ML20039E885
| ML20039E885 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 01/05/1982 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| 82-2, NUDOCS 8201110583 | |
| Download: ML20039E885 (22) | |
Text
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BOSTON EDISON C O M f'ANY GENEmAL Orrects 500 SovLsTON STREET BOSTON, MAaSACMUSETTE D2199 A. V. MO RISI MANAGER NUCLEAR OPERATIONS SUPPORT DEPARTMENT January 5, 1982 BECo. Ltr. #82-2 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555
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License No. DPR-35 Docket No. 50-293 Response to Request for Information on Diesel Generators (U.S.I. A-44) p 4
Reference (A): NRC Letter of July 20, 1981
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from Mr. Thomas A. Ippolito y
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$3 a} JN!
to Mr. A. V. Moris'. (BECo.
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Ltr. #1.81.198)
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Dear Sir:
8 In Reference (A), the NRL requested that we complete the question Nre attach to i t.
Boston Edison believes the attached document satisfies that request]
In preparing this response we used, in addition to Licensee Event Reports, the following sources of information:
(1) System #61 VISI Records -- Maintenance Machine history record files kept on the Diesel Generators and associated equipment - 1972-1980.
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(2) System #61 Maintenance Requests - 1972-1980.
(3) System #61 PDCR's -- Plant Design Changes on Diesels or associated equip-ment - 1972-1980.
(4) Watch Engineer Log Books -- This is the daily log of plant happenings kept by the Watch Engineer - 1972-1980.
(5) 345 kV Disturbances -- This is a list of disturbances associated with the 345 kV Grid. This list is maintained by the Nuclear Engineering Department (Boston Edison).
(Loss of 345 kV requires Diesel's to start.) This is from 1972-1980.
(6) Surveillance 8.9.1 Data Results -- Routine one hour,100% load test performed on the Diesel Generators.
These records are from 1976 - 1980.
Note: This test was performed on a routine weekly basis through 1978. From 1979 to the present, this test is performed every other week.
It is also performed after diesel maintenance has been completed.
8201110583 820105 PDR ADOCK 05000293 P
BD; TON EDCON COM PANY
+
Mr. Thomas A. Ippolito, Chief January 5, 1982 Page 2 (7) Diesel Report Book 1 & 2 -- These are tro books that are kept in the office of the Station Electrical Engineer. They are records of unusual happenings, annual overhaul reports, special reports, etc. The Diesel consultant to Boston Edison maintains these books with the assistance of the Station Electrical Engineer and they are a complete history of the Diesels.
(8) Surveillance 8.M.3.1. A Data -- This is an annual test performed on the Diesel Generators. This test proves the ability of the Diesel Generators to automatically start and accept their ECCS loads with a simulated loss of AC Power and LOCA.
The information provided in the attached Tables 1, 2 and 3 is for the years 1976 through 1980. The information in Table 4 is from the year the reactor went critical, taken to be 1972, through 1980.
We believe this response addresses your request. Should you require further information regarding this issue, please contact us.
Very truly yours, iL.x.(Ak=-
U Vnm Attachments: Table #1 - For calendar years 1976 through 1980 Table #2 - For calendar years 1976 through 1980 Table #3 - For calendar years 1975 through 1980 Note:
1975 necessary because of LER Abstract No.11 Table #4 - From 1972 through 1980
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Encloe ra 1 - Pqe I riant N:i Pilgrm TAnLF. 1 Diesc1 Crneratcr Operation 02ta Unit No.
1 Calendar Yenr 19 3 y
e He.smon f'or DG Humlear Huselie r ;
Percent Duration of Hein'.
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Openation, & echaduled. DG of of Loading of Defore Stop Fa'r Identification of failure Durntion of Fun No.
Starte Fallures _DC (KW)
Eacle IMI Feilure (Refer to attactied I.FRs or Table 3)
Tech. Spec fleq'd Test A
54 1
100s LER not applicable.
Diesel had been _I Tech. Spec. Req'd Test n
55 0
100s tagged out of service.
Prior to l
One Hour at 100%
returning Diesel to service, normal routine surveillance test required to I Automatic Starting,
__A 1
751 be performed; it was while this test Load Sequencing, with B
1 0
75%
was beinq performed the Diesel was simulated loss of slow to start.
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s Encloewre ! - Page 2 Table 2 proe.1 cexrecce Scheduled Downtime Record Fleet Name Pilgrim Calender Y;cr 19],6, Welt No.
