ML20214U520
| ML20214U520 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 11/20/1986 |
| From: | Lagergren W, Murphy M, Russell J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20214G966 | List:
|
| References | |
| 309.01-SQN, 309.01-SQN-R02, 309.01-SQN-R2, NUDOCS 8612090296 | |
| Download: ML20214U520 (8) | |
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. TVA ENPLOYEE CONCERNS REPORT NUMBER: 309.01-SQN SPECIAL PROGRAN REPORT TYPE: Sequoyah Nuclear Plant - Element REVISION NUMBER: 2 TITLE: Adequacy of Procedure I
REASON FOR REVISION:
To incorporate TAS and SRP Consnents Revision 1 To-incorporate SQN Corrective Action Response Revision 2 i
PREPARATION PREPARED BY:
Tim Masser //-N~8b SIGNATURE DATE
, REVIEWS PEER: i
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SIGNATURE ll DATE I
coNCUm= - se CEG-Ht M // 'b SRP: emaa .
- . 20.K SIGNATURE DATE SIGNATURE
- DATE I APPROVED BY:
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ll*$0'b6 N/A DATE i ECSP NANAddR DATE MANAGER OF NUCLEAR POWER CONCURRENCE (FINAL REPORT ONLY)
- SRP Secretary's signature denotes SRP concurrences are in files.
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TENNESSEE VALLEY AUTHORITY
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SEQUOYAH NUCLEAR PLANT i
EMPLOYEE CONCERNS TASE GROUP i OPERATIONS i CEG i
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'i Subcategory: Engineering l l
l Element: Adequacy of Procedure i
.[ Report Number: 309.01-SQN Revision 2 IN-85-977-001
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f Evaluator: Tim Masser //-//-/d j Tim Nass y Date Reviewed by: I!///[24?d//
/ //-/#/-fd Date OPS CIMAlentfer Approved by: -
. Am" W. R. Ladedgren
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O Revision 2 I. ADEQUACY OF PROCEDURE This report evaluates the concern addressing the implementation of programs to identify and replace the teflon tape used on the reactor coolant system and those systems that return to the reactor coolant system at SQN. The programs and procedures must identify the location of the teflon tape and stipulate replacement with another type of acceptable tape. This program implementation has been generated by TVA management who stated that this tape replacement shall occur.
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, II. SPECIFIC EVALUATION NETHODOLOGY l
' Concern IN-85-977-001 states: "TVA management has stated that teflon tape which was used on the reactor coolant system must be identified and l replaced with another type of tape, however, no program to accomplish this task has started."
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' A review was performed of the division and plant procedures, the NSRS i
inspection report (I-85-383-WBE), the operating experience review, and associated memorandums. Supervisors, planners, and foreman were interviewed for knowledge of the use of teflon tape.
4 The above referenced NSRS report was reviewed to determine its adequacy
- and completeness with relation to the above stated SQN generic employee concern.
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j III. FIND 1NGS t
t An employee at WBN expressed a concern that management had said teflon tape was not acceptable to use at the plant, but nothing was being done to correct the problem. An Operating Experience Review (OER), SQN 850088001 was issued in February 1986, at SQN for the problem to be addressed.
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A review of the documents governing use of teflon tape was conducted.
i These are listed in the reference section of this report.
Type TFE teflon tape is generally used in applications where the temperature is less than 400*F. When the temperature exceeds this value, the properties begin to change, thus allowing the possibility of leakage.
WhenisIFE RADS, flourine teflon is used where radiation doses exceed 104 released.
DPNM73N2restrictstheuseofteflontagetoamaximumtemperatureof 300*F and a maximum radiation dose of 10 RADS. This procedure goes
' on to say that this tape is not for use on lines that re-enter the reactor system. Plant procedure SQN SQA-160 reflects the same procedure. Grafoil tape is listed as acceptable for any circumstances; however, it is not practical for use in all situations, f
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Revision 2
.The Chemical Engineering Section performed a walkdown of the reactor coolant system chemical sampling lines, the chemical volume and control system sampling lines, and the post accident sampling lines on both i
units and discovered 26 problem locations. Of the 26 two were determined to exist in locations where the temperature is greater than !
