Proposed New Spec 3/4.7.10 Re Limiting Condition for Operation & Surveillance Requirements for Noninterruptible Control Air SysML20006C119 |
Person / Time |
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Site: |
Fermi |
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Issue date: |
01/26/1990 |
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From: |
DETROIT EDISON CO. |
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Shared Package |
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ML20006C117 |
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References |
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NUDOCS 9002060339 |
Download: ML20006C119 (7) |
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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
- 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
- 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. ['
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.-
l
- 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 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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