1 6
Hours of Downtime Reason for Reactor shutdown Reactor not shutdown Commente Duwntime my my wy Mr Wr Df;F DGF DGf DG#
DGF A
B A
B Scheduled Maintenance Refuel Outage Dates 1/29/76-6/1/76 Refueling Outage 720 120 Preventive maintenance,
Annual checks, Repairs, Modifications cte.
Unscheduled Maintenance Exhaust Bellows Leak 12 Replaced Exhaust Bellows that was leaking at the weld Engine would not Replaced Gov. Dunp valve Coil normally shutdown 8
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Sticky Turbo Assist Cleaned valves Valves 8
Exhaust Bellows Leak 12 Replaced Exhaust Bellows that was i
leaking at the weld l
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l Time DC is unavolloble Diesel Generator Logic dictates that emergency conditions overide normal routine testing therefore, for emergency service time available is N/A.
hacause of required During tests when the emergendy logic is prohibited fztm performing its function, then the Diesel /
Generator is considered to be unavailable and the hourt are keflected above in the downtime.
teste
7 F.nclosure I - Page 2 '
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Diesel Cenarctcr Scheduled nevntime neeerd Plant C*eme Pilgria TAsut 2 1
canand:r vece 1977 sett me, e
1 Hours of Downrsee Reason for Reactor sleutdown Reactor not shutdown Ceemente DuwntIme my wy my wt NF TNif DGF DGF DGF DGF A
B A
B Scheduled Hatatenance Refueling Outage Refuel Outage Dates Preventive maintenance 454 800 0/6/77-12/12/77 Annual check 3, Repairs Modification, etc.
Installed expansion 30 To allow testing of the coolant systems water tank Relocated Ventilation 84 24
'Ib allow pre-work on modifications Cable & Dampers scheduled to be done during outage Inspection of Radiator Fan Blades 30 30 Engineering Dept. had requested hubs of blades be inspected Unscheduled Maintenarce i
Leaking Fuel Gauge S
Leak had been observed during routine Line test and line was replaced l
Time DC is unavalloble fer emergency service because of required N/A N/A See 1976 Table 2 taeta Coutnent
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, - Page 2 TAnf.s 2 Diseat cenercece Scheduled Downtime neeerd Fleet Name Pilgrim Calendar Taar 1978 unit No.._
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Moers of Downtime Feeson ace Reactor shutdown OOW88 EI"8 Reactor not minutdown Commente WF WF WF WF Nf DGF DGF DGf DC#
DCF A
B A
B Scheduled Maintenance No Refueling Outage Radiator Fan Blade 72 Inspection Unscheduled Maintenance Belt-Fuel Oil Pp 6
Belt-Fuel Oil Pp 6
Belt-Fuel Oil Pp Shaft Driven Fuel Oil Pp "V" Belts 6
were failing (Breaking). Changed belt and type fastener.
Engine sluggish 48 Replaced Govenor Engine would not shutdown normally 4
Replaced Gov. Dump Valve Coil Failed Gen. Exciter 46 Replaced failed electrical components Gen. had been closed in out of sync.
Fuel oil leak n
6 Replaced leaking fuel oil crossover "T"
connection Generator failure 384 Rewound Generator and replaced Govenor Engine sluggish 4
Replaced Gov oil Tisie DG is unavolloble N/T for emergency service N/A See 1976 Table 2 liecessee of required conenent teste
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hBM 2 Diesel Cener ter Sched61ed Enclosure I - Page 2 -
Downties Reeerd calendar Year 19],9,,
Plant Name Pilgrim 9
Unit No.
I e
Hours of Downtime Itesson for Reactor shutdown DowntJoe
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Reactor not shutdown Cessmente my my wy I wy smy gmy pcy agg pcp ogy A
B Scheduled A
R I
Maintemance g
g gg Engine Sluggish 4
Replaced Gov. Oil Engine Sluogish
_10 Replaced Gov.
Locse Bolts 4
Indicating Cock Bolts Tightened Pre-Lube Trip 4
Faulty connection in Motor Terminal Loose Belt Box.
4 UNSCHEDULED Fuel Oil Pp V Belt slipping MAINTENANCE Engine could not be normally shutdown 12 Govenor Dump Valve Nut had worked loost Engine could not be repair was to roughenthe threads normally shutdown 6
Govenor Dump Valve Nut had again worked loose. Repair this time was to drill hole and use stainless steel wire to secure.
