ML20106G132

Evaluation of Hydrostatic Testing of Fire Protection Yard Piping at Fermi 2

ML20106G132
Person / Time
Site:	Fermi
Issue date:	01/31/1985
From:	Olaughlin R PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20106G081	List: ML20106G079 ML20106G101 ML20106G122 ML20106G132
References
NUDOCS 8502140235
Download: ML20106G132 (10)

Text

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PROFESSIONAL LOSS CONTROL, INC.

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l EVALUATION OF HYDROSTATIC TESTING 0F THE FIRE PROTECTION YARD PIPING AT FERMI 2 DETROIT EDIS0N CO.

Date Submitted: January 31, 1985 lfe-Prepared by: Robert J. 0'Laughlin, P.E., CSP Senicr Fire Protection Engineer Professional Loss Control, Inc.

8502140235 850204 DR ADOCK 05000341 PDR P. O. Box 446

• Oak Ridge, Tennessee 37831 e (615) 482-3541

O O EVALUATION OF HYDR 0 STATIC TESTING OF THE FIRE PROTECTION YARD PIPING BACKGROUND The fire protection yard piping consists of looped 12 inch carbon steel piping which is coated and wrapped. Most piping connections are welded and a few are flanged. There is one electric motor driven and one diesel driven fire pump,. and both are rated at 2500 gpm at 150 psig. These pumps take suction from the general service pump house wetwell which is supplied from Lake Erie. The yard piping is connected and is pressurized by the general service water system with a check valve separating the systems. The fire pumps discharge into two separate connections to the underground 12 inch yard loop.

The general service water pumps maintain a constant pressure of 150 psig on the fire protection yard piping. The fire pumps start automatically on low header pressure. The electric motor driven puro starts at 130 psig and the diesel driven fire pump starts at 110 psig. Both pumps have pressure relief valves set at 170 psig. The yard piping was installed over 10 years ago.

HYDROSTATIC TEST On September 11, 1982, Detroit Edison Co. subcontractors (Phoenix Co.) per-formed a hydrostatic pressure test of the 12 inch nominal diameter piping in the yard loop. Dry barrel yard hydrants were included in the test with the valve (valve box) in the 6 inch lateral main opened. The test was con-ducted at a pressure of 200 psig + 18 for two (2) hours. The water leakage during the two hour test was 151 gallons. This computes to an average flow

-rate of 1.26 gpm. The allowable leakage per NFPA 24 whicn was computed by Detroit Edison's Field Engineering, was 75.2 gallons over the two (2) hour test period. The hydrostatic test measurements were made with a commercial water meter rather than measured at the test pressure by pumping from a calibrated container or head tank.

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d CONCLUSION The test results show that the leakage rate of the yard piping system was greater than the specified amount per NFPA 24 which is a standard for new private fire service mains.

However, with an average leakage rate of 1.26 gpm, the system performance is not jeopardized. This leakage rate is quite small when compared to a system capacity of 2500 gpm. This small leakage rate (1.26 gpm) is low for a water piping system that is over 10 years old.

The test pressure was 50 psig over the normal static pressure of 150 psig which is maintained constantly on the system by the general service water pumps. This test pressure was adequate for hydrostatically testing the system.

Even with a loss of offsite power causing a failure of the electric driven fire pump and the failure of the general service water pumps, the diesel driven fire pump (2500 gpm) provides the required water demand (1500 gpm for fire suppression system and 500 gpm for hose streams) plus can compen-sate for the average water leakage rate of 1.26 gpm.

In conclusion, the leakage ratio of 1.26 gpm will not adversely impact the water supply system adequacy or reliability in protecting nuclear safety related systems.

