GO2-83-610, Interim Deficiency Rept Re Reportable Condition 264, Concerning Improperly Sized Overcurrent Devices.Initially Reported on 830609.Pump & Valve Operator Motor Fuses Replaced.Fuse Size Verified.Next Rept by 831003

Interim Deficiency Rept Re Reportable Condition 264, Concerning Improperly Sized Overcurrent Devices.Initially Reported on 830609.Pump & Valve Operator Motor Fuses Replaced.Fuse Size Verified.Next Rept by 831003

ML20076K774
Person / Time
Site:	Columbia
Issue date:	07/08/1983
From:	Carlisle C WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, 264, GO2-83-610, NUDOCS 8307180083
Download: ML20076K774 (6)

Text

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Wo P.O. Box 968 Washington Public Power Supply SystefiaI7j,,9)p72,-5 3000GeorgeWashingtonWay Richland, Washington 99352 (50

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Docket No. 50-397 -

,yE/C?p July 8, 1983 G02-83-610 Mr. J. B. Martin Regional Administrator U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596

Subject:

NUCLEAR PROJECT NO. 2 10CFR50.55(e) REPORTABLE CONDITION #264 IMPROPERLY SIZED OVERCURRENT DEVICES

Reference:

Telecon QA2-83-ll2, dated June 9, 1983, L.C. Floyd to A. D'Angelo.

In accordance with the provisions of 10CFR50.55(e), your office was informed, by telephone, of the above subject condition on June 9, 1983.

Attachment I provides the Project's interim report on this condition.

We will continue to provide your office with quarterly updates. The next report will be submitted on or before October 3, 1983.

If you have any questions regarding this subject, please contact Roger Johnson, WNP-2 Project QA Manager, at (509) 377-2501, extension 2712.

Program Director, WNP-2 LCF/kd

Attachment:

As stated cc: W.S. Chin, B9A N.D. Lewis, EFEEC Document Control Desk, NRC 8307180083 830700 PDR ADOCK 05000397 PDR S

s- ATTACHMENT I WASHINGTON PUBLIC POWER SUPPLY SYSTEit NUCLEAR PROJECT NO. 2-DOCKET NO. 50-397 LICENSE N0. CPPR-93 10CFR50.55(e) CONDITION #264 IMPROPERLY SIZED OVERCURRENT DEVICES INTERIM REPORT Description of Deficiency Improperly sized overcurrent devices (fuses on WNP-2) in the feeders for DC motors may not be properly sized to allow for starting and/or plugging cur-rents. These currents may cause the fuses to begin to melt and eventually fail after several cycles.

Safety Implication Fuses for 125 and 250 VDC, Class 1E, pump and valve operator motors were sized between 125 ind 150% of motor full load current. This meets the requirements of the National Electric Code (NEC), Section 430-52 and Table 450-152, which limits fuse sizing to 150% of motor full load current. Exception 2b of NEC Section 430-52, permits fuse sizing to be increased to 225% of full load cur-rent, where 150% is not adequate to permit motor operation. This exception was r.ot used in initial fuse sizing.

Jogging pumps and throttling valve operator motors fused at 150% or below of full load current could fail due to repetitive inrush current haating of the fuse and eventually causing melting of the fuse. Continuous duty across-line-starting valve operator motors and one continuous duty reduced voltage starting valve operator motor fused at 150% are not adequately fused to permit motor starting.

The WNP-2 pumps and valves which could be affected by this deviation are list-ed in Taole 1. In order to determine if the fuses for these valves and pump motors could melt under their operating conditions, a study would be required to determine the frequency of energization of each valve and pump uotor.

With this information, the probability of fuse melting could be evaluated and the impact of any loss of these valves or pump on their safety system could be determined. However, during abnormal plant operations, the frequency of energization of these items would require extensive analysis and such an analysis still may not be definitive. Therefore, this deviation is considered to be reportable under 10CFR50.55(e).

Corrective Action Project Engineering Directive (PED) 218-E-B800 is being issued to accomplish the following:

1) Fuses for pump and valve operator motors are being replaced with those sized based on motor nameplate rating, coordinating with fuse melt curves to provide a minimum safe time of two (2) minutes at 200% full load current and 600% full load current for a uinimum of 10 seconds. This action meets the requirements of NUREG 1.106 criteria.

I

. Attachment I Page 2 Corrective Action (Continued)

2) Adequacy of the fuse size to be verified during the performance of startup

'ests by measuring the currents and comparing them with the ones used for the calculations (nameplate data).

Action to Prevent Recurrence Methodology used to properly size fuses used in conjunction with safety re-lated motors, to comply with NUREG 1.106, is being added to the Burns and Roe Engineering Criteria Document.

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..Page 1 of 3 -,,

SUMMARY

OF _ LOADS AND FEEDERS. ,

o. . . . .

COMMENTS ..

FEEDER- FROM TO '

DC SYSTEM

'DP-S2-1 '

250 VDC 1D21-1 '

Batt. B2-1 '

1D21-3' 'DP-S2-1 MC-S2 -1 A , ,

. - 250 VDC -

~

~

250 VDC 1H21A-80 ,

MC -S2-1 B I ', * -

250 VDC 1A21-9001 DP-S2--) -

I

• 1.A21-9002 .

. Throttling valve . g 250 VDC 1H21A-10' HC-S2 -1 A W/f 51-C00 2. l' g' RHR-V Non-throttling valve 250 VDC 1H21A-20 HC-S2-1A

• Throttling valve [

1H21A-40 MC-S2-1A RH R-V-23 250 VDC '

RWCD-V-4  ; ))on-throttling valia .

