ML20137N838
| ML20137N838 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/26/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (NMP2L-0479), (NMP2L-479), NUDOCS 8509190322 | |
| Download: ML20137N838 (2) | |
Text
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M V NIAGARA R UMOHAWK NIAGARA MOHAWK POWER CORPORAT10N/300 ERIE BOULEVARD WEST. SYRACUSE. N Y.13202/ TELEPHONE (315) 4741511 August 26, 1985 (NMP2L 0479)
Mr. R. W. Stamstecki, Dimctor U.S. Nuclear Regulatory Comission Region I Division of Reactor Pmjects 631 Part Avenue King of Pmssia, PA 19406 Re: Nine Mile Point - Unit 2 Docket No. 410
Dear Mr. Stamstecki:
Enclosed is a final report in accordance with 10CFR50.55(e) for the pmblem concerning curtain-type fim dampers.
This pmblem was mported via tel-con to S.
Collins of your staff on September 7,1984.
Very truly yours, C. V. Mangan Senior Vice Pmsident CVM/GG/cla (1212H) xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gram, NRC Senior Resident Inspector c
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 t
DOCKET NO. 50-410 Final Report for a Problem Concerning Curtain-Type Fire Dampers (55(e)84-36)
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Description of the Problem The pmblem pertains to the closure operation under air flow and pmssure conditions of Quality Assumnce Category I curtain-type fire dampers fu r-nished by Pacific Air Pmducts Company.
The concern is that curtain-type fire dampers, especially multiple damper assemblies comprised of single dampers fused separately, have not been tested to ensure that all the units in an
- j assembly am capable of closing under air flow conditions.
An operability test of a
mpmsentative sample of Quality Assurance Category II and Category III, UL-listed curtain-type fire dampers myealed that some dampers failed to-close satisfactorily under air flow and pressure 4
conditions. The test was perfomed by American Waming and Ventilating, Inc.
Due to the failure of some of the Quality Assurance Category II and III i
cu rtain-type fi re dampers to close sati sfactorily during testing in the presence of air flow, an evaluation of Quality Assurance Category I curtain-type fire dampers was made to ensure that this equipment can close against the system air flow.
This evaluation, which was based on the test results of Quality Assurance Category II and III dampers, indicated that them are some Category I dampers not within the range of sizes of fi re dampers that satisfactorily passed the testing.
Analysis of Safety Implications I
Failure of the curtain-type fim dampers to close, in the event of a fire, may jeopardize the design function of a safety-related component.
The primary function of a fire damper is to provide a fire barrier through duct openings of fire-rated partitions.
Therefore, if this pmblem were to remain uncorrected, the fire protection criteria in accordance with 10CFR50 Appendix R may not be met.
Safe shutdown of the plant in the event of a fire could be adversely affected.
Based on the above, this problem could have adversely affected the safe operations of tne pl ant.
i Corrective Actions In order to verify that the dampers in question 'can close under air flow conditions, an in-place testing for closure under the actual system air flow conditions will be perfonned on the dampers.
These dampers will be tested during the preoperational testing of the Heating, Ventilation and Air Conditioning System.
Fire damper closure under air flow conditions will be verified and documented by the in-place field test.
This action is expected to be complete by Novenber 30, 1985 i
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