ML18219C157

Response to December 19, 1977 Letter Which Transmitted IE Bulletin No. 77-07

ML18219C157
Person / Time
Site:	Cook
Issue date:	01/31/1978
From:	Dolan J American Electric Power Service Corp
To:	James Keppler NRC/RGN-III
References
IEB-77-007
Download: ML18219C157 (4)

Text

AMERICAN ELECTRIC POWER Service Corporation 2 Broadway, Nao York, N. Y. 10004 (212) 422.4800 JOHN E.DOLAN Senior Ecccuacc Vice Zrcddent Engisrcrisg January 31, 1978 Donald C. Cook Nuclear Plant Unit 2 Docket No, 50 33.'6 DPR NO. 74 and CPPR No. 61 Mr. J. G. Keppler, Regional Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region 799 III Roosevelt Road Glen Ellyn, Illinois 60137

Dear Yw . Keppler:

This 'etter is in response to your letter of December 19, 1977, which transmitted IE Bulletin No. 77-07 to us. The attached enclosure is submitted in fulfillment of thereguirement to respond to this IE Bulletin.

ery truly yours, JED:em John E. Dolan Enclosure CC R. C. Callen G. Charnoff R, W. Steketee R. Walsh R. J. Vollen R. W. Jurgensen D. V. Shaller Bridgman

Donald C, Cook. Nuclear Plant Unit No, 2 Docket No, 50 ~ 316 CPPR No, 61 and DPR No, 24 RESPONSES 'TO IE 'BULLETIN 'N0.77 -'07 1.0 The containment electrical penetrations used at D.C. Cook Nuclear Plant Units 1 and 2 are not manufactured by General Electric and Qo not employ an epoxy sealant to ensure ade-quate functioning of. electrical safety related equipment or to ensure containment leak tightness.

l,l The electrical penetrations used at D.C. Cook Plant are manufactured by'he 'Conax Corporation, The manufacturer does not employ'odel'umbers, The Conax part numbers for -the penetr~tions. used at the D.C. Cook Plant Unit 2 are as follows; Electrical Pe'netratio'n'o. 'Co'n'ax'art No.

EP 1 2325-8396-01 EP-.2 2325-8386-01 EP-3 2325-8386-02 EP-4 2325-8386-03 EP~5 2325-8386-04 EP-6 2325-8386-05 EP-,7 2325-8386-06 EP-8 2325-8386-07 EP-9 2325-8386<<08 EP-10 2325-8386-09 EP-ll 2325-8386-10 EP-3.2 ~ 2325-8386-11 EP-13 2325-8396-12 1.2 The electrical conductors in the electrical penetrations electrical used in-at the D.C. Cook Plant do not employ epoxy for sulation or for leak tightness. There is no embedment of the conductors in epoxy.

2,0 The penetrations were shipped and stored with dry nitrogen under pressure, During a short. perioQ during installation, the penetxations were depressurized to permit installation in the containment sleeve and again when the pressurization connections were being made. The penetrations are maintained at, approximately 15 psig pressure, of dry air after installation.

3.0 There is no need to maintain pressure in the electrical'ene-is trations during a design basis acciQent. Each 'is penetration provided with 2 seals in series, each of which capable of withstanding pressures greater than those generated during a design basis accident, without leaking.

3.0 The penetrgtions wex.'e 'pres'surized with dry nitrogen at 15 psig during enyironmental qualification tests, The penetration was xequired to pass a leak gate test of less than '1 x 10-6 'cc perec'ond of heli~ at 20 psig differ'ential following the environmental pressure qualification test; 3,1 The containment electrical pen'etrations 'are qualified for LOCA environmental conditions by test, 3,2 The measures taken that provide assurance of qualification of the 'pen'etrations are adequate to .satisfy the Commission's regulations: as .ident'.fied in .the question.

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