ML20030B108

Forwards Request for Info Re Unresolved Safety Issue A-44, Station Blackout. Response Should Be Submitted within 120 Days.Analysis of Data Will Be Completed by Feb 1982

ML20030B108
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	07/20/1981
From:	Ippolito T Office of Nuclear Reactor Regulation
To:	Rich Smith VERMONT YANKEE NUCLEAR POWER CORP.
References
REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR NUDOCS 8108050452
Download: ML20030B108 (16)

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Docket lio. 50-271

. July 20,1981 Mr. Robert B. Smith, Licensing Engineer hb

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Vermont Yankee Nuclear Power Corporation

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1671 Worcester Road Framingham, Massachusetts 01701 bQ& f

Dear'Mr. Smith:

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Subject:

Infomation Request Regarding Station Blackout, Unresolved Safety Issue A-44, Vemont Yankee Nuclear Power Station The !!RC staff is currently addressing Unresolved Safety Issue (USI)

A-44, Station Blackout. The purpose of this work is to establish the safety significance of an event resulting in a loss of all alternating current power and, if significant, to consider the need for any specific changes. Over the past several years infomation requests have been forwarded 'which requested infomation that is being used in the USI' analysis. Your interest ~and cooperation in the past have been appreciated.

At this time the USI A-44 effc.rt is being directed toward detemining the reliability of the onsite standby diesel generators. The enclosed questionnaire has been prepand to provide accurate operating experience to serve as a basis for such t detemination. More specifically, its purpose is t.o obtain more detailed data than were available in previous diesel generator studies such as AEC-0'E-ES-002, NUREG/CR-0660, and MUREG/CR-1362.

The questionnaire (enclosure 1) requests infomation in tabular form and solicits data for the years 1976 through 1980, inclusive. There are four tables enclosed:

(1) Diesel Generator Operatiens _ Data, (2) Diesel Generator Scheduled Down Tine Record, (3) Diesel Generator Unscheduled Down. Time Record, and (4) Ondte Emergency Diesel Generator and Auxiliary Equipment Modification Record. Also enclose <1 are axamples of completed tables as well as a clarification of what should be entered.

Please i

note that, although it may appear that only Licensee Event Report (LER) infomation is sought, dat on all diesel generator malfunctions, independent

- of wilether an LER was prepared, is requested.

Please find enclost.d LER documeritation (enclosure 2) presently docketed for your facility. You a.re requested to review these and to indicate if i

there are other reports which have rot been enclosed. Finally, please find enclosed a copy of the appropriate portions of your response (enclosure C108050452 810720 PDR ADOCK 05000271 l

F PDR OFFICE) a a."".

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SURNAME)

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NRC FORM 318 (10-80) NRCM C24o OFFIClAL RECORD COPY usamim-mmo

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Mr. Pobert B. Smitha 3) to our letter of March 6,1978 which requested related, but different, information. This is being forwarded for your information only and should aid in preparing Tables 1 through 4.

In consideration of the time and effort necessary to obtain this infomation, the completion of Table 4 should be considered voluntary. However, it should be noted that if operational and hardware modifications are not identified, the positive or negative influence of these features on emergency alternating current power reliability may be lost in the evaluation of the data. The expected effect is that our generic reliability estimates may be lower than that which actually exists.

The above infomation is requested in accordance with Sections 103.b.(3) and 161.c of the Atomic Energy Act of 1954, as amended. To meet our schedule requirements for the resolution of USI A-44 and to incorporate as much real experience as possible into the reliability model for emergency power systems, it is requested that your response be provided within 120 days of the receipt of this letter. However, if this schedule is inconsistent with priority requirements for other licensing work, please provide us with your proposed date of response within 30 days.

We plan to complete our analysis of this data by February 1982. Your data should be provided by that time so that an accurate assessment of onsite alternating current power sources can be made.

Mr. P. Baranowsky has been designated Task Manager for USI A-44.

Should you have any questions, please feel free to contact him at (301) 443-5921. Your time and efforts are appreciated.

