ML20214W099

Forwards SD Alexander Findings & Comments from Special Environ Qualification Team Insp Rept 50-483/87-15 on 870504-08 Re Equipment Qualification

ML20214W099
Person / Time
Site:	Callaway
Issue date:	06/10/1987
From:	Merschoff E Office of Nuclear Reactor Regulation
To:	Harrison J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 8706150090
Download: ML20214W099 (6)

See also: IR 05000483/1987015

Text

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June 10, 1987

'

Docket No. 50-483

MEMORANDUM FOR: J.J. Harrison, Chief

Engineering Branch

Division of Reactor Safety

Region III

FROM: Ellis W. Merschoff, Acting Chief

Vendor Inspection Branch

Division of Reactor Inspection and Safeguards

Office of Nuclear Reactor Regulation

SUBJECT: NRR INPUT TO CALLAWAY EQUIPMENT QUALIFICATION

INSPECTION REPORT (50-483/87-15)

Enclosed are the findings of Mr. S. D. Alexander from the special environmental

qualification team inspection conducted by Mr. A. S. Gautum, Region III and

other NRC representatives on May 4-8, 1987 at Union Electric Company's Callaway

Nuclear Power Plant. The findings and comments are enclosed in Appendix A.

Inspection checkoff sheets are enclosed in Appendix B.

Should you have any questions concerning this correspondence, we will be

pleased to discuss them with you.

OriginalSigned by

Ellis W. Merschoft

Ellis W. Merschoff, Acting Chief

Vendor Inspection Branch

Division of Reactor Inspection and Safeguards

Office of Nuclear Reactor Regulation

Enclosures:

1. Appendix A-Report of Findings and Coments

2. Appendix B-Inspection Checkoff Sheets (18 pages)

3. h pplementary Information (83 pages)

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June 10, 1987

1

Docket No. 50-483

,

MEMORANDUM FOR: J.J.-Harrison, Chief

'

Engineering Branch '

Division of Reactor Safety.

Region III

} FROM: Ellis W. Merschoff, Acting Chief

Vendor Inspection Branch

Division of Reactor Inspection and Safeguards

Office of Nuclear Reactor Regulation

SUBJECT: NRR INPUT TO CALLAWAY EQUIPMENT QUALIFICATION

INSPECTIONREPORT(50-483/87-15)

Enclosed are the findings of Mr. S. D. Alexander from the special environmental

qualification team inspection conducted by Mr. A. S. Gautum, Region III and

l other NRC representatives on May 4-8, 1987 at Union Electric Company's Callaway

Nuclear Power Plant. The findings and coments are enclosed in Appendix A.

Inspection checkoff sheets are enclosed in Appendix B.

l Should you have any questions concerning this correspondence, we will be

,

pleased to discuss them with you.

~-

Original Signed by

l EllisW.Merschott

!

'

Ellis W. Merschoff Acting Chief

. Vendor Inspection Branch

Division of Reactor Inspection and Safeguards

Office of Nuclear Reactor Regulation

..

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Enclosures:

1. Appendix A-Report of Findings and Comments

l 2. AppendixB-InspectionCheckoffSheets(18pages)

F 3. SupplementaryInformation(83pages)

DISTRIBUTION: w/ Enclosure.1

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k***** June 10, 1987

.

'

Docket No. 50-483

MEMORANDUM FOR: J.J. Harrison, Chief

Engineering Branch

Division of Reactor Safety

Region III

FROM: Ellis W. Merschoff, Acting Chief

Vendor Inspection Branch

Division of Reactor Inspection and Safeguards

Office of Nuclear Reactor Regulation

SUBJECT: NRR INPUT TO CALLAWAY EQUIPMENT QUALIFICATION

INSPECTIONREPORT(50-483/87-15)

Enclosed are the findings of Mr. S. D. Alexander from the special environmental

qualification team inspection conducted by Mr. A. S. Gautum, Region III and

other NRC representatives on May 4-8, 1987 at Union Electric Company's Callaway

Nuclear Power Plant. The findings and comments are enclosed in Appendix A.

- -Inspection checkoff sheets are enclosed in Appendix B.

Should you have any questir 'ncerning this correspondence, we will be

pleased to discuss them wi u.

.

.. L 3.fId

n s Ellis W. Merschof Acting Chief

,

Vendor Inspection ranch

Division of Reactor Inspection and Safeguards

1 Office of Nuclear Reactor Regulation

E

h Enclosures:

I: 1. Appendix A-Report of Findings and Comments

2. Appendix B-Inspection Checkoff Sheets (18 pages)

3. Supplementary Information (83 pages)

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APPENDIX A

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j. A. Findings:

None. ,

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B. Comments Resulting from Review of EQ Files:

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1. File ESE-040A, ITT Barton Model 580A-1 Differential Pressure (Flow)

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Indicating Switches (FIS), Plant ID Nos.: EJ-FIS-0610 and 0611,

! located outside containment in the Auxiliary Building, Room 1301

! West. The DBA environment for the FISs is mild except that radiation

was erroneously listed on the Equipment Evaluation Worksheet (EEW)

i (same as SKEW) as 2.46 10E06 Rads for room 1126. The claimed

qualification level for this equipment was NUREG-0588, Cat. I, which

is required for this plant for other than replacement equipment. ,

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The test report used as the basis for qualification (Westinghouse

WCAP 8687 Supp 2-E 40A Rev 1) cited two series of tests. The first .

j was on Model 580A-1 (same as installed). The report indicated-that

i these samples had been appropriately thermally and radiation aged

4 (including DBA dose) and were then subjected to seismic testing.

