|
|---|
Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
MONTHYEARML18016A9011999-04-12012 April 1999
Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected
ML20236V3121998-07-29029 July 1998
Final Part 21 Rept Re Enterprise DSR-4 & DSRV-4 Edgs.Short Term Instability Was Found During post-installation Testing & Setup as Part of Design mod/post-work Testing Process. Different Methods Were Developed to Correct Problem
ML20248A1671998-05-22022 May 1998
Interim Part 21 Re Enterprise DSR-4 & DSRV-4 Emergency diesel.Post-installation Testing Revealed,High Em/Rfi Levels Affected New Controllers,Whereas Original Controllers Were unaffected.Follow-up Will Be Provided No Later than 980731
ML20198E0631998-01-0707 January 1998
Part 21 Rept Re Shipment by Dubose National Energy Svcs,Inc, of 40 Pieces of 4 inch,90 Degree Elbows Which Did Not Meet ASME Section II SA-234 Requirements
ML20217K5991997-08-11011 August 1997
Part 21 Interim Rept Re Fafnir S7K Bearing Discrepancies. Further Evaluation of Deviation Is Required & Will Be Completed by 971111
ML18153A1431997-06-10010 June 1997
Part 21 Rept Re Possible Machining Defect in Certain Stainless Steel Swagelok Tube Fitting Bodies.Facilities Have Been Notified About Possible Problem
ML20140G4481997-05-0101 May 1997
Part 21 Rept Re Potential Defect in Component of Dsrv & Dsr Enterprise Standby Diesel Generator Sys.Recommends That Springs Be Inspected on Periodic Basis,Such as During Refueling Outages
ML20115J3981996-07-22022 July 1996
Interim Part 21 Rept Re 3/4 Schedule 80 Pipe Furnished to Consolidated Power Supply.Investigation Revealed Only One Nuclear Customer Involved in Sale of Matl
ML20115D2001996-07-0909 July 1996
Part 21 Rept Re Mfg Defect of Enterprise DSR-4 & DSRV-4 Edgs,Originally Mfg by Calcon Corp.Amot Control Corp Purchased Calcon Product Line & Maintains Design & Production.Valves Returned to Cooper Energy Svcs on 960131
ML20117G4641996-05-14014 May 1996
Part 21 Rept Re Cooper Bessemer Reciprocating Products,Div of Cooper Cameron Corp,Issued Ltr to Define Utils/Plants Containing Similar Equipment as Supplied on Cooper Bessemer Ksv & Enterprise Dsr EDGs
ML20100L7411996-02-29029 February 1996
Final Part 21 Rept Re Fan Motor Bearing Indications,Updating Status of Evaluation of Deviation.Bearings for Unit 2 Fcus Inspected & No Linear Indications Noted.Unit 1 Fcu Bearings Will Be Inspected Prior to Upcoming Refueling Outage
ML20097A5641996-01-31031 January 1996
Final Part 21 Rept Re Ball Valves Supplied by Cardinal Industrial Products Containing Suspect Pressure Boundary Bolting.Valves Containing Suspect Bolts Returned to Canadian Worcester Controls Ltd to Have Bolting Replaced
TXX-9603, Interim Part 21 Rept Re Linear Indication on Fan Motor Bearings Mfg by Fafnir.Bearings Provided as Spares for Four UPS Room Fan Coil Units.Further Evaluation Required & Evaluation Will Be Completed by 9602291996-01-29029 January 1996
Interim Part 21 Rept Re Linear Indication on Fan Motor Bearings Mfg by Fafnir.Bearings Provided as Spares for Four UPS Room Fan Coil Units.Further Evaluation Required & Evaluation Will Be Completed by 960229
ML20092H3641995-09-13013 September 1995
Part 21 Rept Re 3/4 Inch ASME Section III Class 2 Ball Valves Supplied by Canadian Worcester Controls Ltd (Cwcl)
ML20064G3391994-03-0707 March 1994
Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller,Supplied for Installation at Comanche Peak & Yonggwang Nuclear Power Plant,Units 3 & 4.Two Filter Capacitors Added to Design
ML20064G3261994-03-0707 March 1994
Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller Supplied for Installation at Comanche Peak.Design Corrected Through Engineering Change Order Adding Two Filter Capacitors
ML20064G3441994-03-0707 March 1994
Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller Supplied for Installation at Comanche Peak.Design Corrected Through Engineering Change Order Adding Two Filter Capacitors
ML20063K6791994-02-16016 February 1994
Part 21 Rept Re Failed Bolting on Pacific Air Products Co Gravity Dampers.Failed Bolts Replaced W/Higher Strength Bolts
