ML20085M621
| ML20085M621 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 10/21/1975 |
| From: | Brey H, Hillyard H, Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20085M622 | List: |
| References | |
| AO-50-267-75-18, NUDOCS 8311090087 | |
| Download: ML20085M621 (10) | |
Text
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P. O. Box J61, Platteville,' Colorado 80651 J
,s
/o g,
October 21, 1975 i
Mr. E. Morris lloward, Director Nuc1 car Regulatory Commission Region IV Office of Inspection and Enforcement Suite 1000 j
Arlington, Texas 76012 REF: Facility Operating License No. DPR-34 Docket !To. 50-267
Dear Mr. Ilovard:
Enclose'd please find a copy of Abnormal Occurrence Report No. 50-267/75/
18A, Final, submitted per the requirements of the Technical Specifications.
l Very truly yours, j
Frederic E. Swart Superintendent, Nuclear Production Fort St. Vrain, Nuclear Generating Station FES/alk cc: Mr. Roger S. Boyd V
8311090087 7
/2,393
O.
O REPORT DATE:
October 21, 1975 ABN013tAL OCCURRENCF. 75/18A Pahe 1 of 9 OCCURRENCE DATE: August 16, 1975 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE C0!!PANY OF COLORA1x)
P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/75/18A Final 1DENTIFICATION OF OCCURRENCE:
Damage to helium circulator during installation preparation.
This is identified an an abnormal occurrence under item 2.1 (g) of the Technical Specifications.
Notification of the cause of the incident was received from the contractor on August 26, 1975.
CONDITIONS PRIOR TO OCCURRENCE:
Steady State' Power Routine Shutdown Hot Shutdown Pstline Load Change X-Cold Shutdown ~
'Other (specify)
~
Refueling Shutdown Routine Startup The major plant parameters at the time of the event were as follows:
Power RTR 0
MWth ELECT 0
MWe Secondary Coolant Pressure' N/A psig Temperature N/A
'F Flow N/A f/hr.
l
'l Primary Coolant Pressure O
psig
{
I Temperature' 120*F
- F Core Inlet 120*F
'F Core Outlet Flow I circulator at 4,'000 RPM i
AllN0i OCCUliltENCC 75/18A Page 2 of 9
)
1 DESCgIPTION OF OCL,tURENCE:
f During preparation 'of helium circulator, S/N C-2101 for installation, into the "11" circulator penetration, damge to the circulatdr was sustained as the handling cash annembly was lownted while the circulator within t he 1
cask was being supported by the multi-stage ram.
Thin action resulted in the transfer of the cask assembly support from the single stage rams to i
the multi-stage ram through the etreulator.
The contact for load transfer occurred hetveen the closed ball valve and the helium circulator. The occurrence was a result of failure to adhere to approve procedures.
(See Figures 1.1 and 1A).
i APPARENT CAUSE OF OCCUnitENCE:
Design Ununual Service Cond.
In':luding Environ.
Manu facture Component Failure Installation /Const.
x Other (specify) c.
_ Operator Lack of adherence to approved
{
Procedure procedure.
i ANALYSIS OF OCCURREMCE:
A thorough investigation to determine the extent of the damage incurred by helium circulator S/N C-2101, being installed in "B" circulator penetration has been completed by the contractor.
l The investigation determined that circulator damage was confined to the stator assembly, a non-rotating component.
No damage was sustained by rotating components.
Visual inspection of the ball valve revealed a broken index plunger assembly (P/N T-2101-5).
The ball valve movco freely without any indications of I
binding.
I Visual inspection of the circulator showed a depression 2" - 21/2" deep in the stator cone (P/N C-2101-380-5) from ball valve contact.
The upper rim j
of the cone also showed contact on its inner diameter wit.h the ball valve as evidenced by paint transfer from the ball valve to the cone. The heavics't l
contact was indicated in the segment between pin (C-2101-380,-7) and the circ'u-i lator reference mark. The pin also showed light contact..No other damage was detected through visual inspection. Compressor cicarance checks revealed an' l
approximate.030 inch deficction of the retaining ring (C-2101-380-6) down-l ward toward the compressor in the segment in which the heaviest contact was noted. This was determined by the compressor tipper axial cicarance devia--
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ADNORMAf, OCCURRENCE 75/18A page p_~g 9
. Ors U
CIRCULATOR PEllr.T RAl 10!!
CENTER ACCESS f
PEllETil AT IOri b
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S2102
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ADt;O104AL OCCURfCtlCC 75/10A
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ABNORMAL. OCCURRENCE 7,5/1HA Pag'c 5 of 9 i
l ANALYSIS OF OCCURRl'.NCE (continued)_:
tion from nominal.
Compressor lower axial clearances and compressor blade tip cicarances indicated that there was no distort fon or dinplacement of the inlet duet relative to the compressor whccl. The stator assembly was removed and revealed no evidence of stat or contact with the comprensor.
Both the stator and compressor were coated with a light film of rusty type dust accumulated dur.ing handling.
No di strubadce of t.his dust could be seen. A check of compressor wheel bolt torques was also made and found nor-mal. This was an additional indication tha't no abnormal loada had been imposed on the compressor.
The welds on the inlet duct struts (C-2101-341-6) which carry duct and stator loads were dyc checked for evidence of failure.
Four welds showed 1/32 inch linear indications on the weld to strut interface at the strut trailing edges.
These indications were burnished out.
A recheck with dye penetrant showed 4
j that there is no material failure.- Cross sectional area reduction through burnishing at the strut to wcld interface was Icss than.001 square inches on any one strut.
(See attached drawings).
CORRECT,IVE ACTION:
Notification has been given to construction management t' hat personnel involved
{
are not to proceed on their own.
They shall have approved procedures and proper supervision present to verify adherence to such procedures.
Replace-ment of the index plunger assembly has restored the ball valve.
Replacement.of the stator, assembly and cone has restored S/N C-2101, "B" circulator to full operational capability. The replacement stator and conc assembly utilized were from the circulator removed (S/N C-2105) f rom the "B" pcuctration and were inspected and certified by the contractors quality assurance department.
FAILURE DATA /SIMILW REPORTED OCCURRENCES:
None PROCiUOfMATIC IMPACT:
None I-CODE IMPACT:
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'O ABNORilAl, OCCUlil ENCE 75/18A Page 9 of 9
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48 Submitted By:,liarvey W. Ill).ly4ird, Jr/
Technical Services Supervinor p
Reviewed By:
" NA Aj 1,h tt 4 5
- 11. 1.a rry lire t, Superintendent, Operations i.
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7y 6-w;<.t.v(0
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Approved By:
Fyederic 1:. Swart S6perintendent, Nuclear Production O
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