Received Generator Protective Relay 24 Operation Electrical checks were performed and no reason for the relay operation could be determined Tline DC is unavalloble for emergency service because of required N/A N/A See 1976 Table 2-tests comment
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r Tans.4 2 Dise:1 Cenercent Scheduled - Page 2 Downtime Reeerd Calendar Year 1980 Finne Name Pilgrim s
page pe, _
1 e
' Howrs of n~.mcJ Reason for Reactor shutdown DowntJoe Reactor not shutdonan Commente wr my wr we my una sc#
DGF DGF DGF A
B Scheduled A
B Maintenance REFUELING OUTAGE REFUELING OUTAGE DATES 1/5/80-5/19/80 Preventive maintenance 240 1082 Annual checks, Repair::,
Modifications, etc.
Generacor Electric 8
Heater Repaired Heater UNSCHEDULED
. MAINTENANCE Fuel 011 leak 6
Replaced leakina Fuel Oil crossover "T" connection Tlme DC is unavalloble far eniergency service N/A N/A bzcause of resguired see 1976 Table 2 i
tests coment i
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Table 3 Dies:1 censrcter unatheduled ti
...e sie,,,a Enclosure I - Page 3 Calender Year 1975 Pl##t Name _ Pilgrim Unt't No.
3_
I.ER Aliatract N.
(Refer to at tel
_ f*:n. time lloura Tord
'fr d W
_ ' Comments - H any of tiin reported fail i
uren would not have been a failure tende~r emergency conditlana, please explain he
[ MR Astracts)Mours Parta M' Repatr/
shootin Refer to attached Lens or the failures llated i a_fwe n t' 5 place e.
11 6
30%
N/A 70%
During routint noticed to be slower than normal. surveillance testing, the engine comin assist valves which were sticking. The troubic was traced to the turbo engine starting time tested.
'Ihe. valves were cleaned and the Notes This LER is,for 1975 but was part of enclosure #2 st$pplied with the Information Request.
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u, TAsix 3 Dies:1 canarctcr unschedr.ted thnn..sme Record F.nclosure I - Page 3 Calender Year 19_76 rs==t name -pilarim gngg n, _
g IIA Abstract N.
D entime Hours Commente - TI nny of the reported failures would not h
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e (Refer to attel ed I.ER Abstra
.rotal "frouble-l'arta Del k failure unde'r emergency conditione, please explain here ave been a ces) Moore Repatr/
Refer to attached IERe er the failures listed in sheetingitvery. ate gplace 9
12 20%
20%
60%
During routine surveillance testing of Diesel "B", smoke was observed to be coming out of the exhaust manifold area.
A weld on a dellows Connector which is part of the exhaust manifold had failed.
ne Bellows Connector was replaced.
Note:
The failure,of this weld on the Bellows Connector wo'uld not have prevented the diesel from performing its desioned function.
10 12 20s 203 60%
During routine surveillance testing of Diesel "A", an exhaust manifold leak was reported.
the exhaust manifold had a iled.A weld on a Bellows Connector which is pa The Bellows Connector was replaced.
Noter
'Ihe failure of this weld on the Bellnws Connector would not prevented the diesel from perforwing its function.
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TA.51.E 3 Dies:1 cenerce:r linenhedsted newsiume siecord F.nclosura 1 - Page 3 Calender Year 19E Plant Name Pitorim theft No.
.i 1
1.ER Ahstract N e
Wa. time Hours (Refer to attet commente - It any or the reported fa11 eres would not have been a falleere usede'r emergency conditions, please amplaim here.
M u t Abstrees d otal Trouble i'a rt a, pel'- Repatr/
T Refer to attached LERe er the fatteres listed in Table ilotste sliectina_ t_very.3e toplace 6
N/A N/A N/A N/A
'Ihis LER was part o' enclosure #2 supplied with the information request letter.
It does not have anything to do with thr. reliability of the i
Diesels and should be disregarded for this study S
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TABLE 3 Eles21 cem rcter uneeheduled Downesmo secord - Page 3 Calender Year 19 8 7
Plant Home _pilaria gagg me, j
IER Abstract Me Downtime lleura e
U*I*f "* *EE*I
- I * ' * #*E**
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Total Trouble-Parta. Del !
failure unde.
ed LER Abstreets)ttoute Refer to attached LERe or the fe.twres listed Repatr/
shootina'twery.etcteplace i__
E 7
400 los 30s 60%
During routine surveillance testing of Diesel "B", the Generator output breaker tripped.
Generator had Shorted to ground.Investiaation showed that stator of the
'the stator was rewound.
8 48 40%
los 50%
During routine surveillance testing of Diesel "B", the Generator was inadvertently thrown in out of synchronization.
showed that various electrical components within the eXClter &
Investication regulator had failed.
full load test was performed for 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. Failed conponents were replac 9
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e TABLE 3 paesel cenarcrar thischeduled Downte==e socord Encloewre ! - Page 3 Calen ter 1.'wer 193 Plant Name Pilgrim Ifnit No.
