05000281/LER-1981-037-03, /03L-0:on 810608,NaOH Concentration of Cat Exceeded Tech Spec Limits.Cause Not Stated.Concentration Diluted & Personnel Will Be Reinstructed

/03L-0:on 810608,NaOH Concentration of Cat Exceeded Tech Spec Limits.Cause Not Stated.Concentration Diluted & Personnel Will Be Reinstructed

ML20009E822
Person / Time
Site:	Surry
Issue date:	07/17/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009E816	List: 05000281/LER-1981-037-03, /03L-0:on 810608,NaOH Concentration of Cat Exceeded Tech Spec Limits.Cause Not Stated.Concentration Diluted & Personnel Will Be Reinstructed 05000281/LER-1981-043-03, /03L-0:on 810617,in Preparation for Flushing of Sensitized Pipe,Valve 2-SI-73 Was Discovered Open.Cause Unknown.Valve Closed & Locked ML20009E814
References
LER-81-037-03L-02, LER-81-37-3L-2, NUDOCS 8107280467
Download: ML20009E822 (2)

LER-1981-037, /03L-0:on 810608,NaOH Concentration of Cat Exceeded Tech Spec Limits.Cause Not Stated.Concentration Diluted & Personnel Will Be Reinstructed

Event date:
Report date:
2811981037R03 - NRC Website

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(3i,i ; repcrrtable per T.S.-6.6.2.b(2). The CAT would have performed its intended f emc *4 ~ I jei3 i iodine removal, during a LOCA.

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DOCKET NO:

50-281 REPORT NO:

81-037/03L-0 EVENT DATE:

06-08-81 TITLE OF EVENT:

NaOH CONCENTRATION GREATER THAN 18%

1.

DESCRIPTION OF EVENT

Or June 8, 1981, with the unit at 100% power, a solution of NaOH was added to the RWST Chemical Addition Tank (CAT) in order to raise the operating level. A CAT sample analyzed af ter the addition indicated a Na0H concentration of 18.2%.

This is contrary to Tech. Spec. 3.4.2.A.4 and is reportable per Tech. Spec.

6.6.2.b(2).

2.

PROBABLE CONSEQUENCES:__

The CAT provides NaOH to the containment spray system to facilitate iodine removal in the containment atmosphere during LOCA. The CAT would have performed its intended function (Iodine removal), however, the containment sump would have a slightly elevated pH.

The health and safety of the public were not affected.

3.

CAUSE

The cause was personnel error. Percent volume instead of % weight was used to calculate the a=ount of NaOH to be added to the CAT.

4.

USEDIATE CORRECTIVE ACTION:

Primary Grade water was added to the CAT to dilute the contents. Samples after the dilution indicated a 17.7% NaOH concentration in the CAT.

5.

SUBSEQUENT CORRECTIVE ACTIONS:

None.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

Personnel involved will be instructed to use % weight to calculate NaOH additions.