ML20069B077
| ML20069B077 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/21/1981 |
| From: | Jackson E VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR 81-176, NUDOCS 8112240091 | |
| Download: ML20069B077 (17) | |
Text
4.;_ g VERMONT Y AN KEE NUCLEAR POWER CORPOR ATION -
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FR AMINGH AM M ASSACHUSETTS o1701 O
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United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Thomas A. Ippolito, Chief Operating Reactors Branch-#2 Division of Licensing
References:
a)
License No. DPR-28 (Docket No. 50-271) b)
USNRC Letter to VYNPC, dated July 20, 1981
Dear Sir:
Subject:
Response to Information Request Regarding Station Blackout The attached, completed questionnaires, regarding the reliability of the onsite diesel generators, are being submitted-in response _to the request contained in Reference (b).
We trust the information supplied is responsive to your request; however, should you desire additional information, do not hesitate to call.
Very truly yours, a
VERMONT YANKEE NUCLEAR POWER CORPORATION L
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l Encloture 1 - Pags 2 E2 2 lesel C n rator Scheduled Downtime Record Plant Name_ Vermont Yankee
- Calendar Year 1926 Unit No.
1 Ilours of Downtime Reason for Reactor shutdown Reactor not sleutdown Comments Downtime pgy ugg pgy ugp 3gg DGf DGf I)Cf DCf DCf 1A
.1 M Scheduled Haintenance Replaced Cylinder Pressure Relief Gasket 27.5 Replaced Injector 5.5 Inspected and Re--
placed Blower Gears 12.0 Annual Inspection 76.3 100 Install Ammeter in Control Circuit 3
Checked Injectors 24.5 i
l l
l Time DC is unavailable for emergency service because of required
- tests, a
r e
m Enclesura 1 - Pcg3 2 TAlu.E 2 Dieuel Cenorator Schedisled Downtime Record Plant Name Vermont Yankee Calendar Year 19 Z]
Unit No.
1 Ilours of Downtimo Reason for Reactor shutdown Reactor not shutdown Comments Downtime 1}cy ung DC F 1)U F 7 C F WIF DGF DGF DGF DGF 1A IB Scheduled Hafntenance i
Annual Inspection 75 90 9
Time DC is unavailable for emergency service because of required a
tests
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Enclorura 1 - Pcg2 2 TADIE 2 Diezel Ccnurator Schediiled Downtime Record Plant flame Vermont Yankee Calendar Year 19 28 Unit flo.
1 Ilours of Downtimo Menson for Reactor shutdown Reactor not shutdown Commente Dawntime y
F 7)c n )Cp-11gy-F y
7J DC#
DCF Scheduled Plaintenance i
Annual Inspection 121.5 130 Install Fuel Oil "Y" Strainer 61 Control Circuit 26 Maintenance Replace Lube Oil Circ. Pump 10
.~
Time DC is unovoiloble for emergency service i
because of required
- testa,
.=
Encle::ure 1 - Pcg2 2
~
TAlli.E 2 Disual C uorator Schediiled Downtime Record I'lant Haine Vermont Yankee Calendar Year 1929 Unit No.
1 Ilours of Downtimo Reason for Reactor shutdown Reactor not shutdown Comments Downtime
-ucy uur 7CF UUr TUF tup -
DC#
ITC#
DC#
DCf 1A
.lB 1A.
1 B....
Scheduled Haintenance Annr11 Inspection 46 59.5 i
Electrical. Maintenanc t 8
31.5
. Replace Injectors 2
\\
l Tice DC is unovoilable for emergency service e
because of required
- tents,
I?ncienure 1 - Page 2
~
12 2
!cual C nerator Schedisled Downtime itecord Plant !!aine Vermont Yankee Calendar Year 193 Unit tio, 1
Ilours of Downtime Henson for llenctor shutdown Reactor not shutdown Commento Downtime pgg pag 7Cg 7]gg 77 ygg 3cp]pgf - pgg pgg-1A IB Scheduled Hatntenance Annual Inspection 149.5 117 i
Relay Insp'ection 15.5 Time DC is unavoilable for emergency service because of required tests m
TAlti.E 3 Dienel Cenerator linachedialed I)ownt imo Hecord - Pags 3 Calendar Year 19 26 Plant flame Vermont Yankee Unit flo.
