ML17321A338

Forwards Rev a to Nuclear Environ Qualification Test Rept on Agastat E7000 Series Timing Relays, Per NRC Nov 1984 Request for Addl Info Re Mercoid Pressure Switches,Agastat Relays & GE Relays

ML17321A338
Person / Time
Site:	Cook
Issue date:	12/07/1984
From:	Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML17321A339	List: ML17321A338 ML17321A340
References
AEP:NRC:0001E, AEP:NRC:1E, NUDOCS 8412120237
Download: ML17321A338 (7)

Text

I REGULATOR), INFORMATION OISTRISUTION ITEM (RIOS)

ACCESSION NBR; 8012120237, DOC+ DATE e 8'/12/07 NOTARIZED:- YES DOCKET FACIL:50 315 Donald C ~

'Cook Nuclear power PlantE Un) t 1F Ihdiana L 050003)5 50 316 Donald C ~ Cook Nuclear power PlantF Unit 2E Indiana R 05000316 AUTH, NAME,. I AUTHOR AF F IL ATION ALEXICHiM+P~ Indiana 8 Michigan Electric Co, RECIP,NAME RECIPIENT AFFILIATION DENTONgH ~ RE Office of Nuclear Reactor Regulations Director

SUBJECT:

Forwards Rev A to "Nuclear Environ Qualification Test Rept on Agastat E7000 Ser ies Timing Relaysi" per NRC Nov 1980 request foI addi info re'ercoid pressure, switches~Agastat relays 5, GE relays, DISTRIBUTION CODE! A001D COPIES RECEI)ED LTR ENCL SIZE!

TITLE: OR Submittal-: General Distribution NOTES: S&R ++

OL t 10/25/74 At ~+~M 05000315 05000316 OL ~ 12/23/72 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME- LTTR ENCL ID CODE/NAME LTTR ENCL NRR ORB1 BC 01 7 7 INTERNAL: ACRS 09 6 ADM/LFMB 1 0 ELD/HDS3 1 0 NRR/DE/MTEB 1 NRR/DL DIR 1 1 NRR/DL/DRAB 1 0 ETB 1 NRR/DSI/RA 8 1 REG FI 1 1 RGN3 1 1 EXTERNAL: LPDR 03 2 2 NRC PDR 02 NSIC 05 1 1 NTIS TOTAL NUMBER OF COPIES REQUIRED;'TTR 27 ENCL 20

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INDIANA 8 MICHIGAN ELECTRIC COMPANY P,O. BOX 16631 COLUMBUS, OHIO 43216 December 7, 1984 AEP:NRC:0001E Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 REQUEST FOR ADDITIONAL INFORMATION Mr. Harold R. Denton, Director Off1ce of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington D. C. 20555

Dear Mr. Denton:

This letter and its attachment transmit the additional 1nformation requested in a telephone conversation with members of your staff in November 1984, concerning Mercoid Pressure Switches, Agastat Relays and GE Relays.

The report on the functionality testing of the Agastat relays for se1smic loads is included as Attaohment No. 1 to this letter.

The Mercoid pressure switohes in safety related systems are being changed in both mild and harsh environments. The only harsh environment that any Mercoid pressure switch is subject to is the steam environment, due to a steam line break. The replacement switch is qualified for that environment. As stated in our letter of June 1, 1984, AEP:NRC:0001D, the schedule for completion of replacement of all safety r elated Mercoid pressure switches in both units is the end of the next Unit 2 refueling outage which is currently scheduled to begin in November, 1985.

I The comparison between the E7000 series and the 7000 series relay was made by comparing a Model E7012SD relay with a new model 7012SD relay and a 7012SD relay which had been removed from service. The overall physical dimensions and center of gr avity were determined by measurement of the assembled relays. The relays were then disassembled and measurements made of the dimensions and weight of each significant piece of each relay and the spring constant of internal springs was determined by deflect1on. No differences were detected between relays. The only differences between relays detected was the weight of the stationary contact block (a non moving part). The difference in weight was attributed to the elimination of asbestos as a filler material in the plastic molded material and deemed to have no effect on the static or dynamic performance of the relay.

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Mr. Harold R. Denton AEP:NRC:0001E The test specification for the Agastat Relays was sent with the letter of June 1, 1984 in answer to the question in your letter of February 21, 1984, concerning the functionality testing of the relays during seismic tests. A copy of the test report which includes the test specification is included as Attachment 1 to this letter. This report has been approved and accepted by the Electrical Cognizant Engineer and is included in answer to comments made concerning the specification previously submitted.

The seismic test of the Agastat relays was a fragility test of the relay itself and was performed by the manufacturer of the relay. The relay was mounted on a rigid fixture and the seismic levels determined for the relay by determining the acceleration level necessary to cause contact malfunction as defined in the test specification. Only E7012 and E7022 relays are used in the safety systems at D. C. Cook Plant; E7014 and E7024 relays also described in this test repor t are not used. The required response spectrum (RRS) for each location where Agastat relays are located in safety related systems has been compared to the lowest test response spectrum (TRS) of the three provided in the report (operate, non-operate, and transition) and determined that the TRS envelopes the RRS.

The test report for the General Electric Model 12PJC11AV1A has been reviewed. No anamolies were identified in the report.

This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accur acy and completeness prior to signature by the undersigned.

Very truly yours, M. P. A xich g~

Vice President Y,~($ <

cm Attachment cc: John E. Dolan (w/o attachment)

W. G. Smith, Jr. - Bridgman (w/o attachment)

R. C. Callen (w/o attachment)

G. Bruchmann (w/o attachment)

G. Charnoff (w/o attachment)

NRC Resident Inspector - Bridgman (w/o attachment)

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ATTACHMENT TO

'EP NRC 0001E