ML17146B009

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Suppl 2 to Evaluation of Selected Fire Door & Door Frame Assemblies, Technical Rept
ML17146B009
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 06/30/1986
From: Dobson P, Knight S
FACTORY MUTUAL RESEARCH CORP.
To:
Shared Package
ML17146B007 List:
References
NUDOCS 8710230360
Download: ML17146B009 (15)
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TECHNICAL REPORT EVALUATION OF SELECTED FIRE DOOR AND DOOR FRAME ASSEMBLIES (SUPPLEMENT 2)

By Samuel M. Knight Prepared for:

Pennsylvania Power & Light Company "Susquehanna Steam Electric Station" Route 11 Salem. Township, Pennsylvania 15635 June 1986 Approved by:

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P. H. son Senior Engineer FMRC I-aetory iwutual Research

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1151 Boston- Providence Te apace Norwood. Massachusetts 02062

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TORY MUTUAL RESEARCH CORPORA TIO

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TABLE OP CONTENTS Section Title ~Pa e

SUMMARY

AND CONCLUSIONS ii INTRODUCTION 1 II PIRE DOOR AND FRAME EVALUATION 2 III RECOMKDG)ATIONS

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TORY MUTUAL RKSEARCM CORPORATIO

SUMMARY

AND CONCLUSIONS An evaluation of selected fire doors protecting safety related areas was conducted for the Pennsylvania Power & Light Company (PP&L) at Susquehanna Steam Electric Station, Units 1 & 2. The purpose of the evaluation was to ezamine certain unlabeled doors and compare them with labeled door construction, and render an opinion on their expected fire resistance, This evaluation was requested by PP&L as a supplement to the original evaluation in a Factory Mutual report dated January 1985, and Supplement 1, dated August 1985.

The following conclusions were reached:

1. Door 112 on Level 670 may be ezpected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> of fire resistance.
2. Door 202 on Level 683 may be expected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> of fire resistance.
3. Door 407 on Level 719 may be expected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> of fire resistance when the four 1/8 in. diameter holes in the face sheet are sealed with sheet metal screws.
4. Door 514 on Level 749 may be expected to provide 1-/2 hours of fire resistance. If the existing latch bolt is replaced with a latch having a 3/4 in. throw, this door may be expected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> Lire resistance.
5. Door 530 on Level 761 may be ezpected to provide 1-1/2 hours of fire resistance. If the existing latch bolt is replaced with a latch having a 3/4 in. throw, this door may be ezpected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire resistance.
6. Door 711 on Level 799 may be ezpected to provide 1-1/2 hours of fire resistance.- If the existing latch bolt is replaced with a latch having a 3/4 in throw, this door may be ezpected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire resistance.

TORY MUTUAI, RESEARCH CORPORATI INTRODUCTION The Susquehanna Steam Electric Station was visited on April 4, 1986 and May 16, 1986. The writer was accompanied by Mr. S. E. Davis of PAL; Mr. L. J. Mattern of FMEA was present during the April visit. Three unlabeled doors and frames were examined during each visit. The door assemblies are located in Unit 1 6 2 Reactor Buildings.

The writer is a Prospect Engineer with 20 years'xperience at the Factory Mutual Research Corporation (FMRC). The writer has served on the National Fire Protection Association "Fire Doors and Windows" Committee (NFPA 80) for 18 years. His primary responsibilities are: 1) Testing and determination of fire ratings for fire doors; and 2) Examination of installed unlabeled doors to determine their fire resistance rating for building authorities.

CTORY MUTUAL RESEARCH . CORPORATI PIRE DOOR AND FRAME EVALUATION Six unlabeled fire doors and frames vere examined during tvo visits to the Susquehanna Steam Electric Station at the request of the Pennsylvania Power 6 Light Company (PP6L). Expected fire resistance ratings for each door vere determined through comparison vith labeled doors.

2.1 FIRE DOOR FRAMES All frames are fabricated in accordance with the American National Standards Institute, Standard A155.1, and may be expected to provide 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> of fire resistance.

2.2 FIRE DOORS The folloving unlabeled fire doors were examined by comparing their construction features with labeled fire doors.

2.2.1 Door 112 Door 112 on Level 670 was compared to Door 421, a 3-hour labeled door on Level 719; it is concluded that Door 112 has an expected 3-hour rating based on the folloving results:

1. Both doors are the same size.
2. Internal stiffeners in both doors are 6 to 8 in. on center. This vas determined by means of a stethoscope.
3. Face sheets, hinge reinforcements and peripheral channel framing are essentially the same. Measurements vere made using a specially adapted micrometer. In addition latch throvs in Door 670 are equal to or greater than the 3-hour labeled door.

