ML19221A709
| ML19221A709 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/29/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Short T OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7907030128 | |
| Download: ML19221A709 (1) | |
Text
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,3 UNITED STATES e.
[T;<.(,' h NUCLEAR REGULATORY COMMISSION L
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May 29, 1979 Docket No.
50-285 Omaha Public Power District ATTN:
T. E. Short, Assistant General Manager 1623 Harney Street Omaha, Nebraska 68102 Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter.
It is expected that recipients vill review the informa-tioa for possible applicability to their f acilities. No specific action or responce is requested at this time. If further NRC evaluations'so indicate, an IE Circular or Bulletin vill be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
t Sincerely, f}
1 d4&
N r1 V. Seyfri Director
Enclosures:
1.
IE Information Notice No. 79-13 2.
List IE Information Notices Issued in 1979 2c:
R. L. Andrews, Manager Fort Calhoun Station Post Of fice Box 98 Fort Calhoun, Nebraska 68102 273 155 I907 0301 g g
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASIIINGTON, D.C.
20555 IE Information Notice No. 79-13 Date: May 29, 1979 Page 1 of 4 INDICATION OF LOW WATER LEVEL IN TIIE OYSTER CREEK REACTOR Summary A loss of feedwater t ransient 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 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 1 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 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 pgig reactor pressure 7.1x10{/hrfeedflow 14.8x10 gpm recirculation flow rate (4 pumps) 12 psid core delta p 7.-
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Equipment Out-of-Service (00S)
DUPLICATE DOCUMENT 273 156 "D" recirc pump 00S due to sea Fntire document previously entered "B" startup transformer 00S fo into system under:
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ANO No. of pages:
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