ML20058K3841993-12-0909 December 1993
Part 21 Rept Re Potential Defect in Component of Dsrv & Dsr Enterprise Standby DG Sys,Regarding Potential Problem W/ Subcover Assembled Atop Power Head
ML20059A7181993-10-19019 October 1993
Part 21 Rept Re Defective Rocker Arms Supplied to TU & Clei. Rocker Arms Machined & Inspected to Incorrect Print & Discovered at Tu.Defective Rocker Arms Recalled from Nuclear Customers.No Corrective Action Required at Respective Utils
ML20024H8341993-08-19019 August 1993
Part 21 Rept Re Potential Problem W/Installation of Bushing in gear-type,3 Gpm,Oil Pump Used in Refrigerant Compressors, Mfg by Dunham-Bush.CVI Will Call for Hold Point in Fabrication Process Where Bushing Installed
ML20012G3261993-02-18018 February 1993
Part 21 Rept Re Borg-Warner Bolted Bonnet Swing Check Valve Failing to Close During Preoperational Testing.Caused by Internal Body Wall Protrusions Resulting from Intersecting Machine Bores.Design Mods Will Be Implemented
ML20128M7821993-02-12012 February 1993
Part 21 Rept Re Failure of 4-inch,150 Bolted Bonnet Swing Check Valve 2CC-0697 to Fully Close During Preoperational Testing.Disc Design Mod Installed.New Disc Component Should Be Installed or Existing Disc Refurbished
ML20127P6151993-01-22022 January 1993
Final Deficiency Rept CP-92-019 Re Steam Leak Discovered in Train a RHR Pump Casing Gasket & Seal on 920729.No Apparent Damage to Seal Noted.Item Not Reportable Per 10CFR50.55(e) or Part 21
ML20127L4661993-01-20020 January 1993
Suppl to Final Deficiency Rept CP-89-015,provided on 921130 Re Check Valves 2CC-0693 & 2CC-0697 Failure to Close on 921201.Valves Reworked & Retested Satisfactorily.Supplier Bw/Ip Advised of Test Failures,Cause & Corrective Actions
ML20127H2301993-01-15015 January 1993
Part 21 Rept Re Potential Defeat in Component of Dsrv & Dsr Enterprise Standby DG Sys.Starting Air Distributor Housing Assemblies Installed as Replacement Parts at Listed Sites
ML20127A1201993-01-0808 January 1993
Supplemental Deficiency Rept CP-92-004 Re Mfg Defects in Printed Circuit Boards for Elgar Class 1E Electric Power Inverters.Initially Reported on 920513.Baseline Data Established for Each Printed Circuit Board
ML20127C2191993-01-0707 January 1993
Supplemental Deficiency Rept CP-92-010 & Final Deficiency Rept CP-92-020 Re Cracks in Containment Spray Pump Suction Vent Piping,Initially Reported on 920722 & 1204, Respectively.Unacceptable Configurations Modified
TXX-9263, Interim Deficiency Rept CP-92-020 Re Cracks in Containment Spray Sys.Initially Reported on 921204.Detailed Rept Will Be Submitted by 9301111993-01-0404 January 1993
Interim Deficiency Rept CP-92-020 Re Cracks in Containment Spray Sys.Initially Reported on 921204.Detailed Rept Will Be Submitted by 930111
ML20126J5961992-12-31031 December 1992
Part 21 Rept Re Potential Loss of RHR Cooling During Nozzle Dam Removal.Nozzle Dams May Create Trapped Air Column Behind Cold Leg Nozzle Dam.Mod to Nozzle Dams Currently Underway. Ltrs to Affected Utils Encl
TXX-9262, Suppl to Final Deficiency Rept CP-87-122 Re Overstress Condition in Various Equipment Nozzles.Initially Reported on 871125.Nozzle Loads Specified for Applicable Equipment Qualified & within Stress Limits Specified in FSAR1992-12-31031 December 1992
Suppl to Final Deficiency Rept CP-87-122 Re Overstress Condition in Various Equipment Nozzles.Initially Reported on 871125.Nozzle Loads Specified for Applicable Equipment Qualified & within Stress Limits Specified in FSAR
ML20126E1551992-12-22022 December 1992
Supplemental Deficiency Rept CP-92-007 on QA Program Breakdown of Kranco,Inc Re Parts for Polar Crane Supplied W/O Dedicated QA Program.Initially Reported on 920814.Util Will Not Utilize Supplied Components for Critical Lifts
ML20126C7691992-12-18018 December 1992
Final Deficiency Rept CP-92-018 Re Steam Leak Discovered in 3-inch Schedule 80 Lateral Installed SG Blowdown Sys. Initially Reported on 920729.Caused by Porosity in Initial Casting.Item Not Reportable Per 10CFR50.55(e) or Part 21
ML20125D5431992-12-11011 December 1992
