ML20100P086
| ML20100P086 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/27/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Kirsch D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-84-549-000 ANPP-31129-TDS, DER-84-25, PT21-84-549, PT21-84-549-000, NUDOCS 8412130625 | |
| Download: ML20100P086 (6) | |
Text
}El'? 0 Arizona Nuclear Power Project
[ 3'4 [ { } {'t P O. BOX $2034
- PHOENIX, ARIZONA 85012 2034 November 27, 1984;,y ANPP-31129-TDS/TRE' g,.,
U. S. Nuclear Regulatory Commission Region V 1450 Maria 1.ane - Suite 210 Walnut Creek, California 94596-5368 Attentiont Mr. D. F. Kirsch, Acting Director Division of Reactor Safety and Projects
Subject:
Final Report - DER 84-25 A 50.55(e) Reportable Condition Relating To Containment Supply Registers Would Not Cycle.
File: 84-019-026; D.4.33.2 Reference A) Telephone Conversation between P. Narbut and T. Bradish on May 1, 1984 B) ANPP-29611, dated May 29, 1984 (Interim Report)
C) ANPP-30256, dated August 16, 1984 (Time Extension)
D) ANPP-30564, dated September 19, 1984 (Time Extension)
E) ANPP-30835, dated October 15, 1984 (Time Extension)
F) ANPP-30999, dated October 30, 1984 (Time Extension)
G) ANPP-31192, dated November 20, 1984 (Time Extension)
Dear Sir:
Attached is our final written report of the Reportable Deficiency under 10CFR50.55(c) referenced above.
Very Truly Yours, r
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C (ALL U Mt.L m g
E.E. Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment ces See Pagn Two 0412130625 041127 PDR ADOCK 0500052R j
a Pan s gt Ib~-))
e, Mr. D. F. Kirsch DER 84-25 Page Two cc Richard DeYoung. Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 n
T. C. Woods, Jr.
D. B. Karner W. E. Ide D. B. Fasnacht A. C. Rogers L. A. Sousa i
D. E. Fowler T. D. Shriver C. N. Russo B. 5. Kaplan J. R. Bynum J. M. Allen A. C. Gehr W. J. Stubblefield c
W. C. Bingham R. L. Patterson R. W. Welcher H. D. Foster D. R. Hawkinson R. P. Zimmerman L. Clyde M. Woods T. J. Bloom D. N. Stover J. D. Houchen J. E. Kirby D. Canady Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, CA 30339 i
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FINAL REFORT - DER 84-25 i
DEFICIENCY EVALUATION 50.55(e)
ARIt0NA FUBLIC SERVICE CONFANY (AFS)
FVNGS UNITS 1, 2, 3 I.
Description of Deficiency During receiving inspection, the containment building air supply registers failed to cycle properly. The inspection revealed that the j
tension wire used for maintaining louver (blade) adjustment f ractured during cycling. This.results in a condition where the louvers are free to move and can close, thereby blocking the supply of air to
, safety-related areas that require cooling.
This condition was documented by The Waldinger Corporation (1WC),
supplier of the air conditioning system, in References 1 and 2 The air supply registers and grilles for FVNGS air conditioning systems are manufactured by Titus Products Co. (Titus) and supplied by The Waldinger Corporation (TWC). The registers are Titus model 272 RLS and the grilles are Titus model 272 RLO.
It should be noted that an air supply stille consists of an adjustable airfoil louver 2
(blade) mounted in a frame, while an air supply register is a grille
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provided with a damper.
During a subsequent internal QA inspection by the Titus Products Co.,
it was discovered that some of the tension wires used for adjustment 1
of the blades on the grilles would not remain in place when the blades were closed.
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The deficiency discussed in this report concerne the grille portion of both the Titus model 272 RLO stilles and 272 RL5 registers.
Evaluation i
There are a total of 117 Titua quality class "Q" and."R" registers and grilles in each unit. The following is a list of affected Titus registers and ' grilles by building
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t Building Number Per Unit Aun111ery 33 Containment 65 I
Control 10 Diesel Generator 4
Fuel 5
TWC has confirmed that the tension wire failures and the tension wires not remaining in place are isolated to models 272 RLo and 272 RL5 (Reference 5).
