05000255/LER-2076-028, License Event Report 1976-028-00 Re Rod Sequencer Operation

License Event Report 1976-028-00 Re Rod Sequencer Operation

ML18348A280
Person / Time
Site:	Palisades
Issue date:	09/09/1976
From:	Bixel D Consumers Power Co
To:	James Keppler NRC/RGN-III
References
LER 1976-028-00
Download: ML18348A280 (4)

LER-2076-028, License Event Report 1976-028-00 Re Rod Sequencer Operation

Event date:
Report date:
2552076028R00 - NRC Website

text

t consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 September 9, 1976 Mr James G Keppler Office of Inspection & Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255, LICENSE DPR PALISADES PLANT - ER-76-28 ROD SEQUENCER OPERATION Attached is a reportable event related to the Palisades Plant.

David A*Bixel Assistant Nuclear Licensing Administrator SEP 13 i976

'l

- ICENSEE EVENT CONTROL BLOCK:._I ---1._..___.___.__--J.__.I [PLEASE PRINT ALL REGUIRED INFORMATKllll]

1 6

LICENSEE NAME

@El I Ml rl PIAI LI ii 7

B 9 14 LICENSE NUMBER 10101-10101010101-10101 15 25 LICENSE TYPE 14111111111 26 30 EVENT TYPE Io 11 1 31 32 REPORT TYPE.

REPORT SOURCE OOCKl;T NUMBER EVENT OATE REPORT OATE

@ill CONT I.__.____, w L!J 1015101-101215151 1018121617161 IOl9IOl917161 7

B 57 5B 59 60 61 BB 69 74 75 BO

EVENT DESCRIPTION

I 80 I

10'21 I This event. qccnrred qn 7

8 9 8-23-76 but was not classified as a reportable event until At about 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> with all rods withdrawn, an operator attempted to lolsl I 8-26-76.

7 8 9 lol41 I insert Group 4 rods using the 1;manual sequential mode."

80 It was observed that Group I 80 7

8 9 This overlap is not designed to occur until Group 4 has been in-lol5113 also moved.

7 8 9 lol61 I serted to 51" above the bottom of the core.

The system was (see Line I

18) (ER-76-28) 8l 7

8 9 SYSTEM

CAUSE

COOE COOE COMPONENT CODE

@E]IRIBI lLJ lrlNlslTIRIDI 7

B 9 10 11 12 17 CAUSE DESCRIPTION PRIME COMPONENT SUPPLIER w

43 COMPONENT MANUFACTURER IF111.2101 44 47 80 VIOLATION L!J 48 lol0I I Preliminary investigation at the time of occurrence did not disclose the source of 7

B 9 lolsl lthe problem.

The following morning the system was found to operate normally in

. 7 8 9 l1lol !modes and the previous evening's problem could not be duplicated.(see attached 8 9 FACILITY METHOD OF STATUS

% POWER OTHER *STATUS DISCOVERY EID w I 0 I 0 I l I 11..--__

N_A __

__.I

~

7 8

9 10 12 13 44 45 CONTENT FORM OF ACTIVITY RELEASED rn w 7

8 9

OF RELEASE AMOUNT OF ACTIVITY W

~' _______

N_A __ -'---~

10 11 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

~lololol W 7

8 9 11 12 13 PERS'ONNEL INJURIES NUMBER

DESCRIPTION

45 NA EE] I o I o I ol NA DISCOVERY DESCRIPTION NA 46 LOCATION OF RELEASE NA 80 a11 I 80 sheet}

I 80 80 80 80 7

8 9 11 12 80 PROBABLE CONSEQUENCES

~

I None.

Power level and rod motion was too small to cause undesirable effects.

7 8 9

. 80 LOSS OR DAMAGE TO FACILITY TYPE

DESCRIPTION

~~

NA 7

8 9 10 80 PUBLICITY EIZl None.

7 8 9 ADDITIONAL FACTORS E@ I operated satisfactorily in the "manual group" mode during this period of time.

7 8 9 ITlfil 7

8 9 80 I

80 80

LER 76-28 Palisades (Continued From Line 10)

The system has continued to operate properly until the present time and consequently we are unable to determine the cause of the problem.

We plan to exercise the asso-ciated relay from the computer terminal during the next scheduled outage in an attempt to duplicate this problem.

If this attempt fails and no hardware dis-crepancies are found, the computer program will be reviewed for any oversight which may have permitted the problem to occur.

~-nt P*.,.

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©8/27/76 1549 8/27/76 i97b UUGcJ8 THIS TLX CONF'IftMS TELEPHONE NOTIF'ICATYON OF K BAKER~ NRC INSPECTO!'it~

AT r~945 AUGUST 26.1>

1976 OF POSSIBLE PRO BY G B SLADEP ACTING PLANT SUPER HJTEMDENT o

. (

IMPROPER C~ SEQUENCER OPERATION AT APPROXIMATELY 15©@ AUGUST 23 0 1976 WITH ALL RODS WIT~DRAWN GROUP 4 SELECT LIGHT ENERGIZED WHEN GHOUP 3 WAS Sf:LECTEDo RODS.WERE NOT MOVED SEQUENTIALLY IN THIS CONDITION..

• DETAILS WILL RE PROVIDED IN SUBSEQUENT REPORTo J G LEWIS/F G.BUTLER PALISADES PLANT CONSUMERS POWER COMPANY

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\\f.IU ASCY. 111 HEA AUG 3 0 1976