DISTRIBUTION Sincerely, Docket File 50-271 T. Novak NRC & Local-PDRs T. Ippolito TERA ~

V. Rooney GIB Reading S. Norris ORB #2 Reading T. Murley Thomas A. Ippolito, Chief D. Eisenhut F. Schroeder Operating Reactors Branch 92 R. Purple J. Heltemes Division of f.icensing J. Roe ACRS (16)

Enclosures:

I&E (3)

As Stated K. Kniel P. Norian ec: w/ enclosures P. Baranowsky See next page J. Butts This request for information was approved by the Office of Management ar.d Budget under clearance number 3150-0067 which expires May 31, 1983.

Coments on burden and duplication may be directed to the Office of Management an) Budget, Washington, C. C.

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'Mr. W. F. Conway.

John R. Stanton, Director President. & Chief Operating Officer Radiation Control Agency Vermont Yankee Nuclear Power Corp.

Hazen Drive 411 Western Avenue Concord, New Hampshire 03301 Drawer 2 West Brattleboro, Vermont 05301 John W. Stevens Conservation Society of Southern Vermont Mr. Louis-H. Heider, V.P.

P. O. Box 255 Vemont Yankee Nuclear Power Townshend, Vermont _05353 Corocration Ray:end N. FcCandles's 25 Research Drive

. Radiation Control Pro ram Occupational & Radiolhgical Hith Westboro, Massachusetts 01581 John A. Ritscher, Escu1re Administration Building Montpelier, Vernent 05502 Ru.;es & Gray 225 Franklin Street New England Coalition on Nuclear Boston, Ma.ssachusetts 02110 Pollution Hill and Dale Fam Laurie Burt West HFrF - Faraway Road

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Assistant Attorney General Putney, Vermont 05345 ~

Environmental Protection Division Attorney General's Office.

Dublic Service Board One Ashburton Place,19th Floor _

State of Vemont Boston, Massachusetts 02108 120 State Street Montpelier, Yement 05502 Ronald J. Wilson 81018th' Street, N. W.

W. D. Murohy, Plant Superintendent Suite 802 Vemont Yanke' Nuclear Power Washington, D. C.

20005 Corporation P. O. Box 157 Honorable M. Jerome Diamond Vernon, Verm nt 05354 Attorney General State of Vemont David White 109 State Street Co.-Director Pavilien Office Building Vemont'Public Interest Montpelier, Vemont 05502

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Reserach Group, Inc.

43 State Street Vermont Yaakee Decomissioning Montpelier, Yemont 05602 Alliance 127 Main Street Yemont Yankee Decommissioning Brattleboro, Vermont 05301 Alliance 5 State Street Mr. E. W. Jackson Box 1117 Manager of Operations Montpelier, Vermont 05502 Vermont Yankee Nuclear Power Corp.

411 Western Avenue Brooks 1%morial Library Drawer 2 224 Main Street West Brattleboro, Vermont 05301 Brattlebero, Yemont 05301 w

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Mr. Robert L. Smith cc:

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Enclosure 1'- Pags 2

• E 2 local Crnaratar Schsduled Downtime Record

'Plcnt Name Calendar Year 19_

Unit No.

Hours of Downtime Reason for Reactor shutdown Reactor not shutdown.

Comments Downtime ucy pur ucy our Dcy DGy DGF DGF DCf DCf Scheduled Haintenance l

4 Time DG is unovoilable for emergency service r

because of required tests

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Enclo;ura 1 - Pag 2 3 TABl.E 3 Diezal Cencrator Unscheduled Downtimo Record Pirnt Nine Calendar Ysar 19_

Unit No.

?

LER Abstract Na Downtime Hours Comments - If any of the reported failures would not have been a (Refer to attel failure unde'r emergency conditions, please explain here, 4

ed LER Abstracts) Total Trcuble-Parts, Del - Repair /

Refer to attached LERs or the failures-li ted in Table 1.

Hours shooting ivery.etc teplace I

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Enclo:ure 1 - Paga 4 Taut.E 4 Onsite Emergency Dissal Cenerator and Plant Ntme Auxiliary Equipment Hodification Rscord Unit No..

Equipment or Date of Reason for Hodification and modifled Desired Improvement Description of Hodification procedure Hod.

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Encloruro 1 - Pcge 5 TABLE ENTRIES

' EXPLANATION / CLARIFICATION Table 1 Reason for DG Operation and Scheduled _ Duration of Run: This column contains the different categories of diesel generator operation. The categories are structured such that the start and run conditions are similar for all of the tests in-a category. In this column, enter the scheduled run duration for each of the test categories. Also enter the number of diesel generator starts that are done for each type of test. For example, if on the monthly test there is one start from the local con-trols and one start from the remote controls, the number of starts per: test is two.