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9 Final Report DER 84-25 Fase Two
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Titus has determined the root cause of these deficiencies t be-the
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fo11owing:
l A.
Carbon steel tension wires became brittle and susceptible to fracture due to the plating (galvanising) process used during.
fabrication.
3.
Wire retaining lances, which are tabs pressed ' out f rom the#
. register side walls, were insufficient in depth to retain the.
3 wire.
j C.
Retaining clips failed to remain intact' on louvers.
It was determined that (a) either 0.031 inch stainless st' eel'or 0.050 inch diameter carbon steel wire provided satisfactory tension, (b) a round type pushout fastener (No. FD156307) manufactured by TitW Co.
would remain intact on the~ 1ouvers, and (c) with additional fasteners,' the wire would be properly. retained by the lances (Reference 6 and 7).
II.
Analysis of Safety Implications i
If this deficiency were to have reemined uncorrected the supply of
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air to safety-related areas could have been blocked. -
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t Based on the above, this condition is evaluated as reportable under the requirements of 10CFR50.55(e): since. if this condition were to -
remain uncorrected, it would represent a significant safety condition.
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This project has siso. evaluated this condition as reportable under 10CFR Part 21 since a defect exists in a basic esoponent..This.
report addresses the reporting requirements of the regulation with L
exception of subpart (vi), 'regarding the number 'and location of sinilar components supplied to other facilities.
Titus previously notfied the NRC that the tension wires would not:
remain in place when blades were closed. The breakage of teosten i
wire has not been reported (Reference 3).
A copy of this document will.be sent to The Waldinger Corporation and '
Titus Products Company to notify them of the Part 21 reportability l
evaluation by the FYNos project.
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e, Final Report DER 84-25 Page Three III.
Corrective Action A.
The following corrective actions has been implemented by Titus to ensure future deliveries do not have these problems (Reference 5):
1.
Future fabrications will use the TRW Fastener No. PD156307 to restrain the tension wire.
2.
Tension wires will be installed af ter the registers have been plated.
3.
Future fabrications will have either 0.031 inch stainless steel or 0.050 inch carbon steel tension wires (Note: 0.050 inch carbon steel tension wires were used in the original installations in PVNGS).
B.
The following action is being implemented to correct this condition in equipment at the jobsite 1.
The supply registers and grilles for Unita 1, 2, and 3 will be sodified per Titus field rework procedures (Retference 6).
These procedures cover (a) replacing existing aush-on lock nuts with the TRW fastener PD156307, (b) replo:ing existing tension wires with 0.031 inch diameter stainless steel tension wires and (c) adding fasteners. The 0.f 831 inch stainless steel has been selected over 0.050 inch carbon steel because it is easier to install and has superior corrosion resistance.
2.
The registers and grilles in the Unit 1 Containment building have been reworked per NCR SM-4980.
NCR SM-5128 has been initiated to rework the safety-related (Q Class) registers and grilles in the Unit 1 Control Building. The registers in the Control Building are the only safety-related registers outside containment. This work will be completed prior to fuel load.
Unit 2 registers and grilles requiring modifientions will be reworked prior to fuel load. This action is expected to be completed by April 30, 1985.
Unit 3 registers and grilles requiring modifications will be reworked prior to fuel load.
Final Report.
DER 84-25 Page Four.
F IV.
Referencee 1
Letter f rom WC to Bechtel F-WC-BPC-84-60, dated March 6,1984 1
1 2
Letter f rom WC to Bechtel F-WC-SPC-84-63, dated March 7,1984 3
Letter from Titus to NRC, dated August 7, 1984 4
Letter f rom WC to Bechtel F-WC-BCI-84-225, dated Auguet 10, 1984 5.
Letter f rom WC to Bechtel F-WC-BCI-84-309, dated october 4,1984 6
Titue Tension Wire Rework Report, Bechtel Log No.
13-10407-M598-2230 7.
Letter f rom WC to Bechtel F-WC-SPC-84-322, dated 4
October 15, 1984
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