ML20009H181

Requests That Encl Tabular Questionnaire Be Completed,In Support of Resolution of Unresolved Safety Issue A-44 Re Station Blackout & Reliability of Onsite Standby Diesel Generators.Ler Documentation Docketed for Facility Encl

ML20009H181
Person / Time
Site:	Rancho Seco
Issue date:	07/21/1981
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR TAC-43938, NUDOCS 8108060385
Download: ML20009H181 (19)

Text

.

'AILY 21 $

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Docket tio. 50-312 s

ryG 0 0 esm-Fr. J. J. Mattimoe, Assistant General Manager and Chief Engineer y,, p# a % j,c Sacramento Munic$nal Utility District

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F201 S Street M

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Post Office Box 15830 Sacramento, Ca'Ifornia 95813

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Subject:

Infomation Recuest Regarding Station Blackout, Unresolved Safety Issue A-44, Rancho Seco fluclear Generating Station The fiRC staff is currently addressing Unresolved Safety Issue (USI)

A-44, Station Blackout.

The purpose of this work is to establish the sarcty 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 th t is being used in the USI analysis. Your interest and cooperation in the past have been appreciated.

At this time the USI A-44 cffort is being directed toward detemining the reliabilit of the onsite standby diesel generators. The enclosed questionnaire h:s been prepared to provide accurate operating experience to serve as a basis for such a detemination. More specifically, its purpose is to obtain more detailed data than were available in previous diesel cenerator studies such as AEC-00E-ES-002, NUREG/CR-0660, and flDREG/CR-1362.

The questionnaire (enclosure 1) requests infomation in t_bular fom and solicits data for the years 1976 through 1930, inclusive. There are four tables enclosed:

(1) Diesel Generator Operations Data. (2) Diesel Generator Scheduled Down Time Record, (3) Diccel Generator Unscheduled Down Tine Record, and (4) Onsite Energency Diesel Generator and Auxiliary gg

--o Equipment Modification Record. Also enclosed are examples of completed R8' tables as well as a clarification of what thould be entered. Please 38 note that, although it nay appear that e7ly Licensee Event Report (LER) mn infomation is sought, data on all dies. generator malfunctions, independent of whether an LER was prepared, is requested.

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too Please find enclosed LER documentation (enclosure ?.) presently docketed o$

for your facility. Yom are requested to review these and to ' indicate if

,i 8e there are other reports which have not been enclosed. Finally, please find enclosed a copy of the appropriate pnrtions of your response (enclosure

y o

o lir. J. J. Mattimoe 3) to our letter of ffarch 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 information, 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 c:-

energency 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 information 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 requirenants 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 to 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 "anager 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.

l DISTRIBUTION cocWt n le _50-31g) J. Heltemes Sincerely, NRC & Local FCRs ACRS (10)

"gDRIGIML SIGE:D Br l

ORB #4 Reading OELD l

GIB Reading ISE (3)

J0M F. sroLIZ=

D. Eisenhut T. Murley R. Purple F. Schroeder John Stolz, Chief J. Roe K. Kniel Operating Reactors Branch #4 T. Novak P. Norian Division of Licensing J. Stolz P. Baranowsky

Enclosures:

M. Padovan As Stated R. Ingram J. Butts Gray File H0rnstein cc: w/cnclosures EBlac.kwood See next page This request for infornation was approved by the Office of Management and Budget under clearance nunber 3150-0067 which expires May 31, 1983.

Coments on burden and duplication may be directed to the Office of Manaqcment and Pudget, Washington, D. C.

20503.

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JStol k 3..O.f.81

,07 p /81 07/M/81 07/p/81 onry me ronu m oo sa Nacno OFFICI AL RECORD COPY w,o mi._mw

Sacramento Municipal Utility Rancho Seco, Docket No. 50-312 District cc w/ enclosure (s):

David S. Kaplan, Secretary and Christopher Ellison, Esq.

General Counsel Dian Grueuich, Esq.

6201 S Street California Energy Commission P. O. Box 15830 1111 Howe Avenue Sacramento, California 95813 Sacramento, California 95825 Sacramento County Ms. Eleanor Schwartz Board of Supervisors California State Office 827 7th Street, Room 424 600 Pennsylvania Avenue, S.E., Rm. 201 Sacramento, California 95814 Washington, D. C.

20003 Business and Municipal Department Docketing and Service Section Sacramento City-County Library Office of the Secretary 828.I Street U.S. Nuclear Regulatory Commission Sacramento, California 95814 Washington, D. C.

20555 Resident Inspector / Rancho 56su c/o U. S. N. R. C.

14410 Twin Cities Road Herald, LA 95638 Dr. Richard F. Cole Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Commission U. S. Environmental Protection Agency Washington, D. C.

20555 Region IX Office ATTN:

EIS COORDINATOR Mr. Frederick J. Shon 215 Fremont Street Atomic Safety and Licensing Board San Francisco, California 94111 Panel U.S. Nuclear Regulatory Commission Mr. Robert B. Borsum Washington, D. C.

20555 Babcock & Wilcox Nuclear Power Generation Division Elizabeth S. Bowers, Esq.

Suite 420, 7735 Old Georgetown Road Chairman, Atomic Safety and Bethesda, Maryland 20014 Licensing Board Panel U.S. Nuclear Regulatory Commission Thomas Baxter, Esq.

Washington, D. C.

