7csu a om,,oo e. comm.... op.,
no co,o l
cc: K._Ke'nnamer