ML19224C566
| ML19224C566 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/29/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| NUDOCS 7907030023 | |
| Download: ML19224C566 (1) | |
Text
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UNITED STATES
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NUCt.:'" ocGULATORY COMMISSION
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KING of PRUSSIA, PENNSYLV ANI A 13406 Docket No. 50-213 Con'necticut Yankee Atomic Power Company ATTN:
Mr. W. G. Counsil Vice President - Nuclear Engiraering and Operations P. O. Box 270 Hartford, Conne.cticut 06101 Gentlemen:
This Information Notice is provided as an early notification of a poss'.bly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No sps rific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Cir-cular 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,
/ khf e
Boyce H. Grier Director
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Enclosures:
1.
IE Information Notice No. 79-13 w/ enclosures 2.
List of Information Notices Issued in 1979 cc w/encis:
R. Graves, Plant Supe-intendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer 272 263 7907030o;;23
UNITED STATES NUCLEAR REGULATORY COMMISSION 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 WA7ER 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 crea as measured by one set of water level instruments (triple low level),
while the remaining level instruments, sensing fro,n 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 collaps" water level (solid, without steam voids) over the top of the fuel was 1 to 1-u2 feet.
Coolant sample analyses and offgas release rates indicate that no fuel damage occurred.
General Oyster Creek is a non-jet pump BWR with licennd power of 1930 biWt.
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 7.1x10o #/hr feed flow 4
14.8x10 gpm recirculation flow rate (4 pumps) 12 psid core Ap Equipment Out of Service (005)
D" recirc pump 00S due to seal coolE1L._-_____._,__
,"'B"startup transformer 00S for inspec DUPLICATE DOCUMENT}7] }64 Entire document previously entered
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790d*dd C /d h ANO No. of pages:
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