ML20031E389
| ML20031E389 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/07/1981 |
| From: | Parris H TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 NUDOCS 8110150449 | |
| Download: ML20031E389 (4) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ot 500A Chestnut Street Tower II October 7, 1981
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m Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Connission a
Office of Inspection and Enforcement 000 4 NN[-
Region II
'., Yo ds!'amt as y 101 Marietta Street, Suite 3100 k
,g Atlanta, Georgia 30303 Q
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Dear Mr. O'Reilly:
TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 1 -
DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR 10 CFR 21 RE2 ORT
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It has been discovered that eight flywheel bearing pedestal holddown bolt lockwashers on the Browns Ferry Nuclear Plant unit 1 low pressure coolant injection motor generator sets were broken. This condition was caused by improper heat treatment of the lockwashers by the vendor.
This problem, which is reportable under 10 CFR 21, was reported to me on October 7, 1981.
t The enclosed Part 21 report contains additional information about this matter.
Very truly yours, t
o-
, TENNESSEE VALLEI AUIBORITY.
H.' G.' 'Parris'
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Manager of Power Enclosure 4
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.T&nnos:sa Vsilsy Authority B're/Sts. F3rry Nuclear Plant EVALUATION LOGIC FOR.PART 21 T h h d h d sys g (x) e.,
ec M 93d.5beMS O vs L9c.T PROBLEM: D4 cr Voderd>]
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IDENTIFIED BY: LER BFR0 50-
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, Trouble Report #
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Corrective Action Repor;
, Quality Assurance Survey Audit Other k This problem does not involve material defect, inadequate design, or fabrication l
l error and is not subject to 10CFR21 reporting in accordance with DPM N77A14.
or This problem involves a ma:erial defect, inadequate design, or fabrication error and g/
is evaluated as follows:
Yes No I.- Deficiency of a plant security system:
1.
Could defect create a substantial safety hazard?
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If yes, report as part 21.
p II.
Is the component necessary to ensure:
1.
The integrity of the reactor coolant boundary?
i-i cg' 2.
The capability to shut down reactor and maintain it in a safe shutdown condition?
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3.- The capability to prevent or mitigate the conse-quences of accidents which could result in a potential offsite exposure comparable to those referred to in 10CFR100.11?
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'III. 'Is defect in a ' basic component one that-has been -
accepted for ownership?
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Installed for use or operation?
If a yes in II and III above, could defect create a sub-
$r Il stantial safety hazard?
If yes - report as part 21.
i IV.
Is defect in a basic component:
l A conditiod -that could ~ dontribute to exceeding at safety limit?
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If yes, to one of II and IV above, report as part 21.
Recommendation:
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This problem is not reportable, or
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M This problem is reportable and included in'LER or 'part 21' Report,. - - ArTT M \\ M
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f Submitted:
Revieve Approved:
Ch h l
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N Reviewer /Date Quality Assurance /Date PORD Chairman /Date Supervisor
.?c-QA PROGRAM REl.ATED Page 6 Ital.14 0]AM Prrt 111, Sec 1
N77A14 Revised 3/30/81 PART 21 REPORT Purchase Contract 78K5-823297 Browns Ferry References Plant
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Component or System Identification
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Louis Allis
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Supplier of Component Nature of Defect or Noncompliance Flywheel bearing pedestal hold-down bolt
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lockwashers' broken (See ' attached ' report) '
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s Extent of Safety Itazard Could possibly cause complete failure of MG sets Date Which Defect or Noncompliance Was Discovered 8/26/81 Number of Identical Components in Use 12 MG sets (48 lockwashers)
Location of Components 4 (each) in units 1, 2, and 3 Corrective Action Taken or To Be haken See attached report.
Length of Time Requi' red to ' Completic Action.
8'- 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />'per'MG set'.'
llas defect' or noncomplianec been reporteil previously? Yes / / No d /'
IE yes,.by what means?.
DrMMh _
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iared b Date A
f-/7-Ry "A{ip roved Date
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CoivwudL.J&suuues
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Subject:
Unit 1 Low Pressure Coolant Injection Motor Generator Set.
Flywheel Bearing Pedestal Holddown Bolt Inckwashers The motor generator sets installed'on unit I have i generic problem witit breakage of the vwidor supplied flywheel bearing pedestal holddown bolt lockwashers.
This problem was also identified on the motor generator sets installed on unit 3.
Each motor generater set has four bearing pedestal holddown bolts which,have one lockwasher per bolt. An inspection conducte.d on August 26,198I found two of the unit 1 low pressure coolant
~' injectioi sotor generitor' sets installed and 'op'erating/' The other two '
motor generator sets on unit 1 were in the. process of. being. installed and were not operational. Of the two operational motor generator sets, one broken lockwasher per motor generator set was found.
Of the two nonoperational motor generator sets,. two broken lockwashers on one motor generator set and four broken lockwashers on the other motor generator set were found. A total of eight broken lockwashers were found on unit I which was exactly half of the total lockwashers.
i Pieces of these broken lockwashers were field checked with a hardness-l tester. Extremely wide hardness variations were found. Hardness values ranged from side to side on some of the same pieces by as much as 20 points on the Rockwell C scale.
It is apparent that the vendor supplied lockwashers did not have the proper heat. treatment _..
All of the motor generator sets for the low pressure coolant injection
. modifications.on.all three units were received.at the,same time.
Since,,
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units 1 and. 3 were found to have ' problems with their lockwashers, it' is very likely that the unit 2 motor generator sets will have similar problems.
The problems on unit 1 will be resolved by replacing all lockwashers. The unit 3 problems were resolved by replacing the lockwashers.
Unit 2 motor generator sets have not been installed.
installation..
Lockwashers will be replaced before o
RTS:CJP 10/5/81
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