ML18114A481

LER 79-011/03L-0 on 790328:while in Cold Shutdown,Gaseous Monitors Process Vent Particulate & Ventilation Vent Particulate Were W/O Power.Caused by Loose Lug Connection on Power Supply Cable.Lug Connection Repaired

ML18114A481
Person / Time
Site:	Surry
Issue date:	04/27/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A480	List: ML18114A479 ML18114A481
References
LER-79-011-03L-01, LER-79-11-3L-1, NUDOCS 7905010498
Download: ML18114A481 (2)

Text

{{#Wiki_filter:NRC FORM 366 (7-77) * '---L--'--~_...._I __,____.I G) 6 LICENSEE EVENT REPORT e (PLEASE PRINT OR TYPE.ALL REQUIRED INFORMATION) ., CONTROL BLOCK: [Ifil I v I A I s I P" I s I~ @.__I o___._l o_!'---__.l_o__,l_o_,_! _o _._! _o .,.._I _o _._I *_* ~_._I ~o~I --'o 10( 4 I 1 I 1 ! 1 ! 7 8 9 LICE:NSEE CODE 14 15 LICENSE NUMB.ER 25 26 LICENSE TYPE ;ilG)[ i 10 30 57 CAT 58 CON'T [ill] 7 8 ~G) I o I s I o I o I o I 2 I s I o 101 o I 3 I 21 sJ 7 I 9 IG) I o I 4 ! 2 ! 1 I 7 l 9 I G) 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75. REPORTD/\TE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ j On two occasions with both units at cold shutdown, the Process Vent Particulate and I Gaseous monitors and the Ventilation Vent Particulate and Gaseous monitors were [[IIJ I out power because of a loose lug connection on a power supply cable. This is contrarv I [§]}] I to Technical Specifications 3.11.B.4 and is reportable as per Technical Specifications [Q]IJ 16,6.2.B.(2). The health and safety of the general public were not affected. [ill] [9J]J 7 8 9 SYSTEM CODE CAUSE CAUSE CODE SUBCODE COMP. COMPONENT CODE SUBCODE VALVE SUBCODE [ill] IM IC I@ ~@ ~@ 1 I , NI s T , R , u ,e L!J@ ~@ 7 8 9 10 11 12 13 Q LER/RO CVENT YEAR REPORT 17 I 9 I NUMBER 21 22 l.=l 23 ACTION FUTURE EFFECT SHUTDOWN SEQUENTIAL REPORT NO. I O 1 1 I 1 I 24 26 TAKEN ACTION ON PLANT METHOD HOURS J/I 27 18 OCCURRENCE CODE 01 3J 19 REPORT TYPE 20 28 29 30 NPRD-4 FORM SUB. 31 PRIME C.OMP. SUPPLIER REVISION NO. l_£)_J 32 COMPONENT MANUFACTURER 80 Ll@~@ ~@ ~ 1_0 10 10 33 34 35 36 37 C:z2') ATTACHMENT it( SUBMITTED I I L2J@ 40 41 ~§ **LJ@ I I I I@ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @ 42 43 44 47 jThis event was caused by a loose lug connection on the power supply lead which supplies! o:::IIJ I power to these radiation monitors. Both units were shutdown and port ions of the abnor-f o::I1J 1 mal procedure p~rtinent to plant *conditions were performed. Investigation of the firstj CIII] !event attributed the failure to a blown fuse. After the second event, the loose con-IJ:JTI 1 nection was discovered, repaired, and the monitors were restored to service. 7 8 9 FACILITY STATUS o=ill ~@ % POWER I O I O I O I@)! OTHER STATUS 0 VASPS2 Defuele~ 7 8 9 10 12 13 44 ACTIVITY CONTENT r:;;,.. RELEASED OF RELEASE A~OUNT OF ACTIVITY [Qij l:J@) l:J@L-1 ____ N_A ___ ____, 7 8 9 10 11 44 PERSONNEL EXPOSURES r:;;:;,. METHOD OF t:;:°;\ DISCOVERY . DISCOVERY DESCRIPTION '2v ~@I Observ~t ion . 45 46 NA LOCATIO.N OF RELEASE@ 45 80 80 80 NUMBER TYPE DESCRIPTION GTIJ j O IO j O J@)t:J@L-N-TA _________________________ __, 7 8 9 .11 12 13 80 PERSONNEL INJURIES

• Q NU!',1BER DESCRIPTION6

[1JTI 10 I u 10 l@L--_N_A ______________________ -,--_ ___. 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY '43' TYPE DESCRIPTION NA 7 8 9 10 80 ISSJJ:i~~;;CRIPTION@ 790501. O'tC( i NRC USE ONLY ~e,L--__ N_A ___________________ -:!_ I I I I I I I I., I I I I~ 7 8 9 1 O 68 6 9 80 ;;; W. L. Stewart NAME OF PREPARER------------------- 804-357-3184 PHONE:------------- 0 a. Cl

• .j (Attachment, page ~f 1) Surry Power Station, Units 1 & 2 ~ocket No.: 50-280, 50-281 Report No.: 79-011/0JL-0 Event Date: 03/28/79 Title of Report: R?diation Monitor Loss of Power i. Description of Event: On two occasions, 3-28-79 and 4-25-79, with both units at cold shutdown, it was observed by Operations personnel that the following radiation monitors were without power: Process Vent-Particulate monitor (RM-GW-101), Process Vent-Gas monitor (RM-GW-102), Ventilation ticulate mon1tor (RM-VG-103) and Ventilation Vent Gas monitor (RM-VG-104).

This i;:; cop.trary to Technical Specificatio:r:.s 3.11.b.4 arid is reportable as per Technical Specifications 6.6.2.b.(2).

2. Probable Consequences and Status of Redundant Systems: During the periods these monitors were out of service, there were no significant giseous releases noted by Health Physics accountability sampling of the Process Vent and Ventilation Vent systems. The health and safety of the general public were not affected.

3. Cause: On 3/28/79, the loss of power was attributed to a blown fuse. After the second event, subsequent investigation determined both events were caused by a loose lug connection located on the power supply lead, which supplies the power to these radia~i~n monitors.

This is considered a random event. 4. Immediate Corrective Action: Both units were at cold shutdown and the portions of the abnormal procedure pertinent to the plant conditions were performed. The loose *connection was repaired and the affected monitors were restored to service. The monitors were without power during these events for 90 and 12 minutes respectively.

5. Subsequent Corrective Action: No further corrective action will be required.

6. Action Taken to Prevent Recurrence:

No action will be required since the failure was a random occurrence.

7. Generic Implications:

None.}}