ML20085M623

AO 50-267/75/18:on 750816,during Installation Preparation, Helium Circulator Damaged.Caused by Lack of Adherence to Approved Procedure.Personnel Counseled to Adhere to Approved Procedures & Supervision

ML20085M623
Person / Time
Site:	Fort Saint Vrain
Issue date:	09/05/1975
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: ML20085M621 ML20085M623
References
AO-50-267-75-18, NUDOCS 8311090095
Download: ML20085M623 (10)

Text

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1 O O P. O. Box 361, Pla'tteville, Colorado 80651 I

September 5, 1975

• hRecgm ,6 E

Mr. E. Morris Howard, Director 6 Ep Nuclear Regulatory Commission Region IV 2

g # .,"'" { l1$

p htr .

Offico of Inspection and Enforcement 'D,g#, '?

Suite 1000 V Arlington, Texas 76012 /)

Ref: Facility Operating License No. DPR-34

. Docket No. 50-2G7 Dear Hr. Howards 1:nclosed please find a copy of Abnormal occurrence Report No. 50-2G7/75/.8, .

Preliminary, submitted per the requirements of the Technical Specifications.

Very truly yours, .

Frederic E. Swart Superintendent, Nuclear Production Fort St. Vrain Nuclear .

Generating Stati'n o FES/alk cca Mr." Angelo Giambusso PDR m

COPY {SEJU REGION 9fb_7 ~

o o, RERPOT DATE: Siptember 5, 1975 ABNORMAL OCCURRENCE 75/18 OCCURRENCE DATE: August 16, 1975 ,

ET)RT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COIDRADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/75/18 Preliminary

. IDENTIFICATION 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 catse of the incident was received from the contractor on August 26, 1975.

CONDITIONS PRIOR TO OCC'RRENCE:

U Steady State Power Routine Shutdown

, Hot Shutdown Routine Load Change Cold Shutdown X Other (specify)

Refueling Shutdo'wn -

~

Routine Startup

}

The major plant parameters at the time of the event were as follows: ,

j Power RTR

• O MWth 2 ELECT O MWe

• J 6

Secondary Coolant Pressure N/A psig i Temperature N/A 'F

!^

' Flow #/hr.

Primary Coolant Pressure O psig

• Temperature 120'F 'F Core Inlet 120*F 'F Core Outlet Flow 1 circulator at 4,000 RPM #/hr.

9

+

q g L/ V .

ABNORMAL OCCURRENCE 75/18 Page 2 of 9

=

DESCRIPTION OF .

OCCURRENCE:

During installation preparation of helium circulator, S/N C-2101, into the "B" circulator penetration, damage to the circulator was sustained as the handling cask assembly was lowered while the circulator within the cask was being supported by the multi-stage ram. This action resulted in the transfer of the cask assembly support from the single stage rams to the multi-stage ram through the circulator.

'The contact for load transfer occurr'ed between the closed ball valve and the helium circulator. The occurrence was a result of failure to adhere to approved procedures. (See Figures 1.1 and 1A) .

APPARENT CAUSE OF OCCURRENCE: Design Unusual Service Cond.

Including Environ.

Manufacture Component Failure Installation /Const. X Other (specify)

. Operator Lack of adherence to approved Procedure procedure.

AFALYSIS-OF OCCURRENCE:

1 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.

j r

The investigation determined that circulator damage is confined to the stator assembly, a non-rotating component. No damage was sustained by by rotating components.

Visual inspection of the ball valve revealed a broken index plunger assembly (P/N T-2101-5) . The ball valve moves freely without any indications of binding.

Visual inspection of the circulator showed a depression 2" - 2 1/2" deep in ,

the stator cone (P/N C-2101-380-5) from ball valvo contact. The upper rim -

of the cone also showed contact on its inner diameter with the ball valve as evidenced by paint transfer from the ball valve to the cone. The heaviest contact is indicated in the segment between pin (C-2101-380-7) and the circu-lator reference mark. The pin also showed light contact. No other damage was detected through visual inspection. Compressor clearance checks revealed an

~

approximate .030 inch deflection of the retcining ring (C-2101-380-6) down-ward toward the compr,cssor in the segment in which the heaviest contact was noted. This,was determined by the compressor upper axial clearanco devia-g . .. . . .. . . . . .. .. . . . . . . .

M CURRENCE 75/18 C I RCUI. ATOR PENE TR Af 10N CENTER ACCESS ,

PENETRAT10tl BALL VALVE vk '

T2101 f

~J UPPER CASK v T2101 OPERATING SHUT 0FF VALVE IIAMDLING m .

PLATFORti CONTROL C0tiSOLE S2102 T2101

\ 11 CASK 4 ,

HYORAULIC SYSTEll PlPE Cd ',*,~, sh '~'

Ith0LCONSOLE g

[5 ti /.ULIC k

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$ - RESERVOIR I

%, N .+<( [M C S2108 A .

s. Q 5"*'

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• m TURNTABLE 4-0 S2102 4 y TURNTABLE

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? SUBSTRUCTURE 35 '

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t i  ? MULTISTAGE -

!  ; w' & RAM SUPPORT .

Nhht. , STRUCTURE S2106 s

hih ' ,HULTISTAGE q l .

! RAM l

S2108 O G y

9 q

4

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D. FIGURE 1A ABNO OCCURRENCE 75/18

- d P g2 f9 HE CIRCHATOR HANDLING MECIWHS4 i

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a ABNORMAL OCCURRENCE 75/18 Page 5 of 9 j.

. , t i ANALYSIS OF P OCCURRENCE (continued):

- tion from nominal. Compressor lower axial clearances and compressor blade

[

tip clearances indicated that there was no distortion or displacement of

] the inlet duct relative to the compressor wheel. The stator assembly was t

}

removed and revealed no evidence of stator contact with the compressor,

! Both the stator and compressor were coated with a light film of. rusty type dust accumulated during handling. No disturbance of this dust could be seen. A check of compressor wheel bolt torques was also made and found nor-mal. This was an additional indication that no abnormal loads had been

! imposed on.the compressor.

I The welds on the inlet duct struts (C-2101-341-6) which carry duct and stator loads were dye checked for evidence of failure. Four welds showed 1/32 inch linear indications on the weld to strut interface at the strut trailing edges. .

j These indications were burnished out. A recheck with dye penetrant showed ,

• that there is no material failure. Cross sectional area reduction through burnishing at the strut to weld interface was less than .001 square inches on any one strut. (See attached drawings) .

CORRECTIVE ,

i ACTION: ,

i i

Notification has been given to construction management that personnel involved i

are.not to proceed on their own. They shall have approved proceduresReplace- and proper supervision present to verify adherence to such procedures.

ment of index plunger assembly will restore the ball valve. Replacement of -

the stator assembly and cone will restore S/N C-2101, "B" circulator to full ,

l operational capability. The replacement stator and cono assembly. utilized were from the circulator removed (S/N C-2105) .from the *. B" penetration and l

I were inspected and certified by the contractors.. quality assurance department. .

+

+- - 1 FAILURE DATA /SIMIL7.R REPORTED OCCURRENCES: 1 l

< None ,

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PROGRAMMATIC IMPACT:

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ABNORMAL OCCURRENCE 75/18 Page 9 of 9 Submitted By: /

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.e Approved By: Es o _; , d Fr'ederic E. Swart }

i Superintendent, Nuc1 car Production i

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