ML19317F984
| ML19317F984 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/22/1976 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML19317F985 | List: |
| References | |
| NUDOCS 8002210688 | |
| Download: ML19317F984 (2) | |
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^ SACRAMENTO MUNICIPAL UTillTY DISTRICT C2 1708 59th Street. Dox 15830, Sacramento, California 95813;(916)452-3211.
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-April 22, 1976 Mr. R. H. Engelken q)
Director of Regulatory Operations p
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NRC Operations Of fice, Region V p
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1990 H. California Boulevard L
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% APR261976
- l>9 Walnut Creek Plaza, Suite 202 Walnut Creek, Ca. 94596 u s. omcu.n,ss,,e,,u,,,,
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co RE: Operating License DPR-54 h,
Docket No. 50-312 Reportable Occurrence 76-5 g@
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Dear Mr. Engelken:
As defined by Technical Specifications for Rancho Seco Nuclear Generatingd Station,Section6.91,andRegulatoryGuide1.16,ResIsion4,Sec'tionC.2,.6.27 the Sacramento. Municipal Utility District is hereby reporting the following Reportable' Occurrence as R0-76-5 On March 23, 1976, with the plant operating at a steady state power
-f p't level of ' 100. percent, High Pressure injection Pump (P-238A) tripped with no
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alarm Indication. The Makeup and Puri fication System was ali gned such that P-238A was supplying normal makeup and RCP seals flow.
High Pressure injec-tion Pump (P-2388) and the Makeup Pump (P-236) were operable and available
- for high pressure injection if necessary. To prevent damage to tFe 'eactor Coolant Pumps from loss of seal supply, the makeup pump was started i mmed i - y*
ately in acc.ordanc~ ".wi tidoperating procedures. This reduced the vibration e
readings in Reactor Coolant Pump A from 18 mils to 13 mils over a period of,'
5 to 10 minutes.. Af ter approximately I hour, vibration levels in RCP-A were reduced to 10 mils.
it was initially felt -that a faulty pressure switch in the Lube Oil 1
System caused the trip, however, subsequent testing could not locate any faulty components that could have. caused the trip; and the occurrence could not be replicated.
It was determined that an unidentifir d spurious signal caused this trip. The system was found to be in proper working order, and -
the pump was returned to service in the high. pressure and is operating = satisfactorily.
iejection,funct. ion.
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This -trip did not reduce the ef fectiveness of safety systems in any way due to' the availibility of the ot;her two pumps for high pressure 2.
/"k) 8002210 [ @
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m: n f A r. s t i t c t,i i c s is i t u ls t e v i s : f.t o k E IHAN 600;000 * *1 THE NEARr GF-CatIFORNiA
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l April 22, 1976-Mr. R. 11. Engelken Page 2 i nje c t i on.'
in the event of future occurrences of this type, more extensive testing may be necessary. The pump is a Byron-Jackson, Serial No.
691-it-0078/80, multistage centri fugal pump supplied by Babcock and Wilcox.
There was no transient associated with this event.
Respectfully, 4
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J. J. Mattimoe Assistant General Manager
. 1 and Chief Engineer
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