ML20036C137
| ML20036C137 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/09/1993 |
| From: | Fenech R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-93-002, IEB-93-2, NUDOCS 9306140288 | |
| Download: ML20036C137 (3) | |
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Tennessee Valley Autnanty Post Ofhce Box 2000, Soddy Dasy, Tennessee 37379 2000 l
Robert A Fenech l
V:ce Dremdent Eegtoyah Nuclear Rrn
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June 9, 1993
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U.S. Nuclear Regulatory Commission
.l ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328
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SEQUOYAH NUCLEAR PLANT (SQN) - NRC BULLETIN 93-02: DEBRIS PLUGGING OF EMERGENCY CORE COOLING SUCTION STRAINERS The purpose of this letter is to provide TVA's response to the subject.
j
. bulletin.for SQN. The requested action contained in the bulletin-is to i
identify fibrous air filters.or other temporary sources of fibrous material not designed to withstand a loss of coolant accident that are installed or stored in primary containment.
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Fibrous air filters are not installed in primary containment during
.l normal plant operation (i.e., Modes 1 through 4) but are during outages.
i These temporary filters are installed to maintain the efficiency of the lower-compartment coolers and are installed and removed by means of a preventive maintenance (PM) instruction. An additional source of temporary fibrous material is contained in the vacuum cleaner filters and the high efficiincy particulate air filters contained in portable air-handling units used in containment during outages. The vacuum cleaners' use is controlled by procedure with the individual using the apparatus required to return it immediately after completing the job.
The final cleanliness inspection required before exiting the work area j
after the job has been completed ensures that the portable air-handling units are properly removed.
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U.S. Nuclear Regulatory Commission Page 2 June 9, 1993 To provide additional assurances of containment cleanliness, a final inspection is performed using Surveillance. Instruction 0-SI-0PS-000-187.0, " Containment Inspection." This' procedure requires a containment inspection before entry into Mode 4 from Mode 5, and was created to provide a final inspection to ensure that equipment.. dirt, and tools have been removed to prevent potential blockage of the containment sump screen in accordance with Technical Specification Surveillance Requirement 4.5.2.c.
Permanently installed fibrous materials, such as the pressurizer safety loop-scal insulation and the lead-shielding fire blankets, have been evaluated.
This evaluation determined that collectively, the permanently installed fibrous material will not have any adverse effects during an accident.
Therefore, it is concluded that the safe operation of the emergency core cooling system and the containment spray system would not be compromised by the presence of the quantities and types of fibrous material inside containment. Based upon the above discussions, no additional actions are required.
Please direct questions concerning this issue to W. C. Ludwig at (615) 843-7460.
Sincerely, f.
<,k Robert A. Fenech Sworn to and subscr + d before me this _ 1 day of h 1993 4Idek-c/f
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Notary Public
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My Commission Expires
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'U.S.' Nuclear Regulatory Commission Page 3 June 9, 1993 cc:
Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike e
Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road l
Soddy-Daisy, Tennessee 37379-3624 Regional Administrator i
U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 5
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