ML19263E579
| ML19263E579 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 05/29/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Linder F DAIRYLAND POWER COOPERATIVE |
| References | |
| NUDOCS 7906200116 | |
| Download: ML19263E579 (1) | |
Text
9 B "800 UNITED STATES f*pk I'
NUCLEAR REGULATORY COMMISSION.
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.f CLEN ELLYN, ILLINOIS 60137 NAY 2 91979 Docket No. 50-409 Dairyland Power Coor>erative ATTN:
Mr. F. W. Linder General Manager 2615 East Avenue - South La Crosse, WI 54601 Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If further h3C evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please epntact the Director of this office.
Sincerely, JamesG.$
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W Kepp er Director
Enclosure:
IE Information Notice No. 79-13 cc w/ encl:
Mr. R. E. Shimshak, Plant Superintendent Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC 2288 282 hony Roisman, Esq.,
Attorney 7 9 0 6 20 01 (G,
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U.S. FUCLEAR REGULATORY COMMISSION
[' $M OFFICE OF INSFECTION AND ENFORCEMENT REGION III May 29, 1979 IE Information Notice No. 79-13 INDICATION OF LOW WATER LEVEL IN THE OYSTER CREEK REACTOR Sum =ary A loss of feedvater transient at the Oyster Creek facility on May 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 instrumancs, 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 1 to 1-1/2 feet.
Coolant sa=ple analyses and offgas release rates do not indicate any fuel damage occurred.
General Oyster Creek is a non-jet pump BUR with licensed power of 1930 MWt. The plant was first made 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 1020 psig reactor pressure 7.1x106 f /hr feedflow 2288 283 14.8x104 gpm recirculation flow rate (4 pumps) 12 paid core op Equipment Out of Service (00s)
"D" recire pump 00S due to sea DUPLICATE DOCUMENT "B" startup transformer 00S fo Entire document previously entered into system under:
ANO No. of pages:
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