05000281/LER-1981-039-03, /03L-0:on 810623,periodic Testing Disclosed RWST Chloride Concentration Exceeded Limits.Caused by Leakage Through MOV-CS-202A & B from Chemical Addition Tank. MOV-CS-202B Isolated.Sensitized Piping Flushes Performed

/03L-0:on 810623,periodic Testing Disclosed RWST Chloride Concentration Exceeded Limits.Caused by Leakage Through MOV-CS-202A & B from Chemical Addition Tank. MOV-CS-202B Isolated.Sensitized Piping Flushes Performed

ML20009F886
Person / Time
Site:	Surry
Issue date:	07/23/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F883	List: 05000281/LER-1981-039, Forwards LER 81-039/03L-0 05000281/LER-1981-039-03, /03L-0:on 810623,periodic Testing Disclosed RWST Chloride Concentration Exceeded Limits.Caused by Leakage Through MOV-CS-202A & B from Chemical Addition Tank. MOV-CS-202B Isolated.Sensitized Piping Flushes Performed
References
LER-81-039-03L-02, LER-81-39-3L-2, NUDOCS 8108030137
Download: ML20009F886 (2)

LER-1981-039, /03L-0:on 810623,periodic Testing Disclosed RWST Chloride Concentration Exceeded Limits.Caused by Leakage Through MOV-CS-202A & B from Chemical Addition Tank. MOV-CS-202B Isolated.Sensitized Piping Flushes Performed

Event date:
Report date:
2811981039R03 - NRC Website

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ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO:

50-281 REPORT NO:

81-039/03L-0 EVENT DATE:

06-23-81 HIGH RWST CHLORIDE CONCENTRATION 1.

DESCRIPTION OF THE EVENT:

With Unit 2 operating at 100% steady state power, Period Test 18.1 dis-closed chloride concentrations greater than 0.15 ppm.

Subsequent investi-gation of these results showed the RWST to contain chloride concentrations in excess of.15 ppm.

Since the RWST is the water source for the contain-ment spray system and the low head safety injection system flushes, the basis for Technical Specification 4.1.F (flushing of sensitized piping) could not be met.

This is reportable per T.S.-6.6.2.b(2).

2.

PROBABLE CONSEQUENCES:

Chloride concentrations of less than 0.15 ppm are maintained to preclude the possibility of intergranular attack on stainless steel piping.

Communications with Westinghouse indicated that, given the conditions in the RWST, intra-granular attack was not likely to occur.

Flushing to prevent stagnation was continued on a regular basis. Therefore, the integrity of the affected systems was not compromised, and the health and safety of the public were not affected.

3

CAUSE

The source of chloride contamination of the RWST has been determined to be leakage through MOV-CS-202A and B from the Chemical Addition Tank.

4

IMMEDIATE CORRECTIVE ACTIONS

After determining the source of the contamination, leakage was reduced by isolating MOV-CS-202B.

5 SUBSEQUENT CORRECTIVE ACTIONS:

Consultations with corporate chemistry, Westinghouse, and ion exchange resin manufacturers culminated in a procedure which has been used to return the l

RWST chemistry to within allowable limits.

Sensitized piping flushes presently l

are being completed with satisfactory results as RWST temperature constraints permit.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

Maintenance Reports to repair the leaking MOV's have been written.

The valves are scheduled to be repaired during the snubber inspection outage scheduled for September, or at a prior outage of sufficient duration.

l 7.

GENERIC IMPLICATIONS:

None.