ML18044A808
| ML18044A808 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 05/02/1980 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8005060188 | |
| Download: ML18044A808 (6) | |
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consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201 * (517) 788-0650 May 2, 1980 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Projects Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - FIRE PROTECTION MODIFICATIONS - DESCRIPTION OF REACTOR COOLANT PUMP OIL LEAK COLLECTION SYSTEM 8 0 050 6 0 I lb~
Amendment 42 to License DPR-20 required th.at several modifications be made at Palisades to enhance fire protection capabilities.
Additional design details were to be submitted to NRC for certain modifications as specified in the Safety Evaluation Report (SER) accompanying Amendment 42.
One modification for which additional information was required was SER item 3.1.15, Reactor Coolant Pump Oil Collection System.
This letter provides the required infor-mation on item 3.1.15.
Oil leakage from each primary coolant pump motor is collected by means of a gutter encircling the motor approximately mid-way on the casing and by a plate covering the bottom of the motor.
Oil collected at either location is routed to a collection tank by 1/2 inch stainless steel tubing.
Each collection tank has a capacity of ten gallons, is mounted to poured concrete walls near the pump pedestal (this represents a change from the drawings attached), and is equipped with a level switch which will alarm in the control room when the tank contains two gallons.
A sketch of the collection system is attached along with drawings detailing the collection tank.
The tank installation has been analyzed to show that the tank attachment will accommodate safety shutdown earthquake accelerations without failure; the level switch and drain tubing have not been designed to function during or a~er such an event.
The upper bearing lubricating oil coolers, drain and fill plugs and sight glasses are located directly above the pump motor casing.
Leakage from these components would flow down over the outside of the casing or through the winding and rotor areas to be collected in the gutter or lower collection plate.
The lower bearing and its oil reservoir are located above the lower collection plate; the cooler for lower bearing lubricating oil is located within the reservoir.
The only flanged connections in the oil system are at the upper bearing oil coolers; teflon gaskets are used and no leakage has ever been experienced.
.v Fire Protection Modifications Palisades Plant May 2, 1980 Leakage of oil from either reservoir would be detected by the level switch in the collection tank.
In addition, each reservoir contains a level switch which provides a control room alarm in the event of either high or low oil level.
David P Hoffman Nuclear Licensing Administrator CC JGKeppler, USNRC NRC Resident Inspector-Palisades pages 2
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LE"AK C OL.L.E:"C. ;- 10 N 5YST'~M
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NEMA lJ CONNECTIOIJ BOX WITH Vz" NPT-M MALE CONNECTOR 1/2,, TU8E - V2 "NPT - 2. REQD
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TANK.ASSEMBL. Y cJ*A' c::.,,,z.,,_ 1' n"
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i PIPE 11 #SS (MIN SCH SS)~
ROLL FROM Y8" s~ PL ffi DRAIN* PETCOCK 3/8" NPT-M SS
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'SCALE: 3"= 1 '-0" RE:DUCE.R COUPLING i
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LE~EL SWITCH &
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,WTES:
- 1.
ALL STAll1LESS STEEL ITEMS TO BE TYPE 316, UNLESS OTHERWISE SHOwN.
- 2.
TANK CAPACITY APPROXIMATELY 10 GALLONS
//~~ FLOAT SWITCH TO BE DELAVAL LS-1900 GEMS LEVEL SWITCH WITH 316 SS STEM, BUNA N FLOAT, AND 100 WATI SWITCH CDELAVAL PIN 35682>.
SET UP FLOAT SO CONTACTS ARE N.C. DRY WITH 1/4" NPT MOUNTI~G THREADS FACING UP.
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MOUNTING PLUG TO BE DELAVAL "FABRI-LEVEL COMPO;~ENT" 2" i~PL l 1/2" HIGH, 316 SS MOUNTING PLUG WITH 112" UPT-F or~ TOP AND 3/8" NPT-F ON BOTTOM.
MOUNTING PIPE LENGTH TO BE AS REQUIRED TO LOCATE LEVEL SWITCH.
LOCATED BY ;f I_El.fr, PETCOCK TO.BE SIMILAR TO MCMASTER-CARR 4983Kl5 <CATALOG 85 PAGE 1034)'.
FIX TO PEDESTAL USING STAINLESS STEEL -
toN.cepE-WElj~,~~H~-.~fa;~*x 2.~4".~...._*.
- 9.
VENT DRAIN TUBING TO BE 112" SS TUBING WITH 0.035" WALL, MADE UP WITH SWAGELOK COMPRESSION FITTINGS, OR EQUAL., APPROVED BY NSC.
- 10.
FIELD RUN DRAIN TUBING FROM A DRILLED AND TAPPED HOLE IN
-* "UPPER BEARING *HOUSING UP NEAR THE LUBE OIL SYSTEM COM-PONENTS AND.FROM A DRILLED AND TAPPED HOLE IN CENTER OF LOWER BEARING BRACKET INSPECTION COVER; VIA A TEE, TO THE COLLECTION TANK.
- 11.
DRAIN TUBING TO SLOPE 1:12 MINIMUM, WITH 2" MINIMUM BEND RADIUS.
SUPPORT WITH TUBING CLAMPS AT A MAXIMUM OF 5',
- 12.
AFTER INSTALLATION, CHECK FOR LEAKS BY FILLING TANK FROM
. EACH DRAIN LOCATION WITH POTABLE WATER.
CHECK OPERATION OF FLOAT SWITCH THEN DRAlN TANK.
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) £ DRILL AND TAP TOP OF BLIND FLANGE FnR 2" NPT ~UNTPlr,
~ PLUG. ASSEMBLE FLANGES WITH FOUR SS STUDS AND NllTS..
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