I Post-seismic performance data was given, expressed in terms of cali-

i bration data setpoint shift. However, the DBA accuracy requirement

1 of i 4.0% as stated on the EEW was not met. No post-aging, pre-DBA

j functional performance data was reported. These data were therefore

inadequate to establish qualification. The second test series was

on samples of Model 581-4 (similar to installed). While the post

j seismic calibration setpoint shift was within tolerance, the samples

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had not been aged or irradiated, thus rendering these data unusable

as well.

The licensee established that the actual radiation level for these

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FISs is 3.41 10E03. The defined harsh radiatica environment for

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Callaway was conservatively set at 10 E03 Rads instead of the usual

10 E04 to automatically cover susceptible electronic components.

Based on this and data on the materials used in the switches and

their radiation tolerances (provided for the inspectors' review),

the licensee determined that FISs EJ-FIS-0610 ard 0611 could be

considered in a mild environment for EQ purposes, i.e., outside the

scope of 10 CFR 50.49. Accordingly, they indicated their intention -

to remove these FISs from the EQ Master List.

!

j. 2. File E-093, Struthers-Dunn Model 219 Relays and Model 236 Time Delay c

j Relays used in Comsip Auxiliary relay cabinet RP-209 in Auxiliary

Building room 1320. Qualification was claimed to meet the require-

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ments of NUREG-0568, Category I, Appendix E Category A for LOCA  :

p (radiation only - 1.87 E4 Rads), Category D for MSLB (not exposed)

and Category B for HELB (not needed, but must not fail detrimentally

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to plant safety - 180'F peak for about 25 seconds /1 psig peak for

less than 20 seconds and 100% RH).

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An accident type test, per se, was not conducted. Qualification for

1 the HELB was based on thermal and radiation aging and DBE irradiation. ,

The thermal aging was done in near 100 RH and time and temperature

significantly exceeded the relatively mild HELB environment, but

radiation exposure was only to 1.2 10E03 Rads, and functional tests

,

of the relays in the original test sequence resulted in failure of

all but 5 of over twenty samples. The failure mode was not described

in detail but failures were attributed to aging of the PVC amature

hinge bearing pads at too high a temperature so a second test sequence

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was conducted.

The second test sequence had successful functional tests. Agin

! the PVC pads equivalent to 40 years (more for other components)g was of

done at 185*F for 522 days (100 % RH) which enveloped the HELB envi-

ronment, but the samples were not irradiated.

The qualification was ultimately based on a combination of partial

type testing with analysis. The licensee provided inforination which

clarified what materials were in the relays installed at Callaway

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i (which was not explicit in the file) and also produced the EPRI

references cited in the file for their radiation tolerances which

indicated considerable margin over plant requirements. The large

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amount of margin was also used to justify lack of sequential testing

to address synergistic effects. The licensee planned to incorporate

all clarifications and additional amplifying infomation in the file.

3. A summary of the qualification of various lubricants used at Callaway

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in EQ equipment was provided by the licensee at the end of the ,

inspection. There was insufficient time available to review indivi-

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dual lubricant qualification files. The sunenary information covered

lubricants of interest and indicated how they were qualified. It

, also included copies of pages from referenced documents as supporting

'

evidence. No findings were identified.

C. Walkdown Coments:

! 1. Westinghouse Model IADP/ Style 76D57375/FR 286T motor used for the AB

h penetration room cooler "B" air handler blower was examined. The

Raychem NMCK used on the motor winding lead to field wiring connection

appeared satisfactory, but the motor lead insulation was indented or 5

< gauged up to about 1 m deep in several places. The licensee

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evaluated the condition and determined that it was operable however '

they committea to n.aking repairs as a precautionary measure. The

licensee provided documentation of the evaluation and work request.  ;

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2. Reliance Type P/FR 445-C8 motor for Joy Axivane Hydrogen Mixing Fan

"C", Plant I.D: C-CN-03C, located in containment had 480 Vac service

Raychem WCSFN heat shrink sleeving installed over the motor lead to

field cable bolted splices. The Raychem appeared to be installed

correctly except that it was over the braided tr.sulation material on

the motor lead windings. The qualification file indicated that this

type motor had been qualified with its winding connections exposed to

the DBE environment and, although there were low irs, the motor

functioned properly. The licensee had covered the splices with

Raychem to prevent the connections in the installed motor from

shorting out to each other or to the connection box. As an added

precaution, the licensee committed to confirming that the splices did

not touch the inside of the connection box to eliminate any potential

moisture ground paths that might be associated with the sleeving.

This was identified as an Open Item.

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2. Reliance Type P/FR 445-C8 motor for Joy Axivane Hydrogen Mixing Fan

"C", Plant I.D: C-CN-03C, located in containment had 480 Vac service

Raychem WCSFN heat shrink sleeving installed over the motor lead to

l field cable bolted splices. The Raychem appeared to be installed

l

'

correctly except that it was over the braided insulation material on

the motor lead windings. The qualification file indicated that this

type motor had been qualified with its winding connections exposed to

the DBE environment and, although there were low irs, the motor

functioned properly. The licensee had covered the splices with

Raychem to prevent the connections in the installed motor from

shorting out to each other or to the connection box. As an added

precaution, the licensee committed to confirming that the splices did

not touch the inside of the connection box to eliminate any potential

j moisture ground paths that might be associated with the sleeving.

j

This was identified as an Open Item.

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