ML17340B416

Updated LER 80-030/03X-1:on 791110,during Scram Testing in Refuel Mode,Substantial Loss of Position Indication Noted for Control Rod Driveline H-9.Caused by Improperly Seated Socket,Suggesting Faulty Electrical pin-socket Alignment

ML17340B416
Person / Time
Site:	Dresden
Issue date:	03/26/1980
From:	COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17340B415	List: ML17340B414 ML17340B416
References
LER-79-030-03X, LER-79-30-3X, NUDOCS 8004080463
Download: ML17340B416 (2)

Text

B U. S. NUCLEAR REGULATORY COMMISSION PREVIOUS BZiPORT DATE 12-6-79" CONTROL BLOCK:

QLICENEEE EVENT REPORT ~

(PLEASE PRINT OR TYPE ALL REQUIREO INFORMATIONI Qi I 6 I L D R 8 3 Qt 0 0 0 0 0 0 0 0 Q. 4 I 1 I 1 Q4~Qs 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 7

CON'T

<<'oer iL i~a 0 3 0 0 0 2 4 9 r 1 1 1 0 7 9 s 0 3 2 6 8 0 Qs SOURCE 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES 10 During scrara testing in refuel mode, substantial loss of position indication was noted for CRD H-9. Per G.E. SDM analysis, Tech. Spec. 3.3.A41 met by disarmiT1g adjacent rods 0-9 and 3-9 at "00" and inserting 8-9 to 20, the first functional position. After subsequent GE SDM analysis, adjacent rods were fully withdrawn. To avoid rod drift-,

H-9 fully inserted (verified by TIPS) and disarmed. Safety significance minimal since SDM was always met. This is the first event of this magnitude.

~08 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCOOE SUBCOOE

~Os 8 Q ~EQ2 ~A 1 8 8 I 8 0 Qi4 ~EQis 19

~z 20 Qis 7 8 9 10 11 12 13 18 SEQUENTIAL OCCURRENCE REPORT REVISION Qit LER)RO Rssosr ACTION FUTURE EVENT YEAR

~19 21 22 EFFECT

+23 SHUTDOWN

~03 24 REPORT No.

0 26

+~

27

~03 28 ATTACHMENT CODE 29 NPROA TYPE

+I 30 PRIME COMP.

Q 31 No.

QI 32 COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER A Qis ~ZQis ~CQao ~ZQ>> O O O O ~WQ>> ~mQ24 ~~Q>> 0 O 8 O Q><

33 34 35 36 37 40 41 42 43 44 47 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS 27 o Inspection of rod position indicator probe revealed that socket was not ro erl seated suggesting that electrical pin-socket alignment had been fault . Entire Drobe was replaced and correct rod position indication was restored.

3 4

80 8 9

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7 FACILITY METHOD OF STATUS  % POWER OTHCR STATUS DISCOVERY DISCOVERY DESCRIPTION 32

~I5 ~~ Qts ~~~ 0 Q>> eA ~SQai 0 era tor Ob servation 7 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 7

4 8 9 Z Q>> I 10 Q34 8/A 45 N A 80 PERSONNEI. EXPOSURES NUMBER TYPE DESCRIPTION ZEH8 ~00 0 QtLzJQts N/A 80 7 9 II 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION 41

~00 O Q4o N/A 80 7 9 11 12 LOSS OF OR DAMAGE TO FACILITY 43 TYPE DESCRIPTION

~is z Q42 N/A 80 7 8 9 10 PUBLICITY ,NRC USE ONLY ISSUED DESCRIPTION

~o LXJQ N/A 8 00406 o4 4

7 8 9 10 68 69 80 ~ o