ML20147E408
| ML20147E408 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/02/1988 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8803070055 | |
| Download: ML20147E408 (4) | |
Text
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s TENNESSEE VALLEY AUTHORITY
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j; CH ATTANOOGA. TENNESSEE 37401 5N 105B Lookout Place MAR 021988 U.S. Nuclear Regulatory Commission ATTN: Docv.nent Control Desk Washinstr'a, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos.
50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - INTEGRATED DESIGN INSPECTION (IDI) - NRC INSPECTION REPORT 50-327/87-48 AND 50-328/87-48 provides TVA's supplemental response to IDI item D3.4-3. provides a list of commitments being made by TVA in this submittal.
It is our understanding: that the revised response provided herein complates TVA's actions on this item for unit 2 restart.
If you have any questions, please telephone D. L. Williams at (615) 632-7170.
Very truly yours, TENNESSEE VALLEY AUTHORITY
. J.
y, Deputy rector Nucid r Licensin and Regulatory A airs Enclosures cc: See page 2 8803070055 880302 PDR ADOCK 05000327 1
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.._DCD An Equal Opportunity Employer w
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i U.S. Nuclear Regulatory Commission hiAR 2 1988
'l Enclosure cc (Enclosure):
Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects Division
.U.S. Nuclear Regulatory Commission Region II 101 Marietta' Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. C. G. Zech, Assistant Director for Projects TVA Projects Division U.S.. Nuclear Regulatory-Commission One White Flint, North 11555 Rockville' Pike Rockville, Maryland 20852 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379
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ENCLOSURE 1 SEQUOYAH NUCLEAR PLANT SUPPLEMENTAL RESPONSE TO IDI ITEM D3.4-3 ITEM No.:
D3.4-3 TITLE: CCW Heat Exchanger Calculation
SUMMARY
OF ITEM:
The drawings provided by the vendor of three component cooling water (CCW) heat exchangers indicated that each had two saddles, one at each end.
The seismic qualification of the heat exchangers was provided by the vendor based upon this configuration.
The NRC observed from a field walkdown that the as-built condition for each CCW heat exchanger includes a middle support (i.e., three saddles each).
CLASSIFICATION:
Documentation SUPPLEMENTAL RESPONSE:
Discussions were held with NRC during the follow-up inspections in Knoxville,
-s Tennessee, the week of February 15, 1988.
Except for the middle CCW heat exchanger supports, no signif,1 cant as-built configuration discrepancies were identified. The NRC reviewed with TVA and Stone and Webster Engineering Corporation (SWEC) calculations which indicate structural adequacy of the heat exchangers and their supports and anchorages. The NRC questioned several items related to the SWEC calculational review and their evaluation of affected middle supports and supporting slabs.
As a result, TVA commits to the following actions after SQN unit 2 restart:
1.
TVA will revise the current floor slab calculaticns affected by CCW heat exchanger middle supports to include the latest loading information.
2.
TVA will develop and implement a periodic inspection program for the unreinforced middle piers of the component cooling water heat exchangers to ensure that_ttua concrete has not cracked. Acceptance criteria will be included in the inspection procedure.
3.
SWEC will perform additional review for technical accuracy of the heat exchanger support calculations prepared for TVA.
4.
TVA's Engineering Assurance (EA) organization will perform a technical adequacy review of the heat exchanger support calculations performed for TVA by SWEC.
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ENCLOSURE 2 SEQUOYAH NUCLEAR PLANT LIST OF C0KMITHENTS D3.4-3 1.
After SQN unit 2 restart, TVA will revise the current floor slab calculations affected by CCW heat exchanger middle supports to include the latest loading information.
2.
After SQN unit 2 restart, TVA will develop and implement a periodic inspection program for the unreinforced middle piers of the component cooling water heat excha: gers to ensure the concrete has not cracked.
Acceptance criteria will be included in the inspection procedure.
3.
After SQN 2 restart, SWEC will perform additional review for technical accuracy of the heat exchanger support calculations' prepared for TVA.
4.
After SQN unit 2 restart. TVA's Engineering Assurance (EA) organization will perform 'a technical adequacy review of the heat exchanger support calculations performed for TVA by (SWEC).
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