ML20070L077

Proposed Tech Specs for Licenses DPR-77 & DPR-79 Re Surveillance Requirements for Emergency Gas Treatment Sys Cleanup Subsystems.Justification to Support Changes Encl

ML20070L077
Person / Time
Site:	Sequoyah
Issue date:	12/23/1982
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20070L076	List: ML20070L072 ML20070L077
References
NUDOCS 8212300359
Download: ML20070L077 (4)

Text

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ENCLOSURT*1 1

PROPOSED TECHNICAL SPECIFICATIONS FOR SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 i

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e b CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) ,.

c. After every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal adsorber operation by verifying within 31 days after removal that a laboratory analysis of representa-tive carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52, Kevision 2, March 1978, meets the Regulatory Guide 1.52, Revision 2, March 1978.

d. At laast once per 18 months by:

1. Verifying that the pressure drop across the combined HEPA filters and charcoal adsorber banks is less than 8 inches Water Gauge while operating the filter train at a flow rate of 4000 cfm 1 10%.

2. Verifying that the filter train starts on a Phase A containment isolation Test Signal.

3. Verify the operation of the filter cooling bypass valves.

4. Verifying that the heaters dissipate 1611.6 kw when tested in accordance with ANSI N510-1975.

5.' Verifying that each subsystem produces from atmospheric pressure a pressure in the annulus equal to or.more negative than minus 0.5 inches water gage relative to the outside atmosphere within one minute.

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e. After each complete or partial replacement of a HEPA filter bank by verifying that the HEPA filter banks remove greater than or equal to 99.95% of the DOP when they are tested in place in accordance with ANSI N510-1975 while operating the system at a flow rate of e 4000 ct.a 1 10%.

f. After each complete or partial replacement of a charcoal adsorber bank by verifying that the charcoal adsorbers remove greater than or equal tc 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in place in accordance with ANSI N510-1975 -

while operating the system at a flow rate of 4000 cfm 1 10%.

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l SEQUOYAH - UNIT 1 f 3/4 6-14 '-

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CONTAINMENT SYSTEMS

, SURVEILLANCE REQUIREMENTS (Continued) ..

c. After every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal adsorber operation by verifying within 31 days after removal that a laboratory analysi: of representa-tive carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52, Revision 2, March 1978, meets the Regulatory Guide 1.52, Revision 2, March 1978. ,

d. At least once per 18 months by:

1. Verifying that the pressure drop across the combined HEPA filters and charcoal adcorber banks is less than 8 inches Water Gauge while operating the filter train at a flow rate of 4000 cfm i 10%.

2. Verifying that the filter train starts on a Phase A containment isolation Test Signal.

3. Verify the operation of the filter cooling bypass valves. ,

' 4. Verifying that the heaters dissipate 1611.6 kw when tested in accordance with ANSI N510-1975.

5.' Verifying that each subsystem produces from atmospheric pressure a pressure in the annulus equal to or. more negative than minus 0.5 inches water gage relative to the outside atmosphere within one minc- l

e. After each comp 1'ete or partial replacement of a HEPA filter bank by verifying that the HEPA filter banks remove greater than or equal to 99.95% of the 00P when they are tested in-place in accordance with ANSI N510-1975 while operating the system at a flow rate of 4000 cfm i 10%.

f. After each complete oi partial replacement of a charcoal adsorber- '

bank by verifying that the charcoal adsorbers remove greater than'or equal to 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in place in accordance with ANSI N510-1975 /_

while operating the system e.t a flow rate of 4000 cfm i 10%.

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, SEQUOYAH - UNIT 2 . 3/4 6-14

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. o ENCLOSURE 2 SEQUOYAH NUCLEAR PLANT JUSTIFIC%TIO:I FOR PROPOSED TECHNICAL SPECIFICTION The present limit of 125 cfm in annulus inleakage cannot be met.

Extensive testing has been conducted during the last two weeks with no success in reducing the inleakage below 160 cfm. The present Sequoyah technical specifiention is more restrictive than the current revision of Westinghouse Standard Technical Specification (STS) issued by NRC. TVA proposes to adopt the presently accepted industry standard test as listed in the Westinghouse STS. Once per 18 months each Emergency Gas Treatment System cleanup subsystem will be tested to demonstrate that it can produce a pressure in the annulus equal to or more negative than minus 0.5 inches of water relative to the outside atmosphere within one minute when started at atmospheric conditions. TVA will ensure that operation in this mode, with this change, will have an insignificant impact on offsite dose levels.

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