If two or more diesels are started simultaneously for any reason, please record it as a multiple start.

DG No.: Enter each diesel generator's identification number in this column as shown in the example.

Number of Starts: Enter'the sum of the successful and unsuccessful start attempts for each category. If there are several starts for each test, include all of '.nec, but be certain to record the number of starts per 4

test in column one.

Number of Failures: Enter the sum of the failures for each category. A failure is counted if the objectives of the test are not achieved. A subsystem failure that does not cause failure of the diesel generator system is not counted as a failure. If the diesel generator did not start, run, and load as required by the test, a failure should be recorded. However, if the diesel generator would have supplied power j

in some capscity for an emergency, please explain in Table 3.

For example, if the diesel started on the second attempt or the diesel was tripped to repair a minor oil leak that would not have been a problem in an emergency, this should be noted in Table 3.

Percent Loading of DG CKW): Enter the percentage that the diesci is loaded for each category. The continuous kilowatt rating is considered to be 100%.

Duration of Run Before Stop for each DG Failure: Record the run-time for each failure. If the diesel failed to start, the run-time would be 0 min.

Identification of Failures: Attached to this questionnaire are abstracts of the LERs related to the diesel generators. The abstracts are numbered starting with ene.

Refer tc this number to identify the failures, but if there was ? failure for which there is no abstract, assign the failure a number and include it in Table 3.

Table 2 Reason for Downtime: Enter in this column the categories of schedule main-tenance that make the diesel generator unavailable for emergency service.

If the diesel generator is unavailable'for emergency service during surveillance testing, report t'at also.

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j Enclorura 1 - Pagt 6.

2 Table 2 (cont'd)

Hours of Downtime: -Enter the number of hours that the diesel generator is unavailable for emergency service. -Report the hours under the column reactor shutdown or reactor not shutdown as appropriate.

Comments: Comment on time to return to service after maintenance has 7

i begun, or other pertinent information.

1 Table 3 LER Abstract No. (Refer to attachad LER Abctracts): The attached LERs are m mbered starting from one. Refer to this LER number in column 4

one..

Each LER abstract should have an entry in this table. If there was a failure not included in the attached abstracts, please t.ssign it a number and enter it in this table.

1 Downtime Hours: Enter the number of hours that the diesel generator is unavailable for emergency service. Subdivide these total hours into troubleshooting, parts Jalivery, and repair or replacement.

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Comments: Use this column to comment on the downtine and the failure.

If the reported failure was only a technical specification violation, 4

l but would not be a complete failure of the diesel generator to supply powcr or would only be a delay, plaase elaborate in this 3

column.

Table 4 Equipment or procedure modified:. List in this column the equipment or procedures related to the emergency onsite power system that have i

been modified since the reactor became critical.

Date of Mod.:

Enter the date that the modification was completed.

J Reason for Modification and Desired Improvement: Report the reason for the modification and the desired or observed improvement in the system.

Description of Modification: Briefly describe what modification was made.

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Enclo:ure 1 - Pcg2 7 TABLE 1 Dissal Ctnsrcter Oparaticna Data Plcat Nino xxx (Sample)

Calzadcr Yesr 1976 Unic No.

1&'2 Reason for DC Number Number Percent Duration of Run Operation, & scheduled DC of of Loading of Before Stop For Identification of Failures Durs.tica c.f Run

_NL Starta Failures DC (KW)

Each DC Failure (Refer to attached LEHs or Table 3)

Tech. Spec Req'd Tcat Monthly Surveillance 1

12 2

100 30 min; O min LER f 1 & 4 (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />)

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2 12 0

100 (i start / test) 3 12 1

100 0 min LER #2 Refueling Outage 1

1 0

100 2

1 0

100 (12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />)

(6 start / test) 3 1

1 100 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1.ER f 3 i

Hisc. Tech Spec 1

2 0

100 Table 3 No. 9 Req'd Tests 2

4 0

100 x

(Start Only) 3 2

0 103 (I start / test)

DC Actual Demand Starts not for Testing I

SIAS Signal 1

1 0

0 LEn # 8 Multiple stort of 3 DGs (I hour) 2 1

0 0

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3 1

0 0

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Hiscellaneous Tests (Specify Type) 1 Verify Repairs 1

6 0

1 0 min Table 3'i 10

,i (not full test) 2 4

0 0

(S tart Only) 3 4

0 0

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'Enclosura 1 - Page 8 TABLE 2 Plcnt N:me

-(Sample)

Dicael Generator Sche,Iuled Downtime Record Unit No.