20555 Shaw, Pittman, Potts & Trowbridge 3

1800 M Street, N.W.

Mr. Michael R. Eaton Washington, D. C.

20036 Energy Issues Coordinator Sierra Club Legislative Office Herbert H. Brown, Esq.

1107 9th Street, Room 1020 Lawrence Coe Lanpher, Esq.

Sacramento, California 95814 Hill, Christopher and Phillips, P.C.

1900 M Street, N.W.

Atomic Safety and Licensing Board Washington, D. C.

20036 Panel U.S. Nuclear Regulatory Commission Helen Hubbard Washington, D. C.

20555 P. O. Box 63 Sunol, California 94586

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Sacramento Municipal Utility District l

Atomic Safety and Licensing Appeal Board Panel l

U.S. Nuclear Regulatory Comission l

Washington, D. C.

20555 i

Alan S. Rosenthal, Chairman' l

Atomic Safety and Licensing Appeal Board U. S. fluclear Regulatory Commission Washington, D. C.

20555 Dr. John H. Buck Atonic Safety and Licensing Appeal Board j

U. S. *1uclear Regulatory Comission Washington, D. C.

20555 t-Christine N. Kohl Atomic Safety and Licensing Appeal Board U. S. iluclear Regulatory Comission Washington, D. C.

20555 California Department of Health ATTN: Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 l

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Hours of Downtime Reason for Reactor shutdown Downtime Reactor not shutdown Comments ucy ocy ocy ocy puy DGf DGf DC#

DCf DCf Scheduled Haintenance l

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Enciccurs 1 - Fage 5 TABLE ENTRIES

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' EXPLANATION / CLARIFICATION

. Table 1 l

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 j

all of the tests in a category. In this column, enter the scheduled i

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 cn the monthly test there is one start from the local con-crois and one start from the remote controls, the number of starts i

per test is two.

If two or more diesels are started simultaneously j

for any reason, please record it as a multiple start.

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i DG No.: Enter each diesel generator's identification number in this column j

as shown in the example.

?

Number of Starts: Enter the sun of the successful and unsuccessful start l

attempts for each category. If there are several starts for each test, i

include all of them, but be certain to record the number of starts per test in column one.

Number of Failures: Enter the sum of the failures for each category. A j

failure is counted if the objectives of the test are not achieved. A i

subsystem failure that does not cause failure of the diesel generator J

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 l

recorded. However, if the diesel generator would.have supplied power in some capacity for an emergency, please explain in Table 3.

For l

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

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problem in an emergency, this should be noted in Table 3.

Percent Loading of DG OKW): Enter the percentage that the diesel is l

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 a

be O min.

Identification of Failures: Attached to this questionnaire are abstracts i

of the LERs related to the diesel generators. The abstracts are numbered l

starting with one. Refer to this number to tdentify the failures, but if enere was a failure for which there is no abstract, assign the failure a number and include it in Table 3.

4 I

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 that also.

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Enclo:ura 1 - Pag 2 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: Comesnt on time to return to service after maintenance has begun, or other pertinent information.

Table 3 LER Abstract No. (Refer to attached LER Abstracts): The attached LERs are numbered starting from one. Refer to this LER number in column one.

Each LER abstract shou' d have an entry in this table.

If I

there was a failure not included in the attached abstracts, please assign it a number and enter it in this table.

Downtime Hours:

Enger the number of hours that the diesel generator is unavailable for emergency service.

Subdivide these total hours into troubleshooting, parts delivery, and repair or replacement.

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

If the reported failure was only a technical specification violation, but would not be a complete failure of the diesel generator to supply power of would only be a delay, please elaborate in this column.

Table 4 Equipment or procedura modified: List in this column the equipment 4

i or procedures related to the emergency onsite power system that have been modified since the reactor became critical.

1 Date of Mod.: Enter the date that the modification was completed.

Reason fcr Modification and Desired Improvement: Report the reason l

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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Encicsuro 1 - Pcg2 8 TABLE 2 Plcr.: Name (Srple)

Dicoal C2ceretor Scheduled Downtime Record Unit No.

Calendar Year 19_

Hours of Downtin:e Raason for Reactor shutdown Reactor not shutdown Comments Downtime f

f f

DGF DCf f

f f

DCf DCJ Scheduled Haintenance Preventive 24 16 16 Maintenance Semi-annual &

Annual

)

Equipment Hodification 8

8 8

Hodified lube oil on each diesel. Diesele down at different times.

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Time DC is unovoilable for emergency service because of required testa Down 4 hrs per test 8

48 40 48 Diesel cannot be autcoatically started during test or for three hours af terwards i

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. ARI.E 3 Diesel Cenarctor Unscheduled Downtime R ccrd Fic t N me XIX (Sample)

Calendar Year 19 _

Unt't No.

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IER Abstract Ni Downtime llours C - nts - It any of the reported failures would not have been a (Refer to attel a ure un er emergency conditio.1s, please explain tiere.

ed 1.ER Abstrace s) Total Trouble-l'a r t s, De l - Repair /

Refer to attached LERs or the failures listed in Table 1.

llours shooting tvery,etc teplace 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 5

0 0

0 0

Secondary air pressure low. Primary air satisfactory.

6 0

0 0

0 Seconda':y air pressure low. Primary air satisfactory.

7 O

O O

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

8 0

0 0

0 False DG start signal. DC sattafectqry No 1.ER 9

0 0

0 0

Required DG starts after the icilure of one diesel.

