ML20132C194
| ML20132C194 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/03/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-85, REF-PT21-85-438-000 NCR-BLN-4430, PT21-85-438, PT21-85-438-000, NUDOCS 8509260479 | |
| Download: ML20132C194 (2) | |
Text
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e TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 37 Qf 400 Chestnut Street Tower II
- 9.
September 3, 1985 BLRD-50-438/85-23 BLRD-50-439/85-21 U.S. Nuclear Regulatory Commission Region II Attn:
Dr. J.-Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Dr. Grace:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - SOLID STATE CONTROL SYSTEM CABINET WIRING WAS DAMAGED DUE TO TARGET ROCK SOLENOID WIRING AND DRAWING ERROR.
- BLRD-50-438/85-23 BLRD-50-439/85 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector Al Ignatonis on August 1, 1985 in accordance with 10 CFR 50.55(e) as NCR 4430. Enclosed is our first interim report. We expect to submit our next report'on or about May 9, 1986. We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, SEE VALLEY AUTHORITY J. W. Hufham, Manager Licensing and Risk Protection Enclosure cc:
Mr. James Taylor, Director (Enclosure).
Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 s
8509260479 850903 PDR ADOCK 05000438 1
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An Equal Opportunity Employer l
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O ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 SOLID-STATE CONTROL SYSTEM CABINET WIRING WAS DAMAGED DUE TO TARGET ROCK SOLENOID WIRING AND DRAWING ERRORS BLRD-50-438/85-23, BLRD-50-439/85-21
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NCR BLN 4430 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency Internal wiring in solid-state control system (SSCS) cabinet IIX-IR-017A was damaged when a 120V ac potential was applied to at least two different field input points of the cabinet. The SSCS was designed for a 48V de input. The inputs involved were from Target Rock (East Farmington, New York) solenoid valves which are controlled by the SSCS. An internal jumper in the Target Rock valves supplied one side of the 120V ac signal (used to energize the solenoid) to the valve position limit saitch terminals. On some valves,. the 120V ac signal is used to energize local indicating lamps which require the use of an internal jumper; but when the position switches are connected as SSCS inputs, the internal jumper must be omitted.
The root causes of this deficiency were (1) Target Rock supplied a solenoid valve with an internal jumper which was not depicted on their drawings, and (2) TVA failed to specify the removal of some of the internal jumpers that were shown on Target Rock's valve drawings.
Interim Progress TVA is in-the process of evaluating this deficiency in order to determine corrective action and action required to prevent recurrence.
Additional information will be provided to the NRC on or about May 9,1986.
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