Calendar Year 19 _

Hours of Downtime Reason for Reactor shutdown Reactor not shutdown Comments Downtime Dyr Dgr Def DGF DGI

]I I

]f DGf DGf I

Scheduled Maintenance Preventive 24 16 16 Maintenance Se=i-annual &

Annual J

Equipment i

Hodtfication 8

8 8

Modified lube oil on eacia diesel.. Diesels j

down at different times.

1 1

1 1

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Time'DG is unavailable for emergency service because.of required testa 4

l Down 4 hrs per test 8

48 40 48 Diesel cannot be automatically started

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during test.or for three hours afterwards t

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. - Psge 9 tan'.E 3 Diesel Centrator linscheduled Downtime Racord Plcnt N me XXX Unt't No.

16 2 %. -

(Sample)

Calendar Year 19 N;

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• 'E LER Abstract He Downtime Hours 4

a ure un er emergency conM tions, please expiatu here.

- (nefer to attel

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• ed 1.ER Abstract s)llours shooting (very,ete (eplace i

1 4

1 1

2 2

3 0.5 1

1.5 3

12 1

10 1

4

,0 0

0 0

Diesel started in 15 see instead of required 10 sec s

5 0

0

.0 0

Secondary air pressure low. Primary air satisfactory.

1..

'6 0

0 0

0 Secondary air pressure low.

Primary air satisfactory.

7 0

0 0

0 Diesel started in 20 see instead of required 10 sec.

8 0

0 0

0 False DC start signal. DC satisfactqry j

Ho I.ER 9

0 0

0 0

Required DC starts after the failure of one diesel.

10 0

0 0

0 Starts to verify repairs.

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Enclosura.1 - Pags 10 TABLE 4 Onaire Emergency Diesel Ccnerator and Plant Nrme (Sample)

Auxillcry Equipment Hodification Record Unit No.

Equipment or Date of Reason for Hodification and procedure Hod.

Desired Improvement Description of Hodification modified Luba oil system 2/76 Improve turb'o charger lubrication Soak-hack pump was removed and replaced with a for emergency starts.

continuous lube oil pump.

New pump also continueusly lubricates the crankshaft.

Relay cabinets 1/78 Prevent dirt from fouling relay Cabinet doors with gaskets were installed.

contacts.

In.s t rument 6/79 Elininate vibration damage to Cbutrol and monitoring instrument panel was Relocation instruments relocated from the engine skids to a free standing panel mounted on the engine room floor.

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Enc 10sure: 2-1C3/S/0003301-6000005//'

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PAGE.

850-

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! ACCESSION MO.

00Z0135770

. COOLANT-TEMPdRATURE AT..

T I TLE'

, DIESEL GENERATOR-TRIP 5 OF HIGH JACAET VERMOMT Y AN KLE -

ICORPAUTH VER MON T ',Y ANK EE NUCLEAR power CORP., RulLAND,.VT

'DATE

1976 l TYPE o

.. 70-2/3L 10 NR C OF F I CL-~ OF 1 & E,1 REGION:

1,' FED.

MCMO-3.PGS, L1R.kA40

' 2. 3, 1976. DOCK LT L 60 -2 71, T Y 5 'E --B W R,

MFG--G.E.,

'AE --E B A S C O,

! AVA ICI AVAILAblLPTY.- NRC PUDLIC DOCUMENT ROOM, 1717 H STREET, WASHINGTON','D.

C.

.20S45 (06' CENTS /PAGE MININUM CHARGE

$P.00)

' ABSTRACT DAIE OF LVENT -~012478.

POWER LEVEL - 99%.

CAUSE a SE T POINI

. DRIFT IN 1 E MPE RA l VR E SW i l CH.. DURING TESTING.'DIEStL. GENERATOR

-A IRIPPED ON HIGH JACKET COOLANT-TEMPERATURE AFTER 7.5 HOURS i '

OPER AT I ON ' Al ' R AT ED LOAD.

