ML20084U273

LER BFRO-50-260/7617:on 761116,HPCI Turbine Steam Supply Valve 2-FCV-73-16 Failed to Open & Breaker Overloads Found Tripped.Caused by Sheared Switch Gear Assembly Pin for Limitorque SMB-2 Valve Operator

ML20084U273
Person / Time
Site:	Browns Ferry
Issue date:	12/15/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-260-761, NUDOCS 8306280411
Download: ML20084U273 (2)

Text

,

()

LICENSEE EVENT REPO$

CONTROL BLOCX:l l

ll l

l l

[PLEASE PRINT ALL CEIUIRE]INFLIM ATl!N}

1 -

6 YPE TV LCENSE NUMBEA

[@ 9l A lLlBl Rl Fl 2l l 0l 0l-l0 l 0 l 0 l 0 l 0l-l 0l 0l } 4l 1l 1l 1l il lO!3l NAME 25 26 30 31 32 14 15 7 8 REPoAT DATE

"'7pE $EA$

DOCKET NUMBER

- EVENT DATE 01 CON'Tl l

l lL l ' W l 0l 5l 0l-l 0l 2l 6l cl l1l1l 1l 6l 7l 6]

l l

l l

l l

l cATEcoRY T

68 69 74 75 80 7 8 57 58 59 60 61 i

EVENT DESCRIPTION l

Q l During performance of operability surveillance instruction, the HPCI turbine steam 80 89 W e breaker overloads were found tripped.

l 7gg ] supply valve 2-FCV-73-16 failed to open.

60 89 All other safeguard systems were l

7BE I ne overloads were reset and the valve opened.

80 l

7 89 32 l operable (BFRO-50-260/7617) 60 I

7 89 80

@l pseue 7 89 CODE COMPONENT CODE M

AC WXATON SE lClJl d l Vl A lL lV l 0l Pl l Ll 2l 0l 0l lN l 7 89 to 11 12 17 43 44 47 48 Q l %e torque switch gear assembly-pin for a limitorque size SMB-2 valve ope CAUSE DESCRIPTION 60 7 89 l

@ l preventing the torque switch from stopping the motor when the valve closed causine the 80 1

l motor overloads to trio.

%e ein was renlaced nd tha sen t iro operated satisfactorily.

7 89 OfSCOVEOf DESCAPTON STAIUS

% POWER OTHER STAT'JS OtSCOVERY l

QQ W

l 0l 5l 0l l NA l d l

NA 80 7 8 9

10 12 13 44 45 46 LOCATON OF RELEASE l

AELE SEO OF AMOUNT OF ACTMTV n

ULJ LajASEl NA l

l NA 80 44 45 r7 8 9

10 11 PEASONNEL EXPOSURES NUMBER TYPE DESCAiPTON l

810 l 010l

[aj l

NA

_.80 7 89 11 12 13 PERSONNEL INJURIES NUMBtA DESCRIPTCN l

H 1010101 I

a 60 7 89 11 12 l

OFFSITE CONSEQUENCES NA DE l 80 7 89 LOSS OR OAMACE TO FACILITY l

TYPE DESCRIPTCN n

02 W l

80 8306200411 761215 7 89 10 PDR ADOCK 0500026]

~

l PUBLICITY NA S

DE I 50 l

7 89 ADDITIONAL FACTORS l

QG lWis Ls a randon failure ah'd these is no reason to expect additional failures of this 60 7 89 g

Q l type.

.00 7 89 m

@4otuiso,A Q

o g/m e

TENNESSEE VALLEY THORITY e

E

-g CHATTANOOGA TENNESSCE 374ot

+-

Wo.n16 IE FILE COPY December 15, 1976

?

~

Mr. Norman C. Ifoseley, Director

~

U.S. Nuclear ReEulatory Comminaion Office of Inspection and Enforcement l

Region II 230 Peachtree Street, NW., 8th Floor Atlanta, Coorgia 30303

Dear Mr. Moseley:

TENNESSEE VALLEY AUTl!ORITY - BROWNS FERRY NUCLEAR PLANT UNIT 2 -

DOCKET No. 50-260 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-260/7617 The enclosed report is to provide details concerning the !!PCI turbine steam supply valve 2-FCV-73-16 that failed to open during perfornance of an operability survoillance instruction. This report is submitted in accordance with Browns Ferry Technical Specifications section 6.

This event occurred on Browns Ferry Nuclear Plant unit 2.

Very truly yours,

\\

TENNESSEE VALLEY AUTIIORITY b(f O'

% & '(*.,'.

'&>80 :

(p k'

6' f'.*, i[NS0[,'

H. S. Fox Director of Power Production m

Enclosure (3)

CC (Enclosuro):

Director (3) l Office of }tanagodont Information and Program Control U.S. Nuclear Reg $1 story Commission l

Washington, D.C.

20555 Director (40) y Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555

\\

r An Equal Opportunity Employer 12&;is

..