ML19224C584
| ML19224C584 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/29/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7907030041 | |
| Download: ML19224C584 (1) | |
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+ 3 '3 Docket Nos. 50-336 MaY 29' 1979 50-245 50-423 Northeast Nuclear Energy Company ATTN:
Mr. W. G. Counsil Vice President - Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Gentlemen:
This Information Notice is provided as an early notification c: a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No spcific actisa or response is requested at this time.
If further NRC evaluations so indicate, an IE Cir-culae or Bulletin will 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.
Sincerely, f
M Y
se dL Boyce H. Grie Director
Enclosures:
1 IE Information Notice No. 79-13 w/ enclosures 2.
List of Information Notices Issued in 1979 cc w/encls:
K. W. Gray, Construction Quality Assurance Lead H. R. Nims, Director of Nuclear Projects J. F. Cpeka, Station Superintendent D. 3. Diedrick, Manager of Quality Assurance J. R. Himelwright, Licensing Safeguards Engineer A. Z. Roisman, Natural Resources Defense Council 272 299 7907030047
UNITED STATES NUCLEAR REGULATORY COMM;SSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Information Notice No. 79-13 Date:
May 29, 1979 Page 1 of 4 INDICATION OF LOW WATER LEVEL IN THE OYSTER CREEK REACTOR Summary A loss of feedwater 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 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 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 p 7.1x10gigreactorpressure
- /hr feed flow 4
14.8x10 gpm recirculation flow rate (4 pumps) 12 psid core op EquipmentOutofService(00S)
"D" recirc pump 005 due to seal coole DUPLICATE DOCUMENT "B" startup transformer 005 for insp h red in o sy em un er
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