'1HE IMMEDIATE C AUSE' W AS. bE T POINT l.'

DRIF T 'I N '1HE H IGH JACKET COOL ANT - T EMPERA T URE. SW ITCH. FROM FOS F 10 190 F.'

A PP AR EN T LY. I HERE :WAS A TEMPORARY ELOCKAGE IN THE AMOT 3-h AY" THERMOSI AT IC' VALVE, MODEL SB-170 WHICH SYPASSED AN r;

EXCESSI VE AMOUNI' OF ' COOL AN 1 AROUND THE HEAT' EXCHANGER.

THIS f

.COND1110N CE AS ED TO EXIS1 WHILE. CALIBRATING THE TEMPERTURE SW11CH.

! COMPONENT CODE. ENG INE-ENG I NLS,1 N IE RN AL-CONL4UST ION

! SYSTEM CODE EL-EMERG GENLR ATOR SYS & CON 1ROLS li93/S/0000001-0000005//-

2. -

! ACCESSION NO.

'00Z01360b7

! TITLE DIESEL GENERATOR FAILS TO START AT VERMONT YANKEE l CORPA UT H VERMONT YANKLE NUCLEAR POWER CORP., RUTLAND, V1 lDATE

'1977

! TYPE O

l MEMO 3 PGS, LlR W/RO-77-18/JL TO NRC OFFICE OF 1 L E.

RELION.1,"AUG.

19, 1977,, DOCK ET 50-271. T Y P E --E d R,

MFG--G.L.,

AE-EU A S CO IAVAll AVAILABILliY - NRC PUBLIC DOCUMENT ROOM, 1717 H STRELT.

WASHINGlON, D.

C.

' E054b (08 CENTS /PAGE -- MINIMUM CHARGE 42.00) l ABSTR ACT.

D AT L OF LVLh1 - 0726/7.

POWER LEVEL - 86%.

CAUSE - AIR 61 ART SLL E ND I D VALVES DINDING.

DIESEL GENERATOR \\ FAILED TO START DUR ING MONTHLY SURVEILLANCE I t S ~I I NG. '

THE t 3CO ' AIR START SOL E N O I D VALVES WERE DOUND IN THE CLOSED DIRECTION.

DCPRIS IN TFf LINE W AS DETERM INEO TU DE THE CAUSE OF 41NDING.

THE V ALV E S WERL REPA! RED AND RETURNED 10 SERVICL.

DURI.'G THE 1977

' REFUEL ING OU T A GE 1HL VALVES ON SOTH DICSELS WILL BE OVERHAULED.-

AT IHE NEXT AV AI L AO L E OPPORTUNllY, THE ASCO VALVES W I L L< 13 E REPLACLU WITH GR OVE HEA-FLO. VALVES WHICH ARE LESS SUSCEPTlHLE TO BINDING DUE TO DlHI ACCUMULAIION.

! COMPONENT CODE ENG INE-E NG I N ES,1 Nl E RN AL COMBUSTION l SYSTEM' CODE EL-EMERG GENERATOR SYS E CONTROLS

.93/5/0000001-0000005//

3 l ACCESSION NO.

. 0 0Z O126670 LTITLE.

DIESEL GENL R AT OR 1 RIPS ON'HIGH rR ANKC ASE PRLSSURE AT VERMONT YANAEE CORPAUTH VERMONI YANALE NUCLEAR POWER CORP., RUILAND, VT lDATE.

1977 TYPE-0 MEMO 3 PGS, LlR W /R O 17-3L TO NRC OFFICE OF 1 L E.

REGION 1,' JULY' 16, 1977. D O CK E l 60-271, T Y PE --B W N, M F b--G. E., AL--EUASCO l AVAIL' AVAILABILITY - NRC PUBLIC DOCUMENT ROOM, 1717 H STREET, WASHINGTON, D.

C.

2054b

( 0 6 CEN15/PAGE -- M I N I MUM CHARGE

$2 00) lAOSTRACT

.DATE'OF EVENT - 062377.

POnER LEVLL - 99%.

CAUSE - LOOSE CONNECllON IN AIR tJECTOR PIPANG.

DURING TESTING OF DIESEL GENERATOR B.