4~ Door 421 has a lov-density glass fiber insulation in the door cavity while Door 112 does not. This lov density insulation has no significant bearing on the performance of a door in a fire situation.

TORY MUTUAL RESEARCH CORPORATIO 2.2.2 Door 202 Door 202 on Level 683 was examined and its construction details were-compared with those of Door 110 a 1-1/2-hour (subsequently upgraded to 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />) labeled door on Level 670; it is concluded that Door 202 has an ezpected 3-hour rating based on the following observations:

1. Both doors are the same size.

-2. Internal stiffeners in both doors are 6 to 8 in. on center.

3. Pace sheets, hinge reinforcements and peripheral channel framing have the same measurements. The 3<
>hour rated door, this shorter latch throw dictates a shorter ezpected fire resistance of l-l/2 hours. Since greater forces are generated in the assembly during a 3-hour ezposure, there is increased possibility that the shorter latch bolt vill be pulled out of the strike during ezpansion and distortion of the door and frame, resulting in failuire. Experience has shown that if the construction of the door is adequate, a 1/2-in. latch throw is adequate to achi.eve a 1-1/2-hour ezpected fire resistance. If the 5/8-1.n. bolt is replaced with a 3/4-in. bolt, the door may be ezpected to provide up to 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire resistance.

2 '.5 Door 530 Door 530 on Level 761 vas examined to compare its construction details against Door 421, a 3-hour labeled fire door on Level 719; it is concluded that Door 530 has an ezpected 3-hour rating based on the following evidence:

1. Both doors are of the same size.
2. Internal stiffeners in both doors are 8 to 12 in. on center.
3. Face sheets, hinge reinforcements and peripheral channel framing are essentially the same.
4. The labeled door is fitted with a single point latch having a 3/4 in.

throw, while Door 530 has a 5/8 in. throv. Although the construction of Door 530 is comparable vith the 3-hour rated door, this shorter latch throv dictates a shorter expected fire resistance of 1-1/2 hours. Since greater forces are generated in the assembly during a'-hour exposure, there is increased possibility that the shorter latch bolt will be pulled out of the strike during expansion and distortion of the door and frame, resulting in failuire. Ezperience has shown that if the construction of

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TORY MUTUAL RESEARCH CORPORATI I

'l the door is adequate, a 1/2-in. latch throw is adequate to achieve a 1-1/2-hour expected fire resistance. If the 5/8-in. bolt is replaced with a 3/4-in'olt, the door may be expected to provide up to 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire resistance.

2.2.6 Door 711 Door 711 on Level 799 was examined to compare its construction details against Door 421, a 3-hour labeled fire door on Level 719; it is concluded that Door 711 has an expected 3-hour rating baaed on the following evidence!

1. Door 711 was 6 in. narrower than Door 799. Tests have shown that doors smaller than tested will provide equivalent performance if all other construction details are the same.

24 Internal stiffeners are 8 to 12 in. on center.

3~ Pace sheets, hinge reinforcements and peripheral channel framing are essentially the same.

4 ~ The labeled door is fitted with a single point latch having a 3/4 in.

throw, while Door 711 has a 5/8 in. throw. Although the construction of Door 711 is comparable with the 3 hr. rated door, this shorter latch throw dictates a shorter expected fire resistance of l-l/2 hours. Since greater forces are generated in the assembly during a 3-hour exposure, there is increased possibility that the shorter latch bolt will be pulled out of the strike during expansion and distortion of the door and frame, resulting in failuire. Experience has shown that if the construction of the door is adequate, a 1/2-in. latch throw is adequate to achieve a 1-1/2-hour expected fire resistance. If the 5/8-in. bolt is replaced with a 3/4-in. bolt, the door may be expected to provide up to 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire resistance.

I CTORY MUTUAL RESEARCH CORPORATIO III RECOMMENDhTIONS

1. To obtain a 3-hour fire resistance rating the four 1/8-in. diameter holes in the face sheet of Door 407 on Level 719 should be filled using sheet metal screws.
2. To increase the 1-1/2-hour fire resistance rating to 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />, the 5/8 in.

throw latch bolts on Door 514 on Level 749; Door530 on Level 761; and Door 711 on Level 799 should be replaced with latch bolts having a 3/4 in. throw.

DEVIATION REQUEST NO. 3 SUSQUEHANNA STEAM ELECTRIC STATION - UNITS 1 5 2 FIRE PROTECTION PROGRAM - CONCERN Pl DOCKETS NO. 50-387 50-388 APPENDIX A - DEVIATION REQUESTS DEVIATION REQUEST NO. 3 ATTACHMENT 4

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