05000280/LER-1981-016-03, /03L-0:on 810615,primary Sys Chloride Concentration Exceeded Tech Specs.Apparently Caused by Personnel Working on Minor Repairs to Closure Stud Hole on Reactor Vessel Flange.All Sources of Makeup Water Checked

/03L-0:on 810615,primary Sys Chloride Concentration Exceeded Tech Specs.Apparently Caused by Personnel Working on Minor Repairs to Closure Stud Hole on Reactor Vessel Flange.All Sources of Makeup Water Checked

ML20009C629
Person / Time
Site:	Surry
Issue date:	07/09/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C626	List: 05000280/LER-1981-016-03, /03L-0:on 810615,primary Sys Chloride Concentration Exceeded Tech Specs.Apparently Caused by Personnel Working on Minor Repairs to Closure Stud Hole on Reactor Vessel Flange.All Sources of Makeup Water Checked 05000280/LER-1981-038-03, /03L-0:on 810614,one Fuel Oil Flow Path to Emergency Diesel Generator Was Inoperable.Caused by Failed Control Transformer for Fuel Oil Pump EE-P-1C.Transformer, Burned Wiring & One SOV Replaced ML20009C625
References
LER-81-016-03L, LER-81-16-3L, NUDOCS 8107210294
Download: ML20009C629 (2)

LER-1981-016, /03L-0:on 810615,primary Sys Chloride Concentration Exceeded Tech Specs.Apparently Caused by Personnel Working on Minor Repairs to Closure Stud Hole on Reactor Vessel Flange.All Sources of Makeup Water Checked

Event date:
Report date:
2801981016R03 - NRC Website

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was reduced to less than 0.15 ppm as soon as possible. Therefore, the health and safety of the public were not affected.

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• ATTACHMENT 1 (PAGE 10F 1)

SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280 REPORT NO:

81-016/03L-0 EVENT DATE: 6-15-81 TITLE OF EVENT:

EXCESSIVE RCS CHLOR (DE CONCENTRATION 1.

DESCRIPTION OF EVENT

Between June 16, 1981 and June 21, 1981, with the unit in a refueling shutdown condition (less than 140 F), the primary system chloride concentration exceeded the allowable Tech. Spec. limit. The maximum chloride concentration was 0.53 ppm.

This is contrary to Tech. Spec. 3.1.F.4.b and is reportable per Tech. Spec.

6.6.2.b. (2).

2.

PROBABLE CONSEQUENCES:

When the event occurred, the Ieactor coolant system was already in a cold shut-down condition and partially drained witn the reactor vessel head removed. The reactor coolant system temperature was maintained less than 140 F and the chloride concentration was reduced to less than 0.15 ppm as soon as possible. Therefore, the health and safety of the public were not affected.'

3.

CAUSE

All possible sources of makeup water to the reactor coolant system were checked for chlorides with negative results. The only work that was being performed that could have affected the water quality of the reactor coolant system was minor repairs to a clo.sure stud hole on the reactor vessel flange. Therefore, it appears that personnel working on this repair activity contributer: to the increased chloride concentration 4.

Il@iEDIATE CORRECTIVE ACTION:

The imediate corrective action was to survey all possib'le makeup water sources for chlorides and to expedite on-going maintenance on the RCS purification system (CVCS).

S.

SUBSEQUENT CORRECTIVE ACTION:

l After maintenance was completed, the chemical and volume control system, with a mixed bed demineralizer was returned to service. The chloride concentration was reduced to within Tech. Spec. limits in a very short period of time.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

This appears to be a random event and therefore no additional actions are deemen necessary.

7.

GENERIC IMPLICATIONS None l