300'F and the accident condition dose rate exceeds 104 R&DS. Work i
' requests 8111371 and B113880 were initiated and worked to remove the teflon tape on the two locations identified above. The remaining 24, do
- not violate the radiation dose requirement or the temperature requirement; however, they do vloiste the requirements that specify that the tape should not be used on lines which re-enter the reactor system.
This is discussed in the OER evaluation of OER SQN 850088001.
Memorandum from Metallurgical Engineering to Nuclear Engineering and OER i SQN 850088001, I-85-383-WBN Attachment Z references testing currently j being performed to find an acceptable substitute for teflon tape. The 1
testing program being conducted by DNE, is being performed to retest existing thread sealants and quellfy other sealants for use. This testing is to take from 6 to 12 months. When the testing is complete, a walkdown will be performed to identify the areas where teflon tape is installed but is outside the scope of the experience review SQN 850088001, ,
which was generated by the WBN concern. The target date at 4
1 SQN for this work is the unit 2 cycle 4 refueling outage.
I Interviews were conducted with planners, foremen, a general foreman and an engineer. The planners, foremen and general foreman all indicated that they did not know that teflon tape had only certain acceptable applications before the areas were 4dentified to have the tape removed.
i The engineer stated that he knew it was not acceptable for certain applications and that he felt implementing procedures were not adequate ,
for controlling the tape. The planners, foreman and general foreman said that its use should be addressed in the planning of the work either 1
by a working level instruction or in the planning of the work request.
j Currently, the steamfitters have been instructed not to use teflon tape j inside the Reactor Buildings. A memorandum was issued to the general .
j foreman to direct his workers not to use the teflon tape in the Reactor Buildings. +
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The operating experience review OER SQN 850088001, provides the means by i which the testing is being conducted and tracked. When substitutes are found, this same OER will be used as the implementing device.
Currently, the Division of Nuclear Engineering (DNE) has Singleton Lab testing different thread sealants.
Conclusions:
i The areas identified as being unacceptable in the experience review. OER SQN85008001, were inspected and the tape removed. Any areas outside
- this experience review have not been identified.
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t Revision 2 A program has been established by way of operating experience review SQN 85008800lto identify and replace teflon tape which is located in unacceptable applications. The problem of preventing recurrence has not lR1 been specifically addressed. Although SQN has a standard practice which i specifies when teflon tape can be used, this has proven ineffective.
i Based on the findings, the concern that no program has been established to identify and replace the teflon tape is not valid at this time.
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j Program has been established by management to locale the remaining unacceptable areas, which were outside the scope of the experience i review from WBN, and replace the tape with acceptable substitutes. The i target date for this implementation is the unit 2 cycle 4 refueling outage.
L To prevent teflon tape reinstallation in the unacceptable locations, l plant personnel must be familiar with its acceptable uses. I Implementing procedures should be initiated which address what thread lR1 sealants can be used and the application restrictions of its use. l 7
9 In light of what the concern says, this concern was valid at the time of l the concern; however, corrective action has been implemented and teflon l tape has been removed from the identified areas.
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( Based on the findings there are no safety-related issues related to this concern. I I
1 IV. ROOT CAUSE
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The absence of implementing procedures and unfamiliarity with l SQN/SQA-160 requirements aided in the misapplication of teflon IR1 tape and could cause the recurrence of these misapplications. l 1
V. GENERIC APPLICABILITY y
j This concern has been determined to be applicable to all TVA nuclear plants. Because of the findings cited, these conditions could exist at
- other plants.
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Page 3 of 5
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. l ,en Revision 2 . ,_
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VI. References %t g -
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- 1. DPM Division Procedure Manual N73H2, Section 4.N.1.1. (Rg),
January 24, 1985 , C;
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- 3. NSRS Inspection Report I-85-383-WBN,'tiar.'ed Octobe 10, 1985',.
contained in OER SQN 850088001 >
February 18, 1986 -
) 5. Unimplemented Design Item Evaluation, fron'H. L. Jones,' Nuclear 1.ead j Engineer to SQEP Project Files dated June 2, 1986, (825 860620 002) t
- 6. Memorandum from E.E. Cooper, Metallurgical Engineer to Nuclear Engineering Branch Files Use of Pipe (" Teflon") Tepe at TVA Nuclear Plants, dated April 18, 1986, (545 860418 251) .
