ML19343D124
| ML19343D124 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/25/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81-389-000 10CFR-050.55E, 10CFR-50.55E, PT21-81-389, PT21-81-389-000, SQRD-50-328-81, NUDOCS 8104090522 | |
| Download: ML19343D124 (3) | |
Text
/ PART 21 IDENTIFICATIbN NO. f/' 3 fe?- N o C& PAW NE T//I i
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A'UPPEtENTARY DATE DISTRIBlffED ORIGINALREPORT e
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REL CYCE &
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IE FIES IEID IEFIES EES - M IE FIES AD/SG AD/ FREI AD/ROI REGIONSI,II,III,IV,V REGIONSI,II,III,IV,V REGIONS I,II,III,IV,V VENDOR BR. R-IV V500R BR, R-IV VENDOR BR. R IV l.EB / tPA FTB 5715 M'ES / FOE SS-396 NRR/ DOL A
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i PRE 1.IMINARY EVALUATION OF THE' ATTACH TES LEAD RESPONSIBILITY FOR FOLLOWJP AS SFDhN BELOW:
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400 Chestnut Street Tower II March 25, 1981 SQRD-50-328/81-19 Mr. James O'Reilly, Director Office of Inspection and Enforcement U.S.NuclearRehlatoryCommission Region II - Suite 100 101 Marietta Street Atlanta, Georgia 30393 Lear Mr. O'Reilly:
SEQUOYAH NUCLEAR PLANT UNIT 2 - GEARED LIMIT SWITCH COVERS MELTING IN
'" SCTRODYNE MOTOR-OPERATED VALVES - SQRD-50-328/81 FIRST INTERIM P2 PORT The subject deficiency was initially reported to NRC-01E Inspector R. V. Crlenjak on February 24, 1981, in accordance with 10 CFR 50.55(e) as NCR's SQN NES 8112 and 29P. Enclosed is cur first interim report. We expect to sub:::it our next repcrt by April 10,1cB1. We consider 10 CFR 21 applicable to this deficient' If you have any questions, please get in touch with D. L. Lamb ~ert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager i
Nuclear Regulation and Safety Enclosure l
cc:
It. Victor Stello, Director (Enclosure) *'
i Office of Inspection and Enforcement i
U.S. Nuclear Regulatory Ceccission l
Washington, DC 20555 l
An Ecual Opportunity E-p O'/er l
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6 ENCLOSURE SEQUOYAE NUCLEAR PLANT UNIT 2 GEARED LIMIT SWITCH COVERS MELTING IN ELETIP.0 DYNE MOTOR-OPERATED VALVES SQRD-50-328/81-13 10 CFR 50.55(e)
FIRST IlfrERIM REPORT.
Descr otion of Deficiency Geared limit switch ousings in Electrodyne valve motor-operators have been damaged from heat due to the placement of the resistive-type heater in the limit switch compartment. The purpose of the heaters is to prevent moisture from condensing in the compartment. The geared 111mit switch housings that are damaged from heat separate the limit switch compartment from the gear train.
The gears of some motor operators showed evide'nce of excess beat, but none were found to be inoperable. The affected valves,are located in the Component Cooling Water (CCS) and Essential Raw Coollng Water (ERCW) Systems. There are 40 Electrodyne motor operators in the _ unit 2 portion of the systems and 17 in the' portion of the systems common to units 1 and 2.
Interi= Progress TVA's Division of Nuclear Power (NUC PR) personnel at the Sequoyah Nuclear Plant sits-havs been removing the heaters from the limit switch compartments of the motor operators and have been inspecting the limit switch assemblies for. damage. The manufacturer of the Electrodyne motor-operators, Foxboro-Jordan of Milwaukee,. Wisconsin, has been notified 'of the problem and has supplied TVA with additional geared limit switch -
assemblies. Limit switch assemblies found to be damaged are being replaced. ^ The NUC PR personnel have removed the heaters and inspected the limit switch ' assemblies on all of the motor operators.
All but two of the limit switch asse'mblies found to be damaged have been replaced. The two that are lef.t will be replaced before unit 2 fuel loading.
The motor-opera', ors in question were supplied under a general piping contract with NAVCO. TVA has asked Westinghouse to determine if any Electrodyne motor-operators have been supplied on the NSSS contract.
Westinghouse has verbally confirmed that none have been supplied.
TVA's Division of Engineering Design (EN DES) is evaluating the need for the heaters and has not yet decided whether to leave out the heaters altogether or replace them with smaller heaters.
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