ML20059A616
| ML20059A616 | |
| Person / Time | |
|---|---|
| Site: | 05200001 |
| Issue date: | 10/22/1993 |
| From: | Fox J GENERAL ELECTRIC CO. |
| To: | Poslusny C Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9310270008 | |
| Download: ML20059A616 (3) | |
Text
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4 GENuclear Energy l'
GenevalElecvic Company 175 Curtner Avenue. San Jo:e. CA 961?S Octuber 22,1993 Docket No.52-001 Chet Poslusny, Senior Project Manager Standardization Project Directorate Associate Directorate for Advanced Reactors and License Renewal Office of the Nuclear Reactor Regulation
Subject:
Submittal Supporting Accelerated ABWR Schedule - Revision to SGTS Discussion Items
Dear Chet:
Enclosed are SSAR markups of Section 6.5 and Appendix 6A based on recent discussions with Plant Systems Branch. These pages replace the corresponding pages of my October 13, 1993 letter, Please provide copies of this transmittal to Jim Lyons and Janak Raval.
Sincerely, nbf Jack Fox Advanced Reactor Programs cc:
Alan Heard (GE)
Norman Fletcher (DOE)
Chandra Oza (GE)
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23A6100 Rev. 2
~ABWR Standard Safety Analysis Report the SGTS system is capable of performing its intended function in the event of LOCA.
A single train may be manually initiated for surveillance tesdng.
6.5.1.2.3.3 Decay Heat Removal Cooling of the SGTS filters may be required to prevent the gradual accumulation of decay heat in the charcoal. This heat is generated by the decay of radioactive iodine adsorbed on the SGTS charcoal. The charcoal is typically cooled by the air from the process fan.
A water deluge capability is also provided, but primarily for fire protection, since
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redundant process fans are provided for air cooling. Since the deluge is available,it may also be used to remove decay heat for sequences outside the nonnal design basis.
Temperature instrumentation is provided for control of the SGTS process and space electric heaters. This instrumentation may also be used by the operator to [re-] establish a cooling air flow post-accident, if required.
Water is supplied from the fire protection system and is connected to the SGTS via a spool piece.
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6.5.1.3.1 General c14*~ e e *dW af w u u m an u - e.
(1) A negative pressure of 6.35 mm water gauge is normally maintained in the secondary containment by the Reactor Building HVAC System secondary contain{ ment m'AC is automatically isolated.
(Subsection 9.4.5 On SGTS initiation (Subsection 6.5.1.2.3.1), tne (2) The SGTS filter particulate and charcoal efficiencies are outlined in Table 6.5-1. Dose analyses of events requiring SGTS operation (Subsections 15.6.5 and 15.7.4) indicate that offsite doses are within the limits established by 10CFR100.
(3) The SGTS is designated as an engineered safety feature (ESF) since it mitigates the consequences of a postulated accident by controlling and reducing the release of radioactivity to the emironment. The SGTS, except for the deluge, is designed and built to the requirements for Safety Class 3 equipment as defined in Section 3.2, and 10CFR50, Appendix B.
The SGTS has independent, redundant active trains. The two SGTS trains are mechanically and electrically separated. They are located in two side by side compartments (separated by rated fire barriers) adjacent to the HVAC system exhaust. Should any active train fail, SGTS functions can be performed by the i
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Fission Products Removal and Control Systems - Amendment 32 6.Sd
23A6100 Rev.1
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' Standard Safety Analysis Report (c)
"The system design should provide for permanent test probes with external connections in accordance with the provisions of Section 4.11 of ANSI N509-1976."
The design is in compliance with this position.
(d) "Each ESF atmosphere cleanup train should be operated at least 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> per month, with the heaters on (if so equipped), in order to reduce the buddup of moisture on the adsorhers and HEPA filters.'
he suncillance test requirements are provided in Technical Specification 3.6A.3 (Chapter 16). Each space heater, used only during SGTS 3
standby, contains a small circulating fan which serves to maintain the entire filter train at a uniform temperature. The filter train is physically isolated WY
-flu during system standby. Therefore, SGTS operation other than as required for mitigation of offsite dose is not required. The isolation of the filter train also pp^
serves to minimize the degradation of the liEPA filters and charcoal adsorber M
fM due to weathering effects between surveillance tests. This is further discussed -
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pe in Subsection 6.5.1.3.3, " Justification for Single SGTS Filter Train."
s (c)~ "The cleanup components (i.e., HEPA filters. prefilters, and adsorbers) 2m>"#
should not be inst;dled while active construction is sdll in progress."
installation of the SGTS will comply with this position.
(5) In Place Testing Criteria (a)
"A visual inspection of the ESF atmosphere cleanup system and all associated components should be made before each in place air flow distribution test, DOP test, or activated carbon adsorber section leak test in accordance with the provisions of Section 5 of ANSI N510-1975."
The system test procedures will comply with this position.
(b) "The air flow distribution to the HEPA filters and iodine adsorbers should be tested in place for uniformity initially and after maintenance afIecdng the flow distribution. No velocity reading shall exced 20% of the calculated average.The testing should be conducted in accordance with the provisions of Section 9 of *IndustrialVendladon"and Section 8 of ANSI N510-1975."
Acceptance tests, performed after completion ofinitial construction and after any system modifications or repair (per Table 1 of ANSI N510), will comply with this posidon.The guidance in " Testing ofVentilation Systems " Section 9 of " Industrial Vendlation."[ill be applied to any testing perform
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