ML19318A957

LER 80-070/03L-0:on 800517,during Cooldown from Mode 3, Refueling Water Storage Tank Water Level Fell Below Required Limit.Caused by Failure to Initiate Early Makeup.Makeup Immediately Initiated

ML19318A957
Person / Time
Site:	Sequoyah
Issue date:	06/16/1980
From:	Record D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318A951	List: ML19318A950 ML19318A957
References
LER-80-070-03L, LER-80-70-3L, NUDOCS 8006240433
Download: ML19318A957 (2)

Text

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NRC FOR%t 068 U. S. PdVCLE AR REGULATORY COYYlSSIOf4 (7 77) LICEi45EE EVENT REPORT EXHIBIT A

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c0NinoLctccx:l l l l l l l@ (PLE A$E PRIN T C A TYPE ALL f:E QUIRED I?.FO R?.:ATICN) 8 6 l I,o I. i,l l TeuII s,..  !! sCm I tr ! pl 1 !@ul 010! In .10In i.

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Io I ,,""i":[[L_}@l 015 i Oi 01013 l 217 l@! 015 l 11 718 l 0!@l UI6 34 Ja l 116' I'8 06J l@ ~ aE*03r ,v t 7 e f.J 61  ;;a gra..s*354 J 63 l'e t97 0 ATE EVENT DESO: UPTION AND pao 9aSLT CONSEcvENCES h' In i 21 i During unit 1 cooldown from Mode 3. the refueline water st.grane tank / I

         - - - - .                               water level fel"l                       I below
                                                                                             ~ ~          reou' ired level while in Mode 4                                                    T.S.          3.1.2.6                    I 1o 4 3 ! l I

ini.it requires at least 370,000 gallons in the RWST. There is no danger to I in is j i the health and safety of the public. I l o i r, i 1 1 l o 17 I l

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• t i t i i 1 was no t initiated early enough to prevent the RWST level from dropping i rT1I below T.S. limits. Upon discovery, makeup to RWST immediately initiated.t

                           ,,,,,; Operators reinstructed on Tech. Spec. requirements.                                                                                                                                                t

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l11 r i 1!@l a 3 eu N/A 1 63 IffI!IIiI r, J ' NA t os antPAmn Daniel J. Record ,me,y t . 615-842-5208 800624

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• Sequoyah Nuclear Plant LER SUPPLEMENTAL INFORMATION SQRO-50-327/ 8070 Technical Specification Involved 3.1.2.6 Reported Under Technical Saecification 6.9.1.13.b Late of Occurrence: -5/17/80 0450 CDST Identification and Description of Occurrence:

During unit 1 cooldown from Mode 3, RWST level fell below required water level while still in Mode 4. Conditions Prior to Occurrence: Unit 1 in Mode 3 Apparent Cause of Occurrence: The de=and on RWST water due to RCS shrink and pressurizer level was underestimated during unit 1 cooldown and makeup not started in time to maintain RWST level.

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Analysis of Occurrence: There was no danger to public health and safety. Corrective Action: Cooldown was continued to Mode 5 (where required level is only 35,443 gallons) while . continuously making up to the RWST. Failure Data:

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