ML18227A427

Submit Licensee Event Report of Turkey Point Unit 4, in Accordance with Technical Specification 6.9.2 to Provide 30-day Notification, Occurrence on 7/26/1976 for Malfunction of 4B Starting Transformer Breaker

ML18227A427
Person / Time
Site:	Turkey Point
Issue date:	08/25/1976
From:	Schmidt A Florida Power & Light Co
To:	Moseley N Office of Nuclear Reactor Regulation
References
PRN-LI-76-228
Download: ML18227A427 (19)

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M'<~<>> 3 FLORIOA POWER 5 uGHT CO..IPANV August 25, 1976 QA%S >~IAIAI~~I PRN-LZ-76-228 A4r. Norman C. Hoseley, Director, Region Office of Inspection and. Enforcement.

II U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. N., Suite 818 Atlanta, Georgia 30303

Dear Nr. Noseley:

REPORTABLE OCCURRENCE 251-76-6 TURKEY POINT UNIT 4 DATE OF OCCURRENCE JULY 26F 1976

'HALFUNCTION OF 4B STARTTNG TRANSFORMER BREAKER Cfg0P The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9.2 to provide 30 day notification of tne subject occurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources RSA/cpc Attachment cc: Jack R. Newman, Esquire Director, Office of Inspection and Enforcement (40)

Director, Office of management Information and Program Control (3)

IR LLPING BUILD FLORIDA

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LICENSEE EVENT REPORT COW'ROL BLOCK: fPL&lSE PRINT ALL RECUIRED INFOR HAT'ON)

Ir~ENScE LIENEE EVENT NAhIE r UCENSE NUMGEA TYPE TYPE

[oO~] F L T P S 4 0 0 0 0 0 0 0 0 0 41 1 1 1 1 ~0 3 7 89 14 15 25 26 30 31 32 025(10(7266082476 REPORT REPORT

,7 IoogcoN~L~L050 8 '7 CATEGORY 58.

TYPF 59 SQUACF.

60 61 OOCIIET NUhIBEA 68 69

~ EVENT OATS 74 '5 AEPOAT OATh 80 EVENT OESCFl(PTION

[062] Durin normal stead state o eration, the No. 4 Generator was tripped by 89 80

~03 enerator lockout action. The startup transformer breaker (4B 4160 7 89 80

~ +04 Volt Bus No. 49726456 failed to close durin the automatic transfer 7 8 9 eo

[0D~] se uence from the auxiliar transformer. This left the 4B 4160 Volt Bus 7 8 9 eo Qo g deenergized. Xns ection of the breaker showed that the HH switch was not 7 8 9 PAhr. 80 SYSTEM CAUSE E'ChIPCNO4T CC MPCN LrIT CQOE COOS COMPONENT COOS SUPP( 'EA MANL'FA~rArEA VOMTCN

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89'0 LEFT E C K T B R K N N 1 2 I 0 7 11 12 17 43 44 47 48 CAUSE OESCRIPTION gg8 7 9 nsa c .'on of the brea r showed that the HH switch was not makin 60 va 7 82 80 Qg lowered then raised to establish contact. The followu investi ation 7 89 FACUTY METI4QO QF r 60 STATUS PGVI CA OTHER STATUS OISCOVEAY OISCOVEAY OESCAIPTICN 7

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'IO I o 12 13 N A 45 46 N/A FOAM OF 60 ACTIVITY CQ((EXTENT RcLEASEO QF RELEASE AhIOUNT OF ACTIVITY LOCATICN OF AELEASE t112 -

z ~z N/A N/A 7 8 9 10 11 60 PERSONI'IEL EXPOSURES NUMGFA TYPE OESCAiPTIQN Q~g ~oio o z N A 7 89 11 12 13 BO PERSONNEL INJURIES NUhIGEA QESCR(PT(ON

~<< ~00 o N/A 7 89 11 12 PRPQABLE CONSEGUENCES t115l 7 8 9 LOSS OR DAMAGE TO FACIUTY TYPE QESCRSFTIQN

~1S Z 7 89 10 PUBLICITY

~1m I 7 89 ~ 80 AOOITIONAI. FACTORS sation of Fvent Descri tion and Cause Descri tion.

