ML20031D841
| ML20031D841 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/08/1981 |
| From: | Sargent C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20031D842 | List: |
| References | |
| NUDOCS 8110140290 | |
| Download: ML20031D841 (3) | |
Text
B O Commonwealth Edison
( i ) one First National Plaza. Ctgapo. Illinofs
/
v Address Reply to: Post Office Box 767 Chicago, luinois 60690 October 8, 1981 D ll&
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Mr. A. Schwencer, Chief Licensing Branch #2 k]
OCT1319816.
Division of Licensing U.S. Nuclear Regulatory Commission v.s. mw nouwon s
Washington D.C.
20555
%)
41
/
[-
Subject:
Proposed Changes to the LaSalle Technical Specification
Dear Mr. Schwencer:
The purpose of this letter is to provide information requested by Mr.
A. Bournia in a conference call on October 8,
- 1981,
~
with Mr.
J. Knox, Mr. R Giardina, and Commonwealth Edison represen-tatives.
Figures 1 and 2 illustrate a schematic diagram of the proposed modification to the LaSalle diesel generator lubrication system.
Completion of this modification should address the concerns in SER Section 9.6.3.4.
The proposed Technical Specification Change to allow operation with the 125v D.C. battery cross-tied to Unit 2 until Unit 2 is placed in service is shown in Figure 3.
We understand Mr. A. Bournia will notify this office as to the acceptability of these proposals.
If there are any questions with this regard they should be addressed to this office.
Very truly yours, e eLy C. E. Sargent 3 00/
Nuclear Licensing Administrator S
cc:
Mr. A. Bournia
//
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ELECTRO MOTIVE O
M AINTENANCE ge,>.... pg s. ; Q54n INSTRUCTION W5:Q?@:,
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MODERNRATION, RECOMM END ATION
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O IMMERSION HEATER - LUBE OIL CIRCULATING PUMP SYSTEM FOR EMERGENCY FAST START INSTALLATIONS To provide an improsed immersion heater tube oil circulating system, Figs. I and 10.
PUR POSE:
that will consistently supply oil to the turbocharger and crankshaft in anticipation of an emergency start.
All turbocharged "S" "999". and MP45 emergency fast start installations.
APPLICATION:
Wear is minimi7ed if lube oil is supplied to engine and tyrbocharger bearings prior to DISCUSSION:
and during high speed emergency starts.
EM D's original immersion heater system provided a parallel lube oil circuit whereby oil is supplied to the turbocharger bearings via one path and the oil cooler and filters are flooded via another path. However, following a load run, the branched oil flow is unbalanced because of the thinner viscosity of hot oil. As a result,the oilles clin the cooler and filter is not replenished to the fulllevel until tne oil cools sufficiently (approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> following shutdown). High speed starts during this period not have the wear minimizing benefits of continually abundant oil supply.
O Owners of EMD nuclear standby units have previously been notified of the unnecessary wear caused by equipment exercise or test schedules that routinel.s cal restarting engines without first allowing for a cooling interval from a previous load run. Alibough a few random starts under these adverse conditions are not expected to cause difficulty, the cumulative wear from repeated routine starts is likely to affect cquipment reliability. lim D recommended that exercise and test schedules b M
to avoid restarting engines until they have had a three hour cooling period following r
shutdowns.
eu..,
1 The primary benefit to be gained from this modification is continual oil repicnishme of the oil cooler and filters to the full level regardless of oil temperature and siscosity.3 it would also remove restart restrictions imposed on exercise or test schedules.
pV i
July 1980 DE.P u
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- M.I.9M4 llowever, othen benelits provided by this impiovement make this modilicatiim attractise even w hen exercise or test schedules can be carefully controlled. Oil spiems, modificd in accordance wit h t his instruction provide consistent oil eirculation s hi ongh a
the engine crankshalt hearings in addition to the turbocharger. As a result. engines very rapidly appioach operating oil piessures following start up. Trapped air which may impede oil flow is vented from the system.
Proper performance of this improved system depends on operation of AC mo:or drisen oil pumps. If start-ups are delayed for more than 5 seconds after loss of AC power, we recommend that DC backup pumps be provided with suitable protection against reverse flow through the use of check valves.
Although oil flows through the crankshaft bearings, the standby oilleselin the engine is kept below the camshafts and valve rocker arm assemblies. Sight glass indic.iors.
l'ig. 2. are used so that the operator can visually ascertain if the system is operating
~
piopeily undes standby conditions.
- Indicates Sight Glats Siphon Break (Vertical Height Critice!)
(Connect To Side 1/2" OD Steel Tube a 5/8" OD Steel Tube On 20 645E4 Outlet Of Tee On
/h 3/8" OD Steel Tube On 16 645E4 F
Ve t L n
[E 1/2" OD Steel Tube On 12 645E4 e
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Vent Camshaft C' Weight.
),
g,
Housing s
- h "f^
N 4"IPS
> 1/8" Orifice To Turbo Soak Engine
. ()
Q 2
Back Oil Pump Alarm Switch b
1/2" OD o
' And Gauge.
o Gauge 0 - 100 psi Steet
.060" Tube Orifice Switch Pickup be At 10 psi
._ a Dropout At 6 psi p; g at
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Turbo Soak F4 8
~Back Oil
' Prime te sure u np.
Filter Outlet Elbow Plug
\\1/2"lPS Swing Check Valve i
Lube ump "In
From----
> To Turbo :. ",
Oil "9
Strainer Scav. Oil 1" OD Steel Tube
,o
\\
Box Pump Engine 1-1/4" lPS j/
1"IPS 1 ~ IF's
/2" 1"IPS 3 GPM Pump--CO 6 GPM Pump 5-E 1
-V 30 psi 75 psi -- Yr -
1"IPS S, trainer Relief Relief.... Strainerg
-m-Pump "Out" Plug o: d w.
Check Check:
To Circulating Oil Pump..ag 0,: r,,
Alarm Pressure Switch -
Pickup At 20 psi ~._
Dropout At 15 psi A
Fig.1 - System Schematic Diagram, "S" Units 2-e
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