ML20059G972
| ML20059G972 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 08/31/1990 |
| From: | ILLINOIS POWER CO. |
| To: | |
| Shared Package | |
| ML20059G574 | List: |
| References | |
| NUDOCS 9009140078 | |
| Download: ML20059G972 (4) | |
Text
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U-601726 Y
LS-89-020 Page 7 of to y
. CONTAINMENT SYSTEMS 3/4.6.5 fRYWELL POST-LOCA VACUUM RELIEF VALVES i
LIMITING C0 01 TION FOR OPERATION i
All drywell pont-LOCA vacuum relief valves shall be OPE 8ABLE and closed.'
]
3.6.5 APPLICABILITY: OPERATIONAL CON 0!TIONS 1, 2*, and 3.
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Jt LOCA vacu'm relief valve, inoperable for ening but i
e, Mh o OPERABL!
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With one,drywell 0;prestore the inoperable vacuum. relief val a.
known to be closed' e next status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> e,r be in at least HOT SHUT 00WN within l
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD %UT00VN w thin the_following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
i en, restoref d d M f @
neach Pc With'one rywe post-LOCA vacuupg n 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or biii iri at b.
vacuum te ief valvelto the closeFposition wi least HOT SHUTDOWN within the next 1R hours and in COLD SHU igaWec4 AlpcA7 the f 110 win 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
With@the pos tion indicator ofROPERABLE drywel a+ eau en elief v'alve5o be closeWint least.
c.-
valv noperablo,fverif vacuu
_ __ e -
Otherwise, be in at least HOT l
_p once per 24 hourts +i-*J_12 houtta within t o-
. lowing 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. rxejnevistens er sfcc. 3.pe,n _____._ ari ne.t dyr.Sabic.
l, SHUTOOWN within
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ext.,
%,r SURVEILLANCE REQUIREMENTS 4.6.5.Each drywell post-LOCA vacuum relief valve shall be:
Verified closed at least once par 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
a.
i b.
Demonstrated OPERABLE:
1.
At least once per 31 days byt a)
Cycling the vacutm relief valve through at least one complete cycle of full tri. vel.
Verifying the podtion indicator OPERABLE by observing expected l
b) valve movement dur*ng the cycling test.
2.
At least once per 18 months Sy:
Verifying the pressure cifferential req 0 ired to open the vacuum relief valve, from the closed position, to be 5,0.2 psid, and a)
I
- See Spe'cial Test _Exce tion 3.10.1.
vnWes may be. cpened on cAn '.rderm'.Wer*
W hp.eu perst-LDEivne.v.u,m reneh6'.$ under adm'in16tn6ve:. Contro Legy1q'ggi
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CLINTON - UNIT 1 3/4 6-63 l
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gg;89-020-Page 8 of 10 t
, CONTAINMENT SYSTEMS DRWELL POST-LOCA VACUUM RELIEF VALVES L'
1.
SURVEIL UNCE REQUIREMENTS (Continued) 4.6.5- (Coltinued) b)
Verifying the position indicator OPERA'BLE by perhormance of a-CHANNEL CALIBRATION.
i; b
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- x CLINTON - UNIT 1
~3/4 6-64 4
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U-601726 4
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LS-89-020
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Page'9 of 10 CONTAINMENT SYSTEMS t
L BASES i
3/4.6.5 DRYWELL POST-LOCA VACUUM RELIEF VALVES _ _ __ _
Anh*9ECn ' V i h EnkerQ+4)r e.
/
eT1 vacuum re ref~valverare FFoM e on e rywell to~pais sufficTent ities of gas from the containment to the drywe t prevent an excess negative pressure from developing in the drywell. INSERT l
i 3/4.6.6 SECONDARY CONTAINMENT
'The secondad containment completely encloses the primary containment, except for the upper personnel hatch.
It consists of the fuel building,. gas control boundary, and portions of the auxiliary building enclosed by the extension of the gas control boundary an.d the ECCS cubicles and areas as described in esAR Figure 6.2-132. ' The standbg gas treatment system (SGTS) is designed to achieve and maintain a negative 1/4 W.G. pressure within the secondary containment following a design basis accident.
This design provides for the capture within i
the secondary containment of the radioactive releases from the primary contain-ment, and their filtration before release to the atmosphere.
Establishing and maintaining a vacuum in the 3econdary containment with the standby gas treatment system once per 18 months, along with the surveillance of r
the doors, hatches, dampers, and valves, is adequate to ensure that there are no violations of the' integrity of the seondary containment.
The inleakage L
values are not verified in the surveillances since no credit for dilution was taken in the dose calculation. As noted however, adequate drawdown is 4
verified once per 18 months. The acceptance criteria specified in l
Figure 4.6,6.1-1 for the drawdown test is based on a computer model, verified E
by actual performance of drawdown tests, in which the drawdown time determined for accident conditions is adjusted to account for performance of the test during normal plant conditions.
The acceptance criteria indicated per Figure 4.6.6.1-1 is based on conditions corresponding to power operation L
(with the turbine building ventilation system in operation) and wind speeds less than or equal to 10 mph.' The acceptance criteria for plant conditions l
other than those assumed will be adjusted as necessary to reflect the conditions which exist during performance of the surveillance test.
Tho OPERABILITY of the standby gas treatment systems ensures that sufficien.
iotine removal capability will be available in the event of a LOCA.
The reduc-t tion, i. -..tainment iodine inventory reduces the resulting site boundary radia-tion doses associated with containment leakage. The operation of this system and resultant iodine removal capacity are consistent with the assumptions used in the LOCA analyses. Continuous operation of the system with the heaters OPERABLE for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> during each 31-day period is sufficient to reduce the buildup of moisture on the absorbers and HEPA filters.
3/4.6.7 ATHOSPHERE CONTROL l
The OPERABILITY of the systems required for the detection and control of hydrogen gas ensures that these systems will be available to maintain the hydrogen con-centration within the containment below its flammable limit during post-LOCA CLINTON - UNIT 1 B 3/4 6-8 Amendment No. 21
U.601726 4;
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LS 89 020
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L Page 10 of 10 l
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l Insert for carc B3/4 6 8 J
l Opening of drywell vacuum relief valves is also required to support operation of the dryvell-containment atmosphere mixing system. Two vacuum relief valves j
p in series are provided in each of four drywell penetrations.
The drywell vacuum relief penetrations must be closed in order tu prevent steam bypass of
)
the suppression pool in the event of a LDCA.
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