ML20153A977
| ML20153A977 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/11/1988 |
| From: | NRC OFFICE OF SPECIAL PROJECTS |
| To: | |
| Shared Package | |
| ML20127A683 | List:
|
| References | |
| NUDOCS 8803210317 | |
| Download: ML20153A977 (4) | |
Text
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& MQvgk UNITED STATES
! ) 3,- f g NUCLEAR REGULATORY COMMISSION 9 l WASHING TON, O. C. 20S55 k...../
SAFETY EVALUATION REPORT BY THE OFFICE OF SPECIAL PROJECTS EMPLOYEE CONCERN ELEMENT REPORT 17303 "INSTRUMENT LINE CLAMPS" TENNESSEE VALLEY AUTHORITY SE0VOYAH NUCLEAR POWER PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-32_8 I.
SUBJECT:
Category:
Construction (10,000)
Subcategory:
Instrument line installation as related to construction (17,300)
Element:
Instrument Line Clamps (17,303)
Emoloyee Concern:
IN-85-016-003 EX-85-047-001 The basis for Element Report 17303, Revision 3, prepared January 12, 1987 are two employee concerns on Watts Bar.
One cn'ncern states, "Unit 1, Elevation 676, 3/4-inch pipe clamps have been used in place of the required 1/2-inch pipe clamps, in instrument panel applications.
Concerned individual (CI) has been told by other personnel that this type of substitution had been done throughout the plant." The other ccncern states, "tubing not clamped properly.
This is a site-wide condition.
Tube 3/8-inch outside diameter stainless steel instrument lines, Units 1.
Clamps are bent, crooked, tight or loose.
Condition was noticed about a year ago."
II.
SUPMARY OF ISSUE The issue raised by this element is that instrument line clamps were either improperly installed and/or damaged during or after installation.
Some instrument line clamps are missing altogether.
Unacceptable clamp substitu-tions were made in local instrument panel application.
TVA evaluated these concerns at Watts Bar and determined to be potentially generic to Sequoyah.
III. EVALUATION The staff has reviewed the TVA employee concern.
The TVA report identified that a sample walkdown was performed which identified that 49 percent of the 302 clamps sanpled were loose.
In addition, an unspecified number of clamps were missing altogether.
Based on this, TVA has issued SMI-0-317-25 to walkdown all accessible instrument sensing lines, sampling lines, radiation monitoring lines and associated drain lines to identify and correct the loose,
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..or damaged elemps.
However, the work nn SMI was termina ed because of chnging torque requi.eaments as e fined on Con?. rue.tlon Specification N2C-946.
TVA has iustified tne use of lona instrument lire c,wpr F,v piping analysis and uill umplete the aciR cn SMI-0-317-25 before the return to service from Cycle 4 outage for Unit 2.
TVA has alto comitted to intpct and correct all Unistrut-type clamps on critical supports or all pfN ng sys' ems required for safe shutdown prior to plant restart.
The staff has reviewed the inforration and requested additional information regarding missing instrument line clamps.
TVA, in their response by letter dated January 14, 1988, has informed the staff that they have also issued SMI-0-317-52 to implement a sampling progran to determine if the installed' pipe / tubing hangers meet the required span criteria and to find any missing 1
clamps. A sample of 60 clamps were chosen at random and the span adjacent to i
these clamps were neasured for evaluation of potential overspan. TVA has perfonned calculations, which indicate that the sampled instrument lines and the corresponding supports meet normal code allowances and are acceptable as installed.
The revised Modification end Additions Instructions (M&AI 09) and the revised drawings 47A 050-17, -18 and -18A will prevent recurrence of the problem.
IV. CONCLUSION Based on our review, we find TVA's investigation, evaluation and the corrective i
action plans te resolve the employee concern as described in CO-17303-SCN, Rev. 3, is acceptable erd believe that implementatier of these corrective actions will close the issue.
Verification of corrective actions which TVA has identified as a restart item should be verified by NRC inspectors in a future inspection.
i i
I.
Subject - Compression Fittings Category:
Cnnstruction(10000) l Subcategory:
Instrument Line Installation (17300)
Element:
Compression Fittings (17304)
Concerns:
XX-85-050-001 HDE-85-001 JAM-85-001 IN-85-514-001 IN-85-795-001 IN-85-795-N04 PH-85-002-027 XX-85-050-002 XX-85-050-003 This basis for Element Report C017304 - SQN Revision 3, dated January 6, 1987, are the Employee Concerns listed abcVe which state, in order:
"Inadequate quality assurance controls were applied to the installation of instrument tubing compression fittings at Sequoyah.
No furtbar information available.
No follow up required."
"2-FSV a3-319 has Parker tubing reducers with Imperial Eastman nuts.
This is an air sample line."
"Compression fittings - employee found 2 out of 4 Imperial Eastman fittings installed inpcoperly (ferrule installed backwards).
Will this affect both Nuclear and/or Personrel safety."
"1/4"D tubing from drn 150 valve to drn hdr on systen 276 closed drain system requires reaming when cut with a tube cutter.
This is not always done, nor is there an inspection hold point.
It is possible, because of tubing deformation during cutting process, that drain systems will not function as designed and an individual cutting into a system could become contaminated.
Both Units 1 and 2."
"Compression fittings on instrument tubing are not installed per vendor instructions" "NRC identified the following concern for review of QTC file.
"No formal training given to craf t on compression fittings installation.
Review of file indicates that this concern applied prior to unit 2."
"Instrumentation tubing which had been cut short was not recut, but was improperly installed in the ferrule connection to compensate for l
the improper length.
Details known to OTC, withheld due to i
confidentiality.
Construction department concern.
CI has no further I
info rma tion.
No followup required."
i 2
"Inadequate quality assurance controls were applied to the installation of instrument tubing compression fittings at Browns Ferry.
No further details available.
No follow up reouired."
j "Inadequate quality assurance controls are applied to the installation of instrument tubing comprescion fittings at Bellefente.
No further details available. No follow up required."
These concerns were evaluated by TVA as potentially nuclear safety-related.
The non-Sequoyah concerns were evaluated as potentially applicable to Sequoyah (generic).
II.
Summary of Issue - Compression fittings were not installed in accordance with the manufacturer's recommendations.
Craft personnel were not trained in how to install compression fittings.
In addition, the installation of compression fittings was not adequately addressed by the Quality Assurance program.
1 III. Evaluation - The TVA evaluators reviewed documentation, including the
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applicabic Quality Technology Company Investigation Report.
They performed a walkdown of various instrument panels on elevations 669 and 690 of the auxiliary building.
They examined storage of compression fittings in the site power stores.
1 The element report states that some compression fittings were not installed in accordance with the manufacturers' recommendations; no formal training program on compression fittirgs existed during construction and all personnel installing compression fittings were not trained in the operations training progran; and there were no procedures governing the l
installation of compression fittings or Quality Assurance involvement.
The element report further states that no visible leaking compression fittings were identified during the walkdown process.
TVA has concluded that fittings that are not leaking are acreptable based on previous history and a test from Singleton Materials Engineering Lab.
Corrective actions included a procedure defining requirements for installation of compression fittings and periodic training for the approproate technicians.
These actions were assigned tracking number CATD 17304-SQN-01, until the actions are complete, j
IV.
Conclusions - The NRC staff believes that the TVA investigation of the concerns was adequate, and their resolution of the concerns as described in Element Report C017304 SQN, Revision 3, is adequate.
Although none of the corrective actions were judged by TVA to be restart items, a position with which the NRC staff agrees, the NRC should verify implementation of the corrective actions in a future inspection.