05000255/LER-1980-031-01, /01T-0:on 800826,group 1 Control Rods Withdrew 121 Inches Which Resulted in Unplanned Reactivity Insertion. Caused by Loss of Both Primary & Secondary Data Loggers. Loggers Restored & Control Rods Reinserted

/01T-0:on 800826,group 1 Control Rods Withdrew 121 Inches Which Resulted in Unplanned Reactivity Insertion. Caused by Loss of Both Primary & Secondary Data Loggers. Loggers Restored & Control Rods Reinserted

ML18045A642
Person / Time
Site:	Palisades
Issue date:	09/23/1980
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML18045A641	List: 05000255/LER-1980-031-01, /01T-0:on 800826,group 1 Control Rods Withdrew 121 Inches Which Resulted in Unplanned Reactivity Insertion. Caused by Loss of Both Primary & Secondary Data Loggers. Loggers Restored & Control Rods Reinserted 05000255/LER-1980-032-03, /03L-0:on 800826,primary Data Logger Ceased Performing Control Rod Scans & Secondary Data Logger Typer Became Stuck.Cause Unknown.Failure Corrected by Resetting ML18045A640
References
LER-80-031-01T, LER-80-31-1T, NUDOCS 8009260492
Download: ML18045A642 (1)

LER-1980-031, /01T-0:on 800826,group 1 Control Rods Withdrew 121 Inches Which Resulted in Unplanned Reactivity Insertion. Caused by Loss of Both Primary & Secondary Data Loggers. Loggers Restored & Control Rods Reinserted

Event date:
Report date:
2551980031R01 - NRC Website

text

...

PALISADES PLANT NRC FORM366

<7*771 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT RE!>ORT CONTROL BLOCK: I 1 G)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!

1 e

[ilJJ IM Ir I PI A IL I 1 l@I o Io 1-l*o Io Io Io Io 1-lo Io 1<2)14 1111 I l I l 101 I I© 7

B 9

LICENSEE CODE 14

,5 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT &8 CON'T ITEJ 7

B

~~~~~ LlJ©I o I 5 I o Io Io I 215 15 K2)1 o 18 12 16 18 Io @I bl 912 I 3 I 81 o I@

60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

[))I] I During performance of control rod*interlock testing, group 1 rods withdrew to approx. 121 inches.

This resulted in unplanned reactivity insertion of 1.6 delta K/K, and is reportable per TS 6.9.2.A.4.

Report-ability determination made on 9-9-80. 'During period that rods were with-drawn, shutdown margin requirements were met, and reactor remained sub-

[II[] I critical.

[ill]

7 B 9 [ill]

7 8

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE COOE SUBCODE COMPONENT CODE SUSCODE SUBCODE IR IB I@ l!J@ l!J@) II I NIS IT JR IU I@ l!J@) l!J@

9 10 11 12 13 18 19 20 t:=:"I LERiRO LVENTYEAR

~

REPORT I 8 I 0 I NUMBER 21 22 SEQUENTIAL OCCURRENCE REPORT REPORT NO.

COOE TYPE I I 10 I 311 I I /I Io I 1 I l!J 23 24.

26 27 28 29 30 l=l 31 REVISION NO.

IQ.J 32 80 TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORM liUS.

ACTION FUTURE EFFECT SHUTDOWN ffi>

ATTACHMENT NPRD-4 PRIME COMP.

SUPPLIER COMPONENT MANUFACTURER UJ@W@ 11..J@ t1.J Io I 010 ! I l!J@ l!J@>

33 34 35 36 37 40 41 42 CAUSE DESCRIPTION AND CORREC'rlVE ACTIONS @

l!J@

43 JV 10 1615 I@

44 47 o:::I§] I Cause of excessive withdrawal was loss of both primary and secondary data loggers (see LER 80-32).

Corrective action included restoration of data loggers and reinsertion of control rods.

cr::m 7

8 9

FACILITY

/'jQ'I STATUS

% POWER OTHER STATUS \\::;/

[}TI] W I DI 0 I O l@l Hot Shutdown 7

B 9

10 12 13 44 A~~TY Q~NT Q

RELEASED OF RELEASE AMOUNT.OF ACTIVITY

[!TI] L!J@ EJ@I NA I

7 8

9 10 11 44 80

~'~

A DISCOVERY DISCOVERY DESCRIPTION ~

~@I Operator Observation

~

E

~

NA LOCATION OF RELEASE @

. BO PERSONNEL EXPOSURES t:::..

0 NuMaEP.o ~

T,XPE r.:;;.. DESCRIPTION~

IIIIl I I I 1'3'l:'.j~.__=NA:.:..-~~~~~~~~~~~~~~~~~~~~~~~

7 8* 9 11 12 13 PERSONNEL INJURIES

/,;";\\

NUMBER DESCRll'TION~

lJ]IJ IOI 010 l(§) __ ~*~_N_A~~~~~~~~~~~~~~~~~~~~~~--

80 7

B 9

11 12 80 LOSS O~ OR DAMAGE TO FACILITY t.iJ\\

TYPE

DESCRIPTION

';::I ITJI) ~@

NA 7

B 9

10 80 PUBLICITY

(.;;\\

ISSUED{.'.;\\ OESCRlnlON ~

NAC USE ONL y III£] L!J~~~~-*~~-NA~~~~~~~~~~~~~~~~~ I I I I I I I I I I I I I 7

8 9

10 6B 69 BO