ML20092E274

Revised TS Change 95-15 for Amend to License DPR-77,revising TS Surveillance Requirements & Bases to Incorporate Alternate S/G Tube Plugging Criteria at Tube Support Plate Intersections,Per GL 95-05

ML20092E274
Person / Time
Site:	Sequoyah
Issue date:	09/07/1995
From:	Shell R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20092E278	List: ML20092E274 ML20092E283
References
GL-95-05, GL-95-5, TVA-SQN-TS-15, NUDOCS 9509150137
Download: ML20092E274 (3)

Text

'A i

1 nn  !

l Tennesseo VaHey Aulnordy Post Office Box 2000. Soddy-Daisy Tennessee 37379 September 7,1995  ;

TVA SON-TS-95-15, Revision 1 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

In the Matter of ) Docket No. 50-327 Tennessee Valley Authority )

SEQUOYAH NUCLEAR PLANT (SON) - TECHNICAL SPECIFICATION (TS)

CHANGE 9515, REVISION 1, " ALTERNATE PLUGGING CRITERIA FOR STEAM GENERATOR (S/G) TUBING - UNIT 1"

Reference:

TVA letter to NRC dated July 19,1995, "Sequoyah Nuclear Plant (SON) -

Technical Specification (TS) Change 95-15,' Alternate Plugging Criteria for Steam Generator (S/G) Tubing - Units 1 and 2'"

in accordance with 10 CFR 60,90 we are enclosing a requested amendment to License DPR-77 to change the TSs of SON Unit 1. The proposed change revises TS surveillance requirements and bases to incorporate alternate S/G tube plugging criteria at tube support plate (TSP) intersections. The approach follows the guidance given in the Generic Letter (GL) 95-05, " Voltage-Based Tubes Affected by Outside Diameter

, . Stress Corrosion Cracking," for alternate plugging criteria.

By the referenced letter, TVA submitted TS Change 95-15 for SON Units 1 and 2. l Subsequent to TVA's TS change request, NRC issued GL 95-05 that contained guidance for licensees who may wish to request a TS change for implementing alternate S/G tube repair criteria. On August 25, TVA held discussions with NRC staff concerning differences that existed between TVA's TS Change 95-15 submittal and NRC GL 95 05. Two specific differences involved S/G tube inspection of dented TSP intersections and probe wear. During a subsequent phone call with the NRC staff on August 28,1995, additional staff questions were discussed concerning Unit 1. TVA staff addressed the following topics:

1. TVA's inspection plan for dents.

2. Probe wear.

3. Tube pulls planned for the upcoming Unit 1 Cycle 7 refueling outage. p 9509150137 950907 PDR "

I\

ADOCK 05000327 '

P . . _.- - __PDR /

L U.S. Nuclear Regulatory Commission Page 2 September 7,1995 '

J 4.' Probe. variability.

- 5. Content of TVA's amendment request and conformance with GL 95 05.

6. Unit 2 applicability.

Following a discussion of the above topics, it was recognized that some of the differences between TVA's proposed TS Change 95-15 and GL 95-05 were generic

- industry issues that would not be resolved prior to SON's upcoming Unit 1 Cycle 7

_ refueling outage scheduled to begin September 9,1995. NRC recommended that TVA limit the proposed TS change to Unit 1'only and provide additional information on the topics discussed. Accordingly, TVA is submitting TS Change 9515, Revision 1 for. Unit 1 only and withdrawing the Unit 2 TS change request. ,

TVA is aware that probe wear is an unresolved industry issue. When a resolution of this issue is achieved, SON will utilize the NRC approved method. Until that time, SON willimplement the inspection / reinspection requirements of Enclosure 4 for one cycle of operation on Unit 1 (Cycle 8)..

In addition, TVA will follow the industry approach to probe variability. Enclosure 4 contains the description of SON's program for probe variability.

The proposed TS change is identified in Enclosure 1. The justification of the proposed

. TS change is provided in Enclosure 2. A TVA commitmentis provided in Enclosure 3.

The responses to CL 95-05 are provided in Enclosure 4. Additionalinformation requested during the August 28,1995, phone call is provided in Enclosure 5. Note that the information provided in Enclosure 5, Item 2, is representative of the dent distribution data.

Please note that the no significant hazard determination previously provided remains bounding for the proposed revision.

This change request is being reviewed by TVA's Nuclear Safety Review Board (NSRB) in parallel with NRC review. Any changes resulting from the NSRB review will ba L provided to NRC in a timely manner.

While S/G TSP tube degradation at SON is not expected to be significant, TVA is P submitting this TS change in advance of the upcoming Unit 1 Cycle 7 refueling outage to prevent an exigent request for alternate plugging criteria implementation. If a sufficiently high number of TSP outside diameter stress corrosion cracking indications are detected during SON's Unit 1 Cycle 7 refueling outage, use of the proposed

- alternate plugging criteria will be preferred. Therefore, NRC approval of this TS l change is requested before September 19,1995, to support the Unit 1 S/G tube i.

. inspection activities.

l V

.i i'

L U.S. Nuclear Regulatory Commission

. Page 3 _

September 7,1995 Please direct questions concerning this issue to D. V. Goodin at 843-7734. ,

1 Sincerely, h,'.

R. H. Shell Manager SON Site Licensing worn t and subscri ed efo me thi 7f day of e /w llAJ 995 HY1')

Nota 7y'P6blic Y )/ A'/20 Jid

/

[

My Commission Expires M[g/ /N&

Enclosures cc (Enclosures):

D. E. LaBarge, Project Manager Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike i Rockville, Maryland 20852-2739 Mr. Michael H. Mobley, Director (w/o Enclosures)

Division of Radiological Health 3rd Floor L & C Annex 401 Church Street Nashville, Tennessee 37243-1532 NRC Resident inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 4

Regional Administrator U.S. Nuclear Regulatory Commission Region ll 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711