THE UNIT TRIPPED ON HIGH CRANKCASE PRESSURE, AFTER A00UT 13 MINUTES OF OPERAllON Al RATED LOAD.

IHERL WAS A LOOSE CONNECTION IN THE A IR EJECTOR SUPPLY PIPING.

A HOSE CLAMP ChNNECTING T HE AIR EJECIOR WlIH lHE SUPPLY PIPING FAILED DUE TO

. NORMAL ENG.N E VlbHAi!ON.

THE HOSE AND ALL HOSE CLAPPS WERE 4

REPLACED.

DUR ING IHE 1977 RE F UEL 1 rvG UUTAGE, HOSE CLAMPb OF A

.MORE REllABLE OLblGN WILL BE U T IL IZED.

COMPONENT CODE ' ENG INE -CNG INES,1Nl ERN AL COMOUSilON iSYSTEM CODE-EE-EMERG GtN LR AT OR SYS & CONIROLS i

1

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r 03/5/20C0001-0000005//

4 PAGE SSI ACCE?SION ruu.

00Z0116211

' TITLE

• DIESEL GLfLRATOR FULL HE ADER FilTING LEAKS \\T VERMONT YANKLE GURPAUTH VLHMON1 YANALE NUCLLAR P OW E R CURP., RUlLAND. VT DATE 19/6

. TYPE O

MEMO 3 PGS, LIR e /R O-7 6-26 /3L 10 NHC OFFICE OF 1 6 E,

REGION I,

5LPI. 24, 1976. DOChti 60-271, IYPE--UhR, MFG--G.E.,

AL -L B A SC O AVAIL A VA I L AB I L. I I Y - NRC PUtillC DOCUMEN1 ROOM. 1717 H SirLET, WALHINGION, D.

C.

20L4b (Un CENTS /PAGE -- MINIMUM CHARGE

$P.00)

AHSTR ACT C AU LE - NGRMAL ENGINL VlbRATlON.

DURINb lESilNG OF OltSEL GLNLRAIOR b wilH lsiL RLACIOR Al 95% r)U.! E R, SLIGHT Lt:AKAGE WAS OBLERVED Al A FULL HLADER FllllNG.

A PP A k ti N T LY, NORMAL ENGINC VIHkAllONS CAULED INL PELHANICAL CONNECTION 10 tiLCOML LOOSE.

ThL CONNLC11DN WAS liGHIENLO.

AN b HOUR LOAO lLSI WAb PLRFORMLU.

93/6/0000001-0000005//

L ACCES $105 NO.

00/011463P

'T1TLE DIESEL bl}tRAlOR TR IPS ON hIbH CRANKCALE PNEb5uRE AT VERMON1 Y Af 4 K L L CORPAUTH V '.;J4 N O N 1 YANKM NUCLLAR PowLR CORP.. RulLAND, VI DATE 1976

' TYPE O

MEMO 3 PGS. Llk W /R O-7t> - 10 /.5L 10 NNC OFFICc OF 1 6 E.

RLGION I,

JUNE 2.

1976. LOCKtI 60-271, I Y P E--it WR, twF L --G. ti.. AE--LOASCO

' AVAIL A VA IL ABI L11 Y - NF< C PUOLit DOCUMENT ROUM, 1717 H STREET, v/ASHINGTON, D.

C.

20545 (06 CENlb/PAlt - NINIMUM CHARGE S2.00) 6 l AUS TR AC T CAULL - U NA Ni s./ N.

PRIOR 10 AN IMPENDING LLECTRICAL ST OR fA,

OPtRATouS A l lE MP I E D TO L I AR I DIEbEL GdN:iR A T OR b.

WliHIN 1 M lfJUIL. INE UNil IR IPPLD ON hlGH LRANKCASE PRL56URE.

NO VibidLL LVIOL%Cc WAS Fourvo FOR F A I LUR L:.

THE UNIT WAS THEN RtbTAR1LD WITH S A 115F nL TIIRY HESULTS.

NJ CONHECTIVL ACTION WAS TAKLN.

PRELIMihARY I N V E bl I G A l 1 GN INO1CAlES 'lHAT THE CR AN A C A SE AIR LJECIOR IS ORAwlNG TOO LOW A VACUUM FROM liiE ENGINE CRANKCASE.

