ML18030A048

Interim Deficiency Rept Re Lack of Required Special Conduit Separation for Certain safety-related Electrical Circuits, Initially Reported on 810408.Safety-related Electrical Circuits Will Be Correctly Separated

ML18030A048
Person / Time
Site:	Susquehanna
Issue date:	06/05/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, PLA-827, NUDOCS 8106090406
Download: ML18030A048 (6)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM. (RIDS)

ACCESSION NBR:8106090406 DOC ~ DATE! 81/06/05 NOTARIZED: NO DOCKE.T' FACIL:50 387 Susquehanna Steam Electrf c Stations Unf t 1 > Pennsyl va 0500~087 50 388 Susquehanna Steam Electr f c Statf one Unf t 2'P Pennsyl va 05 'I)038 AUTH',NAME AUTHOR AFFILIATTON CURTIS N ~ W ~

E Pennsyl vanf a Power L Lf ght Co ~

RECIP ~ NAMEl RECIPIENT AFFILIATION GRIERiB ~ H ~ Region ii Phfladelphfar Office'f the Director (81/03/01)

SUBJECT:

Interim deficiency rept re lack of required special conduit separation for certain- safety>>rel'ated electrical cfrcuftsr fnftfally r epor'ted on 810408 Safety related electrical circuits will be correctly separated, DISTRIBUTION CODE':: BOI9S'OPIES RECEIVEDiLTR ~NCI./ SIZE TITLE,: Construction Deficiency Report (10CFR50 55K) ~

NOTES!Send IEE 3 copfes FSAR 5 al 1 amends,1 cytBWR>>LRG PM(L RIB') 05000387 Send IEE 3 copies FSAR 8 all amends,i cy:BWR~LRG PM(L ~ RIB) 05000388 RECIPIENT COPIES' RECIPIENT'D COPIES ID'ODE/NAMEI TTR'NCL CODE/NAME" LTTR'NCI.

ACTION: A/D LICENSNG 04 1 1 LIC BR ¹2'C 05 1 1 LIC BR ¹2 LA 06 1 1 STARKERS 07 1 1 INTERNAL'SLBP/J',HARD 1 D/DIR HUM 1 1 f

FAC15'QUIP EDO 8 STAFF 19 1 1 QUAL BR1 1 1 HYD/GEO BR 1 1 ILE Oo 1 1 22'E/EES 1 1 LIC QUAL'R 1 1 02' 12'RC MPA 20 1 1 PDR i. 1 OELD 21 1 1 REV 13 1 1 QA BR 14 1 1 ,EG FILE 01 1 1 STANDRDS DEY 21 1 1 EXTERNAL: ACRS 1 6. 16 16 LPDR 03 1 1 NSIC 08 1 1 gag 10 1981 TOTAL NUMBER. OF COPIES REQUIRED: LTTR ~$ v'g ENCL

TWO NORTH NINTH STREET, ALLENTOWN, PA. 18101 PHONE~ (215) 7/0-5151 NORMAN W. CURTIS Vice pfesidenl-Engineeting d Construction-Nuclear 770 5381 June 5, 1981 r Mr. Boyce H. Grier Director, Region U. S.

I Nuclear Regulatory Commission

-'(gyes, ',

631 Park Avenue King of Prussia, PA 19406 0r S 1aI C0 SUSQUEHANNA STEAM ELECTRIC STATION FINAL REPORT OF A DEFICIENCY RELATING TO ELECTRICAL SEPARATION ER's 100450/100508 FILES 840-4/900-10 PLA-827

Dear Mr. Grier:

This letter serves to provide the Commission with an interim report of a deficiency involving the lack of required special conduit separation for certain safety-related electrical circuits. The deficiency was originally reported to the NRC iTL General Electric letter TRR-26-81/MPN-065-91, dated April 8, 1981 under the provisions of 10 CFR 21. Recognizing its to review the condition for reportability under 10 CFR 50.55(e), 'esponsibility PP&L determined this deficiency to be potentially reportable. Consequently, Mr. C. Z. McVicker of PPaL so advised NRC Region I Inspector Mr. L. Narrow by telephone on April 14, 1981.

The attachment to this letter contains a desription of the deficiency, its cause, safety implications, and the corrective action taken and planned.

The information is submitted as a final report pursuant to the provisions of 10 CFR 50.55(e).

We trust the Commission will find the information forwarded by this letter to be satisfactory.