~ 7 SS Q~~j 7 89 60 R. S. Abraham PHONE.3 05/552-3 779 r CFO 05I 66T

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Reportable Occurrence 251-76-6 Licensee Event Report Pa e Two Event Description (continued) making full contact which prevented the breaker from closing.

Previous occurrences involving this type breaker have been described in Reports 3-72-3, 3-72-4, 250-74-2, 250-75-4,

~i 250-75-5, 250-75-6', 251-75-8 and 250-76-2. (251-76-6)

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~ 4 Cause Descri tion (continued) being conducted by the Off-Site Support Staff as mentioned in Report 250-72-2 will include the operation of this switch.

P.O. BOX 013100, MIAMI, FLORIDA 3310I FLORIDA POWER 8I LIGHT COMPANY August 25, 1976 PRN-LI-76-228 Mr. Norman C. Moseley, Director, Region II Office of Inspection and Enforcement 7%

U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 818 gy~4~y Atlanta, Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 251-76-6 TURKEY POINT UNIT 4 DATE OF OCCURRENCE: JULY 26, 1976 MALFUNCTION OF 4B

'STARTING TRANSFORMER BREAKER 14 The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9.2 to provide 30 day notification of the subject'ccurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources RSA/cpc Attachment cc: Jack R. Newman, Esquire Director, Office of Inspection and Enforcement (40)

Director, Office of Management Information and Program Control (3)

$ Vl7 HELPING BUILD FLORIDA

LICENSEE EVENT REPOR I

CONTROL BLOCK: PI.EASE PRINT ALL REQUIRED INFORIVIATIDIM) 1 6 UCENSEE UCENSE EVENT FLTFB40 NAME 0 0 LICENSE NUMBER 0 0 0 0 0 0 41 11 TYPE 1 ~03 TYPE

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.7 89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE OOCKET NUMBER ~ EVENT. OATE REPORT OATE

~01 CON'7 L L 0 5 0 0 2 5 1 0 7 2 6 6 0 8 2 4 7 6 7 8 57 58 =

59 60 61 68 69 74 75 80 EVENT DESCRIPTION

@02 Durin normal stead state o eration, the No. 4 Generator was tripped by 7 8 9 80

[0D3} enerator lockout action. The startup transformer breaker (4B 4160 7 89 80

[0D4] Volt'I Bus No. 4W26456 failed to close durin the automatic transfer 7 8 9 80

[ODg se uence from the auxiliar transformer. This left the 4B 4160 Volt Bus 7 8 9 80 Qo 6 deener ized. Ins ection of the breaker showed..that~-the'H switch was not 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE COOS COMPONENT CODE SUPPUER MANUFACTURER VIOLATION

'07~ZBECKTBRK

+N W 1 2 0 N 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION Q~S 7 8 9 s c ion o he break r showed that the HH switch was not makin 80 s

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,Q~ 0 lowered then raised to establish contact. The followu investi ation 7 89 FACILITY METHOO OF 80 STATUS .e powER OTHER STATUS OISCOVERY OSCOVERY OESCRIPTCN E ~iO O N A N/A 7 8 9 10 14 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 2 Z Z N/A N/A 7 8 9 10 11 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION 7

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~z 12 13 N A 80 PERSONNEL INJURIES NUMBER OESCRIPTION

+4 ~00 0 N/A 7 89 11 12 80 PRO/~LE CONSEQUENCES

'~g 7 8 9 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION z

7 89 10 PUBLICITY 7 89 ~ 80 ADDITIONAI. FACTORS 7 89 ti o .vent Descri tion and Cause Descri tion.

80 7 89 80 NAME. R. S. Abraham PHONE.3 05 552-3 7 7 9 eFo eel ~ eeT

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Reportable Occurrence 251-76-6 Licensee Event Report Page Two Event Description (continued) making full contact which prevented the breaker from closing.

Previous occurrences involving this type breaker have been described in Reports 3-72-3, 3-72-4, 250-74-2, 250-75-4, 250-75-5, 250-75-6, 251-75-8 and 250-76-2. (251-76-6)

Cause Description (continued) being conducted by the Off-Site Support Staff as mentioned in Report 250-72-2 will include the operation of this switch.