~ h' 1 250 VDC -

1H21A-70 . .HC-S2-1A .

.RCIC-V-13 Non-throttling valve MC-S2-1A 250 VDC 1H21A-120

• Hon-throttling valve - -

1H21A-130. MC-S2-1A RCIC-V-19 -

250 VDC Throttling valve 250 VDC 1H21A-140 HC-S2-1A

• RCIC-V-22 '

'RCIC-V-59 Non-throttling valve - .

16121 A-150 ' - HC-S2-1A 250 VDC *: RCIC-V-64 'N'on-throttling valve

• l 250 VDC IH21 A--160 HC-S2-1A ' .

MC-S2-1A RCIC-V-45

- Non-throttling valve l' 250 VDC . I nt21 A-17 0 Seals in i

RCIC-P-2 I 250 VOC' .- 1H21A-1C0 HC-S2-1A - Operates based on vacoung tank >l 250 VDC 1H21A-190 HC-S2,1A". RCIC-P-4 l,

p

. . .. ,' . pressure Hon-throttling valve -

250 VDC.

1H21A-200 MC-S2-1A RCIC-V-69 ,

HCLS2-1B . TG-EOP-1 . Runs for entire coastdown period.

250 VDC . AM21B-10 .

• TG-ASOBP-1 Runs continuously 250 VDC AM218-20 MC-S 2-1 B Runs on low oil pressure demarid I

250 VDC 250 VDC .

PH218-30' AM21B-40 HC-S2-1B HC-S2-1B R ET-EOP-1 A RET-EOP-1B Runs on low oil pressure demand h I

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DC SYSTEM PEEDER FHOH TO COHHENTS '. . .i .

125 VDC 1D11-1 Batt D1-1 DP-S1-1 -

(Div. I) . -

125 VDC 1D11-3

• DP-SI-1

' HC-SI-1D -

(Div. I) .

125 VDC 1H11D-10' HC-SI-ID RCIC-V-31 'Non-throttling valve CDiv. I) ,

125 VDC 1H110-20

• HC-SI-1D DO-Pr3A-1 Run for only 13 sec to start D-G i (Div. I) ' .

125 VDC 1H110-30 .HC-SI-ID RCIC-V - 10 Non-throttling valve (Div. I) .

125 VDC' 1H11D-40 HC-81-1D DO-P-3A-2 (Div. I)

~ '

, Run for only 13 see to start DQ~.g .

125 VDC IH11D-50 HC-S1-ID ,RCIC-V-8* * -

Throttling valve (Div. I) 125 VDC IHilD-60 HC-SI-1D -

DLO-P-2A-1~ .

Run for only 13 see to start D-G (Div. I) . . -

125 VDC -

1H11D-70 HC-S I-Ilf DLO-P-2A-2 Run for only 13 see to start D-G -

(Div.

125 VDC I) .

1H11D-80 HC-SI-ID CAC-V-2 'Non-throttling valve -

(Div. I) ,

125 VDC 1M110-90 HC-81-ID CAC-V-6 . Non-throttling valve (Div. I) .

125 VDC IH11D-100 HC-SI-ID CAC-V-4 Non-throttl'ing valve .

(Div. I) 125 VDC '

1H11D-110 HC-SI-ID CAC-V-8 Non-throttling vavle (Div. I) ,

125 VDC 1H11D-120 HC-S I-I D '

RCIC-V-110 f']')

Non-throttling valve (Div. I) 125 VDC '

.1H11D-130 MC-SI-ID RH R-V-4 0 Throttling valve iniv. I) . *

. l25 VDC IH11D-140 HC-St-1D -

MS-V-19 Non-throttling valve ..

(Div. I) 125 VDC 1H11D-170 HC-SI-ID RCIC-V-46 Non-throttling valve (Div. I) -

125 VDC A5111D-9160* HC-St-1D RCC-V-6 Non-throttling valve -

(Div. I) ,

• ?Jon-Cl a s s le motor purchased 80% starting voltage capability.

u

I _

aDC SYSTEM _.

-PEEDER -

FROM ' -

t

.T_O_. .

COtt_HENT_ 'S

'125 VDC t , .. .

2012-1 '

Batt 'B1-2

• DP-SI-2

~

~

~

(Div. II) -

• 125 VDC 2012-9 ..

DP-S112 HC-SI-2D (Div. II) -

125 VDC 2H12D-10 l

HC'-SI-2D DO-P-381 .

JDiv. II) Rhn for only 13 sec to start D-G !

. 125 VDC 2H12D-20  !. - - '

HC-SI-2D DO-P-382 ' * .

' (Div. II)

' Run for only. '13 see to start D-G -l 125 VDC 2H12D-30 HC-SI-2D DLO-P-2B1 -

(Div. II).

Run for only 13 sec to start D-G 125 VDC 2H12D-40 HC-St-2D (Div, II)

• DLO-P-282 , Rdn for only 13' sea to start

• 3, 125 VDC 2H12D-50 HC-SI-2D CAC-V-11 '

(Div. II) .

Hon-throttling valve 125 VDC 2H12D-60 HC-SI-2D (Div. II) CAC-V- 15 Non-throttling valve ' '

125 VDC 2H120-70 HC-St-2D

- CAC-V-13 Non-throt tling . valve (Div. II) -

125 VDC 2H12D-80 HC-SI-20 (Div. II) '

CAC-V-17 Non-throttling valve ,

125 VDC 2H120-90 MC-St-20 RCIC-V-113, (Div. II) ' '

Non-throttling valva -

3 .

O e . .

.  % b O

. g . .

• ___ ___ ____ _ _ _ _