ML20010B691

LER 81-045/03L-0:on 810706,operator Received Downscale Alarm on Reactor Bldg,Fuel Pool & Isolation Condenser Vent Radiation Monitor.Caused by Power Loss Due to Loose Connection in Power Supply Cable.Cable Reconnected

ML20010B691
Person / Time
Site:	Dresden
Issue date:	08/03/1981
From:	Rhee S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010B689	List: ML20010B688 ML20010B691
References
LER-81-045-03L, LER-81-45-3L, NUDOCS 8108170409
Download: ML20010B691 (2)

Text

NnC FORM aos - - - - - - - - - - - --

2 _-__ u.s.NucLEAn cEGULATCRY COMMIS$10N __

a.m ..

i e LICENSEE EVENT REPORT NTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) 1 6 lo l 1 l l I l L l D l R lS l 2 l@l 0 l 0 l -l 0 l 0 l 0 l 0 l 0 l- l0 l0 lgl 4 l 1l 1 l 1l 1 l@l l lg 7 8 9 LICENSEE CODE 14 15 UCENSE NUMSER 25 26 UCENSE TYPE JO 57 CAT 58 . _ _

CON T

"' ~

Ioi1I so$"CE l L l@[0 l 5DOCKET

[0 l0NUMBER l0 [2 l 3 l 687 @[ O' lEVENT 7 l DATE 0 l 6 l 8 74l1 @l 0lREPORT 8 l 0lQATE 3l 8 l180l@

? 8 60 61 69 75 I

EVENT DESCRil' TION AND PROSASLE CONSEQUENCES h Lo l 2 l l During normal Enit operation, the unit operator received down scale alarm on Reactor l l o 13 l l Bldg Fuel Pool and Isolation Condenser Vent Radiation Monitor. The "B" Channel left l

[o l4; l downscale and placed in degraded equipment log. There was no effect on public health l lo Isl I or safety, since redundant Channel "A" was operable. There was no previous evept of  ;

Io Ie l l this kind. l lol7ll l 10181I l 7 8 9 . So So[: E Ye"oY suSCo$E CouPosENT Co0E SUS O'E 5 E l 0 l 9 l' lMlCl@ @ l Xl@ l Il Nl Sl Tl Rl Ul@ l P l@ y @ 20 7 8 9 to 11 12 13 18 19

,,,, SEQUENTIAL OCCURRENCE REPORT REVISloN gggfpo EVENT YEAR REPORT No. CoOE TYPE No.

@ ,REgg l218 22l1 l l_l D

l0l4l5l 24 26 lpl 27 l0l3l N a lL l 30 g

31 l0 l 32 KN oP T ME 64oVRE 22 58 i PCR t. L MA UP C RER ..

l,33,,B,,,,jgl34Z l g l5Z lg 3

J@

36 l0l0l0l 37 40 l g g lN lg 41 42 l43N l@ l44G l 0 l 8 l 047[@_ --

CAUSE CESCRIPTION AND CORRECTIVE ACTIONS 27

, ,o ; j The catise of this event was power loss due to loose connection in the power supply ,

, ,,,g cable. This cable was reconnected and channel "B" was back in service within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. ,

, g No further corrective action deemed necessary. g I 131 I l t i l41 I l 7 8 9 So A  % POWE I CTHER STATUS IS Y OlSCQVERY QESCRIPTION NA lAlgl Operating Event l l t l 58 l lE l@ l 0 l 8 l 212[@l13 7 1 44 l

46 46 80 f.ELEASE AMOUNT CP ACTIVITY L T10N CP RELEASE i 1t ls l y @D OFRELEAsElZl@l NA l l b l

,EasoN~d ExPeseEs NUMBER TYet oEsCRiPrioN@ NA l , l 7 l l 0 l 0 l0 l@l Z j@l l

,ERseNNEL im'!iEs oEsCRiPTic~@ NA I1 I a 7 8 9 i 10~iuU8ER10 l@l 11 12 80 l

l 1 9

'r$y lI@l

' " *"^

esc,,c'oN T

b NA l-l ,

pugu$ry 8108170409 810803

,- NRc USE.ONLY issued cEsCRipncN PDR ADOCK 05000237 -

12lolLN_jhl NA S PDR. l lllllllll1Id :;

7 8 9 10 68 69 80 5 .

Sang J. Rhee 815-942-2920 Ext. 526- *o l NAME OF PAFPAREA DWONS-

_ . _ - ~ . _ . , _ . , , _ . , _ _ . - _ _ .

. 4

.: DEVIATION REPORT

. ( _ ^)7 DVR NO.

Commonwealth Ed.ison STA UNIT YEAR NO.

e 2 75 PART 1l Tl TLE OF DEV1ATION OC RE

> Loce of Power Supply i*er process Monitors care riye SYSTEM AFFECTED 1700 PLANT CONDITIONS TESilNG Process Radiation Run 2121 680 DESCRIPilON OF EVENT Rsceived vent toonitor down scale alarm on 902-3 PNL. Investigation revealed power supply for "B" Channel Isolation Condenser Vent Monitor, Reactor Bldg. Fuel Pool and Rx Bldg. Vent Monitor Rs: ding 225V ("A" power supply at 595V).

DESCRIPTION OF CAUSE Logo of power supply cause unknown

~~0THER APPLICABLE INFORMATION Logged in degraded equipment log.

EQUIPMENT YE5 DR NO. WR NO.

Bob Herbert 7/6/81 FAILURE NO -

D14564 RESPONSIBLE SUPERVISOR DATE PART 2 l OPERATING ENGINEERS COMMENTS Powar supply repaired in less than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> SAFETY-TYPE OF DEVI ATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE Og URRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTI NG WR ISSUED 10CFR21 YES X YES X 14 DAY _

l'l30 DAY ,6IF(Cy(CN

_ NO NO REPORTABLE CCCURRENCE ACTION ITEM NO. PROMPT ON-SI TE NOTI FICATION

"#0 C. E. Sargent 7/7/81 1700

Oct 81-45/03L-0 i E DATE TIME TITLE DATE TIME 24-HOUR NRC NOTIFICATION (Courtesy) PROMPT OFF-SITE NOTIFICATION TPh Mike Jordan 7/6/81 31500 F. A. Palmer 7/8/81_ 9:04 REGION lii DATE TIME TI TL E DATE TIME TGM REGION lli & COL CATE TIME TITLE DATE TIME RESPONSI BLE COMP ANY O FFI CER INFOMAED Or 10 CFR 21 OON D I T I ON S AND THEIR DEPORT TO NPC

• TITLE DATE TiMt.

REV1 EW AND COMPLETED John W. Wujciga 7/6/81 OPERATING ENG6 NELH DATE g- ' * ' '

ACCEPTANCE BY STATION REVIEW o - -

AS RECUIRED - JW *w DATE ' -

RESOLUTION APPROVED AND 'I AUTHORIZED FOR DISTRIBUTION - STAT $ R I N TEN' DEN T DATE .I

..s,,. ic n uo . is.sa- o II 1