ML20101G668
| ML20101G668 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 12/14/1984 |
| 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, REF-PT21-85-063-000 ANPP-31467-TDS, DER-84-102, PT21-85-063-000, PT21-85-63, NUDOCS 8412270596 | |
| Download: ML20101G668 (4) | |
Text
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P.O. BOX $2034
- PHOENIX, ARtZONA 85072-2034.
i December 14,1984 UdG V:' -
ANPP-31467-TDS/TRB U. S. Nuclear Regulatory Commission Region V 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. D. F. Kirsch, Acting Director Division of Reactor Safety and Projects
Subject:
Final Report - DER 84-102 A 50.55(e) Reportable Condition Relating To Anchor / Darling Check Valves, i
File: 84-019-026; D.4.33.2
Reference:
A) Telephone Conversation between L. Miller and L. Spiers on December 7,1984
Dear Sir:
Attached is our final written report of the Reportable Deficiency under 10CFR50.55(e) referenced above.
Very truly yours, f
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E. E. Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment cc: _ See Page Two 8412270596 841214 PDR ADOCK 05000528 s
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Richard DeYoung, Director Office of Inspection and Enforcement t
.U. S. Nuclear Regulatory Commission Washington, D. C.
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..c FINAL REPORT - DER 84-102 DEFICIENCY EVALUATION 50.55(e) h" ARIZONA PUBLIC SERVICE COMPANY (APS)
.PVNGS UNITS'1, 2, 3 J
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Description of Deficiency 91
' Investigation Request IR-37 was initiated to perform a. site inspection of Anchor / Darling (AD) swing check valves for missing tack.
welds per DER 82-33. The following two deficiencies were identified during the course of this investigation.
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In valves 1PAFAV005 and IPAFBV022, the' set screw was not tight cM ',,
enough against the.hingerpin" causing a condition wherein the hinge pin is able to slide through the hinge support. AD swing check valves require a set screw to be tack welded to.the hinge
-support to prevent the hinge pin from becoming disengaged from the hinga. support.
2.
In valves 1PCTAV037, 1PCTBV038, 1PCTAV016, and 1PCTBV020, the disc nut pin was not tack welded to the dise nut. The disc nut pin is required to be tack welded to the disc nut to provide a positive attachment of the disc.
Evaluation The root cause of both the~ above conditions is attributed to errors during assembly of the valves prior to delivery to the site. Bechtel discussed the above conditions with AD and both agreed that either
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condition:1 or 2 could make the valve inoperable. The valve could M sak.at back flow, disengaged parts could restrict the flow through the valve small and/or small disengar,ed. parts could flow through the e-(
system' causing damage to other equipment.
Had this deficiency remained uncorrected, check valves in various saft ty-related systems including Aniliary Feedwater could have
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. fail'ed, thereby precluding r,afety-related systems from performing k
essential functions.
'N II.
Analysis of Safety Implications 4
3 Based on the above, this condition is evaluated as reportable under i
'the requirements of 10CFR50.55(e);;since, if this condition were to
. remain uncorrected,. it would reprgsent a significant safety condition.
N i,.(hisprojecthasalsoevaluatedthisconditionasreportableunder
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"the-requirements of 10CFR Part 21. This'riport addresses the.
' reporting requirement of the regulation with the exception of subpart c'
(vi), regarding the number and' location of such components supplied to other facilities.
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Final Report DER 84-102
- Page Two-III.
Corrective Action 1.
Attached is the list of AD swing' check. valves used in Unit 1.
aAll the Unit 1 listed valves are being inspected and documented on special CIP 592.0. The defective valves will be reworked per AD's direction and inspected via NCRs SM-5320, SM-5321, SM-5322, and SM-5355.
- 2. ~All CT,-FP, and SP valves in Unit 1 listed in the attachment will be inspected and reworked as required prior to entry into Mode 6.
The remaining' valves will be inspected prior to Mode 4.
3.
Units 2 and 3 will be inspected and reworked as required by IR-48.
Special CIPs 592.0, 606.0, and 607.0 have beea initiated:
to cover the defects (locse hinge pin and missing tack weiding on the disc unit) as identified in Section I of this DER and also the defect (missing tack welding on the set screw) previously identified on DER 82-33. Any subsequent required NCRs shall cross-reference this DER for reportability disposition. This action will be completed prior to operating license for each unit.
4.
The supplier drawings listed below have been revised by issuance of Supplier Document Change Notices (SDCN) to show staking at three places as an alternative to tack welding of the set screw.
SDCN #
Bechtel Log #
02485 P221B-101-8 02486 P221B-145-5 02487 P221B-57-5 4
02488 P221B-146-4 02489 P221B-147-3 02490 P221B-322-4 02491 P221B-88-1 02492 P221B-73-5 5.
A copy of this report will bc transmitted to AD in compliance l
with 10CFR Part 21.
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