10 0

0 0

0 Starts *o verify repairs.

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" - Peg 2 to TABLE 4 Onnite Emergrncy Diesel Centrator end Pleist Hanne (Sample)

Aux 111ery Equipment Hodification Record Unit No.

Equipment or Date of Reason for Hodification and procedure Hod.

Desired Improvement Description of Modification i

modified 1.ube oil system 2/76 Improve turb'o ch'arger lubrication Soak-hack pump was removed and replaced with a for emergency starts, continuous lube oil pump. New pump also continuously lubricates the crankshaft.

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

Instrument 6/79 Eliminate vibration damage to Cbatrol and monitoring instriaient panel was Relocation instrument, relocated from the engine skids to a free standing panel mounted on the engine room

floor, i

, PAoC c33 bo /S / O O L.i; O I -0 0 0 0013 / /

I ACCL6b!ON.NU.

0 02 C 163 b24 TIILL altSEL GLNERATUw FAILS 10 b1 ART Al RANCHO SECC CORPAUTH S AC b A b.E N T O kUN IC I PA L UI!L. DISTRICT

. ' Al C l 'vb I TYPt Q

MEMU L ik w/LCR 60-049 TO U.S.

NRC. RE b lON 5.

JAN 13. 1961. DOCKET 5C-312. l Y P E --Pw k. M F G --6 6 w. AE --btC H. DCS NO.--ol012OO281 NRL PUbLIC DOCUMENT ROOM. 1717 H STREET.

/. All AVAILAblL1TY WASHINGlON.

v.

C.

205bb (Ob CcNTS/PAGE -- MINIMMM CHARGE 50.00) 100%.

CAUSE - UNKNOWN.

1219e0.

POWER LEVEL AUST9AC1 D Af t GF LvtN1 THE 3 DICSEL GENERAlOR FAILED TO START DUR ING ITS MONTHLY bukVEILLANCt TEST.

A SECOND STAR 1 ATTEMPT ALSO PROVED UNSUCCESbFUL.

DURING THE TROUBLESHOOTING EFFORT NUMEROUS COMPONENTS

• tR C TES1CD.

SEVERAL COMPONENTS WERE REPLACED; INCLUDING THt kELAY TACHOMETCR. A SPEED CONTROL SwlTCH. AND AIR SlAWT NOTLRS.

11 WAS DETERMINED THAT. BASED UPON INITIAL 06SERVA T IONS OF T HE UNSUCChS5FUL START ATTEMPTS, NONC OF THE REPLACCD COMPONENTS wCULD HAVE CAUSc0 THE INITIAL FAILURE TO SIART.

AP7%N SUCCESSFULLY PASSING THE MONTHLY SURVEILLANCE TtdT. ThC U P.1 T WAS DECLARED OPEkABLE.

COMP u hE t.1 CUDE E NG int-LNG I neb I N TERNAL COMOUSTION SYb1EN COUC th-EMERG GENLRATOW SYo L CONTROLS 58/5/0000001-u000013//

2 ACLEbblGN NO.

00Z01603tb TITLc DICSEL CLNLkATOR FAILS TO REACH HATED VOLTAGE AT RANCHO SECO LOHPAUTh bACAAFCN1C NUN IC I PA L U11L. DISTRIC T DAlt 1%ob TYPr o

MtMb L ll< V/Lth (30-041 TU U.S.

NRC. REGION

5. ShP 22. 19eO. DOCKET 5 0- J 1 c. fYr% ~PwR.

NFG-bL w. A E -b CCH AVAll AVAILALILITY - NH C PubLIC DOCUMLNT ROOM. 1717 H STREET.

WASHINGlUA.

v.

C.

20bbb tus CCNT5/PAGE -- MINIMUM CHARGE

%L UO!

AbSlk ACT U-I E OF tVcNT - 0u2360.

POWER LEVEL - 000%.

CAUSE - VOLTAGE ktGULAion FAILukE.

• MILE PERFORMING THE DIESEL GtNERATOR "B"

d1NCHRON14AT10N SU4VEILLANCE TEST. Il WAS NOTcD THAT THC UNIT Ulb NOT ACHleVC RATCD VOL1AGC.

THE CAUSE WAS ATTRIBUTED TO THE vbLTAbt nEGULA10R.

A WORK REGUEST WAS INITIALED AND THE

/OLlAGE RtGULATOW wAS RescT.

C09PUNENT CLut INST R U-1NST RUMcN T AT ION AND CUNTROL5 bYb i t M CODt EL-EMERG GCNERATOk SYS L CONTROLS

$t/t/C000001-0000013//

3 ACCELLION NO.

OOZultus!O TITLE UltbEL GCNLaATOR FAILS.TD REACH FULL VCLTACE IN TIME AT RANCHO 5CCO CORDALTH S ACH AMt N TO k.L.1 1C 1 P A L UTIL. DISTRICT DAIL 1960 TYPL 0

MCMU LIR W/LCs60-024 TO U.S.

NRC. REGION S,

APR 30.

196C. DOCKET 50-312. 1 Y P C --PW R.

f..F G --9 6 W. A E --G ECH AVAIL AVAILAUILilY - NRC PUBLIC DOCUMENT NOUM. 1717 H STREET.

WASHINGlON.

U.

C.

20566 (08 CENTb/PAGE -- MINIMUM CHARCE L2.09)

Abb TR At l DATc GF tVENT - 040960.

POhER LEVtL - 000%.

