ML20006C119

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Proposed New Spec 3/4.7.10 Re Limiting Condition for Operation & Surveillance Requirements for Noninterruptible Control Air Sys
ML20006C119
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 01/26/1990
From:
DETROIT EDISON CO.
To:
Shared Package
ML20006C117 List:
References
NUDOCS 9002060339
Download: ML20006C119 (7)
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PIANT SYSTEMS

- 3/4.7.10 NONINTERRIPTIBLE CONTRCL AIR SYSTEM I

LIMITIIC COf0ITION FOR TERTION 1

3.7.10

'No independent Noninterruptible Control Air- (NIAS) system -

subsystems shall be TEmBLE with each subsystem

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Consisting of one TERBLE Control Air Conpressor, Aftercooler, associated Dehydration and Filter _ Units, Air Receiver Tank, 'and associata3 control '

instrumentation.

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Capable of autmatic isolation from nonsafety grade. air' systems.

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

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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

l a)

Verify that the NIAS system subsystems are not 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 />.

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b.

In TERATIOEL CONDITION 4, 5, or

  • c 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.

I 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.

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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 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 At least once per 18 nonths by verifying = that each I

c.

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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PIKPOSED BASES i

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' 3/4.7 PLANT SYSTEMS T

4 BARPA 3/4.7.10 NONIhrumuPrmiR CONTML AIR SYSTEM 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.

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inoperable, the NIAS subsystem cross-tie nust be closed to assure -

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CPEPABILIW of the remaining NIAS subsystem and the associated safety-related equipment.. The ACTIONS specified in this situation'

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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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