ML18019A853

SER Confirmatory Item No. 34 Undervoltage Protection

ML18019A853
Person / Time
Site:	Perry
Issue date:	08/26/1982
From:	Davidson D Cleveland Electric Illuminating Co
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8208310416
Download: ML18019A853 (1)

Text

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• MUMINATING BLDG* ** \\,s ~ueL.ic souAAE serving iheBe:t Location,n ;he ;~tion.*

. [)alwyn R. Oavidton.

V1Ct PRESIDE.NT.*.

• ,. SVSl[M (NGIN[!:RING AND GONST~UCllON Mr. A. Schwencer, Chief Lkensing Branch No. 2 Division of Licensing

• U. s.. Nuclear* Regulatory Commission Washington, o*. c.

20jj.5

Dear Mr. Schwencer:

August 26, i 9*2

• Perry Nuclear Power Plant_

Docket Nos..S0".'440; )0-lflf I SER Confirmatory Item - No. 3t, Undervoltaae Protection The foUowing *information as provided to amend. our June 8,.1912, letter regarding SER Confirmatory Item No. llf on undervoltage pro~ection. (Ref, FSAR question 430.77).

• In an effort.to optimize the design of the Class IE undervoltage protection scheme, we have further analyzed our system design. This review has identified some refinements in the design which will necessitate the following changes to our

<>r iginal response..

To avoid tripping t.he off site breakers during normillload. sequencing, the setpoint for the first level of undervoltage protection has been changed to trip at 7.5%.

of motor rated voltage instead of 86%. The three second fixed time. delay will still remain in* effect~

Additionally, the diesel generator start signal after the U second time deJay from the second level of undervoltage has been eliminated. In order to prevent

. unnecessary engine starts, this timer wiU alarm only, allowing operator initiation if the diesels are needed.

The undervohage protection* will not be bypc1ssed duri~g load.seqliertcing operat~ons *

.The setpoint.values have been selected fo prevent tripping of safety bus~s during sequencing operations.

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. A~ust *2~. 1,12 Undervoltag~. Prot~tion *

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• . *_ ra,e,.,*,ched iketches~re prova~ toc:~aritft~. '*'c: for* typicaa,b,~~ ~*~o.tage

• protection sd1em~, :..

• A~ 'stated in. o~ June I. letter, the final design~~ *,etpoi~ts w.i~I :a.e *established *.

after a review of our onsite preoperational*test results~.Any* cha,:iges to this*

. design would'be reviewed* with the staff *prior to.*impl4ementation.

DRO:mb cc: Jay Silberg, Esq.

• John Stefano

• Max Gildner s.* Rhow Vetf-t~idy yours~

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