Final Deficiency Rept CP-92-016 Re Stems on Borg-Warner manually-operated 3-inch Gates Valves Separating from Disks. Initially Reported on 920911.Addl Administrative Controls Will Be Implemented to Prevent Inadvertent Damage
ML20125D3871992-12-0808 December 1992
Interim Deficiency Rept CP-92-019:on 920729,steam Leak Discovered in Train a RHR Pump Casing Gasket & Seal During Hot Functional Testing.Deviation Being Evaluated.Evaluation Will Be Complete by 930125
ML20125A9511992-12-0404 December 1992
Part 21 Rept,Providing Major Milestone Schedule & Portions of Part 21 Open Items List of Issues Currently in Review
TXX-9253, Final Deficiency Rept CP-89-015 Re Backleakage Through AFW Check Valves Supplied by Bw/Ip Intl,Inc.Initially Reported on 890519 & Documented in Insp Rept 50-446/92-25. Check Valves Will Be Inspected Prior to Fuel Load1992-11-25025 November 1992
Final Deficiency Rept CP-89-015 Re Backleakage Through AFW Check Valves Supplied by Bw/Ip Intl,Inc.Initially Reported on 890519 & Documented in Insp Rept 50-446/92-25. Check Valves Will Be Inspected Prior to Fuel Load
ML20116E2991992-11-0303 November 1992
Part 21 Rept Forwarding CPSES Major Milestone Schedule & Portions of Part 21 Open Items List of Issues That Are Currently in Review
ML20116C4631992-10-30030 October 1992
Final Deficiency Rept CP-92-08 Re Train B Diesel Generator Auxiliary Lube Oil Pump Valve.Initially Reported on 920722. All Nine Valves in Warehouse Have Been Magnetic Particle Examined
ML20116C6001992-10-30030 October 1992
Final Deficiency Rept CP-92-010 Re Containment Spray Pump Vent Weld Cracks.Initially Reported on 920722.Vent Pipe Replaced & Containment Spray Pump Vibration Being Corrected, Per Steady State Vibration Monitoring Test
ML20116D1571992-10-29029 October 1992
Final Deficiency Rept CP-92-12 Re Deviation in Several Spare ferro-resonant Transformers.Initially Reported on 920618. Caused by THD Measurement Exceeding Westinghouse Equipment Spec Criteria.Not Reportable Per 10CFR50.55(e) or Part 21
ML20115H0771992-10-20020 October 1992
Final Deficiency Rept CP-92-017 Re Improper Position of Seal Water Circulating Ring on Train a RHR Pump Supplied by Intersoll-Rand.Initially Reported on 920921.Motor Raised & Disassembled to Position Circulating Ring Properly
ML20115C1781992-10-13013 October 1992
Interim Deficiency Rept SDAR-CP-92-016,re Defect in Two Manually Operated 3 Inch Gate Valves,In Which Stems Separated from Disks & Disks Being Wedged in Seats.Initially Reported on 920911.Internals of Two Valves Replaced
TXX-9247, Final Deficiency Rept CP-86-41 Re Effect of Small Break LOCA During Mode 4 Operation.Initially Reported on 860528. Westinghouse Owners Group Program Modified to Eliminate Use of leak-before-break Methodology1992-10-0202 October 1992
Final Deficiency Rept CP-86-41 Re Effect of Small Break LOCA During Mode 4 Operation.Initially Reported on 860528. Westinghouse Owners Group Program Modified to Eliminate Use of leak-before-break Methodology
ML20106C0201992-09-28028 September 1992
Interim Deficiency Rept CP-92-018 Re 920728 Discovery of Steam Leak in 3-inch Schedule 80 Lateral Installed in Steam Blowdown Sys.Evaluation of Deviation Will Be Completed by 921112
ML20105C7951992-09-17017 September 1992
Final Deficiency Rept CP-92-015 Re GE Circuit Breaker Mounting Hardware Incorrectly Supplied & Installed.Initially Reported on 920623.Mounting Screws Will Be Replaced by 921018
ML20105B7211992-09-11011 September 1992
Final Deficiency & Part 21 Rept CP-92-13 Re Defect in Train a DG Lube Oil Pressure Regulating Valve Supplied by Delaval Engine & Compressor Div of Cooper Energy Svcs.Initially Reported on 920812.Deviation Not Reportable
ML20105B7231992-09-11011 September 1992
Final Deficiency Rept CP-92-14 Re Defect in Train B EDG Gearcase Lube Oil Supply Line Flange,Supplied by Delaval Compressor Div of Cooper Energy Svcs.Initially Reported on 920812.Shaft,impeller & Bushings Replaced
ML20127D1491992-09-0404 September 1992
Part 21 Rept Re Defect in Component of DSRV-16-4 Enterprise Standby DG Sys Jacket Water Pump Shaft.Caused by Incorrect Tapers Machined on Shaft Due to Vendor Mismatching.All Affected Shafts Recalled & Quality Insp Plans Changed
