ML20023B805

LER 83-033/03L-0:on 830402,during Hot Shutdown,Radwaste Effluent Monitor Declared Inoperable.Caused by High Fixed Level of Background Radiation.Liquid Radwaste PRM Inner Chamber Coated W/Acrylic Resin to Prevent Radiation Buildup

ML20023B805
Person / Time
Site:	LaSalle
Issue date:	04/28/1983
From:	Arand J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20023B801	List: ML20023B800 ML20023B805
References
LER-83-033-03L, LER-83-33-3L, NUDOCS 8305060401
Download: ML20023B805 (2)

Text

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RE?QRT DATE 8 to S1 00CKET N6M8ER EVENT DESCRIPTION AND PRC8ABLE CCNSECUENCES O'o

,a4:, l On April 2,1983, wi th Uni t- One in hot shutdown, the radwaste effluent monitor was  ;

declared inoperable. Since the Rad / Chem department was double sampling each batch g

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• 36 33 40 44 41 44 47 33 34 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 li t o g l The cause of the PR,41 inoperable status was due to a high fixed level of background g

The liquid radwaste PRM's inner chamber surface was coated with an  ;

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g g ; acrylic resin, experimentally, to determine if the buildup in the level of background T'he liquid radwaste PRM was returned to service and is j

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NAME OF PREPARER

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l. LER NUMBER: 83-033/03L-0

11. LASALLE COUNTY STATION: Unit i lli. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

4 4 On April 2,1983, with Unit One in hot shutdown, the radwaste effluent monitor was declared inoperable.

'V.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

Since the Rad / Chem Department took two independent samples and performed two independent release rate calculations in accordance wi th T.S. 3.3.7.10 for each batch discharged, the concentration of radioactive material released f rom the site was limited to the concentrations specified in 10CFR20, Appendix B, Table 11, Column 2 Therefore, the health and safety of the public was not affected.

VI. CAUSE:

! The liquid radwaste effluent PRM was declared inoperable because an accept-able source check could not be perforned due to a relatively high level l of contamination on the chamber surface. LER 83-033/03L-0 was cau' sed by' the .same problem.

Vll. CORRECTIVE ACTION:

The liquid radwaste PRM Inner chamber surface was coated with an acrylic  !

resin, experimentally, to determine if the bulldup of contamination could be prevented. The liquid radwaste PRM was returned to service and is presently functioning properly.

Prepared by: John Arand 3

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