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- 7. Nemorandum from C.R. Brimer, Manager C1'te Services to B. N. ,
Patterson, Maintenance Superintendent, "Sequoyah Nuclear Plant -
Justification for Continued Operation for Teflon Tape Presently ,
l Installed," dated April 18,1986, (801 860716 931)
- 8. Nemorandum from C.R. Brimer, Manager Site Services to P. 2. Wallace,' -
Plant Manager, " Watts Bar Nuclear Plant - Review of,0perating - ,
Experience Review Item No. I-85-383-WBN," dated FeLenary 19, 18)86.
(801 860219 834)
I 9. Memorandum from J. C. Standifer, Project Manager, Watts Bar. '
. Engineering Project to G. Wadewitz, Project Manager Watts Bar
! Nuclear Plant, " Watts Bar Nuclear Plant Nonconformance Report (NCR) i No. W-231-P, Revision 0 Insppropriata use of Teflon Sealant Tape " '
- dated May 9, 1985, (D45 850509 254) ,
- 10. Memorandum from E.R. Ennis, Plant Manager, Watta Bar Wuclear Plant i to Guenter Wadewitz, Project Manager, Watt's Bar Nuclear Plant. -
" Watts Bar Nuclear Plant-Nonconformance Report, W-231-6 dated
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Nay 1, 1986, (707 850426 894) i
- 11. Memorandum from R. A. Sessons Project Manager Environmental Qualification Project to H. L. Abercronble.. Site Director, Sequoyah l Nuclear Plant, " Thread Seal'nt/
a Lubricants for Use'en Solenoid Valve Interface Connections with Airline," dated F4bruary 6, 1986, ,
(570 860206 004)
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e Revision 2 VII. IMMEDIATE AND LONG-TERM CORRECTIVE ACTION Revise SQN standard practice SQA 160 to clarify limitations of teflon i tape. Also, issue memorandum to employees who may use teflon tape I advising of the restrictions on teflon tape application. These two IR2 action items will be tracked by management action tracking system (NATs) l assignment numbers 9357 and 9356 respectively. (CATD 30901-SQN-01) l P
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REFERENCE - ECPS120J-ECPS121C TENNESSEE VALLEY AUTHORITY PAGE -
FREQUENCY - REQUEST OFFICE OF NUCLEAR POWER RUN TIME -
g OllP - ISSS - RHM EWLOYEE CONCERN PROGRAM SYSTEM (ECPS),
LIST OF EWLOYEE CONCERN INFORMATION RUN DATE ,.
CATEGORY: OP PLANT OPER. SUPPORT SUSCATE00RY: 30901 ASEGUACY OF PROCEDURES S GENERIC
- KEYWORD A O H APPL STC/MSRS P ., KEYWORD B CarlCERN SUS R PLT BBSM INVESTIGATION S CONCERN KEYHORD C i '
HUMBER CAT CAT D LOC FL03 REPORT R DESCRIPTION "KEYNORD I i
IN 977-001 OP 30901 N NSN YYYY I-85-343-MSN NS TV4 MANAGEMENT .'iAS STATED THAT TEFLO HONCONFORMANCE T50112 REPORT N TAPE HMICN MAS USED ON THE REACTOR CORRECTIVE At COOLANT SYSTEM (RCS) MUST BE IDENTI CONSTRUCTIt g FIED AND REPLACED HITH ANOTHER TYPE TUBING OF TAPE, H0HEVER, N3 PROGRAM TO ACCD MPLISH THIS TASK HAS STARTED. CI HA S NO ADDITIONAL INFORMATION. NO FDL w g ' LON UP REQUIRED. f _,.
1 CONCERNS FOR CATEGORY OP SUBCATEGORY 30901 , -
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