ML20114B8291992-08-28028 August 1992
Interim Deficiency Rept CP-86-41 Re Evaluation of Effect of Small Break LOCA During Mode 4 Operation.Initially Reported on 860528.Review of WCAP-12476 Not Yet Completed.Update, Providing Conclusion of Review,Will Be Submitted by 921030
1999-04-12
[Table view]
Category:TEXT-SAFETY REPORT
MONTHYEARML20217E8021999-10-0707 October 1999
CPSES Unit 1 Cycle 8 Colr
ML20217G4151999-09-30030 September 1999
Monthly Operating Repts for Sept 1999 for Cpses,Units 1 & 2
ML20212F7671999-09-24024 September 1999
SER Granting Relief Request C-4 Pursuant to 10CFR50.55a(g)(6)(i) for Unit 2,during First 10-year ISI Interval & Relief Requests B-15,B-16 & B-17 Pursuant to 10CFR50.55a(g)(6)(i)
ML20216J5701999-09-16016 September 1999
Rev 2 to CPSES Unit 2 Cycle 5 Colr
TXX-9920, Monthly Operating Repts for Aug 1999 for Cpses.With1999-08-31031 August 1999
Monthly Operating Repts for Aug 1999 for Cpses.With
ML20211M2981999-08-0606 August 1999
Rev 1 to CPSES Fuel Storage Licensing Rept, CPSES Credit for Soluble Boron & Expansion of Spent Fuel Storage Capacity, Consisting of Revised Title Page and 4-1
ML20210U4081999-07-31031 July 1999
Monthly Operating Repts for July 1999 for Cpses,Units 1 & 2
ML20210D8321999-07-23023 July 1999
Safety Evaluation Accepting Relief Requests Re Use of 1998 Edition of Subsections IWE & Iwl of ASME Code for Containment Insp
ML20209H7661999-07-15015 July 1999
Safety Evaluation Accepting GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves, for Comanche Peak Steam Electric Station,Units 1 & 2
ML20209H2721999-07-0909 July 1999
2RF04 Containment ISI Summary Rept First Interval,First Period,First Outage
ML20209H2631999-07-0909 July 1999
2RF04 ISI Summary Rept First Interval,Second Period,Second Outage
ML20209G7501999-07-0808 July 1999
SER Finding That Licensee Individual Plant Exam of External Events Complete with Regard to Info Requested by Suppl 4 to GL 88-20 & That IPEEE Results Reasonable Given Design, Operation & History of Comanche Peak Steam Electric Station
ML20196L0191999-07-0808 July 1999
Safety Evaluation Granting Request Relief B-6 (Rev 2),B-7 (Rev2),B-12,B-13,B-14 & C-9,pursuant to 10CFR50.55a(g)(6)(i).Technical Ltr Rept Also Encl
ML20210J9391999-06-30030 June 1999
CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630
ML20209G0801999-06-30030 June 1999
Monthly Operating Repts for June 1999 for Cpses,Units 1 & 2
ML20196J0621999-06-29029 June 1999
Safety Evaluation Supporting Proposed Changes to Emergency Plan Re Licenses NPF-87 & NPF-89 Respectively
ML20195G5141999-05-31031 May 1999
Monthly Operating Repts for May 1999 for Comanche Peak Steam Electric Station,Units 1 & 2.With
ML20216E0711999-05-21021 May 1999
1999 Graded Exercise - Comanche Peak Steam Electric Station
ML20206Q0091999-05-14014 May 1999
Safety Evaluation Accepting GL 92-08, Thermo-Lag 330-1 Fire Barriers, Dtd 921217,for Comanche Peak Electric Station,Unit 1
ML20206H2061999-05-0606 May 1999
SER Accepting Exemption to App K Re Leading Edge Flowmeter for Plant,Units 1 & 2
ML20196L2241999-04-30030 April 1999
Monthly Operating Repts for Apr 1999 for Cpses,Units 1 & 2
ML20205R5701999-04-14014 April 1999
Rev 6 to ER-ME-067, TU Electric Engineering Rept,Evaluation of Thermo-Lag Fire Barrier Sys
ML18016A9011999-04-12012 April 1999
Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected
ML20205J7831999-04-0101 April 1999
Rev 0 to ERX-99-001, CPSES Unit 2 Cycle 5 Colr
ML20205N3101999-03-31031 March 1999
Monthly Operating Repts for Mar 1999 for Cpses,Units 1 & 2
ML20204H6371999-02-28028 February 1999
Monthly Operating Repts for Feb 1999 for Comanche Peak Units 1 & 2
ML20205N1481999-02-28028 February 1999
Corrected Monthly Operating Rept for Feb 1999 for CPSES, Units 1 & 2
ML20203A4881999-02-0303 February 1999
Safety Evaluation Granting Requests for Relief B-3 - B-6,C-2 & C-3 for Plant,Unit 2
ML20210J9201999-02-0101 February 1999
CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802- 990201
ML20202D0101999-01-27027 January 1999
