ML20052C240
| ML20052C240 | |
| Person / Time | |
|---|---|
| Site: | Barnwell File:Allied-General Nuclear Services icon.png |
| Issue date: | 04/19/1982 |
| From: | Buckham J ALLIED GENERAL NUCLEAR SERVICES |
| To: | Coryell G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| EVP-82-57, RO-50-332-82-5, NUDOCS 8205040526 | |
| Download: ML20052C240 (2) | |
Text
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,hiucleor SeMCes EVP/82/57 3
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US Nuclear Regulatory Commission d
c Region II 101 Marietta Street, NW I;
Suite 3100
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Atlanta, Georgia 30303
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Attn:
G. P. Coryell, Fuel Facilities Inspector je Docket No. 50-332; License No. CPCSF-4
Subject:
AGNS Event Repnrt 50-332-82-5 Gentlemen:
During your recent inspection of our facility, the subject event report was discussed.
It was agreed that AGNS would notify the Comission of the defect discovered as the cause of the event.
The attached " Defect Notification Report" provides the details to enable the origination of an NRC Information Notice.
Sincerely, 963welk%
. A. Buckham JAB /MLR/wcc Attachment l
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0 m C1 A f P.:,1 K 8205040526 020419 h1h PDR ADOCK 05000332 S
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Fbst Ortm Box 847 Borruell. South codino 29812 (803)25N711
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DEFECT NOTIFICATION REPORT Ref: AGNS Event Report No. 50-332-82-5: "Short and Damage to 70GM7908 Breaker" Description of Circumstances:
On February 24, 1982, Allied-General Nuclear Services' Separations Facility was conducting checkout operations requiring routine startup of the 76 F closed-loop cooling water system to leak check the 76 F closed-loop cooling water heat exchanger after completion of repairs. The system had been in operation approximately ten minutes when the coolant pump (Pump A) automatically shut down. When restart of Pump A failed, the operator elected to start Pump B, a redundant pump identical to Pump A.
When 70GM7908 circuit / starter was closed, the preliminary step to starting the pump, the anomaly occurred. Sparks, smoke, and a loud " bang" came from the breaker / starter panel.
The breaker was immediately opened and no further attempts were made to operate either pump.
Corrective Action:
The Electrical Department Supervisor was summoned to investigate and determine if the breakers / starters were in a safe electrical configuration. Both breakers were locked open and danger tagged by operations personnel.
Inspection of the Pump B breaker revealed that a metal tag normally affixed to the control power transformer by adhesive had separated from it and fallen across the phase conductors of the motorstarter, thus, providing the electrical fault.
Inspection of other identical breakers / starters revealed some with tags remaining affixed and some unaffixed and within the enclosure.
The apparent cause of the metal tags coming off the cases was the deterioration of the adhesive and loss of its bonding qualities.
To preclude reoccurrence of this event, all existing transformer nomenclature plates were removed and fastened by mechanical means to the outside bottom of the enclosure.
Identification of Equipment / Components:
The following is a list of the Control Power Transformers (CPTs) that are in use at AGNS and had the nameplate problems.
- 1. Hevi-Duty Electric CPT, 50 VA (.050 KVA); H-D Type SZ0; 55oC Rise; 50/60 Hertz; Number 047649; Nelson I.D. #B961.102
- 2. Hevi-Duty Electric CPT; 150 VA (.150 KVA); H-D Type SZ0; 55oC Rise; 50/60 Hertz; Number 047646; Nelson I.D. #B961.104.10 (Specific Item: Equipment Number 70GM7908 breaker /startercomponent)
- 4. Also found was a power panel transformer. The same type nameplate had fallen off:
Hevi-Duty Electric 3.0 KVA; H-D Type SZ0; 55oC Rise; 50/60 riertz; Number 2435116T00; 480/240 to 240/120 Volts The CPT 25 VA transformers used on size 5 starters do not have nameplates. -The data is stenciled on them. The CPTs supplied in all breakers / starters in the motor control centers are components manufactured by Hevi-Duty Electric, a Division of Sola Basic Industries,-Goldsboro, North Carolina.
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