ML19263E537
| ML19263E537 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 05/29/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7906200058 | |
| Download: ML19263E537 (1) | |
Text
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- 1. AL OU i Cf El.1; Calli Oi!NI A O! M 3 May 29, 1979 Docket tio. 50-312 Sacramento Municipal Utility Distr >ct P. O. Box 16830 Sacramento, Califo.,in 95813 Attention: Mr. John J. Mattirace Assistant General fianager Gentlemen:
This Information riotice is provided as an early r.otification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
fio specific action or response is requested at this time.
If further flRC evaluations so indicate, an IE Circular or Bulletin will be issued to reco.mmend or request specific licensee actions.
If you have questions regarding the matter, please contact the Director of the appropriate fiRC Regional Of fice.
Sincerely, 4
,/
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(, 1 Q'{LCE' '"
/K. II EnI]elken
(/ Director I
Enclosure:
IE Information ?!otice fio. 79-13 2288 244 cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 7906200058
UNITED STATES i;UCLEAR REGULATORY COMMISSION OFFICE OF IllSPECTION AfiD ENFORCEtiEilT WASHIl!GTON, D.C.
20555 May 29, 1979 IE Information 110tice No. 79-13 INDICATION OF LOW WATER LEVEL Ill THE OYSTER CREEK REACTOR Summary A loss of feedwater transient at the Oyster Creek facility on flay 2, 1979, resulted in a significant reduction in water inventory within the reactor core shroud area as measured by one set of water level instruments (triple low level), while the remaining level instruments, sensing from the reactor annulus area indicated water levels above any protective feature setpoint (Figure 1).
The water level within the core shroud area was reduced below the " triple low level" setpoint of 4-feet, 8-inches above the top of the fuel.
Subsequent analysis by the licensee has determined that the minimum collapsed water level (solid, without steam voids) over the top of the fuel was I to 1-1/2 feet.
Coolant sample analyses and offgas release rates indicate that no fuel damage occurred.
General Oyster Creek is a non-jet pump BWR with licensed power of 1930 init.
The plant was first uade critical May 3,1969.
Status Before Transient Operating at near full power with the main parameters at levels as follows:
1895 MWt power level 79" Yarway (13'4" over top of fuel) reactor water level 1020pgigreactorpressure 7.1x10 #/hr feed flow 4
14.8x10 gpm recirculation flow rate (4 pumps) 12 psid core A p Equipment Out of Service (005)
"D" recirc pump 00$ due to "B" startup transformer 005 DUPLICATE DOCUMENT Entire document previously entered into system under:
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