Safety Evaluation Supporting First 10-yr Interval ISI Program Plan Requests for Relief B-9,B-10 & B-11 for CPSES, Unit 1
ML20199E9961998-12-31031 December 1998
Monthly Operating Repts for Dec 1998 for Cpses,Units 1 & 2
ML20207D6091998-12-31031 December 1998
1998 Annual Operating Rept for Cpses,Units 1 & 2. with
ML20197K2371998-11-30030 November 1998
Monthly Operating Repts for Nov 1998 for Cpses,Units 1 & 2
ML20195F3161998-10-31031 October 1998
Monthly Operating Repts for Oct 1998 for Cpses,Units 1 & 2
ML20154M8841998-09-30030 September 1998
Monthly Operating Repts for Sept 1998 for Cpses,Units 1 & 2
ML20154B5741998-09-30030 September 1998
Safety Evaluation Re Licensee Response to GL 96-05, Periodic Verification of Design-Basis Capability of Safety- Related Motor-Operated Valves. Licensee Has Established Acceptable Program
ML20151W0361998-08-31031 August 1998
Monthly Operating Repts for Aug 1998 for Cpses,Units 1 & 2. with
ML20151Q1211998-08-14014 August 1998
Rev 0 to Control of Hazard Barriers
ML20237C4061998-08-14014 August 1998
Safety Evaluation Supporting Request to Implement Risk Informed IST Program
ML20237C6721998-07-31031 July 1998
Monthly Operating Repts for July 1998 for Cpses,Units 1 & 2
ML20236V3121998-07-29029 July 1998
Final Part 21 Rept Re Enterprise DSR-4 & DSRV-4 Edgs.Short Term Instability Was Found During post-installation Testing & Setup as Part of Design mod/post-work Testing Process. Different Methods Were Developed to Correct Problem
ML20236R0711998-06-30030 June 1998
Monthly Operating Repts for June 1998 for Cpses,Units 1 & 2
ML20249B2581998-05-31031 May 1998
Monthly Operating Repts for May 1998 for Cpses,Units 1 & 2
ML20248A1671998-05-22022 May 1998
Interim Part 21 Re Enterprise DSR-4 & DSRV-4 Emergency diesel.Post-installation Testing Revealed,High Em/Rfi Levels Affected New Controllers,Whereas Original Controllers Were unaffected.Follow-up Will Be Provided No Later than 980731
ML20247G3241998-04-30030 April 1998
Monthly Operating Repts for Apr 1998 for Cpses,Units 1 & 2
ML20216B8661998-04-0101 April 1998
Rev 0 to ERX-98-001, CPSES Unit 1 Cycle 7 Colr
ML20216J3061998-03-31031 March 1998
Monthly Operating Repts for Mar 1998 for Cpses,Units 1 & 2
ML20216J1861998-02-28028 February 1998
Monthly Operating Repts for Feb 1998 for Comanche Peak Steam Electric Station
ML20197A6951998-02-24024 February 1998
Inservice Insp Summary Rept,First Interval,Second Period, First Outage
ML20199J5391998-02-0202 February 1998
CPSES Commitment Matl Change Evaluation Rept 0002 for 960202-970801
1999-09-30
[Table view] |
Text
.'
NN llllllll" "llllllll L
E E Log # TXX-94042 File # 10110 7t/ELECTR/C Ref. # 10CFR 21.21 February 16, 1994 William J. Cahill, Jr.
Grump %cr President U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 FAILED BOLTING ON PACIFIC AIR PRODUCTS COMPANY GRAVITY DAMPERS 10CFR21 REPORTABLE DEFICIENCY Gentlemen:
On January 19, 1994, TU Electric notified the NRC of an issue regarding failed bolting on Pacific Air Products Company (PAPCO) gravity dampers via facsimile. Attached is the report which satisfies the reporting requirements of 10CFR21.
The report has been formatted in a manner that corresponds to the specific information requested by subparts (1) through (viii) of paragraph 21.21(c)(4) of the regulation. This is exclusive of that portion of subpart (vi) regarding names and locations of other facilities which may be affected, as this information is not known to TU Electric and subpart (viii) in its entirety regarding the advice that has been or will be given to other ,
facilities. Such advice would be dependent on the facility specific use of the subject components.
A copy of this report will be sent to Reed National Air Products, which is now the parent company of PAPCO.
Sincerely, William J. Cahill, Jr.
t GLM:bm ATTACHMENT cc: Mr. L. J. Callan, Region IV Mr. L. A. Yandell, Region IV Resident Inspectors, CPSES C
-. F 9403020022 940216 g\\
PDR ADOCK 05000445 \
g PDR 400 N. Olive Street L.B. 81 Dallas, Texas 75201
.- .. - . -- . .~ - - ..
, l'
' Attachment to TXX-94042 .
