ML19263E534
| ML19263E534 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 05/29/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7906200052 | |
| Download: ML19263E534 (1) | |
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4 4,$e r!AL NU T CM I i, C '.L IFOI;NI A O E9n liay 29, 1979 Docket flos. 50-133 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: fir. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
This Information liotice 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.
flo specific action or response is requested at this time.
If further !1RC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding the matter, please contact the Director of the appropriate liRC Regional Office.
Sincerely,
/
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i En Director 2288 238
Enclosure:
IE Information (totice flo. 79-13 cc w/ enclosures:
W. Barr, PG&E W. A. Raymond, PG&E R. Ramsay, PG&E (Diablo Canyon)
J. D. Worthington, PG&E E. Weeks, PGSE (Humboldt Bay) 7 9 0 6 20 0 05L
U:llTED STATES liUCLEAR REGULATORY COMMISSIO!!
0FFICE OF I!!SPECTIO!! A!1D EllFORCEMEili WASHI!iGT0?!, D.C.
20555 May 29, 1979 IE Inforration flotice lio. 79-13 INDICATI0;l OF LO!! WATER LEVEL IN THE OYSTER CREEK REACTOR Summary A loss of feedwater transient at the Oyster Creek facility on flay 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 stcan 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 i.1ade critical May 3,1969.
Status Before Transient _
Operating at near full power with the main parameters at levels as follows:
1895 tiWt power level 79" Yarway (13'4" over top of fuel) reactor water level i
1020p5grectorpressure 7.1x10 #/hr feed flow 4
14.8x10 gpm recirculation flow rate (4 pumps) 12 psid corea p 2288 239 Equipment Out of Service (005)
"D" recirc pump 005 due to s "B" startup transformer 005 DUPLICATE DOCUMENT Entire document previously entered into system under:
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