ML20207Q247
| ML20207Q247 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/16/1987 |
| From: | Domer J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF ADMINISTRATION (ADM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8701270073 | |
| Download: ML20207Q247 (4) | |
Text
~e TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374o1 SN 157B Lookout Place 8AN16987 U.S. Nuclear Regulatory Conunission Attn: Document Control Desk Office of Nuclear Reactor Regulation Washington, D.C.
20555 Attention:
Dr. J. Nelson Grace In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 & 2 - MODIFICATIONS ASSOCIATED WITH DEVIATION REQUESTS - 10 CFR PART 50 APPENDIX R This letter provides the status of plant modifications associated with 10 CFR Part 50 Appendix R deviation requests which were approved by an NRC Safety Evaluation Report transmitted in B. J. Youngblood's letter to S. A. White dated May 29, 1986. Enclosure 1 provides the schedule for completion of the remaining modifications associated with the deviation requests. provides a list of conunitments contained in enclosure 1.
If you have any questions, please get in touch with M. R. Harding at (615) 870-6422.
l To the best of my knowledge, I declare the statements contained herein are complete and true.
Very truly yours, TENNESSEE VALLEY AUTHORITY
.Y J. A. Domer, Assistant Director Nuclear Safety and Licensing Enclosures cc: See page 2 i
I 8701270073 870116 PDR ADOCK 05000327 F
PDR g(
An Equal Opportunity Employer
.. BAN 161987 U. S. Nuclear Regulatory Commission cc (Enclosures):
Mr. J. J. Holonich Sequoyah Project Manager U.S. Nuclear Regulatory Commission 7920 Forfolk Avenue Bethesda, Maryland 20814 Director of Nuclear Reactor Regulation-Attn:
Mr. B. J. Youngblood, Project Director PWR Project Directorate No. 4 Division of Pressurized Water Reactors Licensing A U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. G. Zech, Director TVA Projects U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant P.O. Box 2000 Soddy Daisy, Tennessee 37319 I
k ENCLOSURE 1 B. J. Youngblood's May 29, 1986 letter to S. A. White transmitted the results of an NRC safety evaluation which approved 20 deviation requests for Sequoyah Nuclear Plant's 10 CFR Part 50 Appendix R program. Additionally, the safety evaluation identified eight modifications (specified as items A through H in safety evaluation) which were to be completed as part of the justification for the requested deviations. Only items C, D, and E of the safety evaluation remain incomplete.
Items C (detection and suppression above the radiochemical laboratory ceiling) and D (stairwell sprinkler system water curtain) will be completed before unit 2 restart.
During Plant Operations Review Committee (PORC) review of the workplan for installation of the open head water spray system in the 480-volt shutdown board rooms (item E), the effects of possible inadvertent system actuation on electrical equipment located in the room was questioned.
This question has recently been resolved with the decision to add additional drainage capability to prevent excessive water buildup.
The design work for this enhancement is underway, but not completed. The resolution and subsequent need for redesign has delayed field completion of this item.
The original design specified for item E is now scheduled for field completion before unit 2 restart (except for the drainage enhancement). Completion of this modification is not considered a restart item due to the compensatory actions specified below:
1.
The system will be installed to such a point as to allow manual initiation of the cable spray system, if needed, due to a fire.
2.
The fire watches will continue in the affected areas until the modification is completely operational, including the drainage enhancement.
In the event additional safety significant restart work emerges and this modification schedule slips such that item 1 above cannot be completed before unit 2 restart, you will be notified, and additional compensatory measures will be initiated before unit 2 restart. All work related to item E above will be field complete before June 30, 1987.
E
$NCLOS'URE2 LIST OF COMMITMENTS 1.
Complete the modification for item C (suppression and detection above the radiochemical laboratory ceiling) by unit 2 restart.
2.
Complete the modification for item D (stairwell sprinklar system water curtain) by u..it 2 restart.
3.
Install the original design specified for item E (open head water spray system in the 480-volt shutdown board rooms) to such a point as to allow manual initiation of the cable spray system by unit 2 restart.
4.
Complete the modification for item E, including the drainage enhancement, by June 30, 1987.
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