1 r.ER Alestract No Downtime llawra (Refer to attel to - It any of th,e reported fa(Iures would not k a
ed LER Abstraerspern Yarts. Del - Mepatr/
Refer to stracteed LERs or the fatture om te ewe been s 88eere sleest ina_ l_veryjett ta g a 1c e,
5 a e 1.
24 1004 A routine starting surveillance had been performed on "A" Diesel and after the surveillance was performed annunciation was observed showing that the generator output breaker was tripped surveillance test only required that The start and was not required to be loaded.the diesel be observed to When all tests proved positive, the diesel was s x st.
run for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at loaded and 100% full load before being returned to service.
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I-TABLE 3 Caesal censre:er unerheduled poweitsee neeerd Enclosure I - Paga 3 t'.alenderTear,193 Plant Name Pilgrim e
Unit No. __
1 Ms tr.E Ata t s ac t He
'Ctefer to ated bountisee Itoura '
Commente - It any oE the reported failures would not have been a d
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g,g3y,,
f # " " "I ctal freeble-h.orce. net i Repatr/
,,4,c esmergency condit fees. please emplain here.
ete teplace.
Refer to attached LEpe er the failurne listed de Table 1 Heeire_ 's h ot.!eg tveryj t
,1 N/A N/A N/A et/A This LER was part of enclosure #2 supplied with the information request letter.
s As stated in' the LN, the reason for the' language in the Tech. <:pecs.
LER was because of ambiguous s
This LER is not related to the reliability of the Diesele and should be disregarded for'this study.
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2 6
N/A 50%
50%
While performing a routine surveillance test on Diesei "A" a fuel oil leak was observed.
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The failed component was a crossover "T" connection in the fuel line and was replaced.
3 102 25%
25%
50%
A special test on "A" Diesel was being performed as requested by the NRC.
'Ihis test included operating the unit for 24 continuous hours at 100% full load and for one hour during the test, the unit is to be Ioaded to 110%.
tenance overhaul.This test was being performed after the annual main-Three hours after the initial start the unit tripped, because the fuel oil transfer pump breaker which had been tagged out for the annual overhaul had not been restored to service.
After restoration of the fuel oil transfer pump, the test was restarted About 1) bours into the test the shaft driven oil pump V belt broke and transferred over to its backup.
It was decided to stop the test, replace the belt and restart the test the next day.
The next day the test was started and after 21 hours2.430556e-4 days <br />0.00583 hours <br />3.472222e-5 weeks <br />7.9905e-6 months <br /> the unit tripped because of a transformer failure.
The transformer and other electrical components which had failed were replaced and after the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> I
declared operable.
test was per'ormed, the. unit was 4
N/A N/A N/A N/A
'this LER was part of encicsure #2 supplied with the information request letter.
It does not have anything to do with the reliability of the Diesels and should be disregarded for this study.
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' lAtt.E 4 Onnite Emergoney Diesel Cenerator and - Page 4 p
g4 Aux 111may Equipment Modification Record Plant Name Pil' aria Unit No.
Reason for Hodification and 1
Equipment or Date of procedure Hod.
_ modified Desired improvement Description of Modification A&B Diesel Exhaust 1977 Cracks were being experienced on the 1:
Manifold Pipes
& Bellows welds of the Exhaust Manifold Pipes Changed the welding specifications so.that all and the Bellows exhaust manifold welds would use filler metal (Inconel 625) 1 2:
Changed Bellows to Inconel type 3.
Changed exhaust manifold support assembly to minimize vibration 4.
Replaced all exhaust manifold pipes & Bellows to new style A & B Diesel April Hub of Radiator Fan Blades subjected Radiator Fan Blades 1977 to hiah torsional stresses and the Procedure written that requires that hub of bla" Engineering Dept. requested that be examined on a routine basis. (Dye Penetration.
they be checked.
Proc. 3.M.4-36 A & B Generator 1977 While performino a routine test a Exciter, Regulator Aug.
failure of Diodes in the regulator b
Replaced (2) fuses on primary transformer with 1 at Replaced (3) saturable core transformers and Circuit Breaker thru circuit cascaded into failures of c
Replaced (2)
Logic Dec.
Other electrical components in the fuses in regulator with solid links:
di exc1ter and the requiator, Removed diodes that were unnecessary Installed a time delay relay to remove race of e
relay contacts Investigation of this failure resulted in desired changes to improve the reliability during voltage transients and the elimina-tion of a race of relay contacts in the generator breaker logic.
