05000348/LER-1990-007, :on 901013,preaction Fire Protection Sys Clapper Valves Failed to Trip
| ML20065K472 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 11/21/1990 |
| From: | Hairston W, Dennis Morey ALABAMA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LER-90-007, LER-90-7, NUDOCS 9011290224 | |
| Download: ML20065K472 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 3481990007R00 - NRC Website | |
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Alabama Power Company 40 inverness Center Parkway Post Office Box 1295 '
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' Telephone 205 808-5581 W. O. Haltston,111 Senior Vice President AlabamaPower November 21, 1990 the southem elecinc system 10CFR50.73 Docket No. 50-348 U.-S. Nuclear Regulatory Commission ATTN: Document Control Desk Vashington, D.C. 20555 Gentlemen Joseph M. Farley Nuclear Plant - Unit 1 Licensee Event Report No. LER 90-007-00 Joseph M.- Farley Nuclear Pita *. Unit 1, Licensee Event Report No. LER 90-007-00 is being submitted in accordar.ce with 10CFR50.73.
If you have any questions, please' advise.
Respectfully submitted, V.
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- - Enclosure ce: Mr. S. D. Ebneter Mr. G. F. Maxwell
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,,o..e P,, nee.ye Nme,,-,,..,,,*., H i On 10-13-90, during an investigation to determine why fire protection system clapper valves failed to trip, it was determined that the diaphragms in some of these valves at FNP have deteriorated and/or deformed over time, which caused them to function improperly.
'the current preventive maintenance program vill be changed to include periodic replacement of the diaphragms on proaction fire protection systems.
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Summary of Event on 10-13-90, during an investigation to determine why fire protectio'n system clapper valves failed to trip, it was determined that the diaphragms in some of these valves at pnp have deteriorated and/or deformed over time, which caused them to function improperly.
Description of Event
In attempting to reset several clapper valves, the vorkers found that the clapper valves were not in the trippri condition.
The clappers were then tripped manually.
An investigation va:: initiated in coordination with the vendor of the clapper valves.
On 10-13-90, it was determined that the problem occurred because the diaphragms, over a period of time, can veaken, deteriorate, and/or deform. This can prevent the clapper from tripping and it can give a local indication that the clapper is tripped when it actually is not tripped.
Cause of Event
w Some of the clapper valves were found to have age-veakened, deteriorated, and/or def ormed diaphragms which prevented the cla;)pers f rom tripping.
Leaking diaphragms can also give a local indication that the clapper is tripped when actually it is not tripped, f
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Corrective Action
All of the Technical Specification clapper valves on both units had already been placed in the tripped condition on 10-09-90 and 10-10-90 vith the exception of the clappers for systeme 1A-135 (Unit 1) and 2A-56 (Unit 2).
These two systems have open sprinkler heads and tripping their clappers vould have resulted in the discharge of water. An hourly fire vatch has been posted in the areas protected by systems 1A-135 and 2A-56.
The current preventive maintenance program vill be changed to include periodic replacement of the diaphragms on preaction fire p.etection systems. The clappers vill remain tripped until replacement of the diaphragms, which is expected to be completed by the end of December, 1990.
Reportability Analysis and Safety Assessment The event is being reported voluntarily.
Fire vatches required by Technical Specifications have been esteblished as required.
The failure of these clapper valves had no effeet on plant operation.
The health and safety of the public vere not affected by this event.
Additional Information
Unit 1 vas operating at approximately 100 percent power on 10-13-90.
This event vould not have been more severe if it had occurred under different operating conditions.
No similar LERs have been subinitted by FNP.
The clapper valves are Model A4 Hultimatic Valves made by Grinnell Fire Protection Systems Company, Inc., 10 Dorrance Street, Providence, Rhode Island, 02903.
NRC Form astA HL89)