ML18283B486

Abnormal Occurrence Report BFRO-50-296/761W Re Blade Guide Assembly Removed from Reactor as Part of Fuel-Loading Operations

ML18283B486
Person / Time
Site:	Browns Ferry
Issue date:	07/16/1976
From:	Fox H Tennessee Valley Authority
To:	Moseley N NRC/IE, NRC/RGN-II
References
BFRO-50-296/761W
Download: ML18283B486 (7)

Text

NRC FoRM 195 U.S. NUCLEAR REGULATORY C ISSION DOCKET NUMBER I 2. 76 I 50-296 FILE NUMBER NRC DISTRIBUTION FOR ipse,RT 50 DOCKET MATERIAL INCIDENT REPORT TO: FROM: DATE OF DOCUMENT Mr, Norman C, Moseley Tennessee VaIley Authority 7/16/76

.Chattanooga, Tennessee DATE RECEIVED H S Fox 7/20/76 ETTER 0NOTOR IZED PROP INPUT FORM NUMBER OF COPIES RECEIVED OORIGINAL (/UNCLASSIFIED one signgd copy op/

DESCRIPTION ENCLOSURE I

Ltr. trans the following: Licensee Event RePort (RQ 50-296/761@) 'on 7/4/76 concerning the'.blade 'guide ass'embly handle which was broken during fuel loading operations, ACRO ~-

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- '" 'PLANT NAME: NOTE: lF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J..COLLINS Browns Ferry Unit 3 FOR ACTION/INFORIiIIATION 7 2176 RJL BRANCH CHIEF: S tolz U CYS FiOR ACTION LIC..'ASST.: H lton W /CYS ACRS CYS HOLDING S INTERNAL D IST Rl BUTION I%E 2 MIPC SCHROEDER IPPOLITO HOUSTON NOVAK CHECK GRIMES CASE TEDESCO MACCARY EISENHUT SHAO VOLLEYER EJNCH KREGER J. COLLINS EXTERNAL DISTRIBUTION 0 TROL NUMBER LPDR:Athens Ala.

TIC:

7go NRC FORM 196 I2.76)

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NNESSEE VALLEY AUTH TY CHATTANOOGA. TENNESSEE 3740$

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JUL 16 1976 *

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Mr. Norman C. Moseley,'irector U.S. Nuclear Rezm3.atory Com&ssion oi" Office of Inspection and ~orcement e~oo+y% ice+

Re+on II 230 Peachtree Street, kid., 8th FLoor ~

Atlanta, Gcor~a .30303 ~

Dear Mr. Moseley:

'~Regulator.:Do'cl et File TKtNESSEE VAIZEY AUT1iORITY 3H(XQ'fS FERRY NUCLEAR PLViT Ui'lIT 3-DOCIKT HO.50-29o - FACILITY OPZiWZXhYi LECEiiTSE DPRAG REPORTABLE OCCURREhCE REPORT BZRO 50-296/761M The enclosed rePort is to orovide details concerning a olade guide assembly that >~as bein removed fxom the reactor as varC ox fuel-loading one ations and is sub-~tted in accordance ~lith Aoyerdix E to Remxlatory Guide 1.'6, Revision 4, Atilt 1975. Kris event occurxed on Brans Ferry Nuclear Plant unit 3.

=Very truly you s, TJMMSEE VAIZZYAUTHORITY 8'

H. S. lox Dixector of Po~ler Production Enclosure (3)

CC (Enclosure):

Director (3)

Office of Management Information and Control, P"'rogram U.S. 1'nuclear Rectory Colrmission Mashington, D.C. 20555 Director (40)

Office of InsPection and. xforcement U.S. Nuclear Regulatory Comad.ssion Haalu.ngton, D.C. 20555 8308 An Equal Opportunity Employer

~*

ICENSEE EVENT REPORT CONTROL BLOCK: t'PLEASE PAINT ALL REQUIRED IIIIFORIVIATION)

~ t 1 UCENSEE UCENSE EVENT NAME LCENSE NUMBER TYPE TYPE

[OD1] A L B R 'iF 3 0 0 0 0 0 0 0 0 0 4 1 1 1 1 L0oc1iI 7 89 14 15 25 26 30 31 32 REPORT SOURCE'OCKET

~+ NUMBER REPORT OA'TE REPORT'ATEGORY TYPE EVENT DATE IOD1] CON'7 2 L 0 5 0 0 2 9 6 0 7 0 4 7 6 ~07 1 2~76 7 8 57 58 59 60 61 68 69 74 75 80 I

EVENT OESCRIPTION

[OD~] See attached sheet) 7 8 9 80 7 89 80 toO~]

7 89 80

~os 7 89 80 QOQ 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT COMPONENT SUPPLER CODE IIX CODE x "

COMPONENT CODE x x x x MANUFACTURER 7

LLEEEE~O 8 9 10 CAUSE OESCRIPTION 11 I 12 17 N

43 44,5 3 9 2 47 . 48 Qg See attached sheet) 7 89 80

[OO~)

7 89 80

~10 7 89 METHOD OF 80 FACIUTY STATUS POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION

@~g ~c ~oo o N/A 7 8 9 10 12 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

@~2 ~Z Z 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Pg [oaooJ 2 N/A 7 89 11 12 13 80 PERS'ONNEL INJURIES NUMBER 'ESCRIPTION

[A<4] ~oo o N/A 7 89 11 12 80 OFFSITE CONSEQUENCES Q~g N/A 7 89 80 LOSS OR DAMAGE TO FACILITY

,TYPE DESCRIPTION

~16 D Blade uide handle sheared and stD ins bent 7 8 9i 10 80 PUBLICITY N/A 7 89 80 AOOITIONAL FACTORS N/A 7 89 80 7 89 NAME: PHONE'0 GPG GGT 007

Event Descri tion A blade guide assembly was being removed from the reactor as part of fuel-loading operations. When the bottom of the blade guide assembly was approximately three feet above the upper core plate, a section of the telescoping grapple boom slipped downward. When this section reached its normal extended position, it impulsed the lower sections which caused an abrupt force on the boom which broke the blade guide assembly handle. The blade guide assembly fell back into the incore position from

,which it was removed. (BFRO-50-296/761)

Cause Descri tion Interference ~between two adjacent sections of the boom as the grapple was being Jj lifted ic used one section to stop before it was fully extended. Then the section fell to its fully-extended position.

Additional Factors All pieces of the boom and blade guide assembly were accounted for; the surrounding fuel assemblies, adjacent LPRM incore, and the fuel support piece inspected and no evidence of damage observed; and the boom was replaced with the unit 2 boom which had demonstrated reliability during fuel loading on that unit.

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