ML20035E628
| ML20035E628 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 04/09/1993 |
| From: | Frizzle C Maine Yankee |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CDF-93-59, GL-92-08, GL-92-8, MN-93-40, NUDOCS 9304190041 | |
| Download: ML20035E628 (5) | |
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MaineYankee REllABLE ELECTRICITY FOR MAINE SINCE 1972 Charles D For21e Edison Drive Presdent Augusta. Marne 04336 (207) 6224868 April 9. 1993 MN-93-40 CDF-93-59 UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Washington, DC 20555
References:
(a)
License No. DPR-36 (Docket No. 50-309)
(b) MYAPCo Letter to USNRC dated July 22, 1992 (MN-92-75)
(c) MYAPCo Letter to USNRC dated September 30, 1992 (MN-92-96)
(d) USNRC Letter dated October 29, 1992 - Maine Yankee Atomic Power Station, Closure of NRC Bulletin 92-01, " Failure of Thermo-Lag 330 Fire Barrier System" (e) USNRC Letter dated December 17, 1992 - Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers"
Subject:
NRC Generic Letter 92-08: Thermo-Lag 330-1 Fire Barriers Gentlemen:
NRC Generic letter 92-08, Reference (e), requested licensees to confirm (1) that the Thermo-Lag 330-1 barrier systems have been qualified by representative fire endurance tests, (2) that the ampacity derating factors have been derived by valid tests, and (3) that these qualified barriers have been installed with appropriate procedures and quality controls to ensure that they comply with the NRC's requirements.
The status of the actions requested by Reference (e) at Maine Yankee, consistent with the presentation of the Reporting Requirements are as follows:
NRC Reportina Reauirement No. 1:
State whether Thermo-Lag 330-1 barriers are relied upon (a) to meet 10CFR50.48, to achieve physical independence of electrical systems, (b) to meet a condition of a plant's operating license, or (c) to satisfy a licensing commitment.
If applicable, state that Thermo-Lag 330-1 is not used at the facility.
This generic letter applies to all 1-hour and all 3-hour Thermo-Lag 330-1 materials and barrier systems assembled by any assembly method such as by assembling preformed panels and conduit shapes, as well as spray, trowel and brush-on applications.
Maine Yankee Response:
Table 1 of Reference (b) provided a listing of the Thermo-Lag fire barriers installed at Maine Yankee.
All of the barriers were installed to meet a
l 10CFR50.48, to achieve physical independence of electrical systems. Barrier No.
e 6 was subsequently determined to not be required. A copy of Table 1 is attached for reference.
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MaineYankee UNITED' STATES NUCLEAR REGULATORY COMMISSION MN-93-40 Attention: Document Control Desk Page 2 NRC Reportino Reogirement No. 2:
If Thermo-Lag 330-1 barriers are used at the facility, (a) State whether or not the licensee has qualified the Thermo-1ag 330-1 fire barriers by conducting fire endurance tests in accordance, tith the NRC's requirements and guidance or licensing commitments.
Maine Yankee Response:
Maine Yankee did not perform fire endurance tests to qualify its Thermo-Lag 330-1 fire barriers.
Rather, we relied on the fire endurance tests conducted by TSI, Inc. which, per TSI, Inc., had been approved by-the American Nuclear Insurers (ANI) and the NRC for use in nuclear plants.
(b) State (1) whether or not the fire barrier configurations installed-in the plant represent the materials, workmanship, methods of-assembly, dimensions, and configurations of the qualification test assembly-configurations; and (2) whether or not the licensee has evaluated any deviations from the tested configurations.
Maine Yankee Response:
I (1) As stated in our response to (a) above, specific Maine Yankee testing l
l was not performed. TSI, Inc. certified in writing that the configurations installed at Maine Yankee were covered by the generic testing performed for TSI, Inc. The materials, workmanship, and methods of assembly used at Maine Yankee were in accordance with TSI, Inc. instructions. Maine Yankee personnel were trained and qualified to install Thermo-Lag materials by TSI, Inc.
(2)
Maine Yankee has not evaluated any deviations from tested configurations.
i (c) State (1) whether or not the as-built Thermo-Lag 330-1 barrier configurations are consistent with the barrier configurations used during i
the'ampacity derating tests relied upon by the licensee for the ampacity derating factors used for all raceways protected by Thermo-Lag 330-1 (for i
fire protection of safe shutdnwn capability or.to achieve physical independence of electrical systems) and (2) whether or not the ampacity derating test results relied upon by the licensee ~ are correct and-l applicable to the plant design.
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UNITED' STATES NUCLEAR REGULATORY COMMISSION MN-93-40 Attention: Document Control Desk Page 3 Maine Yankee Response:
(1) Fire Barrier No. 2 in the. Primary Auxiliary Building (Elevation 11 l
feet) is the only configuration for which ampacity derating is a design consideration. The cable derating was determined using code requirements and cable manufacturer guidelines for the expected temperature in the enclosure. An enclosure specific calculation was performed to determine the temperature rise within the enclosure using a thermal conductance of 1.2 BTU /hr-ft"
- F/in. obtained from the TSI, Inc's Thermo-Lag 330-1 i
catalog. This calculation is on file at Yankee Atomic Electric Company.