CAUSE - GOVERNOR CCO5ThR PUMP NUT COUPLEO.

DURING THE PE R F OR M A N CE OF FUNCTIOtJ TLS1 OF NUCLLAH SERVICE BUS A UNLO A0l NG SCHEME. THt "Aa DIESCL GtNERATDh F A ILED TO MEET THE TIME CRITERIA (<10 SCCGNDS) TO RLACH FULL V UL T A G E.

SUB SE QUEN T START TESTS ONCE THE UNIT WAS AT UPCHA11NC TEMPERATURES REDUCED THE TIME SPAN buT WERE STILL UNACCEPTAcLL.

THt GO VE R NOR ACCUMULATOR BOOSTER PUMP WAS NOT CvuPLED AtJD AS A RESULT NOT OPERABLE.

SINCE MAINTENANCE R LCOR DS DO NOl INDICATE THAT THE COUPLING WAS EVCR REMOVED. IT IL ASSURtD T HA T IT WAb NEVER COUPLED DUR IN G IN111AL I NS1 ALL AT I ON.

A COUPLING w AS FAhRICATED AND INSTALLED.

SU3LEOULNT ltSTS ME1 THE REQUIRED TIME CRITERIA.

COf tPut4Lis i LOub MECfUN-NCCHANICAL FUNCT1ON UNITS SYbTL4 COUC EL-LMLHG GENL4 AT OR SYb & CONTROLS

$e/L/000t4G01-0000013//

4 ACLL5LIGN NO.

0020166640 TITLt DetbEL btNCRATOR DC AlH STAR 1 bYbitN FAILS Al RANCHO SELO 1

c_

e CON 11NUATION 1

PAGE c56 60 /t, /6 0 00 0 01 -C 0 0 0013 / /

l Cord PA U T H t ACH A kt Nlu kVN IC IP AL bTIL. DISTRIC1 lDAll laseO

TYPE O

MEMU L TR W/LER 60-013 TO U.S.

NRC. REGION b.

MAR 7.

1980.

DOCAtT S0-312.

T Y P t --P a k. AF G --BL w. A E --b E C H AVAIL AVAILAolL11Y - NRC PUhLIC DOCUMEN1 ROOM, 1717 H STREET.

FINIMUM CHARGE WASHINGlON.

D.

O.

20bb5 (0e CENTS /PAGE 52 00)

AHS1RACT O AT E OF cVENI - 021660.

POWER LEVEL - 000%.

CAUSE - LEAKING HUSE. FULLOwlNG 1HE SIANNUAL INSPECTION OF THE "B"

DIESEL GENERA 1DR. A P h0 b LE M ASSOCIATED W11H THE D.C.

AIR START SYSTEM WAL NOTED.

SU DS C OU E N1 TES1b OF 1HL D.C.

AIR START SYSTEM PROVED UNSU C CE SSF UL.

A FLEX 1bLE 3/b-INCH LINE IN THE SYSTEM HAD WORN AND WAS LEAKING.

lHE bECTION OF l'LE X 1 BLE LINE WAS RLPLACtb AND bu3SCOULNT TESTb WERE SUCCESSFUL.

SINCE THE D.C.

AIR $TAAT t v bT cM lb FULLY R CDUN DAN T TO THE A.C.

AIR START SYSTEM, NO s1 A RT FAILURES WERE AT1R16UTED TO THIS OCCURNENCE.

T HE CAUEE l b A SSUME D 10 BE "NATUHAL END OF LIFE" FOR THE FLEAIDLE bY NIH E31C RUHeER LINE.

ALL SIMILAR LINES ON BOTH THE A.C. AND D.C.

AIR 61 ART bYb7 lmb AND ON BOTH DIESEL GENERATORS

• 1LL UE RE P L AC ED.

COMPONENT C O.>E P IPE A A-PIPEb.F IT T INCL SYb f L M CCUC EE-tMLAG GENCRATON SYS & CON 1ROLd L.1/5/0000001-OO30013//

5 ALLt$blCN N7.

00Z0150039 lliLu DitbEL OENCRATOR FAILb TO STARf FROM CONTROL ROOM AT RANCHO SCCO C7HPAulH SALHAMCNTO MUN IC I PA L UTiL. D15TRICT LAlt 1%be TYPC L

MLMO L1k W/Les60-012 TU U.S.

NRC. RdGION 5,

MAR 6.

1960.

DOCKET oC-31i.

l Y P L --P m A. mFu--bLw. Ah--HtCH AV%IL AVA ILAn lLI T Y - NRC PUULIC DOCUMENT ROOM. 1717 H bTREET.

MINIMUM CHARGE MASHING 1UN.

u.

C.

20dbb (08 CCN15/PAGE s.2 00)

A b b i:< A C T U Al t CF tvCN1 - 021960.

PO*ER L'd V EL - 000%.

CAUSE - PIECE OF MET AL d l u C t.

IN RLLAY.

THE "A"

DIEbbL GE NER A T OR FAILED TO STAR T ekOM THL CUNikOL RJOM.

A PIECE UF METAL WAS STUCK IN A RELAY.

IHlb PNPVENICO FULL MOVEMEPT OF THE RELAYS ARMATURE AND THCREBY PREVCNTLD THu RCLAY FROM CLOblNG.

THE RELAY 15 WITHIN THE 51Ah! LlhCull FOR THE dLPu IN THC CONTROL ROOM.

