ML20137S425

Proposed Tech Spec Changes to Reflect Design Features, Restricting Newfuel Vault Enrichment Limit to Match Spent Fuel Pool Limit of 3.7

ML20137S425
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	11/21/1985
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20137S421	List: ML20137S416 ML20137S425
References
NUDOCS 8512060238
Download: ML20137S425 (3)

Text

E k

ATTACHWNT PROPOSED ZION APPENDIX A TECHNICAL SPECIFICATION CHANTS T0 t- ,

SECTION 5.0 DESIGN FEATURES Pages Modified: 298 w

39 a

4 (Replace corresponding pages'in Attachment 1 of Reference (a))

0924K ,

!'d P

D DR e J

1 Th2 rcacter containment strrcture fer Zien Unit Th;ra are thrco secticns cf racks with sach .

2 essentially identical in design and section made up of two rows. The two parallel .

construction to that of Unit 1 except that it rows in each section have a nominal center to is reoriented. Numerous mechanical and center spacing of 21 inches and each section is electrical systems penetrate the containment separated by a distance of 44" to assure a K wall through welded steel penetrations.(2) effective of less than 0.95 even for a condition of optimum moderation if unborated 5.4.3 Containment Penetrations Sideways water was to fill the vault, for fuel having a maximum loading of 46.4 gas. U-235 per axial All containment penetrations (both electrical centimeter of fuel assembly length (about 3.7 and piping) are double barrier assemblies weight percent U-235). The new fuel storage consisting of a closed sleeve, in most cases, vault is protected from flooding by its free or a double gasketed closure for special flood drain, penetrations such as the fuel transfer tube.

The space between the double barriers will be New fuel may also be temporarily stored in the continuously pressurized, by the Penetration spent fuel pool in preparation for refueling.

Pressurization System, to a pressure in excess The fuel assemblies are stored in racks in of the containment design pressure. (*) parallel rows, having a nominal center to center distance of 10.35 inches in both References directions. This spacing is sufficient to maintain a K effective of less than .95 when (1) FSAR Section 5.1.1 flooded with unborated water, for fuel having a (2) FSAR Section 5.1.2 maximum loading of 46.4 gms. U-235 per axial (3) FSAR Section 5.1.4 centimeter of fuel assembly length (about 3.7 weight percent U-235).

5.5 Fuel Storage 5.5.2 Spent Fuel Storage 5.5.1 New Fuel Storage Irradiated fuel assemblies will be stored prior New fuel assemblies are stored in a to offsite shipmer.t in the stainless steel separate storage vault which is designed lined fuel pool which is located in the fuel to hold 132 new assemblies. The new fuel hanaling building. Borated water is used to storage racks accommodate 2/3 of a core. fill the spent fuel storage pit at a concentration to match that used in the reactor cavity and refueling canal during refueling operations. The fuel is stored in a vertical array with a nominal center to center spacing of 10.35" between assemblies to assure a K effective of less than 0.95 even if unborated

. water is used to fill the pit, for fuel having l a laaximum loading of 46.4 gas. U-235 per axial 09510/09520 298

3 5.5.2 Seent Fuel Storace fContinued) 5.6 Seismic Destin ].

l centimeter of fuel assembly length (about 3.7 The structuras, mechanical components and weight percent U-235). Engineered Safeguards Systems vital to safe shutdown and containment isolation, or whose peterence failure might cause or increase the severity of a loss of coolant accident, are designed per Criticality Analysts of Zion Units 1 and 2. Fresh and the seismic criteria of Design Basis Earthquake Spent Fuel Racks, dated October 25, 1984. (98E). Design Basis Earthquake is based on i ordinary allowable stresses as set forth in i

applicable codes, plus the additional requirement that a safe shutdown be made during a horizontal ground acceleration of 0.17g and a

~

i _

i vertical acceleration of 0.11g occurring 4 simultaneously. These systems and equipment are i defined as Seismic Class 1.

t other systems and mechanical components in a j support or auxiliary function are designed per the seismic criteria of Operational Basis l Earthquake (08E), or per applicable codes.

These systems and equipment are defined as j either Classes 2 or 3 depending on their function.

~

8 m . ,,

T 4

s -

~,

' ~~

l -

S ,

. i, N,

,, ,a -

J b~ ,

" ' ' *~

<_ q g* .

D e" /

q. c - ,

I -

j 09510/09520 299 i

e

,,. _. ., - - . -,