ML20235S070
| ML20235S070 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 02/27/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-89034, NUDOCS 8903060063 | |
| Download: ML20235S070 (3) | |
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""-" 9 Log # TXX-89034
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10CFR50.48 7UELECTRIC February 27, 1989 W. J. Cahm becutne Vkt Presiderut V. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 FIRE TEST ACCEPTANCE CRITERIA Gentlemen:
TU Electric is providing clarification concerning the use of ASTM E-119 temperature limit fire test acceptance criteria for unexposed surfaces of non load bearing walls and partitions.
This criteria is used for penetration seals.
The temperature limit criteria is established from ASTM E-119 sections 5.4 and 15.1.3 per commitments in FSAR section 9.5.1.6.1.D.3.d and parallels NFPA 251 referenced in Branch Technical Position APCSB 9.5.1.
ASTM E-119 Section 15.1.3 (NFPA 251, Section 7-2(c)) provides the temperature acceptance criteria for non-bearing walls and partitions.
A temperature increase on an unexposed surface is acceptable if it does not exceed 250 F0 above its initial temperature.
ASTM E-119 Section 5.4 (NFPA 251, Section 2-3.4) pr ovides temperature acceptance conditions when there is a limitation on temperature rise for the unexposed surface.
Section 5.4 states that the temperature end point for the fire endurance period is based on an average of the temperatures taken at individual points with the exception that if a temperature rise of 30% in excess of the specified limit occurs at any one of these points, the remainder shall be ignored and the fire endurance period judged as ended.
TV Electric applies ASTM E-Il9 using the following temperature limit acceptance criteria for non-bearing walls and partitions:
o Unexposed Surface Temperature Rise Limit is 250 F0, and o Single Point Temperature Rise Limit is 30% above the 250 FO limit (i.e. 325 F0 Maximum Single Point Temperature Rise).
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l TXX-89034 February 27, 1989 Page 2 of 2 l
An example of how these acceptance criteria are applied for a fire test is provided in the attachment to this letter.
TV Electric's application of the fire test acceptance criteria for unexposed surface temperature limit, as described above, is in compliance with the requirements established in ASTM E-119.
Sincerely,
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William J. Cahill, Jr.
JDS/ddm Attachment c - Mr. R. D. Martin, Region IV l
Resident Inspectors, CPSES (3) 1 l
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Attachment to TXX-89034
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February 27, 1989 l
Page 1 of 1
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The following example is provided to illustrate how these acceptance criteria are applied for a fire test:
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l Initial Final Single Point Thermocouple Temperature (OF)
Temperature (OF)
Temperature Rise (FO) 1 74.1 305.5 231.3 2
74.1 369.8 295.7 3
74.2 313.7 239.5 4
74.0 309.6 235.6 5
74.2 294.6 220.4 The temperature rise on the unexposed surface is determined by the average of the single point temperature rises (244.5 FO).
The example test is considered acceptable because the temperature on the l
unexposed surface is (244.5 FO) less then 250 F0 and no single point temperature rise exceeds 30% above 250 F0 (325 FO).
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