ML20024D177
| ML20024D177 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 07/19/1983 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Sterber D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ANPP-27345-BSK, DER-83-17, NUDOCS 8308030271 | |
| Download: ML20024D177 (6) | |
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f!50 Arizona Public Service Company P.O. BOX 21666. PHOENIX, ARIZONA 85036 f.
Jiff p 7 FM I2: 39 July 19, 1983 ANPP-27345-BSK/RQT ggg>.m...l,-e
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U. S. Nuclear Regulatory Commission 3egion V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. D. M. Sternberg, Chief Reactor Projects Branch 1
Subject:
Final Report - DER 83-17 A 50.55(e) Reportable Condition Relating to Fire Protection Switches By ITE Gould Failed to Meet The Requirements of TMI Task 18A File: 83-019-026; D.4.33.2
Reference:
A) Telephone Conversation between P. Narbut and R. Tucker on March 4, 1983 B) ANPP-23560, dated April 21, 1983
Dear Sir:
Attached is our final written report of the Reportable Deficiency under 10CFR50.55(e), referenced above.
Very truly yours, f
CRC O
O E. E. Van Brunt, Jr.
APS Vice President, Nuclear Projects Management ANPP Project Director EEVBJr./RQT:rb Enclosure cc:
See Page 2 8308030271 830719 PDR ADOCK 05000529 PDR S
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Page 2 cc: - Richard DeYoung, Director-Office.of Inspection and Enforcement
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U. S. Nuclear Regulatory Commission Washington, D. C.-20555 T. G. Woods, Jr.
G. C. Andognini J. A. Roedel D. B. Fasnacht A. C. Rogers B. S. Kaplan W. E. Ide J. Vorees J. R. Bynum P. P. Klute/D. D.' Green A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen G. A. Fiorelli S. R. Frost J. Self Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway - Suite 1500 Atlanta, Georgia 30339 i
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FINAL REPORT - DER 83-17 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNIT 2 I.
Description of Deficiency During a Quality Control inspection of a Bechtel modification to PVNGS Unit 2 load centers, RL pushbutton switches on the load centers were observed to be broken, cracked and detached. The load centers, supplied by Brown Boveri Electric (BBE), were provided with RL pushbutton switches by. BBE for local load center activation. A subsequent modification was performed by'Bechtel per Design Change Package (DCP) 2CE-ZJ-045 to establish compliance with TMI Task 18A. This task requires incorporation of additional RL pushbutton switches and disconnect switches on the load centers to disconnect devices controlled on the Main Control Board from the second point of control. The additional RL switches provide local control at the load centers to accomplish a hot shutdown due to a postulated fire in the control room.
RL switches installed by both BBE and Bechtel were found to be identically damaged. Bechtel corresponded witt BBE concerning the condition and Bechtel concurs with the BBE disposition, as contained in the attached letter, the damage was the direct result of overtorquing the switch contact termination screws. The contact connection consists of a small slotted head screw and matching lug molded into the plastic body of the switch. There is no specific torque specified for this terminal and, as indicated by the attached BBE letter, care must be exercised when installing small parts such as this to avoid stripping and/or fracturing the molded plastic parts. The cause is therefore attributed to overtorquing which happened either during completion of the DCP or during prerequisite startup activities which checks terminations for tightness and was being performed about the same time as the DCP.
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" Final Report
. DER 83 -
.Page 2 A subsequent 100% inspection-of Unit 2 load centers has identified the following as having damaged RL push button switches:
2E-PGA-L33C2 2E-PGB-L32B2 2E-PCG-L34C2 4
L33C3 L32C2 L36B2 L35C2 L32C3 L36C2 L35C3 L32C4 L36D2 L35D2 L34B2 L36D4 L35D3 L34B3 Additional inspections in Units 1 and 3 indicate the problem to be isolated to Unit-2.
II.
Analysis of Safety Implications The damaged / broken switches could cause deenergization of Class IE 480V Motor Control Centers, precluding use of safety related 2
equipment.
The subject deficie'cy is thus evaluated as reportable-n under the requirements of 10CFR50.55(e) since, if left uncorrected, it could adversely affect the safety of operations of the plant during the lifetime of the plant and it represents significant damage to a component.
III.
CORRECTIVE ACTION 1.
Startup NCR SE-1981, which' includes the previous Bechtel Construction NCR's, has been dispositioned to replace all the damaged switches found in Unit 2.
Completion of this work was accomplished without damage to any of the replacement switches.-
2.
To preclude recurrence, a copy of this report will be sent to the Startup Manager and Construction Manager for use in instructing personnel that care must be exercised when installing and/or checking small electrical components.
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..w e-Brown Boveri Electric, Inc.
i m cos,1c osy 33_1, Manufacturer of I-T-E Electrical Power Equipment May 12, 1983
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I31613 Bechtel Power Corporation 1
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- 5 Terminal Annex Los Angeles CA 90060
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uma ATTN: Mr. W. G. Bingham mac i Project Engineering Manager
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SUBJECT:
Arizona Nuclear Power Project
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i Bechtel P.O. 10407-13-EM-017 BBEL S.O. 33-52187 P-"g j
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REFERENCE:
Your Letter of May 4, 1983 0,"3,55" No. B/BBEI-E-44486 iqw*:
MOC 252819 -- DER #83-17 Control Switches
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Dear Mr. Bingham.
In response to the referenced letter and my conversation with Ved Arora, I am confirming this evaluation of the four (4) damaged pushbutton switches.
As a matter of fact, I am going to quote l
verbatim the letter I received from our Mr. E. W. Rhoads, our l
Q. A. Manager.
It is as follows, and I quote:
We have reviewed the information in Bechtel DER 83-17 with respect to the RL pushbutton switches furnished in the BBE load centers to the Palo Verde Nuclear Generating Station and have concluded that there is no deficiency in the switches.
Care must be exercised by installation and checkout personnel when installing or wiring these switches.
Mounting screws or contact connections must not be be overtorqued otherwise molded plastic parts will be stripped or fractured.
We recognize that many switchgear and circuit breaker instructions specify specific high torque values to assure proper contact and operation while in some other assemblies or mounting of devices, torque values must be limited to prevent damage by overtorquing.
Many manufacturers of molded phenolic parts, using pneumatic torque tools have learned that periodic calibration of these devices is required to limit the torque values used in assembly to prevent cracking of assemblies.
173o carry Avenue, suhe 214,Sants Am.CA SDOS e M419041481
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irric a tur 10 osa 33_17 Bechtel Power Corporation Page Two May 12, 1983 The number of pushbutton switches damaged at Palo Verde does not appear to be excessive.
(end of quote)
My own personal observation has been in the past that many electricians have fairly large screwdrivers, which in fact create this problem.
Simply put a smaller screwdriver to work and this would solve the problem.
We certainly hope that the recommendation of outlined solves the problem.
Thank you very much for the actual photographs and parts so that our Q.A.
could make an accurate and clear evaulation.
Very truly yours, BROWN BOVERI ELECTRIC INC.
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R. L. Baga Sales Engineer RLB/mae 1
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