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FLORIDA POWER 5 LIGHT COMPANY 8 >a>e - Ilgm September 23, 1976 QQltyWJQgy PRN-LI-76-243 Mr. Norman C. Moseley, Director, Region II Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 818 Atlanta, Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 250-76-6 TURKEY POINT UNIT 3 DATE OF OCCURRENCE: SEPTEMBER 9, 1976 DIESEL GENERATOR CIRCUIT BREAKER "3A" The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9.2 to provide prompt notification of the subject occurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS/cpc Attachment cc: Jack R. Newman, Esquire Director, Office of Inspection and Enforcement. (30)

Director, Office of Management Information and Program Control (3)

HELPING BUILD FLORIDA

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LICENSEE EVENT REPORT

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~ CONTROL BLOCK: fr LEASE PRINT ALL REaIjIRED INFORMATION)

UCENSEE UCENSE EVENT F L NAME T P S 3 0 0 LCENSE NUMBER 0 0 0 0 0 0 0 41111~01 TYPE TYPE

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7 89 14 15 26 30 31 32 CATEGORY REPORT TYPE REPORT SOURCE OOCKET NUMBER - EVENT OATS REPORT OATE

~01 CON'7 T ~L 0 5 0 0 2 5 0 0 9 0 9 7 6 0 -9 2 3 7 6 a 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION

[OD2J aa At a roximatel 5:20 P.M. durin normal stead state o eration, it was 80

[QD3] found that the closin s rin s in the "3A" Diesel Generator circuit 7 89 80

+04 breaker were not in the corn ressed or "char ed" osition indicatin 7 8 9 80 Qg that the breaker would not be able to res ond to a closin si nal.

7 8 9 80 l006 Redundanc was rovided durin this occurrence 'b the "3B" Diesel 7 8 9 PFZME 80 SYSTEM CAUSE CC MPO NENT COMPONENT COOE COOE COMPONENT COOE SUPPER MANUFACTURER

+E C K T B R K G 0 8 0 N 7 8 9 10 11 12 17 47 48 CAUSE DESCRIPTION 7

Qg8 9 T c o 's o rr n was a worn n ion bushin between the closin 80 Qg8 s rin drive motor eccentric and the linka e to the ratchet wheel that 7 9 80

,Q~ 0 corn resses the closin s rin s. This reduced the stroke of the linka e 7 89 FACVTY METHOO OF 80

/~77 7 8 STATUS

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% POWER 12 13 OTHER STATUS N A 44 OISCOVERY b

45 46 OISCOVERY OESCRIPTION N A FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE z ~z N A N A 7 9 9 10 11 44 45 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION

~9~99 7 89 O

11 Z

12 13 N A ao PERSONNEL INJURIES NUMBER OESCRIPTION

~4~oo o. N/A 7 8 9 . 11 12 80 PRPP~LE CONSEQUENCES Q~g N A 7 8 9 80 LOSS OR DAMAGE TO FACIUTY TYPE OESCRIPTION z N A 7 89 10 80 PUBLICITY N A 7 89 80 ADDITIONAL FACTORS io Descri ion.

7 89 80 7 89 80 NAME: M- A. Scho man ,

PHONEP 5/552-3779 G90 dd'Ii ddl

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Reportable Occurrence 250-76-6 Licensee Event, Report Page Two Event Descri tion (continued)

Generator breaker. The subject breaker was removed from its cubicle (3AA20) and a spare breaker was installed in its place.

This was the first occurrence during which the unavailability of a safety-related circuit breaker was caused by the particular mechanical defect described in detail in the Cause Description.

(250-76-6)

Cause Description (continued) and resulted in the drive pawl not being able to advance the ratchet wheel. The drive motor, therefore, was not compressing the closing springs and continued to run until overheating caused a motor brush to fail. The worn bushing was replaced, and the motor was repaired. The circuit breaker (Type AM-4, 16-350-1H) was then satisfactorily tested. Malfunctions of this type breaker are currently under investigation by the off-site support staff and status reports will be issued periodically to describe the results of the investigation.

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