ML19345A543

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RO 50-29/75-18:on 751215,during Core 12 Zero Power Physics Testing,Intermediate Range Detector Transposed to Ni Channel 3.Caused by Exchanging of Negative & Positive Leads Extending to Detector.Leads Reconnected Per Design
ML19345A543
Person / Time
Site: Yankee Rowe
Issue date: 01/14/1976
From: Boutwell R
YANKEE ATOMIC ELECTRIC CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345A540 List:
References
RO-50-29-75-18, NUDOCS 8011240155
Download: ML19345A543 (3)


Text

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NAME LCENSE NUMBER l ?.!l AlY lK l R l 1 l l 0 l 0l-l0 l0 l 0 l 0 l 0l-l 0l 0l l4 l1 l1 l1 l1 l l0l1l Y

o1 7 89 14 15 25 26 30 31 32 s$N3 CATE00RY Ty p DOCKET NUMBER EVENT CATE REPORT DATE 01 cCNT l l

l y lLl l 015101-l 0l0 l 2 l 9 l l 1l 2l1 l5 l7 l5 l l 011l ll 417 l6 l 7 8 57 SS 59 60 61 68 69 74 75 80 EVEN7 DESCRIPTION

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PswE 80 svSTEu CAUSE COMPONENT CCMAONENT 0001 CODE COVPCNENT CODE SU8MER MANUFACTUAER VOLAT 10N

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12 17 43 44 47 48 CA'JSE DESCR;PTION lTne inspection of Ch. 5 cabling re ealed that the negative and positive leads extendind aE 7 89

@ Ifren the NI panel to the detector had been exchanced.

The leads were r6 connected as 80 7 89 l

W ldesicled ~ nd operationally tested satisfactorily.

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l 7 89 sA;p METHCQ OF 5'A*;S

% PCWER CTMER STATUS DISCOVERY OtSOOVERY DESCRIPTON l' l l0l0l0i l XA 1 W l Troubleshooting Reactivity Computer l

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,o EET DESCRIPTION:

During Core XII B.O.L. Zero Power Physics Testing the Intemediate Range detector, Ch. 5 CIC normally connected to the input of the Reactivity Computer for Physics Testing was tranp; sed to NI Ch. 3.

hhen the reactor was taken critical and power r'ised into the inter-cediate range, the operator noted that NI Ch. 3 had a negative SUR and a decreasing level signal. The reactor was tripped and an in-vestigatica initiated. A redundant channel, NI Ch. 4 was available and operable.

Therefore, had a condition requiring the SUR trip of the intermediate range channel occurred Ch. 4 would have functioned as designed with a resulting reactor trip signal.

This event is being reported in accordance with Technical Specification, Section E.2.b.2 and is repcrted as Reportable Occurrence 50-29/75-18.

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NHC( dTRIBUTION FOR PART 50 DOCI:(.AATERI AL' (TEMPORARY FOPM)

CONTROL NO:. 5 8 Y FILE: lucr:rmr rILF.

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t'ankee Atomic Elde Co DATE OF DOC DATE REC'D LTR TWX RPT OTHER Rowe, Mass H A Autio 1 - U.7_e 1-20-76 XXX TO:

CRIG CC OTHER SENT URC PDR vv Mr O'Reilly none signed SENT LOCAL POR__ _XX CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

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50-29 DESCRIPTION:

ENCLOSURES:

trans the following:

License Event,Rpport #75-18 on 12-15-75 concerning failure of the inter =cdiate range detectee...........

PLANT NAME: Yankee Rowe FOR ACTION /INFC EI.1ATION 1-21-76 ehf

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