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Enclosura 1 - Pcta 4 '
TAug.R 4 On lta F.mergincy Diccal Generator and FIC;t Name Pilgr{m
- Page 2 of 4 Aufliary Equipment Hodilsettime Rescrd Welt lie.
1 Equipment er Data of Reason for Hodification and procedure Hod.
Desired improvement Description of Hodification modsfled A & B Cenerator 1977
'Ib provide antimotoring protection Installed Reverse Power Relays to protect against Relay Protection Aug.
during tests when the Generator ic antimotoring during test.
l thru tied to the system.
l Dec.
A E B Diesel 1977 Moisture entrapment was causing Modified the Exhaust Pipe top rain shield and repaired Exhaust Ducts-Aug.
corrosion on the ducts.
the Missle Shield.
thru Dec.
A s B Diesel Air 1977 The Diesel Engine Room Air discharge Changed the discharge plenums so as to eliminate the Discharge Plenum Aug.
route was restrictive.
This resulted air restrictions and increase the cooling radiators thru in the cooling radiatt,rs being in-efficiency.
Dec.
efficient.
A& B Diesel 1977 Air supplied to the Diesel Combustion Installed the necessary piping to relocate the engine Combustion Air Intde Aug.
Air Intake Filter was required to Combustion Air Intake Filter so that the engine Filter thru pass over the hot running diesel.
receivedintake air at ambient temp.
Dec.
This would result in the air absorb-l ing heat and supplying hot air, which
(
resulted in the engines running hotter than was necessary.
A s B Diesel 1978 Shaft Driven (V Belts) were failing Changed to a new style belt and a different type Fuel Oil Pp.
at the connection where they were connection.
(V Belt) spliced.
e
,y
,m
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Ecclosura 1 - Pcge A.
TABLE 4 Onsite Emerstney utocal Generator and Flant Name Pilgri=
Auxslicry Equipenext Madillection Re ctd Unit Hos i
3
" Equipment er
'Date of Remmon l'or Hodification and
,,i l
procedura HoJ.
Deetred Improvement c.. ' ' Description of Modificatten modified A & B Diesel Govenor 1978 Normally energized coils when engine Replaced 125v rating coil with 140V rating coil.
l solenoid coil not running were failing. This re-sulted in inability to shutdown engines electrically after they were started. The coils were 125V rating and being maintained at 134V.
A s B Diesel Jan.
Surveillanco test as required by Tech. Per administrative directive, Testing Surveillance Generator Monthly 1979 Specs is to be run once a month.
performed every other week as opposed to orece a week.
Sury.
Per administrative decision, this'was Note: Consideration is being given to going back to being performed onco a week.
It was once per week testing and also to run the unit felt the test should be cut down to for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> atapproximately 75% and once a every other week and this would be month at 100% for one hour to meet the-better for the diesels and their
'nech. Spec. requirement, associated equipment.
A & B Diesel 1980 The location (height) of the expan-Raised the expansion tank to a level that would prevent Cooling Water sion tank was at a level (low) that air from being entrapped in the cooling water.
Jacket Expansion on fast starts of the engine air Tanks could be entrapped into the cooling water of the diesel.
O I
I
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TABLE 4 onatto r_mergency etccal Gdn2rator and Enclosura 1 - Pcge 4-rimer name rilarim Auxtilgry Equ!pement Hodiffect. fan Record l
Page 4 of 4 Ifnit 10s.
1 Fquipment er
'Date of Reason for Hoellftcatios' ~and e
procedure HoJ.
Destred Taprovement.
moellfled Deecription of Modifteetten A & B Cnce Per Cycle 1978 Changes in 'Ibchnical Specifications Automatic Load 1979 required that the procedure be Changed / updated procedure as required.
Sequencing of the 1981 changed for doctanentation of testing, Diesels more testing, etc.
Proc. 8.M.3.1 l i
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A's B Diesel 1979 Fire in the Cable Spreading Room.
Isolation switch installed in Diesel Room to isolate Generator control 1980 The control cables that run between the Cable Spreading Room Cables and allow operator Logic the Diesel Room and the Main Control control from the Diesel Room.
Room that pass thru the cable Spreading Room were required to be isolated if a fire were to occur in the Cable Gpreading Room.
A & B Diesel Air 1980 The gasoline engines which are a back-Installed 12V electric starting motors and batteries.
Start and Turb Assist up for the motors on the compressors Air Compressors were hard to start.
A & B Diesel Fire 1978 To comply with NRC Branch Position Installed:
Protection 9-5.1.
Pre-Acting Automatic Sprinkler System Smoke Detection System Heat Tracing on Sprinkler Pipinq e
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