ML19309D802

AO 50-313/75-04:on 750707,makeup Pump P36C Tripped When Started During Normal Operation.Caused by Communications Failure Between Operators.Pump Inspected.Frozen Number 1 Impeller & Wear Ring Will Be Repaired

ML19309D802
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/16/1975
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19309D789	List: ML19309D787 ML19309D802
References
NUDOCS 8004110678
Download: ML19309D802 (4)

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.- . LICENSEE EVENT REPOclT CONTROL BLOCK:l l 1 1 I I I (PLEASE PRINT ALL REQUIRED INFORMATION) 1 8 NAME LCENSE NUMBFR YE TYPE 1

1 A I R l A l R.l K l l l lo lo l-lo lol clo Iol-lol oj l4lIl/l1l/l lC l / l 7 89 14 15 25 26 30 31 32 CATEGORY Tp SO COCKET NUMBER EVENT CATE REPORT OATE 01 COtrT I P l ol 7 8 57 58 LIJ 59 M60 1015101-1o 61 131i 1.s_1 68 lo l11o l7171sl 1o171/16171sl 69 74 75 80 EVENT OESCRIPTION HE IDurie normal noua4/on at 7 89 '

IMo heues. 9%c maks,,a co ns , to as I 80 SE I sh ar+e.d and i m m e Maie.tv +ci o p e.d . Pu m a was Eco xe rt. Redondanf I 7 89 ' '

80

• EE 19um os 7 89 9 3t A and P%B w ere no g' r a ble. No o ce v /n us '

failures l B0

@ lo s '+hk +v a 7 89 Po m o d ts ass a ns b la d and inno ce.4 a4 R e os'i rs I a d ,. , [66, g3/73 4) 80 Q l td ({ be 7 89

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pnu, 80 EE CODE COMPONENT CODE A M AC R VOLATCN

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7 89 10 1910 iml p l x l x l 12 17

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11 43 44 47 48 CAUSE DESCRIPTION

@ l Fu m o had been allonel he n s4andby and was con for apeoxi-l 7 89 '

80 DE lmaMv 7 89

/c minu4es a4 1037 hours0.012 days <br />0.288 hours <br />0.00171 weeks <br />3.945785e-4 months <br /> o;ML 4hd alhnment i. e. no suc4?on. l 80 lSvren h kson 4echen4al dno ble beacino com o T'v ce bvmx Serie f B/o. I

1. 8 9 Qf,tj DDis5.

STATUS heed Sot ~ prope.r c.cmtnughgfigr% M resied.

% POWER OTHER STATUS 80 ..

DISCOVERY O1SCOVERY OESCRIPTON i

7 8 l.nJ 9 10 lol4131 I NA I La.J l uA l 12 13 44 45 46 80 RELE SEO OF EL ASE AMOUNT OF AC:WITY LOCATON OF RELEASE BE lzj LZJ l .n A l l NA 7 8 9 l 10 11 44 45 80 -

3 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON H lololol LIJ l NA I i 7 89 11 12 13 80 PERSONNEL INJURIES NUMBE R DESCROTON 3E lololol 7 89 l NA I 11 12 80 -

OFFSITE CONSEQUENCES Ml NA l 7 89 80 LOSS OR DAMAGE TO FACILITY

• TYPE DESCRWTON DE LZJ l ITA l 7 89 10 80 PUBLICITY 1

l NA i 7 89 80 ACOITIONAL FACTORS I il NA I

,j 9 80 8I 7 89 Rond110b77 1 80 ~

NAME: h a n$ CLl N_ l 1)I dia Rs PHONE: b 0l U l- N I9 2.

GPO 889 647

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, ,, 1. - Abnormal Occurrence Report No. 50-313/75-4 i

, 2. Report Date: July 16, 1975 3. Occurrence Date: July 7, 1975 i

4 Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification of Occurrence:

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-(P36C) "C" Makeup Pump Failure i

A, -

6. Conditions Prior to Occurrence: ""

Steady-State Power X Reactor Power 2421 MWth Ibt Standby Net Output 772 MWe i

Cold Shutdown Percent of Full Power 93

• Refueling Shutdown Load Changes During Routine

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. Power Operation g Routine Startup .*

-. J Operation '-

Routine Shutdown Operation Other (specify) i 5

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7. Description of Occurrence:

On July 7, 1975, at 1340 hours0.0155 days <br />0.372 hours <br />0.00222 weeks <br />5.0987e-4 months <br />, P36C makeup pump was started to increase level in "A" core flood tank to-clear level alarm. Pump immediately tripped. Investigation revealed that pump was frozen. The pump had been aligned for ES standby and was rur, for approximately 6 minutes at -

1037 hours0.012 days <br />0.288 hours <br />0.00171 weeks <br />3.945785e-4 months <br /> that date with no problems noted, but it was found during -

the investigation that the pump did not have a suction during the six -

(6) minute run. At 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> July 7, 1975, P36A makeup pump was aligned for ES standby with P36B pump in normal . makeup.

O Shrch 4, 1975 NSP-10, Rev. 2 Page 2' of 4

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l Abnormal Occurrence Iteport No. 50-313/75-4 ff li

8. Designation of Apparent Cause of Occurrence:

! Design Procedure 4

Manufacture Unusual Service Condition

Including Environmental

Installation /

! Construction Component Failuro Operator X-Other (specify) i t

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~ 9. Analysis of Occurrence: -

No-safety implications were involved and there was no effect on public health and safety. P36A and P36B were operable.

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Mar'ch 4,.1975 NSP-10, Rev. 2 Page 3 Of 4 4

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.j . Abnormal Occurrence Report No. 50-313/75-4 l .

10. ' Corrective Action:

l P36C pump was disassembled and inspected. Number 1 impeller and wear e

ring were frozen; repairs will be made to the pump.

This occurrence was discussed with all operators and the need for proper communications was stressed.

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11.- Failure Data: .

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d J There have been no previous failures of this type. The failed component -

identification is as follows:

Byron Jackson,' Hori:ontal double bearing pump, Type DVMX, Serial Number 691N0065.

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4 J y k March 4, 1975

NSP-10, Rev. 2 Page 4 of 4 4

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