ML20197G411

Submits Daily Highlights.Unit in Mode 2 at Less That 1% Power.Small Loss of RCS Inventory Noticed.Caused by Valve in CVCS Diverting Fluid to Liquid Hold Up Tank.Loss Terminated After Securing Valve

ML20197G411
Person / Time
Site:	Diablo Canyon
Issue date:	04/29/1984
From:	Schierling H Office of Nuclear Reactor Regulation
To:	Case E, Harold Denton, Edison G NRC
Shared Package
ML20197G068	List: IA-86-744, Submits Daily Highlight.On 860930,util Commenced Unloading Spent Fuel from Unit 1 Into Original Racks,Reinstalled Into Unit 1 Pool.On 861001,fuel Assembly Element in Reactor Vessel Tipped Into Unloaded Assemblies.No Fuel Damage ML20197G063 ML20197G272 ML20197G348 ML20197G378 ML20197G383 ML20197G406 ML20197G411 ML20197H807 ML20197J383 ML20197J432 ML20198G046 ML20210U819 ML20211H655 ML20211N838 ML20214N656 ML20215D091 ML20215N496
References
FOIA-86-744 NUDOCS 8405180029
Download: ML20197G411 (1)

Text

. - _ _ - _ _ _ _ _ _.

DISTRIBUTION Dockst File 50-275/323 E91964 PRC System Docket Nos.: 50-275 and 50-323 LB#3 Reading JLee HSchierling Attorney, OELD MEMORANDUM FOR:

H. R. Denton E. G. Case G. Edison D. Eisenhut R. Purple H. Thompson R. Vollmer R. Mattson

~ ~ '

T. Spets J. Taylor G. Holohan T. Novak G. Lainas F. Miraglia THRU:

George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing FROM:

Hans Schierling, Project Manager Licensing Branch No. 3 Division of Licensing

SUBJECT:

DAILY HIGHLIGHT DIABLO CANYON Diablo Canyon Unit I went critical early Sunday Mor.ning (12:07 am).

The unit is currently in Operational. Mode 2 at less than 1 percent power.

Zero power physics testsare being conducted. A small loss of RCS inventory (about 1 gpm) was noticed early Sunday morning.

The cause was that a valve in the CVCS diverted fluid to the liquid hold up tank. After securing the valve the loss was tenninated. The licensee, in accordance with Tech. Spec. requirements, declared an unusual event, which was cancelled shortly thereaf ter.

4 N[

Ha ns Schierling, PMject Manager Licensing Branch No. 3 Division of Licensing cc:

S. Black DL BC's

~

^ nock 05000__

i

-.