HO WE V ER. THE SFAb blAhi C GN T A C ! b UYPASS THE RtLAY AND THE D1hSEL WOULD HAVE STARIEb UN AN SFAd blGNAL.

DUE TO RECENT WORK IN THE R2 LAY PANLL (ALDINb NEW C AbLE AND TERMINATING WIRES). THE PICCE OF MCTAL WAt UEIERMINED TO DE A PIECC OF TERMINAL LUG.

THIS WAS REMOVED ANO dudStOutNT. START TESTb WERE SUCCLSSFUL.

COMPONtN1 LOOE R LL AY i-hhLAY S SYSTEM COUb LE-LMLRL GE nth AT OR SYS & CONTROLS 50 /b / 0 0 00 u 01 -0 00 0013 / /

6 ACCES$10N NO.

0020163673 TITLL blCbCL Or NLh AT OR FAILS TO START Al RANCHO SECO LbetPAUTH SALRAMEN10 MUN IC tPAL UTIL. DlbTRILT Daft 1979 1YPt 0

MLMU L'h W/LEh 74-017 TO U.S.

NRC. REGION 5.

DEC O*.

1979. DOCKET S0-312.

T Y Ph --PW R,

MPG--c+W.

AE--GECH CONTROL--027049 AVAIL AVAILAh!LIIY - NRC PUdLIC DOCUMENT ROUM. 1717 H STREET.

W Abh l N610N D.C.

20555. (06 /PAGE -- M I N I MUM CHARGE 52.00) 100%. CAUSE - NOT And1HACT DATE OF EVhNT - 110979. POWER LEVEL DETcRMINED THt "A"

DICSEL GENERATOR FAILED TU START FROM THE CONTROL HUOM.

AF1Eh A bbCOND UNS UCCE SSF U L ATTEMPT. THE k tD UN D A P. ! DlhSEL GENERATON was SIARitD AND OPER ATORS D ISP A TCHE D TO LULALLY 51 ART THE UNIT.

UPON LAKING LOCAL CON 1ROL. THE UNIT WAb S 1 A h l t L' TWICL LOCALLY AND ONCE FROM THE CONTROL ROOM.

SINCI ThEN in; UNIT HAb BEEN SUCLESSFULLY STARTED 8 TIMES J 11 HOU1 PHubLCMS.

CAUSE OF THE b 1 AR T FAILURES 15 UNKNOWN.

TO AbbudC CONP l wE NC E IN IHt UNIT'S S1AkTING AHILITY. IT WAS 51AhIbb DAILY FOR T Nt NEXT 4 DAYS.

THE UNIT HAS BEEN STARTED 0;. A btPAhAT-OCsASIONS blNCE THAT 11Mk.

NO HCCURRENCE OF THE bIART PRbdLbN MAS tNLQUNTERED.

CONPbNtNT CODE tNGINh-bNLINCS.!NTERNAL COMGUS T ICN SYsTEY CODL L C -t Mt 4 6 GCNER AT OR SYb L CON 1ROLb A

b',/b/OO( 'e. 1-000Uu1J//

7 AdCLbCION

• Y.

11 I La J Li c l

• s 70t-PAGE C

LU4PAufH Ulh5LL GENT RA I 04 INUPLRAbLt CAIE 6 ACh AMt.NIG MUN IC I PA L UllLIIY AT RANCHO SECO 1YPt 197o ML atu U

0151hlCT. SACRAMEN10. CA 3 Pob. L1h w /R O 76-10 REu!ON V.

NOV.

b.

1976 10 NRC OIRECTOR OF REGULATORY AVAIL A L--S EL H T E L DOCKET 50-312. TYPE--par.

OPENA T I ONS.

A VA I L Als !L i 1 Y AASHINuTON.

O.

C.

PUULIC OOCUMENT MF G-O L w.

- NRL ROOM. 1717 H STRCET.

20Sbb (08 CENTb/PAGE AbbiRACI 52 00)

UA1L OF E VEN 1 MINIMUM CHARGt 102470.

POWER LEVEL r:Ubb 5 IN LON TR OL POdEk CIRCUIT.

100%.

CAUSE

• ITH THC "H"

OltStL GENERAIOR DUT OF SLRVICE.

DUR ING STEADY BLOWN THE "A"

blL5LL GE NE RA 10k ETATE OPE R A l l CL t WAb OUE OPERAbIL 1iY OF wA5 LOST FOR A60UT 7 HOURS.THE LOSS RCVEALeL 10 PRO 6L LMS wtTH THE VOLTAGE RtiGUL 1HA8 1HL PRIMARY FUbEb ON THC CONTROL FOR THE VOL1 AGE INVES11GATION PhuuLEMS wtRt.

htuuLATOR HAO FAILEO.

NO OTHER APPARENT POWER CIRCU1T 315CuVEMED. THE I sib lib ANv l e*d. N CGMPurCLN 1 CUJt FUSC5 wERC REPLACLD. THE UNIT I Nb TH U-INb ThUMcN T AT l GNRETURNEO IO SERV 1CE.

SYb iE M Cost E C-LMEk G bttstR ATOR A ND CONTROLL

5) b & CONTROLS ACCESSIONbo /b /O O GuG O I-0 00 0U L 3 //

NG.

L TITLE 00201414b5 CVWAUTH ubl H D 1 c. 5b L bE NL.R A1 UR S ItsOPEkAOLE L ACE AME N10 NUN IC IPA L UAlc 51 MUL TA NEOUSL Y Iv7n UTILITY DISTRICT. SACRAMcNTO. CA TYp AT RANCHO SECO ML40

')

i 3 PGS. LTh * /H O 7L-l*

ktGION V.

