ML19330B105
| 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 1980 July 240 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.
m I
m e W B. Ruhell Q
Alant Superintendent i
I 1.BR/SMD/ola M rmrnvrmnnoa m
@Uud\\p]UUQ 8007380 W I
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