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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         - - - - .                               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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3J 31 LZJ@ Ji L_%@ 36 38 el 42 43 as 4; cAust cesomeTicN ANc c nae: rive ActicNs @ lilal! During plant cooldown. makeup to the refueling water storaRe tank 1 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 Ii14 i!                                                                                                                _

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• T;nnass3 Velisy Authority 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. 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: N/A l O

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