OC T.

17 197e.

10 NRC DIRECTOR OF AVAIL At--dECHTEL AVAILAblL11Y DUCnET $0-312.

REGULATORY 1 YPr. --P w R.

OPER A T I ONS.

I

- NRC PUOLIC UOCUMht4T MFG--bCW.

WASHING lON.

D.

C.

2Obbb ROOM.

AUS TN AG T M.. n.h> )

(06 CtiNTb/PAGE 1717 H STRCCT.

J Al t UF tVENI

-- MININUM CHARGE SPHAY]t.G #:kUM 1 0 0 *. 7 6.

POWER LCVEL LOU LL PACKING GLAND.

DURING STEADY STATC i

UPERAllON allH IHL "U" D i b 5tiL GENERATOR OUT OF SERV 100%.

CAUSE - F UE L UIL THE "A"

O!L5tL GENEhATOR L GOSErw 1 % OF T Hei P WAS TEMPORARILY F UL L DIL Tu tDkAY UUT.

ALKINb GLAND Ot A FUEL Ull STRAINE LOST.

c x CE S S I V E.

i Tl'Hithlhu Titi GLAND hMILt THE ole 5tL WA AS A LOCATION OF THE STRAINER RELULT. 1 Hli UN I T WA S SHUT DO*N PRtVENTED s AL61 N6 BLAND WAS T I C HTENtiD AND DIES l

AML INVLLT IGAT ING THE

' CC"@ OtstN1 CULE 374AINEhb.

Et-LMERGL NG I NL -E t.G I NbS. I N 1 E RN ALPObb

b(51 t A COOC OF COMBUSTION GENER A10h $fS L CCNTROLS b3 /*a /O O O v u o l -O L ss OO l 3 / /

ACCE5bluN Nis.

4 fl(LE 004u125140 CU4PAUth N SR W Pu h.P Fuk D! ti b= L FAILS TO DA TL L* CWAMCNTO MUN IC I PA L UllLITY AUT O-bf AR T TYIPE 1977 MLith G

D1b1RICT.

AT RANCHO SECD

-- ~~' '

SACRAMENTO. CA 3 PGb. L14 w /4 0 7/-l 10 NRL DlkELTOR OF kLGIUN V.

kARCH 7 I977 DOCKET l AVAIL At--SECHitL A ValL AD I L I 1 Y b 0 -312. REGULATORY TYPh--PWR, OPERATIONS.

PUllLIC DOCUMENT MFG -BLh, NRC

.AbHINb1DN.

O.

C.

ROOM. 1717 H STREET.

AubV4ACT 12 00)

Pub 4b (Vo CCNib/PAGE DAlt LF e Vt N I

- MINIMUM CHARGE LalTCh 021477.

POktR LEVEL LTAkiEUAC10ATED ON PUMP 100%.

BREAKER.

OlESEL CAUbE - RESET FOh A 1EST.

NUCLEAR SERVICE R AW GENER A TOR A WAS SUPPLI L S COOL!rsG WALER TU THL 01 CvuLD NOT HE STARIED WATER PUMP A WHICH UI.

THE PUFP LAtAKLR WHICH CLEARED MANUALLY.

1HE REGET bh!TCH WAS ACTUATED FLAG ttAU NOT blGNALbu.

A ND RebtT. A RELAY 4Ad MSARD TO ACTUATE.

THE PUf4P WHtN THC CONTROL SW11CH WAb MOVC LTAhTCD.

VOL1 NO PROblE M WAS MMPONbNT COLL CARLull 0: 1EP LouE C Al uM K-C IR Cu l To sti AKE rs.

FOUND WITH THE l-T-E MODEL SHK. 4160 wAS THEN CLUSERb/lNIEkRUPILdb

.v A-bl n T I UN Sun V i

WATLR SYb & CONT

PAGC 058 0d /*.3 /0 D u 0 0 01 -00 0 0J 14 / /

10 ACCLbS I ON NO.

0 04 010 u 701 llILt blE5CL G r. N L H A T OR TRIPb DURING 1 E S T it.b AT RANCHO SCCO CLRPAUTn L ACR AMENID MW IC IPA L* UT ILI T Y D I S1 R I C1. bACHAMEN10. CA DAIE 197o TYPL c

MLt40 3 PGS. LIR w /N O 7b-10 TO NRC DIRCCTOR OF REGULATORY OPERATIONS.

j R Eb luN V.

D E L. 22. 197o. DOCKE1 50-312. T Y PE --P W R, MFG 3GW.

AE--3ECHTEL AV,61L AVAILAe!LITY - NRC PUBL I C DOCUMEN T ROOM. 1717 H STREET.

MINIMUM CHARGE 4 ASHING 1Uc.,

D.

C.

20645 (Ob CENTS /PAGE si.uJ)

CD: T RO L SwllCH Fs.!LS CLOSED.

wHILE THE REACTOR WAS AT ALSTR ACT C AU SE 100% Plack, u!CSEL GENERATOR A TRIPPED OFF LINC 2b MINUTES INTO A 1-NR SURVCP. LANCE TEST WHEN THE SPEED WA5 DECREASED BY THE I

CONTROL HOOM SWITCH.