(2) The conductance value used in the calculation was confirmed in a documented telecon between Maine Yankee and TSI, Inc. on 01/13/89. Maine Yankee, however, does not have any test result information supporting the correctness of the information provided by TSI, Inc.
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NRC Reportino Reauirement No. 3:
With respect to any answer to items.2(a), 2(b), or 2(c) above in the negativa, (a) describe all corrective acNns needed and include a schedule by which such actions shall be completed and (b) describe all compensatory measures taken in accordance with the technical specifications or administrative controls. When corrective actions have been' completed, confirm in writing their completion.
Maine Yankee Response:
i As described in Reference (c), Maine Yankee plans to eliminate the need for all I and 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated Thermo-Lag fire barriers by cable re-routing, use of standard masonry fire barriers, or use of materials with the appropriate Underwriters Laboratory fire endurance rating. The plant modifications required to eliminate the Thermo-Lag material are scheduled to be completed, to the extent possible, in 1994. Any work requiring plant shutdown will be completed during the 1995 refueling outage.
The compensatory measures which were.found acceptable in t
Reference (d) will remain in place until the necessary plant modifications are l
completed.
Maine Yankee will confirm in writing once the modifications to eliminate the need for Thermo-Lag fire barriers have been completed.
j NRC Reportina Reauirement No. 4:
l List all Thermo-Lag 330-1 barriers for which answers to item 2 cannot be l
provided in the response due within 120 days from the date of. this generic letter, and include a schedule by which such answers shall be provided.
Maine Yankee Response:
Answers are provided for all barriers in item 2 above.
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i UNITED' STATES NUCLEAR REGULATORY COP 911SSION MN-93-40 l
Attention: Document Control Desk Page 4 l
t We trust.this information is satisf:ctory.
Please contact us :h: ld /:: h:te j
any questions in this matter.
)
j Very truly your
'/rizzlel
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ar es D.
President and Chief Executive Officer Attachment CDF/ jag c:
Mr. Thomas T. Martin Mr. E. H. Trottier Mr. Charles S. Marschall Mr. Patrick J. Dostie Mr. Alex Marion - NUMARC-STATE OF MAINE Then personally appeared before me, Charles D. Frizzle, who being duly sworn did state that he is President and Chief Executive Officer of Maine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing response in the name and on behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the. best of his knowledge and belief.
Fe!W<4 N e
.)i6tary Public BARBARA J. PADAVANA 1
WYco So S
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O TABLE 1 Tha following is a listing of the applications of Thermal Science, Inc. (TSI) Thermo-Lag materials used at Maine Yankee M
M Bt CABLES PURPOSE RATING PA_Ijl fj],NNJ IGUR ATION U111Ri!L I
MCC, EL 21 A.
Cables for Valves for RCP seal water Ihour Two conduits from valve house Preformed comiu'secteuns Automatic IICV-251 isolation, decay heat release, through MCC el 21 to low ea level (2*) and junction imes CO2 and Smoke llCV-261 ano steam dnven aus. feed PAB thicction llCV 271 pump control IICV-1001 TV-1102 2
PAB, EL 11 A.
Cables for Charging pump P-14 A,148, 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> PAB lower level el 11: Cables Urustrut reinfoned Snw4 e Charging /
14C power cables in>m el 21 emit into ductbank enclosure thiection llPSI pumps junction box at -el Il +
3 PAB, EL ll A.
Cables for Valves for RCP seal water 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> PAB tunnel (el 1I)- two conduits Prefunned conduit sections llELB llCV-151 isolation, decay heat release, from MCC cl 21 go through (3*) and urustrut reinforced Temperature llCV 261 and siesm driven aus. feed tunnel, turn op i mo alternate enclosure Momsorms llCV-278 pump control shut #Nn panel llCV 1001 TV-1102 4
CONTAINMENT, NI l Neutron Neutron monitoring Radiant Containment from Ich sump to Preformed conduit sections Srnoke EL -2 A.
ilux inst. cable shield cisne well peras.siion (l *)
Desection 5
PAB HPSI VALVE P-7 Cable Aux charging pump -alternate 3 hout PAB llPSI Valve room, el 21 Unistrut reinforced llLLB power cables cables enter room from cuiside enclosure Tempersiure ROOM,EL21A e
and travel vertically down to lower Monitunng level PAB 6
MCC, EL 28 and Cables for Steam gen. Emp i level I hour Enters floor of lower MCC el 2 8.
Prefonned condust sections Automatic MCC. EL 33.4 A LT-1214 indication and cmits ceiling of upper MCC (l* end 5*)
CO2 armi Sir +
LT-1224 steam gen. Loop 2 level room, el 33.4 into South Detecison indicesion Penetration Room.
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