Page 1 of 6 l 10CFR21 REPORTABLE DEFICIENCY INVOLVING FAILED BOLTING ON PAPCO GRAVITY DAMPERS j
?
(i) Information supplied by:
William J. Cahill, Jr.
TU Electric <
400 North Olive Street, LB 81 l Dallas, TX 75201 :
(ii) The facility is the Comanche Peak Steam Electric Station (CPSES)
Units 1 and 2. The basic components . involved are the %-20 X %"
bolts connecting the damper blades to the shafts on diesel generator room vent fan discharge gravity dampers. j (iii) The gravity dampers containing the bolting were supplied to CPSES. -
by the manufacturer, PAPCO. J (iv) Description 1
The bolting material in question involves %" bolts, %" long, 20 - j UNC, used to attach the 16 gauge sheet metal damper blades to the :
%" diameter. shaf ts on PAPCO gravity dampers. The gravity dampers 1 are model number SL 100 BPHD-N. The bolting material is identified l
. on PAPCO drawings as commercial grade with certifications to ASTM 1 standards. l 4
Site Specific Summary During a system walkdown on October 1, 1993, it was noted that some ;
of the Unit 2 diesel generator room vent fan discharge gravity -
dampers were partially open with the associated fans off. The ,
gravity dampers open when the diesel ventilation fans start to j provide sufficient air flow to cool the diesel generator room and ;
close to prevent back flow through an idle fan. Further inspection found that five of the eight large capacity (50,000 CFM) dampers '
had at least one blade broken loose.from the shaft.due to failure of the bolts connecting the blades to the shafts. !
1 A documentation review noted two previous similar. bolt failures involving a Unit One diesel generator room. vent fan discharge gravity damper and a primary plant supply fan discharge gravity damper. All of the bolt failures were on dampers which are downstream of a high horsepower vane axial-fan'(40HP diesel generator room ventilation fans and a 60HP primary plant supply fan).
l l
< r
.. i
' Attachment to TXX-94042 t Page 2 of 6 :
(
Analysis of the failed bolts was performed by CPSES engineering in !
order to determine the cause of the failures. The analysis determined that the bolts failed in a bending mode under dynamic :
loading conditions. Some of the holes in the damper blade material ;
were oversized allowing one side of the bolt and lock washer to be !
unsupported, imparting excessive bending stresses.into the bolt. l Also, some of the bolts lacked lock washers and/or adequate !
preloading, allowing the bolts to loosen. The prying action of the damper blade during opening and closing imparted excessive bending stresses to the bolt, Based on the above, TU Electric concluded that inadequate design / manufacturing of these bolts could have resulted in i decreased air' flow from the diesel generator rooms which could have ;
rendered the diesel generators inoperable due to excessive room '
temperature. Therefore, this condition is considered a defect as defined in 10CFR21.
Site Specific Safety Implications.
l The failed bolting actually discovered on the diesel generator >
room vent fan discharge gravity dampers did not make the dampers l incapable of performing their safety function. Using the conservative assumption that all loose blades identified would become stuck in the closed position, thereby decreasing the airflow through the dampers a proportionate amount, an evaluation was
- performed which concluded that sufficient airflow would be available to maintain the diesel generator room temperatures'within ;
design limits; however, if enough blades were to have become loose due to this condition, the dampers could have been incapable of performing their safety related function.
(v) On December 14, 1993, following the completion of a failure ,
analysis to determine the root cause of the failed bolting, TU Electric identified that this condition was potentially reportable under the provisions of 10CFR21.
(vi) TU Electric has identified 92 safety related dampers, in addition to those discussed in (iv) above, which may be susceptible to failure of the bolting connecting the damper blades to the shafts.
Damper Taa No. Damper Function j i
CP1-VADPGU-03 Electrical Area Fan Cooler Fan 1-17/1-18 ,
Discharge Gravity Damper '!
CP1-VADPGU-04 Electrical Area Fan Cooler Fan 1-17/1-18 i Suction Gravity Damper CP1-VADPGU-08 Electrical Area fan Cooler Fan'l-15/1-16 Discharge Gravity Damper l
1
)
4 , _ . , . . _ _ _
_ .I
ll
=
.l
' Attachment to TXX-94042 >
Page 3 of 6 3
' Damper Tao No. Damper Function CP1-VADPGU-10 Electrical Area Fan Cooler Fan 1-15/1-16 -
Suction Gravity Damper CP1-VADPGC-23 High Pressure Chemical Feed Room Exhaust j Gravity Damper CP1-VADPGC-24 High Pressure Chemical Feed Room Supply-Gravity Damper !
CP1-VADPGC-25 High Pressure Chemical Feed Room Exhaust !