File Ref: FR-11-003-06 l

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EVALUATION OF GANGED MULTI-DAMPER ASSEMBLIES AT

FERMI 2

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. Cs, O 1.0 Introduction / Problem A study.cf Fermi's fire damper assemblies was performed by Detroit Edison to determine the fire rating of multi damper assemblies (gang dampers). Underwriter's Laboratories " Building Materials Directory" lists the size opening Air Balance, Inc. (Fire Damper Supplier) has tested. The sizes and ratings are as follows:

Maximum Opening Size Position Fire Rating 120" x 80" Vertical 1.5 Hours 97" x 42"~ Horizontal- 1.5 Hours s

72" x 72" Vertical 3 Hours 72" x 36" Horizontal 3 Hours A review of Fermi's fire damper assembly sizes indicate all are within the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> test size limits except as follows:

Damper No. Size Position FO 85 74" x 30" Vertical FO 90 84" x 84" Vertical FO 99 124" x 76" Horizontal FO 102 124" x 76" Horizontal FO 100 104" x 68" Vertical  ;

FO 101 104" x 68" Vertical An evaluation of each of these damper installations follows:

2.0 Division II Control Center HVAC Room (CC HVAC)

(Sketch 1)

Dampers F0 99 and F0100 separate the Control Room from the Division II CCHVAC Room. F0 100 is located in a wall between the two zotes. F0 99 is located in the Floor / Ceiling between the two zones.

2.1 Description of Fire Damper Location The Floor Assembly is rated as a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> barrier between the zones and consists of reinforced concrete. The wall is an 8" concrete block wall with a minimum rating of one hour.

N O o 2.2 Fire Hazards Combustible loading fgr the CCHVAC Room is approximately 1 lb/ftZ consisting of electrical cabling and small amounts of lubricating oil.

The Control Room Area is the air space between the Control Room drop ceiling

• nnd the reinforced concrete ceiling. The amra.at of combustibles above the drop ceiling is negligible.

2.3 Safe Shutdown Equipment The CCHVAC Room contains Division II HVAC equipment and Division I and II HVAC Appendix "R" shutdown cables. The Division I cables are enclosed in'a 3~ hour cable wrap. The Control Room

' contains all the control and instrumentation necessary for normal safe shutdown.

2.4- Fire Protection Fire detection is provided in both zones. The Control Room is manned 100% of the time. Manual hose is available along with portable extinguishers being located in each area.

2.5 Evaluation / Conclusion F0 100 is located in a-wall with a minimum one hour rating. This size opening 104" x 68" has been tested for.a 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating which is an acceptable fire rating for the fire loading located in each zone.

F0 99 is located in the floor. Damper installa-tion has been sectioned into 3 sets of 8 dampers each (76" x 41"). This size is within the 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating for horizontal openings. The material sub-dividing the opening is a 6" x 76" 10 gage steel plate.- Each damper weighs approximately 14 pounds. .This steel bar will provide the necessary fire. resistance because of the very low combustible loading in-each zone.

In addition, 14' gage steel is typically utilized for the duct sleeves. The Fire Dampers are' then-attached to this 14 gage sleeve.- By anchoring to a 10 gage bar the installation -is better than a normal installation anchoring point.

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L* Ceiling tile is 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated.

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/~T V Cs Division I Control Center HVAC Room (CCHVAC) 3.0 (Sketch 1)

Dempers FO 101 and FO 102 separates the Control Room from the Division I CCHVAC Room. FO 101 is located in a wall between the two zones. FO 102 is located in the Floor / Ceiling between the two zones.

3.1 Description of Damper Location The Floor Assembly is rated as a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> barrier between the zones and consists of reinforced concrete. The wall is an 8" concrete block wall with a minimum one hour fire resistance.

3.2 Fire Hazards Combustible loading f approximately 1 lb/ftgr the CCHVAC of consisting Room is electrical cabling and small amounts of lubricating oil.

The Control Room Area is the air space between the Control Room drop ceiling

• and the concrete ceiling. The amount of combustibles above the drop ceiling is negligible.

3.3 Safe Shutdown Equipment The CCHVAC Room contains Division I Appendix "R" shutdown cables and equipment. The Control Room contains all the control and instrumentation for normal shutdown.

