ML20153B856
| ML20153B856 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/25/1988 |
| From: | James Smith TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 0022Q, 22Q, 88-03, 88-3, NUDOCS 8808310123 | |
| Download: ML20153B856 (3) | |
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Sequoyah Nuclear Plant Post Office Box 2000 Soddy-Daisy Tennessee 37379 August 25, 1988 U. S. Nuclear Regulatory Comission Document Control Desk Washington, DC 20555 Gentlemen:
TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 - DOCKET WOS. 50-327 AND -328 - FACILITY OPERATING LICENSE DPR-77 AND DrR SPECIAL REPORT 88-03 REVISION 1 The enclosed special report is being revised to provide completion schedule for corrective action concerning a fire barrier being nonfunctional for greater than seven days.
This event was previously reported in accordance with action statement (a) of Limiting conditions for Operation 3.7.12, on February 26, 1988.
Very truly yours.
TENNESSEE VALLEY AUTHORITY r
2 c),
S. J.
Plant Manager Enclosure i
cc (Enclosure):
J J. Nelson Grace Regional Administrator U. S. Nuclear Regulatory Comission Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323 l
kecords Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Sequoyah Nuclear Plant Y
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s SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 j
SPRCIAL REPORT 88-03 This report is being revised to provide completion schedule for corrective l-action.-
DESCRIPTION OF EVENT 4
On February 4. 1988, with unit 1 in mode 5 (0 percent power. 4 psig.
124 degrees F) and unit 2 in mode 5 (0 percent power 370 psis, j
188 degrees F). a fire barrier (suspended ceiling in Control Building elevation 732, housekeeping area) was nonfunctional for an interval greater
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than seven days.
On January 22, 1988 Division of Nuclear Engineering issued a Condition j
Adverse to Quality Report (CAQR) (SQF 880015) that identified the suspended cement plaster ceiling in the Control Building elevation 732.. rooms C-5 C-6 C-7. and C-8. may not provide a one and one-half hour fire barrier required by the Final Safety Analysis Report (FSAR) Section 9.5.1.3.
While the evaluation of the suspended cement plaster ceiling was continuing, a fire breach was issued on January 28, 1988, and an hourly fire watch was established. However, the evaluation and any actions to ensure that the suspended ceiling will provide a one and one-half hour fire barrier was not done within the seven days requiring a special report in accordance with technical specification (TS) Limiting Condition for Operation (LCO) 3.7.12.
CAUSE OF KVENT i
Evaluation of the suspended ceiling to ensure a one and one-half hour fire barrier was not done within seven days. The questionable one and one-half hour fire barrier was based on potential problem discovered in TVA's j
procurement specification prepared to obtain contractors' services for i
installation of the suspended ceiling. These were (a) the sand specified (and provided) is appropriate for gypsum plaster, not cement plaster, and is therefore too fine and in too great a quantity and (b) the specified curing method (through dry out of each plaster coat before application of succeeding coats) results in minimal bonding between the plaster coats.
The shave described two conditions could potentially decrease the capability of the installed ceiling to resist cracking and delsmination of the plaster
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coats due to thermal effects during a fire.
ANALYSIS OF EVENT This event is being reported in accordance with the requirements of action statement (a) of LCO 3.7.12.
l A roving fire watch was established to inspect the Control Building elevation 732. rooms C-5. C-6. C-7. and C-8. on an hourly basis as required by the action statement of LCO 3.7.12.
The existing fire detection and fire suppression system for the affected area are operable and would actuate in the event of a fire. Therefore, there is no danger to safety-related equipment, l
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A CORRECTIVE ACTION The engineering evaluation determined that the existing suspended ceiling needs to be replaced with a new suspended ceiling which will provide a one and one-half hour fire barrier. The replacement of the suspended ceiling is scheduled to be completed by May 30, 1989.
A roving fire watch at a regular interval of one hour was established and will be maintained until the replacement of the suspended ceiling is completed. CAQR SQF880015 will be used to document the evaluation and actions taken.
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