ML20244B571

Submits Followup Info Re Leakage Testing Requirements Which May Apply to BWR 5/6 Standby Gas Treatment Sys,Per El Jordan 800724 Request.Info Should Be Transmitted to IE for Review & Action as Described

ML20244B571
Person / Time
Site:	LaSalle, 05000000
Issue date:	08/14/1980
From:	Reimann F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Spessard R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML16342B348	List: IA-87-121, Discusses Inservice Test Programs Re Full Stroke Exercising of Normally Closed Swing or Tilting Disk Check Valves Per 10CFR50.55a & Section XI of ASME Code ML20235B266 ML20235B268 ML20235B295 ML20235B304 ML20235B322 ML20235B406 ML20235B470 ML20235B514 ML20235B581 ML20235B613 ML20235B673 ML20235B768 ML20235B785 ML20235B799 ML20235B859 ML20235B877 ML20235B922 ML20235C007 ML20235C967 ML20235C970 ML20235D014 ML20235D041 ML20235D091 ML20235D157 ML20235D188 ML20235D233 ML20235D400 ML20235D433 ML20235D484 ML20235D532 ML20244B491 ML20244B568 ML20244B571 ML20244B913 ML20244B937 ML20244B941 ML20244B943 ML20244C126 ML20244C271 ML20244C361 ML20244C777 ML20244C785 ML20244C833 ML20244C935 ML20244C940 ML20244C986 ML20244D413 ML20244D552 ML20244D582 ... further results
References
FOIA-87-121 NUDOCS 8108280509
Download: ML20244B571 (1)

Text

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August 14, 1980 MEMORANDUM FOR: R. .L. Spassard, Chief, Projects Section 1 F. W. Reimann, Reactor Insped. tor j FROM:

SUBJECT:

TESTING. REQUIREMENTS FOR STANDBY GAS TREATMENT i

SYSTEMS (SGTS)

This memorandum is to supply the followup information requested by Mr. E. L. Jordan, DROI, IE, during our telephone conversation of July 24, 1980, regarding leakage testing requirements which may apply to BWR 5/6 SGTSystems, particularly the system installed at the LaSalle County Station. l The leakage testing in question is testing to determine that a leakage flow path does not exist from the SGTS filter / absorber trains to the Reactor Building environment during periods of SGTS operation with a large burden of gas contaminated with radioisotopes. On earlier designs the fans which pro-vided motive force for treated gasses were located on the outlet side of their respective filter / absorber trains, resulting in a tendency for pressure within the filter / absorber housing to remain lower than the ambient turbine building atmospheric pressure. In the LaSalle County Station design (and other BWR 5 and 6 designs), the SGTS equipment is located in the reactor building,~and has the fans for each filter / absorber train located on the in-

.let side of each train. As a result of the relocation of the SGTS fans, the potential appears to exist for the leakage of radioactive contamination from the~ numerous access doors and filter seals in the filter / absorber trains to the Reactor Building during conditions of high airborne radioactivity in the containment and with the SGTS in service. A second condition of concern in-volves the potential for release of radioactive materials deposited on filter /

absorber train elements following a postulated fire caused by heat decay in the charcoal absorbers and subsequent initiation of the deluge system.

Because of the apparent potential for introduction of radioactive contamination into the Reactor Building via the SGTS, it is suggested that a requirement for

' preoperational leak rate testing of the SGTS be required following system in-sta11ation. It is also suggested that periodic inservice leak rate testing be required, plus testing following maintenance activities which could degrade the integrity of the SGTS.

There is currently no requirement to perform such testing in the FSAR for the LaSalle County Station. This matter was discussed with the licensee during IE Inspection 50-373/80-25, at which time the licensee stated that he would proceed with such testing only if a regulatory requirement is imposed which )

requires it.

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