THE Ph03AHLE CAUSL 15 CLOGGING OF lhE EJECTOR SUPPLY O R I F I LE OR E JELIOR BODY IN THt CRANACASL bisLAlHER AND S UP PL Y SY S T E f 4.

ThL HbACIOR WAS Ai 100% P O W E.7.

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VERMONT YAN KEE NUCLEAR POWER CORPORATION 4

SEVENTY SEVEN GROVE STRCc7 RUTLAND. VERMONT 05701 REPLYTo:

ENGINEERING OFFICE TURNPtKE RO AD WESTDORO, M ASS ACHUSETTS 01581 TELEPHONE 617 366 901I WY 78-13'N

,-m February 2, 1978

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United States Nuclear Regulatory Con:nission t'

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Washington, D. C.

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Attention: Office of Nuclear Reactor Regulation

Reference:

(1) License No. DPR-28

.?ocket No. 50-271)

(2) USNRC letter to Reactor Licensees, dated 12/15/77 (3) VYNPC letter, WY 78-3, to USNRC, dated 1/16/78

Subject:

Standby Diesel Generator Units Questionnaire Enclosed you will find a completed questionnaire pertaining to the Vermont Yankee Standby Diesel Generator Units. This information is provided in accordance with the requireuents of References (2) and (3).

We trust that you will find this information satisfactory.

Additional infor=ation pertaining to this topic may be obtained by contacting Mr. W. F. Conway, Plant Superintendent.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION A

Robert H. Groce Licensing Engineer RHG/kg Enclosure i

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Are' any foreien cases 'such as propane, freon, halon,. carbon -

dioxide, etc. stored in the:

Diesel Engine recm?

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Yes No x or -acjacent buildings? Yes

'No X

-If. yes, (other than hand portaole fire extinguishers), then

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identify gases and give ap;roximate tank size.

3 Gases Volume (ft )

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Does contrcl ~ system automatically bypass, in emergency starting,,any engine temporarily out of service for maintenance? Yes x

No l

l-If yes, then how many failures to bypass have occured?

U.

Does the control system aut:natically override tne test mode under energency conditions? Yes No y

V.

Have repetitive mechanical failures occurred in any ccaponent part or subsystem of the engine, generator, or switen gear, etc.?

Yes X No If yes, then which part or subsystem?

44. senvr l

How many failures?

nional as"_7 n4acoi n_1 Give nature of failure.

Air start solenoid valves stuck. usually caused by dirt in line.

W.

Would periodic (yearly or other) evaluation and/or testing by "outside experts" centrica 2 significantly :: :,e diesel-l generator reliability? Yes No x

Give brief reasons for the.2ns..er.

"1,nt narennnal nra qualified to_

provide normal maintenance. onerneinn nna enceing.

vnnnfnceurer's-l representatives provide adeaunte sunnore uhon -ncut-na-Mo' S

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Give the accumulated tice-load operating record for each diesel-generator unit from installation to the present (9unning-Hears):

' Preo::erational test Date Jan. 1971 Engine Sury. Testing 4- :

Emergency Total

Serial !.o. :

Maintenance Mrs. :

and Otner Hoers

_ No lead : Loaced :

Service Hrs. :

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915

}TDSM12 38D8700ll j 5

Diesel A 940 20

38D870006 :

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Diesel B

TDSM12 -

10 945 20 975

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Surveillance test load (' percent of continuous rating). 90-100%

3.

Give the projected or clannec time-load oceration for i

each diesel-generator unit curing the next 12 months.

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Surveillance 4 Emergency. :

Total

Maintenance Mrs. :

and other :

Hours Service Mrs. :

i 96 0

96 4.

Provide the following sunnary of the periccic surveillance tes:f ;

experience:

a.

Starting date of surveillance testing (OL date)

Feb. 18. 1972 b.

Periodic tett interval monthly c.

Totti nue.'er of surveillar:e tests cerforned acerox 110 ner diesel-d.

Total nuncer of est failures 8

failure to start 2

f ailure to accept load o

failure to carrf icad -

6 failures cue to ccera:ce err;"

- n failure due to ecuinnent. no ceino c erative curing ererge cy l

conditiens 0

e.

Supply a copy of the surveillance tes crececures with this l

c:noletea cues tiennaire.

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