ML18030A256

Responds to NRC Concerns Re Electrical Isolation Designs for Circuits 85,86,89 & 103 in FSAR Table 8.1-2.Agrees to Accept One of Suggested Options to Resolve Isolation for Circuits 85 & 86.Remaining Circuits Are Being Evaluated

ML18030A256
Person / Time
Site:	Susquehanna
Issue date:	04/15/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
PLA-703, NUDOCS 8104170431
Download: ML18030A256 (3)

Text

ACCESSION NbR:8104170431 OUC ~ DATE: 81/04/15 NOTARIZED'O DOCKET rACIL:50-3'"7 Susquehanna Steam Electric Station~ Unit 1I "ennsylva p%000387 50 388 Susquehanna Steam Flectric Station~ iJni c 2g Pennsylva vvv4 A U Tri ~ iN A HE AIJTHOR AFFILlATIO~

CURT I S i N '~

~ ~ Pennsylvania Power 8, Light Co.

RE,C I P ~ TAHE <ECIP<tl'I err j,LiAi ION YOUNGBLOODiB.J. Licensing Branch 1

SUBJECT:

Responds to NHC concerns re electrical isolation designs for Circuits 85,Boio9 ~ 103 in rSAR Tavle o 1"2 'grees to accop

~

one of sugqesteu options to resolve isolation for Circuits 85 8 86.Remaining circuit." are being evaluated, DISTRIBUTION CODE: B001S COPIES RECEIYED:LTR ENCL SIZE:

TITLE: PSAR/FSAR AHOTS and Related Correspondence NOTES:Send IKE 3 copies FSAR 8 all amends. 0500038m Send IEE 3 copies FSAR 8, all amends. 05000388 RECIPIENT COPIES RECIPIENT ,COPIES ID CODE/NAME L.TTR ENC ID CODE/NAHE LTTR ENC ACTION; A/D LICENSNG 1 YOUNGBLOODeB 1 RUSHBROOKpM ~ 1 STARKrR ~ 04 INTERNAL: ACCID EYAL BR26 AUX SYS BR 07 CHEM ENG BR 08 CONT SYS BR 09 CORE PERF BR 10 EFF TR SYS BR12 EHERG PREP 22 FAUlP QUAL BR13 GEOSC IENCES 14 HUH FACT ENG BP HYD/GEO BR 15 IS,C SYS BR 16 I8E 06 LIC GUID BR LIC QUAL BR MATL ENG BR 17 HECH ENG BR 18 HPA NRC PDR 02 OELD OP LIC BR POWER SYS BR 19 PROC/TST REY 20 QA BR 21 RA~0 BESS BR22 REAC SYS BR 23 86~+

S CT'NG 01 BR25 SIT ANAI. BR SYS INTERAC BR 24 EXTERNAL'CRS NSIC 05'6 27 1

1 LPDR 03 TOTAL NUMBER OF COPIES REQUIRED: LTTR 57 ENCL

TWO NORTH NINTH STREET, ALLENTOWN, PA. 18101 PHONEr (215) 770 5151 NORMAN W. CURTIS Vice presidenr. Engineering 8 Constrccrion-Ncc!ear 770 5381 April 15, 1981 Mr. B. J. Youngblood, Chief Licensing Projects Branch 81 Division of Project and Management U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Susquehanna Steam Electric Station Docket Nos. 50-387 and 50-388 Non-Class IE Loads on Class IE power System ER 100450 File 841-2 PLA-703

Dear Mr. Youngblood:

Pennsylvania Power and Light Co. has reviewed the NRC's concerns relative to the electrical isolation designs for circuits 85, 86, 89 and 103 in table 8.1-2 of the FSAR. We agree to accept one of the three suggested options to resolve isolation for circuits 85 and 86, PP8L is evaluating circuits 89 and 103 to determine if they should be reclassified as class 1E. If not feasible, PP8L will apply one of thefollows: three options to provide acceptable isolation. These options are as

1) The addition of another circuit breaker fully coordinated with the existing breaker and periodically tested for verification.

2) the use of a safety injection actuation signal to automatically 'trip the load.

3) the use of a shunt trip device, for the breaker such that this trip would not be subject to the direct thermal and magnetic effects of any large magnitude (e.g.,

short circuit) fault current.

PENNSYLVANIA POWER 8 LIGHT COMPANY 8104170481

B. J. Youngblood, Chief April 15, 1981 Page two The modified design ~chill be installed prior to fuel load.

Very truly yours, N. W. Curtis Yice President-Engineering and construction-Nuclear cc: R. H. Stark bcc: N. W. Curtis W. E. Barberich

8. A. Snapp C. T. Coddington R. J. Shovlin