ML20010B597
| ML20010B597 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 08/07/1981 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Varga S, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8108170307 | |
| Download: ML20010B597 (5) | |
Text
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Malling Addra Alab:ma Power Company 600 North 18th Street Post Office Box 2o41 Birmingham, Alabama 35291 Teicphone 205 783-6081 F. L. Clayton, Jr.
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Alabama Power August 7, 1981 Um#"" *"
Docket No. 50-348 Docket No. 50-364 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
- r. S. A. Varga Mr. B. J. Youngblood Gentlemen:
EXTENSION OF PREVIOUS GRANTED TEMPORARY CHANGE TO OPERATING LICENSE F0. NPF-2 AND NPF-8 TECHNICAL SPECIFICATIONS in our letter of July 31, 1981, Alabama Power Ccmpany requested a one-time extension to a L.C.0. in the Technical Specifications for Units 1 and 2.
This request sougnt an extension of the 72-hour requirement to nine days in order to return an inoperable diesel (lC) to service. The nine-day period was based on partial disassembly and initial evaluation of the damage to 1C diesel generator. As stated in our letter, the extent of the damage was believed to be confined to:
(1) water entering four cylinders, via the air intake system, due to a failure of the water jacket 0-ring in the number 11 cylinder, (2) scoring of the number 11 cylinder liner and upper piston due to fa' lure of the wrist pin and bushing.
Subsequent, to our July 31, 1981 letter, more extensive damage was found.
Specifically, four additional upper pistons had suffered wrist pin damage; the vertical drive as embly was damaged due to attempting to start the opposed piston engine with water in the combustion chamber; another cylinder liner failed a water jacket hydrostatic test; and the lower crankshaft thrust bearing had failed.
Based on the finci damage evaluation, Alabama Power Company elected to replace all cylindcr liner except number 10; replace all upper piston rings; replace all upper bushings and wrist pins; replace number 11 upper /
lower piston assembly: perform major repairs of the vertical drive assembly; and replace the lower crankshaft thrust bearing. The magnitude of the final repair, which constitutes a near complete overhaul of the engine, is significantly greater than that originally estimated when the extension was requested and granted.
Alabama Power Company, in conjunction with Colt, has developed the O
detaiied run-in test and inspection program (Attachment 1) as part of our
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program nf returning the diesel to service. This program, as a minimum,
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8108170307 810807 PDR ADOCK 05000348 P
g U.S. Nuclear Regulatory Commission Page 2 August 7,1981 will require twenty-seven hours.
In addition, i.he vendor representative may likely extend test run times and/or require additional inspections.
The length of the inspection time has been increased due to increased scope of the repair.
It should be emphasized that the repair effort has been continuing on a 24-hour per day basis with constant onsite support from Colt since diesel 1C was declared inonerable. The completion of repairs will extend past 12:50 A.M. on Augnst 8,1981, the extension deadline. This completion has been significantly Jelayed due to the increased scope of the repair (e.g., problems with obtaining proper clearances on the lower thrust bearing) and problems with obtaining parts due to recent flight interruptions.
Alabama Power Company, therefore, by this letter, requests a further extension of the L.C.0. from a total of nine days to 15 days.
It is the judgment of Alabama Power Company, as outlined in Attachment 2, that the c
reliability of the offsite and onsite AC power sources, under all conditions, is sufficient to allow this extension with no adverse affects to the safe aparation of Farley Units 1 and 2.
Approval of this extension is requested by 5:00 P.M. on August 7,1981, in order that the generation of Un' 1 and Unit 2 not be impacted.
If you have any questions, please advise.
Yours very truly, F.k. Clayton Jr.
4 FLCJr:RLG:aw Attachments cc. Mr. J. P. O'Reilly Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. E. A. Reeves Mr. L. L. Kintner Mr. W. H. Bradford Mr. J. O. Thoma
ATTACHMENT I RUN IN PROCEDURE FAICBANKS MORSE DIESEL GENERATOR SET UNIT IC 38TD8-1/8 OP AFTER AUGUST, 1981 REPAIR MINIMUM **
TEST PERCENT t
TIME LOAD RPM INSPECTIONS / COMMENTS 5 Min.
0 375
- Bearing check upper and lower crankcase
'10 Min.
0 500 Coolant temperature to be not less 0
than 120 F-15 Min.
0 650
- Bearing check upper and lower crankcase 30 Min.
0 800
- Thrust bearing check 30 Min.
0 900
- Thrust bearing check 30 Min.