3.4 Fire Protection Fire detection is provided in both zones. The Control Room is manned 100% of the time. Manual fire hose is available along with portable c,xtinguishers in each area.

h 3.5 Evaluation / Conclusion F0 101 is located in a wall with a minimum one hour rating. This size opening 104" x 68" has been tested for a 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating which is an acceptable fire rating for the fire loading located in each zone.

F0 102 is located in the floor. The opening has

-been sectioned into 3 sets of 8 dampers each.

(76" x 41") This size is within the 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating for horizontal openings. The material sub-dividing the opening is a 6" x 76" 10 gage steel plate. Each damper weighs approximately 14

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• Ceiling tile is 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated.

O- O pounds. This steel bar will provide the necessary fire resistance because of the very low combus-tible loadingJin the area. Additionally, l' gage steel is typically utilized for the ducts. The Fire Dampers are then attached to this 14 gage sleeve. By anchoring to a 10 gage bar the installation is better than a normal anchoring point.

- 4.0 Fourth Floor Auxiliary Building (Zone 13) (Sketch II)

The Fourth Floor Auxiliary Building houses the Reactor /

Auxiliary building ventilation system exhaust unit.

Fire' Damper FO 90 is located in a wall separating Zone' 13 from a pipe /HVAC duct chase in.the southwest corner.

Fire Damper FO 85 is. located in the wall separating the Control Room (Zone 9) from Zone 13 (see Sketch #2).

The Control Room area is the air space between the Control. Room drop ceiling *.and the Control Room ceiling.

i. 4.1 Description of Damper Location The, pipe chase is a 12 inch concrete block wall (3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> equivalent). The wall separating the Control Room:from the Fourth Floor Auxiliary Building is i

reinforced concrete and is a 3 hou,r fire rating.

i 4.2' ' Safe Shutdown Equipment Zone 13 contains both Division I and II Appendix R cables. Once operational, the 3L alternate shutdown system will be utilized for this zone.

The Control Room contains all the instrumentation and control necessary for normal shutdown.

4.3 Fire Hazards Combustible loading for Zone 13 is le.ss than 1 lb/ft2 consisting of electrical cabiles. The combustibles in the, Control Room air space is negligible. The Pipe /HVAC duct chase contains no appreciable amount of. combustibles..

4.4 Fire Protection

-Fire detection is provided in Zone 13 and the Control Room Air spaco.- The Control Room-is manned 100% of the time. A manual fire hose station is available for use by the trained fire brigade. Portable extinguishers are located in each zone.

• Ceiling tile is 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated.

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4.5 Evaluation / Conclusion FO 90 is a 84" x 84" assembly which is four inches wider than the 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> tested assembly. However, the overall assembly area size of FO 90 is 7056 sq.

inches, while the test assembly size was 9600 sq.

inches. Accordingly, Edison believes the test results of the tested assembly (1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating) are applicable to FO 90. This 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating for FO 90 is acceptable for this damper based on the low combustible loading of zone 13 and the pipe chase.

FO 85 is a 74" x 30" assembly which is 2 inches wider than the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> tested assembly. However, the overall assembly area size of FO 85 is 2220 sq.

inches', while the. test assembly area size was 5184 sq. inches. Accordingly, Edison believes the test results of the tested assembly (3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />) are applicable to F0 85. Another consideration is that the tested assembly size for 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> is 120" x 80". The 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> rating is acceptable because of the low combustible loadings of zones 13 and 9.

5.0 Additional Fire Damper Information The following vertical damper installations consist of two 1/2 hour dampers in series instead of three hour dampers:

FO 81 A,B FO 82 A,B FO 83 A,B FO 84 A,B The dampers were purchased in 1977. They are located in the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated zone boundary wall between the fourth floor Auxiliary Building and the Control Room.

(Air space between Control Room drop ceiling and con-crete ceiling). Even though a specific design test is not available, it is Edison's position that the 2 11 hour1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br /> dampers will prevent any postulated fires from spreading and is equivalent to a 3 Hour Fire Damper.

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