ML20072R260

From kanterella
Jump to navigation Jump to search
Proposed Tech Spec 3.6.2.3 Re Drywell Air Locks
ML20072R260
Person / Time
Site: River Bend Entergy icon.png
Issue date: 03/12/1991
From:
GULF STATES UTILITIES CO.
To:
Shared Package
ML20072R257 List:
References
NUDOCS 9103220364
Download: ML20072R260 (2)
v • d • e


Text

. - - _ _ _ _ _ _ _ _ - - _ _ -_

f,. -. .*

C0'NTAINMENT SYSTEMS DRYWELL AIR LOCC LIMITING CONDITION FOR OPERATION 3.6.2.3 The drywell air lock shall be OPERABLE with:

a. Both doors closed except that, when the air lock is being used for normal transit entry and exit through the drywell, at least one air lock door shall be closed, and
b. An overall air lock leaksge rate of less than or equal to 11.85 scf per hour at 3.0 pcid, and
c. The inflatt.ble seal system air flask pressure 175 psig.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2*, and 3.

ACTION:

a. With one drywell air lock door inoperable paint:4n-+t4ean-the-05tEAASLE o :fr h:k- & r c h::d :nd ither r::ter: t..; in;per:t h ;ir hch d;;r te- '

b 5fd ,,A OPERASLE :t:te: within 24 5:;r: er h:h th: OPERASLE air h:x d;;r ch::d.

3 4per*h::y th n ;;ntinue ,;revid:d thet the OPCMOLC eir ha dee,- ie v: rift:d te be h:h:d c h ::d :t h::t : :: p:r 31 d:y:. Othe m!::, 5: 5 eHetet MOT 0!"JT00M4 within the tiext 12 hevr: end in COLO SM'J T0004 within 4.h: f:1h'iq 24 hann _

b. With the drywell air lcck inoperable, except as a result of an inoperable air lock door, maintain at least one air lock door closed; restore the inoperable air lock to OPERABLE status witnin 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT SHUTDOWN 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 COLD SHUTDOWN withir. the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
c. With one inoperable drywell air lock door inflat6 ole seal system air flask pressure instiumentation channel, restore the inoperable channel to OPERABLE status within 7 days or verify air flask pressure to be 175 psig at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

.w;

^$ee Special Te:t Exception 3.10.1. RECEIVED

    • The provisions of Specification 3.0.4 are not applicable.

SEP1Iinu 5DC 1

1 RIVER BEND - UNIT 1 3/4 6-20 Amendment No. 47 9103220364 910312

b q

g k 0 10 ,%

CONTAINMENT SYSTEMS

_JB SES 3/4.6.2.3 DRYWELL AIR LOCKS The. limitations on closure for the drywell air locks are required to meet

' the restrictions on Specifications DRYWELL 3.6.2.1 INTEGRITY and the drywell leakage rate given in and 3.6.2.2. The specification makes allowances for

',he fact that there may be long periods of time when the air locks will be in a closed-and secured position during reactor operation. Only one closed door in the air lock is required to maintain the integrity of the drywe11 4- INSERT 'B' l.

4

3/4.6.2.4 ORYWELL STRUCTURAL INTEGRITY This limitation ensures that the structural integrity of the drywell will '

be themaintained comparable to tne o.riginal design specification for the life of unit. A visual inspection in conjunction with Type A leakage tests is sufficient to demonstrate this capability. 1 3/4.6.2.5 DRYVELL INTERNAL PRESSURE The limitctions on drywell-to-containment differential pressure ensure ~

that, during LOCA conditions, the drywell peak pressure of 19.2 psid does not ,

exceed the design pressure of 25.0 psid and the containment peak pressure of 7.6 psig does not exceed the design pressure'of 15.0 psig. The maximum external drywell pressure differential is limited to 0.3 psid, well below the 0.58 psid at which drywall . suppression pool water will be forced over the wier wall and into the The limit offl.2 psid for initial positive drywell-to-containment differential pressure will limit the drywell pressure to 19.2 psid which is less than-the design pressure and is consistent with the safety snalysis.  ;

3/4.6.2;6 DRYWELL AVERAGE AIR TEMPF3[Tl!RE The limitation on drywell ave. age air temperature ensures that peak dry-well temperature does not exceed the design temperature of 330 *F during LOCA ,

conditions and is consistent with the safety analysis. J 3/4.6.2.7 ORYWELL VENT AND PURGE i

The 24-in. drywell purge supply and exhaust isolation valves are required  !

to be sealed closed during plant operation, since these valves have not been demonstrated capable of closing during a LOCA or steam line break accident. To '

provide assurance that the 24-inch valves cannot be opened inadvertently, they <

are se'aled closed in accordance with Standard Review Pikn Section 6.2.4 by methods that include fr/chanical_ devices to seal or lock the valve closed.or j prevent power from being supplied to the valve operator.

RIVER BEND - UNIT

  • B 3/4 6-4 l
Retrieved from "https://kanterella.com/w/index.php?title=ML20072R260&oldid=2817522"