9 900
- Bearing check upper and lower crankcase and vertical drive gears 1 Hour 23 900-1 Hour 34
'900 1 Hour 45 900 1 Hour 57 900 1 Hour 68 900 1 Hour 80 900
- Bearing check, upper and lower rankcase l
check i
I 1 Hour 90 900 1 Hour 100 900
- Bearing check, upper and lower crankcase 1 Hour 90 900 3 Hour 100 900
- Bearing check, upper and lower crankcase, l
inspect upper piston and rings and vertical drive gears.
l' Engine required to be shutdown Times maybe extended at the discretion of the Vendor f
Representative L
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ATTACHMENT I-(cont'd)
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This' series' of tests is the minimum run:in recommended by the vende i
for an. engine after major repair.
The vendor ' epresentative may requir r
F additional test run times and/or.-supplemental. inspections prior to pre eding
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to the' subsequent-test.
The time. alloted in the test. sequence for en ae i;
shutdown, tag cut, inspection and restoration for startup is one and a ll~'
. quarter hours per ins pction.
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- Atter satisfactory completion of this' series of tests,: Alabama: Power Company will-perform the surveillance test required by Section 4.8.1.1.2.a of Units 1 and 2 technicial. specifications. - The time allote e this test-i is three hours. At~ the completion of this test an. inspection will be performed of the lower thrust bearing. The total minimum time from the
- initiation of the test sequence to declaringithe diesel operable would be about 27 hours3.125e-4 days <br />0.0075 hours <br />4.464286e-5 weeks <br />1.02735e-5 months <br />. After completion of this test sequence,. the engine-will be ran loaded 'for a.specified period of. time which will be prescribed by the vendor. At the completion of~this run the engine will.be run at-110% load for one hour.
For. subsequent surveillance tests required by f-technical specifications during'the next_100 hours.of. engine operation the duration of run time should be extended from one hoiir to four' hours..
NOTES:
1.
New bearing appJications shall be made with F.M. seating -
compound.
2.
A minimum of (4) barrels of used oil designated 'for;the 38TD8-1/8 engine shall be used.
3.
Data'shall be recorded every 30. minute interval on tests
. of one hour-or longer utili:>.ing the revised log sheets (Julyc. '1981 revision).
4.
The hydraulic governing control system shall be utilized' during the run in and load tests shall be controlled against the load stop..This precaution should always be taken to prevent overload when wearing in new -
. engine parts.
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' Attachment-2 Basis of Request For Extension to Previously Granted Temporary Change for FNP Technical. Specifications As shown in Table 1 of the July'31,.1981 request for_an. extension f
.to the L.C.0., diesel 1C is not required for any accident senario except LOSP.on both_ units. The 1C diesel in all other cases only powers the-redundant. river water loads for the A train.
Farley Nuclear Plant has a closed service water cooling system which would negate theineed for.
river water and therefore the need for emergency power from the 1C. dies'e1.
For the accident tenario 'of LOSP:on both' units the 1C diesel would be l
required for Train ALESF buses on one unit.
In each case; however,.the B train ESF buses are unaffected by the failure of diesel 1C and would oe.
available.
In all of the above failure analyses the B train is'totrJ1y capable of powering all loads on both units with no dependence on-A train power sources.
The likelihood of total-LOSP'for both units is extremelyLremote.
There are three-230 KV lines and two-500 KV lines feeding the Farley Nuclear Plant from various locations.in Alabama and Georgia. _'These lines feed 2
9-separate switchyards which are' interconnected _such;that one offsite power line is capable of supplying all emergency AC power for both units. At' no time in the_ history of the Farley Nuclear Plant, has all five operating
. During the-. period of this L.C.O., none of the lines been out of service.
five lines will be taken out of service unless emergency conditions dictate.
In addition, unit startup transformers-A and B serve each Farley _ unit.
No single failure will' remove both transformers.
Each transformer is capable of and is designed to_ supply both trains of emergency. power-assuming the failure of one transformer. The above description substantiates the-ascertion concerning LOSP to both units.
j' The reliability of the operable onsite diesels is considered to be
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high. As discussed in our. July 31, 1981 extension letter,' the rate of..
successful tests of these diesels, since May,1981,:has been significantly increased due to recent efforts made by Alabama Power _ Company.~ Since.the no test failure has been experienced' r
i L.C.0. period began on July 30, 1981, during the staggered surveillance tests being performed on these engines.
It.should be _noted that as soon as diesel 1C is repaired and ~is in the test program, if an emergency situation arose requiring the! operation of the diesel, it would be utilized.
Based on the above discussion, it is the_ judgment.of Alabama Power.
Company, that there will be~no adverse. affects of the safe operation of '
Farley Units 1 and 2 during the _ requested extension period due to the ~high reliability of the offsite and onsite AC emergency power sources.
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