Part 21 Report - 1995-176
ACCESSION #: 9508110084
FAX TRANSMITTAL
DRESSER-RAND
STEAM TURBINE DIVISION
WELLSVILLE, NEW YORK
Robert M. Loughlin
Tel. 716-596-3343
Fax. 716-596-3753
Date: July 26, 1995
To: NRC Operations Center Fax No. 301-816-5151
From: Robert M. Loughlin
Subject: "Verbal" Notification by facsimile of a Potential Safety
Hazard - 10 CFR Part 21 Initial Report No. 039
A copy of approved 10 CFR Part 21 Initial Report No. 039 is provided as
pages 2 through 5 of this facsimile transmittal (complete transmittal is
5 pages)
Dresser-Rand Steam Turbine Division will submit a written Final Report no
later than August 25, 1995.
Questions relating to this 10 CFR Part 21 Report may be directed to the
undersigned at 716-596-3343 or to Richard Kling at 716-596-3288.
Robert M. Loughlin
Manager - Nuclear and Navy Product Engineering
Form EF-065 NNSOP 1.2.001, Rev. 2, Page 7 of 9
Rev B Report No. 039
Nuclear NNSOP 1.2.001
INITIAL REPORT 10 CFR PART 21
REPORT OF A POTENTIAL SAFETY HAZARD
1. ISSUED TO: Date: July 19, 1995
Robert Loughlin Mgr. Navy/Nuclear Eng. File No.: F-36674A/B/C/D
Richard Kling Nuclear Product Eng. Serial
No.: T-36674A/B/C/D
Harold Paris QA Manager Type: GS2N
P. J. Hoffmann VP Engineering Ref: N/A
John Gegus VP Engineered Products
SBU Part No.: 75233A06
Peter Salvatore VP Parts and Services
Business Unit-DRSD Dwg. No./ 75233A
Rev. level: D
PREPARED BY: Richard Kling
TITLE: Supv. N/N Prod. Eng.
PART NAME: Nut-Lock-Flex Loc Reg. Height
1. DESCRIPTION OF DEFECT:
The possibility of the regular height flex loc nut part number
75233A06 not fully engaging the locking feature of threads.
See attachment #1
2. ENGINEERED EVALUATION & RECOMMENDATION:
See attached page.
Evaluation/Recommendation prepared By: Title: Date:
Approved by Mgr.-Navy/Nuclear
Product Engineering: Date:
3. DESCRIPTION, CHECK ONE
____ Yes, this constitutes a safety hazard and requires that a
report be prepared (Form NN-0002)
____ No, this does not constitute a safety hazard and does not
require any further reporting
Disposition by D-R President: Date:
RETURN TO MGR.-NAVY & NUCLEAR PRODUCT ENGINEERING
2. ENGINEERING EVALUATION & RECOMMENDATION:
To provide 100% assurance that the locking portion of a nut would be
fully engaged with threads of the mating linkage pin would require nut
FLEXLOC (thin) DRESSER-RAND part number 75232A06 as shown on attachment
#2. The regular series FLEXLOC nut does not provide full thread
engagement of the locking feature, based on nominal part dimensions as
shown on attachment # 1.
During a seismic event adverse vibration condition the locking force
could be questionable. With the thinner nut DRESSER-RAND part number
75232A06 would provide a better design because of the greater assurance
of full locking feature engagement by meeting the design requirements for
the above conditions.
Based on the information above, Product engineering has the following
recommendations.
1. This defect does constitute a safety hazard and requires
that a report be prepared.
2. Review the Terry nuclear bill of materials that call out
either of these nuts and evaluate the individual applications.
3. All nuclear customers should be made aware of this
potential defect.
Evaluation/Recommendation
Prepared by: Title: Product Eng. Date: 7-20-95
Approved by Mgr.-Navy/Nuclear
Product Engineering: Date:
Figure "ATTACHMENT #1, REGULAR NUT DRESSER-RAND P/N 75233A06
SPS-FLEXLOC
NO. 21FA616 SCALE 2:1" omitted.
Figure "ATTACHMENT #2, THIN NUT DRESSER-RAND P/N 75233A06 SPS-FLEXLOC
NO.
21FK616 SCALE 2:1" omitted.
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