1 i
I.ER Abstract Ni Downtime liours Conunents - It any of Liu reported failures would not have been a (Refer to attel failure unde'r emergency conditions, please explain here.
Total
'frouble-l'a rt a, Dc)- Repair/
ad 1.ER Abstraci s)llours Refer to attached LElts or the failures listed in Table 1.
shooting Ivery.etcteplace i
1 Abstract No. 5
.3 i
Abstract No. 4 3
LER 76-28 6.25 3
6 f
4 4
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9
y TA111.E 3 Dienel Cencrotor Unschedulcil Downtime 1(ucord - l'agn 3 Calendar Year 1917 Plant flamo Vermont Yankee ' -
Unit flo.
1 1.EK Abst ract N.
Downtime llours Couvnents - II any of the reported f ailures would not have been a (Refer to attcl-g ency conditions, please explain here.
p,tib l e l'a r t a, De] Ilepair/
ad LER Abstract s)llours Itefer to attached LElts or the failures listed in Table 1.
shooting tvery.etcteplace Abstract No. 3 2.5 Abstract No. 2 3.5 LER 77-36 1.5 d
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'I Allt.E 3 tileuel Cencrntor linucheduled llowntimo Itacord - Pago 3' Calendar Year 19]
Planit flamu Vermont Yankee ** ~
- IJn i t flo, 1
1.ER Abs t ract N.
Downtime llours
' Comments - It any of tiie reported failures would not have been a (Refer to attc)'
-sid LER Abstracts) Total Trouble-l'a t t a, Del - llepa t r/
failure unde'r emergency conditions, please explain here.
llours shooting tvery etctepince Refer to attached LElts or the failures listed in Tafele 1.
Abstract No. 1 3
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9 4
9 8
4 4
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TAttif. 3 Dieuel Cencrator. Ifnucheiluleil Downtime itecorst Enc}osiira 1 - Paga 3 Calendar Year 19_79 P!nnt flame Vermont Yankee ung t rgo, j
LER Abstract Ni Downtime llours Comments - II any of the reported failures would not have been a (Refer to attel '
f dir um@ mdid% ple glaisi li%
l LE Abstracts) Total
'frouble,Partr Del - Repair /
Refer to attached LElts or the failures listed in Table 1.
llou rs shooting'lveryoutetepince l
NONE 9
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4 9
4 5
4 9
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TA111.E 3 Dienel Cencrator (fouclieduled Downtimo itecord Enclosiira 1 - Pagn 3 Calendor Year la) 80 l'Innc Haena Vermont Yankee **,*
Unit tio.
1
'Connents - If any of the rer.:rted f ailures would not leave been a
- 1. Ell Abstract N Downtime llours (Refer to attcl*
falham inn ameeky condidons, ple aplates lim To M
' Rouble-l'a rta Dc] Repair /
ed LER Abstract s)llours shooting tvery.ctcteplace Refer to attached I.Elts or the failures listed in Talile 1.
NONE 2
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3 Enclecuro 1 - Paga 4 TAllt.t: 4 Onutto 1morgency Dicaal Genurator and I'lant flamu Vermont Yankee 3,
Auxiliary 1:quipo.cnt tiodifical.lon itecord Unit flo.
I Equipment or Date of Itcanon for flodification and procedure
}fod.
Dentred Improvciaceit
'modifled Description of Hodification-
!: l1A Diesel Generator 10/14/80 To change the damper to fail open Relocation of the inlet damper operating
- Room Inlet Damper' on. loss of air or power.
piston to provide fail open feature
- f. 'Dibsel Lttbe Oil 10/20/80 Provide improved lube oil temperature Relocate lube oil temperature indicat. ors.
'i Temperature Indicator indication.
i
- Fan Damper Control 1/16/80 To Drevent governor malfunction due Add a thermostat-tp the diesel roo$rfans,so
(Swi,tch to low room temperatures.
they-shut.o.ff on low room temperature.
Dic'sel Generator 10/6/79 Insure the auto and manual voltage Change the reostat indicating lights to 4
. Voltage Regulator regulator reostats are set to illuminate when within the required setting j/7 provide sufficient ekcitation, to maintain diesel generator voltage within the normal operating range.
,'., Diesel Generator Field 2/7/7f.
Upgrade the field flashing power Change the field flashing power supply to the p., Flashing Power Supply supply to safety grade.
station batteries.
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