Gravity Damper _
CP1-VADPGU-38 Battery Room Exhaust Fan Discharge Gravity :f Damper CP1-VADPGU-39 Battery Room Exhaust Fan Discharge Gravity-Damper CP1-VADPGU-40 Battery Room Exhaust Fan Discharge Gravity {
Damper
- CP1-VADPGU-41 Battery Room Exhaust Fan _ Discharge Gravity '
Damper CP1-VADPGU-42 Battery Room Exhaust Fan Discharge Gravity i Damper _
CP1-VADPGU-43 Battery Room Exhaust Fan Discharge Gravity j Damper :
CP1-VADPGU-46 Diesel Generator Fuel Oil Day Tank Area Vent '
Fan Gravity Damper CPI-VADPGU-47 Diesel Generator Fuel Oil Day Tank Area Vent Fan Gravity Damper -
~CP1-VADPGU-48 Diesel Generator Room Vent' Fan Discharge Gravity Damper i CP1-VADPGU-49 Diesel Generator Room Vent Fan Discharge Gravity Damper i CP1-VADPGU-50 Diesel Generator Room Vent Fan Discharge Gravity Damper CP1-VADPGU-51 Diesel Generator Room Vent Fan Discharge ;
Gravity Damper !
CP1-VADPGU-52 Diesel Generator Room Vent Fan Discharge Gravity Damper CP1-VADPGU-53 Diesel Generator Room Vent Fan Discharge +
Gravity Damper i CP1-VADPGU-54 Diesel Generator Room Vent Fan Discharge Gravity Damper >
CP1-VADPGU-55 Diesel Generator Room Vent Fan Discharge Gravity Damper '
CP1-VADPGU-60 ' Electrical Area Fan Cooler Fan 1-17 Discharge 'l Gravity Damper CP1-VADPGU-61 Electrical Area Fan Cooler. Fan 1-18 Discharge Gravity Damper !
CP1-VADPGU-62 Electrical Area Fan Cooler Fan 1-15 Discharge )
Gravity Damper q CP1-VADPGV-63 Electrical Area fan Cooler Fan 1-16 Discharge ;
Gravity Damper
' Attachment to TXX-94042 Page 4 of 6.
Damper Tao No. Damper Function I CP2-VADPGU-03 Switchgear Room Fan Cooler Fan 2-17/2-18 Discharge Gravity Damper CP2-VADPGU-04 Switchgear Room Fan Cooler Fan 2-17/2-18 Suction Gravity Damper '
CP2-VADPGU-08 Switchgear Room Fan Cooler Fan 2-15/2-16 -
Discharge Gravity Damper I
CP2-VADPGU-10 Switchgear Room Fan Cooler Fan 2-15/2/16 Suction Gravity Damper CP2-VADPGC-22 High Pressure Chemical Feed Room Ventilation-Supply Gravity Damper CP2-VADPGC-23 High Pressure Chemical Feed Room Ventilation #
Exhaust Gravity Damper CP2-VADPGC-24 High Pressure Chemical Feed Room Ventilation :
Supply Gravity Demper ;
CP2-VADPGC-25 High Pressure Chemical Feed Room Ventilation ,
Exhaust Gravity Damper CP2-VADPGU-38 Battery Room Exhaust Fan Discharge Gravity Damper CP2-VADPGU-39 Battery Room Exhaust Fan Discharge Gravity ;
Damper CP2-VADPGU-40 Battery Room Exhaust Fan Discharge Gravity Damper CP2-VADPGU-41 Battery Room Exhaust Fan Discharge Gravity Damper CP2-VADPGU-42 Battery Room Exhaust Fan Discharge Gravity-Damper CP2-VADPGU-43 Battery Room Exhaust Fan Discharge Gravity Damper CP2-VADPGU-46 Diesel Generator Fuel Oil Day Tank Area Vent .
Fan Gravity Damper CP2-VADPGU-47 Diesel Generator Fuel Oil Day Tank Area' Vent Fan Gravity Damper CP2-VADPGU-60 Switchgear Room Fan Cooler Fan 2-17 Discharge Gravity Damper CP2-VADPGU-61 Switchgear Room Fan Cooler Fan 2-18 Discharge Gravity Damper CP2-VADPGU-62 Switchgear Room Fan Cooler Fan 2-15 Discharge Gravity Damper CP2-VADPGU-63 Switchgear Room Fan. Cooler Fan 2-16 Discharge Gravity Damper CPX-VADPGC-01 Containment Hydrogen Purge Exhaust Fan Discharge Gravity Damper CPX-VADPGU-01 Control Room Emergency Pressurization Unit Gravity Damper CPX-VADPGC-02 Containment Hydrogen Purge Exhaust Fan Discharge Gravity Damper-CPX-VADPGU-02 Control Room Emergency Pressurization Unit Gravity Damper
~
o
' Attachment to.TXX-94042 d Page 5 of 6 Damper Taa No. Damper Function CPX-VADPGU-03 Control Room Emergency Filtration Unit Gravity '!
