ML19331B866

LER 80-032/01T-0:on 800723,emergency Power Supply Removed from 21 Charging Pump While Redundant Pumps Inoperable Due to Maint.Caused by Operator Failure to Verify Which safety- Related Equipment Out of Svc.Instructions Changed

ML19331B866
Person / Time
Site:	Calvert Cliffs
Issue date:	08/06/1980
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19331B865	List: ML19331B864 ML19331B866
References
LER-80-032-01T, LER-80-32-1T, NUDOCS 8008130446
Download: ML19331B866 (2)

Text

. .- _

LICENSEE EVENT REPORT CONTROL block: I l l l l l (PLEASE PRINT CR TYPE ALL KEQUIRED INFcRMATION)

Io

)

TT'l 8 9 l M LIGENsEE I o l cCODE I c I N 12 l@l o lo I- LICENSE 14 15 10 loNUM8ER lo lo lo I- 1010 25 I@l4 26 11 LICENSE 11TYPE 11JO11 l'@l I 57 CAT $8 l@

CON'T IoIiI I 8 sU LLJ@l 60 o I s I DOCK 61 o I EToNUM8Io EIR 3 Ii Ia6s l@La.17 69 I2 h I a in l@ln EVENT DATE . 74 75 la In Ia REPORT DATEIa In80l@

EVENT DESCRIPTION ANo PROBABLE CONSEQUENCES h io i2i l At 0920 the Emergency power supply was removed from #21 charging pump (chg pp) l ITTT1 I causing #21 cha op to become inoperable as defined by T.S.1.6. However. 'a t i 1o 141 I the same time the two redundant chg ops were inoperable due to maintenance J ioisi las allowed by T.S. 3.1.2.4. At 1156 #23 chg pp was returned to operable 1 i o is i I status. The two offsite power sources and the emergency power supply for I l o t :1 l #23 chg pp remained operable during the event. This is not a repetitive l I

Ioee1Ioccurrence. 80 7 8 9 E CCCE s' SC E COMPONENT CODE suSCCDE  : E loist 7 8 l Rl B l@ l A l@ l Al@ l Pl Ul Ml Pl Xl O@ I E l@ 23lZ l@

9 to 11 12 13 18 19 LEReRO EVENTYEAR REP RT C DE N .

O at su g I 81 ol 21 22 l-l 23 I o l 31 21 24 26 1/1 27 10!11 28 29 IT I 30 l-l 31 101 32 TKN AC N O P NT MET HOURS SB i 80R B. s PPLI MANUPACTURER lG 33 l@L3J@

34 12 35 l@ l36 zi@ l of ol ol 01 37 40 l Yl@

41 lNl@ lNi@ lAl4I719]@;

42 43 44 47 CAUSC DESCRIP' ion AND CORRECTIVE ACTIONS 27 11 toiIThe cause was the Operator's failure to verify which safety-related eouioment I m Iwas out of service prior to removing emergency oower suoplies from service. I r i # 2 F I To orevent recurrence of this event accrooriate instructions will be chanced I li i a l I to reouire the coerator to document that he has administrativp1v verified coprability l i i 14 i I of reduridant equipment prior to placinq safety-related eouipment out of service. _l

'sT#UY sPowtR oTHER STATUS @ "EC?vi8v' oisCOvEnv CEsCRierioN @

li is i LE,j@ 11 lo lo l@l NA l l4 A l@l too review I

' ' '2 n u 80 A!riv,u CO'4 TENT RELEASED OP RELEASE AMOUNT OP ACTIVITv LOCATION OF RELEASE l NA l l NA l Ii Ie I LI.J @ LI.J@sEs PERso~NELExPos NUMBER TYPE DESCRIPTION NA l l117 I 1010 l 0 ]@l Z i@l

' ' ' PERSONNEL'iN;uks '

NUMBER CEsCRIPTION l

7 i a 8 9 1010101@l12 11 NA 80

' 45E "Js'C ?T !N *'" @

l i I 9 l l ,Zj@l NA- l 7 8 9 to 80 issued oEsCR'PTION ,

121011Ni@l NA I IIIIIIIiiIIIli

, 7 8 9 10 68 69 80 ;

NAME OF PREPARER S M- UAViC PHONE: (301)269-4742 2,

_g008130 T(a r

~

i LER NO. 80-32/1T -

DOCKET NO. 50-318

. EVENT DATE 07/23/80 REPORT- DATE 08/06/80 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEQUENCES:

On July 23, 1980, #21 charging pump which is powered from #21 480 VAC Bus.

and #23 charging pump which was being powered from #24 480 VAC Bus were operating and supplying normal make-up and reactivity control for the reactor coolant system. Number 22 charging pump which is powered from #24 480 VAC Bus was out of service for mechanical maintenance. At 0807 #23 charging pump which receives power from either #21 or #24 480 VAC Busses was placed out of service when an Operator shifted power from #24 480 VAC Bus to #21480 VAC Bus in order to troubleshoot a problem with #214E0 VAC Bus charging pump breaker. This line-up left #21 charging pump as the only operable charging pump, however, at 0920 #12 emergency diesel generator (the swing diesel), which normally supplies emergency power to !21480 VAC Bus via #214 KV Bus was transferred to #114 KV Bus in order to supply Unit I with a dedicated emergency power supply while #11 emergency diesel generator was out of service for corrective maintenance. This action left

1. 21 charging pump without an emergency power supply which is contrary to the definition of OPERABLE as defined in Technical Specification 1.5. At 1156 f23 charging pump was transferred back to #24 480 VAC Bus and returned to operable status. Number 24 480 VAC Bus was capable of receiving emergency power from #21 emergency diesel generator via #23 4 KV Bus. The two offsite power sources and #21 emergency diesel generator remained

, operable during the event.

l CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

The cause was tse Operator's failure to verify which safety-related equipment was out of service prior to transfer of #12 emergency diesel generator from

1. 21 4 KV to #11 4 KV Buss. The corrective action requires the Operator to document in his log that he has administrative 1y verified operability of redundant safety-related equipment prior to placing equipment out of service.

1 i

l-t i

.