ML20236V961

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Corrected TS Bases Pages 3.5-30b of 961211 & 3.16-2 of 970205,correcting Amend Numbers
ML20236V961
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 07/27/1998
From:
DUKE POWER CO.
To:
Shared Package
ML20236V959 List:
References
NUDOCS 9808040312
Download: ML20236V961 (2)


Text

I i

l LOCA-Limited Maximum Allowable Linear Heat Rate For Mark-B10' Fuel Rods 20.0

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e 18.0 4 h

x 17.2

$ i e- 17.0

;17.0 17.0 g <

16.5

$ 16.0 a y 16.0 16.0 16.0 16.0 16.0 E  !

< 1

! -*- 25 GWd/mtU

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-*- 46.5 GWd/mtU .

  • 14.0 l -#- 57 GWd/mtU 12.3 12.3 12.3 12.3 12.3 12.0 . .

0 2 4 6 8 10 12 Arial Location of Peak Power From Bottom of Core, ft. .

  • FAark-810 fuel rods with a fuel pellet diameter of 0.3735 inches l are used in the Mark B10T fuel assemblies. ... .

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Oconee Nuclear Station )

Figure 3.5.2-16e .

l l 9800040312 980727 . .

Bases Revision 1

PDR ADOCK 05000269 - j 12/11/96

.j

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6 3.16.3 Components in the Containment Hydrogen Control Systems' flow path shall be operable on each Oconee unit with the following exceptions.

a. If the flow path is inoperable it shall be restored to operable status within 7 days.

m

b. If an inoperable flow path is not restored to operable status within 7 days.

then the affected unit shall be at 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 at cold shutdown within an additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.'"

Bases-The Containment Hydrogen Control Systems are required at approximately 7 days following a LOCA to limit hydrogen concentration to 4.0 percent by volume.

The Containment Hydroger. Recombiner System is utilized as the primary method to maintain the post-accident containment atmosphere hydrogen concentration below its lower flammability limit of 4.0 percent by volume. The Containment Hydrogen Recombiner System includes a g portable hydrogen recombiner which will be moved to the affected unit following a LOCA, anchored to its foundation, and connected to piping penetrations. Also included is a portable control panel, which will be locally mounted near the recombiner, anchored to its foundation and connected to its motor control center and the recombiner.

Even though the Reactor Building Hydrogen Purge System (RBHPS) is credited in this specification as an acceptable backup hydrogen control method to the Containment Hydrogen

. Recombiner System (CHRS), conservatively calculated dose rates around the purge /fiker make operation of the system during a design basis accident impractical. For this reason, credit will not be taken for the RBHPS as the backup hydrogen control method.

. . j 1

i Reference .

FSAR, Section 15.16 l I

to A one<ime allowable outage time of fourteen (14) days is granted for installation of a modi 5 cation to provide drainage for moisture which may acnimulate in the Containment Hydrogen Recombiner System piping.

3,16 -2 Bases Revision i Oconee 1, '2, and 3 -

2/5/97 m -- - - - - - - - _ _ _ _ _ _ _ _