ML20055D846

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Forwards WCAP-10962,Rev 1, Zion Units 1 & 2 Reactor Vessel Fluence & Ref Temp for PTS Evaluations
ML20055D846
Person / Time
Site: Zion  File:ZionSolutions icon.png
Issue date: 06/24/1990
From: Chrzanowski R
COMMONWEALTH EDISON CO.
To: Murley T
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
Shared Package
ML20055D847 List:
References
NUDOCS 9007100081
Download: ML20055D846 (1)


Text

. -.

O CommonwealthEdison i

Zion Genwatigtetion g g m e m en Telephone 708 / 746 2084 June 24, 1990 j

Dr.-Thomas E. Murley, Director J

Office =of Nuclear Reactor Regulation V. S. Nuclear Regulatory Commission i

Hashington, DC 20555 Attn.

Document Control Desk j

Subject:

Zion Station Units 1 and 2 Pressurized Thermal Shock Submittal NRC Docket Nos. 50-295 and 50-304

Reference:

(a) March 23, 1990,- letter from R. A. Chrzanowski to T. E. Murley j

'l

Dear Dr. Murley:

1 In reference (a), Commonwealth Edison informed the Staff that the

-Zion Station Pressurized Thermal Shock' submittal would be revised.

This letter provides the enclosed report titled " Zion Units 1 and 2' Reactor Vessel Fluence and RT-PTS Evaluations", HCAP-10962, Revision 1. 'The report revision was.necessary due to the following reasons:

inconsistencies in the reactor vessel-beltline weld

' locations (as' discussed in reference a) new neutron exposure data from the Zion-surveillance =

capsule and ex-vessel dosimetry programs that changed the projected neutron fluence and reference ~ temperature for PTS

}

(RTPTS) values RTPTS values presented in the enclo:ure utilize the NRC accepted chemistry values'of.35 wt. % Cu' and.59 wt % Ni for the limiting Zion reactor vessel welds 1

1:

Please review the acceptability of the information' contained in the i

enclosed report to permit Commonwealth Edison to utilize this updated.

f,

.information in the Construction Permit to Operating License recapture submittal ~. This submittal is planned to follow the next Zion Unit 1_ refueling outage currently scheduled to begin September 1991.

Please direct any questions regarding this matter to this' office.

Very truly yours t

900710008

[9,

R.p[.Chrzanowsi I

PDR ADOC PDC P

Nuclear Licensing Administrator cc:

Zion Resident Inspector C. Patel - NRR

,pA k Region III Office

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