ML20006E242

Forwards Final Rept, Reactor Vessel Matl Surveillance Program for Sequoyah Unit 2:Analysis of Capsule U. Measured Fluence Rates for Cycle 3 Approx 38% Lower than Fluence Rates Reported for Cycles 1 & 2

ML20006E242
Person / Time
Site:	Sequoyah
Issue date:	02/12/1990
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20006E243	List: ML20006E242
References
NUDOCS 9002220401
Download: ML20006E242 (3)

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TENNESSEE VALLEY AUTH'ORITY:

CH ATTANOOGA. TENNESSEE 37401 SN'1578 Lookout' Place-Qg i

LLS. Nuclear Regulatory Commission

-- ATTN : Document Control Desk Hashington,-D.C. '20555 i

Gentlemen:

m In;the Matter-of

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Docket No. 50-328 Tennessee Valley Authority SEQUOYAH NUCLEAR PLANT (SQN) UNIT.2 - ANALYSIS OF REACTOR VESSEL IRRADIATION.

CAPSULE U 1

Enclosed is the final report, prepared by Southwest Research Institute,-on-testing of :the subject reactor vessel specimen that was removed during the SQN UnitL2 Cycle 3 refueling outage.

The measured fluence rates for' Cycle 3 are approximately-38 percent ' lower than the fluence rates reported for Cycles 1 and= 2 because of the use of a low-leakage core configuration.

This report is being submitted in.accordance with Technical Specification 3/4.4.9 and-t

'l 10 CFR 50,. Appendix H.

'TVA has conducted a review of'the_ enclosed report and determined that the projected material toughness for operating through'32 effective full power

. years is-supported by the data.

Based on the test results, the SQN Unit 2 reactor vessel can be expected-to operate for its design life without exceeding material toughness criteria.

Please direct questions concerning this issue to Bruce S. Schofield at (615) 843-6172.

Very truly yours, TENNESSEE VALLEY AUTHORITY

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Manager, uclear Litehsing and Regulatory Affairs L

Enclosure cc:

See page 2 9002220401 900212 u

PDR ADDCK 05000328 P

PNU

/)d68 An Equal opportunity Employer

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O.S.[;Nucleat: Regulatory Commissioni cc (Enclosures):

Ms. S.!C.' Black, Assistant Director

,z for Projects TVA Projects Division.

U.S.LNuclear Regulatory Commission 1,1

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. One White Flint, North _-

cy 11555 Rockville Pike'

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Rockville,' Maryland ~ 20852

.Mr. B. A.-Wilson, Assistant Director

,i P W ifor~ Inspection Programs-

TVA Projects Division-U.S. Nuclear Regulatory Commission

.i RegionJII T

10leMarietta Street, NW, Suite 2900-LAtlanta, Georgia 30323 NRC Resident I'nspector-

'Sequoyah Nuclear Plant J

~2600 Igou Ferry _ Road.

~37379 Soddy. Daisy, Tennessee e

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. REACTOR' VESSEL MATERIAL SURVEILLANCE L.,

- PROGRAM FOR SEQUOYAH UNIT 2:. ANALYSIS

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