ML20129D955

Ack Receipt of 960924 Fax from Licensee Requesting Meeting W/Nrc to Discuss Analysis & TS Changes in Support of Plant SG Tube Repair

ML20129D955
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/26/1996
From:	Alexion T NRC
To:	NRC
References
NUDOCS 9609300243
Download: ML20129D955 (3)

Text

,

s September 26, 1996 MEMORANDUM T0: PDIV-I File FROM: Tom Alexion

SUBJECT:

REQUEST FOR MEETING WITHNRC'TO DISCUSS ANALYSIS AND TECHNICAL SPECIFICATION CHANGES IN SUPPORT OF ANO-2 STEAM GENERATOR TUBE REPAIR I received the attached fax from the licensee.

Docket No. 50-368

Attachment:

Fax from Licensee l I

DISTRIBUTION:  !

Docket: File PUBLIC (PDR)

TAlexion D0C. NAME: AR2 FILE.NEM l

l gg {% Ok$' l l

i 4 13 y)0s 9609300243 960926 PDR ADOCK 05000368 P PDR

SEP 24 '% 11:52Ft1 ANO GSB LOBBY 2 I

j 4 I.

Meeting with NBC to Discuss Analysis and Technical SpeelAcetion Changes in

!- Support of ANO-2 Steam Generator Tube Repair d

! The ANO-2 steam generators have an active damage mechanism which requires extensive i repair of the steam generator tubing each inspection outage. Repairs are performed either

! by sleeving over the defect or plugging the defective tube. With each ropair the flow i resistance through the steam generator increases and if the tube is phinged RCS volume and heat tranafbr is reduced. Current analysis and technical specification limits support l

~

steam generator plugging up to 10%. The ANO-2 steam generston are currently 8 %

plugged (steam generator A at 9.2 and B at 6.8). It is anticipated that the 10 % plugging limit will be *=adad during 2R12 currently scheduled to begin on April 11,1997.

l i

j In anticipation of thture steam generator tube repair efforts, Mytr.: efforts were

! initiated soon after the last refheling outage These efforts have been extensive as the j impacts of additionaltube repair efforts beyond 10% will impact the analysis with respect to RCS flow, steam generator heat transfer area, steam generator conditions, RCS AT, l

i and RCS inventory. Several new methodologies were employed in this process as this j -

effort has touched on a gamut of analyses. Additionally, improved inethodologies have

~

been developed since some of the affected analyses havt last been reassessed The following are some of the new methodologies being applied by ANO:

1) All transient analyses are being assessed with CENTS rusher than CESEC-III.

2) CENTS has been used rather than COAST to determine RCP coastdown.

3) 1-D Hermite will be credited in the Loss of RCS flow event I

4) CENPD-137 Supplement 1-P-A will be used in the SBIACA analysis for up to f 15 % tube repairs.

5) CENPD 137 Supplement 2-P will be referenced for beyond 15 % tube repairs.

In light of the current ANO-2 steam generator status, the technical specifications associated with RCS flow and inventory and the analytical method used to determine the core operating limits as described in Section 6.9.5.1 of the ANO-2 technical specifications will require revision. A meeting is proposed to discuss the necessary Technical Specification changes, use ofnew methodologies, and timing of these events to ensure this effortis coordinated with theNRC.

Additionally, the' Cycle 13 core design is introducing Gadolinium as a burnable poison.

The core physics as a resuh of the new core design has resulted in the need to credit moderator void feedback in the MSLB analysis results. An approach of using 3 D Hermite credits, as has been done by WSES 3 and SONGS, will be used in the Cycle 13 MSLB analysis. This will be the first time ANO 2 will reference such an approach and willbe requesting NRC approval.

ATTACHMENT

SEP 24 '% 11:52AM ANO GS3 LOBBY P.1 i

ARXANSAS NUCLEAR ONE l 1448 S.R.333 ,

j RusselMlle. AR728010967 i *-ENTERGY m-i j .. .. ..

i TELECOPY REOUEST l SEND BY: September 24,1996 (DATEMME) l TO: Tom Alexion COMPANY or LOCATION: U.S. Nuclear Regulatory Commissica TELEPHONE NUMBER 301-415-1326 FACSIMILE (FAX) NUMBER: 301-415-3861 VERIFICATION NUMBER: 301-415 1302 l FROM: Dale E. James TELEPHONE NUMBER: 501-858-4619 LOCATION: ARKANSAS NUCLEAR ONE - GENERATION SUPPORT BUILDING - 1C OUR FAXNUMBER: 501-858-4685 OURVERIFICATIONNUMBER 501-858-5000 OUR MACHINE TYPE: RICOH FAX 3100L NUMBER OF PAGES INCLUDING COVER: 2 COMMENTS:

Tom attach'ed is the summary describlan the nurnose of the meeting with the Ranctor Systems arous, The meetina should be an Informal across the table information exchanas, I nronose the meetina take niace on 10/3/96 at 1:30 and last approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

l j