ML20035E486
| ML20035E486 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Monticello, Davis Besse, Peach Bottom, Nine Mile Point, Palisades, Perry, Fermi, Harris, Saint Lucie, Grand Gulf, Arkansas Nuclear, Susquehanna, Prairie Island, Columbia, Seabrook, Brunswick, Limerick, Turkey Point, River Bend, Vermont Yankee, Duane Arnold, South Texas, Cook, Rancho Seco, Zimmer, Fort Saint Vrain, 05000468, Shoreham, Trojan, 05000512, 05000469  |
| Issue date: | 04/07/1993 |
| From: | Jackson A, Reffert B ASEA BROWN BOVERI, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-93 NUDOCS 9304160080 | |
| Download: ML20035E486 (9) | |
Text
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ASEA BROWN BOVERI 4/7/93 Document Control Desk US Nuclear Regulatory Commission Washington,D. C. 20555 Gentlemen, ABB Power Distribution Circuit Breaker Division has determined in recent testing that the K-4000 Circuit Breaker has failed to meet certain rating requirements based on ANSI C37.16. The attached Record of Evaluation for 10CFR Part 21, provided to the NRC January 15,1993, details specific performance values with referencu :a C37.50.
For any K-400 circuit breaker in nuclear applications, ABB Circuit Breaker Division recommends the following course of action:
- 1. Customer application engir.eering should review the application of any K-4000 circuit breaker.
- 2. If the available fault current is less than 65kA no action is required.
- 3. If the available fault current is greater than 65kA and the system configuration is one listed in item #3 of the attached Part 21 evaluation, the customer should contact ABB Circuit Breaker Division. Contact is Mr. John Saleeby, telephone 803-665-4144 x373 in the Marketing Department.
Sincerely, f
Aubrey Jackson Quality Assurance Manager Al Bill Reffen General Manager cc:
Nuclear Distribution List Wendell Jones, ABB CBD Florence, SC
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.,.e pm ABB Power T & D Company Teteranone Teefac Swnchgear Systems Dnnsion 407 323-8220 407 322-8934 -
201 Hickrren Drive Sanford. FL327718201
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A 3R BD f%B959 ASEA BROWN BOVERI RECORD OF EVALUATION FOR CFR21 Product: ABB K-4000 Circuit Breaker
- 1) Description of Deficiency ABB type K-4000 circuit breaker does not meet all requirements of rating based on ANSI C37.16, Table 1, as tested per C37.50, Table 3, tests 4, 5, and 6.
Tests 4 and 5 show satisfactory performance at 65kA and test 6 shows satisfactory performance at 8EkA.
- 2) Location /Date Testing was performed at the KEMA-Powertest laboratory in Chalfont, PA in November,1992. Manufacturing is in the ABB Power Distribution Circuit Breaker Division plant in Florence, SC.
- 3) Analysis of Safety Imolication i
in applications where rated maximum voltage may appear across a single circuit breaker pole, the arc may not be extinguished as the circuit breeker is opening.
Some examples of applications wherein this may occur are as follows:
a) Un-grounded delta source with two unintentional grounds; one on the source side of a breaker pole and one on the load side of a different pole j
(Figure 1).
I b) Corner-grounded delta source with an unintentional ground on the load side of the pole of either un-grounded phase (Figure 2).
1 ABB POWER DISTRIBUTION Circuit Breaker DMaion -
TELEFAX 1-06 & MECHANICSVILLE HIGHWAY.
(803)667-5109 P.O. BOX 100524 (803)8644520 FLORENCE. S.C. 29501 0524 UJiA.
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j c) Un-grounded Y source with two unintentional grounds; one on the source l
side of a breaker pole and one on the load side of a different pole (Figure 3).
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d) Single phase source with intentional or unintentional ground on source side l
of one breaker pole and unintentional ground on load side of the other i
breaker pole (Figure 4).
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- 4) Steps to be Considered in tne Evaluation and Personnel Assioned a) Analysis: Analysis consists of examination of arc chutes and contact.
i structures returned from the KEMA-Powertest laboratory following
-I 1
unsuccessful tests. Known principles of arc interruption and engineering j
judgment are being combined to improve the performance sufficiently to l
rneet the ANSI ratings.
b) Calculations: N/A c) -Tests: ~ Full range of interrupting tests listed in 1) above will be made after
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- x:, u.: a w arc chute modifications have been made.
d) Trip to Jo.
N/A because no failures of the nature being reported herein have beet
. municated.
e) RGA: None required at this time.
f) inspection Factory / Field: Application hould be examined when the K-4000 circuit breaker is used in the field. If any of the applications described in section 3) above exist, modifications should be made in accorcance with ABB findings.
Personnel Assigned:
Gregory Grote - Product Development Engineer Kevin Warne - Designer Robert McMaster - Consultant
- 5) Documents or Drawinas Requirina Chance Only change now contemplated is to replace a total of (5) five arc chute parts with parts described in (5) five new drawings.
- 6) Reference Documents American National Standards Institute standards as follows: ANSI C37.13, ANSI C37.16, ANSI C37.50
- 7) Corrective Action ABB has scheduled tests on the modified arc chutes in several different modes at the KEMA-Powertest laboratory in Chalfont, PA. Tests will be conducted in early February,1993.
- 8) Action to Prevent Recurrence Put successfully tested new design into production via standard er.gineering release system for revised parts and assemblies.
- 9) Conclusions a) If a particular application does not allow the conditions described in section3) above, there is no safety hazard.
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i b) Regardless of the transformer cor ctions in a particular application, a three f
phase transformer rated at 25'
' < A or less with 480 Volts secondary will i
i not produce the t fety hazard. This is because the available current will not l
exceed the c " tent for v/hich we have succecsiu! tests per section 1) above.
i
%e foll%.ng calculebons supports this conclusion:
kVA = 2500 Assumed transformer impedance (Z) = 5.75%
i Secondary Voltage = 480 VAC Assume 100% motor load contributing 4x transformer full load current to the j
magnitude of available current Full load transformer current, let = (kVA x 1000) / (E x 3%)
= 3007 Amperes Available current from transformer, IAT * !FL / Per unit Z
= 3007 /.0575 = 52,300 Amperes i
Motor contribution current, Mc = 4 x let
= 12,028 Amperes Total available current ly = IAT + Mc
= 64,350 Amperes i
(The above conservatively assumes an unlimited primary capacity )
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.hb YW W. P. Gibson Vice President, General Manager h
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Bill Bodk j
Engineering Man er
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- Arizon2 Public Sar. Co.
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Storritt, Mgr.
W. E.
Ida Pcwer Project Engineering Mail Station 4072 A. E. Ettinger, Mgr.
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N3w Hill, NC 27562 Southport, NC 28461 P.O.
Box 960 Cincinnati, OH 45201 g s
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. Commonwealth Edison Co.
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E. Riley C. Reed, V.P., Nuclear
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Angle Ev3nts Analysis Databases Grand Gulf Arkansas Nuclear One Arkansan Nuclear One P.O. Box 429 Station Route 3, Box 137G Port Gibson, MS 39150 Route 3, Box 137G Russellville, LA 72801 Russellville, LA 72801
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'Mgr. of Nuclear ManSgar of QA Sito Purchasing Supv.
Eng. Ass,urance C21 Services St. Lucie Nuclear Plant i
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P.O. BOX 1006 CHARLOTTE, NC 28201 l
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