ML18030A294

Responds to NRC Concern Re Util Degraded Grid Voltage Protection Described in Revised Response to FSAR Question 40.6.Equipment Damage Will Not Occur for Degraded Voltages Between 65% & 75% for Duration of 10-s

ML18030A294
Person / Time
Site:	Susquehanna
Issue date:	05/26/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
PLA-816, NUDOCS 8106010287
Download: ML18030A294 (2)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIOS)

SUBJECT:

Responds to NRC concern re util degraded grid voltage protection described in revised response to FSAR Question 40 'iKquipment damage will not occur for degraded voltages between 65K 8

75X for duration of 10 st DISTRIBUTION COOK'001S COPIES RECEIVED:LTR t

ENCL 0 TITLE: PSAR/FSAR AMOTS and Rel ated Cor'respondence SIZE:

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NOTES:Send I8E 3 copi es FSAR 8 al 1

amends, 1 cy.'BilR LRG PM(L ~ RIB)

Send I8E 3 copies FSAR 8 al 1

amends

~ 1 cy:BNR LRG PM(L RIB)

ACCESSION NBR:8106010287 DOC DATE: 81/05/26 NOTARIZED:

NO FACIL:50 387 Susquehanna Steam Electric Station<

Unit 1< Pennsylva 50 388 Susquehanna Steam Electric Stations Unit 2r Pennsylva AUTH BYNAME AUTHOR AFFILIATION CURTISrR ~ J ~

Pennsylvania Power 8, Light Co ~

RECIP ~ NAME RECIPIENT AFFILIATION YOUNGBLOODiB.J, Licensing Branch 1

DOCKET rI 05 00387

'KEO 0 05000387 05000388 RECIPIENT ID CODE/NAME'CTION:

A/D LICENSNG RUSHBROOKiM ~

COPIES RECIPIENT LTTR KN L IO CODE/NAME

.1 LIC BR ~2 BC 1

STARKeR ~

04 COPIES LTTR ENC 1

1 INTERNAL: ACCID KVAL BR26 CHEM ENG BR 08 CORE PERF BR 10 EMERG PREP 22 EMRG PRP LIC FK:"A REP OI V HUM FACT KNG RR I8C SYS BR 16 LIC GUID BR MATL ENG BR 17 MPA OELD POWER SYS BR 19 QA BR 21 REAC SYS BR 23-SIT ANAL BR 24 1

1 1

1 3

1 1

1 1

1 1

1 1

0 1

0 1

1 1

1 1

1 1

1 AUX SYS BR 07 CONT SYS BR 09 EFF TR SYS BR12 EMRG PRP OEV EQUIP QUAL BR 13 GEOSC IKNCES 14 HYO/GEO BR 15 I8K 06 LIC QUAL BR "iECH KNG BR 18 NRC PDR 02 OP LIC BR PROC/TST REV 20 R

ESS BR22 RE~GLI5 01 ERUCT ENG BR25 EXTERNAL; ACRS NSIC 27 05 16 1

1 LPOR 03 ggN gg %san 0

TOTAL NUMBER OF COPIES REQUIRKDC LTTR

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ENCL

, TWO NORTH NINTH STREET, ALLENTOWN, PA.

18101 PHONE (215) 821-5151 II NORMAN W. CURTIS Vice President. Engineering & Construction 821-5381 MN 26 1881

,'" affj(Q IrIAQ Q gtgg~ ~

LIekt~ R t

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Mr. B. J. Youngblood, Chief Licensing Branch No.

1 U.S. Nuclear Regulatory, Commission Washington, D.C.

20555 SUSQUEHANNA STEAM ELECTRIC STATION SER OUTSTANDING ISSUE NO. 49 ER 100450 FILE 841-2 PLA-816

Dear Mr. Youngblood:

This letter responds to the NRC concern on Susquehanna's degraded grid voltage protection described in our revised response to FSAR question 40.6.

The revised 40.6 response was submitted to close SER open item 849.

The NRC concern, as PP6L understands it, relates to the damaging effects on class 1E equipment from degraded voltages between 65% and 75% existing for the '10 second time delay setting of the voltage protection relays.

PPSL has reviewed Susquehanna's class 1E equipment and has determined that equipment damage will not occur for degraded voltages between 65% and 75% for a duration of 10 seconds.

Very truly yours, N. W. Curtis Vice President-Engineering

& Construction-Nuclear WEB/mks cc:

R.

M. Stark - USNRC 8106010PV PENNSYLVANIA POWER 8

LIGHT COMPANY grrd

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