ML19330B105

RO 80-32 on 800723,charging Pumps 22,23 & 24 Were Placed Out of Svc for Mechanical Reasons,Leaving Charging Pump 21 W/O Emergency Power.Caused by Operator Failure to Verify safety-related Sys Out of Svc.Corrective Action Forthcoming

ML19330B105
Person / Time
Site:	Calvert Cliffs
Issue date:	07/24/1980
From:	Russell L BALTIMORE GAS & ELECTRIC CO.
To:
References
NUDOCS 8007300351
Download: ML19330B105 (1)

Text

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n July 240 1980 TO: Mr. B. H. Grier, Director Recion I. U.S.M.R.C.

FRON: L. B. Russell, Plant Superintendent Calvert Cliffs Nuclear Power Plant-

SUBJECT:

Docket No. 50-318; Violation of Technical specification 3.1.2.4 LER Mo. 80-32 _. _. _ . . . _ .

This report is to cocfirse our verbal notification to Mr. Ralph Architzel, of your office, as required by Technical Specification 6.9.1.8 (Prompt Notification with written follow-up) of a loss of all operable charoina pumos (T.S. 3.1.2.4) because all emergency power was unavailable. The event and cause descriptions are as follows.

On July 23, 1980, #21 charoing pump which is powered frees #21 A80 VAC Bus and #23 charping pumo which was being powered from #24 480 VAC Bus were operatino and suoplyinp normal make-up and reactivity control for the reactor coolant system. Mumber 22 charcino pump which is powered from 723 480 VAC Bus was out of service for riechanical maintenance. At 0807 #23 charoinn pump which receives power fron either #21 or f24 480 VAC Dusses was placed out of service when an Operator shifted power from #24 480 VAC

' Bus to f 21480 VAC Bus in order to troubleshoot a problem with f21480 VAC Bus charging pump breaker. This line-up left #21 chargina pump as the only operable charying pump, however, at 0920 #12 emertiency diesel oenerator (the swino diesel), which norr-ally supplies emeroency power to #21480 VAC Bus via #214 KV Bus was transferred to #114 KV Bus in order to supoly Unit I with a dedicated emeroency power supply while #11 energency diesel cenerator was out of service for corrective maintenance. This action Jaft .-. --

f21 charoing purso without an emeroency power supply which is contrary to the definition of OPERABt.E as defined in Technical Specification 1.6. At 115G #23 chsryiW#~p6rvp' was" tiiiifsTerred back to us 48U VAC' Bus and mtm #-~-~'

to operable status. Number 24 480 VAC Bus was capable of receiving ,

emernency power from #21 emeroency diesel cenerator via #23 4 KV Bus. The two offsite power sources and #21 emeroency diesel generator remained operable durino the event.

The cause for the event was the Operator's failure to verify which safety-related equipment was out of service prior to transfer of f12 emergency diesel generator from #214 KV to fil 4 KV Bus. A description of the correc-tive action will be contained in the follow-up report.

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m e W B. Ruhell Q Alant Superintendent i I '

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8007380 W I -

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