ML19221A690
| ML19221A690 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 05/29/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 7907030077 | |
| Download: ML19221A690 (1) | |
Text
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UNITED STATES 4
y D"e(, j NUCLEAR REGULATORY COMMISClON
.- C REGION I
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631 PARK AVENUE d
KING OF PRUSSIA, PENNSYLVANI A 19406
'g May 29,1979 Docket No. 50-271 Vermont Yankee Nuclear Power Corporation ATTN:
Mr. Robert H. Groce
' icensing Engineer 20 Turn:ike Road Westborough, tiassachusetts 01581 Gentlemen.
This Infarmation Notice is provided as an early notification of a possibly signi fi'. ant matter.
It is expected that recipients will review the information for possible applicabilicy to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Cir-cular Jr Bulletin vill be issued to recommend or request specific licensee acticas.
If yo nave questions regarding this matter, please contact the Dirr.ctor of the appropriate NRC Regional Office.
Sincerely, k, (4
~
C4m W
g Boyce H. Grier Director
Enclosures:
1.
IE Information Notice No. 79-13 w/ enclosures 2.
List of Information Notices Issued in 1979 cc w/encis:
W. F. Conway, Plant Superintendent Ms. J. Abbey, Technical Secretary A. Z. Roisman, Natural Resources Defense Council 273 053 7907030077,
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 WATER LEVEL i.: THE OYSTER CREEK REACTOR Sumary A loss of feedwater transient at the Oyster Creek facility on May 2,1979, re mited 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 tne remaining level instrumerits, 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 determinid 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 psig reactor pressure 7.1x100 #/hr feed flow 4
14.8x10 gpn recirculation flow rate (4 oumps) 12 psid core ap Equipment Cut of Service (005)
"D" recirc pump 00S due to seal coolf DUPLICATE DOCUMENT
/3 U J' 4 "B" startup transformer 00S for inspc Entire document previously entered into system under:
~79/746[d/$
No. of pages:
1
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