THc MASTER SPECIALTIES SERIES 2!00 4010-1 ELL 11E dw!TCH FAILED IN THE CLOSED POSIT!UN CAUSING ThE SPECD 10 CONTINUE TO DECHEASL UNTIL THE DG TRIPPED.

THC DiFtC T I VL b w TI CH hA S REPLACED.

l 64 / b / 0 0 0 C 0 01 -00 0 0013 / /

11 l ACCEbblON Nu.

004011u907 TlfLC DIEbet GENE R AT CR FAILS TO START AT RANCHO SECO i L O Al-A U 1 H 5ACkAhENTO MUN IC I PA L UTILITY DISTRICT. SACRAMENTO. CA l Dalt 197c 1fPc u

> Mt t40 3 WG5. L1R W/R O 7u-14 TO NRC DIRECTOR OF REGULATORY OPERATIONS.

l R tG l ute V.

OC1. 14 197o. DOCKET $0-312. TYPE--PwR, MFG--BGw.

A E -- StC MI CL NRC PubLIC DOCUMENT ROOM. 1717 H STREET, AV it A V A I L Ab l L l'i Y MIN! MUM CHARGE aASHINGTON.

L.

C.

20b45 (08 CENIS/PAGE

%.Ou)

UIRTY Oil IN GOVENOk.

DURING AN ATTEMPT TO MANUALLY

, A u, b l R A C I L AUSC SI' R1 D!tbEL G'.N E R A TOk o WHILC THE REACTOR #AS bHUT DOwll. THE JtESCL FAILED TO LTAkl.

Sub5EQUc N T STAR 1 ATTEMPTS RESULTED IN t

I ALUUT /. bOL FAILURE RATh.

AFTER C HE CK I NG THE SYSTEM AND l

1dOLA1INv The PR OH L E M TO THE GOVERN (1R.

Ii WAS DE1CRMINED THAT F LU:3HING OUT THE OIL AND RtFILLINb WAS THE SGLUT!GN.

O!RTY OIL AND DuPUhllb C AUSED THE FAILURES.

1 HEN. 17 S U C CE S S '- U L STARTS WLQL MAUL.

EM/b/OctObul-00OOuIJ//

12

,ALCibb!GN NU.

J OZ O l l 's 69 b TITLL UltSEL OCNth ATOR FAIL 5 TO START t.1 RANCHO SECO i CORPAUTH b ACR AltEN1 D MUNICAPAL UllLITY DISlRIC1. SACHAMENTO. CA U Ali 1970 TYPt U

FLvu 3 kwS. L1R m /N O 76-1G TO NRC DIRECTC'R OF REGULATORY OPERATIONS.

REGION V.

AUu. 30.

1970. DOCKL1 $ 0 -312. T Y P C --+2 W R. MFG--OGw.

l A L--ML C n's EL AVAIL AVAILALIL11Y - NkC PubLIC DOCUMcNT ROOM. 1717 H STREET.

C.

20S4b (US CtNTL/PAGE - MI NIMUM CH ARG E -. -.

W SH I N G 10t..

w.

LP.uu)

AbGlhACI C AUSE - PINluN T f; L T H STRUCK RING GEAR TEETH.

WHILE THC UN11 aAb Shul DGwN. A START FAILbhE OF DIESEL GENERAlOK A WAS l

ixPtR l t.NCt b udRING A SPcCIAL TEST OF THE AIR START SYSTEM CAPACITY.

T HE DC A1R STAR 1 bYSTEM eAS ISOLATED TO TEST THE AC LYb1EM C APAC IT Y.

THE TEET H ON THE PINION STPUCA THE TECTH ON 1 HE RING SEAh ANO wOULD NOT ENGAGc, PREVEN 11NG UPERATIOP3 OF THE AIR 51Ahl NOTORS.

WORK IS IN PROGRESS TO ELIMINATE THlb PRUHLEN.

66 /b / 0 0 00 0 01 -00 0 0013 / /

13 AC C L b L 1 ON NO.

0 0Z 01 1650 b iIllLt DILSCL C r.N E R A T OR FAILS TO START AT RANCHO SECO lCORPAU1H S Alk AME NTO MUNICIPAL UTIL11Y DISTRICT. SACRAMENTO. CA iDAlt 1970 TYot O

, met 90 3 PGS. L1h m /R U 67-9 TO NRC DIRECTOR OF REGULATORY OPER AT IONS.

ALGION V.

ALL.

13.

1970. DOCAET 50-312. TYPc

'WR.

MFG--OCw.

A t.--d E C H 1 E L AVAIL AVAILAblL11Y - NRC PUbLIC DOCUMENT ROOM. 1717 H STRCCT.

.ASHINGTON.

D.

L.

EOb46 (0S CENTS /PAGE -- MINIMUM CHARGE 31.001 AubTWAC1 CAubd - uw tuM N.

uuRING SURVE ILL ANCE TESTING OF DIESEL

i

,,.e 5b / b / 0 0 000 01 -0 0 0 6013 / /

13' LONTINUATION 1

P /.G E 459 btNcRATb% e ' wH IL E T Ft - UN I T =AS IN COLD ShuTUOwN FOR MAIN bdNERAILb RLvAth5, biVLHAL START FAILURES wCRL EAPCRIENCED.

NCI DLFINiil C AU 54 FUw FAILUHES COULu 6E FOUND.

ATTLMPTS its DLPLILAIL'THE PAILuhE Ar D I SOL A TE THE CAUSE mLRE UN duCL1-SS FUL.

