PNO-III-80-113, on 800623,while Heating Up Plant for Initial Criticality,Inadvertent Actuation of Safety Injection Occurred.Caused by Manual Opening of Main Steam Isolation Valves.All Equipment Functioned as Expected

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PNO-III-80-113:on 800623,while Heating Up Plant for Initial Criticality,Inadvertent Actuation of Safety Injection Occurred.Caused by Manual Opening of Main Steam Isolation Valves.All Equipment Functioned as Expected
ML20148D740
Person / Time
Site: Sequoyah Tennessee Valley Authority icon.png
Issue date: 06/24/1980
From: Julian C, Robert Lewis
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-80-113, NUDOCS 8010090329
Download: ML20148D740 (1)
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, PRELIMINARY NOTIFICATION June 24, 1980 PRELTMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-80-ll3 This preliminary notification constitutes EARLY n_oti,c,e of an event of POSSIBLE

, safety or public interest significance. The information presented is as initially received without verifiesti.cn or evaluation and is basicallv all that is known by

~ ~ " " ~ ~

1E staff as of this date 1 FACILITY: Tennessee Valley Authority Sequoyah Unit No. 1 )

Docket No. 50-327 l Chattanooga, Tennessee SU17ECT: INADVERTENT SAFETY INJECTION ACTUATION While heating up the plant in anticipation of initial criticality, an inadvertent l

actuation of the safety injection systems occurred at 4:20 p.m.~5n~Jone 23. ine i plant initial conditions were: coolant tempetature 538'F, and reactor coolant system pressure of 1725 psig. The event was initiat.ad by the manufl opening of the main steam isolation valves, resulting in safety injection initiation from a high steam flow signal coincident with a low average reactor coolant system teary-ature. A'1 equipment functioned as expected. 5400 gallor.s of waBryere injected into the reactor vessel. The event was not anticipated as ; result of the valve opening and the licensee is investigating the cause.

i No media interest is anticipated. Neither TVA nur the NRC plans a press release.

The State of Tennessee has been infonned.

- t Region II (Atlanta) received notification of this occurrence Fy telephone from the i l

Senior Resident Inspector at 5:00 p.m. on June 23. This information is current as l' of 10:00 a.m. on June 24.

Contact:

C. Jullas, RII 24?-5571; R. C. Lewis, RII 242-5533 Distribution: Transmitted H. St. ___ _

Chairman Ahearne Commissioner Hendrie S. J. Chilk, SECY Commissioner Gilinsky Commis:.ioner Bradford C. C. Kassnerer, CA l

i Commissioner Kennedy ACP.T2 (For Distribution)

Transmitt.ed: MNBB_. ,_

P. Bldg. IE:X00S._ /?:Oc(IE:HQ Dist.)

W. J. Dircks, EDO ~

U. R. Denton, NRR C. Michelson, AEOD R. H. Vollmer, NRh I.andow J. J. Fouchard, PA (6 minjpnge)

R. J. Mattson, NRR J. J Cuacings, OIA N. M. Haller, MPA D. F. Ross, NRR R. G. Ryan, SP D. Eisenhut, NRR MAIL i

I H. K. Shapar, ELD S. H. Hansuer, NRR R. Minogue, SD IE:XOOS l Willste Document Mgt. Br. (For PDR, '

Applicable Resident Site Regional Offices J. G. DaT2 D iiSS R. J. Budnitz, RES PRELIMINARY NOTIFICATION 3010 0 0 03M

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