Very truly yours, N. W. Curtis yoi~

Vice President-Engineering 6 Construction-Nuclear 5 FLW/WHG/vs'.

PENNSYLVANIA POWER iL LIGHT COMPANY

Mr. Boyce H. Grier cc: Mr. Victor Stello (15)

Director-Office of inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. McDonald, Director (1)

Office of Management Znformation & Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Gary Rhoads U. S. Nuclear Regulatory Commission P. O. Box 52 Shickshinny, PA 18655

. ~

Attachment to PLA-827 SUB JECT Special electrical separation for the G.E. supplied Power Generation Control Complex involving the High Pressure Coolant Injection (HPCX), Reactor Core Isolation Cooling (RCIC), and Automatic Depressurization Systems (ADS) as identified in NRC ZGE Information Notice 79>>32.

DESCRIPTION OF DEFICIENCY The deficiency involves the omission of conduit on electrical wiring to the HPCX inboard steam isolation valve E41-F002 and RCIC inboard steam isolation valve E51-F007. The installation of this condui.t is required to meet a specific requirement of the General Electric specification for electrical separation, applicable to Susquehanna 1 6 2. This deficiency relates to both the GE scope of supply (i.e. the Power Generation Control Complex) and the Bechtel Corp. scope of supply (i.e. Balance of Plant) for these circuits.

Note: Although GE's Part 21 report (ref. TRR-26-81/MFN-065-81 dated 4/8/81) included ADS circuits in the scope of the reported deficiency, as did their generic response to NRC Z&E Information Notice 79-32, ADS has not been included in the scope of thi.s report because the Susquehanna ADS design, unlike earlier vintage plants, has two redundant power and logic trains and is capable of operation with a failure in either division.

CAUSE The General Electric specification for electrical separation applicable to Susquehanna SES, requires that conduit be installed to provide special separation of the HPCZ and RCXC inboard steam line isolation valve circuits from other circuits assigned to the same division (see attached diagram of Fig. 5 of G.E. Doc. 22A3052). The intent, of this special separation require-ment is to provide conduit separation of the "Division I-X" circuit from other Division X circuits and conduits separation of the "Division ZZ-X" circuits from other Division ZI circuits thereby preventing a postulated single electrical failure from disabling both the HPCX and RCXC systems. GE and Bechtel Corp.,

for their respective scopes of supply, failed to incorporate this special electrical separation requirement into the design output documents they prepared and issued for the manufacture and construction of the Susquehanna HPCZ and RCZC systems.

ANALYSIS OF SAFETY IMPLICATIONS The intent of the GE requirement for special separation using conduit on the subject HPCX and RCIC circuits was to prevent a postulated single electrical failure from disabling both the HPCX and RCIC systems. There is a possibility that a fire could cause a hot-short circuit in the cable to the HPCX inboard isolation valve (Division I) resulting in the closure of this valve and at the same time, disabling the RCZC system which is essentially a Division X system.

This scenario could'result in a loss of capability in both the HPCX and RCIC Page 1 of 2

Attachment to PLA-827 systems. The RCIC system is designed to provide Reactor Makeup Water during a loss of offsite power and to establish and maintain reactor water level during shutdown conditions. Although the ADS would still be available in the event of RCIC 'system failure, it is not the intended function of the ADS to be used as a backup to RCIC during a reactor shutdown. At Susquehanna, the ADS is provided with two redundant power and logic trains and would always be available for a loss of a single division. Therefore, no deficiency exists in the ADS design. This has been confirmed through discussions with GE in May, 1981. PPGL has determined, however, that the lack of installed conduit to provide separation for the electrical circuits to the HPCI and RCIC inboard isolation valves does represent a significant. deficiency in final design as released for construction and is therefore reportable under 10 CFR 50.55(e) .

CORRECTIVE ACTION G.E. site personnel have written Field Deviation Disposition Requests (FDDR-522-12 and FDDR-KRX-542-9) to enclose the circuits for valve E41-F002 from panel H12P617 to the PGCC termination cabinet and the circuits for valve E51-F007 from panel H12P617 to the termination cabinet in flexible conduit.

Bechtel has issued Design Change Package (DCP) 308.1 to the field for the rework required to enclose the remainder of the HPCI and RCXC inboard valve control circuits in conduit.

The Bechtel and GE design documents identified above will provide the direction to install the conduit necessary to achieve compliance with the cited special separation recpxirement for'he HPCX and RCIC systems.

Page 2 of 2

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