'AFThe 13 LUCCdSSFUL' STARTS, THE b!EdcL GENERATUm MAL DECLARED I

IN StkVICt.

I.

l t

I l

i

,~..

/

d g, E"Clo(sl 3

60

- (')SMUD

' ' SACRAMENTO MUNICIPAL UTILLTY DISTRICT C). 6201 S Street. Box 15830. Sacramento, Califomia;'95813; (916) 432 3211,.,,

, i.

.-~....,.;,

.s....

. u. -

~...,a.s

.. v.s.

.~

s..

..,c.b

.s..

u

..a

c...

o

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E

.,1 20, 1978-

-.U January

~

~

14

... ~,,.,

x 4

a..i -

.~. e. 5 3

3(

5..

...,s.s

- L..

i.

. km:.D gl -

K....; : Q d.

T,:

?

.. - - ~..-

p

.y

~

^

D,

' " Director-of Nuclear Reactor ~'Regula' tion

~.

.e.f',...,,, ~ ff.?.,.

L !'

AT'IN:. Karl R. Goller

/,'.7

~ /c Assistant Director for Operating Reactors

} ' ;d Division of Operating Reactors

,j

.,,'g,.ttp[pM, r

'- 4 U.S. Nuclear Regulatory Com:sission

, -,f

-i Washington, D.C.

20555

.s......

..~,r Re: Docket 50-312

'':,. 7.

Rancho Seco Nuclea-Generating Statiorr,

. ~.,. '. f.r *

.,,;.,;...v,4 Unit One Gentlemen:

The Sacramento Municipal Utility District received from you on December 28, 1977, a twenty-two page questionnaire concerning Diesel Generator Units.. Please find attached our reply per your request and.

additionar informatian including our inspection procedures.

' ' ],' Q

4....,-.,<.v. w....,.m -.g.w.,,

n.., - 4

-.~,--. k.

. e --.. ~~ - -.n.- < ~ ~u.w-r.3-ws. -

We consider this reply closes out your request. The data not included in the questionnaire is either not readily available or would require unorthodox testi: g of the units to obtain the information requested.

If you have any questions concerning information contained in this reply please cortset Mr. R. Colombo at the Rancho Seco Nuclear Station.

Respectfully submitted, 6

gln

• A A

J. J. Mattimoe Assistant General Managed and Chief Engineer JJM:RWC: sal

'f~

At tachments-e-

sd g

.i 4

j gi

.. * *.. a..

f ['

id ~

n I

v',y;di-

-l/(k

.:'f(;Q;;

i 1'.

9-p.

3 G,

n&

. -.;3.'.

+:

T/

780270031 w-f O % h

• g a.. c.s 4 :4.

.s

• ' ' ' :}.

?.

p _ j. _,

5 f

i l

S.

Are any foreien cases such as propane, freon, halon, carbon dioxide, etc. stored in the:

Diesel Engine room?

Yes No X

or adjacent buildings? Yes ;g_,No If yes, (other than hand portable fire extinguishers), then identify gases and give approximate tank size.

4 I

4

~;

" '- ~ '

Gases co2 1525 lbs.

l I

l l

T.

Does control system automatic =11y bypass, in emergency starting, any engine temporar1 y out of service for maintenance? Yes No X

If yes, then how many f ailures to bypass have occured?

,1 w ri

.l U.

Does the control system automatically override the test mcde under emergency conditions? Yes x

No Y.

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

1 Yes X No l

e i

If yes, then which part or subsystem?

Fuel Injectors 1

~4

}

How many failures?

1 l

Give nature of failure.

Sticking Iniectors 1

l l

W.

Would periodic (yearly or other) evaluation and/or testing

}

by "outside experts" contribute significantly to the diesel-ger.erator reliability? Yes X

'No i

Give brief reasons for the answer. Manufacturer i

should check units on refueling outages acrmally and anytime their expertise is need.ed.

I i

e 4

e T

O

.g,,._____.._..--

j X.

1.

Give the accumulated time-load operating record for each diesel-generator unit from installation tu the present (Running Hours): A - 499.8 Hours B - 494.9 Hours

. Preoperational test Date 5-5-70 Engine.

Sury. Testing &

Emergency Total i.

l

Serial No. :

Maintenance Mrs. :

and Other Hours No Load : Loaded Service Mrs. :

4 '

A 38DQ68030TDSM12 :

UN UN UN 499.8 i

)

B 38D868025TDSM3 2 :

UN UN UN 494.9 j

j l

2 l

1

^.

l i

100*:

2.

Surveillance test icad (percent of continuous rating)

I l

3.

Give the projected or planned time-load operation for i

j each diesel-generator unit during the next 12 months.

i l

Surveillance 5 Emergency Total

Maintenance Hrs. :

and other :

Hours

, Service Hrs. :

4 70 0

yo Provide the following summary of the periccic surveillance testing 7

4.

experience:

Starting date of surveillance testing (OL date) 9-1-7) t a.

b.

Periodic test interval Bi-Weekiv-Refueling Total number of surveillance tests performed 202 c.

3 d.

Total number of test failures 6

failure to start i

failure to accept load None failure to carry loaa 5

failures due to coerator error _%,,.

~

failure due to equipment not being operative during emergency J

condi tions None

\\

e.. Supply a copy of the surveillance test procedures with this i

comDieted questionnaire.

PT-23.1 PT-23.2 - Attached PT-23.3 t.-