Damper .
CPX-VADPGU-05 Control Room Air Conditioning Unit Gravity ;
Damper ,
CPX-VADPGU-06 Control Room Air Conditioning Unit Gravity .
Damper CPX-VADPGC-07 Primary Plant Vent Supply Fan Discharge ,
Gravity Damper .
CPX-VADPGC-08 Primary Plant Vent Supply Fan Discharge Gravity Damper CPX-VADPGC-09 Primary Plant Vent Supply Fan Discharge Gravity Damper _;
CPX-VADPGC-10 Primary Plant Vent Supply Fan Discharge' :
Gravity Damper CPX-VADPGC-11 Primary Plant Vent Supply Fan Discharge Gravity Damper. .i CPX-VADPGC-12 Primary Plant Vent Supply Fan Discharge Gravity Damper .
CPX-VADPGC-13 Primary Plant Vent Supply Fan Discharge Gravity Damper '
CPX-VADPGC-14 Primary Plant Vent Supply Fan Discharge Gravity Damper'-
CPX-VADPGC-15 Auxiliary Bldg. Vent Equipment Room Supply Fan Gravity Damper CPX-VADPGC-16 Auxiliary Bldg. Vent Equipment Room Supply Fan Gravity Damper CPX-VADPGC-17 Primary Plant Vent Exhaust Fan Discharge Gravity Damper CPX-VADPGU-17 Control Room Air Conditioning Unit Discharge Gravity Damper CPX-VADPGC-18 Primary Plant Vent Exhaust Fan Discharge Gravity Damper CPX-VADPGU-18 Control Room Air Conditioning Unit Discharge ,
Gravity Damper Primary Plant Vent Exhaust Fan Discharge CPX-VADPGC-19 Gravity Damper CPX-VADPGC-20 Primary Plant Vent Exhaust Fan Discharge Gravity Damper CPX-VADPGC-21 Primary Plant Vent Exhaust Fan Discharge l Gravity Damper .
CPX-VADPGC-22 Primary Plant Vent Exhaust Fan Discharge ~
Gravity Damper.
CPX-VADPGC-23 Primary Plant Vent Exhaust Fan Discharge Gravity Damper ,
i CPX-VADPGC-24 Primary Plant Vent Exhaust Fan Discharge. .
Gravity Damper- a CPX-VADPGC-25 Primary Plant Vent Exhaust Fan Discharge Gravity Damper
]
u i
_,,. i Atthchment.toTXX-94042 .
Page 6 of 6 j 4
Damper Tao No. Damper Function CPX-VADPGC-26 Primary Plant Vent Exhaust Fan Discharge Gravity Damper l CPX-VADPGC-27 Primary Plant Vent Exhaust Fan Discharge' Gravity Damper .
CPX-VADPGC-28 Primary Plant Vent Exhaust Fan Discharge 1 Gravity Damper-CPX-VADPGU-28 Control Room Exhaust Fan Discharge Gravity .
Damper CPX-VADPGC-29 Primary Plant Vent Exhaust Fan Discharge ,
Gravity Damper .
CPX-VADPGU-29 Control Room Exhaust Fan Discharge Gravity i Damper .
CPX-VADPGC-30 Primary Plant Vent Exhaust Fan Discharge ,
Gravity Damper l CPX-VADPGU-30 Control Room Kitchen and Toilet Exhaust Fan Gravity Damper -
CPX-VADPGC-31 Primary Plant Vent Exhaust Fan Discharge Gravity Damper .
CPX-VADPGU-31 Control Room Kitchen and Toilet Exhaust Fan ;'
Gravity Damper .
CPX-VADPGC-32 Primary Plant Vent Exhaust Fan Discharge ;
Gravity Damper CPX-VADPGC-33 Auxiliary Bldg. Vent Equipment Room Exhaust .
Fan Gravity Damper ;
CPX-VADPGC-34 Auxiliary Bldg. Vent Equipment Room Exhaust ,
Fan Gravity' Damper CPX-VADPGU-34 UPS Air Conditioning Unit Discharge Gravity ;
Damper . _ .
CPX-VADPGU-35 UPS Air Conditioning System Booster Fan Inlet !
Gravity Damper :
CPX-VADPGU-36 UPS Air Conditioning Unit Discharge Gravity. .;
Damper -!
CPX-VADPGU-37 UPS Air Conditioning System Booster Fan Inlet.
Gravity Damper (vii) TV Electric has replaced the failed bolts with higher strength l bolts. The Unit One diesel generator. room vent fan discharge :
gravity dampers have been inspected and no broken bolts were r identified. All of-the other safety-related gravity dampers I subject to this condition are being inspected to assure that other .!'
broken bolts do not exist. If broken bolts are identified during the inspections, the bolts will be replaced with higher strength .!
bolts. ;
(viii) Not applicable. ;
)
.
