ML20006C119

Proposed New Spec 3/4.7.10 Re Limiting Condition for Operation & Surveillance Requirements for Noninterruptible Control Air Sys

ML20006C119
Person / Time
Site:	Fermi
Issue date:	01/26/1990
From:	DETROIT EDISON CO.
To:
Shared Package
ML20006C117	List: ML20006C119 NRC-89-0298, Application for Amend to License NPF-43,adding New Tech Spec 3/4.7.10 for Noninterruptible Control Air Sys to Prevent Unnecessary Plant Shutdowns in Event of Control Air Compressor Failure Which Requires Extensive Repairs
References
NUDOCS 9002060339
Download: ML20006C119 (7)

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PKPOSID NN SPECIFICATION 3/4.7.10

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PIANT SYSTEMS l

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- 3/4.7.10 NONINTERRIPTIBLE CONTRCL AIR SYSTEM LIMITIIC COf0ITION FOR TERTION ,

1 3.7.10 'No independent Noninterruptible Control Air- (NIAS) system -  ;

subsystems shall be TEmBLE with each subsystem _i

a. Consisting of one TERBLE Control Air Conpressor,  !

Aftercooler, associated Dehydration and Filter _ Units, ,

Air Receiver Tank, 'and associata3 control ' ,

instrumentation.

i Capable of autmatic isolation from nonsafety grade. air'

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APPLICABILITYr TERTIONAL CO!OITION 1, 2, > 3, 4, 5, and

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a. In TERTIORL CO!OITION 1, 2, or 3:

1. With one NIAS system subsystem inoperable due to an

inoperable Control Air Conpressor, Aftercooler, ,

associated Dehydration or Filter Unit, or

associated control instrumentation, cross-tie the-NIAS system subsystem to the T ERABLE NIAS system-subsyst m within one hour. Restore the inoperable  ;

NIAS system subsystem to TERABLE status within 30  :

days or be in at least HOT SHUfDOWN within.the'next ,

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COED SHUIDOWN within the following  !

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. If the two NIAS subsystems are '

cross-tied under the above provisions, then l conponents and systems which are supplied air by. i the NIAS system do not become -inoperable due to the i inoperability of the NIAS-systen subsystem. I

2. With one NIAS system subsystem otherwise increrable l or unable to be cross-tied uMer the provisions of ,

1) above ,

i Verify that the NIAS system subsystems are not l a) cross-tied within one hour. _;

• When irra31ated fuel is being han31ed in the secondary  ;

containment, during CORE ALTERTIONS, or during ' operations with the 'I potential for draining the reactor vessel.

b. Declare the affected Remote Shutdown Panel SRV controls (Division I only), Accident .

Monitoring Instrumentation (Drywell Hydrogen and Oxygen concentration, Drywell pressure,- i and Suppression Chanber pressure and water  ;

level),' Primary Containment Atmosphere Gaseous. l Radioactivity monitor (Division I only),' MSIV.- i Leakage Control System subsysts, Reactor  ;

Building - Suppression Chaber vacuum breaker  :'

isolation valve, Secondary containment L Railroad Bay Access Door, StaMby Gas -

Treatment Syste subsyste, and Control- Rom Emergency Filtration System conponents ,

inoperable and take the ACTIONS required. by -

Specifications 3.3.7.4, 3.3.7.5, 3.6.2.1, j

3. 4.3.1, 3.6.1. 4, 3.6.3, 3.6. 5.1, 3.6.5.3, aM 'i 3.7.2. ,

3. With both NIAS system subsystes inoperable, be in ,

I at least 10I' SHlHDOWN within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUIDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. i

l b. In TERATIOEL CONDITION 4, 5, or

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1. With one.NIAS system subsyste inoperable due to an inoperable Control Air Conpressor, Aftercooler, j asscciated Dehydration or Filter Unit, or s associated control instrumentation, cross-tie the NIAS system subsyste to the TERABLE NIAS system i l

subsystem'within one hour. If the two NIAS subsystems are cross-tied under the above- '

provisions, then conponents and systems which are supplied air by the NIAS system do not become  ;

inoperable due to the inoperability of the NIAS system subsystm.

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2. With NIAS otheIvise inoperable or with the.

subsystems unable to be cross-tied under the a provisions of 1) above, declare the StaMby Gas  !

Treatment subsystem (s), Control Room Emergency. ['

Filtration System conponent(s) and SecoMary Containment Railroad Bay Access Door (s) inoperable and take the ACTIONS required by Specifications 3.6.5.3, 3.7.2, and 3.6.5.1.-

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• When irradiated fuel is being handled in tre secondary j

r containment, during CORE ALTERTIONS, or during operations with the '

potential for draining the rezetor vessel.

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i SURVPTT.TAICE RWITIRl!MERPS  ;

4.7.10.1 The Noninterruptible Control Air Systen shall be denonstrate5 CPERABLE:

a. At least once per 31 days by verifying that the

,. cross-tie valves and each valve . (nanual, power-operata3 or automatic) required for proper operation.of the.

Control Air Coupressors, Aftercoolers, Filter and Dehydration Units, and associated control '

t instrumentation that is not locked, sealed, or otherwise '

secured in position, is in its correct position.

b. At least once per '18 nonths by verifying that each .

automatic valve which isolates the NIAS systen subsystem.

from nonsafety grade air systens actuates to its  ;

isolation position on each of the following autanatic :l actuation test signals:

1. Station Air Supply low pressure

2. NIAS Control Air header low pressure

3. Loss of offsite power

c. At least once per 18 nonths by verifying = that each I control Air Conpressor capacity is greater than or equal.

to 100 scfm.

d. At least once per 18 months by verifying that each "

Control Air Conpressor automatically starts on each of the following automatic actuation test signals:

1. NIAS' Control Air Header low pressure.

2. Loss of Coolant' Accident ' (Drywell' Pressure-High and/or Beactor Vessel Level-Low- <

Level 2).

3. Loss of offsite power i

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' 3/4.7 PLANT SYSTEMS 4 T BARPA 3/4.7.10 NONIhrumuPrmiR CONTML AIR SYSTEM

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The CPEIRBILIW of the noninterruptible-control air syste, which.

provides a safety grade. back up~. control air source, is required to ,

support the operation of safety-related equipment during normal and i accident conditions. If a Control Air Coupressor, Aftercooler,;  !

Dehydration / Filter Unit or associated control' instrumentation becomes

- inoperable, the two subsystems _ can be cross-tied and the control air requirements satisfied by a single compressor. Since a safety gra3e -

back up control air supply is available, components utilizing the NIAS "

are not made inoperable from the ACTION of cross-tieing the two - i subsystems. Studies using the Probabilistic Risk' Assessment methodology have shown that cross-tieing-the NIAS subsystems poses a i smaller risk than operation with no safety grade back up-control air i for- one division.

l If a noninterruptible control air syste subsystem becomes otherwise . l L inoperable, the NIAS subsystem cross-tie nust be closed to assure -

CPEPABILIW of the remaining NIAS subsystem and the associated (

safety-related equipment.. The ACTIONS specified in this situation' {

carry out the ACTIONS for the resulting inoperabilities due to the =  !

loss of control air to equipnent or instrument isolation valves.

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