ML18024A842

LER 79-009/03L-0 on 790510:scram Accumulator Level Switch LS-2-85-34 for Control Rod Drivelines 58-39 & 58-19 Failed to Give Annunciation for High Accumulator Level.Caused by Switch Failure

ML18024A842
Person / Time
Site:	Browns Ferry
Issue date:	06/06/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A841	List: ML18024A840 ML18024A842
References
LER-79-009-03L, LER-79-9-3L, NUDOCS 7906120389
Download: ML18024A842 (4)

Text

NRC EORM 366 U. CLEAR REGULATORY COMMISSION

= I777I LICENSEE EVENT REPORT CONTROL BLOCK: Qi (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I 6

~01 A L B R F 2 14 QE 15 0 0 0 0 0 LICENSE NUMBER 0 0 0 0 25 Q24 26 1 1 1 LICENSE TYPE 1

30 QE~QE 57 CAT 58 7 8 9 LICENSEE CODE E CON'T REPDRT 0 5 0 0 0 2 6 0 0 5 1 0 7 9 6 0 6 0 6 7 9 Qs

~0 ULQ6 7 74 75 REPORT DATE 60 GI DOCKET NUMBER 68 69 EVENT DATE EVENT OFSCRIPTION AND PROOAOLE CONSEQUENCES QIO 0 2 During a refueling outage, while erformin EMI-50 scram accumulator level switch LS-2-85-34 for CRD' 58-39 and 58-19 would not operate to ive annunciation for hi h 4 accumulator level as required by T. S. 3. 3.A. 2. e. There are no redundant s stems.

There was no hazard to the public health or safety. Previous occurrence: 259/7836, 259/7725.

[oOr)

~06 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE 7 8 9 CODE A

10 QTT CODE

~E 11 QTE SUBCODE

~E 12 QEO SEOUENTIAL 13 COMPONENT CODE 18 OCCURRENCE Q14

~ ~

SUBCOOE 19 REPORT Q15 SUBCODE 20 Q16 REVISION Q17 LER7RD REPORT EVENT YEAR

~79 21 22

~23

~QP 24 REPORT NO.

9 26 U<

ATTACHMENT CODE Loire'~J NPRDQ TYPE PRIME COMP.

U NO.

LpJ COMPONENT ACTION FUTURE TAKEN ACTION EFFECT ON PLANT SHUTDOWN METHOD HOURS Q22 SUBMITTED FORM SUB. SUPPLIER .MANUFACTURER 0 0 UAQIS Uz QI0 Uz Q20 Uz Q2 L~J Q23 UNQ24 L~J Q25 G 5 Q26 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 0 The cause of the failure of swi GE art NR 117C1434P1 is unknown as the switch is enclosed in e ox and cleanin of the actu-ator did not correct the roblem. The switches were re laced and subse uent s stem 3 operation was satisfactor . The failures were random and no recurrence control action 4 is re uired. 80 7 8 9 FACILITY STATUS 94 POWER OTHER STATUS Q METHOD OF DISCOVERY Electrical

~ DISCOVERY DESCRIPTION Q32 Instruction H Q29 ~00 0 12 Q29 NA 44 UB 45 Q31 46 Maintenance 80 7 8 9 10 13

'CTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY Q LOCATION OF RELEASE Q DZa8 7

uuO 9

aQ34 10 11 44 45 NA 80 PERSONNEL EXPOSURES NUINBER TYPE DESCRIPTION Q39 0 Q" ~iQ29 .

8 9 11 12 13 80 7

PERSONNEI. INJURIES

[i'] ~00 7 8 9 NUMBER 0

11 Qio DESCRIPTIONQ41 12 LOSS OF OR DAMAGE TO FACILITY NA 80 TYPE DESCRIPTION Q43

~ZQ42 NA 9 10 80 ISSUED PUBLICITY DESCRIPTION ~ ~9 o6 I a 03ay NRC USE ONLY 7

0 8

~NQ<<NA 9 10 GB 69 80 o 0

a NAME OF PREPARER PHONE:

C JI '

Form BF-17 BF 15.2 6/09/78 LER SUPPLEMENTAL INFORMATION BFRO 26o / 799 'echnical Specification Involved Reported Under Technical Specification 6. 7.2.b(1)

Date of Occurrence / /'ime of Occurrence unkn wn Unit 2 Identification and Descri tion of Occurrence:

While performing Electrical Maintenance Instruction-50, scram accumulator level switch LS-2-85-s4 for CRD's 58-39 and 58-19 would not operate to give annunciation for high accumulator level.

Conditions Prior to Occurrence:

Refueling outage in progress.

Action specified in the Technical Specification Surveillance Requirements met due to ino erable e ui ment. Describe.

Unit was shut down, thus no action was required other than declaring the CRD mechanisms inoperable until repaired.

A arent Cause of Occurrence:

The cause of the failure of switch LS-2-85-34, GEM's Inc., liquid level switch, GE Part NR117C1434P1, is unknown as the switch is enclosed in epoxy; and cleaning of the actuating mechanism did not correct the problem.

Anal sis of Occurrence:

There was no hazard to the public health or safety.i Corrective Action:.

The switches were replaced and subsequent system operation was satisfactory.

Failure Data:

259/7836, 259/7725 Tennessee Valley Authority - Browns'erry Nuclear Plant