ML20052A456

LER 82-023/03L-0:on 820312,after Filling & Venting of RCS, Sample Indicated Boron Concentration at 1,025 Ppm.Caused by Procedural Deficiency Due to Operating Boric Acid Blender W/O Concentration Verification During Addition to RCS

ML20052A456
Person / Time
Site:	McGuire
Issue date:	04/08/1982
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052A449	List: ML20052A448 ML20052A456
References
LER-82-023-03L, LER-82-23-3L, NUDOCS 8204280346
Download: ML20052A456 (1)

Text

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NRC POR84 3ss U. 3. NUCLEAR REGULATORY COemel5530M am LICENSEE EVENT REPCi'T EXHIBIT A CONTROL SLOCK: l l l l l l l (Pt. East PRwT ca TYPE Au. REQUIRED INFOf. - ATICM i .@

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CONT o 1 I O E l Ll@l 88 01Gl 510l 0l Of 3l 6l 9@l880 I8831 1l oocust soumeam 2 l 8 l 2 @l0 l 4 lREPCAr EVENr QATR 74 75 0 l 81QATS 81 2l@ 80 EVENT DESCRIPTION ANO PMoe ASLE CONSEQUENCES h ITITI lAf ter filling and venting of the Reactor Coolant (NC) System, a sample indicated g r;usi lthe NC System boron concentration was 1025 ppm. The system was declared below l

g lthe required shutdown margin (1030 ppm) for cold shutdown per T.S.3.1.1.2 which ;

G lis reportable per T.S.6.9.1.13(c). The 1% delta K/K shutdown margin provides prog A Itection to prevent inadvertant criticality with 1 inoperable control rod. If the,

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[Tl71 l concentration was slightly below the 1% shutdown margin with all rods operable, y l o is i Ithe reactor would remain subcritical due to a conservative safety margin. Health, 7 s edud SaleLy 01 Lhe puDile Were unallected. gg N C44mE Cause Coup. vatvg CCoS

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,, ,i, of of o i l p@ l N lg [ N lg l l 9 l 9 l 9lg CAuse OesCA PtiON ANO CORRECnVE ACTICMS h Li,Lo.j IThis was the result of a procedural deficiency, due to the practice of operating, y lthe boric acid blender without concentration verification during large scale add [-

m ltions to the NC System. Immediate boration of the NC System a s implemented to g 3 [ restore the boron concentration above the required limit. Procedures will be  ;

g imodified to require verification of blender outlet concentration during large ,

i e g ay e NC System makeup, n as s,owea trams omensrans @ oiscoveny or envossCni,non @

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