05000280/LER-1979-020-01, /01T-0 on 790606:abnormal Degradation of Cable Insulation on Emergency Power Sys Battery Charger Discovered at Cold Shutdown.Caused by Constant High Pressure Environ. Cable Will Be Replaced W/Cables of Higher Tolerance

/01T-0 on 790606:abnormal Degradation of Cable Insulation on Emergency Power Sys Battery Charger Discovered at Cold Shutdown.Caused by Constant High Pressure Environ. Cable Will Be Replaced W/Cables of Higher Tolerance

ML18114A709
Person / Time
Site:	Surry
Issue date:	06/18/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A708	List: 05000280/LER-1979-020, Forwards LER 79-020/01T-0 05000280/LER-1979-020-01, /01T-0 on 790606:abnormal Degradation of Cable Insulation on Emergency Power Sys Battery Charger Discovered at Cold Shutdown.Caused by Constant High Pressure Environ. Cable Will Be Replaced W/Cables of Higher Tolerance
References
LER-79-020-01T, LER-79-20-1T, NUDOCS 7906200405
Download: ML18114A709 (2)

LER-1979-020, /01T-0 on 790606:abnormal Degradation of Cable Insulation on Emergency Power Sys Battery Charger Discovered at Cold Shutdown.Caused by Constant High Pressure Environ. Cable Will Be Replaced W/Cables of Higher Tolerance

Event date:
Report date:
2801979020R01 - NRC Website

text

NHC FORM 366

- u-:~cc.~uoLA run r

• ..,u1v11v11v,JJ"U1,.

{7-77)

CONTROL BLOCK:

e LICENSEE EVENT REPORT

!--~-~-....___,_l _ _.l_....,J G)

(PLEASE PRINT OR TYPE I REQUIRED INFORMATION}

0

~

1v IA 1s IP I s1 1 101° 1° I-10 10 1° 1° 1° 1-101 olG)l 4! 111111 JJG)I ! 10 7

. 8 9

.LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE

lO 57 CAT 58 CON'T

=~~~~~ LLJ©lo Is lo lo lo 12 Is In IG)lo 60 61 DOCKET NUMBER 68 69 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

~

7 8

16 I o I 6 l 11 9 l@I o I 6 I 1 I s I 1 I 9 10 EVENT DATE 74 75 REPORT DATE 80

~

l With both units at cold shutdown, abnormal degradation of cable insulation on Emergency Power System battery chargers was discovered.

This is reportable per Technical Specification 6.6.2.a(9). The health and safety of the general public were not affected.

7 [§))] LI-----'-----~----------~--------------------'--------,,-'

80 8 9 liffi 7

8 SYSTEM CODE LE le I@

. 9 10 LER/RO CVENTYEAR REPORT I 71 91 NUMBER 21 22

CAUSE

CAUSE COMP.

CODE SUBCODE w@w@

COMPONENT CODE SUBCODE IE IL IE I c lo IN J@_ uj@)

11 12 13 12 19 SEQUENTIAL OCCURRENCE REPORT REPORT NO.

CODE TYPE VALVE SUBCODE l.LI@

20 ol 21 ol I /I I a I, I W

I I 23 24 26 27 28 29 30 31 ACTION FUTURE EFFECT SHUTDOWN

'(:;::;\\

ATTACHMENT.

TAKEN

._O.CTION ON PLANT METHOD HOURS SUBMITTED NPRD4 PRIME COMP.

FORM SUB.'

SUPPLIER REVISION NO.

LaJ 32 COMPONENT MANUFACTURER lli.J@.w@

42 43 LJ@W@ W@) ~ I 01 01 01 01. l.l.J@

33 34 35 36 37 40 41 IC I 1 A 7 l 3 1 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

44 The cable insulation deteriorau on was caused 'py a constaut bi gb teroperatu:ra @n1~:;! :rnn.

ment*~"

The affected cahl,:,s and those of aJ 1 other Em!ir'"g@ncy :Pou~r System. batc:c.ry I

chargers will be replaced with a cah] e nesi gr, 0 "1 for withstanding bi gber teuiperatur.;i~

7 8

9 FACILITY METH.OD OF 80 STATUS

% POWER DJ}] LJ@ j O J O l O l@)..._I _N_A ___

OTHER STATUS

.DISCOVERY DESCRIPTION @

r>ISCOVERY Li@

NA 8

9 10 12 1'3 ACTIVITY CONTENT Q\\

RELEASED OF RELEASE AMOUNT OF ACTIVITY

~

LzJ @) UC§)._! _..,.N..,,_A ______

8 9

10 11 7

7 44 45 46 80 LOCATION OF RELEASE @

NA 44 45 80 PERSONNEL EXPOSURES

~

8TI lo N[UQv\\3,; J@ITY~E!@L-D-ES_C_R_l.o-T-IO_~..i.;J-L.S.1:"-9----------------------------------'

7 B

9 11 12 13 80 PERSONNEL INJURIES

~

NUMBER DESCRIPTION~

ITTIJ I O I O I O l@.__-=NA..,,__ ________________________

7 B

9 11 12 LOSS OF OR DAMAGE TO FACILITY '43\\

TYPE

DESCRIPTION

\\;.:;)

80 Em W@I NA 1

B 91 ~o---~=-------------------------------'-'-----------'so PUBLICITY

~

NRC USE ONLY 1SSUE1?r,;-:;\\ DESCRIPTION~

ITiiJ W~J...___-=N=A __

. --'---------------------' I I I, I I 11 II I I I~

7 8

9 10 68 69 80 ;;;

NAME OF PREPARER ---'l;..:...i[~, _I:c,J.;:,.*' --=S'-"tc..=e""w... a,=rc...t~---------

PHONE: 806-357-3]86

Surry Power Station, Units Docket No: 50-280 Report No: 79-020/0lT-O Event Date: 06-06-79 1 & 2 Degradation of Emergency Power Station Battery Charger Cable Insulation

1.

Description of Event

With both units at cold shutdown and the Unit 2 core off-loaded, abnormal degradation of internal power cable insulation was discovered on battery charge1 2.B2..

The chargers are _manufactured by C & D Battery.

This event constitutes a condition reportable per Technical Specification 6.6.2.a.(9).

2.

Probable Consequences and Status of Redundant Systems:

The degradation of the battery charger cable insulation led to failure of battery charger 2B2.

With.both units at cold shutdown, the battery charger~

are not required.

However, sufficient redundancy exists in the Emergency Power System su_ch that a.charger failure could no.t render the system inoperable.

Therefore, t11e health and safety of the public were not affected.

3.

Cause

The manufacturer has been contacted in reference:to the cable insulation*

deterioration.

The manufacturer postulates that the cause of the. deter-ioration was the high temperature environment to which the cable was*

subjected.

4.

Immediate Corrective Action

The immediate corrective action was to contact the manufacturer in an effort to ftiscover the cause of the.deterioration.

5.

Subsequent Corrective Action:

The subsequent corrective action was to order new cable with an insulation designed to withstand higher temperatures than the old cable.

6.

Future Corrective Action The future corrective *.action will be to replace all affected cable.

7.

Generic Implications The degradation of this particular cable insulation could indicate a generic problem for similar installations and environments.