ML20215M341
| ML20215M341 | |
| Person / Time | |
|---|---|
| Issue date: | 05/11/1987 |
| From: | Berlinger C Office of Nuclear Reactor Regulation |
| To: | Mcquillan P LIMITORQUE CORP. |
| References | |
| REF-QA-99900100 NUDOCS 8705130194 | |
| Download: ML20215M341 (5) | |
Text
a May 11, 1987 Docket No. 99900100 Limitorque Corporation ATTN: Mr. P. McQuillan Quality Assurance Administrator 5114 Woodall Road Lynchburg, Virginia 24502 Gentlemen:
Subject:
DRAFT INFORMATION NOTICE ON MARATHON 1600 TERMINAL BLOCKS The Nuclear Regulatory Commission is in the process of preparing an information notice entitled " Environmental Qualification Test Failures of Marathon 1600 Terminal Blocks."
A copy of the latest draft of this information notice is enclosed for your review and comment.
Comments received by May 20, 1987, particularly those dealing with the facts presented in the information notice, will be considered in the final revision.
Sincerely, Carl H. Berlinger, Chief Generic Communications Branch Division of Operational Events Assessment Office of Nuclear Reactor Regulation
Enclosure:
Information Notice
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May 11, 1987-Docket No. 99900100 Limitorque Corporation ATTN: Mr. P. McQuillan Quality Assurance Administrator 5114 Woodall Road Lynchburg, Virginia 24502 Gentlemen:
Subject:
DRAFT INFORMATION NOTICE ON MARATHON 1600 TERMINAL BLOCKS The Nuclear Regulatory Commission is in the process of preparing an information notice entitled " Environmental Qualification Test Failures of Marathon 1600 Terminal Blocks."
A copy of the latest draft of this information notice is enclosed for your review and comment.
Comments received by May 20, 1987, particularly those dealing with the facts presented in the information notice, will be considered in the final revision.
Sincerely,
/
Carl H. Berlinger, Chief Generic Communications Branch Division of Operational Events Assessment Office of Nuclear Reactor Regulation
Enclosure:
Information Notice DISTRIBUTION:
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\*****/ May 11, 1987 Docket No. 99900100 Limitorque Corporation ATTN: Mr. P. McQuillan Quality Assurance Administrator 5114 Woodall Road Lynchburg, Virginia 24502 Gentlemen:
Subject:
DRAFT INFORMATION NOTICE ON MARATHON 1600 TERMINAL BLOCKS The Nuclear Regulatory Comission is in the process of preparing an information notice entitled " Environmental Qualification Test Failures of Marathon 1600 Terminal Blocks."
A copy of the latest draft of this information notice is enclosed for your review and coment.
Coments received by May 20, 1987, particularly those dealing with the facts presented in the information notice, will be considered in the final revision.
Sincerely, Carl H. Berlinger, Chie Generic Communications Branch Division of Operational Events Assessment Office of Nuclear Reactor Regulation
Enclosure:
Information Notice -
1 i
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.c IN 87-XX in c UNITED STATES NUCLEAR REGULATORY COMMISSION.
OFFICE OF INSPECTION'AND ENFORCEMENT WASHINGTON, D.C. 20555 April XX, 1987-NRR INFORMATION NOTICE N0. 87-XX: ENVIRONMENTAL QUALIFICATION TEST FAILURES OF MARATHON 1600 TERMINAL BLOCKS Addressees:
All nuclear power reactor facilities holding an operating license or a construction permit.
Purpose:
To alert addressees to environmental qualification (EQ) test failures involving Marathon 1600 and 1500 terminal blocks (tbs) and to point out certain limita-tions in TB testing reported in Limitorque Qualification Test Report No. B0119.
It is expected that recipients will review the information for applicability to their facilities and consider actions, if appropriate, to preclude similar problems. However, suggestions contained in this information notice do not constitute NRC requirements; therefore, no specific action or written response is required.
Description of Circumstances:
In September 1986, Pennsylvania Power and Light Company (PP&L) EQ personnel became aware that the 1600s (and 1500s) had failed in Marathon sponsored EQ tests at Wyle Laboratories (Wyle Report No. 45603-1 dated February 1982). The failure mode was shorting with the attendant inability to maintain the tbs ener-gized at 528 ' lac. The samples had been thermally aged for 444 hours0.00514 days <br />0.123 hours <br />7.34127e-4 weeks <br />1.68942e-4 months <br /> at 248'F.
Failure occurced during loss-of-coolant-accident (LOCA) simulation at 365 F when the samples were energized with 528 Vac for an operability test using a motor external to the test chamber as a load.
PP&L-sponsored testing of the 1600s was completed recently at Wyle for Susquehanna's drywell environment. These samples had been thermally aged for -
185 hours0.00214 days <br />0.0514 hours <br />3.058862e-4 weeks <br />7.03925e-5 months <br /> at 248'F. Three Marathon 1600s were mounted in a spray-tight enclosure in the test chamber. Failure occurred on one of the three samples in this test during the LOCA exposure at 360*F when the samples were energized with 528 Vac for the first operability test following spray initiation. The failure mode was a short circuit between the terminals of two phases and short circuits from at least one terminal to ground on the mounting panel of the test enclosure across the insulated base of the TB.
h) IN 87-XX April XX, 1987
) Page 2 of 2 Limitorque Report No. 80119 claims qualification for five types of tbs used in Limitorque valve actuators for in-containment pressurized water reactor (PWR) plant service.
B0119 reports that two Marathon 300s, one 1600, and one each of Curtis Type "L,"
Buchanan 0222 and 0524, and General Electric EB-5 were thermally aged at 280 F for 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />. The peak temperature of the LOCA profile was 312 F (maintained for approximately 30 minutes). Review of test results reveal that only one of the Marathon 300s was powered with 480 Yac for operability testing (the others were not powered during the LOCA test). Consequently, actuator performance during the LOCA was not demonstrated for all of the tbs under test.
No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the Regional Administrator of the appropriate regional office or this office.
Charles E. Rossi, Director Division of Operational Events Assessment Office of Nuclear Reactor Regulation Technical
Contact:
S. D. Alexander (301)492-7480
Attachment:
List of Recently Issued Information Notices l
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l L.